1 // SPDX-License-Identifier: GPL-2.0-or-later 1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* audit.c -- Auditing support 2 /* audit.c -- Auditing support
3 * Gateway between the kernel (e.g., selinux) 3 * Gateway between the kernel (e.g., selinux) and the user-space audit daemon.
4 * System-call specific features have moved to 4 * System-call specific features have moved to auditsc.c
5 * 5 *
6 * Copyright 2003-2007 Red Hat Inc., Durham, N 6 * Copyright 2003-2007 Red Hat Inc., Durham, North Carolina.
7 * All Rights Reserved. 7 * All Rights Reserved.
8 * 8 *
9 * Written by Rickard E. (Rik) Faith <faith@re 9 * Written by Rickard E. (Rik) Faith <faith@redhat.com>
10 * 10 *
11 * Goals: 1) Integrate fully with Security Mod 11 * Goals: 1) Integrate fully with Security Modules.
12 * 2) Minimal run-time overhead: 12 * 2) Minimal run-time overhead:
13 * a) Minimal when syscall auditing 13 * a) Minimal when syscall auditing is disabled (audit_enable=0).
14 * b) Small when syscall auditing is 14 * b) Small when syscall auditing is enabled and no audit record
15 * is generated (defer as much wo 15 * is generated (defer as much work as possible to record
16 * generation time): 16 * generation time):
17 * i) context is allocated, 17 * i) context is allocated,
18 * ii) names from getname are sto 18 * ii) names from getname are stored without a copy, and
19 * iii) inode information stored 19 * iii) inode information stored from path_lookup.
20 * 3) Ability to disable syscall auditi 20 * 3) Ability to disable syscall auditing at boot time (audit=0).
21 * 4) Usable by other parts of the kern 21 * 4) Usable by other parts of the kernel (if audit_log* is called,
22 * then a syscall record will be gen 22 * then a syscall record will be generated automatically for the
23 * current syscall). 23 * current syscall).
24 * 5) Netlink interface to user-space. 24 * 5) Netlink interface to user-space.
25 * 6) Support low-overhead kernel-based 25 * 6) Support low-overhead kernel-based filtering to minimize the
26 * information that must be passed t 26 * information that must be passed to user-space.
27 * 27 *
28 * Audit userspace, documentation, tests, and 28 * Audit userspace, documentation, tests, and bug/issue trackers:
29 * https://github.com/linux-audit 29 * https://github.com/linux-audit
30 */ 30 */
31 31
32 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 32 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
33 33
34 #include <linux/file.h> 34 #include <linux/file.h>
35 #include <linux/init.h> 35 #include <linux/init.h>
36 #include <linux/types.h> 36 #include <linux/types.h>
37 #include <linux/atomic.h> 37 #include <linux/atomic.h>
38 #include <linux/mm.h> 38 #include <linux/mm.h>
39 #include <linux/export.h> 39 #include <linux/export.h>
40 #include <linux/slab.h> 40 #include <linux/slab.h>
41 #include <linux/err.h> 41 #include <linux/err.h>
42 #include <linux/kthread.h> 42 #include <linux/kthread.h>
43 #include <linux/kernel.h> 43 #include <linux/kernel.h>
44 #include <linux/syscalls.h> 44 #include <linux/syscalls.h>
45 #include <linux/spinlock.h> 45 #include <linux/spinlock.h>
46 #include <linux/rcupdate.h> 46 #include <linux/rcupdate.h>
47 #include <linux/mutex.h> 47 #include <linux/mutex.h>
48 #include <linux/gfp.h> 48 #include <linux/gfp.h>
49 #include <linux/pid.h> 49 #include <linux/pid.h>
50 50
51 #include <linux/audit.h> 51 #include <linux/audit.h>
52 52
53 #include <net/sock.h> 53 #include <net/sock.h>
54 #include <net/netlink.h> 54 #include <net/netlink.h>
55 #include <linux/skbuff.h> 55 #include <linux/skbuff.h>
56 #include <linux/security.h> 56 #include <linux/security.h>
57 #include <linux/freezer.h> 57 #include <linux/freezer.h>
58 #include <linux/pid_namespace.h> 58 #include <linux/pid_namespace.h>
59 #include <net/netns/generic.h> 59 #include <net/netns/generic.h>
60 60
61 #include "audit.h" 61 #include "audit.h"
62 62
63 /* No auditing will take place until audit_ini 63 /* No auditing will take place until audit_initialized == AUDIT_INITIALIZED.
64 * (Initialization happens after skb_init is c 64 * (Initialization happens after skb_init is called.) */
65 #define AUDIT_DISABLED -1 65 #define AUDIT_DISABLED -1
66 #define AUDIT_UNINITIALIZED 0 66 #define AUDIT_UNINITIALIZED 0
67 #define AUDIT_INITIALIZED 1 67 #define AUDIT_INITIALIZED 1
68 static int audit_initialized = AUDIT_UNIN 68 static int audit_initialized = AUDIT_UNINITIALIZED;
69 69
70 u32 audit_enabled = AUDIT_OFF; 70 u32 audit_enabled = AUDIT_OFF;
71 bool audit_ever_enabled = !!AUDIT_O 71 bool audit_ever_enabled = !!AUDIT_OFF;
72 72
73 EXPORT_SYMBOL_GPL(audit_enabled); 73 EXPORT_SYMBOL_GPL(audit_enabled);
74 74
75 /* Default state when kernel boots without any 75 /* Default state when kernel boots without any parameters. */
76 static u32 audit_default = AUDIT_OFF; 76 static u32 audit_default = AUDIT_OFF;
77 77
78 /* If auditing cannot proceed, audit_failure s 78 /* If auditing cannot proceed, audit_failure selects what happens. */
79 static u32 audit_failure = AUDIT_FAIL_PRI 79 static u32 audit_failure = AUDIT_FAIL_PRINTK;
80 80
81 /* private audit network namespace index */ 81 /* private audit network namespace index */
82 static unsigned int audit_net_id; 82 static unsigned int audit_net_id;
83 83
84 /** 84 /**
85 * struct audit_net - audit private network na 85 * struct audit_net - audit private network namespace data
86 * @sk: communication socket 86 * @sk: communication socket
87 */ 87 */
88 struct audit_net { 88 struct audit_net {
89 struct sock *sk; 89 struct sock *sk;
90 }; 90 };
91 91
92 /** 92 /**
93 * struct auditd_connection - kernel/auditd co 93 * struct auditd_connection - kernel/auditd connection state
94 * @pid: auditd PID 94 * @pid: auditd PID
95 * @portid: netlink portid 95 * @portid: netlink portid
96 * @net: the associated network namespace 96 * @net: the associated network namespace
97 * @rcu: RCU head 97 * @rcu: RCU head
98 * 98 *
99 * Description: 99 * Description:
100 * This struct is RCU protected; you must eith 100 * This struct is RCU protected; you must either hold the RCU lock for reading
101 * or the associated spinlock for writing. 101 * or the associated spinlock for writing.
102 */ 102 */
103 struct auditd_connection { 103 struct auditd_connection {
104 struct pid *pid; 104 struct pid *pid;
105 u32 portid; 105 u32 portid;
106 struct net *net; 106 struct net *net;
107 struct rcu_head rcu; 107 struct rcu_head rcu;
108 }; 108 };
109 static struct auditd_connection __rcu *auditd_ 109 static struct auditd_connection __rcu *auditd_conn;
110 static DEFINE_SPINLOCK(auditd_conn_lock); 110 static DEFINE_SPINLOCK(auditd_conn_lock);
111 111
112 /* If audit_rate_limit is non-zero, limit the 112 /* If audit_rate_limit is non-zero, limit the rate of sending audit records
113 * to that number per second. This prevents D 113 * to that number per second. This prevents DoS attacks, but results in
114 * audit records being dropped. */ 114 * audit records being dropped. */
115 static u32 audit_rate_limit; 115 static u32 audit_rate_limit;
116 116
117 /* Number of outstanding audit_buffers allowed 117 /* Number of outstanding audit_buffers allowed.
118 * When set to zero, this means unlimited. */ 118 * When set to zero, this means unlimited. */
119 static u32 audit_backlog_limit = 64; 119 static u32 audit_backlog_limit = 64;
120 #define AUDIT_BACKLOG_WAIT_TIME (60 * HZ) 120 #define AUDIT_BACKLOG_WAIT_TIME (60 * HZ)
121 static u32 audit_backlog_wait_time = AUDI 121 static u32 audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME;
122 122
123 /* The identity of the user shutting down the 123 /* The identity of the user shutting down the audit system. */
124 static kuid_t audit_sig_uid = INVALI 124 static kuid_t audit_sig_uid = INVALID_UID;
125 static pid_t audit_sig_pid = -1; 125 static pid_t audit_sig_pid = -1;
126 static u32 audit_sig_sid; 126 static u32 audit_sig_sid;
127 127
128 /* Records can be lost in several ways: 128 /* Records can be lost in several ways:
129 0) [suppressed in audit_alloc] 129 0) [suppressed in audit_alloc]
130 1) out of memory in audit_log_start [kmallo 130 1) out of memory in audit_log_start [kmalloc of struct audit_buffer]
131 2) out of memory in audit_log_move [alloc_s 131 2) out of memory in audit_log_move [alloc_skb]
132 3) suppressed due to audit_rate_limit 132 3) suppressed due to audit_rate_limit
133 4) suppressed due to audit_backlog_limit 133 4) suppressed due to audit_backlog_limit
134 */ 134 */
135 static atomic_t audit_lost = ATOMIC_INIT(0); 135 static atomic_t audit_lost = ATOMIC_INIT(0);
136 136
137 /* Monotonically increasing sum of time the ke 137 /* Monotonically increasing sum of time the kernel has spent
138 * waiting while the backlog limit is exceeded 138 * waiting while the backlog limit is exceeded.
139 */ 139 */
140 static atomic_t audit_backlog_wait_time_actual 140 static atomic_t audit_backlog_wait_time_actual = ATOMIC_INIT(0);
141 141
142 /* Hash for inode-based rules */ 142 /* Hash for inode-based rules */
143 struct list_head audit_inode_hash[AUDIT_INODE_ 143 struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
144 144
145 static struct kmem_cache *audit_buffer_cache; 145 static struct kmem_cache *audit_buffer_cache;
146 146
147 /* queue msgs to send via kauditd_task */ 147 /* queue msgs to send via kauditd_task */
148 static struct sk_buff_head audit_queue; 148 static struct sk_buff_head audit_queue;
149 /* queue msgs due to temporary unicast send pr 149 /* queue msgs due to temporary unicast send problems */
150 static struct sk_buff_head audit_retry_queue; 150 static struct sk_buff_head audit_retry_queue;
151 /* queue msgs waiting for new auditd connectio 151 /* queue msgs waiting for new auditd connection */
152 static struct sk_buff_head audit_hold_queue; 152 static struct sk_buff_head audit_hold_queue;
153 153
154 /* queue servicing thread */ 154 /* queue servicing thread */
155 static struct task_struct *kauditd_task; 155 static struct task_struct *kauditd_task;
156 static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait); 156 static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait);
157 157
158 /* waitqueue for callers who are blocked on th 158 /* waitqueue for callers who are blocked on the audit backlog */
159 static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_w 159 static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait);
160 160
161 static struct audit_features af = {.vers = AUD 161 static struct audit_features af = {.vers = AUDIT_FEATURE_VERSION,
162 .mask = -1, 162 .mask = -1,
163 .features = 163 .features = 0,
164 .lock = 0,} 164 .lock = 0,};
165 165
166 static char *audit_feature_names[2] = { 166 static char *audit_feature_names[2] = {
167 "only_unset_loginuid", 167 "only_unset_loginuid",
168 "loginuid_immutable", 168 "loginuid_immutable",
169 }; 169 };
170 170
171 /** 171 /**
172 * struct audit_ctl_mutex - serialize requests 172 * struct audit_ctl_mutex - serialize requests from userspace
173 * @lock: the mutex used for locking 173 * @lock: the mutex used for locking
174 * @owner: the task which owns the lock 174 * @owner: the task which owns the lock
175 * 175 *
176 * Description: 176 * Description:
177 * This is the lock struct used to ensure we o 177 * This is the lock struct used to ensure we only process userspace requests
178 * in an orderly fashion. We can't simply use 178 * in an orderly fashion. We can't simply use a mutex/lock here because we
179 * need to track lock ownership so we don't en 179 * need to track lock ownership so we don't end up blocking the lock owner in
180 * audit_log_start() or similar. 180 * audit_log_start() or similar.
181 */ 181 */
182 static struct audit_ctl_mutex { 182 static struct audit_ctl_mutex {
183 struct mutex lock; 183 struct mutex lock;
184 void *owner; 184 void *owner;
185 } audit_cmd_mutex; 185 } audit_cmd_mutex;
186 186
187 /* AUDIT_BUFSIZ is the size of the temporary b 187 /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting
188 * audit records. Since printk uses a 1024 by 188 * audit records. Since printk uses a 1024 byte buffer, this buffer
189 * should be at least that large. */ 189 * should be at least that large. */
190 #define AUDIT_BUFSIZ 1024 190 #define AUDIT_BUFSIZ 1024
191 191
192 /* The audit_buffer is used when formatting an 192 /* The audit_buffer is used when formatting an audit record. The caller
193 * locks briefly to get the record off the fre 193 * locks briefly to get the record off the freelist or to allocate the
194 * buffer, and locks briefly to send the buffe 194 * buffer, and locks briefly to send the buffer to the netlink layer or
195 * to place it on a transmit queue. Multiple 195 * to place it on a transmit queue. Multiple audit_buffers can be in
196 * use simultaneously. */ 196 * use simultaneously. */
197 struct audit_buffer { 197 struct audit_buffer {
198 struct sk_buff *skb; /* for 198 struct sk_buff *skb; /* formatted skb ready to send */
199 struct audit_context *ctx; /* NUL 199 struct audit_context *ctx; /* NULL or associated context */
200 gfp_t gfp_mask; 200 gfp_t gfp_mask;
201 }; 201 };
202 202
203 struct audit_reply { 203 struct audit_reply {
204 __u32 portid; 204 __u32 portid;
205 struct net *net; 205 struct net *net;
206 struct sk_buff *skb; 206 struct sk_buff *skb;
207 }; 207 };
208 208
209 /** 209 /**
210 * auditd_test_task - Check to see if a given 210 * auditd_test_task - Check to see if a given task is an audit daemon
211 * @task: the task to check 211 * @task: the task to check
212 * 212 *
213 * Description: 213 * Description:
214 * Return 1 if the task is a registered audit 214 * Return 1 if the task is a registered audit daemon, 0 otherwise.
215 */ 215 */
216 int auditd_test_task(struct task_struct *task) 216 int auditd_test_task(struct task_struct *task)
217 { 217 {
218 int rc; 218 int rc;
219 struct auditd_connection *ac; 219 struct auditd_connection *ac;
220 220
221 rcu_read_lock(); 221 rcu_read_lock();
222 ac = rcu_dereference(auditd_conn); 222 ac = rcu_dereference(auditd_conn);
223 rc = (ac && ac->pid == task_tgid(task) 223 rc = (ac && ac->pid == task_tgid(task) ? 1 : 0);
224 rcu_read_unlock(); 224 rcu_read_unlock();
225 225
226 return rc; 226 return rc;
227 } 227 }
228 228
229 /** 229 /**
230 * audit_ctl_lock - Take the audit control loc 230 * audit_ctl_lock - Take the audit control lock
231 */ 231 */
232 void audit_ctl_lock(void) 232 void audit_ctl_lock(void)
233 { 233 {
234 mutex_lock(&audit_cmd_mutex.lock); 234 mutex_lock(&audit_cmd_mutex.lock);
235 audit_cmd_mutex.owner = current; 235 audit_cmd_mutex.owner = current;
236 } 236 }
237 237
238 /** 238 /**
239 * audit_ctl_unlock - Drop the audit control l 239 * audit_ctl_unlock - Drop the audit control lock
240 */ 240 */
241 void audit_ctl_unlock(void) 241 void audit_ctl_unlock(void)
242 { 242 {
243 audit_cmd_mutex.owner = NULL; 243 audit_cmd_mutex.owner = NULL;
244 mutex_unlock(&audit_cmd_mutex.lock); 244 mutex_unlock(&audit_cmd_mutex.lock);
245 } 245 }
246 246
247 /** 247 /**
248 * audit_ctl_owner_current - Test to see if th 248 * audit_ctl_owner_current - Test to see if the current task owns the lock
249 * 249 *
250 * Description: 250 * Description:
251 * Return true if the current task owns the au 251 * Return true if the current task owns the audit control lock, false if it
252 * doesn't own the lock. 252 * doesn't own the lock.
253 */ 253 */
254 static bool audit_ctl_owner_current(void) 254 static bool audit_ctl_owner_current(void)
255 { 255 {
256 return (current == audit_cmd_mutex.own 256 return (current == audit_cmd_mutex.owner);
257 } 257 }
258 258
259 /** 259 /**
260 * auditd_pid_vnr - Return the auditd PID rela 260 * auditd_pid_vnr - Return the auditd PID relative to the namespace
261 * 261 *
262 * Description: 262 * Description:
263 * Returns the PID in relation to the namespac 263 * Returns the PID in relation to the namespace, 0 on failure.
264 */ 264 */
265 static pid_t auditd_pid_vnr(void) 265 static pid_t auditd_pid_vnr(void)
266 { 266 {
267 pid_t pid; 267 pid_t pid;
268 const struct auditd_connection *ac; 268 const struct auditd_connection *ac;
269 269
270 rcu_read_lock(); 270 rcu_read_lock();
271 ac = rcu_dereference(auditd_conn); 271 ac = rcu_dereference(auditd_conn);
272 if (!ac || !ac->pid) 272 if (!ac || !ac->pid)
273 pid = 0; 273 pid = 0;
274 else 274 else
275 pid = pid_vnr(ac->pid); 275 pid = pid_vnr(ac->pid);
276 rcu_read_unlock(); 276 rcu_read_unlock();
277 277
278 return pid; 278 return pid;
279 } 279 }
280 280
281 /** 281 /**
282 * audit_get_sk - Return the audit socket for 282 * audit_get_sk - Return the audit socket for the given network namespace
283 * @net: the destination network namespace 283 * @net: the destination network namespace
284 * 284 *
285 * Description: 285 * Description:
286 * Returns the sock pointer if valid, NULL oth 286 * Returns the sock pointer if valid, NULL otherwise. The caller must ensure
287 * that a reference is held for the network na 287 * that a reference is held for the network namespace while the sock is in use.
288 */ 288 */
289 static struct sock *audit_get_sk(const struct 289 static struct sock *audit_get_sk(const struct net *net)
290 { 290 {
291 struct audit_net *aunet; 291 struct audit_net *aunet;
292 292
293 if (!net) 293 if (!net)
294 return NULL; 294 return NULL;
295 295
296 aunet = net_generic(net, audit_net_id) 296 aunet = net_generic(net, audit_net_id);
297 return aunet->sk; 297 return aunet->sk;
298 } 298 }
299 299
300 void audit_panic(const char *message) 300 void audit_panic(const char *message)
301 { 301 {
302 switch (audit_failure) { 302 switch (audit_failure) {
303 case AUDIT_FAIL_SILENT: 303 case AUDIT_FAIL_SILENT:
304 break; 304 break;
305 case AUDIT_FAIL_PRINTK: 305 case AUDIT_FAIL_PRINTK:
306 if (printk_ratelimit()) 306 if (printk_ratelimit())
307 pr_err("%s\n", message 307 pr_err("%s\n", message);
308 break; 308 break;
309 case AUDIT_FAIL_PANIC: 309 case AUDIT_FAIL_PANIC:
310 panic("audit: %s\n", message); 310 panic("audit: %s\n", message);
311 break; 311 break;
312 } 312 }
313 } 313 }
314 314
315 static inline int audit_rate_check(void) 315 static inline int audit_rate_check(void)
316 { 316 {
317 static unsigned long last_check = 0 317 static unsigned long last_check = 0;
318 static int messages = 0 318 static int messages = 0;
319 static DEFINE_SPINLOCK(lock); 319 static DEFINE_SPINLOCK(lock);
320 unsigned long flags; 320 unsigned long flags;
321 unsigned long now; 321 unsigned long now;
322 int retval = 0 322 int retval = 0;
323 323
324 if (!audit_rate_limit) 324 if (!audit_rate_limit)
325 return 1; 325 return 1;
326 326
327 spin_lock_irqsave(&lock, flags); 327 spin_lock_irqsave(&lock, flags);
328 if (++messages < audit_rate_limit) { 328 if (++messages < audit_rate_limit) {
329 retval = 1; 329 retval = 1;
330 } else { 330 } else {
331 now = jiffies; 331 now = jiffies;
332 if (time_after(now, last_check 332 if (time_after(now, last_check + HZ)) {
333 last_check = now; 333 last_check = now;
334 messages = 0; 334 messages = 0;
335 retval = 1; 335 retval = 1;
336 } 336 }
337 } 337 }
338 spin_unlock_irqrestore(&lock, flags); 338 spin_unlock_irqrestore(&lock, flags);
339 339
340 return retval; 340 return retval;
341 } 341 }
342 342
343 /** 343 /**
344 * audit_log_lost - conditionally log lost aud 344 * audit_log_lost - conditionally log lost audit message event
345 * @message: the message stating reason for lo 345 * @message: the message stating reason for lost audit message
346 * 346 *
347 * Emit at least 1 message per second, even if 347 * Emit at least 1 message per second, even if audit_rate_check is
348 * throttling. 348 * throttling.
349 * Always increment the lost messages counter. 349 * Always increment the lost messages counter.
350 */ 350 */
351 void audit_log_lost(const char *message) 351 void audit_log_lost(const char *message)
352 { 352 {
353 static unsigned long last_msg = 0; 353 static unsigned long last_msg = 0;
354 static DEFINE_SPINLOCK(lock); 354 static DEFINE_SPINLOCK(lock);
355 unsigned long flags; 355 unsigned long flags;
356 unsigned long now; 356 unsigned long now;
357 int print; 357 int print;
358 358
359 atomic_inc(&audit_lost); 359 atomic_inc(&audit_lost);
360 360
361 print = (audit_failure == AUDIT_FAIL_P 361 print = (audit_failure == AUDIT_FAIL_PANIC || !audit_rate_limit);
362 362
363 if (!print) { 363 if (!print) {
364 spin_lock_irqsave(&lock, flags 364 spin_lock_irqsave(&lock, flags);
365 now = jiffies; 365 now = jiffies;
366 if (time_after(now, last_msg + 366 if (time_after(now, last_msg + HZ)) {
367 print = 1; 367 print = 1;
368 last_msg = now; 368 last_msg = now;
369 } 369 }
370 spin_unlock_irqrestore(&lock, 370 spin_unlock_irqrestore(&lock, flags);
371 } 371 }
372 372
373 if (print) { 373 if (print) {
374 if (printk_ratelimit()) 374 if (printk_ratelimit())
375 pr_warn("audit_lost=%u 375 pr_warn("audit_lost=%u audit_rate_limit=%u audit_backlog_limit=%u\n",
376 atomic_read(&a 376 atomic_read(&audit_lost),
377 audit_rate_lim 377 audit_rate_limit,
378 audit_backlog_ 378 audit_backlog_limit);
379 audit_panic(message); 379 audit_panic(message);
380 } 380 }
381 } 381 }
382 382
383 static int audit_log_config_change(char *funct 383 static int audit_log_config_change(char *function_name, u32 new, u32 old,
384 int allow_c 384 int allow_changes)
385 { 385 {
386 struct audit_buffer *ab; 386 struct audit_buffer *ab;
387 int rc = 0; 387 int rc = 0;
388 388
389 ab = audit_log_start(audit_context(), 389 ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_CONFIG_CHANGE);
390 if (unlikely(!ab)) 390 if (unlikely(!ab))
391 return rc; 391 return rc;
392 audit_log_format(ab, "op=set %s=%u old 392 audit_log_format(ab, "op=set %s=%u old=%u ", function_name, new, old);
393 audit_log_session_info(ab); 393 audit_log_session_info(ab);
394 rc = audit_log_task_context(ab); 394 rc = audit_log_task_context(ab);
395 if (rc) 395 if (rc)
396 allow_changes = 0; /* Somethin 396 allow_changes = 0; /* Something weird, deny request */
397 audit_log_format(ab, " res=%d", allow_ 397 audit_log_format(ab, " res=%d", allow_changes);
398 audit_log_end(ab); 398 audit_log_end(ab);
399 return rc; 399 return rc;
400 } 400 }
401 401
402 static int audit_do_config_change(char *functi 402 static int audit_do_config_change(char *function_name, u32 *to_change, u32 new)
403 { 403 {
404 int allow_changes, rc = 0; 404 int allow_changes, rc = 0;
405 u32 old = *to_change; 405 u32 old = *to_change;
406 406
407 /* check if we are locked */ 407 /* check if we are locked */
408 if (audit_enabled == AUDIT_LOCKED) 408 if (audit_enabled == AUDIT_LOCKED)
409 allow_changes = 0; 409 allow_changes = 0;
410 else 410 else
411 allow_changes = 1; 411 allow_changes = 1;
412 412
413 if (audit_enabled != AUDIT_OFF) { 413 if (audit_enabled != AUDIT_OFF) {
414 rc = audit_log_config_change(f 414 rc = audit_log_config_change(function_name, new, old, allow_changes);
415 if (rc) 415 if (rc)
416 allow_changes = 0; 416 allow_changes = 0;
417 } 417 }
418 418
419 /* If we are allowed, make the change 419 /* If we are allowed, make the change */
420 if (allow_changes == 1) 420 if (allow_changes == 1)
421 *to_change = new; 421 *to_change = new;
422 /* Not allowed, update reason */ 422 /* Not allowed, update reason */
423 else if (rc == 0) 423 else if (rc == 0)
424 rc = -EPERM; 424 rc = -EPERM;
425 return rc; 425 return rc;
426 } 426 }
427 427
428 static int audit_set_rate_limit(u32 limit) 428 static int audit_set_rate_limit(u32 limit)
429 { 429 {
430 return audit_do_config_change("audit_r 430 return audit_do_config_change("audit_rate_limit", &audit_rate_limit, limit);
431 } 431 }
432 432
433 static int audit_set_backlog_limit(u32 limit) 433 static int audit_set_backlog_limit(u32 limit)
434 { 434 {
435 return audit_do_config_change("audit_b 435 return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit, limit);
436 } 436 }
437 437
438 static int audit_set_backlog_wait_time(u32 tim 438 static int audit_set_backlog_wait_time(u32 timeout)
439 { 439 {
440 return audit_do_config_change("audit_b 440 return audit_do_config_change("audit_backlog_wait_time",
441 &audit_b 441 &audit_backlog_wait_time, timeout);
442 } 442 }
443 443
444 static int audit_set_enabled(u32 state) 444 static int audit_set_enabled(u32 state)
445 { 445 {
446 int rc; 446 int rc;
447 if (state > AUDIT_LOCKED) 447 if (state > AUDIT_LOCKED)
448 return -EINVAL; 448 return -EINVAL;
449 449
450 rc = audit_do_config_change("audit_en 450 rc = audit_do_config_change("audit_enabled", &audit_enabled, state);
451 if (!rc) 451 if (!rc)
452 audit_ever_enabled |= !!state; 452 audit_ever_enabled |= !!state;
453 453
454 return rc; 454 return rc;
455 } 455 }
456 456
457 static int audit_set_failure(u32 state) 457 static int audit_set_failure(u32 state)
458 { 458 {
459 if (state != AUDIT_FAIL_SILENT 459 if (state != AUDIT_FAIL_SILENT
460 && state != AUDIT_FAIL_PRINTK 460 && state != AUDIT_FAIL_PRINTK
461 && state != AUDIT_FAIL_PANIC) 461 && state != AUDIT_FAIL_PANIC)
462 return -EINVAL; 462 return -EINVAL;
463 463
464 return audit_do_config_change("audit_f 464 return audit_do_config_change("audit_failure", &audit_failure, state);
465 } 465 }
466 466
467 /** 467 /**
468 * auditd_conn_free - RCU helper to release an 468 * auditd_conn_free - RCU helper to release an auditd connection struct
469 * @rcu: RCU head 469 * @rcu: RCU head
470 * 470 *
471 * Description: 471 * Description:
472 * Drop any references inside the auditd conne 472 * Drop any references inside the auditd connection tracking struct and free
473 * the memory. 473 * the memory.
474 */ 474 */
475 static void auditd_conn_free(struct rcu_head * 475 static void auditd_conn_free(struct rcu_head *rcu)
476 { 476 {
477 struct auditd_connection *ac; 477 struct auditd_connection *ac;
478 478
479 ac = container_of(rcu, struct auditd_c 479 ac = container_of(rcu, struct auditd_connection, rcu);
480 put_pid(ac->pid); 480 put_pid(ac->pid);
481 put_net(ac->net); 481 put_net(ac->net);
482 kfree(ac); 482 kfree(ac);
483 } 483 }
484 484
485 /** 485 /**
486 * auditd_set - Set/Reset the auditd connectio 486 * auditd_set - Set/Reset the auditd connection state
487 * @pid: auditd PID 487 * @pid: auditd PID
488 * @portid: auditd netlink portid 488 * @portid: auditd netlink portid
489 * @net: auditd network namespace pointer 489 * @net: auditd network namespace pointer
490 * @skb: the netlink command from the audit da 490 * @skb: the netlink command from the audit daemon
491 * @ack: netlink ack flag, cleared if ack'd he 491 * @ack: netlink ack flag, cleared if ack'd here
492 * 492 *
493 * Description: 493 * Description:
494 * This function will obtain and drop network 494 * This function will obtain and drop network namespace references as
495 * necessary. Returns zero on success, negati 495 * necessary. Returns zero on success, negative values on failure.
496 */ 496 */
497 static int auditd_set(struct pid *pid, u32 por 497 static int auditd_set(struct pid *pid, u32 portid, struct net *net,
498 struct sk_buff *skb, boo 498 struct sk_buff *skb, bool *ack)
499 { 499 {
500 unsigned long flags; 500 unsigned long flags;
501 struct auditd_connection *ac_old, *ac_ 501 struct auditd_connection *ac_old, *ac_new;
502 struct nlmsghdr *nlh; 502 struct nlmsghdr *nlh;
503 503
504 if (!pid || !net) 504 if (!pid || !net)
505 return -EINVAL; 505 return -EINVAL;
506 506
507 ac_new = kzalloc(sizeof(*ac_new), GFP_ 507 ac_new = kzalloc(sizeof(*ac_new), GFP_KERNEL);
508 if (!ac_new) 508 if (!ac_new)
509 return -ENOMEM; 509 return -ENOMEM;
510 ac_new->pid = get_pid(pid); 510 ac_new->pid = get_pid(pid);
511 ac_new->portid = portid; 511 ac_new->portid = portid;
512 ac_new->net = get_net(net); 512 ac_new->net = get_net(net);
513 513
514 /* send the ack now to avoid a race wi 514 /* send the ack now to avoid a race with the queue backlog */
515 if (*ack) { 515 if (*ack) {
516 nlh = nlmsg_hdr(skb); 516 nlh = nlmsg_hdr(skb);
517 netlink_ack(skb, nlh, 0, NULL) 517 netlink_ack(skb, nlh, 0, NULL);
518 *ack = false; 518 *ack = false;
519 } 519 }
520 520
521 spin_lock_irqsave(&auditd_conn_lock, f 521 spin_lock_irqsave(&auditd_conn_lock, flags);
522 ac_old = rcu_dereference_protected(aud 522 ac_old = rcu_dereference_protected(auditd_conn,
523 loc 523 lockdep_is_held(&auditd_conn_lock));
524 rcu_assign_pointer(auditd_conn, ac_new 524 rcu_assign_pointer(auditd_conn, ac_new);
525 spin_unlock_irqrestore(&auditd_conn_lo 525 spin_unlock_irqrestore(&auditd_conn_lock, flags);
526 526
527 if (ac_old) 527 if (ac_old)
528 call_rcu(&ac_old->rcu, auditd_ 528 call_rcu(&ac_old->rcu, auditd_conn_free);
529 529
530 return 0; 530 return 0;
531 } 531 }
532 532
533 /** 533 /**
534 * kauditd_printk_skb - Print the audit record 534 * kauditd_printk_skb - Print the audit record to the ring buffer
535 * @skb: audit record 535 * @skb: audit record
536 * 536 *
537 * Whatever the reason, this packet may not ma 537 * Whatever the reason, this packet may not make it to the auditd connection
538 * so write it via printk so the information i 538 * so write it via printk so the information isn't completely lost.
539 */ 539 */
540 static void kauditd_printk_skb(struct sk_buff 540 static void kauditd_printk_skb(struct sk_buff *skb)
541 { 541 {
542 struct nlmsghdr *nlh = nlmsg_hdr(skb); 542 struct nlmsghdr *nlh = nlmsg_hdr(skb);
543 char *data = nlmsg_data(nlh); 543 char *data = nlmsg_data(nlh);
544 544
545 if (nlh->nlmsg_type != AUDIT_EOE && pr 545 if (nlh->nlmsg_type != AUDIT_EOE && printk_ratelimit())
546 pr_notice("type=%d %s\n", nlh- 546 pr_notice("type=%d %s\n", nlh->nlmsg_type, data);
547 } 547 }
548 548
549 /** 549 /**
550 * kauditd_rehold_skb - Handle a audit record 550 * kauditd_rehold_skb - Handle a audit record send failure in the hold queue
551 * @skb: audit record 551 * @skb: audit record
552 * @error: error code (unused) 552 * @error: error code (unused)
553 * 553 *
554 * Description: 554 * Description:
555 * This should only be used by the kauditd_thr 555 * This should only be used by the kauditd_thread when it fails to flush the
556 * hold queue. 556 * hold queue.
557 */ 557 */
558 static void kauditd_rehold_skb(struct sk_buff 558 static void kauditd_rehold_skb(struct sk_buff *skb, __always_unused int error)
559 { 559 {
560 /* put the record back in the queue */ 560 /* put the record back in the queue */
561 skb_queue_tail(&audit_hold_queue, skb) 561 skb_queue_tail(&audit_hold_queue, skb);
562 } 562 }
563 563
564 /** 564 /**
565 * kauditd_hold_skb - Queue an audit record, w 565 * kauditd_hold_skb - Queue an audit record, waiting for auditd
566 * @skb: audit record 566 * @skb: audit record
567 * @error: error code 567 * @error: error code
568 * 568 *
569 * Description: 569 * Description:
570 * Queue the audit record, waiting for an inst 570 * Queue the audit record, waiting for an instance of auditd. When this
571 * function is called we haven't given up yet 571 * function is called we haven't given up yet on sending the record, but things
572 * are not looking good. The first thing we w 572 * are not looking good. The first thing we want to do is try to write the
573 * record via printk and then see if we want t 573 * record via printk and then see if we want to try and hold on to the record
574 * and queue it, if we have room. If we want 574 * and queue it, if we have room. If we want to hold on to the record, but we
575 * don't have room, record a record lost messa 575 * don't have room, record a record lost message.
576 */ 576 */
577 static void kauditd_hold_skb(struct sk_buff *s 577 static void kauditd_hold_skb(struct sk_buff *skb, int error)
578 { 578 {
579 /* at this point it is uncertain if we 579 /* at this point it is uncertain if we will ever send this to auditd so
580 * try to send the message via printk 580 * try to send the message via printk before we go any further */
581 kauditd_printk_skb(skb); 581 kauditd_printk_skb(skb);
582 582
583 /* can we just silently drop the messa 583 /* can we just silently drop the message? */
584 if (!audit_default) 584 if (!audit_default)
585 goto drop; 585 goto drop;
586 586
587 /* the hold queue is only for when the 587 /* the hold queue is only for when the daemon goes away completely,
588 * not -EAGAIN failures; if we are in 588 * not -EAGAIN failures; if we are in a -EAGAIN state requeue the
589 * record on the retry queue unless it 589 * record on the retry queue unless it's full, in which case drop it
590 */ 590 */
591 if (error == -EAGAIN) { 591 if (error == -EAGAIN) {
592 if (!audit_backlog_limit || 592 if (!audit_backlog_limit ||
593 skb_queue_len(&audit_retry 593 skb_queue_len(&audit_retry_queue) < audit_backlog_limit) {
594 skb_queue_tail(&audit_ 594 skb_queue_tail(&audit_retry_queue, skb);
595 return; 595 return;
596 } 596 }
597 audit_log_lost("kauditd retry 597 audit_log_lost("kauditd retry queue overflow");
598 goto drop; 598 goto drop;
599 } 599 }
600 600
601 /* if we have room in the hold queue, 601 /* if we have room in the hold queue, queue the message */
602 if (!audit_backlog_limit || 602 if (!audit_backlog_limit ||
603 skb_queue_len(&audit_hold_queue) < 603 skb_queue_len(&audit_hold_queue) < audit_backlog_limit) {
604 skb_queue_tail(&audit_hold_que 604 skb_queue_tail(&audit_hold_queue, skb);
605 return; 605 return;
606 } 606 }
607 607
608 /* we have no other options - drop the 608 /* we have no other options - drop the message */
609 audit_log_lost("kauditd hold queue ove 609 audit_log_lost("kauditd hold queue overflow");
610 drop: 610 drop:
611 kfree_skb(skb); 611 kfree_skb(skb);
612 } 612 }
613 613
614 /** 614 /**
615 * kauditd_retry_skb - Queue an audit record, 615 * kauditd_retry_skb - Queue an audit record, attempt to send again to auditd
616 * @skb: audit record 616 * @skb: audit record
617 * @error: error code (unused) 617 * @error: error code (unused)
618 * 618 *
619 * Description: 619 * Description:
620 * Not as serious as kauditd_hold_skb() as we 620 * Not as serious as kauditd_hold_skb() as we still have a connected auditd,
621 * but for some reason we are having problems 621 * but for some reason we are having problems sending it audit records so
622 * queue the given record and attempt to resen 622 * queue the given record and attempt to resend.
623 */ 623 */
624 static void kauditd_retry_skb(struct sk_buff * 624 static void kauditd_retry_skb(struct sk_buff *skb, __always_unused int error)
625 { 625 {
626 if (!audit_backlog_limit || 626 if (!audit_backlog_limit ||
627 skb_queue_len(&audit_retry_queue) 627 skb_queue_len(&audit_retry_queue) < audit_backlog_limit) {
628 skb_queue_tail(&audit_retry_qu 628 skb_queue_tail(&audit_retry_queue, skb);
629 return; 629 return;
630 } 630 }
631 631
632 /* we have to drop the record, send it 632 /* we have to drop the record, send it via printk as a last effort */
633 kauditd_printk_skb(skb); 633 kauditd_printk_skb(skb);
634 audit_log_lost("kauditd retry queue ov 634 audit_log_lost("kauditd retry queue overflow");
635 kfree_skb(skb); 635 kfree_skb(skb);
636 } 636 }
637 637
638 /** 638 /**
639 * auditd_reset - Disconnect the auditd connec 639 * auditd_reset - Disconnect the auditd connection
640 * @ac: auditd connection state 640 * @ac: auditd connection state
641 * 641 *
642 * Description: 642 * Description:
643 * Break the auditd/kauditd connection and mov 643 * Break the auditd/kauditd connection and move all the queued records into the
644 * hold queue in case auditd reconnects. It i 644 * hold queue in case auditd reconnects. It is important to note that the @ac
645 * pointer should never be dereferenced inside 645 * pointer should never be dereferenced inside this function as it may be NULL
646 * or invalid, you can only compare the memory 646 * or invalid, you can only compare the memory address! If @ac is NULL then
647 * the connection will always be reset. 647 * the connection will always be reset.
648 */ 648 */
649 static void auditd_reset(const struct auditd_c 649 static void auditd_reset(const struct auditd_connection *ac)
650 { 650 {
651 unsigned long flags; 651 unsigned long flags;
652 struct sk_buff *skb; 652 struct sk_buff *skb;
653 struct auditd_connection *ac_old; 653 struct auditd_connection *ac_old;
654 654
655 /* if it isn't already broken, break t 655 /* if it isn't already broken, break the connection */
656 spin_lock_irqsave(&auditd_conn_lock, f 656 spin_lock_irqsave(&auditd_conn_lock, flags);
657 ac_old = rcu_dereference_protected(aud 657 ac_old = rcu_dereference_protected(auditd_conn,
658 loc 658 lockdep_is_held(&auditd_conn_lock));
659 if (ac && ac != ac_old) { 659 if (ac && ac != ac_old) {
660 /* someone already registered 660 /* someone already registered a new auditd connection */
661 spin_unlock_irqrestore(&auditd 661 spin_unlock_irqrestore(&auditd_conn_lock, flags);
662 return; 662 return;
663 } 663 }
664 rcu_assign_pointer(auditd_conn, NULL); 664 rcu_assign_pointer(auditd_conn, NULL);
665 spin_unlock_irqrestore(&auditd_conn_lo 665 spin_unlock_irqrestore(&auditd_conn_lock, flags);
666 666
667 if (ac_old) 667 if (ac_old)
668 call_rcu(&ac_old->rcu, auditd_ 668 call_rcu(&ac_old->rcu, auditd_conn_free);
669 669
670 /* flush the retry queue to the hold q 670 /* flush the retry queue to the hold queue, but don't touch the main
671 * queue since we need to process that 671 * queue since we need to process that normally for multicast */
672 while ((skb = skb_dequeue(&audit_retry 672 while ((skb = skb_dequeue(&audit_retry_queue)))
673 kauditd_hold_skb(skb, -ECONNRE 673 kauditd_hold_skb(skb, -ECONNREFUSED);
674 } 674 }
675 675
676 /** 676 /**
677 * auditd_send_unicast_skb - Send a record via 677 * auditd_send_unicast_skb - Send a record via unicast to auditd
678 * @skb: audit record 678 * @skb: audit record
679 * 679 *
680 * Description: 680 * Description:
681 * Send a skb to the audit daemon, returns pos 681 * Send a skb to the audit daemon, returns positive/zero values on success and
682 * negative values on failure; in all cases th 682 * negative values on failure; in all cases the skb will be consumed by this
683 * function. If the send results in -ECONNREF 683 * function. If the send results in -ECONNREFUSED the connection with auditd
684 * will be reset. This function may sleep so 684 * will be reset. This function may sleep so callers should not hold any locks
685 * where this would cause a problem. 685 * where this would cause a problem.
686 */ 686 */
687 static int auditd_send_unicast_skb(struct sk_b 687 static int auditd_send_unicast_skb(struct sk_buff *skb)
688 { 688 {
689 int rc; 689 int rc;
690 u32 portid; 690 u32 portid;
691 struct net *net; 691 struct net *net;
692 struct sock *sk; 692 struct sock *sk;
693 struct auditd_connection *ac; 693 struct auditd_connection *ac;
694 694
695 /* NOTE: we can't call netlink_unicast 695 /* NOTE: we can't call netlink_unicast while in the RCU section so
696 * take a reference to the netwo 696 * take a reference to the network namespace and grab local
697 * copies of the namespace, the 697 * copies of the namespace, the sock, and the portid; the
698 * namespace and sock aren't goi 698 * namespace and sock aren't going to go away while we hold a
699 * reference and if the portid d 699 * reference and if the portid does become invalid after the RCU
700 * section netlink_unicast() sho 700 * section netlink_unicast() should safely return an error */
701 701
702 rcu_read_lock(); 702 rcu_read_lock();
703 ac = rcu_dereference(auditd_conn); 703 ac = rcu_dereference(auditd_conn);
704 if (!ac) { 704 if (!ac) {
705 rcu_read_unlock(); 705 rcu_read_unlock();
706 kfree_skb(skb); 706 kfree_skb(skb);
707 rc = -ECONNREFUSED; 707 rc = -ECONNREFUSED;
708 goto err; 708 goto err;
709 } 709 }
710 net = get_net(ac->net); 710 net = get_net(ac->net);
711 sk = audit_get_sk(net); 711 sk = audit_get_sk(net);
712 portid = ac->portid; 712 portid = ac->portid;
713 rcu_read_unlock(); 713 rcu_read_unlock();
714 714
715 rc = netlink_unicast(sk, skb, portid, 715 rc = netlink_unicast(sk, skb, portid, 0);
716 put_net(net); 716 put_net(net);
717 if (rc < 0) 717 if (rc < 0)
718 goto err; 718 goto err;
719 719
720 return rc; 720 return rc;
721 721
722 err: 722 err:
723 if (ac && rc == -ECONNREFUSED) 723 if (ac && rc == -ECONNREFUSED)
724 auditd_reset(ac); 724 auditd_reset(ac);
725 return rc; 725 return rc;
726 } 726 }
727 727
728 /** 728 /**
729 * kauditd_send_queue - Helper for kauditd_thr 729 * kauditd_send_queue - Helper for kauditd_thread to flush skb queues
730 * @sk: the sending sock 730 * @sk: the sending sock
731 * @portid: the netlink destination 731 * @portid: the netlink destination
732 * @queue: the skb queue to process 732 * @queue: the skb queue to process
733 * @retry_limit: limit on number of netlink un 733 * @retry_limit: limit on number of netlink unicast failures
734 * @skb_hook: per-skb hook for additional proc 734 * @skb_hook: per-skb hook for additional processing
735 * @err_hook: hook called if the skb fails the 735 * @err_hook: hook called if the skb fails the netlink unicast send
736 * 736 *
737 * Description: 737 * Description:
738 * Run through the given queue and attempt to 738 * Run through the given queue and attempt to send the audit records to auditd,
739 * returns zero on success, negative values on 739 * returns zero on success, negative values on failure. It is up to the caller
740 * to ensure that the @sk is valid for the dur 740 * to ensure that the @sk is valid for the duration of this function.
741 * 741 *
742 */ 742 */
743 static int kauditd_send_queue(struct sock *sk, 743 static int kauditd_send_queue(struct sock *sk, u32 portid,
744 struct sk_buff_h 744 struct sk_buff_head *queue,
745 unsigned int ret 745 unsigned int retry_limit,
746 void (*skb_hook) 746 void (*skb_hook)(struct sk_buff *skb),
747 void (*err_hook) 747 void (*err_hook)(struct sk_buff *skb, int error))
748 { 748 {
749 int rc = 0; 749 int rc = 0;
750 struct sk_buff *skb = NULL; 750 struct sk_buff *skb = NULL;
751 struct sk_buff *skb_tail; 751 struct sk_buff *skb_tail;
752 unsigned int failed = 0; 752 unsigned int failed = 0;
753 753
754 /* NOTE: kauditd_thread takes care of 754 /* NOTE: kauditd_thread takes care of all our locking, we just use
755 * the netlink info passed to us 755 * the netlink info passed to us (e.g. sk and portid) */
756 756
757 skb_tail = skb_peek_tail(queue); 757 skb_tail = skb_peek_tail(queue);
758 while ((skb != skb_tail) && (skb = skb 758 while ((skb != skb_tail) && (skb = skb_dequeue(queue))) {
759 /* call the skb_hook for each 759 /* call the skb_hook for each skb we touch */
760 if (skb_hook) 760 if (skb_hook)
761 (*skb_hook)(skb); 761 (*skb_hook)(skb);
762 762
763 /* can we send to anyone via u 763 /* can we send to anyone via unicast? */
764 if (!sk) { 764 if (!sk) {
765 if (err_hook) 765 if (err_hook)
766 (*err_hook)(sk 766 (*err_hook)(skb, -ECONNREFUSED);
767 continue; 767 continue;
768 } 768 }
769 769
770 retry: 770 retry:
771 /* grab an extra skb reference 771 /* grab an extra skb reference in case of error */
772 skb_get(skb); 772 skb_get(skb);
773 rc = netlink_unicast(sk, skb, 773 rc = netlink_unicast(sk, skb, portid, 0);
774 if (rc < 0) { 774 if (rc < 0) {
775 /* send failed - try a 775 /* send failed - try a few times unless fatal error */
776 if (++failed >= retry_ 776 if (++failed >= retry_limit ||
777 rc == -ECONNREFUSE 777 rc == -ECONNREFUSED || rc == -EPERM) {
778 sk = NULL; 778 sk = NULL;
779 if (err_hook) 779 if (err_hook)
780 (*err_ 780 (*err_hook)(skb, rc);
781 if (rc == -EAG 781 if (rc == -EAGAIN)
782 rc = 0 782 rc = 0;
783 /* continue to 783 /* continue to drain the queue */
784 continue; 784 continue;
785 } else 785 } else
786 goto retry; 786 goto retry;
787 } else { 787 } else {
788 /* skb sent - drop the 788 /* skb sent - drop the extra reference and continue */
789 consume_skb(skb); 789 consume_skb(skb);
790 failed = 0; 790 failed = 0;
791 } 791 }
792 } 792 }
793 793
794 return (rc >= 0 ? 0 : rc); 794 return (rc >= 0 ? 0 : rc);
795 } 795 }
796 796
797 /* 797 /*
798 * kauditd_send_multicast_skb - Send a record 798 * kauditd_send_multicast_skb - Send a record to any multicast listeners
799 * @skb: audit record 799 * @skb: audit record
800 * 800 *
801 * Description: 801 * Description:
802 * Write a multicast message to anyone listeni 802 * Write a multicast message to anyone listening in the initial network
803 * namespace. This function doesn't consume a 803 * namespace. This function doesn't consume an skb as might be expected since
804 * it has to copy it anyways. 804 * it has to copy it anyways.
805 */ 805 */
806 static void kauditd_send_multicast_skb(struct 806 static void kauditd_send_multicast_skb(struct sk_buff *skb)
807 { 807 {
808 struct sk_buff *copy; 808 struct sk_buff *copy;
809 struct sock *sock = audit_get_sk(&init 809 struct sock *sock = audit_get_sk(&init_net);
810 struct nlmsghdr *nlh; 810 struct nlmsghdr *nlh;
811 811
812 /* NOTE: we are not taking an addition 812 /* NOTE: we are not taking an additional reference for init_net since
813 * we don't have to worry about 813 * we don't have to worry about it going away */
814 814
815 if (!netlink_has_listeners(sock, AUDIT 815 if (!netlink_has_listeners(sock, AUDIT_NLGRP_READLOG))
816 return; 816 return;
817 817
818 /* 818 /*
819 * The seemingly wasteful skb_copy() r 819 * The seemingly wasteful skb_copy() rather than bumping the refcount
820 * using skb_get() is necessary becaus 820 * using skb_get() is necessary because non-standard mods are made to
821 * the skb by the original kaudit unic 821 * the skb by the original kaudit unicast socket send routine. The
822 * existing auditd daemon assumes this 822 * existing auditd daemon assumes this breakage. Fixing this would
823 * require co-ordinating a change in t 823 * require co-ordinating a change in the established protocol between
824 * the kaudit kernel subsystem and the 824 * the kaudit kernel subsystem and the auditd userspace code. There is
825 * no reason for new multicast clients 825 * no reason for new multicast clients to continue with this
826 * non-compliance. 826 * non-compliance.
827 */ 827 */
828 copy = skb_copy(skb, GFP_KERNEL); 828 copy = skb_copy(skb, GFP_KERNEL);
829 if (!copy) 829 if (!copy)
830 return; 830 return;
831 nlh = nlmsg_hdr(copy); 831 nlh = nlmsg_hdr(copy);
832 nlh->nlmsg_len = skb->len; 832 nlh->nlmsg_len = skb->len;
833 833
834 nlmsg_multicast(sock, copy, 0, AUDIT_N 834 nlmsg_multicast(sock, copy, 0, AUDIT_NLGRP_READLOG, GFP_KERNEL);
835 } 835 }
836 836
837 /** 837 /**
838 * kauditd_thread - Worker thread to send audi 838 * kauditd_thread - Worker thread to send audit records to userspace
839 * @dummy: unused 839 * @dummy: unused
840 */ 840 */
841 static int kauditd_thread(void *dummy) 841 static int kauditd_thread(void *dummy)
842 { 842 {
843 int rc; 843 int rc;
844 u32 portid = 0; 844 u32 portid = 0;
845 struct net *net = NULL; 845 struct net *net = NULL;
846 struct sock *sk = NULL; 846 struct sock *sk = NULL;
847 struct auditd_connection *ac; 847 struct auditd_connection *ac;
848 848
849 #define UNICAST_RETRIES 5 849 #define UNICAST_RETRIES 5
850 850
851 set_freezable(); 851 set_freezable();
852 while (!kthread_should_stop()) { 852 while (!kthread_should_stop()) {
853 /* NOTE: see the lock comments 853 /* NOTE: see the lock comments in auditd_send_unicast_skb() */
854 rcu_read_lock(); 854 rcu_read_lock();
855 ac = rcu_dereference(auditd_co 855 ac = rcu_dereference(auditd_conn);
856 if (!ac) { 856 if (!ac) {
857 rcu_read_unlock(); 857 rcu_read_unlock();
858 goto main_queue; 858 goto main_queue;
859 } 859 }
860 net = get_net(ac->net); 860 net = get_net(ac->net);
861 sk = audit_get_sk(net); 861 sk = audit_get_sk(net);
862 portid = ac->portid; 862 portid = ac->portid;
863 rcu_read_unlock(); 863 rcu_read_unlock();
864 864
865 /* attempt to flush the hold q 865 /* attempt to flush the hold queue */
866 rc = kauditd_send_queue(sk, po 866 rc = kauditd_send_queue(sk, portid,
867 &audit 867 &audit_hold_queue, UNICAST_RETRIES,
868 NULL, 868 NULL, kauditd_rehold_skb);
869 if (rc < 0) { 869 if (rc < 0) {
870 sk = NULL; 870 sk = NULL;
871 auditd_reset(ac); 871 auditd_reset(ac);
872 goto main_queue; 872 goto main_queue;
873 } 873 }
874 874
875 /* attempt to flush the retry 875 /* attempt to flush the retry queue */
876 rc = kauditd_send_queue(sk, po 876 rc = kauditd_send_queue(sk, portid,
877 &audit 877 &audit_retry_queue, UNICAST_RETRIES,
878 NULL, 878 NULL, kauditd_hold_skb);
879 if (rc < 0) { 879 if (rc < 0) {
880 sk = NULL; 880 sk = NULL;
881 auditd_reset(ac); 881 auditd_reset(ac);
882 goto main_queue; 882 goto main_queue;
883 } 883 }
884 884
885 main_queue: 885 main_queue:
886 /* process the main queue - do 886 /* process the main queue - do the multicast send and attempt
887 * unicast, dump failed record 887 * unicast, dump failed record sends to the retry queue; if
888 * sk == NULL due to previous 888 * sk == NULL due to previous failures we will just do the
889 * multicast send and move the 889 * multicast send and move the record to the hold queue */
890 rc = kauditd_send_queue(sk, po 890 rc = kauditd_send_queue(sk, portid, &audit_queue, 1,
891 kaudit 891 kauditd_send_multicast_skb,
892 (sk ? 892 (sk ?
893 kaudi 893 kauditd_retry_skb : kauditd_hold_skb));
894 if (ac && rc < 0) 894 if (ac && rc < 0)
895 auditd_reset(ac); 895 auditd_reset(ac);
896 sk = NULL; 896 sk = NULL;
897 897
898 /* drop our netns reference, n 898 /* drop our netns reference, no auditd sends past this line */
899 if (net) { 899 if (net) {
900 put_net(net); 900 put_net(net);
901 net = NULL; 901 net = NULL;
902 } 902 }
903 903
904 /* we have processed all the q 904 /* we have processed all the queues so wake everyone */
905 wake_up(&audit_backlog_wait); 905 wake_up(&audit_backlog_wait);
906 906
907 /* NOTE: we want to wake up if 907 /* NOTE: we want to wake up if there is anything on the queue,
908 * regardless of if an a 908 * regardless of if an auditd is connected, as we need to
909 * do the multicast send 909 * do the multicast send and rotate records from the
910 * main queue to the ret 910 * main queue to the retry/hold queues */
911 wait_event_freezable(kauditd_w 911 wait_event_freezable(kauditd_wait,
912 (skb_queu 912 (skb_queue_len(&audit_queue) ? 1 : 0));
913 } 913 }
914 914
915 return 0; 915 return 0;
916 } 916 }
917 917
918 int audit_send_list_thread(void *_dest) 918 int audit_send_list_thread(void *_dest)
919 { 919 {
920 struct audit_netlink_list *dest = _des 920 struct audit_netlink_list *dest = _dest;
921 struct sk_buff *skb; 921 struct sk_buff *skb;
922 struct sock *sk = audit_get_sk(dest->n 922 struct sock *sk = audit_get_sk(dest->net);
923 923
924 /* wait for parent to finish and send 924 /* wait for parent to finish and send an ACK */
925 audit_ctl_lock(); 925 audit_ctl_lock();
926 audit_ctl_unlock(); 926 audit_ctl_unlock();
927 927
928 while ((skb = __skb_dequeue(&dest->q)) 928 while ((skb = __skb_dequeue(&dest->q)) != NULL)
929 netlink_unicast(sk, skb, dest- 929 netlink_unicast(sk, skb, dest->portid, 0);
930 930
931 put_net(dest->net); 931 put_net(dest->net);
932 kfree(dest); 932 kfree(dest);
933 933
934 return 0; 934 return 0;
935 } 935 }
936 936
937 struct sk_buff *audit_make_reply(int seq, int 937 struct sk_buff *audit_make_reply(int seq, int type, int done,
938 int multi, co 938 int multi, const void *payload, int size)
939 { 939 {
940 struct sk_buff *skb; 940 struct sk_buff *skb;
941 struct nlmsghdr *nlh; 941 struct nlmsghdr *nlh;
942 void *data; 942 void *data;
943 int flags = multi ? NLM_F_ 943 int flags = multi ? NLM_F_MULTI : 0;
944 int t = done ? NLMSG_ 944 int t = done ? NLMSG_DONE : type;
945 945
946 skb = nlmsg_new(size, GFP_KERNEL); 946 skb = nlmsg_new(size, GFP_KERNEL);
947 if (!skb) 947 if (!skb)
948 return NULL; 948 return NULL;
949 949
950 nlh = nlmsg_put(skb, 0, seq, t, si 950 nlh = nlmsg_put(skb, 0, seq, t, size, flags);
951 if (!nlh) 951 if (!nlh)
952 goto out_kfree_skb; 952 goto out_kfree_skb;
953 data = nlmsg_data(nlh); 953 data = nlmsg_data(nlh);
954 memcpy(data, payload, size); 954 memcpy(data, payload, size);
955 return skb; 955 return skb;
956 956
957 out_kfree_skb: 957 out_kfree_skb:
958 kfree_skb(skb); 958 kfree_skb(skb);
959 return NULL; 959 return NULL;
960 } 960 }
961 961
962 static void audit_free_reply(struct audit_repl 962 static void audit_free_reply(struct audit_reply *reply)
963 { 963 {
964 if (!reply) 964 if (!reply)
965 return; 965 return;
966 966
967 kfree_skb(reply->skb); 967 kfree_skb(reply->skb);
968 if (reply->net) 968 if (reply->net)
969 put_net(reply->net); 969 put_net(reply->net);
970 kfree(reply); 970 kfree(reply);
971 } 971 }
972 972
973 static int audit_send_reply_thread(void *arg) 973 static int audit_send_reply_thread(void *arg)
974 { 974 {
975 struct audit_reply *reply = (struct au 975 struct audit_reply *reply = (struct audit_reply *)arg;
976 976
977 audit_ctl_lock(); 977 audit_ctl_lock();
978 audit_ctl_unlock(); 978 audit_ctl_unlock();
979 979
980 /* Ignore failure. It'll only happen i 980 /* Ignore failure. It'll only happen if the sender goes away,
981 because our timeout is set to infin 981 because our timeout is set to infinite. */
982 netlink_unicast(audit_get_sk(reply->ne 982 netlink_unicast(audit_get_sk(reply->net), reply->skb, reply->portid, 0);
983 reply->skb = NULL; 983 reply->skb = NULL;
984 audit_free_reply(reply); 984 audit_free_reply(reply);
985 return 0; 985 return 0;
986 } 986 }
987 987
988 /** 988 /**
989 * audit_send_reply - send an audit reply mess 989 * audit_send_reply - send an audit reply message via netlink
990 * @request_skb: skb of request we are replyin 990 * @request_skb: skb of request we are replying to (used to target the reply)
991 * @seq: sequence number 991 * @seq: sequence number
992 * @type: audit message type 992 * @type: audit message type
993 * @done: done (last) flag 993 * @done: done (last) flag
994 * @multi: multi-part message flag 994 * @multi: multi-part message flag
995 * @payload: payload data 995 * @payload: payload data
996 * @size: payload size 996 * @size: payload size
997 * 997 *
998 * Allocates a skb, builds the netlink message 998 * Allocates a skb, builds the netlink message, and sends it to the port id.
999 */ 999 */
1000 static void audit_send_reply(struct sk_buff * 1000 static void audit_send_reply(struct sk_buff *request_skb, int seq, int type, int done,
1001 int multi, const 1001 int multi, const void *payload, int size)
1002 { 1002 {
1003 struct task_struct *tsk; 1003 struct task_struct *tsk;
1004 struct audit_reply *reply; 1004 struct audit_reply *reply;
1005 1005
1006 reply = kzalloc(sizeof(*reply), GFP_K 1006 reply = kzalloc(sizeof(*reply), GFP_KERNEL);
1007 if (!reply) 1007 if (!reply)
1008 return; 1008 return;
1009 1009
1010 reply->skb = audit_make_reply(seq, ty 1010 reply->skb = audit_make_reply(seq, type, done, multi, payload, size);
1011 if (!reply->skb) 1011 if (!reply->skb)
1012 goto err; 1012 goto err;
1013 reply->net = get_net(sock_net(NETLINK 1013 reply->net = get_net(sock_net(NETLINK_CB(request_skb).sk));
1014 reply->portid = NETLINK_CB(request_sk 1014 reply->portid = NETLINK_CB(request_skb).portid;
1015 1015
1016 tsk = kthread_run(audit_send_reply_th 1016 tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply");
1017 if (IS_ERR(tsk)) 1017 if (IS_ERR(tsk))
1018 goto err; 1018 goto err;
1019 1019
1020 return; 1020 return;
1021 1021
1022 err: 1022 err:
1023 audit_free_reply(reply); 1023 audit_free_reply(reply);
1024 } 1024 }
1025 1025
1026 /* 1026 /*
1027 * Check for appropriate CAP_AUDIT_ capabilit 1027 * Check for appropriate CAP_AUDIT_ capabilities on incoming audit
1028 * control messages. 1028 * control messages.
1029 */ 1029 */
1030 static int audit_netlink_ok(struct sk_buff *s 1030 static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
1031 { 1031 {
1032 int err = 0; 1032 int err = 0;
1033 1033
1034 /* Only support initial user namespac 1034 /* Only support initial user namespace for now. */
1035 /* 1035 /*
1036 * We return ECONNREFUSED because it 1036 * We return ECONNREFUSED because it tricks userspace into thinking
1037 * that audit was not configured into 1037 * that audit was not configured into the kernel. Lots of users
1038 * configure their PAM stack (because 1038 * configure their PAM stack (because that's what the distro does)
1039 * to reject login if unable to send 1039 * to reject login if unable to send messages to audit. If we return
1040 * ECONNREFUSED the PAM stack thinks 1040 * ECONNREFUSED the PAM stack thinks the kernel does not have audit
1041 * configured in and will let login p 1041 * configured in and will let login proceed. If we return EPERM
1042 * userspace will reject all logins. 1042 * userspace will reject all logins. This should be removed when we
1043 * support non init namespaces!! 1043 * support non init namespaces!!
1044 */ 1044 */
1045 if (current_user_ns() != &init_user_n 1045 if (current_user_ns() != &init_user_ns)
1046 return -ECONNREFUSED; 1046 return -ECONNREFUSED;
1047 1047
1048 switch (msg_type) { 1048 switch (msg_type) {
1049 case AUDIT_LIST: 1049 case AUDIT_LIST:
1050 case AUDIT_ADD: 1050 case AUDIT_ADD:
1051 case AUDIT_DEL: 1051 case AUDIT_DEL:
1052 return -EOPNOTSUPP; 1052 return -EOPNOTSUPP;
1053 case AUDIT_GET: 1053 case AUDIT_GET:
1054 case AUDIT_SET: 1054 case AUDIT_SET:
1055 case AUDIT_GET_FEATURE: 1055 case AUDIT_GET_FEATURE:
1056 case AUDIT_SET_FEATURE: 1056 case AUDIT_SET_FEATURE:
1057 case AUDIT_LIST_RULES: 1057 case AUDIT_LIST_RULES:
1058 case AUDIT_ADD_RULE: 1058 case AUDIT_ADD_RULE:
1059 case AUDIT_DEL_RULE: 1059 case AUDIT_DEL_RULE:
1060 case AUDIT_SIGNAL_INFO: 1060 case AUDIT_SIGNAL_INFO:
1061 case AUDIT_TTY_GET: 1061 case AUDIT_TTY_GET:
1062 case AUDIT_TTY_SET: 1062 case AUDIT_TTY_SET:
1063 case AUDIT_TRIM: 1063 case AUDIT_TRIM:
1064 case AUDIT_MAKE_EQUIV: 1064 case AUDIT_MAKE_EQUIV:
1065 /* Only support auditd and au 1065 /* Only support auditd and auditctl in initial pid namespace
1066 * for now. */ 1066 * for now. */
1067 if (task_active_pid_ns(curren 1067 if (task_active_pid_ns(current) != &init_pid_ns)
1068 return -EPERM; 1068 return -EPERM;
1069 1069
1070 if (!netlink_capable(skb, CAP 1070 if (!netlink_capable(skb, CAP_AUDIT_CONTROL))
1071 err = -EPERM; 1071 err = -EPERM;
1072 break; 1072 break;
1073 case AUDIT_USER: 1073 case AUDIT_USER:
1074 case AUDIT_FIRST_USER_MSG ... AUDIT_L 1074 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
1075 case AUDIT_FIRST_USER_MSG2 ... AUDIT_ 1075 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
1076 if (!netlink_capable(skb, CAP 1076 if (!netlink_capable(skb, CAP_AUDIT_WRITE))
1077 err = -EPERM; 1077 err = -EPERM;
1078 break; 1078 break;
1079 default: /* bad msg */ 1079 default: /* bad msg */
1080 err = -EINVAL; 1080 err = -EINVAL;
1081 } 1081 }
1082 1082
1083 return err; 1083 return err;
1084 } 1084 }
1085 1085
1086 static void audit_log_common_recv_msg(struct 1086 static void audit_log_common_recv_msg(struct audit_context *context,
1087 struc 1087 struct audit_buffer **ab, u16 msg_type)
1088 { 1088 {
1089 uid_t uid = from_kuid(&init_user_ns, 1089 uid_t uid = from_kuid(&init_user_ns, current_uid());
1090 pid_t pid = task_tgid_nr(current); 1090 pid_t pid = task_tgid_nr(current);
1091 1091
1092 if (!audit_enabled && msg_type != AUD 1092 if (!audit_enabled && msg_type != AUDIT_USER_AVC) {
1093 *ab = NULL; 1093 *ab = NULL;
1094 return; 1094 return;
1095 } 1095 }
1096 1096
1097 *ab = audit_log_start(context, GFP_KE 1097 *ab = audit_log_start(context, GFP_KERNEL, msg_type);
1098 if (unlikely(!*ab)) 1098 if (unlikely(!*ab))
1099 return; 1099 return;
1100 audit_log_format(*ab, "pid=%d uid=%u 1100 audit_log_format(*ab, "pid=%d uid=%u ", pid, uid);
1101 audit_log_session_info(*ab); 1101 audit_log_session_info(*ab);
1102 audit_log_task_context(*ab); 1102 audit_log_task_context(*ab);
1103 } 1103 }
1104 1104
1105 static inline void audit_log_user_recv_msg(st 1105 static inline void audit_log_user_recv_msg(struct audit_buffer **ab,
1106 u1 1106 u16 msg_type)
1107 { 1107 {
1108 audit_log_common_recv_msg(NULL, ab, m 1108 audit_log_common_recv_msg(NULL, ab, msg_type);
1109 } 1109 }
1110 1110
1111 static int is_audit_feature_set(int i) 1111 static int is_audit_feature_set(int i)
1112 { 1112 {
1113 return af.features & AUDIT_FEATURE_TO 1113 return af.features & AUDIT_FEATURE_TO_MASK(i);
1114 } 1114 }
1115 1115
1116 1116
1117 static int audit_get_feature(struct sk_buff * 1117 static int audit_get_feature(struct sk_buff *skb)
1118 { 1118 {
1119 u32 seq; 1119 u32 seq;
1120 1120
1121 seq = nlmsg_hdr(skb)->nlmsg_seq; 1121 seq = nlmsg_hdr(skb)->nlmsg_seq;
1122 1122
1123 audit_send_reply(skb, seq, AUDIT_GET_ 1123 audit_send_reply(skb, seq, AUDIT_GET_FEATURE, 0, 0, &af, sizeof(af));
1124 1124
1125 return 0; 1125 return 0;
1126 } 1126 }
1127 1127
1128 static void audit_log_feature_change(int whic 1128 static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature,
1129 u32 old_ 1129 u32 old_lock, u32 new_lock, int res)
1130 { 1130 {
1131 struct audit_buffer *ab; 1131 struct audit_buffer *ab;
1132 1132
1133 if (audit_enabled == AUDIT_OFF) 1133 if (audit_enabled == AUDIT_OFF)
1134 return; 1134 return;
1135 1135
1136 ab = audit_log_start(audit_context(), 1136 ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_FEATURE_CHANGE);
1137 if (!ab) 1137 if (!ab)
1138 return; 1138 return;
1139 audit_log_task_info(ab); 1139 audit_log_task_info(ab);
1140 audit_log_format(ab, " feature=%s old 1140 audit_log_format(ab, " feature=%s old=%u new=%u old_lock=%u new_lock=%u res=%d",
1141 audit_feature_names[ 1141 audit_feature_names[which], !!old_feature, !!new_feature,
1142 !!old_lock, !!new_lo 1142 !!old_lock, !!new_lock, res);
1143 audit_log_end(ab); 1143 audit_log_end(ab);
1144 } 1144 }
1145 1145
1146 static int audit_set_feature(struct audit_fea 1146 static int audit_set_feature(struct audit_features *uaf)
1147 { 1147 {
1148 int i; 1148 int i;
1149 1149
1150 BUILD_BUG_ON(AUDIT_LAST_FEATURE + 1 > 1150 BUILD_BUG_ON(AUDIT_LAST_FEATURE + 1 > ARRAY_SIZE(audit_feature_names));
1151 1151
1152 /* if there is ever a version 2 we sh 1152 /* if there is ever a version 2 we should handle that here */
1153 1153
1154 for (i = 0; i <= AUDIT_LAST_FEATURE; 1154 for (i = 0; i <= AUDIT_LAST_FEATURE; i++) {
1155 u32 feature = AUDIT_FEATURE_T 1155 u32 feature = AUDIT_FEATURE_TO_MASK(i);
1156 u32 old_feature, new_feature, 1156 u32 old_feature, new_feature, old_lock, new_lock;
1157 1157
1158 /* if we are not changing thi 1158 /* if we are not changing this feature, move along */
1159 if (!(feature & uaf->mask)) 1159 if (!(feature & uaf->mask))
1160 continue; 1160 continue;
1161 1161
1162 old_feature = af.features & f 1162 old_feature = af.features & feature;
1163 new_feature = uaf->features & 1163 new_feature = uaf->features & feature;
1164 new_lock = (uaf->lock | af.lo 1164 new_lock = (uaf->lock | af.lock) & feature;
1165 old_lock = af.lock & feature; 1165 old_lock = af.lock & feature;
1166 1166
1167 /* are we changing a locked f 1167 /* are we changing a locked feature? */
1168 if (old_lock && (new_feature 1168 if (old_lock && (new_feature != old_feature)) {
1169 audit_log_feature_cha 1169 audit_log_feature_change(i, old_feature, new_feature,
1170 1170 old_lock, new_lock, 0);
1171 return -EPERM; 1171 return -EPERM;
1172 } 1172 }
1173 } 1173 }
1174 /* nothing invalid, do the changes */ 1174 /* nothing invalid, do the changes */
1175 for (i = 0; i <= AUDIT_LAST_FEATURE; 1175 for (i = 0; i <= AUDIT_LAST_FEATURE; i++) {
1176 u32 feature = AUDIT_FEATURE_T 1176 u32 feature = AUDIT_FEATURE_TO_MASK(i);
1177 u32 old_feature, new_feature, 1177 u32 old_feature, new_feature, old_lock, new_lock;
1178 1178
1179 /* if we are not changing thi 1179 /* if we are not changing this feature, move along */
1180 if (!(feature & uaf->mask)) 1180 if (!(feature & uaf->mask))
1181 continue; 1181 continue;
1182 1182
1183 old_feature = af.features & f 1183 old_feature = af.features & feature;
1184 new_feature = uaf->features & 1184 new_feature = uaf->features & feature;
1185 old_lock = af.lock & feature; 1185 old_lock = af.lock & feature;
1186 new_lock = (uaf->lock | af.lo 1186 new_lock = (uaf->lock | af.lock) & feature;
1187 1187
1188 if (new_feature != old_featur 1188 if (new_feature != old_feature)
1189 audit_log_feature_cha 1189 audit_log_feature_change(i, old_feature, new_feature,
1190 1190 old_lock, new_lock, 1);
1191 1191
1192 if (new_feature) 1192 if (new_feature)
1193 af.features |= featur 1193 af.features |= feature;
1194 else 1194 else
1195 af.features &= ~featu 1195 af.features &= ~feature;
1196 af.lock |= new_lock; 1196 af.lock |= new_lock;
1197 } 1197 }
1198 1198
1199 return 0; 1199 return 0;
1200 } 1200 }
1201 1201
1202 static int audit_replace(struct pid *pid) 1202 static int audit_replace(struct pid *pid)
1203 { 1203 {
1204 pid_t pvnr; 1204 pid_t pvnr;
1205 struct sk_buff *skb; 1205 struct sk_buff *skb;
1206 1206
1207 pvnr = pid_vnr(pid); 1207 pvnr = pid_vnr(pid);
1208 skb = audit_make_reply(0, AUDIT_REPLA 1208 skb = audit_make_reply(0, AUDIT_REPLACE, 0, 0, &pvnr, sizeof(pvnr));
1209 if (!skb) 1209 if (!skb)
1210 return -ENOMEM; 1210 return -ENOMEM;
1211 return auditd_send_unicast_skb(skb); 1211 return auditd_send_unicast_skb(skb);
1212 } 1212 }
1213 1213
1214 static int audit_receive_msg(struct sk_buff * 1214 static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
1215 bool *ack) 1215 bool *ack)
1216 { 1216 {
1217 u32 seq; 1217 u32 seq;
1218 void *data; 1218 void *data;
1219 int data_len; 1219 int data_len;
1220 int err; 1220 int err;
1221 struct audit_buffer *ab; 1221 struct audit_buffer *ab;
1222 u16 msg_type = nl 1222 u16 msg_type = nlh->nlmsg_type;
1223 struct audit_sig_info *sig_data; 1223 struct audit_sig_info *sig_data;
1224 char *ctx = NULL; 1224 char *ctx = NULL;
1225 u32 len; 1225 u32 len;
1226 1226
1227 err = audit_netlink_ok(skb, msg_type) 1227 err = audit_netlink_ok(skb, msg_type);
1228 if (err) 1228 if (err)
1229 return err; 1229 return err;
1230 1230
1231 seq = nlh->nlmsg_seq; 1231 seq = nlh->nlmsg_seq;
1232 data = nlmsg_data(nlh); 1232 data = nlmsg_data(nlh);
1233 data_len = nlmsg_len(nlh); 1233 data_len = nlmsg_len(nlh);
1234 1234
1235 switch (msg_type) { 1235 switch (msg_type) {
1236 case AUDIT_GET: { 1236 case AUDIT_GET: {
1237 struct audit_status s; 1237 struct audit_status s;
1238 memset(&s, 0, sizeof(s)); 1238 memset(&s, 0, sizeof(s));
1239 s.enabled = 1239 s.enabled = audit_enabled;
1240 s.failure = 1240 s.failure = audit_failure;
1241 /* NOTE: use pid_vnr() so the 1241 /* NOTE: use pid_vnr() so the PID is relative to the current
1242 * namespace */ 1242 * namespace */
1243 s.pid = 1243 s.pid = auditd_pid_vnr();
1244 s.rate_limit = 1244 s.rate_limit = audit_rate_limit;
1245 s.backlog_limit = 1245 s.backlog_limit = audit_backlog_limit;
1246 s.lost = 1246 s.lost = atomic_read(&audit_lost);
1247 s.backlog = 1247 s.backlog = skb_queue_len(&audit_queue);
1248 s.feature_bitmap = 1248 s.feature_bitmap = AUDIT_FEATURE_BITMAP_ALL;
1249 s.backlog_wait_time = 1249 s.backlog_wait_time = audit_backlog_wait_time;
1250 s.backlog_wait_time_actual = 1250 s.backlog_wait_time_actual = atomic_read(&audit_backlog_wait_time_actual);
1251 audit_send_reply(skb, seq, AU 1251 audit_send_reply(skb, seq, AUDIT_GET, 0, 0, &s, sizeof(s));
1252 break; 1252 break;
1253 } 1253 }
1254 case AUDIT_SET: { 1254 case AUDIT_SET: {
1255 struct audit_status s; 1255 struct audit_status s;
1256 memset(&s, 0, sizeof(s)); 1256 memset(&s, 0, sizeof(s));
1257 /* guard against past and fut 1257 /* guard against past and future API changes */
1258 memcpy(&s, data, min_t(size_t 1258 memcpy(&s, data, min_t(size_t, sizeof(s), data_len));
1259 if (s.mask & AUDIT_STATUS_ENA 1259 if (s.mask & AUDIT_STATUS_ENABLED) {
1260 err = audit_set_enabl 1260 err = audit_set_enabled(s.enabled);
1261 if (err < 0) 1261 if (err < 0)
1262 return err; 1262 return err;
1263 } 1263 }
1264 if (s.mask & AUDIT_STATUS_FAI 1264 if (s.mask & AUDIT_STATUS_FAILURE) {
1265 err = audit_set_failu 1265 err = audit_set_failure(s.failure);
1266 if (err < 0) 1266 if (err < 0)
1267 return err; 1267 return err;
1268 } 1268 }
1269 if (s.mask & AUDIT_STATUS_PID 1269 if (s.mask & AUDIT_STATUS_PID) {
1270 /* NOTE: we are using 1270 /* NOTE: we are using the vnr PID functions below
1271 * because the 1271 * because the s.pid value is relative to the
1272 * namespace of 1272 * namespace of the caller; at present this
1273 * doesn't matt 1273 * doesn't matter much since you can really only
1274 * run auditd f 1274 * run auditd from the initial pid namespace, but
1275 * something to 1275 * something to keep in mind if this changes */
1276 pid_t new_pid = s.pid 1276 pid_t new_pid = s.pid;
1277 pid_t auditd_pid; 1277 pid_t auditd_pid;
1278 struct pid *req_pid = 1278 struct pid *req_pid = task_tgid(current);
1279 1279
1280 /* Sanity check - PID 1280 /* Sanity check - PID values must match. Setting
1281 * pid to 0 is how au 1281 * pid to 0 is how auditd ends auditing. */
1282 if (new_pid && (new_p 1282 if (new_pid && (new_pid != pid_vnr(req_pid)))
1283 return -EINVA 1283 return -EINVAL;
1284 1284
1285 /* test the auditd co 1285 /* test the auditd connection */
1286 audit_replace(req_pid 1286 audit_replace(req_pid);
1287 1287
1288 auditd_pid = auditd_p 1288 auditd_pid = auditd_pid_vnr();
1289 if (auditd_pid) { 1289 if (auditd_pid) {
1290 /* replacing 1290 /* replacing a healthy auditd is not allowed */
1291 if (new_pid) 1291 if (new_pid) {
1292 audit 1292 audit_log_config_change("audit_pid",
1293 1293 new_pid, auditd_pid, 0);
1294 retur 1294 return -EEXIST;
1295 } 1295 }
1296 /* only curre 1296 /* only current auditd can unregister itself */
1297 if (pid_vnr(r 1297 if (pid_vnr(req_pid) != auditd_pid) {
1298 audit 1298 audit_log_config_change("audit_pid",
1299 1299 new_pid, auditd_pid, 0);
1300 retur 1300 return -EACCES;
1301 } 1301 }
1302 } 1302 }
1303 1303
1304 if (new_pid) { 1304 if (new_pid) {
1305 /* register a 1305 /* register a new auditd connection */
1306 err = auditd_ 1306 err = auditd_set(req_pid,
1307 1307 NETLINK_CB(skb).portid,
1308 1308 sock_net(NETLINK_CB(skb).sk),
1309 1309 skb, ack);
1310 if (audit_ena 1310 if (audit_enabled != AUDIT_OFF)
1311 audit 1311 audit_log_config_change("audit_pid",
1312 1312 new_pid,
1313 1313 auditd_pid,
1314 1314 err ? 0 : 1);
1315 if (err) 1315 if (err)
1316 retur 1316 return err;
1317 1317
1318 /* try to pro 1318 /* try to process any backlog */
1319 wake_up_inter 1319 wake_up_interruptible(&kauditd_wait);
1320 } else { 1320 } else {
1321 if (audit_ena 1321 if (audit_enabled != AUDIT_OFF)
1322 audit 1322 audit_log_config_change("audit_pid",
1323 1323 new_pid,
1324 1324 auditd_pid, 1);
1325 1325
1326 /* unregister 1326 /* unregister the auditd connection */
1327 auditd_reset( 1327 auditd_reset(NULL);
1328 } 1328 }
1329 } 1329 }
1330 if (s.mask & AUDIT_STATUS_RAT 1330 if (s.mask & AUDIT_STATUS_RATE_LIMIT) {
1331 err = audit_set_rate_ 1331 err = audit_set_rate_limit(s.rate_limit);
1332 if (err < 0) 1332 if (err < 0)
1333 return err; 1333 return err;
1334 } 1334 }
1335 if (s.mask & AUDIT_STATUS_BAC 1335 if (s.mask & AUDIT_STATUS_BACKLOG_LIMIT) {
1336 err = audit_set_backl 1336 err = audit_set_backlog_limit(s.backlog_limit);
1337 if (err < 0) 1337 if (err < 0)
1338 return err; 1338 return err;
1339 } 1339 }
1340 if (s.mask & AUDIT_STATUS_BAC 1340 if (s.mask & AUDIT_STATUS_BACKLOG_WAIT_TIME) {
1341 if (sizeof(s) > (size 1341 if (sizeof(s) > (size_t)nlh->nlmsg_len)
1342 return -EINVA 1342 return -EINVAL;
1343 if (s.backlog_wait_ti 1343 if (s.backlog_wait_time > 10*AUDIT_BACKLOG_WAIT_TIME)
1344 return -EINVA 1344 return -EINVAL;
1345 err = audit_set_backl 1345 err = audit_set_backlog_wait_time(s.backlog_wait_time);
1346 if (err < 0) 1346 if (err < 0)
1347 return err; 1347 return err;
1348 } 1348 }
1349 if (s.mask == AUDIT_STATUS_LO 1349 if (s.mask == AUDIT_STATUS_LOST) {
1350 u32 lost = atomic_xch 1350 u32 lost = atomic_xchg(&audit_lost, 0);
1351 1351
1352 audit_log_config_chan 1352 audit_log_config_change("lost", 0, lost, 1);
1353 return lost; 1353 return lost;
1354 } 1354 }
1355 if (s.mask == AUDIT_STATUS_BA 1355 if (s.mask == AUDIT_STATUS_BACKLOG_WAIT_TIME_ACTUAL) {
1356 u32 actual = atomic_x 1356 u32 actual = atomic_xchg(&audit_backlog_wait_time_actual, 0);
1357 1357
1358 audit_log_config_chan 1358 audit_log_config_change("backlog_wait_time_actual", 0, actual, 1);
1359 return actual; 1359 return actual;
1360 } 1360 }
1361 break; 1361 break;
1362 } 1362 }
1363 case AUDIT_GET_FEATURE: 1363 case AUDIT_GET_FEATURE:
1364 err = audit_get_feature(skb); 1364 err = audit_get_feature(skb);
1365 if (err) 1365 if (err)
1366 return err; 1366 return err;
1367 break; 1367 break;
1368 case AUDIT_SET_FEATURE: 1368 case AUDIT_SET_FEATURE:
1369 if (data_len < sizeof(struct 1369 if (data_len < sizeof(struct audit_features))
1370 return -EINVAL; 1370 return -EINVAL;
1371 err = audit_set_feature(data) 1371 err = audit_set_feature(data);
1372 if (err) 1372 if (err)
1373 return err; 1373 return err;
1374 break; 1374 break;
1375 case AUDIT_USER: 1375 case AUDIT_USER:
1376 case AUDIT_FIRST_USER_MSG ... AUDIT_L 1376 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
1377 case AUDIT_FIRST_USER_MSG2 ... AUDIT_ 1377 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
1378 if (!audit_enabled && msg_typ 1378 if (!audit_enabled && msg_type != AUDIT_USER_AVC)
1379 return 0; 1379 return 0;
1380 /* exit early if there isn't 1380 /* exit early if there isn't at least one character to print */
1381 if (data_len < 2) 1381 if (data_len < 2)
1382 return -EINVAL; 1382 return -EINVAL;
1383 1383
1384 err = audit_filter(msg_type, 1384 err = audit_filter(msg_type, AUDIT_FILTER_USER);
1385 if (err == 1) { /* match or e 1385 if (err == 1) { /* match or error */
1386 char *str = data; 1386 char *str = data;
1387 1387
1388 err = 0; 1388 err = 0;
1389 if (msg_type == AUDIT 1389 if (msg_type == AUDIT_USER_TTY) {
1390 err = tty_aud 1390 err = tty_audit_push();
1391 if (err) 1391 if (err)
1392 break 1392 break;
1393 } 1393 }
1394 audit_log_user_recv_m 1394 audit_log_user_recv_msg(&ab, msg_type);
1395 if (msg_type != AUDIT 1395 if (msg_type != AUDIT_USER_TTY) {
1396 /* ensure NUL 1396 /* ensure NULL termination */
1397 str[data_len 1397 str[data_len - 1] = '\0';
1398 audit_log_for 1398 audit_log_format(ab, " msg='%.*s'",
1399 1399 AUDIT_MESSAGE_TEXT_MAX,
1400 1400 str);
1401 } else { 1401 } else {
1402 audit_log_for 1402 audit_log_format(ab, " data=");
1403 if (str[data_ 1403 if (str[data_len - 1] == '\0')
1404 data_ 1404 data_len--;
1405 audit_log_n_u 1405 audit_log_n_untrustedstring(ab, str, data_len);
1406 } 1406 }
1407 audit_log_end(ab); 1407 audit_log_end(ab);
1408 } 1408 }
1409 break; 1409 break;
1410 case AUDIT_ADD_RULE: 1410 case AUDIT_ADD_RULE:
1411 case AUDIT_DEL_RULE: 1411 case AUDIT_DEL_RULE:
1412 if (data_len < sizeof(struct 1412 if (data_len < sizeof(struct audit_rule_data))
1413 return -EINVAL; 1413 return -EINVAL;
1414 if (audit_enabled == AUDIT_LO 1414 if (audit_enabled == AUDIT_LOCKED) {
1415 audit_log_common_recv 1415 audit_log_common_recv_msg(audit_context(), &ab,
1416 1416 AUDIT_CONFIG_CHANGE);
1417 audit_log_format(ab, 1417 audit_log_format(ab, " op=%s audit_enabled=%d res=0",
1418 msg_ 1418 msg_type == AUDIT_ADD_RULE ?
1419 1419 "add_rule" : "remove_rule",
1420 audi 1420 audit_enabled);
1421 audit_log_end(ab); 1421 audit_log_end(ab);
1422 return -EPERM; 1422 return -EPERM;
1423 } 1423 }
1424 err = audit_rule_change(msg_t 1424 err = audit_rule_change(msg_type, seq, data, data_len);
1425 break; 1425 break;
1426 case AUDIT_LIST_RULES: 1426 case AUDIT_LIST_RULES:
1427 err = audit_list_rules_send(s 1427 err = audit_list_rules_send(skb, seq);
1428 break; 1428 break;
1429 case AUDIT_TRIM: 1429 case AUDIT_TRIM:
1430 audit_trim_trees(); 1430 audit_trim_trees();
1431 audit_log_common_recv_msg(aud 1431 audit_log_common_recv_msg(audit_context(), &ab,
1432 AUD 1432 AUDIT_CONFIG_CHANGE);
1433 audit_log_format(ab, " op=tri 1433 audit_log_format(ab, " op=trim res=1");
1434 audit_log_end(ab); 1434 audit_log_end(ab);
1435 break; 1435 break;
1436 case AUDIT_MAKE_EQUIV: { 1436 case AUDIT_MAKE_EQUIV: {
1437 void *bufp = data; 1437 void *bufp = data;
1438 u32 sizes[2]; 1438 u32 sizes[2];
1439 size_t msglen = data_len; 1439 size_t msglen = data_len;
1440 char *old, *new; 1440 char *old, *new;
1441 1441
1442 err = -EINVAL; 1442 err = -EINVAL;
1443 if (msglen < 2 * sizeof(u32)) 1443 if (msglen < 2 * sizeof(u32))
1444 break; 1444 break;
1445 memcpy(sizes, bufp, 2 * sizeo 1445 memcpy(sizes, bufp, 2 * sizeof(u32));
1446 bufp += 2 * sizeof(u32); 1446 bufp += 2 * sizeof(u32);
1447 msglen -= 2 * sizeof(u32); 1447 msglen -= 2 * sizeof(u32);
1448 old = audit_unpack_string(&bu 1448 old = audit_unpack_string(&bufp, &msglen, sizes[0]);
1449 if (IS_ERR(old)) { 1449 if (IS_ERR(old)) {
1450 err = PTR_ERR(old); 1450 err = PTR_ERR(old);
1451 break; 1451 break;
1452 } 1452 }
1453 new = audit_unpack_string(&bu 1453 new = audit_unpack_string(&bufp, &msglen, sizes[1]);
1454 if (IS_ERR(new)) { 1454 if (IS_ERR(new)) {
1455 err = PTR_ERR(new); 1455 err = PTR_ERR(new);
1456 kfree(old); 1456 kfree(old);
1457 break; 1457 break;
1458 } 1458 }
1459 /* OK, here comes... */ 1459 /* OK, here comes... */
1460 err = audit_tag_tree(old, new 1460 err = audit_tag_tree(old, new);
1461 1461
1462 audit_log_common_recv_msg(aud 1462 audit_log_common_recv_msg(audit_context(), &ab,
1463 AUD 1463 AUDIT_CONFIG_CHANGE);
1464 audit_log_format(ab, " op=mak 1464 audit_log_format(ab, " op=make_equiv old=");
1465 audit_log_untrustedstring(ab, 1465 audit_log_untrustedstring(ab, old);
1466 audit_log_format(ab, " new=") 1466 audit_log_format(ab, " new=");
1467 audit_log_untrustedstring(ab, 1467 audit_log_untrustedstring(ab, new);
1468 audit_log_format(ab, " res=%d 1468 audit_log_format(ab, " res=%d", !err);
1469 audit_log_end(ab); 1469 audit_log_end(ab);
1470 kfree(old); 1470 kfree(old);
1471 kfree(new); 1471 kfree(new);
1472 break; 1472 break;
1473 } 1473 }
1474 case AUDIT_SIGNAL_INFO: 1474 case AUDIT_SIGNAL_INFO:
1475 len = 0; 1475 len = 0;
1476 if (audit_sig_sid) { 1476 if (audit_sig_sid) {
1477 err = security_secid_ 1477 err = security_secid_to_secctx(audit_sig_sid, &ctx, &len);
1478 if (err) 1478 if (err)
1479 return err; 1479 return err;
1480 } 1480 }
1481 sig_data = kmalloc(struct_siz 1481 sig_data = kmalloc(struct_size(sig_data, ctx, len), GFP_KERNEL);
1482 if (!sig_data) { 1482 if (!sig_data) {
1483 if (audit_sig_sid) 1483 if (audit_sig_sid)
1484 security_rele 1484 security_release_secctx(ctx, len);
1485 return -ENOMEM; 1485 return -ENOMEM;
1486 } 1486 }
1487 sig_data->uid = from_kuid(&in 1487 sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid);
1488 sig_data->pid = audit_sig_pid 1488 sig_data->pid = audit_sig_pid;
1489 if (audit_sig_sid) { 1489 if (audit_sig_sid) {
1490 memcpy(sig_data->ctx, 1490 memcpy(sig_data->ctx, ctx, len);
1491 security_release_secc 1491 security_release_secctx(ctx, len);
1492 } 1492 }
1493 audit_send_reply(skb, seq, AU 1493 audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0,
1494 sig_data, st 1494 sig_data, struct_size(sig_data, ctx, len));
1495 kfree(sig_data); 1495 kfree(sig_data);
1496 break; 1496 break;
1497 case AUDIT_TTY_GET: { 1497 case AUDIT_TTY_GET: {
1498 struct audit_tty_status s; 1498 struct audit_tty_status s;
1499 unsigned int t; 1499 unsigned int t;
1500 1500
1501 t = READ_ONCE(current->signal 1501 t = READ_ONCE(current->signal->audit_tty);
1502 s.enabled = t & AUDIT_TTY_ENA 1502 s.enabled = t & AUDIT_TTY_ENABLE;
1503 s.log_passwd = !!(t & AUDIT_T 1503 s.log_passwd = !!(t & AUDIT_TTY_LOG_PASSWD);
1504 1504
1505 audit_send_reply(skb, seq, AU 1505 audit_send_reply(skb, seq, AUDIT_TTY_GET, 0, 0, &s, sizeof(s));
1506 break; 1506 break;
1507 } 1507 }
1508 case AUDIT_TTY_SET: { 1508 case AUDIT_TTY_SET: {
1509 struct audit_tty_status s, ol 1509 struct audit_tty_status s, old;
1510 struct audit_buffer *ab; 1510 struct audit_buffer *ab;
1511 unsigned int t; 1511 unsigned int t;
1512 1512
1513 memset(&s, 0, sizeof(s)); 1513 memset(&s, 0, sizeof(s));
1514 /* guard against past and fut 1514 /* guard against past and future API changes */
1515 memcpy(&s, data, min_t(size_t 1515 memcpy(&s, data, min_t(size_t, sizeof(s), data_len));
1516 /* check if new data is valid 1516 /* check if new data is valid */
1517 if ((s.enabled != 0 && s.enab 1517 if ((s.enabled != 0 && s.enabled != 1) ||
1518 (s.log_passwd != 0 && s.l 1518 (s.log_passwd != 0 && s.log_passwd != 1))
1519 err = -EINVAL; 1519 err = -EINVAL;
1520 1520
1521 if (err) 1521 if (err)
1522 t = READ_ONCE(current 1522 t = READ_ONCE(current->signal->audit_tty);
1523 else { 1523 else {
1524 t = s.enabled | (-s.l 1524 t = s.enabled | (-s.log_passwd & AUDIT_TTY_LOG_PASSWD);
1525 t = xchg(¤t->si 1525 t = xchg(¤t->signal->audit_tty, t);
1526 } 1526 }
1527 old.enabled = t & AUDIT_TTY_E 1527 old.enabled = t & AUDIT_TTY_ENABLE;
1528 old.log_passwd = !!(t & AUDIT 1528 old.log_passwd = !!(t & AUDIT_TTY_LOG_PASSWD);
1529 1529
1530 audit_log_common_recv_msg(aud 1530 audit_log_common_recv_msg(audit_context(), &ab,
1531 AUD 1531 AUDIT_CONFIG_CHANGE);
1532 audit_log_format(ab, " op=tty 1532 audit_log_format(ab, " op=tty_set old-enabled=%d new-enabled=%d"
1533 " old-log_pa 1533 " old-log_passwd=%d new-log_passwd=%d res=%d",
1534 old.enabled, 1534 old.enabled, s.enabled, old.log_passwd,
1535 s.log_passwd 1535 s.log_passwd, !err);
1536 audit_log_end(ab); 1536 audit_log_end(ab);
1537 break; 1537 break;
1538 } 1538 }
1539 default: 1539 default:
1540 err = -EINVAL; 1540 err = -EINVAL;
1541 break; 1541 break;
1542 } 1542 }
1543 1543
1544 return err < 0 ? err : 0; 1544 return err < 0 ? err : 0;
1545 } 1545 }
1546 1546
1547 /** 1547 /**
1548 * audit_receive - receive messages from a ne 1548 * audit_receive - receive messages from a netlink control socket
1549 * @skb: the message buffer 1549 * @skb: the message buffer
1550 * 1550 *
1551 * Parse the provided skb and deal with any m 1551 * Parse the provided skb and deal with any messages that may be present,
1552 * malformed skbs are discarded. 1552 * malformed skbs are discarded.
1553 */ 1553 */
1554 static void audit_receive(struct sk_buff *skb 1554 static void audit_receive(struct sk_buff *skb)
1555 { 1555 {
1556 struct nlmsghdr *nlh; 1556 struct nlmsghdr *nlh;
1557 bool ack; 1557 bool ack;
1558 /* 1558 /*
1559 * len MUST be signed for nlmsg_next 1559 * len MUST be signed for nlmsg_next to be able to dec it below 0
1560 * if the nlmsg_len was not aligned 1560 * if the nlmsg_len was not aligned
1561 */ 1561 */
1562 int len; 1562 int len;
1563 int err; 1563 int err;
1564 1564
1565 nlh = nlmsg_hdr(skb); 1565 nlh = nlmsg_hdr(skb);
1566 len = skb->len; 1566 len = skb->len;
1567 1567
1568 audit_ctl_lock(); 1568 audit_ctl_lock();
1569 while (nlmsg_ok(nlh, len)) { 1569 while (nlmsg_ok(nlh, len)) {
1570 ack = nlh->nlmsg_flags & NLM_ 1570 ack = nlh->nlmsg_flags & NLM_F_ACK;
1571 err = audit_receive_msg(skb, 1571 err = audit_receive_msg(skb, nlh, &ack);
1572 1572
1573 /* send an ack if the user as 1573 /* send an ack if the user asked for one and audit_receive_msg
1574 * didn't already do it, or i 1574 * didn't already do it, or if there was an error. */
1575 if (ack || err) 1575 if (ack || err)
1576 netlink_ack(skb, nlh, 1576 netlink_ack(skb, nlh, err, NULL);
1577 1577
1578 nlh = nlmsg_next(nlh, &len); 1578 nlh = nlmsg_next(nlh, &len);
1579 } 1579 }
1580 audit_ctl_unlock(); 1580 audit_ctl_unlock();
1581 1581
1582 /* can't block with the ctrl lock, so 1582 /* can't block with the ctrl lock, so penalize the sender now */
1583 if (audit_backlog_limit && 1583 if (audit_backlog_limit &&
1584 (skb_queue_len(&audit_queue) > au 1584 (skb_queue_len(&audit_queue) > audit_backlog_limit)) {
1585 DECLARE_WAITQUEUE(wait, curre 1585 DECLARE_WAITQUEUE(wait, current);
1586 1586
1587 /* wake kauditd to try and fl 1587 /* wake kauditd to try and flush the queue */
1588 wake_up_interruptible(&kaudit 1588 wake_up_interruptible(&kauditd_wait);
1589 1589
1590 add_wait_queue_exclusive(&aud 1590 add_wait_queue_exclusive(&audit_backlog_wait, &wait);
1591 set_current_state(TASK_UNINTE 1591 set_current_state(TASK_UNINTERRUPTIBLE);
1592 schedule_timeout(audit_backlo 1592 schedule_timeout(audit_backlog_wait_time);
1593 remove_wait_queue(&audit_back 1593 remove_wait_queue(&audit_backlog_wait, &wait);
1594 } 1594 }
1595 } 1595 }
1596 1596
1597 /* Log information about who is connecting to 1597 /* Log information about who is connecting to the audit multicast socket */
1598 static void audit_log_multicast(int group, co 1598 static void audit_log_multicast(int group, const char *op, int err)
1599 { 1599 {
1600 const struct cred *cred; 1600 const struct cred *cred;
1601 struct tty_struct *tty; 1601 struct tty_struct *tty;
1602 char comm[sizeof(current->comm)]; 1602 char comm[sizeof(current->comm)];
1603 struct audit_buffer *ab; 1603 struct audit_buffer *ab;
1604 1604
1605 if (!audit_enabled) 1605 if (!audit_enabled)
1606 return; 1606 return;
1607 1607
1608 ab = audit_log_start(audit_context(), 1608 ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_EVENT_LISTENER);
1609 if (!ab) 1609 if (!ab)
1610 return; 1610 return;
1611 1611
1612 cred = current_cred(); 1612 cred = current_cred();
1613 tty = audit_get_tty(); 1613 tty = audit_get_tty();
1614 audit_log_format(ab, "pid=%u uid=%u a 1614 audit_log_format(ab, "pid=%u uid=%u auid=%u tty=%s ses=%u",
1615 task_tgid_nr(current 1615 task_tgid_nr(current),
1616 from_kuid(&init_user 1616 from_kuid(&init_user_ns, cred->uid),
1617 from_kuid(&init_user 1617 from_kuid(&init_user_ns, audit_get_loginuid(current)),
1618 tty ? tty_name(tty) 1618 tty ? tty_name(tty) : "(none)",
1619 audit_get_sessionid( 1619 audit_get_sessionid(current));
1620 audit_put_tty(tty); 1620 audit_put_tty(tty);
1621 audit_log_task_context(ab); /* subj= 1621 audit_log_task_context(ab); /* subj= */
1622 audit_log_format(ab, " comm="); 1622 audit_log_format(ab, " comm=");
1623 audit_log_untrustedstring(ab, get_tas 1623 audit_log_untrustedstring(ab, get_task_comm(comm, current));
1624 audit_log_d_path_exe(ab, current->mm) 1624 audit_log_d_path_exe(ab, current->mm); /* exe= */
1625 audit_log_format(ab, " nl-mcgrp=%d op 1625 audit_log_format(ab, " nl-mcgrp=%d op=%s res=%d", group, op, !err);
1626 audit_log_end(ab); 1626 audit_log_end(ab);
1627 } 1627 }
1628 1628
1629 /* Run custom bind function on netlink socket 1629 /* Run custom bind function on netlink socket group connect or bind requests. */
1630 static int audit_multicast_bind(struct net *n 1630 static int audit_multicast_bind(struct net *net, int group)
1631 { 1631 {
1632 int err = 0; 1632 int err = 0;
1633 1633
1634 if (!capable(CAP_AUDIT_READ)) 1634 if (!capable(CAP_AUDIT_READ))
1635 err = -EPERM; 1635 err = -EPERM;
1636 audit_log_multicast(group, "connect", 1636 audit_log_multicast(group, "connect", err);
1637 return err; 1637 return err;
1638 } 1638 }
1639 1639
1640 static void audit_multicast_unbind(struct net 1640 static void audit_multicast_unbind(struct net *net, int group)
1641 { 1641 {
1642 audit_log_multicast(group, "disconnec 1642 audit_log_multicast(group, "disconnect", 0);
1643 } 1643 }
1644 1644
1645 static int __net_init audit_net_init(struct n 1645 static int __net_init audit_net_init(struct net *net)
1646 { 1646 {
1647 struct netlink_kernel_cfg cfg = { 1647 struct netlink_kernel_cfg cfg = {
1648 .input = audit_receive, 1648 .input = audit_receive,
1649 .bind = audit_multicast_bin 1649 .bind = audit_multicast_bind,
1650 .unbind = audit_multicast_unb 1650 .unbind = audit_multicast_unbind,
1651 .flags = NL_CFG_F_NONROOT_RE 1651 .flags = NL_CFG_F_NONROOT_RECV,
1652 .groups = AUDIT_NLGRP_MAX, 1652 .groups = AUDIT_NLGRP_MAX,
1653 }; 1653 };
1654 1654
1655 struct audit_net *aunet = net_generic 1655 struct audit_net *aunet = net_generic(net, audit_net_id);
1656 1656
1657 aunet->sk = netlink_kernel_create(net 1657 aunet->sk = netlink_kernel_create(net, NETLINK_AUDIT, &cfg);
1658 if (aunet->sk == NULL) { 1658 if (aunet->sk == NULL) {
1659 audit_panic("cannot initializ 1659 audit_panic("cannot initialize netlink socket in namespace");
1660 return -ENOMEM; 1660 return -ENOMEM;
1661 } 1661 }
1662 /* limit the timeout in case auditd i 1662 /* limit the timeout in case auditd is blocked/stopped */
1663 aunet->sk->sk_sndtimeo = HZ / 10; 1663 aunet->sk->sk_sndtimeo = HZ / 10;
1664 1664
1665 return 0; 1665 return 0;
1666 } 1666 }
1667 1667
1668 static void __net_exit audit_net_exit(struct 1668 static void __net_exit audit_net_exit(struct net *net)
1669 { 1669 {
1670 struct audit_net *aunet = net_generic 1670 struct audit_net *aunet = net_generic(net, audit_net_id);
1671 1671
1672 /* NOTE: you would think that we woul 1672 /* NOTE: you would think that we would want to check the auditd
1673 * connection and potentially reset i 1673 * connection and potentially reset it here if it lives in this
1674 * namespace, but since the auditd co 1674 * namespace, but since the auditd connection tracking struct holds a
1675 * reference to this namespace (see a 1675 * reference to this namespace (see auditd_set()) we are only ever
1676 * going to get here after that conne 1676 * going to get here after that connection has been released */
1677 1677
1678 netlink_kernel_release(aunet->sk); 1678 netlink_kernel_release(aunet->sk);
1679 } 1679 }
1680 1680
1681 static struct pernet_operations audit_net_ops 1681 static struct pernet_operations audit_net_ops __net_initdata = {
1682 .init = audit_net_init, 1682 .init = audit_net_init,
1683 .exit = audit_net_exit, 1683 .exit = audit_net_exit,
1684 .id = &audit_net_id, 1684 .id = &audit_net_id,
1685 .size = sizeof(struct audit_net), 1685 .size = sizeof(struct audit_net),
1686 }; 1686 };
1687 1687
1688 /* Initialize audit support at boot time. */ 1688 /* Initialize audit support at boot time. */
1689 static int __init audit_init(void) 1689 static int __init audit_init(void)
1690 { 1690 {
1691 int i; 1691 int i;
1692 1692
1693 if (audit_initialized == AUDIT_DISABL 1693 if (audit_initialized == AUDIT_DISABLED)
1694 return 0; 1694 return 0;
1695 1695
1696 audit_buffer_cache = KMEM_CACHE(audit 1696 audit_buffer_cache = KMEM_CACHE(audit_buffer, SLAB_PANIC);
1697 1697
1698 skb_queue_head_init(&audit_queue); 1698 skb_queue_head_init(&audit_queue);
1699 skb_queue_head_init(&audit_retry_queu 1699 skb_queue_head_init(&audit_retry_queue);
1700 skb_queue_head_init(&audit_hold_queue 1700 skb_queue_head_init(&audit_hold_queue);
1701 1701
1702 for (i = 0; i < AUDIT_INODE_BUCKETS; 1702 for (i = 0; i < AUDIT_INODE_BUCKETS; i++)
1703 INIT_LIST_HEAD(&audit_inode_h 1703 INIT_LIST_HEAD(&audit_inode_hash[i]);
1704 1704
1705 mutex_init(&audit_cmd_mutex.lock); 1705 mutex_init(&audit_cmd_mutex.lock);
1706 audit_cmd_mutex.owner = NULL; 1706 audit_cmd_mutex.owner = NULL;
1707 1707
1708 pr_info("initializing netlink subsys 1708 pr_info("initializing netlink subsys (%s)\n",
1709 str_enabled_disabled(audit_de 1709 str_enabled_disabled(audit_default));
1710 register_pernet_subsys(&audit_net_ops 1710 register_pernet_subsys(&audit_net_ops);
1711 1711
1712 audit_initialized = AUDIT_INITIALIZED 1712 audit_initialized = AUDIT_INITIALIZED;
1713 1713
1714 kauditd_task = kthread_run(kauditd_th 1714 kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd");
1715 if (IS_ERR(kauditd_task)) { 1715 if (IS_ERR(kauditd_task)) {
1716 int err = PTR_ERR(kauditd_tas 1716 int err = PTR_ERR(kauditd_task);
1717 panic("audit: failed to start 1717 panic("audit: failed to start the kauditd thread (%d)\n", err);
1718 } 1718 }
1719 1719
1720 audit_log(NULL, GFP_KERNEL, AUDIT_KER 1720 audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL,
1721 "state=initialized audit_enab 1721 "state=initialized audit_enabled=%u res=1",
1722 audit_enabled); 1722 audit_enabled);
1723 1723
1724 return 0; 1724 return 0;
1725 } 1725 }
1726 postcore_initcall(audit_init); 1726 postcore_initcall(audit_init);
1727 1727
1728 /* 1728 /*
1729 * Process kernel command-line parameter at b 1729 * Process kernel command-line parameter at boot time.
1730 * audit={0|off} or audit={1|on}. 1730 * audit={0|off} or audit={1|on}.
1731 */ 1731 */
1732 static int __init audit_enable(char *str) 1732 static int __init audit_enable(char *str)
1733 { 1733 {
1734 if (!strcasecmp(str, "off") || !strcm 1734 if (!strcasecmp(str, "off") || !strcmp(str, ""))
1735 audit_default = AUDIT_OFF; 1735 audit_default = AUDIT_OFF;
1736 else if (!strcasecmp(str, "on") || !s 1736 else if (!strcasecmp(str, "on") || !strcmp(str, "1"))
1737 audit_default = AUDIT_ON; 1737 audit_default = AUDIT_ON;
1738 else { 1738 else {
1739 pr_err("audit: invalid 'audit 1739 pr_err("audit: invalid 'audit' parameter value (%s)\n", str);
1740 audit_default = AUDIT_ON; 1740 audit_default = AUDIT_ON;
1741 } 1741 }
1742 1742
1743 if (audit_default == AUDIT_OFF) 1743 if (audit_default == AUDIT_OFF)
1744 audit_initialized = AUDIT_DIS 1744 audit_initialized = AUDIT_DISABLED;
1745 if (audit_set_enabled(audit_default)) 1745 if (audit_set_enabled(audit_default))
1746 pr_err("audit: error setting 1746 pr_err("audit: error setting audit state (%d)\n",
1747 audit_default); 1747 audit_default);
1748 1748
1749 pr_info("%s\n", audit_default ? 1749 pr_info("%s\n", audit_default ?
1750 "enabled (after initializatio 1750 "enabled (after initialization)" : "disabled (until reboot)");
1751 1751
1752 return 1; 1752 return 1;
1753 } 1753 }
1754 __setup("audit=", audit_enable); 1754 __setup("audit=", audit_enable);
1755 1755
1756 /* Process kernel command-line parameter at b 1756 /* Process kernel command-line parameter at boot time.
1757 * audit_backlog_limit=<n> */ 1757 * audit_backlog_limit=<n> */
1758 static int __init audit_backlog_limit_set(cha 1758 static int __init audit_backlog_limit_set(char *str)
1759 { 1759 {
1760 u32 audit_backlog_limit_arg; 1760 u32 audit_backlog_limit_arg;
1761 1761
1762 pr_info("audit_backlog_limit: "); 1762 pr_info("audit_backlog_limit: ");
1763 if (kstrtouint(str, 0, &audit_backlog 1763 if (kstrtouint(str, 0, &audit_backlog_limit_arg)) {
1764 pr_cont("using default of %u, 1764 pr_cont("using default of %u, unable to parse %s\n",
1765 audit_backlog_limit, 1765 audit_backlog_limit, str);
1766 return 1; 1766 return 1;
1767 } 1767 }
1768 1768
1769 audit_backlog_limit = audit_backlog_l 1769 audit_backlog_limit = audit_backlog_limit_arg;
1770 pr_cont("%d\n", audit_backlog_limit); 1770 pr_cont("%d\n", audit_backlog_limit);
1771 1771
1772 return 1; 1772 return 1;
1773 } 1773 }
1774 __setup("audit_backlog_limit=", audit_backlog 1774 __setup("audit_backlog_limit=", audit_backlog_limit_set);
1775 1775
1776 static void audit_buffer_free(struct audit_bu 1776 static void audit_buffer_free(struct audit_buffer *ab)
1777 { 1777 {
1778 if (!ab) 1778 if (!ab)
1779 return; 1779 return;
1780 1780
1781 kfree_skb(ab->skb); 1781 kfree_skb(ab->skb);
1782 kmem_cache_free(audit_buffer_cache, a 1782 kmem_cache_free(audit_buffer_cache, ab);
1783 } 1783 }
1784 1784
1785 static struct audit_buffer *audit_buffer_allo 1785 static struct audit_buffer *audit_buffer_alloc(struct audit_context *ctx,
1786 1786 gfp_t gfp_mask, int type)
1787 { 1787 {
1788 struct audit_buffer *ab; 1788 struct audit_buffer *ab;
1789 1789
1790 ab = kmem_cache_alloc(audit_buffer_ca 1790 ab = kmem_cache_alloc(audit_buffer_cache, gfp_mask);
1791 if (!ab) 1791 if (!ab)
1792 return NULL; 1792 return NULL;
1793 1793
1794 ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp 1794 ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp_mask);
1795 if (!ab->skb) 1795 if (!ab->skb)
1796 goto err; 1796 goto err;
1797 if (!nlmsg_put(ab->skb, 0, 0, type, 0 1797 if (!nlmsg_put(ab->skb, 0, 0, type, 0, 0))
1798 goto err; 1798 goto err;
1799 1799
1800 ab->ctx = ctx; 1800 ab->ctx = ctx;
1801 ab->gfp_mask = gfp_mask; 1801 ab->gfp_mask = gfp_mask;
1802 1802
1803 return ab; 1803 return ab;
1804 1804
1805 err: 1805 err:
1806 audit_buffer_free(ab); 1806 audit_buffer_free(ab);
1807 return NULL; 1807 return NULL;
1808 } 1808 }
1809 1809
1810 /** 1810 /**
1811 * audit_serial - compute a serial number for 1811 * audit_serial - compute a serial number for the audit record
1812 * 1812 *
1813 * Compute a serial number for the audit reco 1813 * Compute a serial number for the audit record. Audit records are
1814 * written to user-space as soon as they are 1814 * written to user-space as soon as they are generated, so a complete
1815 * audit record may be written in several pie 1815 * audit record may be written in several pieces. The timestamp of the
1816 * record and this serial number are used by 1816 * record and this serial number are used by the user-space tools to
1817 * determine which pieces belong to the same 1817 * determine which pieces belong to the same audit record. The
1818 * (timestamp,serial) tuple is unique for eac 1818 * (timestamp,serial) tuple is unique for each syscall and is live from
1819 * syscall entry to syscall exit. 1819 * syscall entry to syscall exit.
1820 * 1820 *
1821 * NOTE: Another possibility is to store the 1821 * NOTE: Another possibility is to store the formatted records off the
1822 * audit context (for those records that have 1822 * audit context (for those records that have a context), and emit them
1823 * all at syscall exit. However, this could 1823 * all at syscall exit. However, this could delay the reporting of
1824 * significant errors until syscall exit (or 1824 * significant errors until syscall exit (or never, if the system
1825 * halts). 1825 * halts).
1826 */ 1826 */
1827 unsigned int audit_serial(void) 1827 unsigned int audit_serial(void)
1828 { 1828 {
1829 static atomic_t serial = ATOMIC_INIT( 1829 static atomic_t serial = ATOMIC_INIT(0);
1830 1830
1831 return atomic_inc_return(&serial); 1831 return atomic_inc_return(&serial);
1832 } 1832 }
1833 1833
1834 static inline void audit_get_stamp(struct aud 1834 static inline void audit_get_stamp(struct audit_context *ctx,
1835 struct tim 1835 struct timespec64 *t, unsigned int *serial)
1836 { 1836 {
1837 if (!ctx || !auditsc_get_stamp(ctx, t 1837 if (!ctx || !auditsc_get_stamp(ctx, t, serial)) {
1838 ktime_get_coarse_real_ts64(t) 1838 ktime_get_coarse_real_ts64(t);
1839 *serial = audit_serial(); 1839 *serial = audit_serial();
1840 } 1840 }
1841 } 1841 }
1842 1842
1843 /** 1843 /**
1844 * audit_log_start - obtain an audit buffer 1844 * audit_log_start - obtain an audit buffer
1845 * @ctx: audit_context (may be NULL) 1845 * @ctx: audit_context (may be NULL)
1846 * @gfp_mask: type of allocation 1846 * @gfp_mask: type of allocation
1847 * @type: audit message type 1847 * @type: audit message type
1848 * 1848 *
1849 * Returns audit_buffer pointer on success or 1849 * Returns audit_buffer pointer on success or NULL on error.
1850 * 1850 *
1851 * Obtain an audit buffer. This routine does 1851 * Obtain an audit buffer. This routine does locking to obtain the
1852 * audit buffer, but then no locking is requi 1852 * audit buffer, but then no locking is required for calls to
1853 * audit_log_*format. If the task (ctx) is a 1853 * audit_log_*format. If the task (ctx) is a task that is currently in a
1854 * syscall, then the syscall is marked as aud 1854 * syscall, then the syscall is marked as auditable and an audit record
1855 * will be written at syscall exit. If there 1855 * will be written at syscall exit. If there is no associated task, then
1856 * task context (ctx) should be NULL. 1856 * task context (ctx) should be NULL.
1857 */ 1857 */
1858 struct audit_buffer *audit_log_start(struct a 1858 struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
1859 int type 1859 int type)
1860 { 1860 {
1861 struct audit_buffer *ab; 1861 struct audit_buffer *ab;
1862 struct timespec64 t; 1862 struct timespec64 t;
1863 unsigned int serial; 1863 unsigned int serial;
1864 1864
1865 if (audit_initialized != AUDIT_INITIA 1865 if (audit_initialized != AUDIT_INITIALIZED)
1866 return NULL; 1866 return NULL;
1867 1867
1868 if (unlikely(!audit_filter(type, AUDI 1868 if (unlikely(!audit_filter(type, AUDIT_FILTER_EXCLUDE)))
1869 return NULL; 1869 return NULL;
1870 1870
1871 /* NOTE: don't ever fail/sleep on the 1871 /* NOTE: don't ever fail/sleep on these two conditions:
1872 * 1. auditd generated record - since 1872 * 1. auditd generated record - since we need auditd to drain the
1873 * queue; also, when we are checki 1873 * queue; also, when we are checking for auditd, compare PIDs using
1874 * task_tgid_vnr() since auditd_pi 1874 * task_tgid_vnr() since auditd_pid is set in audit_receive_msg()
1875 * using a PID anchored in the cal 1875 * using a PID anchored in the caller's namespace
1876 * 2. generator holding the audit_cmd 1876 * 2. generator holding the audit_cmd_mutex - we don't want to block
1877 * while holding the mutex, althou 1877 * while holding the mutex, although we do penalize the sender
1878 * later in audit_receive() when i 1878 * later in audit_receive() when it is safe to block
1879 */ 1879 */
1880 if (!(auditd_test_task(current) || au 1880 if (!(auditd_test_task(current) || audit_ctl_owner_current())) {
1881 long stime = audit_backlog_wa 1881 long stime = audit_backlog_wait_time;
1882 1882
1883 while (audit_backlog_limit && 1883 while (audit_backlog_limit &&
1884 (skb_queue_len(&audit_ 1884 (skb_queue_len(&audit_queue) > audit_backlog_limit)) {
1885 /* wake kauditd to tr 1885 /* wake kauditd to try and flush the queue */
1886 wake_up_interruptible 1886 wake_up_interruptible(&kauditd_wait);
1887 1887
1888 /* sleep if we are al 1888 /* sleep if we are allowed and we haven't exhausted our
1889 * backlog wait limit 1889 * backlog wait limit */
1890 if (gfpflags_allow_bl 1890 if (gfpflags_allow_blocking(gfp_mask) && (stime > 0)) {
1891 long rtime = 1891 long rtime = stime;
1892 1892
1893 DECLARE_WAITQ 1893 DECLARE_WAITQUEUE(wait, current);
1894 1894
1895 add_wait_queu 1895 add_wait_queue_exclusive(&audit_backlog_wait,
1896 1896 &wait);
1897 set_current_s 1897 set_current_state(TASK_UNINTERRUPTIBLE);
1898 stime = sched 1898 stime = schedule_timeout(rtime);
1899 atomic_add(rt 1899 atomic_add(rtime - stime, &audit_backlog_wait_time_actual);
1900 remove_wait_q 1900 remove_wait_queue(&audit_backlog_wait, &wait);
1901 } else { 1901 } else {
1902 if (audit_rat 1902 if (audit_rate_check() && printk_ratelimit())
1903 pr_wa 1903 pr_warn("audit_backlog=%d > audit_backlog_limit=%d\n",
1904 1904 skb_queue_len(&audit_queue),
1905 1905 audit_backlog_limit);
1906 audit_log_los 1906 audit_log_lost("backlog limit exceeded");
1907 return NULL; 1907 return NULL;
1908 } 1908 }
1909 } 1909 }
1910 } 1910 }
1911 1911
1912 ab = audit_buffer_alloc(ctx, gfp_mask 1912 ab = audit_buffer_alloc(ctx, gfp_mask, type);
1913 if (!ab) { 1913 if (!ab) {
1914 audit_log_lost("out of memory 1914 audit_log_lost("out of memory in audit_log_start");
1915 return NULL; 1915 return NULL;
1916 } 1916 }
1917 1917
1918 audit_get_stamp(ab->ctx, &t, &serial) 1918 audit_get_stamp(ab->ctx, &t, &serial);
1919 /* cancel dummy context to enable sup 1919 /* cancel dummy context to enable supporting records */
1920 if (ctx) 1920 if (ctx)
1921 ctx->dummy = 0; 1921 ctx->dummy = 0;
1922 audit_log_format(ab, "audit(%llu.%03l 1922 audit_log_format(ab, "audit(%llu.%03lu:%u): ",
1923 (unsigned long long) 1923 (unsigned long long)t.tv_sec, t.tv_nsec/1000000, serial);
1924 1924
1925 return ab; 1925 return ab;
1926 } 1926 }
1927 1927
1928 /** 1928 /**
1929 * audit_expand - expand skb in the audit buf 1929 * audit_expand - expand skb in the audit buffer
1930 * @ab: audit_buffer 1930 * @ab: audit_buffer
1931 * @extra: space to add at tail of the skb 1931 * @extra: space to add at tail of the skb
1932 * 1932 *
1933 * Returns 0 (no space) on failed expansion, 1933 * Returns 0 (no space) on failed expansion, or available space if
1934 * successful. 1934 * successful.
1935 */ 1935 */
1936 static inline int audit_expand(struct audit_b 1936 static inline int audit_expand(struct audit_buffer *ab, int extra)
1937 { 1937 {
1938 struct sk_buff *skb = ab->skb; 1938 struct sk_buff *skb = ab->skb;
1939 int oldtail = skb_tailroom(skb); 1939 int oldtail = skb_tailroom(skb);
1940 int ret = pskb_expand_head(skb, 0, ex 1940 int ret = pskb_expand_head(skb, 0, extra, ab->gfp_mask);
1941 int newtail = skb_tailroom(skb); 1941 int newtail = skb_tailroom(skb);
1942 1942
1943 if (ret < 0) { 1943 if (ret < 0) {
1944 audit_log_lost("out of memory 1944 audit_log_lost("out of memory in audit_expand");
1945 return 0; 1945 return 0;
1946 } 1946 }
1947 1947
1948 skb->truesize += newtail - oldtail; 1948 skb->truesize += newtail - oldtail;
1949 return newtail; 1949 return newtail;
1950 } 1950 }
1951 1951
1952 /* 1952 /*
1953 * Format an audit message into the audit buf 1953 * Format an audit message into the audit buffer. If there isn't enough
1954 * room in the audit buffer, more room will b 1954 * room in the audit buffer, more room will be allocated and vsnprint
1955 * will be called a second time. Currently, 1955 * will be called a second time. Currently, we assume that a printk
1956 * can't format message larger than 1024 byte 1956 * can't format message larger than 1024 bytes, so we don't either.
1957 */ 1957 */
1958 static void audit_log_vformat(struct audit_bu 1958 static void audit_log_vformat(struct audit_buffer *ab, const char *fmt,
1959 va_list args) 1959 va_list args)
1960 { 1960 {
1961 int len, avail; 1961 int len, avail;
1962 struct sk_buff *skb; 1962 struct sk_buff *skb;
1963 va_list args2; 1963 va_list args2;
1964 1964
1965 if (!ab) 1965 if (!ab)
1966 return; 1966 return;
1967 1967
1968 BUG_ON(!ab->skb); 1968 BUG_ON(!ab->skb);
1969 skb = ab->skb; 1969 skb = ab->skb;
1970 avail = skb_tailroom(skb); 1970 avail = skb_tailroom(skb);
1971 if (avail == 0) { 1971 if (avail == 0) {
1972 avail = audit_expand(ab, AUDI 1972 avail = audit_expand(ab, AUDIT_BUFSIZ);
1973 if (!avail) 1973 if (!avail)
1974 goto out; 1974 goto out;
1975 } 1975 }
1976 va_copy(args2, args); 1976 va_copy(args2, args);
1977 len = vsnprintf(skb_tail_pointer(skb) 1977 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args);
1978 if (len >= avail) { 1978 if (len >= avail) {
1979 /* The printk buffer is 1024 1979 /* The printk buffer is 1024 bytes long, so if we get
1980 * here and AUDIT_BUFSIZ is a 1980 * here and AUDIT_BUFSIZ is at least 1024, then we can
1981 * log everything that printk 1981 * log everything that printk could have logged. */
1982 avail = audit_expand(ab, 1982 avail = audit_expand(ab,
1983 max_t(unsigned, AUDIT 1983 max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail));
1984 if (!avail) 1984 if (!avail)
1985 goto out_va_end; 1985 goto out_va_end;
1986 len = vsnprintf(skb_tail_poin 1986 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2);
1987 } 1987 }
1988 if (len > 0) 1988 if (len > 0)
1989 skb_put(skb, len); 1989 skb_put(skb, len);
1990 out_va_end: 1990 out_va_end:
1991 va_end(args2); 1991 va_end(args2);
1992 out: 1992 out:
1993 return; 1993 return;
1994 } 1994 }
1995 1995
1996 /** 1996 /**
1997 * audit_log_format - format a message into t 1997 * audit_log_format - format a message into the audit buffer.
1998 * @ab: audit_buffer 1998 * @ab: audit_buffer
1999 * @fmt: format string 1999 * @fmt: format string
2000 * @...: optional parameters matching @fmt st 2000 * @...: optional parameters matching @fmt string
2001 * 2001 *
2002 * All the work is done in audit_log_vformat. 2002 * All the work is done in audit_log_vformat.
2003 */ 2003 */
2004 void audit_log_format(struct audit_buffer *ab 2004 void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
2005 { 2005 {
2006 va_list args; 2006 va_list args;
2007 2007
2008 if (!ab) 2008 if (!ab)
2009 return; 2009 return;
2010 va_start(args, fmt); 2010 va_start(args, fmt);
2011 audit_log_vformat(ab, fmt, args); 2011 audit_log_vformat(ab, fmt, args);
2012 va_end(args); 2012 va_end(args);
2013 } 2013 }
2014 2014
2015 /** 2015 /**
2016 * audit_log_n_hex - convert a buffer to hex 2016 * audit_log_n_hex - convert a buffer to hex and append it to the audit skb
2017 * @ab: the audit_buffer 2017 * @ab: the audit_buffer
2018 * @buf: buffer to convert to hex 2018 * @buf: buffer to convert to hex
2019 * @len: length of @buf to be converted 2019 * @len: length of @buf to be converted
2020 * 2020 *
2021 * No return value; failure to expand is sile 2021 * No return value; failure to expand is silently ignored.
2022 * 2022 *
2023 * This function will take the passed buf and 2023 * This function will take the passed buf and convert it into a string of
2024 * ascii hex digits. The new string is placed 2024 * ascii hex digits. The new string is placed onto the skb.
2025 */ 2025 */
2026 void audit_log_n_hex(struct audit_buffer *ab, 2026 void audit_log_n_hex(struct audit_buffer *ab, const unsigned char *buf,
2027 size_t len) 2027 size_t len)
2028 { 2028 {
2029 int i, avail, new_len; 2029 int i, avail, new_len;
2030 unsigned char *ptr; 2030 unsigned char *ptr;
2031 struct sk_buff *skb; 2031 struct sk_buff *skb;
2032 2032
2033 if (!ab) 2033 if (!ab)
2034 return; 2034 return;
2035 2035
2036 BUG_ON(!ab->skb); 2036 BUG_ON(!ab->skb);
2037 skb = ab->skb; 2037 skb = ab->skb;
2038 avail = skb_tailroom(skb); 2038 avail = skb_tailroom(skb);
2039 new_len = len<<1; 2039 new_len = len<<1;
2040 if (new_len >= avail) { 2040 if (new_len >= avail) {
2041 /* Round the buffer request u 2041 /* Round the buffer request up to the next multiple */
2042 new_len = AUDIT_BUFSIZ*(((new 2042 new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1);
2043 avail = audit_expand(ab, new_ 2043 avail = audit_expand(ab, new_len);
2044 if (!avail) 2044 if (!avail)
2045 return; 2045 return;
2046 } 2046 }
2047 2047
2048 ptr = skb_tail_pointer(skb); 2048 ptr = skb_tail_pointer(skb);
2049 for (i = 0; i < len; i++) 2049 for (i = 0; i < len; i++)
2050 ptr = hex_byte_pack_upper(ptr 2050 ptr = hex_byte_pack_upper(ptr, buf[i]);
2051 *ptr = 0; 2051 *ptr = 0;
2052 skb_put(skb, len << 1); /* new string 2052 skb_put(skb, len << 1); /* new string is twice the old string */
2053 } 2053 }
2054 2054
2055 /* 2055 /*
2056 * Format a string of no more than slen chara 2056 * Format a string of no more than slen characters into the audit buffer,
2057 * enclosed in quote marks. 2057 * enclosed in quote marks.
2058 */ 2058 */
2059 void audit_log_n_string(struct audit_buffer * 2059 void audit_log_n_string(struct audit_buffer *ab, const char *string,
2060 size_t slen) 2060 size_t slen)
2061 { 2061 {
2062 int avail, new_len; 2062 int avail, new_len;
2063 unsigned char *ptr; 2063 unsigned char *ptr;
2064 struct sk_buff *skb; 2064 struct sk_buff *skb;
2065 2065
2066 if (!ab) 2066 if (!ab)
2067 return; 2067 return;
2068 2068
2069 BUG_ON(!ab->skb); 2069 BUG_ON(!ab->skb);
2070 skb = ab->skb; 2070 skb = ab->skb;
2071 avail = skb_tailroom(skb); 2071 avail = skb_tailroom(skb);
2072 new_len = slen + 3; /* enclosing 2072 new_len = slen + 3; /* enclosing quotes + null terminator */
2073 if (new_len > avail) { 2073 if (new_len > avail) {
2074 avail = audit_expand(ab, new_ 2074 avail = audit_expand(ab, new_len);
2075 if (!avail) 2075 if (!avail)
2076 return; 2076 return;
2077 } 2077 }
2078 ptr = skb_tail_pointer(skb); 2078 ptr = skb_tail_pointer(skb);
2079 *ptr++ = '"'; 2079 *ptr++ = '"';
2080 memcpy(ptr, string, slen); 2080 memcpy(ptr, string, slen);
2081 ptr += slen; 2081 ptr += slen;
2082 *ptr++ = '"'; 2082 *ptr++ = '"';
2083 *ptr = 0; 2083 *ptr = 0;
2084 skb_put(skb, slen + 2); /* don't incl 2084 skb_put(skb, slen + 2); /* don't include null terminator */
2085 } 2085 }
2086 2086
2087 /** 2087 /**
2088 * audit_string_contains_control - does a str 2088 * audit_string_contains_control - does a string need to be logged in hex
2089 * @string: string to be checked 2089 * @string: string to be checked
2090 * @len: max length of the string to check 2090 * @len: max length of the string to check
2091 */ 2091 */
2092 bool audit_string_contains_control(const char 2092 bool audit_string_contains_control(const char *string, size_t len)
2093 { 2093 {
2094 const unsigned char *p; 2094 const unsigned char *p;
2095 for (p = string; p < (const unsigned 2095 for (p = string; p < (const unsigned char *)string + len; p++) {
2096 if (*p == '"' || *p < 0x21 || 2096 if (*p == '"' || *p < 0x21 || *p > 0x7e)
2097 return true; 2097 return true;
2098 } 2098 }
2099 return false; 2099 return false;
2100 } 2100 }
2101 2101
2102 /** 2102 /**
2103 * audit_log_n_untrustedstring - log a string 2103 * audit_log_n_untrustedstring - log a string that may contain random characters
2104 * @ab: audit_buffer 2104 * @ab: audit_buffer
2105 * @len: length of string (not including trai 2105 * @len: length of string (not including trailing null)
2106 * @string: string to be logged 2106 * @string: string to be logged
2107 * 2107 *
2108 * This code will escape a string that is pas 2108 * This code will escape a string that is passed to it if the string
2109 * contains a control character, unprintable 2109 * contains a control character, unprintable character, double quote mark,
2110 * or a space. Unescaped strings will start a 2110 * or a space. Unescaped strings will start and end with a double quote mark.
2111 * Strings that are escaped are printed in he 2111 * Strings that are escaped are printed in hex (2 digits per char).
2112 * 2112 *
2113 * The caller specifies the number of charact 2113 * The caller specifies the number of characters in the string to log, which may
2114 * or may not be the entire string. 2114 * or may not be the entire string.
2115 */ 2115 */
2116 void audit_log_n_untrustedstring(struct audit 2116 void audit_log_n_untrustedstring(struct audit_buffer *ab, const char *string,
2117 size_t len) 2117 size_t len)
2118 { 2118 {
2119 if (audit_string_contains_control(str 2119 if (audit_string_contains_control(string, len))
2120 audit_log_n_hex(ab, string, l 2120 audit_log_n_hex(ab, string, len);
2121 else 2121 else
2122 audit_log_n_string(ab, string 2122 audit_log_n_string(ab, string, len);
2123 } 2123 }
2124 2124
2125 /** 2125 /**
2126 * audit_log_untrustedstring - log a string t 2126 * audit_log_untrustedstring - log a string that may contain random characters
2127 * @ab: audit_buffer 2127 * @ab: audit_buffer
2128 * @string: string to be logged 2128 * @string: string to be logged
2129 * 2129 *
2130 * Same as audit_log_n_untrustedstring(), exc 2130 * Same as audit_log_n_untrustedstring(), except that strlen is used to
2131 * determine string length. 2131 * determine string length.
2132 */ 2132 */
2133 void audit_log_untrustedstring(struct audit_b 2133 void audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
2134 { 2134 {
2135 audit_log_n_untrustedstring(ab, strin 2135 audit_log_n_untrustedstring(ab, string, strlen(string));
2136 } 2136 }
2137 2137
2138 /* This is a helper-function to print the esc 2138 /* This is a helper-function to print the escaped d_path */
2139 void audit_log_d_path(struct audit_buffer *ab 2139 void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
2140 const struct path *path 2140 const struct path *path)
2141 { 2141 {
2142 char *p, *pathname; 2142 char *p, *pathname;
2143 2143
2144 if (prefix) 2144 if (prefix)
2145 audit_log_format(ab, "%s", pr 2145 audit_log_format(ab, "%s", prefix);
2146 2146
2147 /* We will allow 11 spaces for ' (del 2147 /* We will allow 11 spaces for ' (deleted)' to be appended */
2148 pathname = kmalloc(PATH_MAX+11, ab->g 2148 pathname = kmalloc(PATH_MAX+11, ab->gfp_mask);
2149 if (!pathname) { 2149 if (!pathname) {
2150 audit_log_format(ab, "\"<no_m 2150 audit_log_format(ab, "\"<no_memory>\"");
2151 return; 2151 return;
2152 } 2152 }
2153 p = d_path(path, pathname, PATH_MAX+1 2153 p = d_path(path, pathname, PATH_MAX+11);
2154 if (IS_ERR(p)) { /* Should never happ 2154 if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */
2155 /* FIXME: can we save some in 2155 /* FIXME: can we save some information here? */
2156 audit_log_format(ab, "\"<too_ 2156 audit_log_format(ab, "\"<too_long>\"");
2157 } else 2157 } else
2158 audit_log_untrustedstring(ab, 2158 audit_log_untrustedstring(ab, p);
2159 kfree(pathname); 2159 kfree(pathname);
2160 } 2160 }
2161 2161
2162 void audit_log_session_info(struct audit_buff 2162 void audit_log_session_info(struct audit_buffer *ab)
2163 { 2163 {
2164 unsigned int sessionid = audit_get_se 2164 unsigned int sessionid = audit_get_sessionid(current);
2165 uid_t auid = from_kuid(&init_user_ns, 2165 uid_t auid = from_kuid(&init_user_ns, audit_get_loginuid(current));
2166 2166
2167 audit_log_format(ab, "auid=%u ses=%u" 2167 audit_log_format(ab, "auid=%u ses=%u", auid, sessionid);
2168 } 2168 }
2169 2169
2170 void audit_log_key(struct audit_buffer *ab, c 2170 void audit_log_key(struct audit_buffer *ab, char *key)
2171 { 2171 {
2172 audit_log_format(ab, " key="); 2172 audit_log_format(ab, " key=");
2173 if (key) 2173 if (key)
2174 audit_log_untrustedstring(ab, 2174 audit_log_untrustedstring(ab, key);
2175 else 2175 else
2176 audit_log_format(ab, "(null)" 2176 audit_log_format(ab, "(null)");
2177 } 2177 }
2178 2178
2179 int audit_log_task_context(struct audit_buffe 2179 int audit_log_task_context(struct audit_buffer *ab)
2180 { 2180 {
2181 char *ctx = NULL; 2181 char *ctx = NULL;
2182 unsigned len; 2182 unsigned len;
2183 int error; 2183 int error;
2184 u32 sid; 2184 u32 sid;
2185 2185
2186 security_current_getsecid_subj(&sid); 2186 security_current_getsecid_subj(&sid);
2187 if (!sid) 2187 if (!sid)
2188 return 0; 2188 return 0;
2189 2189
2190 error = security_secid_to_secctx(sid, 2190 error = security_secid_to_secctx(sid, &ctx, &len);
2191 if (error) { 2191 if (error) {
2192 if (error != -EINVAL) 2192 if (error != -EINVAL)
2193 goto error_path; 2193 goto error_path;
2194 return 0; 2194 return 0;
2195 } 2195 }
2196 2196
2197 audit_log_format(ab, " subj=%s", ctx) 2197 audit_log_format(ab, " subj=%s", ctx);
2198 security_release_secctx(ctx, len); 2198 security_release_secctx(ctx, len);
2199 return 0; 2199 return 0;
2200 2200
2201 error_path: 2201 error_path:
2202 audit_panic("error in audit_log_task_ 2202 audit_panic("error in audit_log_task_context");
2203 return error; 2203 return error;
2204 } 2204 }
2205 EXPORT_SYMBOL(audit_log_task_context); 2205 EXPORT_SYMBOL(audit_log_task_context);
2206 2206
2207 void audit_log_d_path_exe(struct audit_buffer 2207 void audit_log_d_path_exe(struct audit_buffer *ab,
2208 struct mm_struct *m 2208 struct mm_struct *mm)
2209 { 2209 {
2210 struct file *exe_file; 2210 struct file *exe_file;
2211 2211
2212 if (!mm) 2212 if (!mm)
2213 goto out_null; 2213 goto out_null;
2214 2214
2215 exe_file = get_mm_exe_file(mm); 2215 exe_file = get_mm_exe_file(mm);
2216 if (!exe_file) 2216 if (!exe_file)
2217 goto out_null; 2217 goto out_null;
2218 2218
2219 audit_log_d_path(ab, " exe=", &exe_fi 2219 audit_log_d_path(ab, " exe=", &exe_file->f_path);
2220 fput(exe_file); 2220 fput(exe_file);
2221 return; 2221 return;
2222 out_null: 2222 out_null:
2223 audit_log_format(ab, " exe=(null)"); 2223 audit_log_format(ab, " exe=(null)");
2224 } 2224 }
2225 2225
2226 struct tty_struct *audit_get_tty(void) 2226 struct tty_struct *audit_get_tty(void)
2227 { 2227 {
2228 struct tty_struct *tty = NULL; 2228 struct tty_struct *tty = NULL;
2229 unsigned long flags; 2229 unsigned long flags;
2230 2230
2231 spin_lock_irqsave(¤t->sighand-> 2231 spin_lock_irqsave(¤t->sighand->siglock, flags);
2232 if (current->signal) 2232 if (current->signal)
2233 tty = tty_kref_get(current->s 2233 tty = tty_kref_get(current->signal->tty);
2234 spin_unlock_irqrestore(¤t->sigh 2234 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
2235 return tty; 2235 return tty;
2236 } 2236 }
2237 2237
2238 void audit_put_tty(struct tty_struct *tty) 2238 void audit_put_tty(struct tty_struct *tty)
2239 { 2239 {
2240 tty_kref_put(tty); 2240 tty_kref_put(tty);
2241 } 2241 }
2242 2242
2243 void audit_log_task_info(struct audit_buffer 2243 void audit_log_task_info(struct audit_buffer *ab)
2244 { 2244 {
2245 const struct cred *cred; 2245 const struct cred *cred;
2246 char comm[sizeof(current->comm)]; 2246 char comm[sizeof(current->comm)];
2247 struct tty_struct *tty; 2247 struct tty_struct *tty;
2248 2248
2249 if (!ab) 2249 if (!ab)
2250 return; 2250 return;
2251 2251
2252 cred = current_cred(); 2252 cred = current_cred();
2253 tty = audit_get_tty(); 2253 tty = audit_get_tty();
2254 audit_log_format(ab, 2254 audit_log_format(ab,
2255 " ppid=%d pid=%d aui 2255 " ppid=%d pid=%d auid=%u uid=%u gid=%u"
2256 " euid=%u suid=%u fs 2256 " euid=%u suid=%u fsuid=%u"
2257 " egid=%u sgid=%u fs 2257 " egid=%u sgid=%u fsgid=%u tty=%s ses=%u",
2258 task_ppid_nr(current 2258 task_ppid_nr(current),
2259 task_tgid_nr(current 2259 task_tgid_nr(current),
2260 from_kuid(&init_user 2260 from_kuid(&init_user_ns, audit_get_loginuid(current)),
2261 from_kuid(&init_user 2261 from_kuid(&init_user_ns, cred->uid),
2262 from_kgid(&init_user 2262 from_kgid(&init_user_ns, cred->gid),
2263 from_kuid(&init_user 2263 from_kuid(&init_user_ns, cred->euid),
2264 from_kuid(&init_user 2264 from_kuid(&init_user_ns, cred->suid),
2265 from_kuid(&init_user 2265 from_kuid(&init_user_ns, cred->fsuid),
2266 from_kgid(&init_user 2266 from_kgid(&init_user_ns, cred->egid),
2267 from_kgid(&init_user 2267 from_kgid(&init_user_ns, cred->sgid),
2268 from_kgid(&init_user 2268 from_kgid(&init_user_ns, cred->fsgid),
2269 tty ? tty_name(tty) 2269 tty ? tty_name(tty) : "(none)",
2270 audit_get_sessionid( 2270 audit_get_sessionid(current));
2271 audit_put_tty(tty); 2271 audit_put_tty(tty);
2272 audit_log_format(ab, " comm="); 2272 audit_log_format(ab, " comm=");
2273 audit_log_untrustedstring(ab, get_tas 2273 audit_log_untrustedstring(ab, get_task_comm(comm, current));
2274 audit_log_d_path_exe(ab, current->mm) 2274 audit_log_d_path_exe(ab, current->mm);
2275 audit_log_task_context(ab); 2275 audit_log_task_context(ab);
2276 } 2276 }
2277 EXPORT_SYMBOL(audit_log_task_info); 2277 EXPORT_SYMBOL(audit_log_task_info);
2278 2278
2279 /** 2279 /**
2280 * audit_log_path_denied - report a path rest 2280 * audit_log_path_denied - report a path restriction denial
2281 * @type: audit message type (AUDIT_ANOM_LINK 2281 * @type: audit message type (AUDIT_ANOM_LINK, AUDIT_ANOM_CREAT, etc)
2282 * @operation: specific operation name 2282 * @operation: specific operation name
2283 */ 2283 */
2284 void audit_log_path_denied(int type, const ch 2284 void audit_log_path_denied(int type, const char *operation)
2285 { 2285 {
2286 struct audit_buffer *ab; 2286 struct audit_buffer *ab;
2287 2287
2288 if (!audit_enabled || audit_dummy_con 2288 if (!audit_enabled || audit_dummy_context())
2289 return; 2289 return;
2290 2290
2291 /* Generate log with subject, operati 2291 /* Generate log with subject, operation, outcome. */
2292 ab = audit_log_start(audit_context(), 2292 ab = audit_log_start(audit_context(), GFP_KERNEL, type);
2293 if (!ab) 2293 if (!ab)
2294 return; 2294 return;
2295 audit_log_format(ab, "op=%s", operati 2295 audit_log_format(ab, "op=%s", operation);
2296 audit_log_task_info(ab); 2296 audit_log_task_info(ab);
2297 audit_log_format(ab, " res=0"); 2297 audit_log_format(ab, " res=0");
2298 audit_log_end(ab); 2298 audit_log_end(ab);
2299 } 2299 }
2300 2300
2301 /* global counter which is incremented every 2301 /* global counter which is incremented every time something logs in */
2302 static atomic_t session_id = ATOMIC_INIT(0); 2302 static atomic_t session_id = ATOMIC_INIT(0);
2303 2303
2304 static int audit_set_loginuid_perm(kuid_t log 2304 static int audit_set_loginuid_perm(kuid_t loginuid)
2305 { 2305 {
2306 /* if we are unset, we don't need pri 2306 /* if we are unset, we don't need privs */
2307 if (!audit_loginuid_set(current)) 2307 if (!audit_loginuid_set(current))
2308 return 0; 2308 return 0;
2309 /* if AUDIT_FEATURE_LOGINUID_IMMUTABL 2309 /* if AUDIT_FEATURE_LOGINUID_IMMUTABLE means never ever allow a change*/
2310 if (is_audit_feature_set(AUDIT_FEATUR 2310 if (is_audit_feature_set(AUDIT_FEATURE_LOGINUID_IMMUTABLE))
2311 return -EPERM; 2311 return -EPERM;
2312 /* it is set, you need permission */ 2312 /* it is set, you need permission */
2313 if (!capable(CAP_AUDIT_CONTROL)) 2313 if (!capable(CAP_AUDIT_CONTROL))
2314 return -EPERM; 2314 return -EPERM;
2315 /* reject if this is not an unset and 2315 /* reject if this is not an unset and we don't allow that */
2316 if (is_audit_feature_set(AUDIT_FEATUR 2316 if (is_audit_feature_set(AUDIT_FEATURE_ONLY_UNSET_LOGINUID)
2317 && uid_valid 2317 && uid_valid(loginuid))
2318 return -EPERM; 2318 return -EPERM;
2319 return 0; 2319 return 0;
2320 } 2320 }
2321 2321
2322 static void audit_log_set_loginuid(kuid_t kol 2322 static void audit_log_set_loginuid(kuid_t koldloginuid, kuid_t kloginuid,
2323 unsigned i 2323 unsigned int oldsessionid,
2324 unsigned i 2324 unsigned int sessionid, int rc)
2325 { 2325 {
2326 struct audit_buffer *ab; 2326 struct audit_buffer *ab;
2327 uid_t uid, oldloginuid, loginuid; 2327 uid_t uid, oldloginuid, loginuid;
2328 struct tty_struct *tty; 2328 struct tty_struct *tty;
2329 2329
2330 if (!audit_enabled) 2330 if (!audit_enabled)
2331 return; 2331 return;
2332 2332
2333 ab = audit_log_start(audit_context(), 2333 ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_LOGIN);
2334 if (!ab) 2334 if (!ab)
2335 return; 2335 return;
2336 2336
2337 uid = from_kuid(&init_user_ns, task_u 2337 uid = from_kuid(&init_user_ns, task_uid(current));
2338 oldloginuid = from_kuid(&init_user_ns 2338 oldloginuid = from_kuid(&init_user_ns, koldloginuid);
2339 loginuid = from_kuid(&init_user_ns, k 2339 loginuid = from_kuid(&init_user_ns, kloginuid);
2340 tty = audit_get_tty(); 2340 tty = audit_get_tty();
2341 2341
2342 audit_log_format(ab, "pid=%d uid=%u", 2342 audit_log_format(ab, "pid=%d uid=%u", task_tgid_nr(current), uid);
2343 audit_log_task_context(ab); 2343 audit_log_task_context(ab);
2344 audit_log_format(ab, " old-auid=%u au 2344 audit_log_format(ab, " old-auid=%u auid=%u tty=%s old-ses=%u ses=%u res=%d",
2345 oldloginuid, loginui 2345 oldloginuid, loginuid, tty ? tty_name(tty) : "(none)",
2346 oldsessionid, sessio 2346 oldsessionid, sessionid, !rc);
2347 audit_put_tty(tty); 2347 audit_put_tty(tty);
2348 audit_log_end(ab); 2348 audit_log_end(ab);
2349 } 2349 }
2350 2350
2351 /** 2351 /**
2352 * audit_set_loginuid - set current task's lo 2352 * audit_set_loginuid - set current task's loginuid
2353 * @loginuid: loginuid value 2353 * @loginuid: loginuid value
2354 * 2354 *
2355 * Returns 0. 2355 * Returns 0.
2356 * 2356 *
2357 * Called (set) from fs/proc/base.c::proc_log 2357 * Called (set) from fs/proc/base.c::proc_loginuid_write().
2358 */ 2358 */
2359 int audit_set_loginuid(kuid_t loginuid) 2359 int audit_set_loginuid(kuid_t loginuid)
2360 { 2360 {
2361 unsigned int oldsessionid, sessionid 2361 unsigned int oldsessionid, sessionid = AUDIT_SID_UNSET;
2362 kuid_t oldloginuid; 2362 kuid_t oldloginuid;
2363 int rc; 2363 int rc;
2364 2364
2365 oldloginuid = audit_get_loginuid(curr 2365 oldloginuid = audit_get_loginuid(current);
2366 oldsessionid = audit_get_sessionid(cu 2366 oldsessionid = audit_get_sessionid(current);
2367 2367
2368 rc = audit_set_loginuid_perm(loginuid 2368 rc = audit_set_loginuid_perm(loginuid);
2369 if (rc) 2369 if (rc)
2370 goto out; 2370 goto out;
2371 2371
2372 /* are we setting or clearing? */ 2372 /* are we setting or clearing? */
2373 if (uid_valid(loginuid)) { 2373 if (uid_valid(loginuid)) {
2374 sessionid = (unsigned int)ato 2374 sessionid = (unsigned int)atomic_inc_return(&session_id);
2375 if (unlikely(sessionid == AUD 2375 if (unlikely(sessionid == AUDIT_SID_UNSET))
2376 sessionid = (unsigned 2376 sessionid = (unsigned int)atomic_inc_return(&session_id);
2377 } 2377 }
2378 2378
2379 current->sessionid = sessionid; 2379 current->sessionid = sessionid;
2380 current->loginuid = loginuid; 2380 current->loginuid = loginuid;
2381 out: 2381 out:
2382 audit_log_set_loginuid(oldloginuid, l 2382 audit_log_set_loginuid(oldloginuid, loginuid, oldsessionid, sessionid, rc);
2383 return rc; 2383 return rc;
2384 } 2384 }
2385 2385
2386 /** 2386 /**
2387 * audit_signal_info - record signal info for 2387 * audit_signal_info - record signal info for shutting down audit subsystem
2388 * @sig: signal value 2388 * @sig: signal value
2389 * @t: task being signaled 2389 * @t: task being signaled
2390 * 2390 *
2391 * If the audit subsystem is being terminated 2391 * If the audit subsystem is being terminated, record the task (pid)
2392 * and uid that is doing that. 2392 * and uid that is doing that.
2393 */ 2393 */
2394 int audit_signal_info(int sig, struct task_st 2394 int audit_signal_info(int sig, struct task_struct *t)
2395 { 2395 {
2396 kuid_t uid = current_uid(), auid; 2396 kuid_t uid = current_uid(), auid;
2397 2397
2398 if (auditd_test_task(t) && 2398 if (auditd_test_task(t) &&
2399 (sig == SIGTERM || sig == SIGHUP 2399 (sig == SIGTERM || sig == SIGHUP ||
2400 sig == SIGUSR1 || sig == SIGUSR2 2400 sig == SIGUSR1 || sig == SIGUSR2)) {
2401 audit_sig_pid = task_tgid_nr( 2401 audit_sig_pid = task_tgid_nr(current);
2402 auid = audit_get_loginuid(cur 2402 auid = audit_get_loginuid(current);
2403 if (uid_valid(auid)) 2403 if (uid_valid(auid))
2404 audit_sig_uid = auid; 2404 audit_sig_uid = auid;
2405 else 2405 else
2406 audit_sig_uid = uid; 2406 audit_sig_uid = uid;
2407 security_current_getsecid_sub 2407 security_current_getsecid_subj(&audit_sig_sid);
2408 } 2408 }
2409 2409
2410 return audit_signal_info_syscall(t); 2410 return audit_signal_info_syscall(t);
2411 } 2411 }
2412 2412
2413 /** 2413 /**
2414 * audit_log_end - end one audit record 2414 * audit_log_end - end one audit record
2415 * @ab: the audit_buffer 2415 * @ab: the audit_buffer
2416 * 2416 *
2417 * We can not do a netlink send inside an irq 2417 * We can not do a netlink send inside an irq context because it blocks (last
2418 * arg, flags, is not set to MSG_DONTWAIT), s 2418 * arg, flags, is not set to MSG_DONTWAIT), so the audit buffer is placed on a
2419 * queue and a kthread is scheduled to remove 2419 * queue and a kthread is scheduled to remove them from the queue outside the
2420 * irq context. May be called in any context 2420 * irq context. May be called in any context.
2421 */ 2421 */
2422 void audit_log_end(struct audit_buffer *ab) 2422 void audit_log_end(struct audit_buffer *ab)
2423 { 2423 {
2424 struct sk_buff *skb; 2424 struct sk_buff *skb;
2425 struct nlmsghdr *nlh; 2425 struct nlmsghdr *nlh;
2426 2426
2427 if (!ab) 2427 if (!ab)
2428 return; 2428 return;
2429 2429
2430 if (audit_rate_check()) { 2430 if (audit_rate_check()) {
2431 skb = ab->skb; 2431 skb = ab->skb;
2432 ab->skb = NULL; 2432 ab->skb = NULL;
2433 2433
2434 /* setup the netlink header, 2434 /* setup the netlink header, see the comments in
2435 * kauditd_send_multicast_skb 2435 * kauditd_send_multicast_skb() for length quirks */
2436 nlh = nlmsg_hdr(skb); 2436 nlh = nlmsg_hdr(skb);
2437 nlh->nlmsg_len = skb->len - N 2437 nlh->nlmsg_len = skb->len - NLMSG_HDRLEN;
2438 2438
2439 /* queue the netlink packet a 2439 /* queue the netlink packet and poke the kauditd thread */
2440 skb_queue_tail(&audit_queue, 2440 skb_queue_tail(&audit_queue, skb);
2441 wake_up_interruptible(&kaudit 2441 wake_up_interruptible(&kauditd_wait);
2442 } else 2442 } else
2443 audit_log_lost("rate limit ex 2443 audit_log_lost("rate limit exceeded");
2444 2444
2445 audit_buffer_free(ab); 2445 audit_buffer_free(ab);
2446 } 2446 }
2447 2447
2448 /** 2448 /**
2449 * audit_log - Log an audit record 2449 * audit_log - Log an audit record
2450 * @ctx: audit context 2450 * @ctx: audit context
2451 * @gfp_mask: type of allocation 2451 * @gfp_mask: type of allocation
2452 * @type: audit message type 2452 * @type: audit message type
2453 * @fmt: format string to use 2453 * @fmt: format string to use
2454 * @...: variable parameters matching the for 2454 * @...: variable parameters matching the format string
2455 * 2455 *
2456 * This is a convenience function that calls 2456 * This is a convenience function that calls audit_log_start,
2457 * audit_log_vformat, and audit_log_end. It 2457 * audit_log_vformat, and audit_log_end. It may be called
2458 * in any context. 2458 * in any context.
2459 */ 2459 */
2460 void audit_log(struct audit_context *ctx, gfp 2460 void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
2461 const char *fmt, ...) 2461 const char *fmt, ...)
2462 { 2462 {
2463 struct audit_buffer *ab; 2463 struct audit_buffer *ab;
2464 va_list args; 2464 va_list args;
2465 2465
2466 ab = audit_log_start(ctx, gfp_mask, t 2466 ab = audit_log_start(ctx, gfp_mask, type);
2467 if (ab) { 2467 if (ab) {
2468 va_start(args, fmt); 2468 va_start(args, fmt);
2469 audit_log_vformat(ab, fmt, ar 2469 audit_log_vformat(ab, fmt, args);
2470 va_end(args); 2470 va_end(args);
2471 audit_log_end(ab); 2471 audit_log_end(ab);
2472 } 2472 }
2473 } 2473 }
2474 2474
2475 EXPORT_SYMBOL(audit_log_start); 2475 EXPORT_SYMBOL(audit_log_start);
2476 EXPORT_SYMBOL(audit_log_end); 2476 EXPORT_SYMBOL(audit_log_end);
2477 EXPORT_SYMBOL(audit_log_format); 2477 EXPORT_SYMBOL(audit_log_format);
2478 EXPORT_SYMBOL(audit_log); 2478 EXPORT_SYMBOL(audit_log);
2479 2479
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