]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - arch/arm64/kernel/signal32.c
projects / mirror_ubuntu-artful-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
arm64: Remove unused definitions from asm/unistd32.h
[mirror_ubuntu-artful-kernel.git] / arch / arm64 / kernel / signal32.c
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 struct compat_sigaction {
34 compat_uptr_t sa_handler;
35 compat_ulong_t sa_flags;
36 compat_uptr_t sa_restorer;
37 compat_sigset_t sa_mask;
38 };
39
40 struct compat_old_sigaction {
41 compat_uptr_t sa_handler;
42 compat_old_sigset_t sa_mask;
43 compat_ulong_t sa_flags;
44 compat_uptr_t sa_restorer;
45 };
46
47 typedef struct compat_sigaltstack {
48 compat_uptr_t ss_sp;
49 int ss_flags;
50 compat_size_t ss_size;
51 } compat_stack_t;
52
53 struct compat_sigcontext {
54 /* We always set these two fields to 0 */
55 compat_ulong_t trap_no;
56 compat_ulong_t error_code;
57
58 compat_ulong_t oldmask;
59 compat_ulong_t arm_r0;
60 compat_ulong_t arm_r1;
61 compat_ulong_t arm_r2;
62 compat_ulong_t arm_r3;
63 compat_ulong_t arm_r4;
64 compat_ulong_t arm_r5;
65 compat_ulong_t arm_r6;
66 compat_ulong_t arm_r7;
67 compat_ulong_t arm_r8;
68 compat_ulong_t arm_r9;
69 compat_ulong_t arm_r10;
70 compat_ulong_t arm_fp;
71 compat_ulong_t arm_ip;
72 compat_ulong_t arm_sp;
73 compat_ulong_t arm_lr;
74 compat_ulong_t arm_pc;
75 compat_ulong_t arm_cpsr;
76 compat_ulong_t fault_address;
77 };
78
79 struct compat_ucontext {
80 compat_ulong_t uc_flags;
81 struct compat_ucontext *uc_link;
82 compat_stack_t uc_stack;
83 struct compat_sigcontext uc_mcontext;
84 compat_sigset_t uc_sigmask;
85 int __unused[32 - (sizeof (compat_sigset_t) / sizeof (int))];
86 compat_ulong_t uc_regspace[128] __attribute__((__aligned__(8)));
87 };
88
89 struct compat_vfp_sigframe {
90 compat_ulong_t magic;
91 compat_ulong_t size;
92 struct compat_user_vfp {
93 compat_u64 fpregs[32];
94 compat_ulong_t fpscr;
95 } ufp;
96 struct compat_user_vfp_exc {
97 compat_ulong_t fpexc;
98 compat_ulong_t fpinst;
99 compat_ulong_t fpinst2;
100 } ufp_exc;
101 } __attribute__((__aligned__(8)));
102
103 #define VFP_MAGIC 0x56465001
104 #define VFP_STORAGE_SIZE sizeof(struct compat_vfp_sigframe)
105
106 struct compat_aux_sigframe {
107 struct compat_vfp_sigframe vfp;
108
109 /* Something that isn't a valid magic number for any coprocessor. */
110 unsigned long end_magic;
111 } __attribute__((__aligned__(8)));
112
113 struct compat_sigframe {
114 struct compat_ucontext uc;
115 compat_ulong_t retcode[2];
116 };
117
118 struct compat_rt_sigframe {
119 struct compat_siginfo info;
120 struct compat_sigframe sig;
121 };
122
123 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
124
125 /*
126 * For ARM syscalls, the syscall number has to be loaded into r7.
127 * We do not support an OABI userspace.
128 */
129 #define MOV_R7_NR_SIGRETURN (0xe3a07000 | __NR_compat_sigreturn)
130 #define SVC_SYS_SIGRETURN (0xef000000 | __NR_compat_sigreturn)
131 #define MOV_R7_NR_RT_SIGRETURN (0xe3a07000 | __NR_compat_rt_sigreturn)
132 #define SVC_SYS_RT_SIGRETURN (0xef000000 | __NR_compat_rt_sigreturn)
133
134 /*
135 * For Thumb syscalls, we also pass the syscall number via r7. We therefore
136 * need two 16-bit instructions.
137 */
138 #define SVC_THUMB_SIGRETURN (((0xdf00 | __NR_compat_sigreturn) << 16) | \
139 0x2700 | __NR_compat_sigreturn)
140 #define SVC_THUMB_RT_SIGRETURN (((0xdf00 | __NR_compat_rt_sigreturn) << 16) | \
141 0x2700 | __NR_compat_rt_sigreturn)
142
143 const compat_ulong_t aarch32_sigret_code[6] = {
144 /*
145 * AArch32 sigreturn code.
146 * We don't construct an OABI SWI - instead we just set the imm24 field
147 * to the EABI syscall number so that we create a sane disassembly.
148 */
149 MOV_R7_NR_SIGRETURN, SVC_SYS_SIGRETURN, SVC_THUMB_SIGRETURN,
150 MOV_R7_NR_RT_SIGRETURN, SVC_SYS_RT_SIGRETURN, SVC_THUMB_RT_SIGRETURN,
151 };
152
153 static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set)
154 {
155 compat_sigset_t cset;
156
157 cset.sig[0] = set->sig[0] & 0xffffffffull;
158 cset.sig[1] = set->sig[0] >> 32;
159
160 return copy_to_user(uset, &cset, sizeof(*uset));
161 }
162
163 static inline int get_sigset_t(sigset_t *set,
164 const compat_sigset_t __user *uset)
165 {
166 compat_sigset_t s32;
167
168 if (copy_from_user(&s32, uset, sizeof(*uset)))
169 return -EFAULT;
170
171 set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
172 return 0;
173 }
174
175 int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
176 {
177 int err;
178
179 if (!access_ok(VERIFY_WRITE, to, sizeof(*to)))
180 return -EFAULT;
181
182 /* If you change siginfo_t structure, please be sure
183 * this code is fixed accordingly.
184 * It should never copy any pad contained in the structure
185 * to avoid security leaks, but must copy the generic
186 * 3 ints plus the relevant union member.
187 * This routine must convert siginfo from 64bit to 32bit as well
188 * at the same time.
189 */
190 err = __put_user(from->si_signo, &to->si_signo);
191 err |= __put_user(from->si_errno, &to->si_errno);
192 err |= __put_user((short)from->si_code, &to->si_code);
193 if (from->si_code < 0)
194 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad,
195 SI_PAD_SIZE);
196 else switch (from->si_code & __SI_MASK) {
197 case __SI_KILL:
198 err |= __put_user(from->si_pid, &to->si_pid);
199 err |= __put_user(from->si_uid, &to->si_uid);
200 break;
201 case __SI_TIMER:
202 err |= __put_user(from->si_tid, &to->si_tid);
203 err |= __put_user(from->si_overrun, &to->si_overrun);
204 err |= __put_user((compat_uptr_t)(unsigned long)from->si_ptr,
205 &to->si_ptr);
206 break;
207 case __SI_POLL:
208 err |= __put_user(from->si_band, &to->si_band);
209 err |= __put_user(from->si_fd, &to->si_fd);
210 break;
211 case __SI_FAULT:
212 err |= __put_user((compat_uptr_t)(unsigned long)from->si_addr,
213 &to->si_addr);
214 #ifdef BUS_MCEERR_AO
215 /*
216 * Other callers might not initialize the si_lsb field,
217 * so check explicitely for the right codes here.
218 */
219 if (from->si_code == BUS_MCEERR_AR || from->si_code == BUS_MCEERR_AO)
220 err |= __put_user(from->si_addr_lsb, &to->si_addr_lsb);
221 #endif
222 break;
223 case __SI_CHLD:
224 err |= __put_user(from->si_pid, &to->si_pid);
225 err |= __put_user(from->si_uid, &to->si_uid);
226 err |= __put_user(from->si_status, &to->si_status);
227 err |= __put_user(from->si_utime, &to->si_utime);
228 err |= __put_user(from->si_stime, &to->si_stime);
229 break;
230 case __SI_RT: /* This is not generated by the kernel as of now. */
231 case __SI_MESGQ: /* But this is */
232 err |= __put_user(from->si_pid, &to->si_pid);
233 err |= __put_user(from->si_uid, &to->si_uid);
234 err |= __put_user((compat_uptr_t)(unsigned long)from->si_ptr, &to->si_ptr);
235 break;
236 default: /* this is just in case for now ... */
237 err |= __put_user(from->si_pid, &to->si_pid);
238 err |= __put_user(from->si_uid, &to->si_uid);
239 break;
240 }
241 return err;
242 }
243
244 int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
245 {
246 memset(to, 0, sizeof *to);
247
248 if (copy_from_user(to, from, __ARCH_SI_PREAMBLE_SIZE) ||
249 copy_from_user(to->_sifields._pad,
250 from->_sifields._pad, SI_PAD_SIZE))
251 return -EFAULT;
252
253 return 0;
254 }
255
256 /*
257 * VFP save/restore code.
258 */
259 static int compat_preserve_vfp_context(struct compat_vfp_sigframe __user *frame)
260 {
261 struct fpsimd_state *fpsimd = &current->thread.fpsimd_state;
262 compat_ulong_t magic = VFP_MAGIC;
263 compat_ulong_t size = VFP_STORAGE_SIZE;
264 compat_ulong_t fpscr, fpexc;
265 int err = 0;
266
267 /*
268 * Save the hardware registers to the fpsimd_state structure.
269 * Note that this also saves V16-31, which aren't visible
270 * in AArch32.
271 */
272 fpsimd_save_state(fpsimd);
273
274 /* Place structure header on the stack */
275 __put_user_error(magic, &frame->magic, err);
276 __put_user_error(size, &frame->size, err);
277
278 /*
279 * Now copy the FP registers. Since the registers are packed,
280 * we can copy the prefix we want (V0-V15) as it is.
281 * FIXME: Won't work if big endian.
282 */
283 err |= __copy_to_user(&frame->ufp.fpregs, fpsimd->vregs,
284 sizeof(frame->ufp.fpregs));
285
286 /* Create an AArch32 fpscr from the fpsr and the fpcr. */
287 fpscr = (fpsimd->fpsr & VFP_FPSCR_STAT_MASK) |
288 (fpsimd->fpcr & VFP_FPSCR_CTRL_MASK);
289 __put_user_error(fpscr, &frame->ufp.fpscr, err);
290
291 /*
292 * The exception register aren't available so we fake up a
293 * basic FPEXC and zero everything else.
294 */
295 fpexc = (1 << 30);
296 __put_user_error(fpexc, &frame->ufp_exc.fpexc, err);
297 __put_user_error(0, &frame->ufp_exc.fpinst, err);
298 __put_user_error(0, &frame->ufp_exc.fpinst2, err);
299
300 return err ? -EFAULT : 0;
301 }
302
303 static int compat_restore_vfp_context(struct compat_vfp_sigframe __user *frame)
304 {
305 struct fpsimd_state fpsimd;
306 compat_ulong_t magic = VFP_MAGIC;
307 compat_ulong_t size = VFP_STORAGE_SIZE;
308 compat_ulong_t fpscr;
309 int err = 0;
310
311 __get_user_error(magic, &frame->magic, err);
312 __get_user_error(size, &frame->size, err);
313
314 if (err)
315 return -EFAULT;
316 if (magic != VFP_MAGIC || size != VFP_STORAGE_SIZE)
317 return -EINVAL;
318
319 /*
320 * Copy the FP registers into the start of the fpsimd_state.
321 * FIXME: Won't work if big endian.
322 */
323 err |= __copy_from_user(fpsimd.vregs, frame->ufp.fpregs,
324 sizeof(frame->ufp.fpregs));
325
326 /* Extract the fpsr and the fpcr from the fpscr */
327 __get_user_error(fpscr, &frame->ufp.fpscr, err);
328 fpsimd.fpsr = fpscr & VFP_FPSCR_STAT_MASK;
329 fpsimd.fpcr = fpscr & VFP_FPSCR_CTRL_MASK;
330
331 /*
332 * We don't need to touch the exception register, so
333 * reload the hardware state.
334 */
335 if (!err) {
336 preempt_disable();
337 fpsimd_load_state(&fpsimd);
338 preempt_enable();
339 }
340
341 return err ? -EFAULT : 0;
342 }
343
344 /*
345 * atomically swap in the new signal mask, and wait for a signal.
346 */
347 asmlinkage int compat_sys_sigsuspend(int restart, compat_ulong_t oldmask,
348 compat_old_sigset_t mask)
349 {
350 sigset_t blocked;
351
352 siginitset(&current->blocked, mask);
353 return sigsuspend(&blocked);
354 }
355
356 asmlinkage int compat_sys_sigaction(int sig,
357 const struct compat_old_sigaction __user *act,
358 struct compat_old_sigaction __user *oact)
359 {
360 struct k_sigaction new_ka, old_ka;
361 int ret;
362 compat_old_sigset_t mask;
363 compat_uptr_t handler, restorer;
364
365 if (act) {
366 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
367 __get_user(handler, &act->sa_handler) ||
368 __get_user(restorer, &act->sa_restorer) ||
369 __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
370 __get_user(mask, &act->sa_mask))
371 return -EFAULT;
372
373 new_ka.sa.sa_handler = compat_ptr(handler);
374 new_ka.sa.sa_restorer = compat_ptr(restorer);
375 siginitset(&new_ka.sa.sa_mask, mask);
376 }
377
378 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
379
380 if (!ret && oact) {
381 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
382 __put_user(ptr_to_compat(old_ka.sa.sa_handler),
383 &oact->sa_handler) ||
384 __put_user(ptr_to_compat(old_ka.sa.sa_restorer),
385 &oact->sa_restorer) ||
386 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
387 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
388 return -EFAULT;
389 }
390
391 return ret;
392 }
393
394 asmlinkage int compat_sys_rt_sigaction(int sig,
395 const struct compat_sigaction __user *act,
396 struct compat_sigaction __user *oact,
397 compat_size_t sigsetsize)
398 {
399 struct k_sigaction new_ka, old_ka;
400 int ret;
401
402 /* XXX: Don't preclude handling different sized sigset_t's. */
403 if (sigsetsize != sizeof(compat_sigset_t))
404 return -EINVAL;
405
406 if (act) {
407 compat_uptr_t handler, restorer;
408
409 ret = get_user(handler, &act->sa_handler);
410 new_ka.sa.sa_handler = compat_ptr(handler);
411 ret |= get_user(restorer, &act->sa_restorer);
412 new_ka.sa.sa_restorer = compat_ptr(restorer);
413 ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask);
414 ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
415 if (ret)
416 return -EFAULT;
417 }
418
419 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
420 if (!ret && oact) {
421 ret = put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler);
422 ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask);
423 ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
424 }
425 return ret;
426 }
427
428 int compat_do_sigaltstack(compat_uptr_t compat_uss, compat_uptr_t compat_uoss,
429 compat_ulong_t sp)
430 {
431 compat_stack_t __user *newstack = compat_ptr(compat_uss);
432 compat_stack_t __user *oldstack = compat_ptr(compat_uoss);
433 compat_uptr_t ss_sp;
434 int ret;
435 mm_segment_t old_fs;
436 stack_t uss, uoss;
437
438 /* Marshall the compat new stack into a stack_t */
439 if (newstack) {
440 if (get_user(ss_sp, &newstack->ss_sp) ||
441 __get_user(uss.ss_flags, &newstack->ss_flags) ||
442 __get_user(uss.ss_size, &newstack->ss_size))
443 return -EFAULT;
444 uss.ss_sp = compat_ptr(ss_sp);
445 }
446
447 old_fs = get_fs();
448 set_fs(KERNEL_DS);
449 /* The __user pointer casts are valid because of the set_fs() */
450 ret = do_sigaltstack(
451 newstack ? (stack_t __user *) &uss : NULL,
452 oldstack ? (stack_t __user *) &uoss : NULL,
453 (unsigned long)sp);
454 set_fs(old_fs);
455
456 /* Convert the old stack_t into a compat stack. */
457 if (!ret && oldstack &&
458 (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) ||
459 __put_user(uoss.ss_flags, &oldstack->ss_flags) ||
460 __put_user(uoss.ss_size, &oldstack->ss_size)))
461 return -EFAULT;
462 return ret;
463 }
464
465 static int compat_restore_sigframe(struct pt_regs *regs,
466 struct compat_sigframe __user *sf)
467 {
468 int err;
469 sigset_t set;
470 struct compat_aux_sigframe __user *aux;
471
472 err = get_sigset_t(&set, &sf->uc.uc_sigmask);
473 if (err == 0) {
474 sigdelsetmask(&set, ~_BLOCKABLE);
475 set_current_blocked(&set);
476 }
477
478 __get_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err);
479 __get_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err);
480 __get_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err);
481 __get_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err);
482 __get_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err);
483 __get_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err);
484 __get_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err);
485 __get_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err);
486 __get_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err);
487 __get_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err);
488 __get_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err);
489 __get_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err);
490 __get_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err);
491 __get_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err);
492 __get_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err);
493 __get_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err);
494 __get_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err);
495
496 /*
497 * Avoid compat_sys_sigreturn() restarting.
498 */
499 regs->syscallno = ~0UL;
500
501 err |= !valid_user_regs(&regs->user_regs);
502
503 aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace;
504 if (err == 0)
505 err |= compat_restore_vfp_context(&aux->vfp);
506
507 return err;
508 }
509
510 asmlinkage int compat_sys_sigreturn(struct pt_regs *regs)
511 {
512 struct compat_sigframe __user *frame;
513
514 /* Always make any pending restarted system calls return -EINTR */
515 current_thread_info()->restart_block.fn = do_no_restart_syscall;
516
517 /*
518 * Since we stacked the signal on a 64-bit boundary,
519 * then 'sp' should be word aligned here. If it's
520 * not, then the user is trying to mess with us.
521 */
522 if (regs->compat_sp & 7)
523 goto badframe;
524
525 frame = (struct compat_sigframe __user *)regs->compat_sp;
526
527 if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
528 goto badframe;
529
530 if (compat_restore_sigframe(regs, frame))
531 goto badframe;
532
533 return regs->regs[0];
534
535 badframe:
536 if (show_unhandled_signals)
537 pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
538 current->comm, task_pid_nr(current), __func__,
539 regs->pc, regs->sp);
540 force_sig(SIGSEGV, current);
541 return 0;
542 }
543
544 asmlinkage int compat_sys_rt_sigreturn(struct pt_regs *regs)
545 {
546 struct compat_rt_sigframe __user *frame;
547
548 /* Always make any pending restarted system calls return -EINTR */
549 current_thread_info()->restart_block.fn = do_no_restart_syscall;
550
551 /*
552 * Since we stacked the signal on a 64-bit boundary,
553 * then 'sp' should be word aligned here. If it's
554 * not, then the user is trying to mess with us.
555 */
556 if (regs->compat_sp & 7)
557 goto badframe;
558
559 frame = (struct compat_rt_sigframe __user *)regs->compat_sp;
560
561 if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
562 goto badframe;
563
564 if (compat_restore_sigframe(regs, &frame->sig))
565 goto badframe;
566
567 if (compat_do_sigaltstack(ptr_to_compat(&frame->sig.uc.uc_stack),
568 ptr_to_compat((void __user *)NULL),
569 regs->compat_sp) == -EFAULT)
570 goto badframe;
571
572 return regs->regs[0];
573
574 badframe:
575 if (show_unhandled_signals)
576 pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
577 current->comm, task_pid_nr(current), __func__,
578 regs->pc, regs->sp);
579 force_sig(SIGSEGV, current);
580 return 0;
581 }
582
583 static inline void __user *compat_get_sigframe(struct k_sigaction *ka,
584 struct pt_regs *regs,
585 int framesize)
586 {
587 compat_ulong_t sp = regs->compat_sp;
588 void __user *frame;
589
590 /*
591 * This is the X/Open sanctioned signal stack switching.
592 */
593 if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
594 sp = current->sas_ss_sp + current->sas_ss_size;
595
596 /*
597 * ATPCS B01 mandates 8-byte alignment
598 */
599 frame = compat_ptr((compat_uptr_t)((sp - framesize) & ~7));
600
601 /*
602 * Check that we can actually write to the signal frame.
603 */
604 if (!access_ok(VERIFY_WRITE, frame, framesize))
605 frame = NULL;
606
607 return frame;
608 }
609
610 static int compat_setup_return(struct pt_regs *regs, struct k_sigaction *ka,
611 compat_ulong_t __user *rc, void __user *frame,
612 int usig)
613 {
614 compat_ulong_t handler = ptr_to_compat(ka->sa.sa_handler);
615 compat_ulong_t retcode;
616 compat_ulong_t spsr = regs->pstate & ~PSR_f;
617 int thumb;
618
619 /* Check if the handler is written for ARM or Thumb */
620 thumb = handler & 1;
621
622 if (thumb) {
623 spsr |= COMPAT_PSR_T_BIT;
624 spsr &= ~COMPAT_PSR_IT_MASK;
625 } else {
626 spsr &= ~COMPAT_PSR_T_BIT;
627 }
628
629 if (ka->sa.sa_flags & SA_RESTORER) {
630 retcode = ptr_to_compat(ka->sa.sa_restorer);
631 } else {
632 /* Set up sigreturn pointer */
633 unsigned int idx = thumb << 1;
634
635 if (ka->sa.sa_flags & SA_SIGINFO)
636 idx += 3;
637
638 retcode = AARCH32_VECTORS_BASE +
639 AARCH32_KERN_SIGRET_CODE_OFFSET +
640 (idx << 2) + thumb;
641 }
642
643 regs->regs[0] = usig;
644 regs->compat_sp = ptr_to_compat(frame);
645 regs->compat_lr = retcode;
646 regs->pc = handler;
647 regs->pstate = spsr;
648
649 return 0;
650 }
651
652 static int compat_setup_sigframe(struct compat_sigframe __user *sf,
653 struct pt_regs *regs, sigset_t *set)
654 {
655 struct compat_aux_sigframe __user *aux;
656 int err = 0;
657
658 __put_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err);
659 __put_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err);
660 __put_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err);
661 __put_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err);
662 __put_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err);
663 __put_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err);
664 __put_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err);
665 __put_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err);
666 __put_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err);
667 __put_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err);
668 __put_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err);
669 __put_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err);
670 __put_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err);
671 __put_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err);
672 __put_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err);
673 __put_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err);
674 __put_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err);
675
676 __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.trap_no, err);
677 __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.error_code, err);
678 __put_user_error(current->thread.fault_address, &sf->uc.uc_mcontext.fault_address, err);
679 __put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err);
680
681 err |= put_sigset_t(&sf->uc.uc_sigmask, set);
682
683 aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace;
684
685 if (err == 0)
686 err |= compat_preserve_vfp_context(&aux->vfp);
687 __put_user_error(0, &aux->end_magic, err);
688
689 return err;
690 }
691
692 /*
693 * 32-bit signal handling routines called from signal.c
694 */
695 int compat_setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
696 sigset_t *set, struct pt_regs *regs)
697 {
698 struct compat_rt_sigframe __user *frame;
699 compat_stack_t stack;
700 int err = 0;
701
702 frame = compat_get_sigframe(ka, regs, sizeof(*frame));
703
704 if (!frame)
705 return 1;
706
707 err |= copy_siginfo_to_user32(&frame->info, info);
708
709 __put_user_error(0, &frame->sig.uc.uc_flags, err);
710 __put_user_error(NULL, &frame->sig.uc.uc_link, err);
711
712 memset(&stack, 0, sizeof(stack));
713 stack.ss_sp = (compat_uptr_t)current->sas_ss_sp;
714 stack.ss_flags = sas_ss_flags(regs->compat_sp);
715 stack.ss_size = current->sas_ss_size;
716 err |= __copy_to_user(&frame->sig.uc.uc_stack, &stack, sizeof(stack));
717
718 err |= compat_setup_sigframe(&frame->sig, regs, set);
719 if (err == 0)
720 err = compat_setup_return(regs, ka, frame->sig.retcode, frame,
721 usig);
722
723 if (err == 0) {
724 regs->regs[1] = (compat_ulong_t)(unsigned long)&frame->info;
725 regs->regs[2] = (compat_ulong_t)(unsigned long)&frame->sig.uc;
726 }
727
728 return err;
729 }
730
731 int compat_setup_frame(int usig, struct k_sigaction *ka, sigset_t *set,
732 struct pt_regs *regs)
733 {
734 struct compat_sigframe __user *frame;
735 int err = 0;
736
737 frame = compat_get_sigframe(ka, regs, sizeof(*frame));
738
739 if (!frame)
740 return 1;
741
742 __put_user_error(0x5ac3c35a, &frame->uc.uc_flags, err);
743
744 err |= compat_setup_sigframe(frame, regs, set);
745 if (err == 0)
746 err = compat_setup_return(regs, ka, frame->retcode, frame, usig);
747
748 return err;
749 }
750
751 /*
752 * RT signals don't have generic compat wrappers.
753 * See arch/powerpc/kernel/signal_32.c
754 */
755 asmlinkage int compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
756 compat_sigset_t __user *oset,
757 compat_size_t sigsetsize)
758 {
759 sigset_t s;
760 sigset_t __user *up;
761 int ret;
762 mm_segment_t old_fs = get_fs();
763
764 if (set) {
765 if (get_sigset_t(&s, set))
766 return -EFAULT;
767 }
768
769 set_fs(KERNEL_DS);
770 /* This is valid because of the set_fs() */
771 up = (sigset_t __user *) &s;
772 ret = sys_rt_sigprocmask(how, set ? up : NULL, oset ? up : NULL,
773 sigsetsize);
774 set_fs(old_fs);
775 if (ret)
776 return ret;
777 if (oset) {
778 if (put_sigset_t(oset, &s))
779 return -EFAULT;
780 }
781 return 0;
782 }
783
784 asmlinkage int compat_sys_rt_sigpending(compat_sigset_t __user *set,
785 compat_size_t sigsetsize)
786 {
787 sigset_t s;
788 int ret;
789 mm_segment_t old_fs = get_fs();
790
791 set_fs(KERNEL_DS);
792 /* The __user pointer cast is valid because of the set_fs() */
793 ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize);
794 set_fs(old_fs);
795 if (!ret) {
796 if (put_sigset_t(set, &s))
797 return -EFAULT;
798 }
799 return ret;
800 }
801
802 asmlinkage int compat_sys_rt_sigqueueinfo(int pid, int sig,
803 compat_siginfo_t __user *uinfo)
804 {
805 siginfo_t info;
806 int ret;
807 mm_segment_t old_fs = get_fs();
808
809 ret = copy_siginfo_from_user32(&info, uinfo);
810 if (unlikely(ret))
811 return ret;
812
813 set_fs (KERNEL_DS);
814 /* The __user pointer cast is valid because of the set_fs() */
815 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *) &info);
816 set_fs (old_fs);
817 return ret;
818 }
819
820 void compat_setup_restart_syscall(struct pt_regs *regs)
821 {
822 regs->regs[7] = __NR_compat_restart_syscall;
823 }
Ubuntu Artful kernel mirror