1 // SPDX-License-Identifier: GPL-2.0-or-later 1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* 2 /*
3 * Copyright (C) 2016 Namjae Jeon <linkinjeo 3 * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
4 * Copyright (C) 2018 Samsung Electronics Co 4 * Copyright (C) 2018 Samsung Electronics Co., Ltd.
5 */ 5 */
6 6
7 #include "glob.h" 7 #include "glob.h"
8 #include "nterr.h" 8 #include "nterr.h"
9 #include "smb_common.h" 9 #include "smb_common.h"
10 #include "smbstatus.h" 10 #include "smbstatus.h"
11 #include "mgmt/user_session.h" 11 #include "mgmt/user_session.h"
12 #include "connection.h" 12 #include "connection.h"
13 13
14 static int check_smb2_hdr(struct smb2_hdr *hdr 14 static int check_smb2_hdr(struct smb2_hdr *hdr)
15 { 15 {
16 /* 16 /*
17 * Make sure that this really is an SM 17 * Make sure that this really is an SMB, that it is a response.
18 */ 18 */
19 if (hdr->Flags & SMB2_FLAGS_SERVER_TO_ 19 if (hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
20 return 1; 20 return 1;
21 return 0; 21 return 0;
22 } 22 }
23 23
24 /* 24 /*
25 * The following table defines the expected " 25 * The following table defines the expected "StructureSize" of SMB2 requests
26 * in order by SMB2 command. This is similar 26 * in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests.
27 * 27 *
28 * Note that commands are defined in smb2pdu. 28 * Note that commands are defined in smb2pdu.h in le16 but the array below is
29 * indexed by command in host byte order 29 * indexed by command in host byte order
30 */ 30 */
31 static const __le16 smb2_req_struct_sizes[NUMB 31 static const __le16 smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
32 /* SMB2_NEGOTIATE */ cpu_to_le16(36), 32 /* SMB2_NEGOTIATE */ cpu_to_le16(36),
33 /* SMB2_SESSION_SETUP */ cpu_to_le16(2 33 /* SMB2_SESSION_SETUP */ cpu_to_le16(25),
34 /* SMB2_LOGOFF */ cpu_to_le16(4), 34 /* SMB2_LOGOFF */ cpu_to_le16(4),
35 /* SMB2_TREE_CONNECT */ cpu_to_le16(9) 35 /* SMB2_TREE_CONNECT */ cpu_to_le16(9),
36 /* SMB2_TREE_DISCONNECT */ cpu_to_le16 36 /* SMB2_TREE_DISCONNECT */ cpu_to_le16(4),
37 /* SMB2_CREATE */ cpu_to_le16(57), 37 /* SMB2_CREATE */ cpu_to_le16(57),
38 /* SMB2_CLOSE */ cpu_to_le16(24), 38 /* SMB2_CLOSE */ cpu_to_le16(24),
39 /* SMB2_FLUSH */ cpu_to_le16(24), 39 /* SMB2_FLUSH */ cpu_to_le16(24),
40 /* SMB2_READ */ cpu_to_le16(49), 40 /* SMB2_READ */ cpu_to_le16(49),
41 /* SMB2_WRITE */ cpu_to_le16(49), 41 /* SMB2_WRITE */ cpu_to_le16(49),
42 /* SMB2_LOCK */ cpu_to_le16(48), 42 /* SMB2_LOCK */ cpu_to_le16(48),
43 /* SMB2_IOCTL */ cpu_to_le16(57), 43 /* SMB2_IOCTL */ cpu_to_le16(57),
44 /* SMB2_CANCEL */ cpu_to_le16(4), 44 /* SMB2_CANCEL */ cpu_to_le16(4),
45 /* SMB2_ECHO */ cpu_to_le16(4), 45 /* SMB2_ECHO */ cpu_to_le16(4),
46 /* SMB2_QUERY_DIRECTORY */ cpu_to_le16 46 /* SMB2_QUERY_DIRECTORY */ cpu_to_le16(33),
47 /* SMB2_CHANGE_NOTIFY */ cpu_to_le16(3 47 /* SMB2_CHANGE_NOTIFY */ cpu_to_le16(32),
48 /* SMB2_QUERY_INFO */ cpu_to_le16(41), 48 /* SMB2_QUERY_INFO */ cpu_to_le16(41),
49 /* SMB2_SET_INFO */ cpu_to_le16(33), 49 /* SMB2_SET_INFO */ cpu_to_le16(33),
50 /* use 44 for lease break */ 50 /* use 44 for lease break */
51 /* SMB2_OPLOCK_BREAK */ cpu_to_le16(36 51 /* SMB2_OPLOCK_BREAK */ cpu_to_le16(36)
52 }; 52 };
53 53
54 /* 54 /*
55 * The size of the variable area depends on th 55 * The size of the variable area depends on the offset and length fields
56 * located in different fields for various SMB 56 * located in different fields for various SMB2 requests. SMB2 requests
57 * with no variable length info, show an offse 57 * with no variable length info, show an offset of zero for the offset field.
58 */ 58 */
59 static const bool has_smb2_data_area[NUMBER_OF 59 static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
60 /* SMB2_NEGOTIATE */ true, 60 /* SMB2_NEGOTIATE */ true,
61 /* SMB2_SESSION_SETUP */ true, 61 /* SMB2_SESSION_SETUP */ true,
62 /* SMB2_LOGOFF */ false, 62 /* SMB2_LOGOFF */ false,
63 /* SMB2_TREE_CONNECT */ true, 63 /* SMB2_TREE_CONNECT */ true,
64 /* SMB2_TREE_DISCONNECT */ false, 64 /* SMB2_TREE_DISCONNECT */ false,
65 /* SMB2_CREATE */ true, 65 /* SMB2_CREATE */ true,
66 /* SMB2_CLOSE */ false, 66 /* SMB2_CLOSE */ false,
67 /* SMB2_FLUSH */ false, 67 /* SMB2_FLUSH */ false,
68 /* SMB2_READ */ true, 68 /* SMB2_READ */ true,
69 /* SMB2_WRITE */ true, 69 /* SMB2_WRITE */ true,
70 /* SMB2_LOCK */ true, 70 /* SMB2_LOCK */ true,
71 /* SMB2_IOCTL */ true, 71 /* SMB2_IOCTL */ true,
72 /* SMB2_CANCEL */ false, /* BB CHECK t 72 /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
73 /* SMB2_ECHO */ false, 73 /* SMB2_ECHO */ false,
74 /* SMB2_QUERY_DIRECTORY */ true, 74 /* SMB2_QUERY_DIRECTORY */ true,
75 /* SMB2_CHANGE_NOTIFY */ false, 75 /* SMB2_CHANGE_NOTIFY */ false,
76 /* SMB2_QUERY_INFO */ true, 76 /* SMB2_QUERY_INFO */ true,
77 /* SMB2_SET_INFO */ true, 77 /* SMB2_SET_INFO */ true,
78 /* SMB2_OPLOCK_BREAK */ false 78 /* SMB2_OPLOCK_BREAK */ false
79 }; 79 };
80 80
81 /* 81 /*
82 * Set length of the data area and the offset 82 * Set length of the data area and the offset to arguments.
83 * if they are invalid, return error. 83 * if they are invalid, return error.
84 */ 84 */
85 static int smb2_get_data_area_len(unsigned int 85 static int smb2_get_data_area_len(unsigned int *off, unsigned int *len,
86 struct smb2_ 86 struct smb2_hdr *hdr)
87 { 87 {
88 int ret = 0; 88 int ret = 0;
89 89
90 *off = 0; 90 *off = 0;
91 *len = 0; 91 *len = 0;
92 92
93 /* 93 /*
94 * Following commands have data areas 94 * Following commands have data areas so we have to get the location
95 * of the data buffer offset and data 95 * of the data buffer offset and data buffer length for the particular
96 * command. 96 * command.
97 */ 97 */
98 switch (hdr->Command) { 98 switch (hdr->Command) {
99 case SMB2_SESSION_SETUP: 99 case SMB2_SESSION_SETUP:
100 *off = le16_to_cpu(((struct sm 100 *off = le16_to_cpu(((struct smb2_sess_setup_req *)hdr)->SecurityBufferOffset);
101 *len = le16_to_cpu(((struct sm 101 *len = le16_to_cpu(((struct smb2_sess_setup_req *)hdr)->SecurityBufferLength);
102 break; 102 break;
103 case SMB2_TREE_CONNECT: 103 case SMB2_TREE_CONNECT:
104 *off = max_t(unsigned short in 104 *off = max_t(unsigned short int,
105 le16_to_cpu(((str 105 le16_to_cpu(((struct smb2_tree_connect_req *)hdr)->PathOffset),
106 offsetof(struct s 106 offsetof(struct smb2_tree_connect_req, Buffer));
107 *len = le16_to_cpu(((struct sm 107 *len = le16_to_cpu(((struct smb2_tree_connect_req *)hdr)->PathLength);
108 break; 108 break;
109 case SMB2_CREATE: 109 case SMB2_CREATE:
110 { 110 {
111 unsigned short int name_off = 111 unsigned short int name_off =
112 max_t(unsigned short i 112 max_t(unsigned short int,
113 le16_to_cpu(((st 113 le16_to_cpu(((struct smb2_create_req *)hdr)->NameOffset),
114 offsetof(struct 114 offsetof(struct smb2_create_req, Buffer));
115 unsigned short int name_len = 115 unsigned short int name_len =
116 le16_to_cpu(((struct s 116 le16_to_cpu(((struct smb2_create_req *)hdr)->NameLength);
117 117
118 if (((struct smb2_create_req * 118 if (((struct smb2_create_req *)hdr)->CreateContextsLength) {
119 *off = le32_to_cpu(((s 119 *off = le32_to_cpu(((struct smb2_create_req *)
120 hdr)->CreateCo 120 hdr)->CreateContextsOffset);
121 *len = le32_to_cpu(((s 121 *len = le32_to_cpu(((struct smb2_create_req *)
122 hdr)->CreateCo 122 hdr)->CreateContextsLength);
123 if (!name_len) 123 if (!name_len)
124 break; 124 break;
125 125
126 if (name_off + name_le 126 if (name_off + name_len < (u64)*off + *len)
127 break; 127 break;
128 } 128 }
129 129
130 *off = name_off; 130 *off = name_off;
131 *len = name_len; 131 *len = name_len;
132 break; 132 break;
133 } 133 }
134 case SMB2_QUERY_INFO: 134 case SMB2_QUERY_INFO:
135 *off = max_t(unsigned int, 135 *off = max_t(unsigned int,
136 le16_to_cpu(((str 136 le16_to_cpu(((struct smb2_query_info_req *)hdr)->InputBufferOffset),
137 offsetof(struct s 137 offsetof(struct smb2_query_info_req, Buffer));
138 *len = le32_to_cpu(((struct sm 138 *len = le32_to_cpu(((struct smb2_query_info_req *)hdr)->InputBufferLength);
139 break; 139 break;
140 case SMB2_SET_INFO: 140 case SMB2_SET_INFO:
141 *off = max_t(unsigned int, 141 *off = max_t(unsigned int,
142 le16_to_cpu(((str 142 le16_to_cpu(((struct smb2_set_info_req *)hdr)->BufferOffset),
143 offsetof(struct s 143 offsetof(struct smb2_set_info_req, Buffer));
144 *len = le32_to_cpu(((struct sm 144 *len = le32_to_cpu(((struct smb2_set_info_req *)hdr)->BufferLength);
145 break; 145 break;
146 case SMB2_READ: 146 case SMB2_READ:
147 *off = le16_to_cpu(((struct sm 147 *off = le16_to_cpu(((struct smb2_read_req *)hdr)->ReadChannelInfoOffset);
148 *len = le16_to_cpu(((struct sm 148 *len = le16_to_cpu(((struct smb2_read_req *)hdr)->ReadChannelInfoLength);
149 break; 149 break;
150 case SMB2_WRITE: 150 case SMB2_WRITE:
151 if (((struct smb2_write_req *) 151 if (((struct smb2_write_req *)hdr)->DataOffset ||
152 ((struct smb2_write_req *) 152 ((struct smb2_write_req *)hdr)->Length) {
153 *off = max_t(unsigned 153 *off = max_t(unsigned short int,
154 le16_to_c 154 le16_to_cpu(((struct smb2_write_req *)hdr)->DataOffset),
155 offsetof( 155 offsetof(struct smb2_write_req, Buffer));
156 *len = le32_to_cpu(((s 156 *len = le32_to_cpu(((struct smb2_write_req *)hdr)->Length);
157 break; 157 break;
158 } 158 }
159 159
160 *off = le16_to_cpu(((struct sm 160 *off = le16_to_cpu(((struct smb2_write_req *)hdr)->WriteChannelInfoOffset);
161 *len = le16_to_cpu(((struct sm 161 *len = le16_to_cpu(((struct smb2_write_req *)hdr)->WriteChannelInfoLength);
162 break; 162 break;
163 case SMB2_QUERY_DIRECTORY: 163 case SMB2_QUERY_DIRECTORY:
164 *off = max_t(unsigned short in 164 *off = max_t(unsigned short int,
165 le16_to_cpu(((str 165 le16_to_cpu(((struct smb2_query_directory_req *)hdr)->FileNameOffset),
166 offsetof(struct s 166 offsetof(struct smb2_query_directory_req, Buffer));
167 *len = le16_to_cpu(((struct sm 167 *len = le16_to_cpu(((struct smb2_query_directory_req *)hdr)->FileNameLength);
168 break; 168 break;
169 case SMB2_LOCK: 169 case SMB2_LOCK:
170 { 170 {
171 unsigned short lock_count; 171 unsigned short lock_count;
172 172
173 lock_count = le16_to_cpu(((str 173 lock_count = le16_to_cpu(((struct smb2_lock_req *)hdr)->LockCount);
174 if (lock_count > 0) { 174 if (lock_count > 0) {
175 *off = offsetof(struct 175 *off = offsetof(struct smb2_lock_req, locks);
176 *len = sizeof(struct s 176 *len = sizeof(struct smb2_lock_element) * lock_count;
177 } 177 }
178 break; 178 break;
179 } 179 }
180 case SMB2_IOCTL: 180 case SMB2_IOCTL:
181 *off = max_t(unsigned int, 181 *off = max_t(unsigned int,
182 le32_to_cpu(((str 182 le32_to_cpu(((struct smb2_ioctl_req *)hdr)->InputOffset),
183 offsetof(struct s 183 offsetof(struct smb2_ioctl_req, Buffer));
184 *len = le32_to_cpu(((struct sm 184 *len = le32_to_cpu(((struct smb2_ioctl_req *)hdr)->InputCount);
185 break; 185 break;
186 default: 186 default:
187 ksmbd_debug(SMB, "no length ch 187 ksmbd_debug(SMB, "no length check for command\n");
188 break; 188 break;
189 } 189 }
190 190
191 if (*off > 4096) { 191 if (*off > 4096) {
192 ksmbd_debug(SMB, "offset %d to 192 ksmbd_debug(SMB, "offset %d too large\n", *off);
193 ret = -EINVAL; 193 ret = -EINVAL;
194 } else if ((u64)*off + *len > MAX_STRE 194 } else if ((u64)*off + *len > MAX_STREAM_PROT_LEN) {
195 ksmbd_debug(SMB, "Request is l 195 ksmbd_debug(SMB, "Request is larger than maximum stream protocol length(%u): %llu\n",
196 MAX_STREAM_PROT_LE 196 MAX_STREAM_PROT_LEN, (u64)*off + *len);
197 ret = -EINVAL; 197 ret = -EINVAL;
198 } 198 }
199 199
200 return ret; 200 return ret;
201 } 201 }
202 202
203 /* 203 /*
204 * Calculate the size of the SMB message based 204 * Calculate the size of the SMB message based on the fixed header
205 * portion, the number of word parameters and 205 * portion, the number of word parameters and the data portion of the message.
206 */ 206 */
207 static int smb2_calc_size(void *buf, unsigned 207 static int smb2_calc_size(void *buf, unsigned int *len)
208 { 208 {
209 struct smb2_pdu *pdu = (struct smb2_pd 209 struct smb2_pdu *pdu = (struct smb2_pdu *)buf;
210 struct smb2_hdr *hdr = &pdu->hdr; 210 struct smb2_hdr *hdr = &pdu->hdr;
211 unsigned int offset; /* the offset fro 211 unsigned int offset; /* the offset from the beginning of SMB to data area */
212 unsigned int data_length; /* the lengt 212 unsigned int data_length; /* the length of the variable length data area */
213 int ret; 213 int ret;
214 214
215 /* Structure Size has already been che 215 /* Structure Size has already been checked to make sure it is 64 */
216 *len = le16_to_cpu(hdr->StructureSize) 216 *len = le16_to_cpu(hdr->StructureSize);
217 217
218 /* 218 /*
219 * StructureSize2, ie length of fixed 219 * StructureSize2, ie length of fixed parameter area has already
220 * been checked to make sure it is the 220 * been checked to make sure it is the correct length.
221 */ 221 */
222 *len += le16_to_cpu(pdu->StructureSize 222 *len += le16_to_cpu(pdu->StructureSize2);
223 /* 223 /*
224 * StructureSize2 of smb2_lock pdu is 224 * StructureSize2 of smb2_lock pdu is set to 48, indicating
225 * the size of smb2 lock request with 225 * the size of smb2 lock request with single smb2_lock_element
226 * regardless of number of locks. Subt 226 * regardless of number of locks. Subtract single
227 * smb2_lock_element for correct buffe 227 * smb2_lock_element for correct buffer size check.
228 */ 228 */
229 if (hdr->Command == SMB2_LOCK) 229 if (hdr->Command == SMB2_LOCK)
230 *len -= sizeof(struct smb2_loc 230 *len -= sizeof(struct smb2_lock_element);
231 231
232 if (has_smb2_data_area[le16_to_cpu(hdr 232 if (has_smb2_data_area[le16_to_cpu(hdr->Command)] == false)
233 goto calc_size_exit; 233 goto calc_size_exit;
234 234
235 ret = smb2_get_data_area_len(&offset, 235 ret = smb2_get_data_area_len(&offset, &data_length, hdr);
236 if (ret) 236 if (ret)
237 return ret; 237 return ret;
238 ksmbd_debug(SMB, "SMB2 data length %u 238 ksmbd_debug(SMB, "SMB2 data length %u offset %u\n", data_length,
239 offset); 239 offset);
240 240
241 if (data_length > 0) { 241 if (data_length > 0) {
242 /* 242 /*
243 * Check to make sure that dat 243 * Check to make sure that data area begins after fixed area,
244 * Note that last byte of the 244 * Note that last byte of the fixed area is part of data area
245 * for some commands, typicall 245 * for some commands, typically those with odd StructureSize,
246 * so we must add one to the c 246 * so we must add one to the calculation.
247 */ 247 */
248 if (offset + 1 < *len) { 248 if (offset + 1 < *len) {
249 ksmbd_debug(SMB, 249 ksmbd_debug(SMB,
250 "data area 250 "data area offset %d overlaps SMB2 header %u\n",
251 offset + 1 251 offset + 1, *len);
252 return -EINVAL; 252 return -EINVAL;
253 } 253 }
254 254
255 *len = offset + data_length; 255 *len = offset + data_length;
256 } 256 }
257 257
258 calc_size_exit: 258 calc_size_exit:
259 ksmbd_debug(SMB, "SMB2 len %u\n", *len 259 ksmbd_debug(SMB, "SMB2 len %u\n", *len);
260 return 0; 260 return 0;
261 } 261 }
262 262
263 static inline int smb2_query_info_req_len(stru 263 static inline int smb2_query_info_req_len(struct smb2_query_info_req *h)
264 { 264 {
265 return le32_to_cpu(h->InputBufferLengt 265 return le32_to_cpu(h->InputBufferLength) +
266 le32_to_cpu(h->OutputBufferLen 266 le32_to_cpu(h->OutputBufferLength);
267 } 267 }
268 268
269 static inline int smb2_set_info_req_len(struct 269 static inline int smb2_set_info_req_len(struct smb2_set_info_req *h)
270 { 270 {
271 return le32_to_cpu(h->BufferLength); 271 return le32_to_cpu(h->BufferLength);
272 } 272 }
273 273
274 static inline int smb2_read_req_len(struct smb 274 static inline int smb2_read_req_len(struct smb2_read_req *h)
275 { 275 {
276 return le32_to_cpu(h->Length); 276 return le32_to_cpu(h->Length);
277 } 277 }
278 278
279 static inline int smb2_write_req_len(struct sm 279 static inline int smb2_write_req_len(struct smb2_write_req *h)
280 { 280 {
281 return le32_to_cpu(h->Length); 281 return le32_to_cpu(h->Length);
282 } 282 }
283 283
284 static inline int smb2_query_dir_req_len(struc 284 static inline int smb2_query_dir_req_len(struct smb2_query_directory_req *h)
285 { 285 {
286 return le32_to_cpu(h->OutputBufferLeng 286 return le32_to_cpu(h->OutputBufferLength);
287 } 287 }
288 288
289 static inline int smb2_ioctl_req_len(struct sm 289 static inline int smb2_ioctl_req_len(struct smb2_ioctl_req *h)
290 { 290 {
291 return le32_to_cpu(h->InputCount) + 291 return le32_to_cpu(h->InputCount) +
292 le32_to_cpu(h->OutputCount); 292 le32_to_cpu(h->OutputCount);
293 } 293 }
294 294
295 static inline int smb2_ioctl_resp_len(struct s 295 static inline int smb2_ioctl_resp_len(struct smb2_ioctl_req *h)
296 { 296 {
297 return le32_to_cpu(h->MaxInputResponse 297 return le32_to_cpu(h->MaxInputResponse) +
298 le32_to_cpu(h->MaxOutputRespon 298 le32_to_cpu(h->MaxOutputResponse);
299 } 299 }
300 300
301 static int smb2_validate_credit_charge(struct 301 static int smb2_validate_credit_charge(struct ksmbd_conn *conn,
302 struct 302 struct smb2_hdr *hdr)
303 { 303 {
304 unsigned int req_len = 0, expect_resp_ 304 unsigned int req_len = 0, expect_resp_len = 0, calc_credit_num, max_len;
305 unsigned short credit_charge = le16_to 305 unsigned short credit_charge = le16_to_cpu(hdr->CreditCharge);
306 void *__hdr = hdr; 306 void *__hdr = hdr;
307 int ret = 0; 307 int ret = 0;
308 308
309 switch (hdr->Command) { 309 switch (hdr->Command) {
310 case SMB2_QUERY_INFO: 310 case SMB2_QUERY_INFO:
311 req_len = smb2_query_info_req_ 311 req_len = smb2_query_info_req_len(__hdr);
312 break; 312 break;
313 case SMB2_SET_INFO: 313 case SMB2_SET_INFO:
314 req_len = smb2_set_info_req_le 314 req_len = smb2_set_info_req_len(__hdr);
315 break; 315 break;
316 case SMB2_READ: 316 case SMB2_READ:
317 req_len = smb2_read_req_len(__ 317 req_len = smb2_read_req_len(__hdr);
318 break; 318 break;
319 case SMB2_WRITE: 319 case SMB2_WRITE:
320 req_len = smb2_write_req_len(_ 320 req_len = smb2_write_req_len(__hdr);
321 break; 321 break;
322 case SMB2_QUERY_DIRECTORY: 322 case SMB2_QUERY_DIRECTORY:
323 req_len = smb2_query_dir_req_l 323 req_len = smb2_query_dir_req_len(__hdr);
324 break; 324 break;
325 case SMB2_IOCTL: 325 case SMB2_IOCTL:
326 req_len = smb2_ioctl_req_len(_ 326 req_len = smb2_ioctl_req_len(__hdr);
327 expect_resp_len = smb2_ioctl_r 327 expect_resp_len = smb2_ioctl_resp_len(__hdr);
328 break; 328 break;
329 case SMB2_CANCEL: 329 case SMB2_CANCEL:
330 return 0; 330 return 0;
331 default: 331 default:
332 req_len = 1; 332 req_len = 1;
333 break; 333 break;
334 } 334 }
335 335
336 credit_charge = max_t(unsigned short, 336 credit_charge = max_t(unsigned short, credit_charge, 1);
337 max_len = max_t(unsigned int, req_len, 337 max_len = max_t(unsigned int, req_len, expect_resp_len);
338 calc_credit_num = DIV_ROUND_UP(max_len 338 calc_credit_num = DIV_ROUND_UP(max_len, SMB2_MAX_BUFFER_SIZE);
339 339
340 if (credit_charge < calc_credit_num) { 340 if (credit_charge < calc_credit_num) {
341 ksmbd_debug(SMB, "Insufficient 341 ksmbd_debug(SMB, "Insufficient credit charge, given: %d, needed: %d\n",
342 credit_charge, cal 342 credit_charge, calc_credit_num);
343 return 1; 343 return 1;
344 } else if (credit_charge > conn->vals- 344 } else if (credit_charge > conn->vals->max_credits) {
345 ksmbd_debug(SMB, "Too large cr 345 ksmbd_debug(SMB, "Too large credit charge: %d\n", credit_charge);
346 return 1; 346 return 1;
347 } 347 }
348 348
349 spin_lock(&conn->credits_lock); 349 spin_lock(&conn->credits_lock);
350 if (credit_charge > conn->total_credit 350 if (credit_charge > conn->total_credits) {
351 ksmbd_debug(SMB, "Insufficient 351 ksmbd_debug(SMB, "Insufficient credits granted, given: %u, granted: %u\n",
352 credit_charge, con 352 credit_charge, conn->total_credits);
353 ret = 1; 353 ret = 1;
354 } 354 }
355 355
356 if ((u64)conn->outstanding_credits + c 356 if ((u64)conn->outstanding_credits + credit_charge > conn->total_credits) {
357 ksmbd_debug(SMB, "Limits excee 357 ksmbd_debug(SMB, "Limits exceeding the maximum allowable outstanding requests, given : %u, pending : %u\n",
358 credit_charge, con 358 credit_charge, conn->outstanding_credits);
359 ret = 1; 359 ret = 1;
360 } else 360 } else
361 conn->outstanding_credits += c 361 conn->outstanding_credits += credit_charge;
362 362
363 spin_unlock(&conn->credits_lock); 363 spin_unlock(&conn->credits_lock);
364 364
365 return ret; 365 return ret;
366 } 366 }
367 367
368 int ksmbd_smb2_check_message(struct ksmbd_work 368 int ksmbd_smb2_check_message(struct ksmbd_work *work)
369 { 369 {
370 struct smb2_pdu *pdu = ksmbd_req_buf_n 370 struct smb2_pdu *pdu = ksmbd_req_buf_next(work);
371 struct smb2_hdr *hdr = &pdu->hdr; 371 struct smb2_hdr *hdr = &pdu->hdr;
372 int command; 372 int command;
373 __u32 clc_len; /* calculated length * 373 __u32 clc_len; /* calculated length */
374 __u32 len = get_rfc1002_len(work->requ 374 __u32 len = get_rfc1002_len(work->request_buf);
375 __u32 req_struct_size, next_cmd = le32 375 __u32 req_struct_size, next_cmd = le32_to_cpu(hdr->NextCommand);
376 376
377 if ((u64)work->next_smb2_rcv_hdr_off + 377 if ((u64)work->next_smb2_rcv_hdr_off + next_cmd > len) {
378 pr_err("next command(%u) offse 378 pr_err("next command(%u) offset exceeds smb msg size\n",
379 next_cmd); 379 next_cmd);
380 return 1; 380 return 1;
381 } 381 }
382 382
383 if (next_cmd > 0) 383 if (next_cmd > 0)
384 len = next_cmd; 384 len = next_cmd;
385 else if (work->next_smb2_rcv_hdr_off) 385 else if (work->next_smb2_rcv_hdr_off)
386 len -= work->next_smb2_rcv_hdr 386 len -= work->next_smb2_rcv_hdr_off;
387 387
388 if (check_smb2_hdr(hdr)) 388 if (check_smb2_hdr(hdr))
389 return 1; 389 return 1;
390 390
391 if (hdr->StructureSize != SMB2_HEADER_ 391 if (hdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
392 ksmbd_debug(SMB, "Illegal stru 392 ksmbd_debug(SMB, "Illegal structure size %u\n",
393 le16_to_cpu(hdr->S 393 le16_to_cpu(hdr->StructureSize));
394 return 1; 394 return 1;
395 } 395 }
396 396
397 command = le16_to_cpu(hdr->Command); 397 command = le16_to_cpu(hdr->Command);
398 if (command >= NUMBER_OF_SMB2_COMMANDS 398 if (command >= NUMBER_OF_SMB2_COMMANDS) {
399 ksmbd_debug(SMB, "Illegal SMB2 399 ksmbd_debug(SMB, "Illegal SMB2 command %d\n", command);
400 return 1; 400 return 1;
401 } 401 }
402 402
403 if (smb2_req_struct_sizes[command] != 403 if (smb2_req_struct_sizes[command] != pdu->StructureSize2) {
404 if (!(command == SMB2_OPLOCK_B 404 if (!(command == SMB2_OPLOCK_BREAK_HE &&
405 (le16_to_cpu(pdu->Structur 405 (le16_to_cpu(pdu->StructureSize2) == OP_BREAK_STRUCT_SIZE_20 ||
406 le16_to_cpu(pdu->Structure 406 le16_to_cpu(pdu->StructureSize2) == OP_BREAK_STRUCT_SIZE_21))) {
407 /* special case for SM 407 /* special case for SMB2.1 lease break message */
408 ksmbd_debug(SMB, 408 ksmbd_debug(SMB,
409 "Illegal reque 409 "Illegal request size %u for command %d\n",
410 le16_to_cpu(pd 410 le16_to_cpu(pdu->StructureSize2), command);
411 return 1; 411 return 1;
412 } 412 }
413 } 413 }
414 414
415 req_struct_size = le16_to_cpu(pdu->Str 415 req_struct_size = le16_to_cpu(pdu->StructureSize2) +
416 __SMB2_HEADER_STRUCTURE_SIZE; 416 __SMB2_HEADER_STRUCTURE_SIZE;
417 if (command == SMB2_LOCK_HE) 417 if (command == SMB2_LOCK_HE)
418 req_struct_size -= sizeof(stru 418 req_struct_size -= sizeof(struct smb2_lock_element);
419 419
420 if (req_struct_size > len + 1) 420 if (req_struct_size > len + 1)
421 return 1; 421 return 1;
422 422
423 if (smb2_calc_size(hdr, &clc_len)) 423 if (smb2_calc_size(hdr, &clc_len))
424 return 1; 424 return 1;
425 425
426 if (len != clc_len) { 426 if (len != clc_len) {
427 /* client can return one byte 427 /* client can return one byte more due to implied bcc[0] */
428 if (clc_len == len + 1) 428 if (clc_len == len + 1)
429 goto validate_credit; 429 goto validate_credit;
430 430
431 /* 431 /*
432 * Some windows servers (win20 432 * Some windows servers (win2016) will pad also the final
433 * PDU in a compound to 8 byte 433 * PDU in a compound to 8 bytes.
434 */ 434 */
435 if (ALIGN(clc_len, 8) == len) 435 if (ALIGN(clc_len, 8) == len)
436 goto validate_credit; 436 goto validate_credit;
437 437
438 /* 438 /*
439 * SMB2 NEGOTIATE request will 439 * SMB2 NEGOTIATE request will be validated when message
440 * handling proceeds. 440 * handling proceeds.
441 */ 441 */
442 if (command == SMB2_NEGOTIATE_ 442 if (command == SMB2_NEGOTIATE_HE)
443 goto validate_credit; 443 goto validate_credit;
444 444
445 /* 445 /*
446 * Allow a message that padded 446 * Allow a message that padded to 8byte boundary.
447 * Linux 4.19.217 with smb 3.0 447 * Linux 4.19.217 with smb 3.0.2 are sometimes
448 * sending messages where the 448 * sending messages where the cls_len is exactly
449 * 8 bytes less than len. 449 * 8 bytes less than len.
450 */ 450 */
451 if (clc_len < len && (len - cl 451 if (clc_len < len && (len - clc_len) <= 8)
452 goto validate_credit; 452 goto validate_credit;
453 453
454 pr_err_ratelimited( 454 pr_err_ratelimited(
455 "cli req too short 455 "cli req too short, len %d not %d. cmd:%d mid:%llu\n",
456 len, clc_len, comm 456 len, clc_len, command,
457 le64_to_cpu(hdr->M 457 le64_to_cpu(hdr->MessageId));
458 458
459 return 1; 459 return 1;
460 } 460 }
461 461
462 validate_credit: 462 validate_credit:
463 if ((work->conn->vals->capabilities & 463 if ((work->conn->vals->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU) &&
464 smb2_validate_credit_charge(work-> 464 smb2_validate_credit_charge(work->conn, hdr))
465 return 1; 465 return 1;
466 466
467 return 0; 467 return 0;
468 } 468 }
469 469
470 int smb2_negotiate_request(struct ksmbd_work * 470 int smb2_negotiate_request(struct ksmbd_work *work)
471 { 471 {
472 return ksmbd_smb_negotiate_common(work 472 return ksmbd_smb_negotiate_common(work, SMB2_NEGOTIATE_HE);
473 } 473 }
474 474
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