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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
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> | |
44a4c9e4 | 9 | * Copyright (C) 1999-2020 Helge Deller <deller@gmx.de> |
1da177e4 LT |
10 | */ |
11 | ||
7c0f6ba6 | 12 | #include <linux/uaccess.h> |
9dabf60d | 13 | #include <asm/elf.h> |
1da177e4 LT |
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> | |
3f07c014 | 19 | #include <linux/sched/signal.h> |
01042607 | 20 | #include <linux/sched/mm.h> |
1da177e4 | 21 | #include <linux/shm.h> |
1da177e4 | 22 | #include <linux/syscalls.h> |
75a49581 KM |
23 | #include <linux/utsname.h> |
24 | #include <linux/personality.h> | |
9dabf60d | 25 | #include <linux/random.h> |
44a4c9e4 | 26 | #include <linux/compat.h> |
1da177e4 | 27 | |
9dabf60d HD |
28 | /* we construct an artificial offset for the mapping based on the physical |
29 | * address of the kernel mapping variable */ | |
30 | #define GET_LAST_MMAP(filp) \ | |
31 | (filp ? ((unsigned long) filp->f_mapping) >> 8 : 0UL) | |
32 | #define SET_LAST_MMAP(filp, val) \ | |
33 | { /* nothing */ } | |
34 | ||
35 | static int get_offset(unsigned int last_mmap) | |
1da177e4 | 36 | { |
0ef36bd2 | 37 | return (last_mmap & (SHM_COLOUR-1)) >> PAGE_SHIFT; |
9dabf60d | 38 | } |
1da177e4 | 39 | |
9dabf60d HD |
40 | static unsigned long shared_align_offset(unsigned int last_mmap, |
41 | unsigned long pgoff) | |
42 | { | |
43 | return (get_offset(last_mmap) + pgoff) << PAGE_SHIFT; | |
1da177e4 LT |
44 | } |
45 | ||
9dabf60d HD |
46 | static inline unsigned long COLOR_ALIGN(unsigned long addr, |
47 | unsigned int last_mmap, unsigned long pgoff) | |
1da177e4 | 48 | { |
0ef36bd2 HD |
49 | unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1); |
50 | unsigned long off = (SHM_COLOUR-1) & | |
9dabf60d HD |
51 | (shared_align_offset(last_mmap, pgoff) << PAGE_SHIFT); |
52 | ||
53 | return base + off; | |
1da177e4 LT |
54 | } |
55 | ||
22ee3ea5 HD |
56 | |
57 | #define STACK_SIZE_DEFAULT (USER_WIDE_MODE \ | |
58 | ? (1 << 30) /* 1 GB */ \ | |
59 | : (CONFIG_STACK_MAX_DEFAULT_SIZE_MB*1024*1024)) | |
60 | ||
61 | unsigned long calc_max_stack_size(unsigned long stack_max) | |
62 | { | |
63 | #ifdef CONFIG_COMPAT | |
64 | if (!USER_WIDE_MODE && (stack_max == COMPAT_RLIM_INFINITY)) | |
65 | stack_max = STACK_SIZE_DEFAULT; | |
66 | else | |
67 | #endif | |
68 | if (stack_max == RLIM_INFINITY) | |
69 | stack_max = STACK_SIZE_DEFAULT; | |
70 | ||
71 | return stack_max; | |
72 | } | |
73 | ||
74 | ||
9dabf60d HD |
75 | /* |
76 | * Top of mmap area (just below the process stack). | |
77 | */ | |
78 | ||
8f2af155 KC |
79 | /* |
80 | * When called from arch_get_unmapped_area(), rlim_stack will be NULL, | |
81 | * indicating that "current" should be used instead of a passed-in | |
82 | * value from the exec bprm as done with arch_pick_mmap_layout(). | |
83 | */ | |
84 | static unsigned long mmap_upper_limit(struct rlimit *rlim_stack) | |
0576da2c | 85 | { |
9dabf60d | 86 | unsigned long stack_base; |
0576da2c | 87 | |
042d27ac | 88 | /* Limit stack size - see setup_arg_pages() in fs/exec.c */ |
8f2af155 KC |
89 | stack_base = rlim_stack ? rlim_stack->rlim_max |
90 | : rlimit_max(RLIMIT_STACK); | |
22ee3ea5 HD |
91 | |
92 | stack_base = calc_max_stack_size(stack_base); | |
9dabf60d | 93 | |
d045c77c | 94 | /* Add space for stack randomization. */ |
17d9822d AG |
95 | if (current->flags & PF_RANDOMIZE) |
96 | stack_base += (STACK_RND_MASK << PAGE_SHIFT); | |
d045c77c | 97 | |
9dabf60d | 98 | return PAGE_ALIGN(STACK_TOP - stack_base); |
0576da2c HD |
99 | } |
100 | ||
9dabf60d HD |
101 | |
102 | unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, | |
103 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
1da177e4 | 104 | { |
9dabf60d | 105 | struct mm_struct *mm = current->mm; |
1be7107f | 106 | struct vm_area_struct *vma, *prev; |
9dabf60d HD |
107 | unsigned long task_size = TASK_SIZE; |
108 | int do_color_align, last_mmap; | |
a0031197 | 109 | struct vm_unmapped_area_info info; |
1da177e4 | 110 | |
9dabf60d HD |
111 | if (len > task_size) |
112 | return -ENOMEM; | |
113 | ||
114 | do_color_align = 0; | |
115 | if (filp || (flags & MAP_SHARED)) | |
116 | do_color_align = 1; | |
117 | last_mmap = GET_LAST_MMAP(filp); | |
118 | ||
119 | if (flags & MAP_FIXED) { | |
120 | if ((flags & MAP_SHARED) && last_mmap && | |
121 | (addr - shared_align_offset(last_mmap, pgoff)) | |
0ef36bd2 | 122 | & (SHM_COLOUR - 1)) |
9dabf60d HD |
123 | return -EINVAL; |
124 | goto found_addr; | |
125 | } | |
126 | ||
127 | if (addr) { | |
128 | if (do_color_align && last_mmap) | |
129 | addr = COLOR_ALIGN(addr, last_mmap, pgoff); | |
130 | else | |
131 | addr = PAGE_ALIGN(addr); | |
132 | ||
1be7107f | 133 | vma = find_vma_prev(mm, addr, &prev); |
9dabf60d | 134 | if (task_size - len >= addr && |
1be7107f HD |
135 | (!vma || addr + len <= vm_start_gap(vma)) && |
136 | (!prev || addr >= vm_end_gap(prev))) | |
9dabf60d HD |
137 | goto found_addr; |
138 | } | |
139 | ||
a0031197 ML |
140 | info.flags = 0; |
141 | info.length = len; | |
9dabf60d | 142 | info.low_limit = mm->mmap_legacy_base; |
8f2af155 | 143 | info.high_limit = mmap_upper_limit(NULL); |
0ef36bd2 | 144 | info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; |
9dabf60d HD |
145 | info.align_offset = shared_align_offset(last_mmap, pgoff); |
146 | addr = vm_unmapped_area(&info); | |
147 | ||
148 | found_addr: | |
149 | if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) | |
150 | SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); | |
151 | ||
152 | return addr; | |
1da177e4 LT |
153 | } |
154 | ||
9dabf60d HD |
155 | unsigned long |
156 | arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, | |
157 | const unsigned long len, const unsigned long pgoff, | |
158 | const unsigned long flags) | |
1da177e4 | 159 | { |
1be7107f | 160 | struct vm_area_struct *vma, *prev; |
9dabf60d HD |
161 | struct mm_struct *mm = current->mm; |
162 | unsigned long addr = addr0; | |
163 | int do_color_align, last_mmap; | |
164 | struct vm_unmapped_area_info info; | |
165 | ||
9dabf60d | 166 | /* requested length too big for entire address space */ |
1da177e4 LT |
167 | if (len > TASK_SIZE) |
168 | return -ENOMEM; | |
9dabf60d HD |
169 | |
170 | do_color_align = 0; | |
171 | if (filp || (flags & MAP_SHARED)) | |
172 | do_color_align = 1; | |
173 | last_mmap = GET_LAST_MMAP(filp); | |
174 | ||
5ca8b91d | 175 | if (flags & MAP_FIXED) { |
9dabf60d HD |
176 | if ((flags & MAP_SHARED) && last_mmap && |
177 | (addr - shared_align_offset(last_mmap, pgoff)) | |
0ef36bd2 | 178 | & (SHM_COLOUR - 1)) |
5ca8b91d | 179 | return -EINVAL; |
9dabf60d | 180 | goto found_addr; |
5ca8b91d | 181 | } |
1da177e4 | 182 | |
9dabf60d HD |
183 | /* requesting a specific address */ |
184 | if (addr) { | |
185 | if (do_color_align && last_mmap) | |
186 | addr = COLOR_ALIGN(addr, last_mmap, pgoff); | |
187 | else | |
188 | addr = PAGE_ALIGN(addr); | |
1be7107f HD |
189 | |
190 | vma = find_vma_prev(mm, addr, &prev); | |
9dabf60d | 191 | if (TASK_SIZE - len >= addr && |
1be7107f HD |
192 | (!vma || addr + len <= vm_start_gap(vma)) && |
193 | (!prev || addr >= vm_end_gap(prev))) | |
9dabf60d HD |
194 | goto found_addr; |
195 | } | |
196 | ||
197 | info.flags = VM_UNMAPPED_AREA_TOPDOWN; | |
198 | info.length = len; | |
199 | info.low_limit = PAGE_SIZE; | |
200 | info.high_limit = mm->mmap_base; | |
0ef36bd2 | 201 | info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; |
9dabf60d HD |
202 | info.align_offset = shared_align_offset(last_mmap, pgoff); |
203 | addr = vm_unmapped_area(&info); | |
204 | if (!(addr & ~PAGE_MASK)) | |
205 | goto found_addr; | |
206 | VM_BUG_ON(addr != -ENOMEM); | |
207 | ||
208 | /* | |
209 | * A failed mmap() very likely causes application failure, | |
210 | * so fall back to the bottom-up function here. This scenario | |
211 | * can happen with large stack limits and large mmap() | |
212 | * allocations. | |
213 | */ | |
214 | return arch_get_unmapped_area(filp, addr0, len, pgoff, flags); | |
215 | ||
216 | found_addr: | |
217 | if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) | |
218 | SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); | |
0576da2c | 219 | |
1da177e4 LT |
220 | return addr; |
221 | } | |
222 | ||
9dabf60d HD |
223 | static int mmap_is_legacy(void) |
224 | { | |
225 | if (current->personality & ADDR_COMPAT_LAYOUT) | |
226 | return 1; | |
227 | ||
228 | /* parisc stack always grows up - so a unlimited stack should | |
229 | * not be an indicator to use the legacy memory layout. | |
230 | * if (rlimit(RLIMIT_STACK) == RLIM_INFINITY) | |
231 | * return 1; | |
232 | */ | |
233 | ||
234 | return sysctl_legacy_va_layout; | |
235 | } | |
236 | ||
237 | static unsigned long mmap_rnd(void) | |
238 | { | |
239 | unsigned long rnd = 0; | |
240 | ||
18d98a79 HD |
241 | if (current->flags & PF_RANDOMIZE) |
242 | rnd = get_random_int() & MMAP_RND_MASK; | |
243 | ||
9dabf60d HD |
244 | return rnd << PAGE_SHIFT; |
245 | } | |
246 | ||
18d98a79 HD |
247 | unsigned long arch_mmap_rnd(void) |
248 | { | |
249 | return (get_random_int() & MMAP_RND_MASK) << PAGE_SHIFT; | |
250 | } | |
251 | ||
9dabf60d HD |
252 | static unsigned long mmap_legacy_base(void) |
253 | { | |
254 | return TASK_UNMAPPED_BASE + mmap_rnd(); | |
255 | } | |
256 | ||
257 | /* | |
258 | * This function, called very early during the creation of a new | |
259 | * process VM image, sets up which VM layout function to use: | |
260 | */ | |
8f2af155 | 261 | void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) |
9dabf60d HD |
262 | { |
263 | mm->mmap_legacy_base = mmap_legacy_base(); | |
8f2af155 | 264 | mm->mmap_base = mmap_upper_limit(rlim_stack); |
9dabf60d HD |
265 | |
266 | if (mmap_is_legacy()) { | |
267 | mm->mmap_base = mm->mmap_legacy_base; | |
268 | mm->get_unmapped_area = arch_get_unmapped_area; | |
269 | } else { | |
270 | mm->get_unmapped_area = arch_get_unmapped_area_topdown; | |
271 | } | |
272 | } | |
273 | ||
274 | ||
1da177e4 LT |
275 | asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, |
276 | unsigned long prot, unsigned long flags, unsigned long fd, | |
277 | unsigned long pgoff) | |
278 | { | |
279 | /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE | |
280 | we have. */ | |
a90f590a DB |
281 | return ksys_mmap_pgoff(addr, len, prot, flags, fd, |
282 | pgoff >> (PAGE_SHIFT - 12)); | |
1da177e4 LT |
283 | } |
284 | ||
285 | asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, | |
286 | unsigned long prot, unsigned long flags, unsigned long fd, | |
287 | unsigned long offset) | |
288 | { | |
289 | if (!(offset & ~PAGE_MASK)) { | |
a90f590a | 290 | return ksys_mmap_pgoff(addr, len, prot, flags, fd, |
f8b72560 | 291 | offset >> PAGE_SHIFT); |
1da177e4 LT |
292 | } else { |
293 | return -EINVAL; | |
294 | } | |
295 | } | |
296 | ||
1da177e4 LT |
297 | /* Fucking broken ABI */ |
298 | ||
299 | #ifdef CONFIG_64BIT | |
300 | asmlinkage long parisc_truncate64(const char __user * path, | |
301 | unsigned int high, unsigned int low) | |
302 | { | |
df260e21 | 303 | return ksys_truncate(path, (long)high << 32 | low); |
1da177e4 LT |
304 | } |
305 | ||
306 | asmlinkage long parisc_ftruncate64(unsigned int fd, | |
307 | unsigned int high, unsigned int low) | |
308 | { | |
411d9475 | 309 | return ksys_ftruncate(fd, (long)high << 32 | low); |
1da177e4 LT |
310 | } |
311 | ||
312 | /* stubs for the benefit of the syscall_table since truncate64 and truncate | |
313 | * are identical on LP64 */ | |
314 | asmlinkage long sys_truncate64(const char __user * path, unsigned long length) | |
315 | { | |
df260e21 | 316 | return ksys_truncate(path, length); |
1da177e4 LT |
317 | } |
318 | asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length) | |
319 | { | |
411d9475 | 320 | return ksys_ftruncate(fd, length); |
1da177e4 LT |
321 | } |
322 | asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) | |
323 | { | |
324 | return sys_fcntl(fd, cmd, arg); | |
325 | } | |
326 | #else | |
327 | ||
328 | asmlinkage long parisc_truncate64(const char __user * path, | |
329 | unsigned int high, unsigned int low) | |
330 | { | |
df260e21 | 331 | return ksys_truncate(path, (loff_t)high << 32 | low); |
1da177e4 LT |
332 | } |
333 | ||
334 | asmlinkage long parisc_ftruncate64(unsigned int fd, | |
335 | unsigned int high, unsigned int low) | |
336 | { | |
337 | return sys_ftruncate64(fd, (loff_t)high << 32 | low); | |
338 | } | |
339 | #endif | |
340 | ||
341 | asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count, | |
342 | unsigned int high, unsigned int low) | |
343 | { | |
36028d5d | 344 | return ksys_pread64(fd, buf, count, (loff_t)high << 32 | low); |
1da177e4 LT |
345 | } |
346 | ||
347 | asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf, | |
348 | size_t count, unsigned int high, unsigned int low) | |
349 | { | |
36028d5d | 350 | return ksys_pwrite64(fd, buf, count, (loff_t)high << 32 | low); |
1da177e4 LT |
351 | } |
352 | ||
353 | asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low, | |
354 | size_t count) | |
355 | { | |
c7b95d51 | 356 | return ksys_readahead(fd, (loff_t)high << 32 | low, count); |
1da177e4 LT |
357 | } |
358 | ||
359 | asmlinkage long parisc_fadvise64_64(int fd, | |
360 | unsigned int high_off, unsigned int low_off, | |
361 | unsigned int high_len, unsigned int low_len, int advice) | |
362 | { | |
9d5b7c95 | 363 | return ksys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off, |
1da177e4 LT |
364 | (loff_t)high_len << 32 | low_len, advice); |
365 | } | |
366 | ||
6ca773cf KM |
367 | asmlinkage long parisc_sync_file_range(int fd, |
368 | u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes, | |
369 | unsigned int flags) | |
370 | { | |
806cbae1 | 371 | return ksys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off, |
6ca773cf KM |
372 | (loff_t)hi_nbytes << 32 | lo_nbytes, flags); |
373 | } | |
374 | ||
4474a331 HD |
375 | asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo, |
376 | u32 lenhi, u32 lenlo) | |
377 | { | |
edf292c7 DB |
378 | return ksys_fallocate(fd, mode, ((u64)offhi << 32) | offlo, |
379 | ((u64)lenhi << 32) | lenlo); | |
4474a331 HD |
380 | } |
381 | ||
75a49581 KM |
382 | long parisc_personality(unsigned long personality) |
383 | { | |
384 | long err; | |
385 | ||
386 | if (personality(current->personality) == PER_LINUX32 | |
5b24c421 JK |
387 | && personality(personality) == PER_LINUX) |
388 | personality = (personality & ~PER_MASK) | PER_LINUX32; | |
75a49581 KM |
389 | |
390 | err = sys_personality(personality); | |
5b24c421 JK |
391 | if (personality(err) == PER_LINUX32) |
392 | err = (err & ~PER_MASK) | PER_LINUX; | |
75a49581 KM |
393 | |
394 | return err; | |
395 | } | |
44a4c9e4 HD |
396 | |
397 | /* | |
398 | * Up to kernel v5.9 we defined O_NONBLOCK as 000200004, | |
399 | * since then O_NONBLOCK is defined as 000200000. | |
400 | * | |
401 | * The following wrapper functions mask out the old | |
402 | * O_NDELAY bit from calls which use O_NONBLOCK. | |
403 | * | |
404 | * XXX: Remove those in year 2022 (or later)? | |
405 | */ | |
406 | ||
407 | #define O_NONBLOCK_OLD 000200004 | |
408 | #define O_NONBLOCK_MASK_OUT (O_NONBLOCK_OLD & ~O_NONBLOCK) | |
409 | ||
410 | static int FIX_O_NONBLOCK(int flags) | |
411 | { | |
412 | if (flags & O_NONBLOCK_MASK_OUT) { | |
413 | struct task_struct *tsk = current; | |
414 | pr_warn_once("%s(%d) uses a deprecated O_NONBLOCK value.\n", | |
415 | tsk->comm, tsk->pid); | |
416 | } | |
417 | return flags & ~O_NONBLOCK_MASK_OUT; | |
418 | } | |
419 | ||
420 | asmlinkage long parisc_timerfd_create(int clockid, int flags) | |
421 | { | |
422 | flags = FIX_O_NONBLOCK(flags); | |
423 | return sys_timerfd_create(clockid, flags); | |
424 | } | |
425 | ||
426 | asmlinkage long parisc_signalfd4(int ufd, sigset_t __user *user_mask, | |
427 | size_t sizemask, int flags) | |
428 | { | |
429 | flags = FIX_O_NONBLOCK(flags); | |
430 | return sys_signalfd4(ufd, user_mask, sizemask, flags); | |
431 | } | |
432 | ||
433 | #ifdef CONFIG_COMPAT | |
434 | asmlinkage long parisc_compat_signalfd4(int ufd, | |
435 | compat_sigset_t __user *user_mask, | |
436 | compat_size_t sizemask, int flags) | |
437 | { | |
438 | flags = FIX_O_NONBLOCK(flags); | |
439 | return compat_sys_signalfd4(ufd, user_mask, sizemask, flags); | |
440 | } | |
441 | #endif | |
442 | ||
443 | asmlinkage long parisc_eventfd2(unsigned int count, int flags) | |
444 | { | |
445 | flags = FIX_O_NONBLOCK(flags); | |
446 | return sys_eventfd2(count, flags); | |
447 | } | |
448 | ||
449 | asmlinkage long parisc_userfaultfd(int flags) | |
450 | { | |
451 | flags = FIX_O_NONBLOCK(flags); | |
452 | return sys_userfaultfd(flags); | |
453 | } | |
454 | ||
455 | asmlinkage long parisc_pipe2(int __user *fildes, int flags) | |
456 | { | |
457 | flags = FIX_O_NONBLOCK(flags); | |
458 | return sys_pipe2(fildes, flags); | |
459 | } | |
460 | ||
461 | asmlinkage long parisc_inotify_init1(int flags) | |
462 | { | |
463 | flags = FIX_O_NONBLOCK(flags); | |
464 | return sys_inotify_init1(flags); | |
465 | } |