1
2
3
4
5
6
7
8
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/sched.h>
13#include <linux/sched/task_stack.h>
14#include <linux/mm.h>
15#include <linux/smp.h>
16#include <linux/kernel.h>
17#include <linux/errno.h>
18#include <linux/wait.h>
19#include <linux/tracehook.h>
20#include <linux/unistd.h>
21#include <linux/stddef.h>
22#include <linux/personality.h>
23#include <linux/uaccess.h>
24#include <linux/user-return-notifier.h>
25#include <linux/uprobes.h>
26#include <linux/context_tracking.h>
27
28#include <asm/processor.h>
29#include <asm/ucontext.h>
30#include <asm/fpu/internal.h>
31#include <asm/fpu/signal.h>
32#include <asm/vdso.h>
33#include <asm/mce.h>
34#include <asm/sighandling.h>
35#include <asm/vm86.h>
36
37#ifdef CONFIG_X86_64
38#include <asm/proto.h>
39#include <asm/ia32_unistd.h>
40#endif
41
42#include <asm/syscall.h>
43#include <asm/syscalls.h>
44
45#include <asm/sigframe.h>
46#include <asm/signal.h>
47
48#define COPY(x) do { \
49 get_user_ex(regs->x, &sc->x); \
50} while (0)
51
52#define GET_SEG(seg) ({ \
53 unsigned short tmp; \
54 get_user_ex(tmp, &sc->seg); \
55 tmp; \
56})
57
58#define COPY_SEG(seg) do { \
59 regs->seg = GET_SEG(seg); \
60} while (0)
61
62#define COPY_SEG_CPL3(seg) do { \
63 regs->seg = GET_SEG(seg) | 3; \
64} while (0)
65
66#ifdef CONFIG_X86_64
67
68
69
70
71
72static void force_valid_ss(struct pt_regs *regs)
73{
74 u32 ar;
75 asm volatile ("lar %[old_ss], %[ar]\n\t"
76 "jz 1f\n\t"
77 "xorl %[ar], %[ar]\n\t"
78 "1:"
79 : [ar] "=r" (ar)
80 : [old_ss] "rm" ((u16)regs->ss));
81
82
83
84
85
86
87
88 ar &= AR_DPL_MASK | AR_S | AR_P | AR_TYPE_MASK;
89 if (ar != (AR_DPL3 | AR_S | AR_P | AR_TYPE_RWDATA) &&
90 ar != (AR_DPL3 | AR_S | AR_P | AR_TYPE_RWDATA_EXPDOWN))
91 regs->ss = __USER_DS;
92}
93#endif
94
95static int restore_sigcontext(struct pt_regs *regs,
96 struct sigcontext __user *sc,
97 unsigned long uc_flags)
98{
99 unsigned long buf_val;
100 void __user *buf;
101 unsigned int tmpflags;
102 unsigned int err = 0;
103
104
105 current->restart_block.fn = do_no_restart_syscall;
106
107 get_user_try {
108
109#ifdef CONFIG_X86_32
110 set_user_gs(regs, GET_SEG(gs));
111 COPY_SEG(fs);
112 COPY_SEG(es);
113 COPY_SEG(ds);
114#endif
115
116 COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
117 COPY(dx); COPY(cx); COPY(ip); COPY(ax);
118
119#ifdef CONFIG_X86_64
120 COPY(r8);
121 COPY(r9);
122 COPY(r10);
123 COPY(r11);
124 COPY(r12);
125 COPY(r13);
126 COPY(r14);
127 COPY(r15);
128#endif
129
130 COPY_SEG_CPL3(cs);
131 COPY_SEG_CPL3(ss);
132
133#ifdef CONFIG_X86_64
134
135
136
137
138 if (unlikely(!(uc_flags & UC_STRICT_RESTORE_SS) &&
139 user_64bit_mode(regs)))
140 force_valid_ss(regs);
141#endif
142
143 get_user_ex(tmpflags, &sc->flags);
144 regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
145 regs->orig_ax = -1;
146
147 get_user_ex(buf_val, &sc->fpstate);
148 buf = (void __user *)buf_val;
149 } get_user_catch(err);
150
151 err |= fpu__restore_sig(buf, IS_ENABLED(CONFIG_X86_32));
152
153 force_iret();
154
155 return err;
156}
157
158int setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate,
159 struct pt_regs *regs, unsigned long mask)
160{
161 int err = 0;
162
163 put_user_try {
164
165#ifdef CONFIG_X86_32
166 put_user_ex(get_user_gs(regs), (unsigned int __user *)&sc->gs);
167 put_user_ex(regs->fs, (unsigned int __user *)&sc->fs);
168 put_user_ex(regs->es, (unsigned int __user *)&sc->es);
169 put_user_ex(regs->ds, (unsigned int __user *)&sc->ds);
170#endif
171
172 put_user_ex(regs->di, &sc->di);
173 put_user_ex(regs->si, &sc->si);
174 put_user_ex(regs->bp, &sc->bp);
175 put_user_ex(regs->sp, &sc->sp);
176 put_user_ex(regs->bx, &sc->bx);
177 put_user_ex(regs->dx, &sc->dx);
178 put_user_ex(regs->cx, &sc->cx);
179 put_user_ex(regs->ax, &sc->ax);
180#ifdef CONFIG_X86_64
181 put_user_ex(regs->r8, &sc->r8);
182 put_user_ex(regs->r9, &sc->r9);
183 put_user_ex(regs->r10, &sc->r10);
184 put_user_ex(regs->r11, &sc->r11);
185 put_user_ex(regs->r12, &sc->r12);
186 put_user_ex(regs->r13, &sc->r13);
187 put_user_ex(regs->r14, &sc->r14);
188 put_user_ex(regs->r15, &sc->r15);
189#endif
190
191 put_user_ex(current->thread.trap_nr, &sc->trapno);
192 put_user_ex(current->thread.error_code, &sc->err);
193 put_user_ex(regs->ip, &sc->ip);
194#ifdef CONFIG_X86_32
195 put_user_ex(regs->cs, (unsigned int __user *)&sc->cs);
196 put_user_ex(regs->flags, &sc->flags);
197 put_user_ex(regs->sp, &sc->sp_at_signal);
198 put_user_ex(regs->ss, (unsigned int __user *)&sc->ss);
199#else
200 put_user_ex(regs->flags, &sc->flags);
201 put_user_ex(regs->cs, &sc->cs);
202 put_user_ex(0, &sc->gs);
203 put_user_ex(0, &sc->fs);
204 put_user_ex(regs->ss, &sc->ss);
205#endif
206
207 put_user_ex(fpstate, &sc->fpstate);
208
209
210 put_user_ex(mask, &sc->oldmask);
211 put_user_ex(current->thread.cr2, &sc->cr2);
212 } put_user_catch(err);
213
214 return err;
215}
216
217
218
219
220
221
222
223
224static unsigned long align_sigframe(unsigned long sp)
225{
226#ifdef CONFIG_X86_32
227
228
229
230
231 sp = ((sp + 4) & -16ul) - 4;
232#else
233 sp = round_down(sp, 16) - 8;
234#endif
235 return sp;
236}
237
238static void __user *
239get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
240 void __user **fpstate)
241{
242
243 unsigned long math_size = 0;
244 unsigned long sp = regs->sp;
245 unsigned long buf_fx = 0;
246 int onsigstack = on_sig_stack(sp);
247 struct fpu *fpu = ¤t->thread.fpu;
248
249
250 if (IS_ENABLED(CONFIG_X86_64))
251 sp -= 128;
252
253
254 if (ka->sa.sa_flags & SA_ONSTACK) {
255 if (sas_ss_flags(sp) == 0)
256 sp = current->sas_ss_sp + current->sas_ss_size;
257 } else if (IS_ENABLED(CONFIG_X86_32) &&
258 !onsigstack &&
259 (regs->ss & 0xffff) != __USER_DS &&
260 !(ka->sa.sa_flags & SA_RESTORER) &&
261 ka->sa.sa_restorer) {
262
263 sp = (unsigned long) ka->sa.sa_restorer;
264 }
265
266 if (fpu->fpstate_active) {
267 sp = fpu__alloc_mathframe(sp, IS_ENABLED(CONFIG_X86_32),
268 &buf_fx, &math_size);
269 *fpstate = (void __user *)sp;
270 }
271
272 sp = align_sigframe(sp - frame_size);
273
274
275
276
277
278 if (onsigstack && !likely(on_sig_stack(sp)))
279 return (void __user *)-1L;
280
281
282 if (fpu->fpstate_active &&
283 copy_fpstate_to_sigframe(*fpstate, (void __user *)buf_fx, math_size) < 0)
284 return (void __user *)-1L;
285
286 return (void __user *)sp;
287}
288
289#ifdef CONFIG_X86_32
290static const struct {
291 u16 poplmovl;
292 u32 val;
293 u16 int80;
294} __attribute__((packed)) retcode = {
295 0xb858,
296 __NR_sigreturn,
297 0x80cd,
298};
299
300static const struct {
301 u8 movl;
302 u32 val;
303 u16 int80;
304 u8 pad;
305} __attribute__((packed)) rt_retcode = {
306 0xb8,
307 __NR_rt_sigreturn,
308 0x80cd,
309 0
310};
311
312static int
313__setup_frame(int sig, struct ksignal *ksig, sigset_t *set,
314 struct pt_regs *regs)
315{
316 struct sigframe __user *frame;
317 void __user *restorer;
318 int err = 0;
319 void __user *fpstate = NULL;
320
321 frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fpstate);
322
323 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
324 return -EFAULT;
325
326 if (__put_user(sig, &frame->sig))
327 return -EFAULT;
328
329 if (setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]))
330 return -EFAULT;
331
332 if (_NSIG_WORDS > 1) {
333 if (__copy_to_user(&frame->extramask, &set->sig[1],
334 sizeof(frame->extramask)))
335 return -EFAULT;
336 }
337
338 if (current->mm->context.vdso)
339 restorer = current->mm->context.vdso +
340 vdso_image_32.sym___kernel_sigreturn;
341 else
342 restorer = &frame->retcode;
343 if (ksig->ka.sa.sa_flags & SA_RESTORER)
344 restorer = ksig->ka.sa.sa_restorer;
345
346
347 err |= __put_user(restorer, &frame->pretcode);
348
349
350
351
352
353
354
355
356 err |= __put_user(*((u64 *)&retcode), (u64 *)frame->retcode);
357
358 if (err)
359 return -EFAULT;
360
361
362 regs->sp = (unsigned long)frame;
363 regs->ip = (unsigned long)ksig->ka.sa.sa_handler;
364 regs->ax = (unsigned long)sig;
365 regs->dx = 0;
366 regs->cx = 0;
367
368 regs->ds = __USER_DS;
369 regs->es = __USER_DS;
370 regs->ss = __USER_DS;
371 regs->cs = __USER_CS;
372
373 return 0;
374}
375
376static int __setup_rt_frame(int sig, struct ksignal *ksig,
377 sigset_t *set, struct pt_regs *regs)
378{
379 struct rt_sigframe __user *frame;
380 void __user *restorer;
381 int err = 0;
382 void __user *fpstate = NULL;
383
384 frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fpstate);
385
386 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
387 return -EFAULT;
388
389 put_user_try {
390 put_user_ex(sig, &frame->sig);
391 put_user_ex(&frame->info, &frame->pinfo);
392 put_user_ex(&frame->uc, &frame->puc);
393
394
395 if (boot_cpu_has(X86_FEATURE_XSAVE))
396 put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
397 else
398 put_user_ex(0, &frame->uc.uc_flags);
399 put_user_ex(0, &frame->uc.uc_link);
400 save_altstack_ex(&frame->uc.uc_stack, regs->sp);
401
402
403 restorer = current->mm->context.vdso +
404 vdso_image_32.sym___kernel_rt_sigreturn;
405 if (ksig->ka.sa.sa_flags & SA_RESTORER)
406 restorer = ksig->ka.sa.sa_restorer;
407 put_user_ex(restorer, &frame->pretcode);
408
409
410
411
412
413
414
415
416 put_user_ex(*((u64 *)&rt_retcode), (u64 *)frame->retcode);
417 } put_user_catch(err);
418
419 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
420 err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
421 regs, set->sig[0]);
422 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
423
424 if (err)
425 return -EFAULT;
426
427
428 regs->sp = (unsigned long)frame;
429 regs->ip = (unsigned long)ksig->ka.sa.sa_handler;
430 regs->ax = (unsigned long)sig;
431 regs->dx = (unsigned long)&frame->info;
432 regs->cx = (unsigned long)&frame->uc;
433
434 regs->ds = __USER_DS;
435 regs->es = __USER_DS;
436 regs->ss = __USER_DS;
437 regs->cs = __USER_CS;
438
439 return 0;
440}
441#else
442static unsigned long frame_uc_flags(struct pt_regs *regs)
443{
444 unsigned long flags;
445
446 if (boot_cpu_has(X86_FEATURE_XSAVE))
447 flags = UC_FP_XSTATE | UC_SIGCONTEXT_SS;
448 else
449 flags = UC_SIGCONTEXT_SS;
450
451 if (likely(user_64bit_mode(regs)))
452 flags |= UC_STRICT_RESTORE_SS;
453
454 return flags;
455}
456
457static int __setup_rt_frame(int sig, struct ksignal *ksig,
458 sigset_t *set, struct pt_regs *regs)
459{
460 struct rt_sigframe __user *frame;
461 void __user *fp = NULL;
462 int err = 0;
463
464 frame = get_sigframe(&ksig->ka, regs, sizeof(struct rt_sigframe), &fp);
465
466 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
467 return -EFAULT;
468
469 if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
470 if (copy_siginfo_to_user(&frame->info, &ksig->info))
471 return -EFAULT;
472 }
473
474 put_user_try {
475
476 put_user_ex(frame_uc_flags(regs), &frame->uc.uc_flags);
477 put_user_ex(0, &frame->uc.uc_link);
478 save_altstack_ex(&frame->uc.uc_stack, regs->sp);
479
480
481
482
483 if (ksig->ka.sa.sa_flags & SA_RESTORER) {
484 put_user_ex(ksig->ka.sa.sa_restorer, &frame->pretcode);
485 } else {
486
487 err |= -EFAULT;
488 }
489 } put_user_catch(err);
490
491 err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]);
492 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
493
494 if (err)
495 return -EFAULT;
496
497
498 regs->di = sig;
499
500 regs->ax = 0;
501
502
503
504 regs->si = (unsigned long)&frame->info;
505 regs->dx = (unsigned long)&frame->uc;
506 regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
507
508 regs->sp = (unsigned long)frame;
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527 regs->cs = __USER_CS;
528
529 if (unlikely(regs->ss != __USER_DS))
530 force_valid_ss(regs);
531
532 return 0;
533}
534#endif
535
536static int x32_setup_rt_frame(struct ksignal *ksig,
537 compat_sigset_t *set,
538 struct pt_regs *regs)
539{
540#ifdef CONFIG_X86_X32_ABI
541 struct rt_sigframe_x32 __user *frame;
542 void __user *restorer;
543 int err = 0;
544 void __user *fpstate = NULL;
545
546 frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fpstate);
547
548 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
549 return -EFAULT;
550
551 if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
552 if (__copy_siginfo_to_user32(&frame->info, &ksig->info, true))
553 return -EFAULT;
554 }
555
556 put_user_try {
557
558 put_user_ex(frame_uc_flags(regs), &frame->uc.uc_flags);
559 put_user_ex(0, &frame->uc.uc_link);
560 compat_save_altstack_ex(&frame->uc.uc_stack, regs->sp);
561 put_user_ex(0, &frame->uc.uc__pad0);
562
563 if (ksig->ka.sa.sa_flags & SA_RESTORER) {
564 restorer = ksig->ka.sa.sa_restorer;
565 } else {
566
567 restorer = NULL;
568 err |= -EFAULT;
569 }
570 put_user_ex(restorer, &frame->pretcode);
571 } put_user_catch(err);
572
573 err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
574 regs, set->sig[0]);
575 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
576
577 if (err)
578 return -EFAULT;
579
580
581 regs->sp = (unsigned long) frame;
582 regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
583
584
585 regs->di = ksig->sig;
586 regs->si = (unsigned long) &frame->info;
587 regs->dx = (unsigned long) &frame->uc;
588
589 loadsegment(ds, __USER_DS);
590 loadsegment(es, __USER_DS);
591
592 regs->cs = __USER_CS;
593 regs->ss = __USER_DS;
594#endif
595
596 return 0;
597}
598
599
600
601
602#ifdef CONFIG_X86_32
603asmlinkage unsigned long sys_sigreturn(void)
604{
605 struct pt_regs *regs = current_pt_regs();
606 struct sigframe __user *frame;
607 sigset_t set;
608
609 frame = (struct sigframe __user *)(regs->sp - 8);
610
611 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
612 goto badframe;
613 if (__get_user(set.sig[0], &frame->sc.oldmask) || (_NSIG_WORDS > 1
614 && __copy_from_user(&set.sig[1], &frame->extramask,
615 sizeof(frame->extramask))))
616 goto badframe;
617
618 set_current_blocked(&set);
619
620
621
622
623
624 if (restore_sigcontext(regs, &frame->sc, 0))
625 goto badframe;
626 return regs->ax;
627
628badframe:
629 signal_fault(regs, frame, "sigreturn");
630
631 return 0;
632}
633#endif
634
635asmlinkage long sys_rt_sigreturn(void)
636{
637 struct pt_regs *regs = current_pt_regs();
638 struct rt_sigframe __user *frame;
639 sigset_t set;
640 unsigned long uc_flags;
641
642 frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long));
643 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
644 goto badframe;
645 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
646 goto badframe;
647 if (__get_user(uc_flags, &frame->uc.uc_flags))
648 goto badframe;
649
650 set_current_blocked(&set);
651
652 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, uc_flags))
653 goto badframe;
654
655 if (restore_altstack(&frame->uc.uc_stack))
656 goto badframe;
657
658 return regs->ax;
659
660badframe:
661 signal_fault(regs, frame, "rt_sigreturn");
662 return 0;
663}
664
665static inline int is_ia32_compat_frame(struct ksignal *ksig)
666{
667 return IS_ENABLED(CONFIG_IA32_EMULATION) &&
668 ksig->ka.sa.sa_flags & SA_IA32_ABI;
669}
670
671static inline int is_ia32_frame(struct ksignal *ksig)
672{
673 return IS_ENABLED(CONFIG_X86_32) || is_ia32_compat_frame(ksig);
674}
675
676static inline int is_x32_frame(struct ksignal *ksig)
677{
678 return IS_ENABLED(CONFIG_X86_X32_ABI) &&
679 ksig->ka.sa.sa_flags & SA_X32_ABI;
680}
681
682static int
683setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
684{
685 int usig = ksig->sig;
686 sigset_t *set = sigmask_to_save();
687 compat_sigset_t *cset = (compat_sigset_t *) set;
688
689
690 if (is_ia32_frame(ksig)) {
691 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
692 return ia32_setup_rt_frame(usig, ksig, cset, regs);
693 else
694 return ia32_setup_frame(usig, ksig, cset, regs);
695 } else if (is_x32_frame(ksig)) {
696 return x32_setup_rt_frame(ksig, cset, regs);
697 } else {
698 return __setup_rt_frame(ksig->sig, ksig, set, regs);
699 }
700}
701
702static void
703handle_signal(struct ksignal *ksig, struct pt_regs *regs)
704{
705 bool stepping, failed;
706 struct fpu *fpu = ¤t->thread.fpu;
707
708 if (v8086_mode(regs))
709 save_v86_state((struct kernel_vm86_regs *) regs, VM86_SIGNAL);
710
711
712 if (syscall_get_nr(current, regs) >= 0) {
713
714 switch (syscall_get_error(current, regs)) {
715 case -ERESTART_RESTARTBLOCK:
716 case -ERESTARTNOHAND:
717 regs->ax = -EINTR;
718 break;
719
720 case -ERESTARTSYS:
721 if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
722 regs->ax = -EINTR;
723 break;
724 }
725
726 case -ERESTARTNOINTR:
727 regs->ax = regs->orig_ax;
728 regs->ip -= 2;
729 break;
730 }
731 }
732
733
734
735
736
737
738 stepping = test_thread_flag(TIF_SINGLESTEP);
739 if (stepping)
740 user_disable_single_step(current);
741
742 failed = (setup_rt_frame(ksig, regs) < 0);
743 if (!failed) {
744
745
746
747
748
749
750
751
752
753
754 regs->flags &= ~(X86_EFLAGS_DF|X86_EFLAGS_RF|X86_EFLAGS_TF);
755
756
757
758 if (fpu->fpstate_active)
759 fpu__clear(fpu);
760 }
761 signal_setup_done(failed, ksig, stepping);
762}
763
764static inline unsigned long get_nr_restart_syscall(const struct pt_regs *regs)
765{
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788#ifdef CONFIG_IA32_EMULATION
789 if (current->thread.status & (TS_COMPAT|TS_I386_REGS_POKED))
790 return __NR_ia32_restart_syscall;
791#endif
792#ifdef CONFIG_X86_X32_ABI
793 return __NR_restart_syscall | (regs->orig_ax & __X32_SYSCALL_BIT);
794#else
795 return __NR_restart_syscall;
796#endif
797}
798
799
800
801
802
803
804void do_signal(struct pt_regs *regs)
805{
806 struct ksignal ksig;
807
808 if (get_signal(&ksig)) {
809
810 handle_signal(&ksig, regs);
811 return;
812 }
813
814
815 if (syscall_get_nr(current, regs) >= 0) {
816
817 switch (syscall_get_error(current, regs)) {
818 case -ERESTARTNOHAND:
819 case -ERESTARTSYS:
820 case -ERESTARTNOINTR:
821 regs->ax = regs->orig_ax;
822 regs->ip -= 2;
823 break;
824
825 case -ERESTART_RESTARTBLOCK:
826 regs->ax = get_nr_restart_syscall(regs);
827 regs->ip -= 2;
828 break;
829 }
830 }
831
832
833
834
835
836 restore_saved_sigmask();
837}
838
839void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
840{
841 struct task_struct *me = current;
842
843 if (show_unhandled_signals && printk_ratelimit()) {
844 printk("%s"
845 "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx",
846 task_pid_nr(current) > 1 ? KERN_INFO : KERN_EMERG,
847 me->comm, me->pid, where, frame,
848 regs->ip, regs->sp, regs->orig_ax);
849 print_vma_addr(KERN_CONT " in ", regs->ip);
850 pr_cont("\n");
851 }
852
853 force_sig(SIGSEGV, me);
854}
855
856#ifdef CONFIG_X86_X32_ABI
857asmlinkage long sys32_x32_rt_sigreturn(void)
858{
859 struct pt_regs *regs = current_pt_regs();
860 struct rt_sigframe_x32 __user *frame;
861 sigset_t set;
862 unsigned long uc_flags;
863
864 frame = (struct rt_sigframe_x32 __user *)(regs->sp - 8);
865
866 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
867 goto badframe;
868 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
869 goto badframe;
870 if (__get_user(uc_flags, &frame->uc.uc_flags))
871 goto badframe;
872
873 set_current_blocked(&set);
874
875 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, uc_flags))
876 goto badframe;
877
878 if (compat_restore_altstack(&frame->uc.uc_stack))
879 goto badframe;
880
881 return regs->ax;
882
883badframe:
884 signal_fault(regs, frame, "x32 rt_sigreturn");
885 return 0;
886}
887#endif
888