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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 | 2 | * Copyright (C) 1991, 1992 Linus Torvalds |
e5fa2d06 | 3 | * Copyright (C) 2000, 2001, 2002 Andi Kleen SuSE Labs |
1da177e4 LT |
4 | * |
5 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson | |
6 | * 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes | |
e5fa2d06 | 7 | * 2000-2002 x86-64 support by Andi Kleen |
1da177e4 | 8 | */ |
5c9b3a0c HS |
9 | #include <linux/sched.h> |
10 | #include <linux/mm.h> | |
11 | #include <linux/smp.h> | |
1da177e4 | 12 | #include <linux/kernel.h> |
1da177e4 LT |
13 | #include <linux/errno.h> |
14 | #include <linux/wait.h> | |
36a03308 | 15 | #include <linux/tracehook.h> |
5c9b3a0c HS |
16 | #include <linux/unistd.h> |
17 | #include <linux/stddef.h> | |
18 | #include <linux/personality.h> | |
19 | #include <linux/uaccess.h> | |
7c68af6e | 20 | #include <linux/user-return-notifier.h> |
0326f5a9 | 21 | #include <linux/uprobes.h> |
7e907f48 | 22 | |
1da177e4 LT |
23 | #include <asm/processor.h> |
24 | #include <asm/ucontext.h> | |
1da177e4 | 25 | #include <asm/i387.h> |
1361b83a | 26 | #include <asm/fpu-internal.h> |
6c3652ef | 27 | #include <asm/vdso.h> |
4efc0670 | 28 | #include <asm/mce.h> |
f28f0c23 | 29 | #include <asm/sighandling.h> |
5c9b3a0c HS |
30 | |
31 | #ifdef CONFIG_X86_64 | |
32 | #include <asm/proto.h> | |
33 | #include <asm/ia32_unistd.h> | |
c5a37394 | 34 | #include <asm/sys_ia32.h> |
5c9b3a0c HS |
35 | #endif /* CONFIG_X86_64 */ |
36 | ||
bb57925f | 37 | #include <asm/syscall.h> |
bbc1f698 | 38 | #include <asm/syscalls.h> |
7e907f48 | 39 | |
41af86fa | 40 | #include <asm/sigframe.h> |
1da177e4 | 41 | |
1a176803 HH |
42 | #ifdef CONFIG_X86_32 |
43 | # define FIX_EFLAGS (__FIX_EFLAGS | X86_EFLAGS_RF) | |
44 | #else | |
45 | # define FIX_EFLAGS __FIX_EFLAGS | |
46 | #endif | |
47 | ||
d9a89a26 TH |
48 | #define COPY(x) do { \ |
49 | get_user_ex(regs->x, &sc->x); \ | |
50 | } while (0) | |
2601657d | 51 | |
d9a89a26 TH |
52 | #define GET_SEG(seg) ({ \ |
53 | unsigned short tmp; \ | |
54 | get_user_ex(tmp, &sc->seg); \ | |
55 | tmp; \ | |
56 | }) | |
2601657d | 57 | |
d9a89a26 TH |
58 | #define COPY_SEG(seg) do { \ |
59 | regs->seg = GET_SEG(seg); \ | |
60 | } while (0) | |
2601657d | 61 | |
d9a89a26 TH |
62 | #define COPY_SEG_CPL3(seg) do { \ |
63 | regs->seg = GET_SEG(seg) | 3; \ | |
64 | } while (0) | |
2601657d | 65 | |
85139422 PA |
66 | int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, |
67 | unsigned long *pax) | |
2601657d HS |
68 | { |
69 | void __user *buf; | |
70 | unsigned int tmpflags; | |
71 | unsigned int err = 0; | |
72 | ||
73 | /* Always make any pending restarted system calls return -EINTR */ | |
74 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
75 | ||
98e3d45e HS |
76 | get_user_try { |
77 | ||
2601657d | 78 | #ifdef CONFIG_X86_32 |
d9a89a26 | 79 | set_user_gs(regs, GET_SEG(gs)); |
98e3d45e HS |
80 | COPY_SEG(fs); |
81 | COPY_SEG(es); | |
82 | COPY_SEG(ds); | |
2601657d HS |
83 | #endif /* CONFIG_X86_32 */ |
84 | ||
98e3d45e HS |
85 | COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx); |
86 | COPY(dx); COPY(cx); COPY(ip); | |
2601657d HS |
87 | |
88 | #ifdef CONFIG_X86_64 | |
98e3d45e HS |
89 | COPY(r8); |
90 | COPY(r9); | |
91 | COPY(r10); | |
92 | COPY(r11); | |
93 | COPY(r12); | |
94 | COPY(r13); | |
95 | COPY(r14); | |
96 | COPY(r15); | |
2601657d HS |
97 | #endif /* CONFIG_X86_64 */ |
98 | ||
99 | #ifdef CONFIG_X86_32 | |
98e3d45e HS |
100 | COPY_SEG_CPL3(cs); |
101 | COPY_SEG_CPL3(ss); | |
2601657d | 102 | #else /* !CONFIG_X86_32 */ |
98e3d45e HS |
103 | /* Kernel saves and restores only the CS segment register on signals, |
104 | * which is the bare minimum needed to allow mixed 32/64-bit code. | |
105 | * App's signal handler can save/restore other segments if needed. */ | |
106 | COPY_SEG_CPL3(cs); | |
2601657d HS |
107 | #endif /* CONFIG_X86_32 */ |
108 | ||
98e3d45e HS |
109 | get_user_ex(tmpflags, &sc->flags); |
110 | regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS); | |
111 | regs->orig_ax = -1; /* disable syscall checks */ | |
112 | ||
113 | get_user_ex(buf, &sc->fpstate); | |
114 | err |= restore_i387_xstate(buf); | |
2601657d | 115 | |
98e3d45e HS |
116 | get_user_ex(*pax, &sc->ax); |
117 | } get_user_catch(err); | |
2601657d | 118 | |
2601657d HS |
119 | return err; |
120 | } | |
121 | ||
85139422 PA |
122 | int setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate, |
123 | struct pt_regs *regs, unsigned long mask) | |
2601657d HS |
124 | { |
125 | int err = 0; | |
126 | ||
98e3d45e | 127 | put_user_try { |
2601657d | 128 | |
98e3d45e | 129 | #ifdef CONFIG_X86_32 |
d9a89a26 | 130 | put_user_ex(get_user_gs(regs), (unsigned int __user *)&sc->gs); |
98e3d45e HS |
131 | put_user_ex(regs->fs, (unsigned int __user *)&sc->fs); |
132 | put_user_ex(regs->es, (unsigned int __user *)&sc->es); | |
133 | put_user_ex(regs->ds, (unsigned int __user *)&sc->ds); | |
2601657d HS |
134 | #endif /* CONFIG_X86_32 */ |
135 | ||
98e3d45e HS |
136 | put_user_ex(regs->di, &sc->di); |
137 | put_user_ex(regs->si, &sc->si); | |
138 | put_user_ex(regs->bp, &sc->bp); | |
139 | put_user_ex(regs->sp, &sc->sp); | |
140 | put_user_ex(regs->bx, &sc->bx); | |
141 | put_user_ex(regs->dx, &sc->dx); | |
142 | put_user_ex(regs->cx, &sc->cx); | |
143 | put_user_ex(regs->ax, &sc->ax); | |
2601657d | 144 | #ifdef CONFIG_X86_64 |
98e3d45e HS |
145 | put_user_ex(regs->r8, &sc->r8); |
146 | put_user_ex(regs->r9, &sc->r9); | |
147 | put_user_ex(regs->r10, &sc->r10); | |
148 | put_user_ex(regs->r11, &sc->r11); | |
149 | put_user_ex(regs->r12, &sc->r12); | |
150 | put_user_ex(regs->r13, &sc->r13); | |
151 | put_user_ex(regs->r14, &sc->r14); | |
152 | put_user_ex(regs->r15, &sc->r15); | |
2601657d HS |
153 | #endif /* CONFIG_X86_64 */ |
154 | ||
51e7dc70 | 155 | put_user_ex(current->thread.trap_nr, &sc->trapno); |
98e3d45e HS |
156 | put_user_ex(current->thread.error_code, &sc->err); |
157 | put_user_ex(regs->ip, &sc->ip); | |
2601657d | 158 | #ifdef CONFIG_X86_32 |
98e3d45e HS |
159 | put_user_ex(regs->cs, (unsigned int __user *)&sc->cs); |
160 | put_user_ex(regs->flags, &sc->flags); | |
161 | put_user_ex(regs->sp, &sc->sp_at_signal); | |
162 | put_user_ex(regs->ss, (unsigned int __user *)&sc->ss); | |
2601657d | 163 | #else /* !CONFIG_X86_32 */ |
98e3d45e HS |
164 | put_user_ex(regs->flags, &sc->flags); |
165 | put_user_ex(regs->cs, &sc->cs); | |
166 | put_user_ex(0, &sc->gs); | |
167 | put_user_ex(0, &sc->fs); | |
2601657d HS |
168 | #endif /* CONFIG_X86_32 */ |
169 | ||
98e3d45e | 170 | put_user_ex(fpstate, &sc->fpstate); |
2601657d | 171 | |
98e3d45e HS |
172 | /* non-iBCS2 extensions.. */ |
173 | put_user_ex(mask, &sc->oldmask); | |
174 | put_user_ex(current->thread.cr2, &sc->cr2); | |
175 | } put_user_catch(err); | |
2601657d HS |
176 | |
177 | return err; | |
178 | } | |
179 | ||
1da177e4 | 180 | /* |
bfeb91a9 | 181 | * Set up a signal frame. |
1da177e4 | 182 | */ |
1da177e4 LT |
183 | |
184 | /* | |
185 | * Determine which stack to use.. | |
186 | */ | |
1fae0279 HS |
187 | static unsigned long align_sigframe(unsigned long sp) |
188 | { | |
189 | #ifdef CONFIG_X86_32 | |
190 | /* | |
191 | * Align the stack pointer according to the i386 ABI, | |
192 | * i.e. so that on function entry ((sp + 4) & 15) == 0. | |
193 | */ | |
194 | sp = ((sp + 4) & -16ul) - 4; | |
195 | #else /* !CONFIG_X86_32 */ | |
196 | sp = round_down(sp, 16) - 8; | |
197 | #endif | |
198 | return sp; | |
199 | } | |
200 | ||
1da177e4 | 201 | static inline void __user * |
3c1c7f10 | 202 | get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size, |
144b0712 | 203 | void __user **fpstate) |
1da177e4 | 204 | { |
1da177e4 | 205 | /* Default to using normal stack */ |
75779f05 | 206 | unsigned long sp = regs->sp; |
14fc9fbc | 207 | int onsigstack = on_sig_stack(sp); |
75779f05 HS |
208 | |
209 | #ifdef CONFIG_X86_64 | |
210 | /* redzone */ | |
211 | sp -= 128; | |
212 | #endif /* CONFIG_X86_64 */ | |
1da177e4 | 213 | |
14fc9fbc HS |
214 | if (!onsigstack) { |
215 | /* This is the X/Open sanctioned signal stack switching. */ | |
216 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
0f8f3089 | 217 | if (current->sas_ss_size) |
14fc9fbc HS |
218 | sp = current->sas_ss_sp + current->sas_ss_size; |
219 | } else { | |
75779f05 | 220 | #ifdef CONFIG_X86_32 |
14fc9fbc HS |
221 | /* This is the legacy signal stack switching. */ |
222 | if ((regs->ss & 0xffff) != __USER_DS && | |
223 | !(ka->sa.sa_flags & SA_RESTORER) && | |
224 | ka->sa.sa_restorer) | |
225 | sp = (unsigned long) ka->sa.sa_restorer; | |
75779f05 | 226 | #endif /* CONFIG_X86_32 */ |
14fc9fbc | 227 | } |
1da177e4 LT |
228 | } |
229 | ||
3c1c7f10 | 230 | if (used_math()) { |
75779f05 | 231 | sp -= sig_xstate_size; |
25051702 HS |
232 | #ifdef CONFIG_X86_64 |
233 | sp = round_down(sp, 64); | |
234 | #endif /* CONFIG_X86_64 */ | |
235 | *fpstate = (void __user *)sp; | |
3c1c7f10 SS |
236 | } |
237 | ||
14fc9fbc HS |
238 | sp = align_sigframe(sp - frame_size); |
239 | ||
240 | /* | |
241 | * If we are on the alternate signal stack and would overflow it, don't. | |
242 | * Return an always-bogus address instead so we will die with SIGSEGV. | |
243 | */ | |
244 | if (onsigstack && !likely(on_sig_stack(sp))) | |
245 | return (void __user *)-1L; | |
246 | ||
247 | /* save i387 state */ | |
248 | if (used_math() && save_i387_xstate(*fpstate) < 0) | |
249 | return (void __user *)-1L; | |
250 | ||
251 | return (void __user *)sp; | |
1da177e4 LT |
252 | } |
253 | ||
75779f05 HS |
254 | #ifdef CONFIG_X86_32 |
255 | static const struct { | |
256 | u16 poplmovl; | |
257 | u32 val; | |
258 | u16 int80; | |
259 | } __attribute__((packed)) retcode = { | |
260 | 0xb858, /* popl %eax; movl $..., %eax */ | |
261 | __NR_sigreturn, | |
262 | 0x80cd, /* int $0x80 */ | |
263 | }; | |
264 | ||
265 | static const struct { | |
266 | u8 movl; | |
267 | u32 val; | |
268 | u16 int80; | |
269 | u8 pad; | |
270 | } __attribute__((packed)) rt_retcode = { | |
271 | 0xb8, /* movl $..., %eax */ | |
272 | __NR_rt_sigreturn, | |
273 | 0x80cd, /* int $0x80 */ | |
274 | 0 | |
275 | }; | |
276 | ||
7e907f48 | 277 | static int |
1d13024e HS |
278 | __setup_frame(int sig, struct k_sigaction *ka, sigset_t *set, |
279 | struct pt_regs *regs) | |
1da177e4 | 280 | { |
1da177e4 | 281 | struct sigframe __user *frame; |
7e907f48 | 282 | void __user *restorer; |
1da177e4 | 283 | int err = 0; |
ab513701 | 284 | void __user *fpstate = NULL; |
1da177e4 | 285 | |
3c1c7f10 | 286 | frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate); |
1da177e4 LT |
287 | |
288 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
3d0aedd9 | 289 | return -EFAULT; |
1da177e4 | 290 | |
2ba48e16 | 291 | if (__put_user(sig, &frame->sig)) |
3d0aedd9 | 292 | return -EFAULT; |
1da177e4 | 293 | |
2ba48e16 | 294 | if (setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0])) |
3d0aedd9 | 295 | return -EFAULT; |
1da177e4 LT |
296 | |
297 | if (_NSIG_WORDS > 1) { | |
2ba48e16 HS |
298 | if (__copy_to_user(&frame->extramask, &set->sig[1], |
299 | sizeof(frame->extramask))) | |
3d0aedd9 | 300 | return -EFAULT; |
1da177e4 LT |
301 | } |
302 | ||
1a3e4ca4 | 303 | if (current->mm->context.vdso) |
6c3652ef | 304 | restorer = VDSO32_SYMBOL(current->mm->context.vdso, sigreturn); |
9fbbd4dd | 305 | else |
ade1af77 | 306 | restorer = &frame->retcode; |
1da177e4 LT |
307 | if (ka->sa.sa_flags & SA_RESTORER) |
308 | restorer = ka->sa.sa_restorer; | |
309 | ||
310 | /* Set up to return from userspace. */ | |
311 | err |= __put_user(restorer, &frame->pretcode); | |
7e907f48 | 312 | |
1da177e4 | 313 | /* |
7e907f48 | 314 | * This is popl %eax ; movl $__NR_sigreturn, %eax ; int $0x80 |
1da177e4 LT |
315 | * |
316 | * WE DO NOT USE IT ANY MORE! It's only left here for historical | |
317 | * reasons and because gdb uses it as a signature to notice | |
318 | * signal handler stack frames. | |
319 | */ | |
4a612048 | 320 | err |= __put_user(*((u64 *)&retcode), (u64 *)frame->retcode); |
1da177e4 LT |
321 | |
322 | if (err) | |
3d0aedd9 | 323 | return -EFAULT; |
1da177e4 LT |
324 | |
325 | /* Set up registers for signal handler */ | |
7e907f48 IM |
326 | regs->sp = (unsigned long)frame; |
327 | regs->ip = (unsigned long)ka->sa.sa_handler; | |
328 | regs->ax = (unsigned long)sig; | |
92bc2056 HH |
329 | regs->dx = 0; |
330 | regs->cx = 0; | |
1da177e4 | 331 | |
65ea5b03 PA |
332 | regs->ds = __USER_DS; |
333 | regs->es = __USER_DS; | |
334 | regs->ss = __USER_DS; | |
335 | regs->cs = __USER_CS; | |
1da177e4 | 336 | |
283828f3 | 337 | return 0; |
1da177e4 LT |
338 | } |
339 | ||
1d13024e HS |
340 | static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
341 | sigset_t *set, struct pt_regs *regs) | |
1da177e4 | 342 | { |
1da177e4 | 343 | struct rt_sigframe __user *frame; |
7e907f48 | 344 | void __user *restorer; |
1da177e4 | 345 | int err = 0; |
ab513701 | 346 | void __user *fpstate = NULL; |
1da177e4 | 347 | |
3c1c7f10 | 348 | frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate); |
1da177e4 LT |
349 | |
350 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
3d0aedd9 | 351 | return -EFAULT; |
1da177e4 | 352 | |
98e3d45e HS |
353 | put_user_try { |
354 | put_user_ex(sig, &frame->sig); | |
355 | put_user_ex(&frame->info, &frame->pinfo); | |
356 | put_user_ex(&frame->uc, &frame->puc); | |
357 | err |= copy_siginfo_to_user(&frame->info, info); | |
358 | ||
359 | /* Create the ucontext. */ | |
360 | if (cpu_has_xsave) | |
361 | put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags); | |
362 | else | |
363 | put_user_ex(0, &frame->uc.uc_flags); | |
364 | put_user_ex(0, &frame->uc.uc_link); | |
365 | put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
366 | put_user_ex(sas_ss_flags(regs->sp), | |
367 | &frame->uc.uc_stack.ss_flags); | |
368 | put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
369 | err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate, | |
370 | regs, set->sig[0]); | |
371 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
372 | ||
373 | /* Set up to return from userspace. */ | |
374 | restorer = VDSO32_SYMBOL(current->mm->context.vdso, rt_sigreturn); | |
375 | if (ka->sa.sa_flags & SA_RESTORER) | |
376 | restorer = ka->sa.sa_restorer; | |
377 | put_user_ex(restorer, &frame->pretcode); | |
378 | ||
379 | /* | |
380 | * This is movl $__NR_rt_sigreturn, %ax ; int $0x80 | |
381 | * | |
382 | * WE DO NOT USE IT ANY MORE! It's only left here for historical | |
383 | * reasons and because gdb uses it as a signature to notice | |
384 | * signal handler stack frames. | |
385 | */ | |
386 | put_user_ex(*((u64 *)&rt_retcode), (u64 *)frame->retcode); | |
387 | } put_user_catch(err); | |
1da177e4 LT |
388 | |
389 | if (err) | |
3d0aedd9 | 390 | return -EFAULT; |
1da177e4 LT |
391 | |
392 | /* Set up registers for signal handler */ | |
7e907f48 IM |
393 | regs->sp = (unsigned long)frame; |
394 | regs->ip = (unsigned long)ka->sa.sa_handler; | |
13ad7725 | 395 | regs->ax = (unsigned long)sig; |
7e907f48 IM |
396 | regs->dx = (unsigned long)&frame->info; |
397 | regs->cx = (unsigned long)&frame->uc; | |
1da177e4 | 398 | |
65ea5b03 PA |
399 | regs->ds = __USER_DS; |
400 | regs->es = __USER_DS; | |
401 | regs->ss = __USER_DS; | |
402 | regs->cs = __USER_CS; | |
1da177e4 | 403 | |
283828f3 | 404 | return 0; |
1da177e4 | 405 | } |
bfeb91a9 | 406 | #else /* !CONFIG_X86_32 */ |
bfeb91a9 HS |
407 | static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
408 | sigset_t *set, struct pt_regs *regs) | |
409 | { | |
410 | struct rt_sigframe __user *frame; | |
411 | void __user *fp = NULL; | |
412 | int err = 0; | |
413 | struct task_struct *me = current; | |
414 | ||
97286a2b | 415 | frame = get_sigframe(ka, regs, sizeof(struct rt_sigframe), &fp); |
bfeb91a9 HS |
416 | |
417 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
418 | return -EFAULT; | |
419 | ||
420 | if (ka->sa.sa_flags & SA_SIGINFO) { | |
421 | if (copy_siginfo_to_user(&frame->info, info)) | |
422 | return -EFAULT; | |
423 | } | |
424 | ||
98e3d45e HS |
425 | put_user_try { |
426 | /* Create the ucontext. */ | |
427 | if (cpu_has_xsave) | |
428 | put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags); | |
429 | else | |
430 | put_user_ex(0, &frame->uc.uc_flags); | |
431 | put_user_ex(0, &frame->uc.uc_link); | |
432 | put_user_ex(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
433 | put_user_ex(sas_ss_flags(regs->sp), | |
434 | &frame->uc.uc_stack.ss_flags); | |
435 | put_user_ex(me->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
436 | err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]); | |
437 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
438 | ||
439 | /* Set up to return from userspace. If provided, use a stub | |
440 | already in userspace. */ | |
441 | /* x86-64 should always use SA_RESTORER. */ | |
442 | if (ka->sa.sa_flags & SA_RESTORER) { | |
443 | put_user_ex(ka->sa.sa_restorer, &frame->pretcode); | |
444 | } else { | |
445 | /* could use a vstub here */ | |
446 | err |= -EFAULT; | |
447 | } | |
448 | } put_user_catch(err); | |
bfeb91a9 HS |
449 | |
450 | if (err) | |
451 | return -EFAULT; | |
452 | ||
453 | /* Set up registers for signal handler */ | |
454 | regs->di = sig; | |
455 | /* In case the signal handler was declared without prototypes */ | |
456 | regs->ax = 0; | |
457 | ||
458 | /* This also works for non SA_SIGINFO handlers because they expect the | |
459 | next argument after the signal number on the stack. */ | |
460 | regs->si = (unsigned long)&frame->info; | |
461 | regs->dx = (unsigned long)&frame->uc; | |
462 | regs->ip = (unsigned long) ka->sa.sa_handler; | |
463 | ||
464 | regs->sp = (unsigned long)frame; | |
465 | ||
466 | /* Set up the CS register to run signal handlers in 64-bit mode, | |
467 | even if the handler happens to be interrupting 32-bit code. */ | |
468 | regs->cs = __USER_CS; | |
469 | ||
470 | return 0; | |
471 | } | |
472 | #endif /* CONFIG_X86_32 */ | |
473 | ||
e5fa2d06 | 474 | #ifdef CONFIG_X86_32 |
bfeb91a9 HS |
475 | /* |
476 | * Atomically swap in the new signal mask, and wait for a signal. | |
477 | */ | |
478 | asmlinkage int | |
479 | sys_sigsuspend(int history0, int history1, old_sigset_t mask) | |
480 | { | |
3982294b | 481 | sigset_t blocked; |
3982294b | 482 | siginitset(&blocked, mask); |
68f3f16d | 483 | return sigsuspend(&blocked); |
bfeb91a9 HS |
484 | } |
485 | ||
486 | asmlinkage int | |
487 | sys_sigaction(int sig, const struct old_sigaction __user *act, | |
488 | struct old_sigaction __user *oact) | |
489 | { | |
490 | struct k_sigaction new_ka, old_ka; | |
98e3d45e | 491 | int ret = 0; |
bfeb91a9 HS |
492 | |
493 | if (act) { | |
494 | old_sigset_t mask; | |
495 | ||
98e3d45e | 496 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) |
bfeb91a9 HS |
497 | return -EFAULT; |
498 | ||
98e3d45e HS |
499 | get_user_try { |
500 | get_user_ex(new_ka.sa.sa_handler, &act->sa_handler); | |
501 | get_user_ex(new_ka.sa.sa_flags, &act->sa_flags); | |
502 | get_user_ex(mask, &act->sa_mask); | |
503 | get_user_ex(new_ka.sa.sa_restorer, &act->sa_restorer); | |
504 | } get_user_catch(ret); | |
505 | ||
506 | if (ret) | |
507 | return -EFAULT; | |
bfeb91a9 HS |
508 | siginitset(&new_ka.sa.sa_mask, mask); |
509 | } | |
510 | ||
511 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
512 | ||
513 | if (!ret && oact) { | |
98e3d45e | 514 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) |
bfeb91a9 HS |
515 | return -EFAULT; |
516 | ||
98e3d45e HS |
517 | put_user_try { |
518 | put_user_ex(old_ka.sa.sa_handler, &oact->sa_handler); | |
519 | put_user_ex(old_ka.sa.sa_flags, &oact->sa_flags); | |
520 | put_user_ex(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); | |
521 | put_user_ex(old_ka.sa.sa_restorer, &oact->sa_restorer); | |
522 | } put_user_catch(ret); | |
523 | ||
524 | if (ret) | |
525 | return -EFAULT; | |
bfeb91a9 HS |
526 | } |
527 | ||
528 | return ret; | |
529 | } | |
e5fa2d06 | 530 | #endif /* CONFIG_X86_32 */ |
bfeb91a9 | 531 | |
052acad4 | 532 | long |
bfeb91a9 HS |
533 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, |
534 | struct pt_regs *regs) | |
535 | { | |
536 | return do_sigaltstack(uss, uoss, regs->sp); | |
537 | } | |
bfeb91a9 HS |
538 | |
539 | /* | |
540 | * Do a signal return; undo the signal stack. | |
541 | */ | |
e5fa2d06 | 542 | #ifdef CONFIG_X86_32 |
b12bdaf1 | 543 | unsigned long sys_sigreturn(struct pt_regs *regs) |
bfeb91a9 HS |
544 | { |
545 | struct sigframe __user *frame; | |
bfeb91a9 HS |
546 | unsigned long ax; |
547 | sigset_t set; | |
548 | ||
bfeb91a9 HS |
549 | frame = (struct sigframe __user *)(regs->sp - 8); |
550 | ||
551 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
552 | goto badframe; | |
553 | if (__get_user(set.sig[0], &frame->sc.oldmask) || (_NSIG_WORDS > 1 | |
554 | && __copy_from_user(&set.sig[1], &frame->extramask, | |
555 | sizeof(frame->extramask)))) | |
556 | goto badframe; | |
557 | ||
558 | sigdelsetmask(&set, ~_BLOCKABLE); | |
3982294b | 559 | set_current_blocked(&set); |
bfeb91a9 HS |
560 | |
561 | if (restore_sigcontext(regs, &frame->sc, &ax)) | |
562 | goto badframe; | |
563 | return ax; | |
564 | ||
565 | badframe: | |
ae417bb4 | 566 | signal_fault(regs, frame, "sigreturn"); |
bfeb91a9 HS |
567 | |
568 | return 0; | |
569 | } | |
e5fa2d06 | 570 | #endif /* CONFIG_X86_32 */ |
bfeb91a9 | 571 | |
74452509 | 572 | long sys_rt_sigreturn(struct pt_regs *regs) |
bfeb91a9 HS |
573 | { |
574 | struct rt_sigframe __user *frame; | |
575 | unsigned long ax; | |
576 | sigset_t set; | |
577 | ||
578 | frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long)); | |
579 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
580 | goto badframe; | |
581 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
582 | goto badframe; | |
583 | ||
584 | sigdelsetmask(&set, ~_BLOCKABLE); | |
e9bd3f0f | 585 | set_current_blocked(&set); |
bfeb91a9 HS |
586 | |
587 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax)) | |
588 | goto badframe; | |
589 | ||
590 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT) | |
591 | goto badframe; | |
592 | ||
593 | return ax; | |
594 | ||
595 | badframe: | |
596 | signal_fault(regs, frame, "rt_sigreturn"); | |
597 | return 0; | |
598 | } | |
599 | ||
1da177e4 | 600 | /* |
7e907f48 IM |
601 | * OK, we're invoking a handler: |
602 | */ | |
8d8c13bd HS |
603 | static int signr_convert(int sig) |
604 | { | |
96bf84b7 | 605 | #ifdef CONFIG_X86_32 |
8d8c13bd HS |
606 | struct thread_info *info = current_thread_info(); |
607 | ||
608 | if (info->exec_domain && info->exec_domain->signal_invmap && sig < 32) | |
609 | return info->exec_domain->signal_invmap[sig]; | |
96bf84b7 | 610 | #endif /* CONFIG_X86_32 */ |
8d8c13bd HS |
611 | return sig; |
612 | } | |
613 | ||
cabf5035 HS |
614 | #ifdef CONFIG_X86_32 |
615 | ||
455edbc4 | 616 | #define is_ia32 1 |
4694d239 HS |
617 | #define ia32_setup_frame __setup_frame |
618 | #define ia32_setup_rt_frame __setup_rt_frame | |
455edbc4 | 619 | |
cabf5035 HS |
620 | #else /* !CONFIG_X86_32 */ |
621 | ||
622 | #ifdef CONFIG_IA32_EMULATION | |
623 | #define is_ia32 test_thread_flag(TIF_IA32) | |
624 | #else /* !CONFIG_IA32_EMULATION */ | |
625 | #define is_ia32 0 | |
626 | #endif /* CONFIG_IA32_EMULATION */ | |
627 | ||
c5a37394 PA |
628 | #ifdef CONFIG_X86_X32_ABI |
629 | #define is_x32 test_thread_flag(TIF_X32) | |
630 | ||
631 | static int x32_setup_rt_frame(int sig, struct k_sigaction *ka, | |
632 | siginfo_t *info, compat_sigset_t *set, | |
633 | struct pt_regs *regs); | |
634 | #else /* !CONFIG_X86_X32_ABI */ | |
635 | #define is_x32 0 | |
636 | #endif /* CONFIG_X86_X32_ABI */ | |
637 | ||
f5223763 HS |
638 | int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
639 | sigset_t *set, struct pt_regs *regs); | |
640 | int ia32_setup_frame(int sig, struct k_sigaction *ka, | |
641 | sigset_t *set, struct pt_regs *regs); | |
642 | ||
cabf5035 HS |
643 | #endif /* CONFIG_X86_32 */ |
644 | ||
1d13024e HS |
645 | static int |
646 | setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, | |
9b429620 | 647 | struct pt_regs *regs) |
1d13024e | 648 | { |
8d8c13bd | 649 | int usig = signr_convert(sig); |
b7f9a11a | 650 | sigset_t *set = sigmask_to_save(); |
1d13024e HS |
651 | int ret; |
652 | ||
653 | /* Set up the stack frame */ | |
455edbc4 HS |
654 | if (is_ia32) { |
655 | if (ka->sa.sa_flags & SA_SIGINFO) | |
4694d239 | 656 | ret = ia32_setup_rt_frame(usig, ka, info, set, regs); |
455edbc4 | 657 | else |
4694d239 | 658 | ret = ia32_setup_frame(usig, ka, set, regs); |
c5a37394 PA |
659 | #ifdef CONFIG_X86_X32_ABI |
660 | } else if (is_x32) { | |
661 | ret = x32_setup_rt_frame(usig, ka, info, | |
662 | (compat_sigset_t *)set, regs); | |
663 | #endif | |
664 | } else { | |
455edbc4 | 665 | ret = __setup_rt_frame(sig, ka, info, set, regs); |
c5a37394 | 666 | } |
1d13024e | 667 | |
3d0aedd9 HS |
668 | if (ret) { |
669 | force_sigsegv(sig, current); | |
670 | return -EFAULT; | |
671 | } | |
672 | ||
9b429620 | 673 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; |
1d13024e HS |
674 | return ret; |
675 | } | |
676 | ||
7c1def16 | 677 | static int |
1da177e4 | 678 | handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, |
9b429620 | 679 | struct pt_regs *regs) |
1da177e4 | 680 | { |
7c1def16 RM |
681 | int ret; |
682 | ||
1da177e4 | 683 | /* Are we from a system call? */ |
bb57925f | 684 | if (syscall_get_nr(current, regs) >= 0) { |
1da177e4 | 685 | /* If so, check system call restarting.. */ |
bb57925f | 686 | switch (syscall_get_error(current, regs)) { |
ac66f3fd HH |
687 | case -ERESTART_RESTARTBLOCK: |
688 | case -ERESTARTNOHAND: | |
689 | regs->ax = -EINTR; | |
690 | break; | |
691 | ||
692 | case -ERESTARTSYS: | |
693 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
65ea5b03 | 694 | regs->ax = -EINTR; |
1da177e4 | 695 | break; |
ac66f3fd HH |
696 | } |
697 | /* fallthrough */ | |
698 | case -ERESTARTNOINTR: | |
699 | regs->ax = regs->orig_ax; | |
700 | regs->ip -= 2; | |
701 | break; | |
1da177e4 LT |
702 | } |
703 | } | |
704 | ||
705 | /* | |
e1f28773 RM |
706 | * If TF is set due to a debugger (TIF_FORCED_TF), clear the TF |
707 | * flag so that register information in the sigcontext is correct. | |
1da177e4 | 708 | */ |
65ea5b03 | 709 | if (unlikely(regs->flags & X86_EFLAGS_TF) && |
e1f28773 | 710 | likely(test_and_clear_thread_flag(TIF_FORCED_TF))) |
65ea5b03 | 711 | regs->flags &= ~X86_EFLAGS_TF; |
1da177e4 | 712 | |
9b429620 | 713 | ret = setup_rt_frame(sig, ka, info, regs); |
1da177e4 | 714 | |
7e907f48 IM |
715 | if (ret) |
716 | return ret; | |
7c1def16 | 717 | |
8b9c5ff3 RM |
718 | /* |
719 | * Clear the direction flag as per the ABI for function entry. | |
720 | */ | |
721 | regs->flags &= ~X86_EFLAGS_DF; | |
722 | ||
723 | /* | |
724 | * Clear TF when entering the signal handler, but | |
725 | * notify any tracer that was single-stepping it. | |
726 | * The tracer may want to single-step inside the | |
727 | * handler too. | |
728 | */ | |
729 | regs->flags &= ~X86_EFLAGS_TF; | |
8b9c5ff3 | 730 | |
5e6292c0 | 731 | block_sigmask(ka, sig); |
7e907f48 | 732 | |
36a03308 RM |
733 | tracehook_signal_handler(sig, info, ka, regs, |
734 | test_thread_flag(TIF_SINGLESTEP)); | |
735 | ||
7e907f48 | 736 | return 0; |
1da177e4 LT |
737 | } |
738 | ||
57917752 | 739 | #ifdef CONFIG_X86_32 |
8fcd8e20 | 740 | #define NR_restart_syscall __NR_restart_syscall |
57917752 HS |
741 | #else /* !CONFIG_X86_32 */ |
742 | #define NR_restart_syscall \ | |
743 | test_thread_flag(TIF_IA32) ? __NR_ia32_restart_syscall : __NR_restart_syscall | |
744 | #endif /* CONFIG_X86_32 */ | |
745 | ||
1da177e4 LT |
746 | /* |
747 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
748 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
749 | * mistake. | |
750 | */ | |
75604d7f | 751 | static void do_signal(struct pt_regs *regs) |
1da177e4 | 752 | { |
ac66f3fd | 753 | struct k_sigaction ka; |
1da177e4 LT |
754 | siginfo_t info; |
755 | int signr; | |
1da177e4 LT |
756 | |
757 | /* | |
ac66f3fd HH |
758 | * We want the common case to go fast, which is why we may in certain |
759 | * cases get here from kernel mode. Just return without doing anything | |
760 | * if so. | |
761 | * X86_32: vm86 regs switched out by assembly code before reaching | |
762 | * here, so testing against kernel CS suffices. | |
1da177e4 | 763 | */ |
717b594a | 764 | if (!user_mode(regs)) |
283828f3 | 765 | return; |
1da177e4 | 766 | |
1da177e4 LT |
767 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
768 | if (signr > 0) { | |
7e907f48 | 769 | /* Whee! Actually deliver the signal. */ |
9b429620 | 770 | handle_signal(signr, &info, &ka, regs); |
283828f3 | 771 | return; |
1da177e4 LT |
772 | } |
773 | ||
1da177e4 | 774 | /* Did we come from a system call? */ |
bb57925f | 775 | if (syscall_get_nr(current, regs) >= 0) { |
1da177e4 | 776 | /* Restart the system call - no handlers present */ |
bb57925f | 777 | switch (syscall_get_error(current, regs)) { |
283828f3 DH |
778 | case -ERESTARTNOHAND: |
779 | case -ERESTARTSYS: | |
780 | case -ERESTARTNOINTR: | |
65ea5b03 PA |
781 | regs->ax = regs->orig_ax; |
782 | regs->ip -= 2; | |
283828f3 DH |
783 | break; |
784 | ||
785 | case -ERESTART_RESTARTBLOCK: | |
8fcd8e20 | 786 | regs->ax = NR_restart_syscall; |
65ea5b03 | 787 | regs->ip -= 2; |
283828f3 | 788 | break; |
1da177e4 LT |
789 | } |
790 | } | |
283828f3 | 791 | |
ac66f3fd HH |
792 | /* |
793 | * If there's no signal to deliver, we just put the saved sigmask | |
794 | * back. | |
795 | */ | |
51a7b448 | 796 | restore_saved_sigmask(); |
1da177e4 LT |
797 | } |
798 | ||
799 | /* | |
800 | * notification of userspace execution resumption | |
283828f3 | 801 | * - triggered by the TIF_WORK_MASK flags |
1da177e4 | 802 | */ |
7e907f48 IM |
803 | void |
804 | do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags) | |
1da177e4 | 805 | { |
c1ebf835 | 806 | #ifdef CONFIG_X86_MCE |
ee847c54 HS |
807 | /* notify userspace of pending MCEs */ |
808 | if (thread_info_flags & _TIF_MCE_NOTIFY) | |
9b1beaf2 | 809 | mce_notify_process(); |
ee847c54 HS |
810 | #endif /* CONFIG_X86_64 && CONFIG_X86_MCE */ |
811 | ||
0326f5a9 SD |
812 | if (thread_info_flags & _TIF_UPROBE) { |
813 | clear_thread_flag(TIF_UPROBE); | |
814 | uprobe_notify_resume(regs); | |
815 | } | |
816 | ||
1da177e4 | 817 | /* deal with pending signal delivery */ |
5a8da0ea | 818 | if (thread_info_flags & _TIF_SIGPENDING) |
283828f3 | 819 | do_signal(regs); |
8f4d37ec | 820 | |
59e52130 RM |
821 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { |
822 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
823 | tracehook_notify_resume(regs); | |
824 | } | |
7c68af6e AK |
825 | if (thread_info_flags & _TIF_USER_RETURN_NOTIFY) |
826 | fire_user_return_notifiers(); | |
59e52130 | 827 | |
ee847c54 | 828 | #ifdef CONFIG_X86_32 |
1da177e4 | 829 | clear_thread_flag(TIF_IRET); |
ee847c54 | 830 | #endif /* CONFIG_X86_32 */ |
1da177e4 | 831 | } |
72fa50f4 HS |
832 | |
833 | void signal_fault(struct pt_regs *regs, void __user *frame, char *where) | |
834 | { | |
835 | struct task_struct *me = current; | |
836 | ||
837 | if (show_unhandled_signals && printk_ratelimit()) { | |
ae417bb4 | 838 | printk("%s" |
72fa50f4 | 839 | "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx", |
ae417bb4 | 840 | task_pid_nr(current) > 1 ? KERN_INFO : KERN_EMERG, |
72fa50f4 HS |
841 | me->comm, me->pid, where, frame, |
842 | regs->ip, regs->sp, regs->orig_ax); | |
843 | print_vma_addr(" in ", regs->ip); | |
844 | printk(KERN_CONT "\n"); | |
845 | } | |
846 | ||
847 | force_sig(SIGSEGV, me); | |
848 | } | |
c5a37394 PA |
849 | |
850 | #ifdef CONFIG_X86_X32_ABI | |
851 | static int x32_setup_rt_frame(int sig, struct k_sigaction *ka, | |
852 | siginfo_t *info, compat_sigset_t *set, | |
853 | struct pt_regs *regs) | |
854 | { | |
855 | struct rt_sigframe_x32 __user *frame; | |
856 | void __user *restorer; | |
857 | int err = 0; | |
858 | void __user *fpstate = NULL; | |
859 | ||
860 | frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate); | |
861 | ||
862 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
863 | return -EFAULT; | |
864 | ||
865 | if (ka->sa.sa_flags & SA_SIGINFO) { | |
866 | if (copy_siginfo_to_user32(&frame->info, info)) | |
867 | return -EFAULT; | |
868 | } | |
869 | ||
870 | put_user_try { | |
871 | /* Create the ucontext. */ | |
872 | if (cpu_has_xsave) | |
873 | put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags); | |
874 | else | |
875 | put_user_ex(0, &frame->uc.uc_flags); | |
876 | put_user_ex(0, &frame->uc.uc_link); | |
877 | put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
878 | put_user_ex(sas_ss_flags(regs->sp), | |
879 | &frame->uc.uc_stack.ss_flags); | |
880 | put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
881 | put_user_ex(0, &frame->uc.uc__pad0); | |
882 | err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate, | |
883 | regs, set->sig[0]); | |
884 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
885 | ||
886 | if (ka->sa.sa_flags & SA_RESTORER) { | |
887 | restorer = ka->sa.sa_restorer; | |
888 | } else { | |
889 | /* could use a vstub here */ | |
890 | restorer = NULL; | |
891 | err |= -EFAULT; | |
892 | } | |
893 | put_user_ex(restorer, &frame->pretcode); | |
894 | } put_user_catch(err); | |
895 | ||
896 | if (err) | |
897 | return -EFAULT; | |
898 | ||
899 | /* Set up registers for signal handler */ | |
900 | regs->sp = (unsigned long) frame; | |
901 | regs->ip = (unsigned long) ka->sa.sa_handler; | |
902 | ||
903 | /* We use the x32 calling convention here... */ | |
904 | regs->di = sig; | |
905 | regs->si = (unsigned long) &frame->info; | |
906 | regs->dx = (unsigned long) &frame->uc; | |
907 | ||
908 | loadsegment(ds, __USER_DS); | |
909 | loadsegment(es, __USER_DS); | |
910 | ||
911 | regs->cs = __USER_CS; | |
912 | regs->ss = __USER_DS; | |
913 | ||
914 | return 0; | |
915 | } | |
916 | ||
917 | asmlinkage long sys32_x32_rt_sigreturn(struct pt_regs *regs) | |
918 | { | |
919 | struct rt_sigframe_x32 __user *frame; | |
920 | sigset_t set; | |
921 | unsigned long ax; | |
922 | struct pt_regs tregs; | |
923 | ||
924 | frame = (struct rt_sigframe_x32 __user *)(regs->sp - 8); | |
925 | ||
926 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
927 | goto badframe; | |
928 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
929 | goto badframe; | |
930 | ||
931 | sigdelsetmask(&set, ~_BLOCKABLE); | |
932 | set_current_blocked(&set); | |
933 | ||
934 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax)) | |
935 | goto badframe; | |
936 | ||
937 | tregs = *regs; | |
938 | if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, &tregs) == -EFAULT) | |
939 | goto badframe; | |
940 | ||
941 | return ax; | |
942 | ||
943 | badframe: | |
944 | signal_fault(regs, frame, "x32 rt_sigreturn"); | |
945 | return 0; | |
946 | } | |
947 | #endif |