Commit | Line | Data |
---|---|---|
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 | ||
3dd681d9 WD |
21 | #include <linux/compat.h> |
22 | #include <linux/signal.h> | |
23 | #include <linux/syscalls.h> | |
24 | #include <linux/ratelimit.h> | |
25 | ||
26 | #include <asm/fpsimd.h> | |
27 | #include <asm/signal32.h> | |
28 | #include <asm/uaccess.h> | |
f3d447a9 | 29 | #include <asm/unistd32.h> |
3dd681d9 | 30 | |
3dd681d9 WD |
31 | struct compat_sigaction { |
32 | compat_uptr_t sa_handler; | |
33 | compat_ulong_t sa_flags; | |
34 | compat_uptr_t sa_restorer; | |
35 | compat_sigset_t sa_mask; | |
36 | }; | |
37 | ||
38 | struct compat_old_sigaction { | |
39 | compat_uptr_t sa_handler; | |
40 | compat_old_sigset_t sa_mask; | |
41 | compat_ulong_t sa_flags; | |
42 | compat_uptr_t sa_restorer; | |
43 | }; | |
44 | ||
45 | typedef struct compat_sigaltstack { | |
46 | compat_uptr_t ss_sp; | |
47 | int ss_flags; | |
48 | compat_size_t ss_size; | |
49 | } compat_stack_t; | |
50 | ||
51 | struct compat_sigcontext { | |
52 | /* We always set these two fields to 0 */ | |
53 | compat_ulong_t trap_no; | |
54 | compat_ulong_t error_code; | |
55 | ||
56 | compat_ulong_t oldmask; | |
57 | compat_ulong_t arm_r0; | |
58 | compat_ulong_t arm_r1; | |
59 | compat_ulong_t arm_r2; | |
60 | compat_ulong_t arm_r3; | |
61 | compat_ulong_t arm_r4; | |
62 | compat_ulong_t arm_r5; | |
63 | compat_ulong_t arm_r6; | |
64 | compat_ulong_t arm_r7; | |
65 | compat_ulong_t arm_r8; | |
66 | compat_ulong_t arm_r9; | |
67 | compat_ulong_t arm_r10; | |
68 | compat_ulong_t arm_fp; | |
69 | compat_ulong_t arm_ip; | |
70 | compat_ulong_t arm_sp; | |
71 | compat_ulong_t arm_lr; | |
72 | compat_ulong_t arm_pc; | |
73 | compat_ulong_t arm_cpsr; | |
74 | compat_ulong_t fault_address; | |
75 | }; | |
76 | ||
77 | struct compat_ucontext { | |
78 | compat_ulong_t uc_flags; | |
79 | struct compat_ucontext *uc_link; | |
80 | compat_stack_t uc_stack; | |
81 | struct compat_sigcontext uc_mcontext; | |
82 | compat_sigset_t uc_sigmask; | |
83 | int __unused[32 - (sizeof (compat_sigset_t) / sizeof (int))]; | |
84 | compat_ulong_t uc_regspace[128] __attribute__((__aligned__(8))); | |
85 | }; | |
86 | ||
87 | struct compat_vfp_sigframe { | |
88 | compat_ulong_t magic; | |
89 | compat_ulong_t size; | |
90 | struct compat_user_vfp { | |
91 | compat_u64 fpregs[32]; | |
92 | compat_ulong_t fpscr; | |
93 | } ufp; | |
94 | struct compat_user_vfp_exc { | |
95 | compat_ulong_t fpexc; | |
96 | compat_ulong_t fpinst; | |
97 | compat_ulong_t fpinst2; | |
98 | } ufp_exc; | |
99 | } __attribute__((__aligned__(8))); | |
100 | ||
101 | #define VFP_MAGIC 0x56465001 | |
102 | #define VFP_STORAGE_SIZE sizeof(struct compat_vfp_sigframe) | |
103 | ||
104 | struct compat_aux_sigframe { | |
105 | struct compat_vfp_sigframe vfp; | |
106 | ||
107 | /* Something that isn't a valid magic number for any coprocessor. */ | |
108 | unsigned long end_magic; | |
109 | } __attribute__((__aligned__(8))); | |
110 | ||
111 | struct compat_sigframe { | |
112 | struct compat_ucontext uc; | |
113 | compat_ulong_t retcode[2]; | |
114 | }; | |
115 | ||
116 | struct compat_rt_sigframe { | |
117 | struct compat_siginfo info; | |
118 | struct compat_sigframe sig; | |
119 | }; | |
120 | ||
121 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
122 | ||
123 | /* | |
124 | * For ARM syscalls, the syscall number has to be loaded into r7. | |
125 | * We do not support an OABI userspace. | |
126 | */ | |
4ed27ecf CM |
127 | #define MOV_R7_NR_SIGRETURN (0xe3a07000 | __NR_compat_sigreturn) |
128 | #define SVC_SYS_SIGRETURN (0xef000000 | __NR_compat_sigreturn) | |
129 | #define MOV_R7_NR_RT_SIGRETURN (0xe3a07000 | __NR_compat_rt_sigreturn) | |
130 | #define SVC_SYS_RT_SIGRETURN (0xef000000 | __NR_compat_rt_sigreturn) | |
3dd681d9 WD |
131 | |
132 | /* | |
133 | * For Thumb syscalls, we also pass the syscall number via r7. We therefore | |
134 | * need two 16-bit instructions. | |
135 | */ | |
4ed27ecf CM |
136 | #define SVC_THUMB_SIGRETURN (((0xdf00 | __NR_compat_sigreturn) << 16) | \ |
137 | 0x2700 | __NR_compat_sigreturn) | |
138 | #define SVC_THUMB_RT_SIGRETURN (((0xdf00 | __NR_compat_rt_sigreturn) << 16) | \ | |
139 | 0x2700 | __NR_compat_rt_sigreturn) | |
3dd681d9 WD |
140 | |
141 | const compat_ulong_t aarch32_sigret_code[6] = { | |
142 | /* | |
143 | * AArch32 sigreturn code. | |
144 | * We don't construct an OABI SWI - instead we just set the imm24 field | |
145 | * to the EABI syscall number so that we create a sane disassembly. | |
146 | */ | |
147 | MOV_R7_NR_SIGRETURN, SVC_SYS_SIGRETURN, SVC_THUMB_SIGRETURN, | |
148 | MOV_R7_NR_RT_SIGRETURN, SVC_SYS_RT_SIGRETURN, SVC_THUMB_RT_SIGRETURN, | |
149 | }; | |
150 | ||
151 | static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set) | |
152 | { | |
153 | compat_sigset_t cset; | |
154 | ||
155 | cset.sig[0] = set->sig[0] & 0xffffffffull; | |
156 | cset.sig[1] = set->sig[0] >> 32; | |
157 | ||
158 | return copy_to_user(uset, &cset, sizeof(*uset)); | |
159 | } | |
160 | ||
161 | static inline int get_sigset_t(sigset_t *set, | |
162 | const compat_sigset_t __user *uset) | |
163 | { | |
164 | compat_sigset_t s32; | |
165 | ||
166 | if (copy_from_user(&s32, uset, sizeof(*uset))) | |
167 | return -EFAULT; | |
168 | ||
169 | set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); | |
170 | return 0; | |
171 | } | |
172 | ||
173 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) | |
174 | { | |
175 | int err; | |
176 | ||
177 | if (!access_ok(VERIFY_WRITE, to, sizeof(*to))) | |
178 | return -EFAULT; | |
179 | ||
180 | /* If you change siginfo_t structure, please be sure | |
181 | * this code is fixed accordingly. | |
182 | * It should never copy any pad contained in the structure | |
183 | * to avoid security leaks, but must copy the generic | |
184 | * 3 ints plus the relevant union member. | |
185 | * This routine must convert siginfo from 64bit to 32bit as well | |
186 | * at the same time. | |
187 | */ | |
188 | err = __put_user(from->si_signo, &to->si_signo); | |
189 | err |= __put_user(from->si_errno, &to->si_errno); | |
190 | err |= __put_user((short)from->si_code, &to->si_code); | |
191 | if (from->si_code < 0) | |
192 | err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, | |
193 | SI_PAD_SIZE); | |
194 | else switch (from->si_code & __SI_MASK) { | |
195 | case __SI_KILL: | |
196 | err |= __put_user(from->si_pid, &to->si_pid); | |
197 | err |= __put_user(from->si_uid, &to->si_uid); | |
198 | break; | |
199 | case __SI_TIMER: | |
200 | err |= __put_user(from->si_tid, &to->si_tid); | |
201 | err |= __put_user(from->si_overrun, &to->si_overrun); | |
202 | err |= __put_user((compat_uptr_t)(unsigned long)from->si_ptr, | |
203 | &to->si_ptr); | |
204 | break; | |
205 | case __SI_POLL: | |
206 | err |= __put_user(from->si_band, &to->si_band); | |
207 | err |= __put_user(from->si_fd, &to->si_fd); | |
208 | break; | |
209 | case __SI_FAULT: | |
210 | err |= __put_user((compat_uptr_t)(unsigned long)from->si_addr, | |
211 | &to->si_addr); | |
212 | #ifdef BUS_MCEERR_AO | |
213 | /* | |
214 | * Other callers might not initialize the si_lsb field, | |
215 | * so check explicitely for the right codes here. | |
216 | */ | |
217 | if (from->si_code == BUS_MCEERR_AR || from->si_code == BUS_MCEERR_AO) | |
218 | err |= __put_user(from->si_addr_lsb, &to->si_addr_lsb); | |
219 | #endif | |
220 | break; | |
221 | case __SI_CHLD: | |
222 | err |= __put_user(from->si_pid, &to->si_pid); | |
223 | err |= __put_user(from->si_uid, &to->si_uid); | |
224 | err |= __put_user(from->si_status, &to->si_status); | |
225 | err |= __put_user(from->si_utime, &to->si_utime); | |
226 | err |= __put_user(from->si_stime, &to->si_stime); | |
227 | break; | |
228 | case __SI_RT: /* This is not generated by the kernel as of now. */ | |
229 | case __SI_MESGQ: /* But this is */ | |
230 | err |= __put_user(from->si_pid, &to->si_pid); | |
231 | err |= __put_user(from->si_uid, &to->si_uid); | |
232 | err |= __put_user((compat_uptr_t)(unsigned long)from->si_ptr, &to->si_ptr); | |
233 | break; | |
234 | default: /* this is just in case for now ... */ | |
235 | err |= __put_user(from->si_pid, &to->si_pid); | |
236 | err |= __put_user(from->si_uid, &to->si_uid); | |
237 | break; | |
238 | } | |
239 | return err; | |
240 | } | |
241 | ||
242 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) | |
243 | { | |
244 | memset(to, 0, sizeof *to); | |
245 | ||
246 | if (copy_from_user(to, from, __ARCH_SI_PREAMBLE_SIZE) || | |
247 | copy_from_user(to->_sifields._pad, | |
248 | from->_sifields._pad, SI_PAD_SIZE)) | |
249 | return -EFAULT; | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
254 | /* | |
255 | * VFP save/restore code. | |
256 | */ | |
257 | static int compat_preserve_vfp_context(struct compat_vfp_sigframe __user *frame) | |
258 | { | |
259 | struct fpsimd_state *fpsimd = ¤t->thread.fpsimd_state; | |
260 | compat_ulong_t magic = VFP_MAGIC; | |
261 | compat_ulong_t size = VFP_STORAGE_SIZE; | |
262 | compat_ulong_t fpscr, fpexc; | |
263 | int err = 0; | |
264 | ||
265 | /* | |
266 | * Save the hardware registers to the fpsimd_state structure. | |
267 | * Note that this also saves V16-31, which aren't visible | |
268 | * in AArch32. | |
269 | */ | |
270 | fpsimd_save_state(fpsimd); | |
271 | ||
272 | /* Place structure header on the stack */ | |
273 | __put_user_error(magic, &frame->magic, err); | |
274 | __put_user_error(size, &frame->size, err); | |
275 | ||
276 | /* | |
277 | * Now copy the FP registers. Since the registers are packed, | |
278 | * we can copy the prefix we want (V0-V15) as it is. | |
279 | * FIXME: Won't work if big endian. | |
280 | */ | |
281 | err |= __copy_to_user(&frame->ufp.fpregs, fpsimd->vregs, | |
282 | sizeof(frame->ufp.fpregs)); | |
283 | ||
284 | /* Create an AArch32 fpscr from the fpsr and the fpcr. */ | |
285 | fpscr = (fpsimd->fpsr & VFP_FPSCR_STAT_MASK) | | |
286 | (fpsimd->fpcr & VFP_FPSCR_CTRL_MASK); | |
287 | __put_user_error(fpscr, &frame->ufp.fpscr, err); | |
288 | ||
289 | /* | |
290 | * The exception register aren't available so we fake up a | |
291 | * basic FPEXC and zero everything else. | |
292 | */ | |
293 | fpexc = (1 << 30); | |
294 | __put_user_error(fpexc, &frame->ufp_exc.fpexc, err); | |
295 | __put_user_error(0, &frame->ufp_exc.fpinst, err); | |
296 | __put_user_error(0, &frame->ufp_exc.fpinst2, err); | |
297 | ||
298 | return err ? -EFAULT : 0; | |
299 | } | |
300 | ||
301 | static int compat_restore_vfp_context(struct compat_vfp_sigframe __user *frame) | |
302 | { | |
303 | struct fpsimd_state fpsimd; | |
304 | compat_ulong_t magic = VFP_MAGIC; | |
305 | compat_ulong_t size = VFP_STORAGE_SIZE; | |
306 | compat_ulong_t fpscr; | |
307 | int err = 0; | |
308 | ||
309 | __get_user_error(magic, &frame->magic, err); | |
310 | __get_user_error(size, &frame->size, err); | |
311 | ||
312 | if (err) | |
313 | return -EFAULT; | |
314 | if (magic != VFP_MAGIC || size != VFP_STORAGE_SIZE) | |
315 | return -EINVAL; | |
316 | ||
317 | /* | |
318 | * Copy the FP registers into the start of the fpsimd_state. | |
319 | * FIXME: Won't work if big endian. | |
320 | */ | |
321 | err |= __copy_from_user(fpsimd.vregs, frame->ufp.fpregs, | |
322 | sizeof(frame->ufp.fpregs)); | |
323 | ||
324 | /* Extract the fpsr and the fpcr from the fpscr */ | |
325 | __get_user_error(fpscr, &frame->ufp.fpscr, err); | |
326 | fpsimd.fpsr = fpscr & VFP_FPSCR_STAT_MASK; | |
327 | fpsimd.fpcr = fpscr & VFP_FPSCR_CTRL_MASK; | |
328 | ||
329 | /* | |
330 | * We don't need to touch the exception register, so | |
331 | * reload the hardware state. | |
332 | */ | |
333 | if (!err) { | |
334 | preempt_disable(); | |
335 | fpsimd_load_state(&fpsimd); | |
336 | preempt_enable(); | |
337 | } | |
338 | ||
339 | return err ? -EFAULT : 0; | |
340 | } | |
341 | ||
342 | /* | |
343 | * atomically swap in the new signal mask, and wait for a signal. | |
344 | */ | |
345 | asmlinkage int compat_sys_sigsuspend(int restart, compat_ulong_t oldmask, | |
346 | compat_old_sigset_t mask) | |
347 | { | |
348 | sigset_t blocked; | |
349 | ||
350 | siginitset(¤t->blocked, mask); | |
351 | return sigsuspend(&blocked); | |
352 | } | |
353 | ||
354 | asmlinkage int compat_sys_sigaction(int sig, | |
355 | const struct compat_old_sigaction __user *act, | |
356 | struct compat_old_sigaction __user *oact) | |
357 | { | |
358 | struct k_sigaction new_ka, old_ka; | |
359 | int ret; | |
360 | compat_old_sigset_t mask; | |
361 | compat_uptr_t handler, restorer; | |
362 | ||
363 | if (act) { | |
364 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
365 | __get_user(handler, &act->sa_handler) || | |
366 | __get_user(restorer, &act->sa_restorer) || | |
367 | __get_user(new_ka.sa.sa_flags, &act->sa_flags) || | |
368 | __get_user(mask, &act->sa_mask)) | |
369 | return -EFAULT; | |
370 | ||
371 | new_ka.sa.sa_handler = compat_ptr(handler); | |
372 | new_ka.sa.sa_restorer = compat_ptr(restorer); | |
373 | siginitset(&new_ka.sa.sa_mask, mask); | |
374 | } | |
375 | ||
376 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
377 | ||
378 | if (!ret && oact) { | |
379 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
380 | __put_user(ptr_to_compat(old_ka.sa.sa_handler), | |
381 | &oact->sa_handler) || | |
382 | __put_user(ptr_to_compat(old_ka.sa.sa_restorer), | |
383 | &oact->sa_restorer) || | |
384 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
385 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
386 | return -EFAULT; | |
387 | } | |
388 | ||
389 | return ret; | |
390 | } | |
391 | ||
392 | asmlinkage int compat_sys_rt_sigaction(int sig, | |
393 | const struct compat_sigaction __user *act, | |
394 | struct compat_sigaction __user *oact, | |
395 | compat_size_t sigsetsize) | |
396 | { | |
397 | struct k_sigaction new_ka, old_ka; | |
398 | int ret; | |
399 | ||
400 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
401 | if (sigsetsize != sizeof(compat_sigset_t)) | |
402 | return -EINVAL; | |
403 | ||
404 | if (act) { | |
405 | compat_uptr_t handler, restorer; | |
406 | ||
407 | ret = get_user(handler, &act->sa_handler); | |
408 | new_ka.sa.sa_handler = compat_ptr(handler); | |
409 | ret |= get_user(restorer, &act->sa_restorer); | |
410 | new_ka.sa.sa_restorer = compat_ptr(restorer); | |
411 | ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask); | |
412 | ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
413 | if (ret) | |
414 | return -EFAULT; | |
415 | } | |
416 | ||
417 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
418 | if (!ret && oact) { | |
419 | ret = put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler); | |
420 | ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask); | |
421 | ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
422 | } | |
423 | return ret; | |
424 | } | |
425 | ||
426 | int compat_do_sigaltstack(compat_uptr_t compat_uss, compat_uptr_t compat_uoss, | |
427 | compat_ulong_t sp) | |
428 | { | |
429 | compat_stack_t __user *newstack = compat_ptr(compat_uss); | |
430 | compat_stack_t __user *oldstack = compat_ptr(compat_uoss); | |
431 | compat_uptr_t ss_sp; | |
432 | int ret; | |
433 | mm_segment_t old_fs; | |
434 | stack_t uss, uoss; | |
435 | ||
436 | /* Marshall the compat new stack into a stack_t */ | |
437 | if (newstack) { | |
438 | if (get_user(ss_sp, &newstack->ss_sp) || | |
439 | __get_user(uss.ss_flags, &newstack->ss_flags) || | |
440 | __get_user(uss.ss_size, &newstack->ss_size)) | |
441 | return -EFAULT; | |
442 | uss.ss_sp = compat_ptr(ss_sp); | |
443 | } | |
444 | ||
445 | old_fs = get_fs(); | |
446 | set_fs(KERNEL_DS); | |
447 | /* The __user pointer casts are valid because of the set_fs() */ | |
448 | ret = do_sigaltstack( | |
449 | newstack ? (stack_t __user *) &uss : NULL, | |
450 | oldstack ? (stack_t __user *) &uoss : NULL, | |
451 | (unsigned long)sp); | |
452 | set_fs(old_fs); | |
453 | ||
454 | /* Convert the old stack_t into a compat stack. */ | |
455 | if (!ret && oldstack && | |
456 | (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) || | |
457 | __put_user(uoss.ss_flags, &oldstack->ss_flags) || | |
458 | __put_user(uoss.ss_size, &oldstack->ss_size))) | |
459 | return -EFAULT; | |
460 | return ret; | |
461 | } | |
462 | ||
463 | static int compat_restore_sigframe(struct pt_regs *regs, | |
464 | struct compat_sigframe __user *sf) | |
465 | { | |
466 | int err; | |
467 | sigset_t set; | |
468 | struct compat_aux_sigframe __user *aux; | |
469 | ||
470 | err = get_sigset_t(&set, &sf->uc.uc_sigmask); | |
471 | if (err == 0) { | |
472 | sigdelsetmask(&set, ~_BLOCKABLE); | |
473 | set_current_blocked(&set); | |
474 | } | |
475 | ||
476 | __get_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err); | |
477 | __get_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err); | |
478 | __get_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err); | |
479 | __get_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err); | |
480 | __get_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err); | |
481 | __get_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err); | |
482 | __get_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err); | |
483 | __get_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err); | |
484 | __get_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err); | |
485 | __get_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err); | |
486 | __get_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err); | |
487 | __get_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err); | |
488 | __get_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err); | |
489 | __get_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err); | |
490 | __get_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err); | |
491 | __get_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err); | |
492 | __get_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err); | |
493 | ||
494 | /* | |
495 | * Avoid compat_sys_sigreturn() restarting. | |
496 | */ | |
497 | regs->syscallno = ~0UL; | |
498 | ||
499 | err |= !valid_user_regs(®s->user_regs); | |
500 | ||
501 | aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace; | |
502 | if (err == 0) | |
503 | err |= compat_restore_vfp_context(&aux->vfp); | |
504 | ||
505 | return err; | |
506 | } | |
507 | ||
508 | asmlinkage int compat_sys_sigreturn(struct pt_regs *regs) | |
509 | { | |
510 | struct compat_sigframe __user *frame; | |
511 | ||
512 | /* Always make any pending restarted system calls return -EINTR */ | |
513 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
514 | ||
515 | /* | |
516 | * Since we stacked the signal on a 64-bit boundary, | |
517 | * then 'sp' should be word aligned here. If it's | |
518 | * not, then the user is trying to mess with us. | |
519 | */ | |
520 | if (regs->compat_sp & 7) | |
521 | goto badframe; | |
522 | ||
523 | frame = (struct compat_sigframe __user *)regs->compat_sp; | |
524 | ||
525 | if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) | |
526 | goto badframe; | |
527 | ||
528 | if (compat_restore_sigframe(regs, frame)) | |
529 | goto badframe; | |
530 | ||
531 | return regs->regs[0]; | |
532 | ||
533 | badframe: | |
534 | if (show_unhandled_signals) | |
535 | pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n", | |
536 | current->comm, task_pid_nr(current), __func__, | |
537 | regs->pc, regs->sp); | |
538 | force_sig(SIGSEGV, current); | |
539 | return 0; | |
540 | } | |
541 | ||
542 | asmlinkage int compat_sys_rt_sigreturn(struct pt_regs *regs) | |
543 | { | |
544 | struct compat_rt_sigframe __user *frame; | |
545 | ||
546 | /* Always make any pending restarted system calls return -EINTR */ | |
547 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
548 | ||
549 | /* | |
550 | * Since we stacked the signal on a 64-bit boundary, | |
551 | * then 'sp' should be word aligned here. If it's | |
552 | * not, then the user is trying to mess with us. | |
553 | */ | |
554 | if (regs->compat_sp & 7) | |
555 | goto badframe; | |
556 | ||
557 | frame = (struct compat_rt_sigframe __user *)regs->compat_sp; | |
558 | ||
559 | if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) | |
560 | goto badframe; | |
561 | ||
562 | if (compat_restore_sigframe(regs, &frame->sig)) | |
563 | goto badframe; | |
564 | ||
565 | if (compat_do_sigaltstack(ptr_to_compat(&frame->sig.uc.uc_stack), | |
566 | ptr_to_compat((void __user *)NULL), | |
567 | regs->compat_sp) == -EFAULT) | |
568 | goto badframe; | |
569 | ||
570 | return regs->regs[0]; | |
571 | ||
572 | badframe: | |
573 | if (show_unhandled_signals) | |
574 | pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n", | |
575 | current->comm, task_pid_nr(current), __func__, | |
576 | regs->pc, regs->sp); | |
577 | force_sig(SIGSEGV, current); | |
578 | return 0; | |
579 | } | |
580 | ||
581 | static inline void __user *compat_get_sigframe(struct k_sigaction *ka, | |
582 | struct pt_regs *regs, | |
583 | int framesize) | |
584 | { | |
585 | compat_ulong_t sp = regs->compat_sp; | |
586 | void __user *frame; | |
587 | ||
588 | /* | |
589 | * This is the X/Open sanctioned signal stack switching. | |
590 | */ | |
591 | if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp)) | |
592 | sp = current->sas_ss_sp + current->sas_ss_size; | |
593 | ||
594 | /* | |
595 | * ATPCS B01 mandates 8-byte alignment | |
596 | */ | |
597 | frame = compat_ptr((compat_uptr_t)((sp - framesize) & ~7)); | |
598 | ||
599 | /* | |
600 | * Check that we can actually write to the signal frame. | |
601 | */ | |
602 | if (!access_ok(VERIFY_WRITE, frame, framesize)) | |
603 | frame = NULL; | |
604 | ||
605 | return frame; | |
606 | } | |
607 | ||
608 | static int compat_setup_return(struct pt_regs *regs, struct k_sigaction *ka, | |
609 | compat_ulong_t __user *rc, void __user *frame, | |
610 | int usig) | |
611 | { | |
612 | compat_ulong_t handler = ptr_to_compat(ka->sa.sa_handler); | |
613 | compat_ulong_t retcode; | |
614 | compat_ulong_t spsr = regs->pstate & ~PSR_f; | |
615 | int thumb; | |
616 | ||
617 | /* Check if the handler is written for ARM or Thumb */ | |
618 | thumb = handler & 1; | |
619 | ||
620 | if (thumb) { | |
621 | spsr |= COMPAT_PSR_T_BIT; | |
622 | spsr &= ~COMPAT_PSR_IT_MASK; | |
623 | } else { | |
624 | spsr &= ~COMPAT_PSR_T_BIT; | |
625 | } | |
626 | ||
627 | if (ka->sa.sa_flags & SA_RESTORER) { | |
628 | retcode = ptr_to_compat(ka->sa.sa_restorer); | |
629 | } else { | |
630 | /* Set up sigreturn pointer */ | |
631 | unsigned int idx = thumb << 1; | |
632 | ||
633 | if (ka->sa.sa_flags & SA_SIGINFO) | |
634 | idx += 3; | |
635 | ||
636 | retcode = AARCH32_VECTORS_BASE + | |
637 | AARCH32_KERN_SIGRET_CODE_OFFSET + | |
638 | (idx << 2) + thumb; | |
639 | } | |
640 | ||
641 | regs->regs[0] = usig; | |
642 | regs->compat_sp = ptr_to_compat(frame); | |
643 | regs->compat_lr = retcode; | |
644 | regs->pc = handler; | |
645 | regs->pstate = spsr; | |
646 | ||
647 | return 0; | |
648 | } | |
649 | ||
650 | static int compat_setup_sigframe(struct compat_sigframe __user *sf, | |
651 | struct pt_regs *regs, sigset_t *set) | |
652 | { | |
653 | struct compat_aux_sigframe __user *aux; | |
654 | int err = 0; | |
655 | ||
656 | __put_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err); | |
657 | __put_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err); | |
658 | __put_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err); | |
659 | __put_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err); | |
660 | __put_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err); | |
661 | __put_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err); | |
662 | __put_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err); | |
663 | __put_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err); | |
664 | __put_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err); | |
665 | __put_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err); | |
666 | __put_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err); | |
667 | __put_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err); | |
668 | __put_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err); | |
669 | __put_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err); | |
670 | __put_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err); | |
671 | __put_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err); | |
672 | __put_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err); | |
673 | ||
674 | __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.trap_no, err); | |
675 | __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.error_code, err); | |
676 | __put_user_error(current->thread.fault_address, &sf->uc.uc_mcontext.fault_address, err); | |
677 | __put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err); | |
678 | ||
679 | err |= put_sigset_t(&sf->uc.uc_sigmask, set); | |
680 | ||
681 | aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace; | |
682 | ||
683 | if (err == 0) | |
684 | err |= compat_preserve_vfp_context(&aux->vfp); | |
685 | __put_user_error(0, &aux->end_magic, err); | |
686 | ||
687 | return err; | |
688 | } | |
689 | ||
690 | /* | |
691 | * 32-bit signal handling routines called from signal.c | |
692 | */ | |
693 | int compat_setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info, | |
694 | sigset_t *set, struct pt_regs *regs) | |
695 | { | |
696 | struct compat_rt_sigframe __user *frame; | |
697 | compat_stack_t stack; | |
698 | int err = 0; | |
699 | ||
700 | frame = compat_get_sigframe(ka, regs, sizeof(*frame)); | |
701 | ||
702 | if (!frame) | |
703 | return 1; | |
704 | ||
705 | err |= copy_siginfo_to_user32(&frame->info, info); | |
706 | ||
707 | __put_user_error(0, &frame->sig.uc.uc_flags, err); | |
708 | __put_user_error(NULL, &frame->sig.uc.uc_link, err); | |
709 | ||
710 | memset(&stack, 0, sizeof(stack)); | |
711 | stack.ss_sp = (compat_uptr_t)current->sas_ss_sp; | |
712 | stack.ss_flags = sas_ss_flags(regs->compat_sp); | |
713 | stack.ss_size = current->sas_ss_size; | |
714 | err |= __copy_to_user(&frame->sig.uc.uc_stack, &stack, sizeof(stack)); | |
715 | ||
716 | err |= compat_setup_sigframe(&frame->sig, regs, set); | |
717 | if (err == 0) | |
718 | err = compat_setup_return(regs, ka, frame->sig.retcode, frame, | |
719 | usig); | |
720 | ||
721 | if (err == 0) { | |
722 | regs->regs[1] = (compat_ulong_t)(unsigned long)&frame->info; | |
723 | regs->regs[2] = (compat_ulong_t)(unsigned long)&frame->sig.uc; | |
724 | } | |
725 | ||
726 | return err; | |
727 | } | |
728 | ||
729 | int compat_setup_frame(int usig, struct k_sigaction *ka, sigset_t *set, | |
730 | struct pt_regs *regs) | |
731 | { | |
732 | struct compat_sigframe __user *frame; | |
733 | int err = 0; | |
734 | ||
735 | frame = compat_get_sigframe(ka, regs, sizeof(*frame)); | |
736 | ||
737 | if (!frame) | |
738 | return 1; | |
739 | ||
740 | __put_user_error(0x5ac3c35a, &frame->uc.uc_flags, err); | |
741 | ||
742 | err |= compat_setup_sigframe(frame, regs, set); | |
743 | if (err == 0) | |
744 | err = compat_setup_return(regs, ka, frame->retcode, frame, usig); | |
745 | ||
746 | return err; | |
747 | } | |
748 | ||
749 | /* | |
750 | * RT signals don't have generic compat wrappers. | |
751 | * See arch/powerpc/kernel/signal_32.c | |
752 | */ | |
753 | asmlinkage int compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set, | |
754 | compat_sigset_t __user *oset, | |
755 | compat_size_t sigsetsize) | |
756 | { | |
757 | sigset_t s; | |
758 | sigset_t __user *up; | |
759 | int ret; | |
760 | mm_segment_t old_fs = get_fs(); | |
761 | ||
762 | if (set) { | |
763 | if (get_sigset_t(&s, set)) | |
764 | return -EFAULT; | |
765 | } | |
766 | ||
767 | set_fs(KERNEL_DS); | |
768 | /* This is valid because of the set_fs() */ | |
769 | up = (sigset_t __user *) &s; | |
770 | ret = sys_rt_sigprocmask(how, set ? up : NULL, oset ? up : NULL, | |
771 | sigsetsize); | |
772 | set_fs(old_fs); | |
773 | if (ret) | |
774 | return ret; | |
775 | if (oset) { | |
776 | if (put_sigset_t(oset, &s)) | |
777 | return -EFAULT; | |
778 | } | |
779 | return 0; | |
780 | } | |
781 | ||
782 | asmlinkage int compat_sys_rt_sigpending(compat_sigset_t __user *set, | |
783 | compat_size_t sigsetsize) | |
784 | { | |
785 | sigset_t s; | |
786 | int ret; | |
787 | mm_segment_t old_fs = get_fs(); | |
788 | ||
789 | set_fs(KERNEL_DS); | |
790 | /* The __user pointer cast is valid because of the set_fs() */ | |
791 | ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize); | |
792 | set_fs(old_fs); | |
793 | if (!ret) { | |
794 | if (put_sigset_t(set, &s)) | |
795 | return -EFAULT; | |
796 | } | |
797 | return ret; | |
798 | } | |
799 | ||
800 | asmlinkage int compat_sys_rt_sigqueueinfo(int pid, int sig, | |
801 | compat_siginfo_t __user *uinfo) | |
802 | { | |
803 | siginfo_t info; | |
804 | int ret; | |
805 | mm_segment_t old_fs = get_fs(); | |
806 | ||
807 | ret = copy_siginfo_from_user32(&info, uinfo); | |
808 | if (unlikely(ret)) | |
809 | return ret; | |
810 | ||
811 | set_fs (KERNEL_DS); | |
812 | /* The __user pointer cast is valid because of the set_fs() */ | |
813 | ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *) &info); | |
814 | set_fs (old_fs); | |
815 | return ret; | |
816 | } | |
817 | ||
818 | void compat_setup_restart_syscall(struct pt_regs *regs) | |
819 | { | |
4ed27ecf | 820 | regs->regs[7] = __NR_compat_restart_syscall; |
3dd681d9 | 821 | } |