projects/linux·blob master · refs

409 lines · 10.9 KiB

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
37static unsigned long shared_align_offset(unsigned long filp_pgoff,
38 unsigned long pgoff)
39{
40 return (filp_pgoff + pgoff) << PAGE_SHIFT;
41}
42
43static 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#ifdef CONFIG_COMPAT
54#define STACK_SIZE_DEFAULT (USER_WIDE_MODE \
55 ? (1 << 30) /* 1 GB */ \
56 : (CONFIG_STACK_MAX_DEFAULT_SIZE_MB*1024*1024))
57#else
58#define STACK_SIZE_DEFAULT (1 << 30)
59#endif
60
61unsigned 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
75/*
76 * Top of mmap area (just below the process stack).
77 */
78
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 */
84unsigned long mmap_upper_limit(const struct rlimit *rlim_stack)
85{
86 unsigned long stack_base;
87
88 /* Limit stack size - see setup_arg_pages() in fs/exec.c */
89 stack_base = rlim_stack ? rlim_stack->rlim_max
90 : rlimit_max(RLIMIT_STACK);
91
92 stack_base = calc_max_stack_size(stack_base);
93
94 /* Add space for stack randomization. */
95 if (current->flags & PF_RANDOMIZE)
96 stack_base += (STACK_RND_MASK << PAGE_SHIFT);
97
98 return PAGE_ALIGN(STACK_TOP - stack_base);
99}
100
101enum mmap_allocation_direction {UP, DOWN};
102
103static unsigned long arch_get_unmapped_area_common(struct file *filp,
104 unsigned long addr, unsigned long len, unsigned long pgoff,
105 unsigned long flags, enum mmap_allocation_direction dir)
106{
107 struct mm_struct *mm = current->mm;
108 struct vm_area_struct *vma, *prev;
109 unsigned long filp_pgoff;
110 int do_color_align;
111 struct vm_unmapped_area_info info = {
112 .length = len
113 };
114
115 if (unlikely(len > TASK_SIZE))
116 return -ENOMEM;
117
118 do_color_align = 0;
119 if (filp || (flags & MAP_SHARED))
120 do_color_align = 1;
121 filp_pgoff = GET_FILP_PGOFF(filp);
122
123 if (flags & MAP_FIXED) {
124 /* Even MAP_FIXED mappings must reside within TASK_SIZE */
125 if (TASK_SIZE - len < addr)
126 return -EINVAL;
127
128 if ((flags & MAP_SHARED) && filp &&
129 (addr - shared_align_offset(filp_pgoff, pgoff))
130 & (SHM_COLOUR - 1))
131 return -EINVAL;
132 return addr;
133 }
134
135 if (addr) {
136 if (do_color_align)
137 addr = COLOR_ALIGN(addr, filp_pgoff, pgoff);
138 else
139 addr = PAGE_ALIGN(addr);
140
141 vma = find_vma_prev(mm, addr, &prev);
142 if (TASK_SIZE - len >= addr &&
143 (!vma || addr + len <= vm_start_gap(vma)) &&
144 (!prev || addr >= vm_end_gap(prev)))
145 return addr;
146 }
147
148 info.align_mask = do_color_align ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
149 info.align_offset = shared_align_offset(filp_pgoff, pgoff);
150
151 if (dir == DOWN) {
152 info.flags = VM_UNMAPPED_AREA_TOPDOWN;
153 info.low_limit = PAGE_SIZE;
154 info.high_limit = mm->mmap_base;
155 addr = vm_unmapped_area(&info);
156 if (!(addr & ~PAGE_MASK))
157 return addr;
158 VM_BUG_ON(addr != -ENOMEM);
159
160 /*
161 * A failed mmap() very likely causes application failure,
162 * so fall back to the bottom-up function here. This scenario
163 * can happen with large stack limits and large mmap()
164 * allocations.
165 */
166 }
167
168 info.low_limit = mm->mmap_base;
169 info.high_limit = mmap_upper_limit(NULL);
170 return vm_unmapped_area(&info);
171}
172
173unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
174 unsigned long len, unsigned long pgoff, unsigned long flags,
175 vm_flags_t vm_flags)
176{
177 return arch_get_unmapped_area_common(filp,
178 addr, len, pgoff, flags, UP);
179}
180
181unsigned long arch_get_unmapped_area_topdown(struct file *filp,
182 unsigned long addr, unsigned long len, unsigned long pgoff,
183 unsigned long flags, vm_flags_t vm_flags)
184{
185 return arch_get_unmapped_area_common(filp,
186 addr, len, pgoff, flags, DOWN);
187}
188
189asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
190 unsigned long prot, unsigned long flags, unsigned long fd,
191 unsigned long pgoff)
192{
193 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
194 we have. */
195 return ksys_mmap_pgoff(addr, len, prot, flags, fd,
196 pgoff >> (PAGE_SHIFT - 12));
197}
198
199asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
200 unsigned long prot, unsigned long flags, unsigned long fd,
201 unsigned long offset)
202{
203 if (!(offset & ~PAGE_MASK)) {
204 return ksys_mmap_pgoff(addr, len, prot, flags, fd,
205 offset >> PAGE_SHIFT);
206 } else {
207 return -EINVAL;
208 }
209}
210
211/* Fucking broken ABI */
212
213#ifdef CONFIG_64BIT
214asmlinkage long parisc_truncate64(const char __user * path,
215 unsigned int high, unsigned int low)
216{
217 return ksys_truncate(path, (long)high << 32 | low);
218}
219
220asmlinkage long parisc_ftruncate64(unsigned int fd,
221 unsigned int high, unsigned int low)
222{
223 return ksys_ftruncate(fd, (long)high << 32 | low, FTRUNCATE_LFS);
224}
225
226/* stubs for the benefit of the syscall_table since truncate64 and truncate
227 * are identical on LP64 */
228asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
229{
230 return ksys_truncate(path, length);
231}
232asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
233{
234 return ksys_ftruncate(fd, length, FTRUNCATE_LFS);
235}
236asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
237{
238 return sys_fcntl(fd, cmd, arg);
239}
240#else
241
242asmlinkage long parisc_truncate64(const char __user * path,
243 unsigned int high, unsigned int low)
244{
245 return ksys_truncate(path, (loff_t)high << 32 | low);
246}
247
248asmlinkage long parisc_ftruncate64(unsigned int fd,
249 unsigned int high, unsigned int low)
250{
251 return sys_ftruncate64(fd, (loff_t)high << 32 | low);
252}
253#endif
254
255asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count,
256 unsigned int high, unsigned int low)
257{
258 return ksys_pread64(fd, buf, count, (loff_t)high << 32 | low);
259}
260
261asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf,
262 size_t count, unsigned int high, unsigned int low)
263{
264 return ksys_pwrite64(fd, buf, count, (loff_t)high << 32 | low);
265}
266
267asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low,
268 size_t count)
269{
270 return ksys_readahead(fd, (loff_t)high << 32 | low, count);
271}
272
273asmlinkage long parisc_fadvise64_64(int fd,
274 unsigned int high_off, unsigned int low_off,
275 unsigned int high_len, unsigned int low_len, int advice)
276{
277 return ksys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off,
278 (loff_t)high_len << 32 | low_len, advice);
279}
280
281asmlinkage long parisc_sync_file_range(int fd,
282 u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes,
283 unsigned int flags)
284{
285 return ksys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off,
286 (loff_t)hi_nbytes << 32 | lo_nbytes, flags);
287}
288
289asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo,
290 u32 lenhi, u32 lenlo)
291{
292 return ksys_fallocate(fd, mode, ((u64)offhi << 32) | offlo,
293 ((u64)lenhi << 32) | lenlo);
294}
295
296asmlinkage long parisc_personality(unsigned long personality)
297{
298 long err;
299
300 if (personality(current->personality) == PER_LINUX32
301 && personality(personality) == PER_LINUX)
302 personality = (personality & ~PER_MASK) | PER_LINUX32;
303
304 err = sys_personality(personality);
305 if (personality(err) == PER_LINUX32)
306 err = (err & ~PER_MASK) | PER_LINUX;
307
308 return err;
309}
310
311/*
312 * Up to kernel v5.9 we defined O_NONBLOCK as 000200004,
313 * since then O_NONBLOCK is defined as 000200000.
314 *
315 * The following wrapper functions mask out the old
316 * O_NDELAY bit from calls which use O_NONBLOCK.
317 *
318 * XXX: Remove those in year 2022 (or later)?
319 */
320
321#define O_NONBLOCK_OLD 000200004
322#define O_NONBLOCK_MASK_OUT (O_NONBLOCK_OLD & ~O_NONBLOCK)
323
324static int FIX_O_NONBLOCK(int flags)
325{
326 if ((flags & O_NONBLOCK_MASK_OUT) &&
327 !test_thread_flag(TIF_NONBLOCK_WARNING)) {
328 set_thread_flag(TIF_NONBLOCK_WARNING);
329 pr_warn("%s(%d) uses a deprecated O_NONBLOCK value."
330 " Please recompile with newer glibc.\n",
331 current->comm, current->pid);
332 }
333 return flags & ~O_NONBLOCK_MASK_OUT;
334}
335
336asmlinkage long parisc_timerfd_create(int clockid, int flags)
337{
338 flags = FIX_O_NONBLOCK(flags);
339 return sys_timerfd_create(clockid, flags);
340}
341
342asmlinkage long parisc_signalfd4(int ufd, sigset_t __user *user_mask,
343 size_t sizemask, int flags)
344{
345 flags = FIX_O_NONBLOCK(flags);
346 return sys_signalfd4(ufd, user_mask, sizemask, flags);
347}
348
349#ifdef CONFIG_COMPAT
350asmlinkage long parisc_compat_signalfd4(int ufd,
351 compat_sigset_t __user *user_mask,
352 compat_size_t sizemask, int flags)
353{
354 flags = FIX_O_NONBLOCK(flags);
355 return compat_sys_signalfd4(ufd, user_mask, sizemask, flags);
356}
357#endif
358
359asmlinkage long parisc_eventfd2(unsigned int count, int flags)
360{
361 flags = FIX_O_NONBLOCK(flags);
362 return sys_eventfd2(count, flags);
363}
364
365asmlinkage long parisc_userfaultfd(int flags)
366{
367 flags = FIX_O_NONBLOCK(flags);
368 return sys_userfaultfd(flags);
369}
370
371asmlinkage long parisc_pipe2(int __user *fildes, int flags)
372{
373 flags = FIX_O_NONBLOCK(flags);
374 return sys_pipe2(fildes, flags);
375}
376
377asmlinkage long parisc_inotify_init1(int flags)
378{
379 flags = FIX_O_NONBLOCK(flags);
380 return sys_inotify_init1(flags);
381}
382
383/*
384 * madvise() wrapper
385 *
386 * Up to kernel v6.1 parisc has different values than all other
387 * platforms for the MADV_xxx flags listed below.
388 * To keep binary compatibility with existing userspace programs
389 * translate the former values to the new values.
390 *
391 * XXX: Remove this wrapper in year 2025 (or later)
392 */
393
394asmlinkage notrace long parisc_madvise(unsigned long start, size_t len_in, int behavior)
395{
396 switch (behavior) {
397 case 65: behavior = MADV_MERGEABLE; break;
398 case 66: behavior = MADV_UNMERGEABLE; break;
399 case 67: behavior = MADV_HUGEPAGE; break;
400 case 68: behavior = MADV_NOHUGEPAGE; break;
401 case 69: behavior = MADV_DONTDUMP; break;
402 case 70: behavior = MADV_DODUMP; break;
403 case 71: behavior = MADV_WIPEONFORK; break;
404 case 72: behavior = MADV_KEEPONFORK; break;
405 case 73: behavior = MADV_COLLAPSE; break;
406 }
407
408 return sys_madvise(start, len_in, behavior);
409}