]> Git Repo - linux.git/blob - arch/parisc/kernel/sys_parisc.c
Linux 6.14-rc3
[linux.git] / arch / parisc / kernel / sys_parisc.c
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 <[email protected]>
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         vm_flags_t vm_flags)
172 {
173         return arch_get_unmapped_area_common(filp,
174                         addr, len, pgoff, flags, UP);
175 }
176
177 unsigned long arch_get_unmapped_area_topdown(struct file *filp,
178         unsigned long addr, unsigned long len, unsigned long pgoff,
179         unsigned long flags, vm_flags_t vm_flags)
180 {
181         return arch_get_unmapped_area_common(filp,
182                         addr, len, pgoff, flags, DOWN);
183 }
184
185 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
186         unsigned long prot, unsigned long flags, unsigned long fd,
187         unsigned long pgoff)
188 {
189         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
190            we have. */
191         return ksys_mmap_pgoff(addr, len, prot, flags, fd,
192                                pgoff >> (PAGE_SHIFT - 12));
193 }
194
195 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
196                 unsigned long prot, unsigned long flags, unsigned long fd,
197                 unsigned long offset)
198 {
199         if (!(offset & ~PAGE_MASK)) {
200                 return ksys_mmap_pgoff(addr, len, prot, flags, fd,
201                                         offset >> PAGE_SHIFT);
202         } else {
203                 return -EINVAL;
204         }
205 }
206
207 /* Fucking broken ABI */
208
209 #ifdef CONFIG_64BIT
210 asmlinkage long parisc_truncate64(const char __user * path,
211                                         unsigned int high, unsigned int low)
212 {
213         return ksys_truncate(path, (long)high << 32 | low);
214 }
215
216 asmlinkage long parisc_ftruncate64(unsigned int fd,
217                                         unsigned int high, unsigned int low)
218 {
219         return ksys_ftruncate(fd, (long)high << 32 | low);
220 }
221
222 /* stubs for the benefit of the syscall_table since truncate64 and truncate 
223  * are identical on LP64 */
224 asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
225 {
226         return ksys_truncate(path, length);
227 }
228 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
229 {
230         return ksys_ftruncate(fd, length);
231 }
232 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
233 {
234         return sys_fcntl(fd, cmd, arg);
235 }
236 #else
237
238 asmlinkage long parisc_truncate64(const char __user * path,
239                                         unsigned int high, unsigned int low)
240 {
241         return ksys_truncate(path, (loff_t)high << 32 | low);
242 }
243
244 asmlinkage long parisc_ftruncate64(unsigned int fd,
245                                         unsigned int high, unsigned int low)
246 {
247         return sys_ftruncate64(fd, (loff_t)high << 32 | low);
248 }
249 #endif
250
251 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count,
252                                         unsigned int high, unsigned int low)
253 {
254         return ksys_pread64(fd, buf, count, (loff_t)high << 32 | low);
255 }
256
257 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf,
258                         size_t count, unsigned int high, unsigned int low)
259 {
260         return ksys_pwrite64(fd, buf, count, (loff_t)high << 32 | low);
261 }
262
263 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low,
264                                     size_t count)
265 {
266         return ksys_readahead(fd, (loff_t)high << 32 | low, count);
267 }
268
269 asmlinkage long parisc_fadvise64_64(int fd,
270                         unsigned int high_off, unsigned int low_off,
271                         unsigned int high_len, unsigned int low_len, int advice)
272 {
273         return ksys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off,
274                         (loff_t)high_len << 32 | low_len, advice);
275 }
276
277 asmlinkage long parisc_sync_file_range(int fd,
278                         u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes,
279                         unsigned int flags)
280 {
281         return ksys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off,
282                         (loff_t)hi_nbytes << 32 | lo_nbytes, flags);
283 }
284
285 asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo,
286                                 u32 lenhi, u32 lenlo)
287 {
288         return ksys_fallocate(fd, mode, ((u64)offhi << 32) | offlo,
289                               ((u64)lenhi << 32) | lenlo);
290 }
291
292 asmlinkage long parisc_personality(unsigned long personality)
293 {
294         long err;
295
296         if (personality(current->personality) == PER_LINUX32
297             && personality(personality) == PER_LINUX)
298                 personality = (personality & ~PER_MASK) | PER_LINUX32;
299
300         err = sys_personality(personality);
301         if (personality(err) == PER_LINUX32)
302                 err = (err & ~PER_MASK) | PER_LINUX;
303
304         return err;
305 }
306
307 /*
308  * Up to kernel v5.9 we defined O_NONBLOCK as 000200004,
309  * since then O_NONBLOCK is defined as 000200000.
310  *
311  * The following wrapper functions mask out the old
312  * O_NDELAY bit from calls which use O_NONBLOCK.
313  *
314  * XXX: Remove those in year 2022 (or later)?
315  */
316
317 #define O_NONBLOCK_OLD          000200004
318 #define O_NONBLOCK_MASK_OUT     (O_NONBLOCK_OLD & ~O_NONBLOCK)
319
320 static int FIX_O_NONBLOCK(int flags)
321 {
322         if ((flags & O_NONBLOCK_MASK_OUT) &&
323                         !test_thread_flag(TIF_NONBLOCK_WARNING)) {
324                 set_thread_flag(TIF_NONBLOCK_WARNING);
325                 pr_warn("%s(%d) uses a deprecated O_NONBLOCK value."
326                         " Please recompile with newer glibc.\n",
327                         current->comm, current->pid);
328         }
329         return flags & ~O_NONBLOCK_MASK_OUT;
330 }
331
332 asmlinkage long parisc_timerfd_create(int clockid, int flags)
333 {
334         flags = FIX_O_NONBLOCK(flags);
335         return sys_timerfd_create(clockid, flags);
336 }
337
338 asmlinkage long parisc_signalfd4(int ufd, sigset_t __user *user_mask,
339         size_t sizemask, int flags)
340 {
341         flags = FIX_O_NONBLOCK(flags);
342         return sys_signalfd4(ufd, user_mask, sizemask, flags);
343 }
344
345 #ifdef CONFIG_COMPAT
346 asmlinkage long parisc_compat_signalfd4(int ufd,
347         compat_sigset_t __user *user_mask,
348         compat_size_t sizemask, int flags)
349 {
350         flags = FIX_O_NONBLOCK(flags);
351         return compat_sys_signalfd4(ufd, user_mask, sizemask, flags);
352 }
353 #endif
354
355 asmlinkage long parisc_eventfd2(unsigned int count, int flags)
356 {
357         flags = FIX_O_NONBLOCK(flags);
358         return sys_eventfd2(count, flags);
359 }
360
361 asmlinkage long parisc_userfaultfd(int flags)
362 {
363         flags = FIX_O_NONBLOCK(flags);
364         return sys_userfaultfd(flags);
365 }
366
367 asmlinkage long parisc_pipe2(int __user *fildes, int flags)
368 {
369         flags = FIX_O_NONBLOCK(flags);
370         return sys_pipe2(fildes, flags);
371 }
372
373 asmlinkage long parisc_inotify_init1(int flags)
374 {
375         flags = FIX_O_NONBLOCK(flags);
376         return sys_inotify_init1(flags);
377 }
378
379 /*
380  * madvise() wrapper
381  *
382  * Up to kernel v6.1 parisc has different values than all other
383  * platforms for the MADV_xxx flags listed below.
384  * To keep binary compatibility with existing userspace programs
385  * translate the former values to the new values.
386  *
387  * XXX: Remove this wrapper in year 2025 (or later)
388  */
389
390 asmlinkage notrace long parisc_madvise(unsigned long start, size_t len_in, int behavior)
391 {
392         switch (behavior) {
393         case 65: behavior = MADV_MERGEABLE;     break;
394         case 66: behavior = MADV_UNMERGEABLE;   break;
395         case 67: behavior = MADV_HUGEPAGE;      break;
396         case 68: behavior = MADV_NOHUGEPAGE;    break;
397         case 69: behavior = MADV_DONTDUMP;      break;
398         case 70: behavior = MADV_DODUMP;        break;
399         case 71: behavior = MADV_WIPEONFORK;    break;
400         case 72: behavior = MADV_KEEPONFORK;    break;
401         case 73: behavior = MADV_COLLAPSE;      break;
402         }
403
404         return sys_madvise(start, len_in, behavior);
405 }
This page took 0.050658 seconds and 4 git commands to generate.