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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_SIGNAL_H |
3 | #define _LINUX_SIGNAL_H | |
4 | ||
1c3bea0e | 5 | #include <linux/bug.h> |
e6d930b4 | 6 | #include <linux/signal_types.h> |
7994200c | 7 | #include <linux/string.h> |
1da177e4 | 8 | |
1477fcc2 SR |
9 | struct task_struct; |
10 | ||
d33ed52d DY |
11 | /* for sysctl */ |
12 | extern int print_fatal_signals; | |
1da177e4 | 13 | |
ae7795bc EB |
14 | static inline void copy_siginfo(kernel_siginfo_t *to, |
15 | const kernel_siginfo_t *from) | |
ca9eb49a | 16 | { |
8c36fdf5 | 17 | memcpy(to, from, sizeof(*to)); |
ca9eb49a JH |
18 | } |
19 | ||
ae7795bc | 20 | static inline void clear_siginfo(kernel_siginfo_t *info) |
8c5dbf2a EB |
21 | { |
22 | memset(info, 0, sizeof(*info)); | |
23 | } | |
24 | ||
4ce5f9c9 EB |
25 | #define SI_EXPANSION_SIZE (sizeof(struct siginfo) - sizeof(struct kernel_siginfo)) |
26 | ||
fa4751f4 EB |
27 | static inline void copy_siginfo_to_external(siginfo_t *to, |
28 | const kernel_siginfo_t *from) | |
29 | { | |
30 | memcpy(to, from, sizeof(*from)); | |
31 | memset(((char *)to) + sizeof(struct kernel_siginfo), 0, | |
32 | SI_EXPANSION_SIZE); | |
33 | } | |
34 | ||
ae7795bc EB |
35 | int copy_siginfo_to_user(siginfo_t __user *to, const kernel_siginfo_t *from); |
36 | int copy_siginfo_from_user(kernel_siginfo_t *to, const siginfo_t __user *from); | |
b9253a43 | 37 | |
cc731525 EB |
38 | enum siginfo_layout { |
39 | SIL_KILL, | |
40 | SIL_TIMER, | |
41 | SIL_POLL, | |
42 | SIL_FAULT, | |
31931c93 EB |
43 | SIL_FAULT_MCEERR, |
44 | SIL_FAULT_BNDERR, | |
45 | SIL_FAULT_PKUERR, | |
cc731525 EB |
46 | SIL_CHLD, |
47 | SIL_RT, | |
cc731525 | 48 | SIL_SYS, |
cc731525 EB |
49 | }; |
50 | ||
a3670058 | 51 | enum siginfo_layout siginfo_layout(unsigned sig, int si_code); |
cc731525 | 52 | |
1da177e4 LT |
53 | /* |
54 | * Define some primitives to manipulate sigset_t. | |
55 | */ | |
56 | ||
57 | #ifndef __HAVE_ARCH_SIG_BITOPS | |
58 | #include <linux/bitops.h> | |
59 | ||
60 | /* We don't use <linux/bitops.h> for these because there is no need to | |
61 | be atomic. */ | |
62 | static inline void sigaddset(sigset_t *set, int _sig) | |
63 | { | |
64 | unsigned long sig = _sig - 1; | |
65 | if (_NSIG_WORDS == 1) | |
66 | set->sig[0] |= 1UL << sig; | |
67 | else | |
68 | set->sig[sig / _NSIG_BPW] |= 1UL << (sig % _NSIG_BPW); | |
69 | } | |
70 | ||
71 | static inline void sigdelset(sigset_t *set, int _sig) | |
72 | { | |
73 | unsigned long sig = _sig - 1; | |
74 | if (_NSIG_WORDS == 1) | |
75 | set->sig[0] &= ~(1UL << sig); | |
76 | else | |
77 | set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW)); | |
78 | } | |
79 | ||
80 | static inline int sigismember(sigset_t *set, int _sig) | |
81 | { | |
82 | unsigned long sig = _sig - 1; | |
83 | if (_NSIG_WORDS == 1) | |
84 | return 1 & (set->sig[0] >> sig); | |
85 | else | |
86 | return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW)); | |
87 | } | |
88 | ||
1da177e4 LT |
89 | #endif /* __HAVE_ARCH_SIG_BITOPS */ |
90 | ||
71fabd5e GA |
91 | static inline int sigisemptyset(sigset_t *set) |
92 | { | |
71fabd5e GA |
93 | switch (_NSIG_WORDS) { |
94 | case 4: | |
95 | return (set->sig[3] | set->sig[2] | | |
96 | set->sig[1] | set->sig[0]) == 0; | |
97 | case 2: | |
98 | return (set->sig[1] | set->sig[0]) == 0; | |
99 | case 1: | |
100 | return set->sig[0] == 0; | |
101 | default: | |
1c3bea0e | 102 | BUILD_BUG(); |
71fabd5e GA |
103 | return 0; |
104 | } | |
105 | } | |
106 | ||
c7be96af WL |
107 | static inline int sigequalsets(const sigset_t *set1, const sigset_t *set2) |
108 | { | |
109 | switch (_NSIG_WORDS) { | |
110 | case 4: | |
111 | return (set1->sig[3] == set2->sig[3]) && | |
112 | (set1->sig[2] == set2->sig[2]) && | |
113 | (set1->sig[1] == set2->sig[1]) && | |
114 | (set1->sig[0] == set2->sig[0]); | |
115 | case 2: | |
116 | return (set1->sig[1] == set2->sig[1]) && | |
117 | (set1->sig[0] == set2->sig[0]); | |
118 | case 1: | |
119 | return set1->sig[0] == set2->sig[0]; | |
120 | } | |
121 | return 0; | |
122 | } | |
123 | ||
1da177e4 LT |
124 | #define sigmask(sig) (1UL << ((sig) - 1)) |
125 | ||
126 | #ifndef __HAVE_ARCH_SIG_SETOPS | |
127 | #include <linux/string.h> | |
128 | ||
129 | #define _SIG_SET_BINOP(name, op) \ | |
130 | static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \ | |
131 | { \ | |
1da177e4 LT |
132 | unsigned long a0, a1, a2, a3, b0, b1, b2, b3; \ |
133 | \ | |
134 | switch (_NSIG_WORDS) { \ | |
1c3bea0e | 135 | case 4: \ |
1da177e4 LT |
136 | a3 = a->sig[3]; a2 = a->sig[2]; \ |
137 | b3 = b->sig[3]; b2 = b->sig[2]; \ | |
138 | r->sig[3] = op(a3, b3); \ | |
139 | r->sig[2] = op(a2, b2); \ | |
df561f66 | 140 | fallthrough; \ |
1c3bea0e | 141 | case 2: \ |
1da177e4 LT |
142 | a1 = a->sig[1]; b1 = b->sig[1]; \ |
143 | r->sig[1] = op(a1, b1); \ | |
df561f66 | 144 | fallthrough; \ |
1c3bea0e | 145 | case 1: \ |
1da177e4 LT |
146 | a0 = a->sig[0]; b0 = b->sig[0]; \ |
147 | r->sig[0] = op(a0, b0); \ | |
148 | break; \ | |
1c3bea0e ON |
149 | default: \ |
150 | BUILD_BUG(); \ | |
1da177e4 LT |
151 | } \ |
152 | } | |
153 | ||
154 | #define _sig_or(x,y) ((x) | (y)) | |
155 | _SIG_SET_BINOP(sigorsets, _sig_or) | |
156 | ||
157 | #define _sig_and(x,y) ((x) & (y)) | |
158 | _SIG_SET_BINOP(sigandsets, _sig_and) | |
159 | ||
702a5073 ON |
160 | #define _sig_andn(x,y) ((x) & ~(y)) |
161 | _SIG_SET_BINOP(sigandnsets, _sig_andn) | |
1da177e4 LT |
162 | |
163 | #undef _SIG_SET_BINOP | |
164 | #undef _sig_or | |
165 | #undef _sig_and | |
702a5073 | 166 | #undef _sig_andn |
1da177e4 LT |
167 | |
168 | #define _SIG_SET_OP(name, op) \ | |
169 | static inline void name(sigset_t *set) \ | |
170 | { \ | |
1da177e4 | 171 | switch (_NSIG_WORDS) { \ |
1c3bea0e ON |
172 | case 4: set->sig[3] = op(set->sig[3]); \ |
173 | set->sig[2] = op(set->sig[2]); \ | |
df561f66 | 174 | fallthrough; \ |
1c3bea0e | 175 | case 2: set->sig[1] = op(set->sig[1]); \ |
df561f66 | 176 | fallthrough; \ |
1c3bea0e | 177 | case 1: set->sig[0] = op(set->sig[0]); \ |
1da177e4 | 178 | break; \ |
1c3bea0e ON |
179 | default: \ |
180 | BUILD_BUG(); \ | |
1da177e4 LT |
181 | } \ |
182 | } | |
183 | ||
184 | #define _sig_not(x) (~(x)) | |
185 | _SIG_SET_OP(signotset, _sig_not) | |
186 | ||
187 | #undef _SIG_SET_OP | |
188 | #undef _sig_not | |
189 | ||
190 | static inline void sigemptyset(sigset_t *set) | |
191 | { | |
192 | switch (_NSIG_WORDS) { | |
193 | default: | |
194 | memset(set, 0, sizeof(sigset_t)); | |
195 | break; | |
196 | case 2: set->sig[1] = 0; | |
df561f66 | 197 | fallthrough; |
1da177e4 LT |
198 | case 1: set->sig[0] = 0; |
199 | break; | |
200 | } | |
201 | } | |
202 | ||
203 | static inline void sigfillset(sigset_t *set) | |
204 | { | |
205 | switch (_NSIG_WORDS) { | |
206 | default: | |
207 | memset(set, -1, sizeof(sigset_t)); | |
208 | break; | |
209 | case 2: set->sig[1] = -1; | |
df561f66 | 210 | fallthrough; |
1da177e4 LT |
211 | case 1: set->sig[0] = -1; |
212 | break; | |
213 | } | |
214 | } | |
215 | ||
216 | /* Some extensions for manipulating the low 32 signals in particular. */ | |
217 | ||
218 | static inline void sigaddsetmask(sigset_t *set, unsigned long mask) | |
219 | { | |
220 | set->sig[0] |= mask; | |
221 | } | |
222 | ||
223 | static inline void sigdelsetmask(sigset_t *set, unsigned long mask) | |
224 | { | |
225 | set->sig[0] &= ~mask; | |
226 | } | |
227 | ||
228 | static inline int sigtestsetmask(sigset_t *set, unsigned long mask) | |
229 | { | |
230 | return (set->sig[0] & mask) != 0; | |
231 | } | |
232 | ||
233 | static inline void siginitset(sigset_t *set, unsigned long mask) | |
234 | { | |
235 | set->sig[0] = mask; | |
236 | switch (_NSIG_WORDS) { | |
237 | default: | |
238 | memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1)); | |
239 | break; | |
240 | case 2: set->sig[1] = 0; | |
241 | case 1: ; | |
242 | } | |
243 | } | |
244 | ||
245 | static inline void siginitsetinv(sigset_t *set, unsigned long mask) | |
246 | { | |
247 | set->sig[0] = ~mask; | |
248 | switch (_NSIG_WORDS) { | |
249 | default: | |
250 | memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1)); | |
251 | break; | |
252 | case 2: set->sig[1] = -1; | |
253 | case 1: ; | |
254 | } | |
255 | } | |
256 | ||
257 | #endif /* __HAVE_ARCH_SIG_SETOPS */ | |
258 | ||
259 | static inline void init_sigpending(struct sigpending *sig) | |
260 | { | |
261 | sigemptyset(&sig->signal); | |
262 | INIT_LIST_HEAD(&sig->list); | |
263 | } | |
264 | ||
6a14c5c9 ON |
265 | extern void flush_sigqueue(struct sigpending *queue); |
266 | ||
e5bdd883 JJ |
267 | /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */ |
268 | static inline int valid_signal(unsigned long sig) | |
269 | { | |
270 | return sig <= _NSIG ? 1 : 0; | |
271 | } | |
272 | ||
b2b07e4f ON |
273 | struct timespec; |
274 | struct pt_regs; | |
01024980 | 275 | enum pid_type; |
b2b07e4f | 276 | |
fba2afaa | 277 | extern int next_signal(struct sigpending *pending, sigset_t *mask); |
ae7795bc | 278 | extern int do_send_sig_info(int sig, struct kernel_siginfo *info, |
40b3b025 | 279 | struct task_struct *p, enum pid_type type); |
ae7795bc | 280 | extern int group_send_sig_info(int sig, struct kernel_siginfo *info, |
01024980 | 281 | struct task_struct *p, enum pid_type type); |
ae7795bc | 282 | extern int __group_send_sig_info(int, struct kernel_siginfo *, struct task_struct *); |
1da177e4 | 283 | extern int sigprocmask(int, sigset_t *, sigset_t *); |
77097ae5 AV |
284 | extern void set_current_blocked(sigset_t *); |
285 | extern void __set_current_blocked(const sigset_t *); | |
abd4f750 | 286 | extern int show_unhandled_signals; |
1da177e4 | 287 | |
20ab7218 | 288 | extern bool get_signal(struct ksignal *ksig); |
2ce5da17 | 289 | extern void signal_setup_done(int failed, struct ksignal *ksig, int stepping); |
d12619b5 | 290 | extern void exit_signals(struct task_struct *tsk); |
b4e74264 ON |
291 | extern void kernel_sigaction(int, __sighandler_t); |
292 | ||
33da8e7c EB |
293 | #define SIG_KTHREAD ((__force __sighandler_t)2) |
294 | #define SIG_KTHREAD_KERNEL ((__force __sighandler_t)3) | |
295 | ||
b4e74264 ON |
296 | static inline void allow_signal(int sig) |
297 | { | |
298 | /* | |
299 | * Kernel threads handle their own signals. Let the signal code | |
300 | * know it'll be handled, so that they don't get converted to | |
301 | * SIGKILL or just silently dropped. | |
302 | */ | |
33da8e7c EB |
303 | kernel_sigaction(sig, SIG_KTHREAD); |
304 | } | |
305 | ||
306 | static inline void allow_kernel_signal(int sig) | |
307 | { | |
308 | /* | |
309 | * Kernel threads handle their own signals. Let the signal code | |
310 | * know signals sent by the kernel will be handled, so that they | |
311 | * don't get silently dropped. | |
312 | */ | |
313 | kernel_sigaction(sig, SIG_KTHREAD_KERNEL); | |
b4e74264 ON |
314 | } |
315 | ||
316 | static inline void disallow_signal(int sig) | |
317 | { | |
318 | kernel_sigaction(sig, SIG_IGN); | |
319 | } | |
1da177e4 | 320 | |
298ec1e2 CL |
321 | extern struct kmem_cache *sighand_cachep; |
322 | ||
67a48a24 | 323 | extern bool unhandled_signal(struct task_struct *tsk, int sig); |
abd4f750 | 324 | |
55c0d1f8 RM |
325 | /* |
326 | * In POSIX a signal is sent either to a specific thread (Linux task) | |
327 | * or to the process as a whole (Linux thread group). How the signal | |
328 | * is sent determines whether it's to one thread or the whole group, | |
329 | * which determines which signal mask(s) are involved in blocking it | |
330 | * from being delivered until later. When the signal is delivered, | |
331 | * either it's caught or ignored by a user handler or it has a default | |
332 | * effect that applies to the whole thread group (POSIX process). | |
333 | * | |
334 | * The possible effects an unblocked signal set to SIG_DFL can have are: | |
335 | * ignore - Nothing Happens | |
336 | * terminate - kill the process, i.e. all threads in the group, | |
337 | * similar to exit_group. The group leader (only) reports | |
338 | * WIFSIGNALED status to its parent. | |
339 | * coredump - write a core dump file describing all threads using | |
340 | * the same mm and then kill all those threads | |
341 | * stop - stop all the threads in the group, i.e. TASK_STOPPED state | |
342 | * | |
343 | * SIGKILL and SIGSTOP cannot be caught, blocked, or ignored. | |
344 | * Other signals when not blocked and set to SIG_DFL behaves as follows. | |
345 | * The job control signals also have other special effects. | |
346 | * | |
347 | * +--------------------+------------------+ | |
348 | * | POSIX signal | default action | | |
349 | * +--------------------+------------------+ | |
350 | * | SIGHUP | terminate | | |
351 | * | SIGINT | terminate | | |
352 | * | SIGQUIT | coredump | | |
353 | * | SIGILL | coredump | | |
354 | * | SIGTRAP | coredump | | |
355 | * | SIGABRT/SIGIOT | coredump | | |
356 | * | SIGBUS | coredump | | |
357 | * | SIGFPE | coredump | | |
358 | * | SIGKILL | terminate(+) | | |
359 | * | SIGUSR1 | terminate | | |
360 | * | SIGSEGV | coredump | | |
361 | * | SIGUSR2 | terminate | | |
362 | * | SIGPIPE | terminate | | |
363 | * | SIGALRM | terminate | | |
364 | * | SIGTERM | terminate | | |
365 | * | SIGCHLD | ignore | | |
366 | * | SIGCONT | ignore(*) | | |
367 | * | SIGSTOP | stop(*)(+) | | |
368 | * | SIGTSTP | stop(*) | | |
369 | * | SIGTTIN | stop(*) | | |
370 | * | SIGTTOU | stop(*) | | |
371 | * | SIGURG | ignore | | |
372 | * | SIGXCPU | coredump | | |
373 | * | SIGXFSZ | coredump | | |
374 | * | SIGVTALRM | terminate | | |
375 | * | SIGPROF | terminate | | |
376 | * | SIGPOLL/SIGIO | terminate | | |
377 | * | SIGSYS/SIGUNUSED | coredump | | |
378 | * | SIGSTKFLT | terminate | | |
379 | * | SIGWINCH | ignore | | |
380 | * | SIGPWR | terminate | | |
381 | * | SIGRTMIN-SIGRTMAX | terminate | | |
382 | * +--------------------+------------------+ | |
383 | * | non-POSIX signal | default action | | |
384 | * +--------------------+------------------+ | |
385 | * | SIGEMT | coredump | | |
386 | * +--------------------+------------------+ | |
387 | * | |
388 | * (+) For SIGKILL and SIGSTOP the action is "always", not just "default". | |
389 | * (*) Special job control effects: | |
390 | * When SIGCONT is sent, it resumes the process (all threads in the group) | |
391 | * from TASK_STOPPED state and also clears any pending/queued stop signals | |
392 | * (any of those marked with "stop(*)"). This happens regardless of blocking, | |
393 | * catching, or ignoring SIGCONT. When any stop signal is sent, it clears | |
394 | * any pending/queued SIGCONT signals; this happens regardless of blocking, | |
395 | * catching, or ignored the stop signal, though (except for SIGSTOP) the | |
396 | * default action of stopping the process may happen later or never. | |
397 | */ | |
398 | ||
399 | #ifdef SIGEMT | |
400 | #define SIGEMT_MASK rt_sigmask(SIGEMT) | |
401 | #else | |
402 | #define SIGEMT_MASK 0 | |
403 | #endif | |
404 | ||
405 | #if SIGRTMIN > BITS_PER_LONG | |
406 | #define rt_sigmask(sig) (1ULL << ((sig)-1)) | |
407 | #else | |
408 | #define rt_sigmask(sig) sigmask(sig) | |
409 | #endif | |
5c8ccefd ON |
410 | |
411 | #define siginmask(sig, mask) \ | |
ee17e5d6 | 412 | ((sig) > 0 && (sig) < SIGRTMIN && (rt_sigmask(sig) & (mask))) |
55c0d1f8 RM |
413 | |
414 | #define SIG_KERNEL_ONLY_MASK (\ | |
415 | rt_sigmask(SIGKILL) | rt_sigmask(SIGSTOP)) | |
416 | ||
417 | #define SIG_KERNEL_STOP_MASK (\ | |
418 | rt_sigmask(SIGSTOP) | rt_sigmask(SIGTSTP) | \ | |
419 | rt_sigmask(SIGTTIN) | rt_sigmask(SIGTTOU) ) | |
420 | ||
421 | #define SIG_KERNEL_COREDUMP_MASK (\ | |
422 | rt_sigmask(SIGQUIT) | rt_sigmask(SIGILL) | \ | |
423 | rt_sigmask(SIGTRAP) | rt_sigmask(SIGABRT) | \ | |
424 | rt_sigmask(SIGFPE) | rt_sigmask(SIGSEGV) | \ | |
425 | rt_sigmask(SIGBUS) | rt_sigmask(SIGSYS) | \ | |
426 | rt_sigmask(SIGXCPU) | rt_sigmask(SIGXFSZ) | \ | |
427 | SIGEMT_MASK ) | |
428 | ||
429 | #define SIG_KERNEL_IGNORE_MASK (\ | |
430 | rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \ | |
431 | rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) ) | |
432 | ||
d08477aa EB |
433 | #define SIG_SPECIFIC_SICODES_MASK (\ |
434 | rt_sigmask(SIGILL) | rt_sigmask(SIGFPE) | \ | |
435 | rt_sigmask(SIGSEGV) | rt_sigmask(SIGBUS) | \ | |
436 | rt_sigmask(SIGTRAP) | rt_sigmask(SIGCHLD) | \ | |
437 | rt_sigmask(SIGPOLL) | rt_sigmask(SIGSYS) | \ | |
438 | SIGEMT_MASK ) | |
439 | ||
5c8ccefd ON |
440 | #define sig_kernel_only(sig) siginmask(sig, SIG_KERNEL_ONLY_MASK) |
441 | #define sig_kernel_coredump(sig) siginmask(sig, SIG_KERNEL_COREDUMP_MASK) | |
442 | #define sig_kernel_ignore(sig) siginmask(sig, SIG_KERNEL_IGNORE_MASK) | |
443 | #define sig_kernel_stop(sig) siginmask(sig, SIG_KERNEL_STOP_MASK) | |
d08477aa | 444 | #define sig_specific_sicodes(sig) siginmask(sig, SIG_SPECIFIC_SICODES_MASK) |
55c0d1f8 | 445 | |
55c0d1f8 RM |
446 | #define sig_fatal(t, signr) \ |
447 | (!siginmask(signr, SIG_KERNEL_IGNORE_MASK|SIG_KERNEL_STOP_MASK) && \ | |
448 | (t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL) | |
449 | ||
a1c9eea9 AB |
450 | void signals_init(void); |
451 | ||
5c49574f | 452 | int restore_altstack(const stack_t __user *); |
c40702c4 | 453 | int __save_altstack(stack_t __user *, unsigned long); |
5c49574f | 454 | |
119cd59f | 455 | #define unsafe_save_altstack(uss, sp, label) do { \ |
bd1c149a AV |
456 | stack_t __user *__uss = uss; \ |
457 | struct task_struct *t = current; \ | |
119cd59f AV |
458 | unsafe_put_user((void __user *)t->sas_ss_sp, &__uss->ss_sp, label); \ |
459 | unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \ | |
460 | unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \ | |
2a742138 SS |
461 | if (t->sas_ss_flags & SS_AUTODISARM) \ |
462 | sas_ss_reset(t); \ | |
bd1c149a AV |
463 | } while (0); |
464 | ||
34db8aaf DH |
465 | #ifdef CONFIG_PROC_FS |
466 | struct seq_file; | |
467 | extern void render_sigset_t(struct seq_file *, const char *, sigset_t *); | |
468 | #endif | |
469 | ||
1da177e4 | 470 | #endif /* _LINUX_SIGNAL_H */ |