1 /*-
2 * Copyright (c) 1994-1995 Søren Schmidt
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer
10 * in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software withough specific prior written permission
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/lock.h>
34 #include <sys/proc.h>
35 #include <sys/signalvar.h>
36 #include <sys/sysproto.h>
37
38 #include <machine/../linux/linux.h>
39 #include <machine/../linux/linux_proto.h>
40 #include <compat/linux/linux_signal.h>
41 #include <compat/linux/linux_util.h>
42
43 void
44 linux_to_bsd_sigset(l_sigset_t *lss, sigset_t *bss)
45 {
46 int b, l;
47
48 SIGEMPTYSET(*bss);
49 bss->__bits[0] = lss->__bits[0] & ~((1U << LINUX_SIGTBLSZ) - 1);
50 bss->__bits[1] = lss->__bits[1];
51 for (l = 1; l <= LINUX_SIGTBLSZ; l++) {
52 if (LINUX_SIGISMEMBER(*lss, l)) {
53 #ifdef __alpha__
54 b = _SIG_IDX(l);
55 #else
56 b = linux_to_bsd_signal[_SIG_IDX(l)];
57 #endif
58 if (b)
59 SIGADDSET(*bss, b);
60 }
61 }
62 }
63
64 void
65 bsd_to_linux_sigset(sigset_t *bss, l_sigset_t *lss)
66 {
67 int b, l;
68
69 LINUX_SIGEMPTYSET(*lss);
70 lss->__bits[0] = bss->__bits[0] & ~((1U << LINUX_SIGTBLSZ) - 1);
71 lss->__bits[1] = bss->__bits[1];
72 for (b = 1; b <= LINUX_SIGTBLSZ; b++) {
73 if (SIGISMEMBER(*bss, b)) {
74 #if __alpha__
75 l = _SIG_IDX(b);
76 #else
77 l = bsd_to_linux_signal[_SIG_IDX(b)];
78 #endif
79 if (l)
80 LINUX_SIGADDSET(*lss, l);
81 }
82 }
83 }
84
85 static void
86 linux_to_bsd_sigaction(l_sigaction_t *lsa, struct sigaction *bsa)
87 {
88
89 linux_to_bsd_sigset(&lsa->lsa_mask, &bsa->sa_mask);
90 bsa->sa_handler = lsa->lsa_handler;
91 bsa->sa_flags = 0;
92 if (lsa->lsa_flags & LINUX_SA_NOCLDSTOP)
93 bsa->sa_flags |= SA_NOCLDSTOP;
94 if (lsa->lsa_flags & LINUX_SA_NOCLDWAIT)
95 bsa->sa_flags |= SA_NOCLDWAIT;
96 if (lsa->lsa_flags & LINUX_SA_SIGINFO)
97 bsa->sa_flags |= SA_SIGINFO;
98 if (lsa->lsa_flags & LINUX_SA_ONSTACK)
99 bsa->sa_flags |= SA_ONSTACK;
100 if (lsa->lsa_flags & LINUX_SA_RESTART)
101 bsa->sa_flags |= SA_RESTART;
102 if (lsa->lsa_flags & LINUX_SA_ONESHOT)
103 bsa->sa_flags |= SA_RESETHAND;
104 if (lsa->lsa_flags & LINUX_SA_NOMASK)
105 bsa->sa_flags |= SA_NODEFER;
106 }
107
108 static void
109 bsd_to_linux_sigaction(struct sigaction *bsa, l_sigaction_t *lsa)
110 {
111
112 bsd_to_linux_sigset(&bsa->sa_mask, &lsa->lsa_mask);
113 lsa->lsa_handler = bsa->sa_handler;
114 lsa->lsa_restorer = NULL; /* unsupported */
115 lsa->lsa_flags = 0;
116 if (bsa->sa_flags & SA_NOCLDSTOP)
117 lsa->lsa_flags |= LINUX_SA_NOCLDSTOP;
118 if (bsa->sa_flags & SA_NOCLDWAIT)
119 lsa->lsa_flags |= LINUX_SA_NOCLDWAIT;
120 if (bsa->sa_flags & SA_SIGINFO)
121 lsa->lsa_flags |= LINUX_SA_SIGINFO;
122 if (bsa->sa_flags & SA_ONSTACK)
123 lsa->lsa_flags |= LINUX_SA_ONSTACK;
124 if (bsa->sa_flags & SA_RESTART)
125 lsa->lsa_flags |= LINUX_SA_RESTART;
126 if (bsa->sa_flags & SA_RESETHAND)
127 lsa->lsa_flags |= LINUX_SA_ONESHOT;
128 if (bsa->sa_flags & SA_NODEFER)
129 lsa->lsa_flags |= LINUX_SA_NOMASK;
130 }
131
132 int
133 linux_do_sigaction(struct proc *p, int linux_sig, l_sigaction_t *linux_nsa,
134 l_sigaction_t *linux_osa)
135 {
136 struct sigaction *nsa, *osa;
137 struct sigaction_args sa_args;
138 int error;
139 caddr_t sg = stackgap_init();
140
141 if (linux_sig <= 0 || linux_sig > LINUX_NSIG)
142 return (EINVAL);
143
144 if (linux_osa != NULL)
145 osa = stackgap_alloc(&sg, sizeof(struct sigaction));
146 else
147 osa = NULL;
148
149 if (linux_nsa != NULL) {
150 nsa = stackgap_alloc(&sg, sizeof(struct sigaction));
151 linux_to_bsd_sigaction(linux_nsa, nsa);
152 }
153 else
154 nsa = NULL;
155
156 #ifndef __alpha__
157 if (linux_sig <= LINUX_SIGTBLSZ)
158 sa_args.sig = linux_to_bsd_signal[_SIG_IDX(linux_sig)];
159 else
160 #endif
161 sa_args.sig = linux_sig;
162
163 sa_args.act = nsa;
164 sa_args.oact = osa;
165 error = sigaction(p, &sa_args);
166 if (error)
167 return (error);
168
169 if (linux_osa != NULL)
170 bsd_to_linux_sigaction(osa, linux_osa);
171
172 return (0);
173 }
174
175
176 #ifndef __alpha__
177 int
178 linux_signal(struct proc *p, struct linux_signal_args *args)
179 {
180 l_sigaction_t nsa, osa;
181 int error;
182
183 #ifdef DEBUG
184 if (ldebug(signal))
185 printf(ARGS(signal, "%d, %p"),
186 args->sig, (void *)args->handler);
187 #endif
188
189 nsa.lsa_handler = args->handler;
190 nsa.lsa_flags = LINUX_SA_ONESHOT | LINUX_SA_NOMASK;
191 LINUX_SIGEMPTYSET(nsa.lsa_mask);
192
193 error = linux_do_sigaction(p, args->sig, &nsa, &osa);
194 p->p_retval[0] = (int)osa.lsa_handler;
195
196 return (error);
197 }
198 #endif /*!__alpha__*/
199
200 int
201 linux_rt_sigaction(struct proc *p, struct linux_rt_sigaction_args *args)
202 {
203 l_sigaction_t nsa, osa;
204 int error;
205
206 #ifdef DEBUG
207 if (ldebug(rt_sigaction))
208 printf(ARGS(rt_sigaction, "%ld, %p, %p, %ld"),
209 (long)args->sig, (void *)args->act,
210 (void *)args->oact, (long)args->sigsetsize);
211 #endif
212
213 if (args->sigsetsize != sizeof(l_sigset_t))
214 return (EINVAL);
215
216 if (args->act != NULL) {
217 error = copyin(args->act, &nsa, sizeof(l_sigaction_t));
218 if (error)
219 return (error);
220 }
221
222 error = linux_do_sigaction(p, args->sig,
223 args->act ? &nsa : NULL,
224 args->oact ? &osa : NULL);
225
226 if (args->oact != NULL && !error) {
227 error = copyout(&osa, args->oact, sizeof(l_sigaction_t));
228 }
229
230 return (error);
231 }
232
233 static int
234 linux_do_sigprocmask(struct proc *p, int how, l_sigset_t *new,
235 l_sigset_t *old)
236 {
237 int error;
238 sigset_t mask;
239
240 error = 0;
241 p->p_retval[0] = 0;
242
243 if (old != NULL)
244 bsd_to_linux_sigset(&p->p_sigmask, old);
245
246 if (new != NULL) {
247 linux_to_bsd_sigset(new, &mask);
248
249 switch (how) {
250 case LINUX_SIG_BLOCK:
251 SIGSETOR(p->p_sigmask, mask);
252 SIG_CANTMASK(p->p_sigmask);
253 break;
254 case LINUX_SIG_UNBLOCK:
255 SIGSETNAND(p->p_sigmask, mask);
256 break;
257 case LINUX_SIG_SETMASK:
258 p->p_sigmask = mask;
259 SIG_CANTMASK(p->p_sigmask);
260 break;
261 default:
262 error = EINVAL;
263 break;
264 }
265 }
266
267 return (error);
268 }
269
270 #ifndef __alpha__
271 int
272 linux_sigprocmask(struct proc *p, struct linux_sigprocmask_args *args)
273 {
274 l_osigset_t mask;
275 l_sigset_t set, oset;
276 int error;
277
278 #ifdef DEBUG
279 if (ldebug(sigprocmask))
280 printf(ARGS(sigprocmask, "%d, *, *"), args->how);
281 #endif
282
283 if (args->mask != NULL) {
284 error = copyin(args->mask, &mask, sizeof(l_osigset_t));
285 if (error)
286 return (error);
287 LINUX_SIGEMPTYSET(set);
288 set.__bits[0] = mask;
289 }
290
291 error = linux_do_sigprocmask(p, args->how,
292 args->mask ? &set : NULL,
293 args->omask ? &oset : NULL);
294
295 if (args->omask != NULL && !error) {
296 mask = oset.__bits[0];
297 error = copyout(&mask, args->omask, sizeof(l_osigset_t));
298 }
299
300 return (error);
301 }
302 #endif /*!__alpha__*/
303
304 int
305 linux_rt_sigprocmask(struct proc *p, struct linux_rt_sigprocmask_args *args)
306 {
307 l_sigset_t set, oset;
308 int error;
309
310 #ifdef DEBUG
311 if (ldebug(rt_sigprocmask))
312 printf(ARGS(rt_sigprocmask, "%d, %p, %p, %ld"),
313 args->how, (void *)args->mask,
314 (void *)args->omask, (long)args->sigsetsize);
315 #endif
316
317 if (args->sigsetsize != sizeof(l_sigset_t))
318 return EINVAL;
319
320 if (args->mask != NULL) {
321 error = copyin(args->mask, &set, sizeof(l_sigset_t));
322 if (error)
323 return (error);
324 }
325
326 error = linux_do_sigprocmask(p, args->how,
327 args->mask ? &set : NULL,
328 args->omask ? &oset : NULL);
329
330 if (args->omask != NULL && !error) {
331 error = copyout(&oset, args->omask, sizeof(l_sigset_t));
332 }
333
334 return (error);
335 }
336
337 #ifndef __alpha__
338 int
339 linux_sgetmask(struct proc *p, struct linux_sgetmask_args *args)
340 {
341 l_sigset_t mask;
342
343 #ifdef DEBUG
344 if (ldebug(sgetmask))
345 printf(ARGS(sgetmask, ""));
346 #endif
347
348 bsd_to_linux_sigset(&p->p_sigmask, &mask);
349 p->p_retval[0] = mask.__bits[0];
350 return (0);
351 }
352
353 int
354 linux_ssetmask(struct proc *p, struct linux_ssetmask_args *args)
355 {
356 l_sigset_t lset;
357 sigset_t bset;
358
359 #ifdef DEBUG
360 if (ldebug(ssetmask))
361 printf(ARGS(ssetmask, "%08lx"), (unsigned long)args->mask);
362 #endif
363
364 bsd_to_linux_sigset(&p->p_sigmask, &lset);
365 p->p_retval[0] = lset.__bits[0];
366 LINUX_SIGEMPTYSET(lset);
367 lset.__bits[0] = args->mask;
368 linux_to_bsd_sigset(&lset, &bset);
369 p->p_sigmask = bset;
370 SIG_CANTMASK(p->p_sigmask);
371 return (0);
372 }
373
374 int
375 linux_sigpending(struct proc *p, struct linux_sigpending_args *args)
376 {
377 sigset_t bset;
378 l_sigset_t lset;
379 l_osigset_t mask;
380
381 #ifdef DEBUG
382 if (ldebug(sigpending))
383 printf(ARGS(sigpending, "*"));
384 #endif
385
386 bset = p->p_siglist;
387 SIGSETAND(bset, p->p_sigmask);
388 bsd_to_linux_sigset(&bset, &lset);
389 mask = lset.__bits[0];
390 return (copyout(&mask, args->mask, sizeof(mask)));
391 }
392 #endif /*!__alpha__*/
393
394 int
395 linux_kill(struct proc *p, struct linux_kill_args *args)
396 {
397 struct kill_args /* {
398 int pid;
399 int signum;
400 } */ tmp;
401
402 #ifdef DEBUG
403 if (ldebug(kill))
404 printf(ARGS(kill, "%d, %d"), args->pid, args->signum);
405 #endif
406
407 /*
408 * Allow signal 0 as a means to check for privileges
409 */
410 if (args->signum < 0 || args->signum > LINUX_NSIG)
411 return EINVAL;
412
413 #ifndef __alpha__
414 if (args->signum > 0 && args->signum <= LINUX_SIGTBLSZ)
415 tmp.signum = linux_to_bsd_signal[_SIG_IDX(args->signum)];
416 else
417 #endif
418 tmp.signum = args->signum;
419
420 tmp.pid = args->pid;
421 return (kill(p, &tmp));
422 }
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