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3dd681d9 WD |
1 | /* |
2 | * Based on arch/arm/kernel/signal.c | |
3 | * | |
4 | * Copyright (C) 1995-2009 Russell King | |
5 | * Copyright (C) 2012 ARM Ltd. | |
6 | * Modified by Will Deacon <will.deacon@arm.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #define __SYSCALL_COMPAT | |
22 | ||
23 | #include <linux/compat.h> | |
24 | #include <linux/signal.h> | |
25 | #include <linux/syscalls.h> | |
26 | #include <linux/ratelimit.h> | |
27 | ||
28 | #include <asm/fpsimd.h> | |
29 | #include <asm/signal32.h> | |
30 | #include <asm/uaccess.h> | |
31 | #include <asm/unistd.h> | |
32 | ||
33 | typedef struct compat_siginfo { | |
34 | int si_signo; | |
35 | int si_errno; | |
36 | int si_code; | |
37 | ||
38 | union { | |
39 | /* The padding is the same size as AArch64. */ | |
40 | int _pad[SI_PAD_SIZE]; | |
41 | ||
42 | /* kill() */ | |
43 | struct { | |
44 | compat_pid_t _pid; /* sender's pid */ | |
45 | __compat_uid32_t _uid; /* sender's uid */ | |
46 | } _kill; | |
47 | ||
48 | /* POSIX.1b timers */ | |
49 | struct { | |
50 | compat_timer_t _tid; /* timer id */ | |
51 | int _overrun; /* overrun count */ | |
52 | compat_sigval_t _sigval; /* same as below */ | |
53 | int _sys_private; /* not to be passed to user */ | |
54 | } _timer; | |
55 | ||
56 | /* POSIX.1b signals */ | |
57 | struct { | |
58 | compat_pid_t _pid; /* sender's pid */ | |
59 | __compat_uid32_t _uid; /* sender's uid */ | |
60 | compat_sigval_t _sigval; | |
61 | } _rt; | |
62 | ||
63 | /* SIGCHLD */ | |
64 | struct { | |
65 | compat_pid_t _pid; /* which child */ | |
66 | __compat_uid32_t _uid; /* sender's uid */ | |
67 | int _status; /* exit code */ | |
68 | compat_clock_t _utime; | |
69 | compat_clock_t _stime; | |
70 | } _sigchld; | |
71 | ||
72 | /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ | |
73 | struct { | |
74 | compat_uptr_t _addr; /* faulting insn/memory ref. */ | |
75 | short _addr_lsb; /* LSB of the reported address */ | |
76 | } _sigfault; | |
77 | ||
78 | /* SIGPOLL */ | |
79 | struct { | |
80 | compat_long_t _band; /* POLL_IN, POLL_OUT, POLL_MSG */ | |
81 | int _fd; | |
82 | } _sigpoll; | |
83 | } _sifields; | |
84 | } compat_siginfo_t; | |
85 | ||
86 | struct compat_sigaction { | |
87 | compat_uptr_t sa_handler; | |
88 | compat_ulong_t sa_flags; | |
89 | compat_uptr_t sa_restorer; | |
90 | compat_sigset_t sa_mask; | |
91 | }; | |
92 | ||
93 | struct compat_old_sigaction { | |
94 | compat_uptr_t sa_handler; | |
95 | compat_old_sigset_t sa_mask; | |
96 | compat_ulong_t sa_flags; | |
97 | compat_uptr_t sa_restorer; | |
98 | }; | |
99 | ||
100 | typedef struct compat_sigaltstack { | |
101 | compat_uptr_t ss_sp; | |
102 | int ss_flags; | |
103 | compat_size_t ss_size; | |
104 | } compat_stack_t; | |
105 | ||
106 | struct compat_sigcontext { | |
107 | /* We always set these two fields to 0 */ | |
108 | compat_ulong_t trap_no; | |
109 | compat_ulong_t error_code; | |
110 | ||
111 | compat_ulong_t oldmask; | |
112 | compat_ulong_t arm_r0; | |
113 | compat_ulong_t arm_r1; | |
114 | compat_ulong_t arm_r2; | |
115 | compat_ulong_t arm_r3; | |
116 | compat_ulong_t arm_r4; | |
117 | compat_ulong_t arm_r5; | |
118 | compat_ulong_t arm_r6; | |
119 | compat_ulong_t arm_r7; | |
120 | compat_ulong_t arm_r8; | |
121 | compat_ulong_t arm_r9; | |
122 | compat_ulong_t arm_r10; | |
123 | compat_ulong_t arm_fp; | |
124 | compat_ulong_t arm_ip; | |
125 | compat_ulong_t arm_sp; | |
126 | compat_ulong_t arm_lr; | |
127 | compat_ulong_t arm_pc; | |
128 | compat_ulong_t arm_cpsr; | |
129 | compat_ulong_t fault_address; | |
130 | }; | |
131 | ||
132 | struct compat_ucontext { | |
133 | compat_ulong_t uc_flags; | |
134 | struct compat_ucontext *uc_link; | |
135 | compat_stack_t uc_stack; | |
136 | struct compat_sigcontext uc_mcontext; | |
137 | compat_sigset_t uc_sigmask; | |
138 | int __unused[32 - (sizeof (compat_sigset_t) / sizeof (int))]; | |
139 | compat_ulong_t uc_regspace[128] __attribute__((__aligned__(8))); | |
140 | }; | |
141 | ||
142 | struct compat_vfp_sigframe { | |
143 | compat_ulong_t magic; | |
144 | compat_ulong_t size; | |
145 | struct compat_user_vfp { | |
146 | compat_u64 fpregs[32]; | |
147 | compat_ulong_t fpscr; | |
148 | } ufp; | |
149 | struct compat_user_vfp_exc { | |
150 | compat_ulong_t fpexc; | |
151 | compat_ulong_t fpinst; | |
152 | compat_ulong_t fpinst2; | |
153 | } ufp_exc; | |
154 | } __attribute__((__aligned__(8))); | |
155 | ||
156 | #define VFP_MAGIC 0x56465001 | |
157 | #define VFP_STORAGE_SIZE sizeof(struct compat_vfp_sigframe) | |
158 | ||
159 | struct compat_aux_sigframe { | |
160 | struct compat_vfp_sigframe vfp; | |
161 | ||
162 | /* Something that isn't a valid magic number for any coprocessor. */ | |
163 | unsigned long end_magic; | |
164 | } __attribute__((__aligned__(8))); | |
165 | ||
166 | struct compat_sigframe { | |
167 | struct compat_ucontext uc; | |
168 | compat_ulong_t retcode[2]; | |
169 | }; | |
170 | ||
171 | struct compat_rt_sigframe { | |
172 | struct compat_siginfo info; | |
173 | struct compat_sigframe sig; | |
174 | }; | |
175 | ||
176 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
177 | ||
178 | /* | |
179 | * For ARM syscalls, the syscall number has to be loaded into r7. | |
180 | * We do not support an OABI userspace. | |
181 | */ | |
182 | #define MOV_R7_NR_SIGRETURN (0xe3a07000 | __NR_sigreturn) | |
183 | #define SVC_SYS_SIGRETURN (0xef000000 | __NR_sigreturn) | |
184 | #define MOV_R7_NR_RT_SIGRETURN (0xe3a07000 | __NR_rt_sigreturn) | |
185 | #define SVC_SYS_RT_SIGRETURN (0xef000000 | __NR_rt_sigreturn) | |
186 | ||
187 | /* | |
188 | * For Thumb syscalls, we also pass the syscall number via r7. We therefore | |
189 | * need two 16-bit instructions. | |
190 | */ | |
191 | #define SVC_THUMB_SIGRETURN (((0xdf00 | __NR_sigreturn) << 16) | \ | |
192 | 0x2700 | __NR_sigreturn) | |
193 | #define SVC_THUMB_RT_SIGRETURN (((0xdf00 | __NR_rt_sigreturn) << 16) | \ | |
194 | 0x2700 | __NR_rt_sigreturn) | |
195 | ||
196 | const compat_ulong_t aarch32_sigret_code[6] = { | |
197 | /* | |
198 | * AArch32 sigreturn code. | |
199 | * We don't construct an OABI SWI - instead we just set the imm24 field | |
200 | * to the EABI syscall number so that we create a sane disassembly. | |
201 | */ | |
202 | MOV_R7_NR_SIGRETURN, SVC_SYS_SIGRETURN, SVC_THUMB_SIGRETURN, | |
203 | MOV_R7_NR_RT_SIGRETURN, SVC_SYS_RT_SIGRETURN, SVC_THUMB_RT_SIGRETURN, | |
204 | }; | |
205 | ||
206 | static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set) | |
207 | { | |
208 | compat_sigset_t cset; | |
209 | ||
210 | cset.sig[0] = set->sig[0] & 0xffffffffull; | |
211 | cset.sig[1] = set->sig[0] >> 32; | |
212 | ||
213 | return copy_to_user(uset, &cset, sizeof(*uset)); | |
214 | } | |
215 | ||
216 | static inline int get_sigset_t(sigset_t *set, | |
217 | const compat_sigset_t __user *uset) | |
218 | { | |
219 | compat_sigset_t s32; | |
220 | ||
221 | if (copy_from_user(&s32, uset, sizeof(*uset))) | |
222 | return -EFAULT; | |
223 | ||
224 | set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); | |
225 | return 0; | |
226 | } | |
227 | ||
228 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) | |
229 | { | |
230 | int err; | |
231 | ||
232 | if (!access_ok(VERIFY_WRITE, to, sizeof(*to))) | |
233 | return -EFAULT; | |
234 | ||
235 | /* If you change siginfo_t structure, please be sure | |
236 | * this code is fixed accordingly. | |
237 | * It should never copy any pad contained in the structure | |
238 | * to avoid security leaks, but must copy the generic | |
239 | * 3 ints plus the relevant union member. | |
240 | * This routine must convert siginfo from 64bit to 32bit as well | |
241 | * at the same time. | |
242 | */ | |
243 | err = __put_user(from->si_signo, &to->si_signo); | |
244 | err |= __put_user(from->si_errno, &to->si_errno); | |
245 | err |= __put_user((short)from->si_code, &to->si_code); | |
246 | if (from->si_code < 0) | |
247 | err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, | |
248 | SI_PAD_SIZE); | |
249 | else switch (from->si_code & __SI_MASK) { | |
250 | case __SI_KILL: | |
251 | err |= __put_user(from->si_pid, &to->si_pid); | |
252 | err |= __put_user(from->si_uid, &to->si_uid); | |
253 | break; | |
254 | case __SI_TIMER: | |
255 | err |= __put_user(from->si_tid, &to->si_tid); | |
256 | err |= __put_user(from->si_overrun, &to->si_overrun); | |
257 | err |= __put_user((compat_uptr_t)(unsigned long)from->si_ptr, | |
258 | &to->si_ptr); | |
259 | break; | |
260 | case __SI_POLL: | |
261 | err |= __put_user(from->si_band, &to->si_band); | |
262 | err |= __put_user(from->si_fd, &to->si_fd); | |
263 | break; | |
264 | case __SI_FAULT: | |
265 | err |= __put_user((compat_uptr_t)(unsigned long)from->si_addr, | |
266 | &to->si_addr); | |
267 | #ifdef BUS_MCEERR_AO | |
268 | /* | |
269 | * Other callers might not initialize the si_lsb field, | |
270 | * so check explicitely for the right codes here. | |
271 | */ | |
272 | if (from->si_code == BUS_MCEERR_AR || from->si_code == BUS_MCEERR_AO) | |
273 | err |= __put_user(from->si_addr_lsb, &to->si_addr_lsb); | |
274 | #endif | |
275 | break; | |
276 | case __SI_CHLD: | |
277 | err |= __put_user(from->si_pid, &to->si_pid); | |
278 | err |= __put_user(from->si_uid, &to->si_uid); | |
279 | err |= __put_user(from->si_status, &to->si_status); | |
280 | err |= __put_user(from->si_utime, &to->si_utime); | |
281 | err |= __put_user(from->si_stime, &to->si_stime); | |
282 | break; | |
283 | case __SI_RT: /* This is not generated by the kernel as of now. */ | |
284 | case __SI_MESGQ: /* But this is */ | |
285 | err |= __put_user(from->si_pid, &to->si_pid); | |
286 | err |= __put_user(from->si_uid, &to->si_uid); | |
287 | err |= __put_user((compat_uptr_t)(unsigned long)from->si_ptr, &to->si_ptr); | |
288 | break; | |
289 | default: /* this is just in case for now ... */ | |
290 | err |= __put_user(from->si_pid, &to->si_pid); | |
291 | err |= __put_user(from->si_uid, &to->si_uid); | |
292 | break; | |
293 | } | |
294 | return err; | |
295 | } | |
296 | ||
297 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) | |
298 | { | |
299 | memset(to, 0, sizeof *to); | |
300 | ||
301 | if (copy_from_user(to, from, __ARCH_SI_PREAMBLE_SIZE) || | |
302 | copy_from_user(to->_sifields._pad, | |
303 | from->_sifields._pad, SI_PAD_SIZE)) | |
304 | return -EFAULT; | |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
309 | /* | |
310 | * VFP save/restore code. | |
311 | */ | |
312 | static int compat_preserve_vfp_context(struct compat_vfp_sigframe __user *frame) | |
313 | { | |
314 | struct fpsimd_state *fpsimd = ¤t->thread.fpsimd_state; | |
315 | compat_ulong_t magic = VFP_MAGIC; | |
316 | compat_ulong_t size = VFP_STORAGE_SIZE; | |
317 | compat_ulong_t fpscr, fpexc; | |
318 | int err = 0; | |
319 | ||
320 | /* | |
321 | * Save the hardware registers to the fpsimd_state structure. | |
322 | * Note that this also saves V16-31, which aren't visible | |
323 | * in AArch32. | |
324 | */ | |
325 | fpsimd_save_state(fpsimd); | |
326 | ||
327 | /* Place structure header on the stack */ | |
328 | __put_user_error(magic, &frame->magic, err); | |
329 | __put_user_error(size, &frame->size, err); | |
330 | ||
331 | /* | |
332 | * Now copy the FP registers. Since the registers are packed, | |
333 | * we can copy the prefix we want (V0-V15) as it is. | |
334 | * FIXME: Won't work if big endian. | |
335 | */ | |
336 | err |= __copy_to_user(&frame->ufp.fpregs, fpsimd->vregs, | |
337 | sizeof(frame->ufp.fpregs)); | |
338 | ||
339 | /* Create an AArch32 fpscr from the fpsr and the fpcr. */ | |
340 | fpscr = (fpsimd->fpsr & VFP_FPSCR_STAT_MASK) | | |
341 | (fpsimd->fpcr & VFP_FPSCR_CTRL_MASK); | |
342 | __put_user_error(fpscr, &frame->ufp.fpscr, err); | |
343 | ||
344 | /* | |
345 | * The exception register aren't available so we fake up a | |
346 | * basic FPEXC and zero everything else. | |
347 | */ | |
348 | fpexc = (1 << 30); | |
349 | __put_user_error(fpexc, &frame->ufp_exc.fpexc, err); | |
350 | __put_user_error(0, &frame->ufp_exc.fpinst, err); | |
351 | __put_user_error(0, &frame->ufp_exc.fpinst2, err); | |
352 | ||
353 | return err ? -EFAULT : 0; | |
354 | } | |
355 | ||
356 | static int compat_restore_vfp_context(struct compat_vfp_sigframe __user *frame) | |
357 | { | |
358 | struct fpsimd_state fpsimd; | |
359 | compat_ulong_t magic = VFP_MAGIC; | |
360 | compat_ulong_t size = VFP_STORAGE_SIZE; | |
361 | compat_ulong_t fpscr; | |
362 | int err = 0; | |
363 | ||
364 | __get_user_error(magic, &frame->magic, err); | |
365 | __get_user_error(size, &frame->size, err); | |
366 | ||
367 | if (err) | |
368 | return -EFAULT; | |
369 | if (magic != VFP_MAGIC || size != VFP_STORAGE_SIZE) | |
370 | return -EINVAL; | |
371 | ||
372 | /* | |
373 | * Copy the FP registers into the start of the fpsimd_state. | |
374 | * FIXME: Won't work if big endian. | |
375 | */ | |
376 | err |= __copy_from_user(fpsimd.vregs, frame->ufp.fpregs, | |
377 | sizeof(frame->ufp.fpregs)); | |
378 | ||
379 | /* Extract the fpsr and the fpcr from the fpscr */ | |
380 | __get_user_error(fpscr, &frame->ufp.fpscr, err); | |
381 | fpsimd.fpsr = fpscr & VFP_FPSCR_STAT_MASK; | |
382 | fpsimd.fpcr = fpscr & VFP_FPSCR_CTRL_MASK; | |
383 | ||
384 | /* | |
385 | * We don't need to touch the exception register, so | |
386 | * reload the hardware state. | |
387 | */ | |
388 | if (!err) { | |
389 | preempt_disable(); | |
390 | fpsimd_load_state(&fpsimd); | |
391 | preempt_enable(); | |
392 | } | |
393 | ||
394 | return err ? -EFAULT : 0; | |
395 | } | |
396 | ||
397 | /* | |
398 | * atomically swap in the new signal mask, and wait for a signal. | |
399 | */ | |
400 | asmlinkage int compat_sys_sigsuspend(int restart, compat_ulong_t oldmask, | |
401 | compat_old_sigset_t mask) | |
402 | { | |
403 | sigset_t blocked; | |
404 | ||
405 | siginitset(¤t->blocked, mask); | |
406 | return sigsuspend(&blocked); | |
407 | } | |
408 | ||
409 | asmlinkage int compat_sys_sigaction(int sig, | |
410 | const struct compat_old_sigaction __user *act, | |
411 | struct compat_old_sigaction __user *oact) | |
412 | { | |
413 | struct k_sigaction new_ka, old_ka; | |
414 | int ret; | |
415 | compat_old_sigset_t mask; | |
416 | compat_uptr_t handler, restorer; | |
417 | ||
418 | if (act) { | |
419 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
420 | __get_user(handler, &act->sa_handler) || | |
421 | __get_user(restorer, &act->sa_restorer) || | |
422 | __get_user(new_ka.sa.sa_flags, &act->sa_flags) || | |
423 | __get_user(mask, &act->sa_mask)) | |
424 | return -EFAULT; | |
425 | ||
426 | new_ka.sa.sa_handler = compat_ptr(handler); | |
427 | new_ka.sa.sa_restorer = compat_ptr(restorer); | |
428 | siginitset(&new_ka.sa.sa_mask, mask); | |
429 | } | |
430 | ||
431 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
432 | ||
433 | if (!ret && oact) { | |
434 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
435 | __put_user(ptr_to_compat(old_ka.sa.sa_handler), | |
436 | &oact->sa_handler) || | |
437 | __put_user(ptr_to_compat(old_ka.sa.sa_restorer), | |
438 | &oact->sa_restorer) || | |
439 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
440 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
441 | return -EFAULT; | |
442 | } | |
443 | ||
444 | return ret; | |
445 | } | |
446 | ||
447 | asmlinkage int compat_sys_rt_sigaction(int sig, | |
448 | const struct compat_sigaction __user *act, | |
449 | struct compat_sigaction __user *oact, | |
450 | compat_size_t sigsetsize) | |
451 | { | |
452 | struct k_sigaction new_ka, old_ka; | |
453 | int ret; | |
454 | ||
455 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
456 | if (sigsetsize != sizeof(compat_sigset_t)) | |
457 | return -EINVAL; | |
458 | ||
459 | if (act) { | |
460 | compat_uptr_t handler, restorer; | |
461 | ||
462 | ret = get_user(handler, &act->sa_handler); | |
463 | new_ka.sa.sa_handler = compat_ptr(handler); | |
464 | ret |= get_user(restorer, &act->sa_restorer); | |
465 | new_ka.sa.sa_restorer = compat_ptr(restorer); | |
466 | ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask); | |
467 | ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
468 | if (ret) | |
469 | return -EFAULT; | |
470 | } | |
471 | ||
472 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
473 | if (!ret && oact) { | |
474 | ret = put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler); | |
475 | ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask); | |
476 | ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
477 | } | |
478 | return ret; | |
479 | } | |
480 | ||
481 | int compat_do_sigaltstack(compat_uptr_t compat_uss, compat_uptr_t compat_uoss, | |
482 | compat_ulong_t sp) | |
483 | { | |
484 | compat_stack_t __user *newstack = compat_ptr(compat_uss); | |
485 | compat_stack_t __user *oldstack = compat_ptr(compat_uoss); | |
486 | compat_uptr_t ss_sp; | |
487 | int ret; | |
488 | mm_segment_t old_fs; | |
489 | stack_t uss, uoss; | |
490 | ||
491 | /* Marshall the compat new stack into a stack_t */ | |
492 | if (newstack) { | |
493 | if (get_user(ss_sp, &newstack->ss_sp) || | |
494 | __get_user(uss.ss_flags, &newstack->ss_flags) || | |
495 | __get_user(uss.ss_size, &newstack->ss_size)) | |
496 | return -EFAULT; | |
497 | uss.ss_sp = compat_ptr(ss_sp); | |
498 | } | |
499 | ||
500 | old_fs = get_fs(); | |
501 | set_fs(KERNEL_DS); | |
502 | /* The __user pointer casts are valid because of the set_fs() */ | |
503 | ret = do_sigaltstack( | |
504 | newstack ? (stack_t __user *) &uss : NULL, | |
505 | oldstack ? (stack_t __user *) &uoss : NULL, | |
506 | (unsigned long)sp); | |
507 | set_fs(old_fs); | |
508 | ||
509 | /* Convert the old stack_t into a compat stack. */ | |
510 | if (!ret && oldstack && | |
511 | (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) || | |
512 | __put_user(uoss.ss_flags, &oldstack->ss_flags) || | |
513 | __put_user(uoss.ss_size, &oldstack->ss_size))) | |
514 | return -EFAULT; | |
515 | return ret; | |
516 | } | |
517 | ||
518 | static int compat_restore_sigframe(struct pt_regs *regs, | |
519 | struct compat_sigframe __user *sf) | |
520 | { | |
521 | int err; | |
522 | sigset_t set; | |
523 | struct compat_aux_sigframe __user *aux; | |
524 | ||
525 | err = get_sigset_t(&set, &sf->uc.uc_sigmask); | |
526 | if (err == 0) { | |
527 | sigdelsetmask(&set, ~_BLOCKABLE); | |
528 | set_current_blocked(&set); | |
529 | } | |
530 | ||
531 | __get_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err); | |
532 | __get_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err); | |
533 | __get_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err); | |
534 | __get_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err); | |
535 | __get_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err); | |
536 | __get_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err); | |
537 | __get_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err); | |
538 | __get_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err); | |
539 | __get_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err); | |
540 | __get_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err); | |
541 | __get_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err); | |
542 | __get_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err); | |
543 | __get_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err); | |
544 | __get_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err); | |
545 | __get_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err); | |
546 | __get_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err); | |
547 | __get_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err); | |
548 | ||
549 | /* | |
550 | * Avoid compat_sys_sigreturn() restarting. | |
551 | */ | |
552 | regs->syscallno = ~0UL; | |
553 | ||
554 | err |= !valid_user_regs(®s->user_regs); | |
555 | ||
556 | aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace; | |
557 | if (err == 0) | |
558 | err |= compat_restore_vfp_context(&aux->vfp); | |
559 | ||
560 | return err; | |
561 | } | |
562 | ||
563 | asmlinkage int compat_sys_sigreturn(struct pt_regs *regs) | |
564 | { | |
565 | struct compat_sigframe __user *frame; | |
566 | ||
567 | /* Always make any pending restarted system calls return -EINTR */ | |
568 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
569 | ||
570 | /* | |
571 | * Since we stacked the signal on a 64-bit boundary, | |
572 | * then 'sp' should be word aligned here. If it's | |
573 | * not, then the user is trying to mess with us. | |
574 | */ | |
575 | if (regs->compat_sp & 7) | |
576 | goto badframe; | |
577 | ||
578 | frame = (struct compat_sigframe __user *)regs->compat_sp; | |
579 | ||
580 | if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) | |
581 | goto badframe; | |
582 | ||
583 | if (compat_restore_sigframe(regs, frame)) | |
584 | goto badframe; | |
585 | ||
586 | return regs->regs[0]; | |
587 | ||
588 | badframe: | |
589 | if (show_unhandled_signals) | |
590 | pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n", | |
591 | current->comm, task_pid_nr(current), __func__, | |
592 | regs->pc, regs->sp); | |
593 | force_sig(SIGSEGV, current); | |
594 | return 0; | |
595 | } | |
596 | ||
597 | asmlinkage int compat_sys_rt_sigreturn(struct pt_regs *regs) | |
598 | { | |
599 | struct compat_rt_sigframe __user *frame; | |
600 | ||
601 | /* Always make any pending restarted system calls return -EINTR */ | |
602 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
603 | ||
604 | /* | |
605 | * Since we stacked the signal on a 64-bit boundary, | |
606 | * then 'sp' should be word aligned here. If it's | |
607 | * not, then the user is trying to mess with us. | |
608 | */ | |
609 | if (regs->compat_sp & 7) | |
610 | goto badframe; | |
611 | ||
612 | frame = (struct compat_rt_sigframe __user *)regs->compat_sp; | |
613 | ||
614 | if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) | |
615 | goto badframe; | |
616 | ||
617 | if (compat_restore_sigframe(regs, &frame->sig)) | |
618 | goto badframe; | |
619 | ||
620 | if (compat_do_sigaltstack(ptr_to_compat(&frame->sig.uc.uc_stack), | |
621 | ptr_to_compat((void __user *)NULL), | |
622 | regs->compat_sp) == -EFAULT) | |
623 | goto badframe; | |
624 | ||
625 | return regs->regs[0]; | |
626 | ||
627 | badframe: | |
628 | if (show_unhandled_signals) | |
629 | pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n", | |
630 | current->comm, task_pid_nr(current), __func__, | |
631 | regs->pc, regs->sp); | |
632 | force_sig(SIGSEGV, current); | |
633 | return 0; | |
634 | } | |
635 | ||
636 | static inline void __user *compat_get_sigframe(struct k_sigaction *ka, | |
637 | struct pt_regs *regs, | |
638 | int framesize) | |
639 | { | |
640 | compat_ulong_t sp = regs->compat_sp; | |
641 | void __user *frame; | |
642 | ||
643 | /* | |
644 | * This is the X/Open sanctioned signal stack switching. | |
645 | */ | |
646 | if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp)) | |
647 | sp = current->sas_ss_sp + current->sas_ss_size; | |
648 | ||
649 | /* | |
650 | * ATPCS B01 mandates 8-byte alignment | |
651 | */ | |
652 | frame = compat_ptr((compat_uptr_t)((sp - framesize) & ~7)); | |
653 | ||
654 | /* | |
655 | * Check that we can actually write to the signal frame. | |
656 | */ | |
657 | if (!access_ok(VERIFY_WRITE, frame, framesize)) | |
658 | frame = NULL; | |
659 | ||
660 | return frame; | |
661 | } | |
662 | ||
663 | static int compat_setup_return(struct pt_regs *regs, struct k_sigaction *ka, | |
664 | compat_ulong_t __user *rc, void __user *frame, | |
665 | int usig) | |
666 | { | |
667 | compat_ulong_t handler = ptr_to_compat(ka->sa.sa_handler); | |
668 | compat_ulong_t retcode; | |
669 | compat_ulong_t spsr = regs->pstate & ~PSR_f; | |
670 | int thumb; | |
671 | ||
672 | /* Check if the handler is written for ARM or Thumb */ | |
673 | thumb = handler & 1; | |
674 | ||
675 | if (thumb) { | |
676 | spsr |= COMPAT_PSR_T_BIT; | |
677 | spsr &= ~COMPAT_PSR_IT_MASK; | |
678 | } else { | |
679 | spsr &= ~COMPAT_PSR_T_BIT; | |
680 | } | |
681 | ||
682 | if (ka->sa.sa_flags & SA_RESTORER) { | |
683 | retcode = ptr_to_compat(ka->sa.sa_restorer); | |
684 | } else { | |
685 | /* Set up sigreturn pointer */ | |
686 | unsigned int idx = thumb << 1; | |
687 | ||
688 | if (ka->sa.sa_flags & SA_SIGINFO) | |
689 | idx += 3; | |
690 | ||
691 | retcode = AARCH32_VECTORS_BASE + | |
692 | AARCH32_KERN_SIGRET_CODE_OFFSET + | |
693 | (idx << 2) + thumb; | |
694 | } | |
695 | ||
696 | regs->regs[0] = usig; | |
697 | regs->compat_sp = ptr_to_compat(frame); | |
698 | regs->compat_lr = retcode; | |
699 | regs->pc = handler; | |
700 | regs->pstate = spsr; | |
701 | ||
702 | return 0; | |
703 | } | |
704 | ||
705 | static int compat_setup_sigframe(struct compat_sigframe __user *sf, | |
706 | struct pt_regs *regs, sigset_t *set) | |
707 | { | |
708 | struct compat_aux_sigframe __user *aux; | |
709 | int err = 0; | |
710 | ||
711 | __put_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err); | |
712 | __put_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err); | |
713 | __put_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err); | |
714 | __put_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err); | |
715 | __put_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err); | |
716 | __put_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err); | |
717 | __put_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err); | |
718 | __put_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err); | |
719 | __put_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err); | |
720 | __put_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err); | |
721 | __put_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err); | |
722 | __put_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err); | |
723 | __put_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err); | |
724 | __put_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err); | |
725 | __put_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err); | |
726 | __put_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err); | |
727 | __put_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err); | |
728 | ||
729 | __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.trap_no, err); | |
730 | __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.error_code, err); | |
731 | __put_user_error(current->thread.fault_address, &sf->uc.uc_mcontext.fault_address, err); | |
732 | __put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err); | |
733 | ||
734 | err |= put_sigset_t(&sf->uc.uc_sigmask, set); | |
735 | ||
736 | aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace; | |
737 | ||
738 | if (err == 0) | |
739 | err |= compat_preserve_vfp_context(&aux->vfp); | |
740 | __put_user_error(0, &aux->end_magic, err); | |
741 | ||
742 | return err; | |
743 | } | |
744 | ||
745 | /* | |
746 | * 32-bit signal handling routines called from signal.c | |
747 | */ | |
748 | int compat_setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info, | |
749 | sigset_t *set, struct pt_regs *regs) | |
750 | { | |
751 | struct compat_rt_sigframe __user *frame; | |
752 | compat_stack_t stack; | |
753 | int err = 0; | |
754 | ||
755 | frame = compat_get_sigframe(ka, regs, sizeof(*frame)); | |
756 | ||
757 | if (!frame) | |
758 | return 1; | |
759 | ||
760 | err |= copy_siginfo_to_user32(&frame->info, info); | |
761 | ||
762 | __put_user_error(0, &frame->sig.uc.uc_flags, err); | |
763 | __put_user_error(NULL, &frame->sig.uc.uc_link, err); | |
764 | ||
765 | memset(&stack, 0, sizeof(stack)); | |
766 | stack.ss_sp = (compat_uptr_t)current->sas_ss_sp; | |
767 | stack.ss_flags = sas_ss_flags(regs->compat_sp); | |
768 | stack.ss_size = current->sas_ss_size; | |
769 | err |= __copy_to_user(&frame->sig.uc.uc_stack, &stack, sizeof(stack)); | |
770 | ||
771 | err |= compat_setup_sigframe(&frame->sig, regs, set); | |
772 | if (err == 0) | |
773 | err = compat_setup_return(regs, ka, frame->sig.retcode, frame, | |
774 | usig); | |
775 | ||
776 | if (err == 0) { | |
777 | regs->regs[1] = (compat_ulong_t)(unsigned long)&frame->info; | |
778 | regs->regs[2] = (compat_ulong_t)(unsigned long)&frame->sig.uc; | |
779 | } | |
780 | ||
781 | return err; | |
782 | } | |
783 | ||
784 | int compat_setup_frame(int usig, struct k_sigaction *ka, sigset_t *set, | |
785 | struct pt_regs *regs) | |
786 | { | |
787 | struct compat_sigframe __user *frame; | |
788 | int err = 0; | |
789 | ||
790 | frame = compat_get_sigframe(ka, regs, sizeof(*frame)); | |
791 | ||
792 | if (!frame) | |
793 | return 1; | |
794 | ||
795 | __put_user_error(0x5ac3c35a, &frame->uc.uc_flags, err); | |
796 | ||
797 | err |= compat_setup_sigframe(frame, regs, set); | |
798 | if (err == 0) | |
799 | err = compat_setup_return(regs, ka, frame->retcode, frame, usig); | |
800 | ||
801 | return err; | |
802 | } | |
803 | ||
804 | /* | |
805 | * RT signals don't have generic compat wrappers. | |
806 | * See arch/powerpc/kernel/signal_32.c | |
807 | */ | |
808 | asmlinkage int compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set, | |
809 | compat_sigset_t __user *oset, | |
810 | compat_size_t sigsetsize) | |
811 | { | |
812 | sigset_t s; | |
813 | sigset_t __user *up; | |
814 | int ret; | |
815 | mm_segment_t old_fs = get_fs(); | |
816 | ||
817 | if (set) { | |
818 | if (get_sigset_t(&s, set)) | |
819 | return -EFAULT; | |
820 | } | |
821 | ||
822 | set_fs(KERNEL_DS); | |
823 | /* This is valid because of the set_fs() */ | |
824 | up = (sigset_t __user *) &s; | |
825 | ret = sys_rt_sigprocmask(how, set ? up : NULL, oset ? up : NULL, | |
826 | sigsetsize); | |
827 | set_fs(old_fs); | |
828 | if (ret) | |
829 | return ret; | |
830 | if (oset) { | |
831 | if (put_sigset_t(oset, &s)) | |
832 | return -EFAULT; | |
833 | } | |
834 | return 0; | |
835 | } | |
836 | ||
837 | asmlinkage int compat_sys_rt_sigpending(compat_sigset_t __user *set, | |
838 | compat_size_t sigsetsize) | |
839 | { | |
840 | sigset_t s; | |
841 | int ret; | |
842 | mm_segment_t old_fs = get_fs(); | |
843 | ||
844 | set_fs(KERNEL_DS); | |
845 | /* The __user pointer cast is valid because of the set_fs() */ | |
846 | ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize); | |
847 | set_fs(old_fs); | |
848 | if (!ret) { | |
849 | if (put_sigset_t(set, &s)) | |
850 | return -EFAULT; | |
851 | } | |
852 | return ret; | |
853 | } | |
854 | ||
855 | asmlinkage int compat_sys_rt_sigqueueinfo(int pid, int sig, | |
856 | compat_siginfo_t __user *uinfo) | |
857 | { | |
858 | siginfo_t info; | |
859 | int ret; | |
860 | mm_segment_t old_fs = get_fs(); | |
861 | ||
862 | ret = copy_siginfo_from_user32(&info, uinfo); | |
863 | if (unlikely(ret)) | |
864 | return ret; | |
865 | ||
866 | set_fs (KERNEL_DS); | |
867 | /* The __user pointer cast is valid because of the set_fs() */ | |
868 | ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *) &info); | |
869 | set_fs (old_fs); | |
870 | return ret; | |
871 | } | |
872 | ||
873 | void compat_setup_restart_syscall(struct pt_regs *regs) | |
874 | { | |
875 | regs->regs[7] = __NR_restart_syscall; | |
876 | } |