1 // SPDX-License-Identifier: GPL-2.0-or-later
2
3 /*
4 * PARISC specific syscalls
5 *
6 * Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
7 * Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
8 * Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>
9 * Copyright (C) 1999-2020 Helge Deller <deller@gmx.de>
10 */
11
12 #include <linux/uaccess.h>
13 #include <asm/elf.h>
14 #include <linux/file.h>
15 #include <linux/fs.h>
16 #include <linux/linkage.h>
17 #include <linux/mm.h>
18 #include <linux/mman.h>
19 #include <linux/sched/signal.h>
20 #include <linux/sched/mm.h>
21 #include <linux/shm.h>
22 #include <linux/syscalls.h>
23 #include <linux/utsname.h>
24 #include <linux/personality.h>
25 #include <linux/random.h>
26 #include <linux/compat.h>
27 #include <linux/elf-randomize.h>
28
29 /*
30 * Construct an artificial page offset for the mapping based on the physical
31 * address of the kernel file mapping variable.
32 */
33 #define GET_FILP_PGOFF(filp) \
34 (filp ? (((unsigned long) filp->f_mapping) >> 8) \
35 & ((SHM_COLOUR-1) >> PAGE_SHIFT) : 0UL)
36
37 static unsigned long shared_align_offset(unsigned long filp_pgoff,
38 unsigned long pgoff)
39 {
40 return (filp_pgoff + pgoff) << PAGE_SHIFT;
41 }
42
43 static inline unsigned long COLOR_ALIGN(unsigned long addr,
44 unsigned long filp_pgoff, unsigned long pgoff)
45 {
46 unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1);
47 unsigned long off = (SHM_COLOUR-1) &
48 shared_align_offset(filp_pgoff, pgoff);
49 return base + off;
50 }
51
52
53 #define STACK_SIZE_DEFAULT (USER_WIDE_MODE \
54 ? (1 << 30) /* 1 GB */ \
55 : (CONFIG_STACK_MAX_DEFAULT_SIZE_MB*1024*1024))
56
57 unsigned long calc_max_stack_size(unsigned long stack_max)
58 {
59 #ifdef CONFIG_COMPAT
60 if (!USER_WIDE_MODE && (stack_max == COMPAT_RLIM_INFINITY))
61 stack_max = STACK_SIZE_DEFAULT;
62 else
63 #endif
64 if (stack_max == RLIM_INFINITY)
65 stack_max = STACK_SIZE_DEFAULT;
66
67 return stack_max;
68 }
69
70
71 /*
72 * Top of mmap area (just below the process stack).
73 */
74
75 /*
76 * When called from arch_get_unmapped_area(), rlim_stack will be NULL,
77 * indicating that "current" should be used instead of a passed-in
78 * value from the exec bprm as done with arch_pick_mmap_layout().
79 */
80 unsigned long mmap_upper_limit(struct rlimit *rlim_stack)
81 {
82 unsigned long stack_base;
83
84 /* Limit stack size - see setup_arg_pages() in fs/exec.c */
85 stack_base = rlim_stack ? rlim_stack->rlim_max
86 : rlimit_max(RLIMIT_STACK);
87
88 stack_base = calc_max_stack_size(stack_base);
89
90 /* Add space for stack randomization. */
91 if (current->flags & PF_RANDOMIZE)
92 stack_base += (STACK_RND_MASK << PAGE_SHIFT);
93
94 return PAGE_ALIGN(STACK_TOP - stack_base);
95 }
96
97 enum mmap_allocation_direction {UP, DOWN};
98
99 static unsigned long arch_get_unmapped_area_common(struct file *filp,
100 unsigned long addr, unsigned long len, unsigned long pgoff,
101 unsigned long flags, enum mmap_allocation_direction dir)
102 {
103 struct mm_struct *mm = current->mm;
104 struct vm_area_struct *vma, *prev;
105 unsigned long filp_pgoff;
106 int do_color_align;
107 struct vm_unmapped_area_info info = {
108 .length = len
109 };
110
111 if (unlikely(len > TASK_SIZE))
112 return -ENOMEM;
113
114 do_color_align = 0;
115 if (filp || (flags & MAP_SHARED))
116 do_color_align = 1;
117 filp_pgoff = GET_FILP_PGOFF(filp);
118
119 if (flags & MAP_FIXED) {
120 /* Even MAP_FIXED mappings must reside within TASK_SIZE */
121 if (TASK_SIZE - len < addr)
122 return -EINVAL;
123
124 if ((flags & MAP_SHARED) && filp &&
125 (addr - shared_align_offset(filp_pgoff, pgoff))
126 & (SHM_COLOUR - 1))
127 return -EINVAL;
128 return addr;
129 }
130
131 if (addr) {
132 if (do_color_align)
133 addr = COLOR_ALIGN(addr, filp_pgoff, pgoff);
134 else
135 addr = PAGE_ALIGN(addr);
136
137 vma = find_vma_prev(mm, addr, &prev);
138 if (TASK_SIZE - len >= addr &&
139 (!vma || addr + len <= vm_start_gap(vma)) &&
140 (!prev || addr >= vm_end_gap(prev)))
141 return addr;
142 }
143
144 info.align_mask = do_color_align ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
145 info.align_offset = shared_align_offset(filp_pgoff, pgoff);
146
147 if (dir == DOWN) {
148 info.flags = VM_UNMAPPED_AREA_TOPDOWN;
149 info.low_limit = PAGE_SIZE;
150 info.high_limit = mm->mmap_base;
151 addr = vm_unmapped_area(&info);
152 if (!(addr & ~PAGE_MASK))
153 return addr;
154 VM_BUG_ON(addr != -ENOMEM);
155
156 /*
157 * A failed mmap() very likely causes application failure,
158 * so fall back to the bottom-up function here. This scenario
159 * can happen with large stack limits and large mmap()
160 * allocations.
161 */
162 }
163
164 info.low_limit = mm->mmap_base;
165 info.high_limit = mmap_upper_limit(NULL);
166 return vm_unmapped_area(&info);
167 }
168
169 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
170 unsigned long len, unsigned long pgoff, unsigned long flags)
171 {
172 return arch_get_unmapped_area_common(filp,
173 addr, len, pgoff, flags, UP);
174 }
175
176 unsigned long arch_get_unmapped_area_topdown(struct file *filp,
177 unsigned long addr, unsigned long len, unsigned long pgoff,
178 unsigned long flags)
179 {
180 return arch_get_unmapped_area_common(filp,
181 addr, len, pgoff, flags, DOWN);
182 }
183
184 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
185 unsigned long prot, unsigned long flags, unsigned long fd,
186 unsigned long pgoff)
187 {
188 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
189 we have. */
190 return ksys_mmap_pgoff(addr, len, prot, flags, fd,
191 pgoff >> (PAGE_SHIFT - 12));
192 }
193
194 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
195 unsigned long prot, unsigned long flags, unsigned long fd,
196 unsigned long offset)
197 {
198 if (!(offset & ~PAGE_MASK)) {
199 return ksys_mmap_pgoff(addr, len, prot, flags, fd,
200 offset >> PAGE_SHIFT);
201 } else {
202 return -EINVAL;
203 }
204 }
205
206 /* Fucking broken ABI */
207
208 #ifdef CONFIG_64BIT
209 asmlinkage long parisc_truncate64(const char __user * path,
210 unsigned int high, unsigned int low)
211 {
212 return ksys_truncate(path, (long)high << 32 | low);
213 }
214
215 asmlinkage long parisc_ftruncate64(unsigned int fd,
216 unsigned int high, unsigned int low)
217 {
218 return ksys_ftruncate(fd, (long)high << 32 | low);
219 }
220
221 /* stubs for the benefit of the syscall_table since truncate64 and truncate
222 * are identical on LP64 */
223 asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
224 {
225 return ksys_truncate(path, length);
226 }
227 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
228 {
229 return ksys_ftruncate(fd, length);
230 }
231 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
232 {
233 return sys_fcntl(fd, cmd, arg);
234 }
235 #else
236
237 asmlinkage long parisc_truncate64(const char __user * path,
238 unsigned int high, unsigned int low)
239 {
240 return ksys_truncate(path, (loff_t)high << 32 | low);
241 }
242
243 asmlinkage long parisc_ftruncate64(unsigned int fd,
244 unsigned int high, unsigned int low)
245 {
246 return sys_ftruncate64(fd, (loff_t)high << 32 | low);
247 }
248 #endif
249
250 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count,
251 unsigned int high, unsigned int low)
252 {
253 return ksys_pread64(fd, buf, count, (loff_t)high << 32 | low);
254 }
255
256 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf,
257 size_t count, unsigned int high, unsigned int low)
258 {
259 return ksys_pwrite64(fd, buf, count, (loff_t)high << 32 | low);
260 }
261
262 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low,
263 size_t count)
264 {
265 return ksys_readahead(fd, (loff_t)high << 32 | low, count);
266 }
267
268 asmlinkage long parisc_fadvise64_64(int fd,
269 unsigned int high_off, unsigned int low_off,
270 unsigned int high_len, unsigned int low_len, int advice)
271 {
272 return ksys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off,
273 (loff_t)high_len << 32 | low_len, advice);
274 }
275
276 asmlinkage long parisc_sync_file_range(int fd,
277 u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes,
278 unsigned int flags)
279 {
280 return ksys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off,
281 (loff_t)hi_nbytes << 32 | lo_nbytes, flags);
282 }
283
284 asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo,
285 u32 lenhi, u32 lenlo)
286 {
287 return ksys_fallocate(fd, mode, ((u64)offhi << 32) | offlo,
288 ((u64)lenhi << 32) | lenlo);
289 }
290
291 asmlinkage long parisc_personality(unsigned long personality)
292 {
293 long err;
294
295 if (personality(current->personality) == PER_LINUX32
296 && personality(personality) == PER_LINUX)
297 personality = (personality & ~PER_MASK) | PER_LINUX32;
298
299 err = sys_personality(personality);
300 if (personality(err) == PER_LINUX32)
301 err = (err & ~PER_MASK) | PER_LINUX;
302
303 return err;
304 }
305
306 /*
307 * Up to kernel v5.9 we defined O_NONBLOCK as 000200004,
308 * since then O_NONBLOCK is defined as 000200000.
309 *
310 * The following wrapper functions mask out the old
311 * O_NDELAY bit from calls which use O_NONBLOCK.
312 *
313 * XXX: Remove those in year 2022 (or later)?
314 */
315
316 #define O_NONBLOCK_OLD 000200004
317 #define O_NONBLOCK_MASK_OUT (O_NONBLOCK_OLD & ~O_NONBLOCK)
318
319 static int FIX_O_NONBLOCK(int flags)
320 {
321 if ((flags & O_NONBLOCK_MASK_OUT) &&
322 !test_thread_flag(TIF_NONBLOCK_WARNING)) {
323 set_thread_flag(TIF_NONBLOCK_WARNING);
324 pr_warn("%s(%d) uses a deprecated O_NONBLOCK value."
325 " Please recompile with newer glibc.\n",
326 current->comm, current->pid);
327 }
328 return flags & ~O_NONBLOCK_MASK_OUT;
329 }
330
331 asmlinkage long parisc_timerfd_create(int clockid, int flags)
332 {
333 flags = FIX_O_NONBLOCK(flags);
334 return sys_timerfd_create(clockid, flags);
335 }
336
337 asmlinkage long parisc_signalfd4(int ufd, sigset_t __user *user_mask,
338 size_t sizemask, int flags)
339 {
340 flags = FIX_O_NONBLOCK(flags);
341 return sys_signalfd4(ufd, user_mask, sizemask, flags);
342 }
343
344 #ifdef CONFIG_COMPAT
345 asmlinkage long parisc_compat_signalfd4(int ufd,
346 compat_sigset_t __user *user_mask,
347 compat_size_t sizemask, int flags)
348 {
349 flags = FIX_O_NONBLOCK(flags);
350 return compat_sys_signalfd4(ufd, user_mask, sizemask, flags);
351 }
352 #endif
353
354 asmlinkage long parisc_eventfd2(unsigned int count, int flags)
355 {
356 flags = FIX_O_NONBLOCK(flags);
357 return sys_eventfd2(count, flags);
358 }
359
360 asmlinkage long parisc_userfaultfd(int flags)
361 {
362 flags = FIX_O_NONBLOCK(flags);
363 return sys_userfaultfd(flags);
364 }
365
366 asmlinkage long parisc_pipe2(int __user *fildes, int flags)
367 {
368 flags = FIX_O_NONBLOCK(flags);
369 return sys_pipe2(fildes, flags);
370 }
371
372 asmlinkage long parisc_inotify_init1(int flags)
373 {
374 flags = FIX_O_NONBLOCK(flags);
375 return sys_inotify_init1(flags);
376 }
377
378 /*
379 * madvise() wrapper
380 *
381 * Up to kernel v6.1 parisc has different values than all other
382 * platforms for the MADV_xxx flags listed below.
383 * To keep binary compatibility with existing userspace programs
384 * translate the former values to the new values.
385 *
386 * XXX: Remove this wrapper in year 2025 (or later)
387 */
388
389 asmlinkage notrace long parisc_madvise(unsigned long start, size_t len_in, int behavior)
390 {
391 switch (behavior) {
392 case 65: behavior = MADV_MERGEABLE; break;
393 case 66: behavior = MADV_UNMERGEABLE; break;
394 case 67: behavior = MADV_HUGEPAGE; break;
395 case 68: behavior = MADV_NOHUGEPAGE; break;
396 case 69: behavior = MADV_DONTDUMP; break;
397 case 70: behavior = MADV_DODUMP; break;
398 case 71: behavior = MADV_WIPEONFORK; break;
399 case 72: behavior = MADV_KEEPONFORK; break;
400 case 73: behavior = MADV_COLLAPSE; break;
401 }
402
403 return sys_madvise(start, len_in, behavior);
404 }
405
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