xref: /freebsd/sys/compat/linux/linux_signal.c (revision 77a0943ded95b9e6438f7db70c4a28e4d93946d4) 
1 /*-
2  * Copyright (c) 1994-1995 S�ren 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/sysproto.h>
34 #include <sys/proc.h>
35 #include <sys/signalvar.h>
36 
37 #include <machine/../linux/linux.h>
38 #ifdef __alpha__
39 #include <linux_proto.h>
40 #else
41 #include <machine/../linux/linux_proto.h>
42 #endif
43 #include <compat/linux/linux_signal.h>
44 #include <compat/linux/linux_util.h>
45 
46 void
47 linux_to_bsd_sigset(linux_sigset_t *lss, sigset_t *bss)
48 {
49 	int b, l;
50 
51 	SIGEMPTYSET(*bss);
52 	bss->__bits[0] = lss->__bits[0] & ~((1U << LINUX_SIGTBLSZ) - 1);
53 	bss->__bits[1] = lss->__bits[1];
54 	for (l = 1; l <= LINUX_SIGTBLSZ; l++) {
55 		if (LINUX_SIGISMEMBER(*lss, l)) {
56 #ifdef __alpha__
57 			b = _SIG_IDX(l);
58 #else
59 			b = linux_to_bsd_signal[_SIG_IDX(l)];
60 #endif
61 			if (b)
62 				SIGADDSET(*bss, b);
63 		}
64 	}
65 }
66 
67 void
68 bsd_to_linux_sigset(sigset_t *bss, linux_sigset_t *lss)
69 {
70 	int b, l;
71 
72 	LINUX_SIGEMPTYSET(*lss);
73 	lss->__bits[0] = bss->__bits[0] & ~((1U << LINUX_SIGTBLSZ) - 1);
74 	lss->__bits[1] = bss->__bits[1];
75 	for (b = 1; b <= LINUX_SIGTBLSZ; b++) {
76 		if (SIGISMEMBER(*bss, b)) {
77 #if __alpha__
78 			l = _SIG_IDX(b);
79 #else
80 			l = bsd_to_linux_signal[_SIG_IDX(b)];
81 #endif
82 			if (l)
83 				LINUX_SIGADDSET(*lss, l);
84 		}
85 	}
86 }
87 
88 static void
89 linux_to_bsd_sigaction(linux_sigaction_t *lsa, struct sigaction *bsa)
90 {
91 
92 	linux_to_bsd_sigset(&lsa->lsa_mask, &bsa->sa_mask);
93 	bsa->sa_handler = lsa->lsa_handler;
94 	bsa->sa_flags = 0;
95 	if (lsa->lsa_flags & LINUX_SA_NOCLDSTOP)
96 		bsa->sa_flags |= SA_NOCLDSTOP;
97 	if (lsa->lsa_flags & LINUX_SA_NOCLDWAIT)
98 		bsa->sa_flags |= SA_NOCLDWAIT;
99 	if (lsa->lsa_flags & LINUX_SA_SIGINFO)
100 		bsa->sa_flags |= SA_SIGINFO;
101 	if (lsa->lsa_flags & LINUX_SA_ONSTACK)
102 		bsa->sa_flags |= SA_ONSTACK;
103 	if (lsa->lsa_flags & LINUX_SA_RESTART)
104 		bsa->sa_flags |= SA_RESTART;
105 	if (lsa->lsa_flags & LINUX_SA_ONESHOT)
106 		bsa->sa_flags |= SA_RESETHAND;
107 	if (lsa->lsa_flags & LINUX_SA_NOMASK)
108 		bsa->sa_flags |= SA_NODEFER;
109 }
110 
111 static void
112 bsd_to_linux_sigaction(struct sigaction *bsa, linux_sigaction_t *lsa)
113 {
114 
115 	bsd_to_linux_sigset(&bsa->sa_mask, &lsa->lsa_mask);
116 	lsa->lsa_handler = bsa->sa_handler;
117 	lsa->lsa_restorer = NULL;	/* unsupported */
118 	lsa->lsa_flags = 0;
119 	if (bsa->sa_flags & SA_NOCLDSTOP)
120 		lsa->lsa_flags |= LINUX_SA_NOCLDSTOP;
121 	if (bsa->sa_flags & SA_NOCLDWAIT)
122 		lsa->lsa_flags |= LINUX_SA_NOCLDWAIT;
123 	if (bsa->sa_flags & SA_SIGINFO)
124 		lsa->lsa_flags |= LINUX_SA_SIGINFO;
125 	if (bsa->sa_flags & SA_ONSTACK)
126 		lsa->lsa_flags |= LINUX_SA_ONSTACK;
127 	if (bsa->sa_flags & SA_RESTART)
128 		lsa->lsa_flags |= LINUX_SA_RESTART;
129 	if (bsa->sa_flags & SA_RESETHAND)
130 		lsa->lsa_flags |= LINUX_SA_ONESHOT;
131 	if (bsa->sa_flags & SA_NODEFER)
132 		lsa->lsa_flags |= LINUX_SA_NOMASK;
133 }
134 
135 int
136 linux_do_sigaction(struct proc *p, int linux_sig, linux_sigaction_t *linux_nsa,
137 		   linux_sigaction_t *linux_osa)
138 {
139 	struct sigaction *nsa, *osa;
140 	struct sigaction_args sa_args;
141 	int error;
142 	caddr_t sg = stackgap_init();
143 
144 	if (linux_sig <= 0 || linux_sig > LINUX_NSIG)
145 		return (EINVAL);
146 
147 	if (linux_osa != NULL)
148 		osa = stackgap_alloc(&sg, sizeof(struct sigaction));
149 	else
150 		osa = NULL;
151 
152 	if (linux_nsa != NULL) {
153 		nsa = stackgap_alloc(&sg, sizeof(struct sigaction));
154 		linux_to_bsd_sigaction(linux_nsa, nsa);
155 	}
156 	else
157 		nsa = NULL;
158 
159 #ifndef __alpha__
160 	if (linux_sig <= LINUX_SIGTBLSZ)
161 		sa_args.sig = linux_to_bsd_signal[_SIG_IDX(linux_sig)];
162 	else
163 #endif
164 		sa_args.sig = linux_sig;
165 
166 	sa_args.act = nsa;
167 	sa_args.oact = osa;
168 	error = sigaction(p, &sa_args);
169 	if (error)
170 		return (error);
171 
172 	if (linux_osa != NULL)
173 		bsd_to_linux_sigaction(osa, linux_osa);
174 
175 	return (0);
176 }
177 
178 
179 #ifndef __alpha__
180 int
181 linux_signal(struct proc *p, struct linux_signal_args *args)
182 {
183 	linux_sigaction_t nsa, osa;
184 	int error;
185 
186 #ifdef DEBUG
187 	printf("Linux-emul(%ld): signal(%d, %p)\n",
188 	       (long)p->p_pid, args->sig, (void *)args->handler);
189 #endif
190 
191 	nsa.lsa_handler = args->handler;
192 	nsa.lsa_flags = LINUX_SA_ONESHOT | LINUX_SA_NOMASK;
193 	LINUX_SIGEMPTYSET(nsa.lsa_mask);
194 
195 	error = linux_do_sigaction(p, args->sig, &nsa, &osa);
196 	p->p_retval[0] = (int)osa.lsa_handler;
197 
198 	return (error);
199 }
200 #endif	/*!__alpha__*/
201 
202 int
203 linux_rt_sigaction(struct proc *p, struct linux_rt_sigaction_args *args)
204 {
205 	linux_sigaction_t nsa, osa;
206 	int error;
207 
208 #ifdef DEBUG
209 	printf("Linux-emul(%ld): rt_sigaction(%ld, %p, %p, %ld)\n",
210 	       (long)p->p_pid, (long)args->sig, (void *)args->act,
211 	       (void *)args->oact, (long)args->sigsetsize);
212 #endif
213 
214 	if (args->sigsetsize != sizeof(linux_sigset_t))
215 		return (EINVAL);
216 
217 	if (args->act != NULL) {
218 		error = copyin(args->act, &nsa, sizeof(linux_sigaction_t));
219 		if (error)
220 			return (error);
221 	}
222 
223 	error = linux_do_sigaction(p, args->sig,
224 				   args->act ? &nsa : NULL,
225 				   args->oact ? &osa : NULL);
226 
227 	if (args->oact != NULL && !error) {
228 		error = copyout(&osa, args->oact, sizeof(linux_sigaction_t));
229 	}
230 
231 	return (error);
232 }
233 
234 static int
235 linux_do_sigprocmask(struct proc *p, int how, linux_sigset_t *new,
236 		     linux_sigset_t *old)
237 {
238 	int error, s;
239 	sigset_t mask;
240 
241 	error = 0;
242 	p->p_retval[0] = 0;
243 
244 	if (old != NULL)
245 		bsd_to_linux_sigset(&p->p_sigmask, old);
246 
247 	if (new != NULL) {
248 		linux_to_bsd_sigset(new, &mask);
249 
250 		s = splhigh();
251 
252 		switch (how) {
253 		case LINUX_SIG_BLOCK:
254 			SIGSETOR(p->p_sigmask, mask);
255 			SIG_CANTMASK(p->p_sigmask);
256 			break;
257 		case LINUX_SIG_UNBLOCK:
258 			SIGSETNAND(p->p_sigmask, mask);
259 			break;
260 		case LINUX_SIG_SETMASK:
261 			p->p_sigmask = mask;
262 			SIG_CANTMASK(p->p_sigmask);
263 			break;
264 		default:
265 			error = EINVAL;
266 			break;
267 		}
268 
269 		splx(s);
270 	}
271 
272 	return (error);
273 }
274 
275 #ifndef __alpha__
276 int
277 linux_sigprocmask(struct proc *p, struct linux_sigprocmask_args *args)
278 {
279 	linux_osigset_t mask;
280 	linux_sigset_t set, oset;
281 	int error;
282 
283 #ifdef DEBUG
284 	printf("Linux-emul(%d): sigprocmask(%d, *, *)\n", p->p_pid, args->how);
285 #endif
286 
287 	if (args->mask != NULL) {
288 		error = copyin(args->mask, &mask, sizeof(linux_osigset_t));
289 		if (error)
290 			return (error);
291 		LINUX_SIGEMPTYSET(set);
292 		set.__bits[0] = mask;
293 	}
294 
295 	error = linux_do_sigprocmask(p, args->how,
296 				     args->mask ? &set : NULL,
297 				     args->omask ? &oset : NULL);
298 
299 	if (args->omask != NULL && !error) {
300 		mask = oset.__bits[0];
301 		error = copyout(&mask, args->omask, sizeof(linux_osigset_t));
302 	}
303 
304 	return (error);
305 }
306 #endif	/*!__alpha__*/
307 
308 int
309 linux_rt_sigprocmask(struct proc *p, struct linux_rt_sigprocmask_args *args)
310 {
311 	linux_sigset_t set, oset;
312 	int error;
313 
314 #ifdef DEBUG
315 	printf("Linux-emul(%ld): rt_sigprocmask(%d, %p, %p, %ld)\n",
316 	       (long)p->p_pid, args->how, (void *)args->mask,
317 	       (void *)args->omask, (long)args->sigsetsize);
318 #endif
319 
320 	if (args->sigsetsize != sizeof(linux_sigset_t))
321 		return EINVAL;
322 
323 	if (args->mask != NULL) {
324 		error = copyin(args->mask, &set, sizeof(linux_sigset_t));
325 		if (error)
326 			return (error);
327 	}
328 
329 	error = linux_do_sigprocmask(p, args->how,
330 				     args->mask ? &set : NULL,
331 				     args->omask ? &oset : NULL);
332 
333 	if (args->omask != NULL && !error) {
334 		error = copyout(&oset, args->omask, sizeof(linux_sigset_t));
335 	}
336 
337 	return (error);
338 }
339 
340 #ifndef __alpha__
341 int
342 linux_siggetmask(struct proc *p, struct linux_siggetmask_args *args)
343 {
344 	linux_sigset_t mask;
345 
346 #ifdef DEBUG
347 	printf("Linux-emul(%d): siggetmask()\n", p->p_pid);
348 #endif
349 
350 	bsd_to_linux_sigset(&p->p_sigmask, &mask);
351 	p->p_retval[0] = mask.__bits[0];
352 	return (0);
353 }
354 
355 int
356 linux_sigsetmask(struct proc *p, struct linux_sigsetmask_args *args)
357 {
358 	linux_sigset_t lset;
359 	sigset_t bset;
360 	int s;
361 
362 #ifdef DEBUG
363 	printf("Linux-emul(%ld): sigsetmask(%08lx)\n",
364 	       (long)p->p_pid, (unsigned long)args->mask);
365 #endif
366 
367 	bsd_to_linux_sigset(&p->p_sigmask, &lset);
368 	p->p_retval[0] = lset.__bits[0];
369 	LINUX_SIGEMPTYSET(lset);
370 	lset.__bits[0] = args->mask;
371 	linux_to_bsd_sigset(&lset, &bset);
372 	s = splhigh();
373 	p->p_sigmask = bset;
374 	SIG_CANTMASK(p->p_sigmask);
375 	splx(s);
376 	return (0);
377 }
378 
379 int
380 linux_sigpending(struct proc *p, struct linux_sigpending_args *args)
381 {
382 	sigset_t bset;
383 	linux_sigset_t lset;
384 	linux_osigset_t mask;
385 
386 #ifdef DEBUG
387 	printf("Linux-emul(%d): sigpending(*)\n", p->p_pid);
388 #endif
389 
390 	bset = p->p_siglist;
391 	SIGSETAND(bset, p->p_sigmask);
392 	bsd_to_linux_sigset(&bset, &lset);
393 	mask = lset.__bits[0];
394 	return (copyout(&mask, args->mask, sizeof(mask)));
395 }
396 #endif	/*!__alpha__*/
397 
398 int
399 linux_kill(struct proc *p, struct linux_kill_args *args)
400 {
401 	struct kill_args /* {
402 	    int pid;
403 	    int signum;
404 	} */ tmp;
405 
406 #ifdef DEBUG
407 	printf("Linux-emul(%d): kill(%d, %d)\n",
408 	       p->p_pid, args->pid, args->signum);
409 #endif
410 
411 	/*
412 	 * Allow signal 0 as a means to check for privileges
413 	 */
414 	if (args->signum < 0 || args->signum > LINUX_NSIG)
415 		return EINVAL;
416 
417 #ifndef __alpha__
418 	if (args->signum > 0 && args->signum <= LINUX_SIGTBLSZ)
419 		tmp.signum = linux_to_bsd_signal[_SIG_IDX(args->signum)];
420 	else
421 #endif
422 		tmp.signum = args->signum;
423 
424 	tmp.pid = args->pid;
425 	return (kill(p, &tmp));
426 }
427