Commit | Line | Data |
---|---|---|
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 | */ |
c767a54b JP |
9 | |
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
11 | ||
5c9b3a0c HS |
12 | #include <linux/sched.h> |
13 | #include <linux/mm.h> | |
14 | #include <linux/smp.h> | |
1da177e4 | 15 | #include <linux/kernel.h> |
1da177e4 LT |
16 | #include <linux/errno.h> |
17 | #include <linux/wait.h> | |
36a03308 | 18 | #include <linux/tracehook.h> |
5c9b3a0c HS |
19 | #include <linux/unistd.h> |
20 | #include <linux/stddef.h> | |
21 | #include <linux/personality.h> | |
22 | #include <linux/uaccess.h> | |
7c68af6e | 23 | #include <linux/user-return-notifier.h> |
0326f5a9 | 24 | #include <linux/uprobes.h> |
7e907f48 | 25 | |
1da177e4 LT |
26 | #include <asm/processor.h> |
27 | #include <asm/ucontext.h> | |
1da177e4 | 28 | #include <asm/i387.h> |
1361b83a | 29 | #include <asm/fpu-internal.h> |
6c3652ef | 30 | #include <asm/vdso.h> |
4efc0670 | 31 | #include <asm/mce.h> |
f28f0c23 | 32 | #include <asm/sighandling.h> |
5c9b3a0c HS |
33 | |
34 | #ifdef CONFIG_X86_64 | |
35 | #include <asm/proto.h> | |
36 | #include <asm/ia32_unistd.h> | |
c5a37394 | 37 | #include <asm/sys_ia32.h> |
5c9b3a0c HS |
38 | #endif /* CONFIG_X86_64 */ |
39 | ||
bb57925f | 40 | #include <asm/syscall.h> |
bbc1f698 | 41 | #include <asm/syscalls.h> |
7e907f48 | 42 | |
41af86fa | 43 | #include <asm/sigframe.h> |
1da177e4 | 44 | |
1a176803 HH |
45 | #ifdef CONFIG_X86_32 |
46 | # define FIX_EFLAGS (__FIX_EFLAGS | X86_EFLAGS_RF) | |
47 | #else | |
48 | # define FIX_EFLAGS __FIX_EFLAGS | |
49 | #endif | |
50 | ||
d9a89a26 TH |
51 | #define COPY(x) do { \ |
52 | get_user_ex(regs->x, &sc->x); \ | |
53 | } while (0) | |
2601657d | 54 | |
d9a89a26 TH |
55 | #define GET_SEG(seg) ({ \ |
56 | unsigned short tmp; \ | |
57 | get_user_ex(tmp, &sc->seg); \ | |
58 | tmp; \ | |
59 | }) | |
2601657d | 60 | |
d9a89a26 TH |
61 | #define COPY_SEG(seg) do { \ |
62 | regs->seg = GET_SEG(seg); \ | |
63 | } while (0) | |
2601657d | 64 | |
d9a89a26 TH |
65 | #define COPY_SEG_CPL3(seg) do { \ |
66 | regs->seg = GET_SEG(seg) | 3; \ | |
67 | } while (0) | |
2601657d | 68 | |
85139422 PA |
69 | int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, |
70 | unsigned long *pax) | |
2601657d HS |
71 | { |
72 | void __user *buf; | |
73 | unsigned int tmpflags; | |
74 | unsigned int err = 0; | |
75 | ||
76 | /* Always make any pending restarted system calls return -EINTR */ | |
77 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
78 | ||
98e3d45e HS |
79 | get_user_try { |
80 | ||
2601657d | 81 | #ifdef CONFIG_X86_32 |
d9a89a26 | 82 | set_user_gs(regs, GET_SEG(gs)); |
98e3d45e HS |
83 | COPY_SEG(fs); |
84 | COPY_SEG(es); | |
85 | COPY_SEG(ds); | |
2601657d HS |
86 | #endif /* CONFIG_X86_32 */ |
87 | ||
98e3d45e HS |
88 | COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx); |
89 | COPY(dx); COPY(cx); COPY(ip); | |
2601657d HS |
90 | |
91 | #ifdef CONFIG_X86_64 | |
98e3d45e HS |
92 | COPY(r8); |
93 | COPY(r9); | |
94 | COPY(r10); | |
95 | COPY(r11); | |
96 | COPY(r12); | |
97 | COPY(r13); | |
98 | COPY(r14); | |
99 | COPY(r15); | |
2601657d HS |
100 | #endif /* CONFIG_X86_64 */ |
101 | ||
102 | #ifdef CONFIG_X86_32 | |
98e3d45e HS |
103 | COPY_SEG_CPL3(cs); |
104 | COPY_SEG_CPL3(ss); | |
2601657d | 105 | #else /* !CONFIG_X86_32 */ |
98e3d45e HS |
106 | /* Kernel saves and restores only the CS segment register on signals, |
107 | * which is the bare minimum needed to allow mixed 32/64-bit code. | |
108 | * App's signal handler can save/restore other segments if needed. */ | |
109 | COPY_SEG_CPL3(cs); | |
2601657d HS |
110 | #endif /* CONFIG_X86_32 */ |
111 | ||
98e3d45e HS |
112 | get_user_ex(tmpflags, &sc->flags); |
113 | regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS); | |
114 | regs->orig_ax = -1; /* disable syscall checks */ | |
115 | ||
116 | get_user_ex(buf, &sc->fpstate); | |
117 | err |= restore_i387_xstate(buf); | |
2601657d | 118 | |
98e3d45e HS |
119 | get_user_ex(*pax, &sc->ax); |
120 | } get_user_catch(err); | |
2601657d | 121 | |
2601657d HS |
122 | return err; |
123 | } | |
124 | ||
85139422 PA |
125 | int setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate, |
126 | struct pt_regs *regs, unsigned long mask) | |
2601657d HS |
127 | { |
128 | int err = 0; | |
129 | ||
98e3d45e | 130 | put_user_try { |
2601657d | 131 | |
98e3d45e | 132 | #ifdef CONFIG_X86_32 |
d9a89a26 | 133 | put_user_ex(get_user_gs(regs), (unsigned int __user *)&sc->gs); |
98e3d45e HS |
134 | put_user_ex(regs->fs, (unsigned int __user *)&sc->fs); |
135 | put_user_ex(regs->es, (unsigned int __user *)&sc->es); | |
136 | put_user_ex(regs->ds, (unsigned int __user *)&sc->ds); | |
2601657d HS |
137 | #endif /* CONFIG_X86_32 */ |
138 | ||
98e3d45e HS |
139 | put_user_ex(regs->di, &sc->di); |
140 | put_user_ex(regs->si, &sc->si); | |
141 | put_user_ex(regs->bp, &sc->bp); | |
142 | put_user_ex(regs->sp, &sc->sp); | |
143 | put_user_ex(regs->bx, &sc->bx); | |
144 | put_user_ex(regs->dx, &sc->dx); | |
145 | put_user_ex(regs->cx, &sc->cx); | |
146 | put_user_ex(regs->ax, &sc->ax); | |
2601657d | 147 | #ifdef CONFIG_X86_64 |
98e3d45e HS |
148 | put_user_ex(regs->r8, &sc->r8); |
149 | put_user_ex(regs->r9, &sc->r9); | |
150 | put_user_ex(regs->r10, &sc->r10); | |
151 | put_user_ex(regs->r11, &sc->r11); | |
152 | put_user_ex(regs->r12, &sc->r12); | |
153 | put_user_ex(regs->r13, &sc->r13); | |
154 | put_user_ex(regs->r14, &sc->r14); | |
155 | put_user_ex(regs->r15, &sc->r15); | |
2601657d HS |
156 | #endif /* CONFIG_X86_64 */ |
157 | ||
51e7dc70 | 158 | put_user_ex(current->thread.trap_nr, &sc->trapno); |
98e3d45e HS |
159 | put_user_ex(current->thread.error_code, &sc->err); |
160 | put_user_ex(regs->ip, &sc->ip); | |
2601657d | 161 | #ifdef CONFIG_X86_32 |
98e3d45e HS |
162 | put_user_ex(regs->cs, (unsigned int __user *)&sc->cs); |
163 | put_user_ex(regs->flags, &sc->flags); | |
164 | put_user_ex(regs->sp, &sc->sp_at_signal); | |
165 | put_user_ex(regs->ss, (unsigned int __user *)&sc->ss); | |
2601657d | 166 | #else /* !CONFIG_X86_32 */ |
98e3d45e HS |
167 | put_user_ex(regs->flags, &sc->flags); |
168 | put_user_ex(regs->cs, &sc->cs); | |
169 | put_user_ex(0, &sc->gs); | |
170 | put_user_ex(0, &sc->fs); | |
2601657d HS |
171 | #endif /* CONFIG_X86_32 */ |
172 | ||
98e3d45e | 173 | put_user_ex(fpstate, &sc->fpstate); |
2601657d | 174 | |
98e3d45e HS |
175 | /* non-iBCS2 extensions.. */ |
176 | put_user_ex(mask, &sc->oldmask); | |
177 | put_user_ex(current->thread.cr2, &sc->cr2); | |
178 | } put_user_catch(err); | |
2601657d HS |
179 | |
180 | return err; | |
181 | } | |
182 | ||
1da177e4 | 183 | /* |
bfeb91a9 | 184 | * Set up a signal frame. |
1da177e4 | 185 | */ |
1da177e4 LT |
186 | |
187 | /* | |
188 | * Determine which stack to use.. | |
189 | */ | |
1fae0279 HS |
190 | static unsigned long align_sigframe(unsigned long sp) |
191 | { | |
192 | #ifdef CONFIG_X86_32 | |
193 | /* | |
194 | * Align the stack pointer according to the i386 ABI, | |
195 | * i.e. so that on function entry ((sp + 4) & 15) == 0. | |
196 | */ | |
197 | sp = ((sp + 4) & -16ul) - 4; | |
198 | #else /* !CONFIG_X86_32 */ | |
199 | sp = round_down(sp, 16) - 8; | |
200 | #endif | |
201 | return sp; | |
202 | } | |
203 | ||
1da177e4 | 204 | static inline void __user * |
3c1c7f10 | 205 | get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size, |
144b0712 | 206 | void __user **fpstate) |
1da177e4 | 207 | { |
1da177e4 | 208 | /* Default to using normal stack */ |
75779f05 | 209 | unsigned long sp = regs->sp; |
14fc9fbc | 210 | int onsigstack = on_sig_stack(sp); |
75779f05 HS |
211 | |
212 | #ifdef CONFIG_X86_64 | |
213 | /* redzone */ | |
214 | sp -= 128; | |
215 | #endif /* CONFIG_X86_64 */ | |
1da177e4 | 216 | |
14fc9fbc HS |
217 | if (!onsigstack) { |
218 | /* This is the X/Open sanctioned signal stack switching. */ | |
219 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
0f8f3089 | 220 | if (current->sas_ss_size) |
14fc9fbc HS |
221 | sp = current->sas_ss_sp + current->sas_ss_size; |
222 | } else { | |
75779f05 | 223 | #ifdef CONFIG_X86_32 |
14fc9fbc HS |
224 | /* This is the legacy signal stack switching. */ |
225 | if ((regs->ss & 0xffff) != __USER_DS && | |
226 | !(ka->sa.sa_flags & SA_RESTORER) && | |
227 | ka->sa.sa_restorer) | |
228 | sp = (unsigned long) ka->sa.sa_restorer; | |
75779f05 | 229 | #endif /* CONFIG_X86_32 */ |
14fc9fbc | 230 | } |
1da177e4 LT |
231 | } |
232 | ||
3c1c7f10 | 233 | if (used_math()) { |
75779f05 | 234 | sp -= sig_xstate_size; |
25051702 HS |
235 | #ifdef CONFIG_X86_64 |
236 | sp = round_down(sp, 64); | |
237 | #endif /* CONFIG_X86_64 */ | |
238 | *fpstate = (void __user *)sp; | |
3c1c7f10 SS |
239 | } |
240 | ||
14fc9fbc HS |
241 | sp = align_sigframe(sp - frame_size); |
242 | ||
243 | /* | |
244 | * If we are on the alternate signal stack and would overflow it, don't. | |
245 | * Return an always-bogus address instead so we will die with SIGSEGV. | |
246 | */ | |
247 | if (onsigstack && !likely(on_sig_stack(sp))) | |
248 | return (void __user *)-1L; | |
249 | ||
250 | /* save i387 state */ | |
251 | if (used_math() && save_i387_xstate(*fpstate) < 0) | |
252 | return (void __user *)-1L; | |
253 | ||
254 | return (void __user *)sp; | |
1da177e4 LT |
255 | } |
256 | ||
75779f05 HS |
257 | #ifdef CONFIG_X86_32 |
258 | static const struct { | |
259 | u16 poplmovl; | |
260 | u32 val; | |
261 | u16 int80; | |
262 | } __attribute__((packed)) retcode = { | |
263 | 0xb858, /* popl %eax; movl $..., %eax */ | |
264 | __NR_sigreturn, | |
265 | 0x80cd, /* int $0x80 */ | |
266 | }; | |
267 | ||
268 | static const struct { | |
269 | u8 movl; | |
270 | u32 val; | |
271 | u16 int80; | |
272 | u8 pad; | |
273 | } __attribute__((packed)) rt_retcode = { | |
274 | 0xb8, /* movl $..., %eax */ | |
275 | __NR_rt_sigreturn, | |
276 | 0x80cd, /* int $0x80 */ | |
277 | 0 | |
278 | }; | |
279 | ||
7e907f48 | 280 | static int |
1d13024e HS |
281 | __setup_frame(int sig, struct k_sigaction *ka, sigset_t *set, |
282 | struct pt_regs *regs) | |
1da177e4 | 283 | { |
1da177e4 | 284 | struct sigframe __user *frame; |
7e907f48 | 285 | void __user *restorer; |
1da177e4 | 286 | int err = 0; |
ab513701 | 287 | void __user *fpstate = NULL; |
1da177e4 | 288 | |
3c1c7f10 | 289 | frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate); |
1da177e4 LT |
290 | |
291 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
3d0aedd9 | 292 | return -EFAULT; |
1da177e4 | 293 | |
2ba48e16 | 294 | if (__put_user(sig, &frame->sig)) |
3d0aedd9 | 295 | return -EFAULT; |
1da177e4 | 296 | |
2ba48e16 | 297 | if (setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0])) |
3d0aedd9 | 298 | return -EFAULT; |
1da177e4 LT |
299 | |
300 | if (_NSIG_WORDS > 1) { | |
2ba48e16 HS |
301 | if (__copy_to_user(&frame->extramask, &set->sig[1], |
302 | sizeof(frame->extramask))) | |
3d0aedd9 | 303 | return -EFAULT; |
1da177e4 LT |
304 | } |
305 | ||
1a3e4ca4 | 306 | if (current->mm->context.vdso) |
6c3652ef | 307 | restorer = VDSO32_SYMBOL(current->mm->context.vdso, sigreturn); |
9fbbd4dd | 308 | else |
ade1af77 | 309 | restorer = &frame->retcode; |
1da177e4 LT |
310 | if (ka->sa.sa_flags & SA_RESTORER) |
311 | restorer = ka->sa.sa_restorer; | |
312 | ||
313 | /* Set up to return from userspace. */ | |
314 | err |= __put_user(restorer, &frame->pretcode); | |
7e907f48 | 315 | |
1da177e4 | 316 | /* |
7e907f48 | 317 | * This is popl %eax ; movl $__NR_sigreturn, %eax ; int $0x80 |
1da177e4 LT |
318 | * |
319 | * WE DO NOT USE IT ANY MORE! It's only left here for historical | |
320 | * reasons and because gdb uses it as a signature to notice | |
321 | * signal handler stack frames. | |
322 | */ | |
4a612048 | 323 | err |= __put_user(*((u64 *)&retcode), (u64 *)frame->retcode); |
1da177e4 LT |
324 | |
325 | if (err) | |
3d0aedd9 | 326 | return -EFAULT; |
1da177e4 LT |
327 | |
328 | /* Set up registers for signal handler */ | |
7e907f48 IM |
329 | regs->sp = (unsigned long)frame; |
330 | regs->ip = (unsigned long)ka->sa.sa_handler; | |
331 | regs->ax = (unsigned long)sig; | |
92bc2056 HH |
332 | regs->dx = 0; |
333 | regs->cx = 0; | |
1da177e4 | 334 | |
65ea5b03 PA |
335 | regs->ds = __USER_DS; |
336 | regs->es = __USER_DS; | |
337 | regs->ss = __USER_DS; | |
338 | regs->cs = __USER_CS; | |
1da177e4 | 339 | |
283828f3 | 340 | return 0; |
1da177e4 LT |
341 | } |
342 | ||
1d13024e HS |
343 | static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
344 | sigset_t *set, struct pt_regs *regs) | |
1da177e4 | 345 | { |
1da177e4 | 346 | struct rt_sigframe __user *frame; |
7e907f48 | 347 | void __user *restorer; |
1da177e4 | 348 | int err = 0; |
ab513701 | 349 | void __user *fpstate = NULL; |
1da177e4 | 350 | |
3c1c7f10 | 351 | frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate); |
1da177e4 LT |
352 | |
353 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
3d0aedd9 | 354 | return -EFAULT; |
1da177e4 | 355 | |
98e3d45e HS |
356 | put_user_try { |
357 | put_user_ex(sig, &frame->sig); | |
358 | put_user_ex(&frame->info, &frame->pinfo); | |
359 | put_user_ex(&frame->uc, &frame->puc); | |
360 | err |= copy_siginfo_to_user(&frame->info, info); | |
361 | ||
362 | /* Create the ucontext. */ | |
363 | if (cpu_has_xsave) | |
364 | put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags); | |
365 | else | |
366 | put_user_ex(0, &frame->uc.uc_flags); | |
367 | put_user_ex(0, &frame->uc.uc_link); | |
368 | put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
369 | put_user_ex(sas_ss_flags(regs->sp), | |
370 | &frame->uc.uc_stack.ss_flags); | |
371 | put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
372 | err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate, | |
373 | regs, set->sig[0]); | |
374 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
375 | ||
376 | /* Set up to return from userspace. */ | |
377 | restorer = VDSO32_SYMBOL(current->mm->context.vdso, rt_sigreturn); | |
378 | if (ka->sa.sa_flags & SA_RESTORER) | |
379 | restorer = ka->sa.sa_restorer; | |
380 | put_user_ex(restorer, &frame->pretcode); | |
381 | ||
382 | /* | |
383 | * This is movl $__NR_rt_sigreturn, %ax ; int $0x80 | |
384 | * | |
385 | * WE DO NOT USE IT ANY MORE! It's only left here for historical | |
386 | * reasons and because gdb uses it as a signature to notice | |
387 | * signal handler stack frames. | |
388 | */ | |
389 | put_user_ex(*((u64 *)&rt_retcode), (u64 *)frame->retcode); | |
390 | } put_user_catch(err); | |
1da177e4 LT |
391 | |
392 | if (err) | |
3d0aedd9 | 393 | return -EFAULT; |
1da177e4 LT |
394 | |
395 | /* Set up registers for signal handler */ | |
7e907f48 IM |
396 | regs->sp = (unsigned long)frame; |
397 | regs->ip = (unsigned long)ka->sa.sa_handler; | |
13ad7725 | 398 | regs->ax = (unsigned long)sig; |
7e907f48 IM |
399 | regs->dx = (unsigned long)&frame->info; |
400 | regs->cx = (unsigned long)&frame->uc; | |
1da177e4 | 401 | |
65ea5b03 PA |
402 | regs->ds = __USER_DS; |
403 | regs->es = __USER_DS; | |
404 | regs->ss = __USER_DS; | |
405 | regs->cs = __USER_CS; | |
1da177e4 | 406 | |
283828f3 | 407 | return 0; |
1da177e4 | 408 | } |
bfeb91a9 | 409 | #else /* !CONFIG_X86_32 */ |
bfeb91a9 HS |
410 | static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
411 | sigset_t *set, struct pt_regs *regs) | |
412 | { | |
413 | struct rt_sigframe __user *frame; | |
414 | void __user *fp = NULL; | |
415 | int err = 0; | |
416 | struct task_struct *me = current; | |
417 | ||
97286a2b | 418 | frame = get_sigframe(ka, regs, sizeof(struct rt_sigframe), &fp); |
bfeb91a9 HS |
419 | |
420 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
421 | return -EFAULT; | |
422 | ||
423 | if (ka->sa.sa_flags & SA_SIGINFO) { | |
424 | if (copy_siginfo_to_user(&frame->info, info)) | |
425 | return -EFAULT; | |
426 | } | |
427 | ||
98e3d45e HS |
428 | put_user_try { |
429 | /* Create the ucontext. */ | |
430 | if (cpu_has_xsave) | |
431 | put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags); | |
432 | else | |
433 | put_user_ex(0, &frame->uc.uc_flags); | |
434 | put_user_ex(0, &frame->uc.uc_link); | |
435 | put_user_ex(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
436 | put_user_ex(sas_ss_flags(regs->sp), | |
437 | &frame->uc.uc_stack.ss_flags); | |
438 | put_user_ex(me->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
439 | err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]); | |
440 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
441 | ||
442 | /* Set up to return from userspace. If provided, use a stub | |
443 | already in userspace. */ | |
444 | /* x86-64 should always use SA_RESTORER. */ | |
445 | if (ka->sa.sa_flags & SA_RESTORER) { | |
446 | put_user_ex(ka->sa.sa_restorer, &frame->pretcode); | |
447 | } else { | |
448 | /* could use a vstub here */ | |
449 | err |= -EFAULT; | |
450 | } | |
451 | } put_user_catch(err); | |
bfeb91a9 HS |
452 | |
453 | if (err) | |
454 | return -EFAULT; | |
455 | ||
456 | /* Set up registers for signal handler */ | |
457 | regs->di = sig; | |
458 | /* In case the signal handler was declared without prototypes */ | |
459 | regs->ax = 0; | |
460 | ||
461 | /* This also works for non SA_SIGINFO handlers because they expect the | |
462 | next argument after the signal number on the stack. */ | |
463 | regs->si = (unsigned long)&frame->info; | |
464 | regs->dx = (unsigned long)&frame->uc; | |
465 | regs->ip = (unsigned long) ka->sa.sa_handler; | |
466 | ||
467 | regs->sp = (unsigned long)frame; | |
468 | ||
469 | /* Set up the CS register to run signal handlers in 64-bit mode, | |
470 | even if the handler happens to be interrupting 32-bit code. */ | |
471 | regs->cs = __USER_CS; | |
472 | ||
473 | return 0; | |
474 | } | |
475 | #endif /* CONFIG_X86_32 */ | |
476 | ||
e5fa2d06 | 477 | #ifdef CONFIG_X86_32 |
bfeb91a9 HS |
478 | /* |
479 | * Atomically swap in the new signal mask, and wait for a signal. | |
480 | */ | |
481 | asmlinkage int | |
482 | sys_sigsuspend(int history0, int history1, old_sigset_t mask) | |
483 | { | |
3982294b | 484 | sigset_t blocked; |
3982294b | 485 | siginitset(&blocked, mask); |
68f3f16d | 486 | return sigsuspend(&blocked); |
bfeb91a9 HS |
487 | } |
488 | ||
489 | asmlinkage int | |
490 | sys_sigaction(int sig, const struct old_sigaction __user *act, | |
491 | struct old_sigaction __user *oact) | |
492 | { | |
493 | struct k_sigaction new_ka, old_ka; | |
98e3d45e | 494 | int ret = 0; |
bfeb91a9 HS |
495 | |
496 | if (act) { | |
497 | old_sigset_t mask; | |
498 | ||
98e3d45e | 499 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) |
bfeb91a9 HS |
500 | return -EFAULT; |
501 | ||
98e3d45e HS |
502 | get_user_try { |
503 | get_user_ex(new_ka.sa.sa_handler, &act->sa_handler); | |
504 | get_user_ex(new_ka.sa.sa_flags, &act->sa_flags); | |
505 | get_user_ex(mask, &act->sa_mask); | |
506 | get_user_ex(new_ka.sa.sa_restorer, &act->sa_restorer); | |
507 | } get_user_catch(ret); | |
508 | ||
509 | if (ret) | |
510 | return -EFAULT; | |
bfeb91a9 HS |
511 | siginitset(&new_ka.sa.sa_mask, mask); |
512 | } | |
513 | ||
514 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
515 | ||
516 | if (!ret && oact) { | |
98e3d45e | 517 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) |
bfeb91a9 HS |
518 | return -EFAULT; |
519 | ||
98e3d45e HS |
520 | put_user_try { |
521 | put_user_ex(old_ka.sa.sa_handler, &oact->sa_handler); | |
522 | put_user_ex(old_ka.sa.sa_flags, &oact->sa_flags); | |
523 | put_user_ex(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); | |
524 | put_user_ex(old_ka.sa.sa_restorer, &oact->sa_restorer); | |
525 | } put_user_catch(ret); | |
526 | ||
527 | if (ret) | |
528 | return -EFAULT; | |
bfeb91a9 HS |
529 | } |
530 | ||
531 | return ret; | |
532 | } | |
e5fa2d06 | 533 | #endif /* CONFIG_X86_32 */ |
bfeb91a9 | 534 | |
052acad4 | 535 | long |
bfeb91a9 HS |
536 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, |
537 | struct pt_regs *regs) | |
538 | { | |
539 | return do_sigaltstack(uss, uoss, regs->sp); | |
540 | } | |
bfeb91a9 HS |
541 | |
542 | /* | |
543 | * Do a signal return; undo the signal stack. | |
544 | */ | |
e5fa2d06 | 545 | #ifdef CONFIG_X86_32 |
b12bdaf1 | 546 | unsigned long sys_sigreturn(struct pt_regs *regs) |
bfeb91a9 HS |
547 | { |
548 | struct sigframe __user *frame; | |
bfeb91a9 HS |
549 | unsigned long ax; |
550 | sigset_t set; | |
551 | ||
bfeb91a9 HS |
552 | frame = (struct sigframe __user *)(regs->sp - 8); |
553 | ||
554 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
555 | goto badframe; | |
556 | if (__get_user(set.sig[0], &frame->sc.oldmask) || (_NSIG_WORDS > 1 | |
557 | && __copy_from_user(&set.sig[1], &frame->extramask, | |
558 | sizeof(frame->extramask)))) | |
559 | goto badframe; | |
560 | ||
3982294b | 561 | set_current_blocked(&set); |
bfeb91a9 HS |
562 | |
563 | if (restore_sigcontext(regs, &frame->sc, &ax)) | |
564 | goto badframe; | |
565 | return ax; | |
566 | ||
567 | badframe: | |
ae417bb4 | 568 | signal_fault(regs, frame, "sigreturn"); |
bfeb91a9 HS |
569 | |
570 | return 0; | |
571 | } | |
e5fa2d06 | 572 | #endif /* CONFIG_X86_32 */ |
bfeb91a9 | 573 | |
74452509 | 574 | long sys_rt_sigreturn(struct pt_regs *regs) |
bfeb91a9 HS |
575 | { |
576 | struct rt_sigframe __user *frame; | |
577 | unsigned long ax; | |
578 | sigset_t set; | |
579 | ||
580 | frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long)); | |
581 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
582 | goto badframe; | |
583 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
584 | goto badframe; | |
585 | ||
e9bd3f0f | 586 | set_current_blocked(&set); |
bfeb91a9 HS |
587 | |
588 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax)) | |
589 | goto badframe; | |
590 | ||
591 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT) | |
592 | goto badframe; | |
593 | ||
594 | return ax; | |
595 | ||
596 | badframe: | |
597 | signal_fault(regs, frame, "rt_sigreturn"); | |
598 | return 0; | |
599 | } | |
600 | ||
1da177e4 | 601 | /* |
7e907f48 IM |
602 | * OK, we're invoking a handler: |
603 | */ | |
8d8c13bd HS |
604 | static int signr_convert(int sig) |
605 | { | |
96bf84b7 | 606 | #ifdef CONFIG_X86_32 |
8d8c13bd HS |
607 | struct thread_info *info = current_thread_info(); |
608 | ||
609 | if (info->exec_domain && info->exec_domain->signal_invmap && sig < 32) | |
610 | return info->exec_domain->signal_invmap[sig]; | |
96bf84b7 | 611 | #endif /* CONFIG_X86_32 */ |
8d8c13bd HS |
612 | return sig; |
613 | } | |
614 | ||
cabf5035 HS |
615 | #ifdef CONFIG_X86_32 |
616 | ||
455edbc4 | 617 | #define is_ia32 1 |
4694d239 HS |
618 | #define ia32_setup_frame __setup_frame |
619 | #define ia32_setup_rt_frame __setup_rt_frame | |
455edbc4 | 620 | |
cabf5035 HS |
621 | #else /* !CONFIG_X86_32 */ |
622 | ||
623 | #ifdef CONFIG_IA32_EMULATION | |
624 | #define is_ia32 test_thread_flag(TIF_IA32) | |
625 | #else /* !CONFIG_IA32_EMULATION */ | |
626 | #define is_ia32 0 | |
627 | #endif /* CONFIG_IA32_EMULATION */ | |
628 | ||
c5a37394 PA |
629 | #ifdef CONFIG_X86_X32_ABI |
630 | #define is_x32 test_thread_flag(TIF_X32) | |
631 | ||
632 | static int x32_setup_rt_frame(int sig, struct k_sigaction *ka, | |
633 | siginfo_t *info, compat_sigset_t *set, | |
634 | struct pt_regs *regs); | |
635 | #else /* !CONFIG_X86_X32_ABI */ | |
636 | #define is_x32 0 | |
637 | #endif /* CONFIG_X86_X32_ABI */ | |
638 | ||
f5223763 HS |
639 | int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
640 | sigset_t *set, struct pt_regs *regs); | |
641 | int ia32_setup_frame(int sig, struct k_sigaction *ka, | |
642 | sigset_t *set, struct pt_regs *regs); | |
643 | ||
cabf5035 HS |
644 | #endif /* CONFIG_X86_32 */ |
645 | ||
1d13024e HS |
646 | static int |
647 | setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, | |
9b429620 | 648 | struct pt_regs *regs) |
1d13024e | 649 | { |
8d8c13bd | 650 | int usig = signr_convert(sig); |
b7f9a11a | 651 | sigset_t *set = sigmask_to_save(); |
1d13024e HS |
652 | |
653 | /* Set up the stack frame */ | |
455edbc4 HS |
654 | if (is_ia32) { |
655 | if (ka->sa.sa_flags & SA_SIGINFO) | |
a610d6e6 | 656 | return ia32_setup_rt_frame(usig, ka, info, set, regs); |
455edbc4 | 657 | else |
a610d6e6 | 658 | return ia32_setup_frame(usig, ka, set, regs); |
c5a37394 PA |
659 | #ifdef CONFIG_X86_X32_ABI |
660 | } else if (is_x32) { | |
a610d6e6 | 661 | return x32_setup_rt_frame(usig, ka, info, |
c5a37394 PA |
662 | (compat_sigset_t *)set, regs); |
663 | #endif | |
664 | } else { | |
a610d6e6 | 665 | return __setup_rt_frame(sig, ka, info, set, regs); |
c5a37394 | 666 | } |
1d13024e HS |
667 | } |
668 | ||
a610d6e6 | 669 | static void |
1da177e4 | 670 | handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, |
9b429620 | 671 | struct pt_regs *regs) |
1da177e4 LT |
672 | { |
673 | /* Are we from a system call? */ | |
bb57925f | 674 | if (syscall_get_nr(current, regs) >= 0) { |
1da177e4 | 675 | /* If so, check system call restarting.. */ |
bb57925f | 676 | switch (syscall_get_error(current, regs)) { |
ac66f3fd HH |
677 | case -ERESTART_RESTARTBLOCK: |
678 | case -ERESTARTNOHAND: | |
679 | regs->ax = -EINTR; | |
680 | break; | |
681 | ||
682 | case -ERESTARTSYS: | |
683 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
65ea5b03 | 684 | regs->ax = -EINTR; |
1da177e4 | 685 | break; |
ac66f3fd HH |
686 | } |
687 | /* fallthrough */ | |
688 | case -ERESTARTNOINTR: | |
689 | regs->ax = regs->orig_ax; | |
690 | regs->ip -= 2; | |
691 | break; | |
1da177e4 LT |
692 | } |
693 | } | |
694 | ||
695 | /* | |
e1f28773 RM |
696 | * If TF is set due to a debugger (TIF_FORCED_TF), clear the TF |
697 | * flag so that register information in the sigcontext is correct. | |
1da177e4 | 698 | */ |
65ea5b03 | 699 | if (unlikely(regs->flags & X86_EFLAGS_TF) && |
e1f28773 | 700 | likely(test_and_clear_thread_flag(TIF_FORCED_TF))) |
65ea5b03 | 701 | regs->flags &= ~X86_EFLAGS_TF; |
1da177e4 | 702 | |
a610d6e6 AV |
703 | if (setup_rt_frame(sig, ka, info, regs) < 0) { |
704 | force_sigsegv(sig, current); | |
705 | return; | |
706 | } | |
7c1def16 | 707 | |
8b9c5ff3 RM |
708 | /* |
709 | * Clear the direction flag as per the ABI for function entry. | |
710 | */ | |
711 | regs->flags &= ~X86_EFLAGS_DF; | |
712 | ||
713 | /* | |
714 | * Clear TF when entering the signal handler, but | |
715 | * notify any tracer that was single-stepping it. | |
716 | * The tracer may want to single-step inside the | |
717 | * handler too. | |
718 | */ | |
719 | regs->flags &= ~X86_EFLAGS_TF; | |
8b9c5ff3 | 720 | |
efee984c AV |
721 | signal_delivered(sig, info, ka, regs, |
722 | test_thread_flag(TIF_SINGLESTEP)); | |
1da177e4 LT |
723 | } |
724 | ||
57917752 | 725 | #ifdef CONFIG_X86_32 |
8fcd8e20 | 726 | #define NR_restart_syscall __NR_restart_syscall |
57917752 HS |
727 | #else /* !CONFIG_X86_32 */ |
728 | #define NR_restart_syscall \ | |
729 | test_thread_flag(TIF_IA32) ? __NR_ia32_restart_syscall : __NR_restart_syscall | |
730 | #endif /* CONFIG_X86_32 */ | |
731 | ||
1da177e4 LT |
732 | /* |
733 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
734 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
735 | * mistake. | |
736 | */ | |
75604d7f | 737 | static void do_signal(struct pt_regs *regs) |
1da177e4 | 738 | { |
ac66f3fd | 739 | struct k_sigaction ka; |
1da177e4 LT |
740 | siginfo_t info; |
741 | int signr; | |
1da177e4 | 742 | |
1da177e4 LT |
743 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
744 | if (signr > 0) { | |
7e907f48 | 745 | /* Whee! Actually deliver the signal. */ |
9b429620 | 746 | handle_signal(signr, &info, &ka, regs); |
283828f3 | 747 | return; |
1da177e4 LT |
748 | } |
749 | ||
1da177e4 | 750 | /* Did we come from a system call? */ |
bb57925f | 751 | if (syscall_get_nr(current, regs) >= 0) { |
1da177e4 | 752 | /* Restart the system call - no handlers present */ |
bb57925f | 753 | switch (syscall_get_error(current, regs)) { |
283828f3 DH |
754 | case -ERESTARTNOHAND: |
755 | case -ERESTARTSYS: | |
756 | case -ERESTARTNOINTR: | |
65ea5b03 PA |
757 | regs->ax = regs->orig_ax; |
758 | regs->ip -= 2; | |
283828f3 DH |
759 | break; |
760 | ||
761 | case -ERESTART_RESTARTBLOCK: | |
8fcd8e20 | 762 | regs->ax = NR_restart_syscall; |
65ea5b03 | 763 | regs->ip -= 2; |
283828f3 | 764 | break; |
1da177e4 LT |
765 | } |
766 | } | |
283828f3 | 767 | |
ac66f3fd HH |
768 | /* |
769 | * If there's no signal to deliver, we just put the saved sigmask | |
770 | * back. | |
771 | */ | |
51a7b448 | 772 | restore_saved_sigmask(); |
1da177e4 LT |
773 | } |
774 | ||
775 | /* | |
776 | * notification of userspace execution resumption | |
283828f3 | 777 | * - triggered by the TIF_WORK_MASK flags |
1da177e4 | 778 | */ |
7e907f48 IM |
779 | void |
780 | do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags) | |
1da177e4 | 781 | { |
c1ebf835 | 782 | #ifdef CONFIG_X86_MCE |
ee847c54 HS |
783 | /* notify userspace of pending MCEs */ |
784 | if (thread_info_flags & _TIF_MCE_NOTIFY) | |
9b1beaf2 | 785 | mce_notify_process(); |
ee847c54 HS |
786 | #endif /* CONFIG_X86_64 && CONFIG_X86_MCE */ |
787 | ||
0326f5a9 SD |
788 | if (thread_info_flags & _TIF_UPROBE) { |
789 | clear_thread_flag(TIF_UPROBE); | |
790 | uprobe_notify_resume(regs); | |
791 | } | |
792 | ||
1da177e4 | 793 | /* deal with pending signal delivery */ |
5a8da0ea | 794 | if (thread_info_flags & _TIF_SIGPENDING) |
283828f3 | 795 | do_signal(regs); |
8f4d37ec | 796 | |
59e52130 RM |
797 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { |
798 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
799 | tracehook_notify_resume(regs); | |
800 | } | |
7c68af6e AK |
801 | if (thread_info_flags & _TIF_USER_RETURN_NOTIFY) |
802 | fire_user_return_notifiers(); | |
59e52130 | 803 | |
ee847c54 | 804 | #ifdef CONFIG_X86_32 |
1da177e4 | 805 | clear_thread_flag(TIF_IRET); |
ee847c54 | 806 | #endif /* CONFIG_X86_32 */ |
1da177e4 | 807 | } |
72fa50f4 HS |
808 | |
809 | void signal_fault(struct pt_regs *regs, void __user *frame, char *where) | |
810 | { | |
811 | struct task_struct *me = current; | |
812 | ||
813 | if (show_unhandled_signals && printk_ratelimit()) { | |
ae417bb4 | 814 | printk("%s" |
72fa50f4 | 815 | "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx", |
ae417bb4 | 816 | task_pid_nr(current) > 1 ? KERN_INFO : KERN_EMERG, |
72fa50f4 HS |
817 | me->comm, me->pid, where, frame, |
818 | regs->ip, regs->sp, regs->orig_ax); | |
819 | print_vma_addr(" in ", regs->ip); | |
c767a54b | 820 | pr_cont("\n"); |
72fa50f4 HS |
821 | } |
822 | ||
823 | force_sig(SIGSEGV, me); | |
824 | } | |
c5a37394 PA |
825 | |
826 | #ifdef CONFIG_X86_X32_ABI | |
827 | static int x32_setup_rt_frame(int sig, struct k_sigaction *ka, | |
828 | siginfo_t *info, compat_sigset_t *set, | |
829 | struct pt_regs *regs) | |
830 | { | |
831 | struct rt_sigframe_x32 __user *frame; | |
832 | void __user *restorer; | |
833 | int err = 0; | |
834 | void __user *fpstate = NULL; | |
835 | ||
836 | frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate); | |
837 | ||
838 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
839 | return -EFAULT; | |
840 | ||
841 | if (ka->sa.sa_flags & SA_SIGINFO) { | |
842 | if (copy_siginfo_to_user32(&frame->info, info)) | |
843 | return -EFAULT; | |
844 | } | |
845 | ||
846 | put_user_try { | |
847 | /* Create the ucontext. */ | |
848 | if (cpu_has_xsave) | |
849 | put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags); | |
850 | else | |
851 | put_user_ex(0, &frame->uc.uc_flags); | |
852 | put_user_ex(0, &frame->uc.uc_link); | |
853 | put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
854 | put_user_ex(sas_ss_flags(regs->sp), | |
855 | &frame->uc.uc_stack.ss_flags); | |
856 | put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
857 | put_user_ex(0, &frame->uc.uc__pad0); | |
858 | err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate, | |
859 | regs, set->sig[0]); | |
860 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
861 | ||
862 | if (ka->sa.sa_flags & SA_RESTORER) { | |
863 | restorer = ka->sa.sa_restorer; | |
864 | } else { | |
865 | /* could use a vstub here */ | |
866 | restorer = NULL; | |
867 | err |= -EFAULT; | |
868 | } | |
869 | put_user_ex(restorer, &frame->pretcode); | |
870 | } put_user_catch(err); | |
871 | ||
872 | if (err) | |
873 | return -EFAULT; | |
874 | ||
875 | /* Set up registers for signal handler */ | |
876 | regs->sp = (unsigned long) frame; | |
877 | regs->ip = (unsigned long) ka->sa.sa_handler; | |
878 | ||
879 | /* We use the x32 calling convention here... */ | |
880 | regs->di = sig; | |
881 | regs->si = (unsigned long) &frame->info; | |
882 | regs->dx = (unsigned long) &frame->uc; | |
883 | ||
884 | loadsegment(ds, __USER_DS); | |
885 | loadsegment(es, __USER_DS); | |
886 | ||
887 | regs->cs = __USER_CS; | |
888 | regs->ss = __USER_DS; | |
889 | ||
890 | return 0; | |
891 | } | |
892 | ||
893 | asmlinkage long sys32_x32_rt_sigreturn(struct pt_regs *regs) | |
894 | { | |
895 | struct rt_sigframe_x32 __user *frame; | |
896 | sigset_t set; | |
897 | unsigned long ax; | |
898 | struct pt_regs tregs; | |
899 | ||
900 | frame = (struct rt_sigframe_x32 __user *)(regs->sp - 8); | |
901 | ||
902 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
903 | goto badframe; | |
904 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
905 | goto badframe; | |
906 | ||
c5a37394 PA |
907 | set_current_blocked(&set); |
908 | ||
909 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax)) | |
910 | goto badframe; | |
911 | ||
912 | tregs = *regs; | |
913 | if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, &tregs) == -EFAULT) | |
914 | goto badframe; | |
915 | ||
916 | return ax; | |
917 | ||
918 | badframe: | |
919 | signal_fault(regs, frame, "x32 rt_sigreturn"); | |
920 | return 0; | |
921 | } | |
922 | #endif |