xref: /freebsd/sys/compat/linux/linux_signal.c (revision ed403116940cbbd5dad8a3d1c3aa0e1e9771a4e9) 
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 #include <machine/../linux/linux_proto.h>
39 #include <compat/linux/linux_signal.h>
40 #include <compat/linux/linux_util.h>
41 
42 void
43 linux_to_bsd_sigset(linux_sigset_t *lss, sigset_t *bss)
44 {
45 	int b, l;
46 
47 	SIGEMPTYSET(*bss);
48 	bss->__bits[0] = lss->__bits[0] & ~((1U << LINUX_SIGTBLSZ) - 1);
49 	bss->__bits[1] = lss->__bits[1];
50 	for (l = 1; l <= LINUX_SIGTBLSZ; l++) {
51 		if (LINUX_SIGISMEMBER(*lss, l)) {
52 #ifdef __alpha__
53 			b = _SIG_IDX(l);
54 #else
55 			b = linux_to_bsd_signal[_SIG_IDX(l)];
56 #endif
57 			if (b)
58 				SIGADDSET(*bss, b);
59 		}
60 	}
61 }
62 
63 void
64 bsd_to_linux_sigset(sigset_t *bss, linux_sigset_t *lss)
65 {
66 	int b, l;
67 
68 	LINUX_SIGEMPTYSET(*lss);
69 	lss->__bits[0] = bss->__bits[0] & ~((1U << LINUX_SIGTBLSZ) - 1);
70 	lss->__bits[1] = bss->__bits[1];
71 	for (b = 1; b <= LINUX_SIGTBLSZ; b++) {
72 		if (SIGISMEMBER(*bss, b)) {
73 #if __alpha__
74 			l = _SIG_IDX(b);
75 #else
76 			l = bsd_to_linux_signal[_SIG_IDX(b)];
77 #endif
78 			if (l)
79 				LINUX_SIGADDSET(*lss, l);
80 		}
81 	}
82 }
83 
84 static void
85 linux_to_bsd_sigaction(linux_sigaction_t *lsa, struct sigaction *bsa)
86 {
87 
88 	linux_to_bsd_sigset(&lsa->lsa_mask, &bsa->sa_mask);
89 	bsa->sa_handler = lsa->lsa_handler;
90 	bsa->sa_flags = 0;
91 	if (lsa->lsa_flags & LINUX_SA_NOCLDSTOP)
92 		bsa->sa_flags |= SA_NOCLDSTOP;
93 	if (lsa->lsa_flags & LINUX_SA_NOCLDWAIT)
94 		bsa->sa_flags |= SA_NOCLDWAIT;
95 	if (lsa->lsa_flags & LINUX_SA_SIGINFO)
96 		bsa->sa_flags |= SA_SIGINFO;
97 	if (lsa->lsa_flags & LINUX_SA_ONSTACK)
98 		bsa->sa_flags |= SA_ONSTACK;
99 	if (lsa->lsa_flags & LINUX_SA_RESTART)
100 		bsa->sa_flags |= SA_RESTART;
101 	if (lsa->lsa_flags & LINUX_SA_ONESHOT)
102 		bsa->sa_flags |= SA_RESETHAND;
103 	if (lsa->lsa_flags & LINUX_SA_NOMASK)
104 		bsa->sa_flags |= SA_NODEFER;
105 }
106 
107 static void
108 bsd_to_linux_sigaction(struct sigaction *bsa, linux_sigaction_t *lsa)
109 {
110 
111 	bsd_to_linux_sigset(&bsa->sa_mask, &lsa->lsa_mask);
112 	lsa->lsa_handler = bsa->sa_handler;
113 	lsa->lsa_restorer = NULL;	/* unsupported */
114 	lsa->lsa_flags = 0;
115 	if (bsa->sa_flags & SA_NOCLDSTOP)
116 		lsa->lsa_flags |= LINUX_SA_NOCLDSTOP;
117 	if (bsa->sa_flags & SA_NOCLDWAIT)
118 		lsa->lsa_flags |= LINUX_SA_NOCLDWAIT;
119 	if (bsa->sa_flags & SA_SIGINFO)
120 		lsa->lsa_flags |= LINUX_SA_SIGINFO;
121 	if (bsa->sa_flags & SA_ONSTACK)
122 		lsa->lsa_flags |= LINUX_SA_ONSTACK;
123 	if (bsa->sa_flags & SA_RESTART)
124 		lsa->lsa_flags |= LINUX_SA_RESTART;
125 	if (bsa->sa_flags & SA_RESETHAND)
126 		lsa->lsa_flags |= LINUX_SA_ONESHOT;
127 	if (bsa->sa_flags & SA_NODEFER)
128 		lsa->lsa_flags |= LINUX_SA_NOMASK;
129 }
130 
131 int
132 linux_do_sigaction(struct proc *p, int linux_sig, linux_sigaction_t *linux_nsa,
133 		   linux_sigaction_t *linux_osa)
134 {
135 	struct sigaction *nsa, *osa;
136 	struct sigaction_args sa_args;
137 	int error;
138 	caddr_t sg = stackgap_init();
139 
140 	if (linux_sig <= 0 || linux_sig > LINUX_NSIG)
141 		return (EINVAL);
142 
143 	if (linux_osa != NULL)
144 		osa = stackgap_alloc(&sg, sizeof(struct sigaction));
145 	else
146 		osa = NULL;
147 
148 	if (linux_nsa != NULL) {
149 		nsa = stackgap_alloc(&sg, sizeof(struct sigaction));
150 		linux_to_bsd_sigaction(linux_nsa, nsa);
151 	}
152 	else
153 		nsa = NULL;
154 
155 #ifndef __alpha__
156 	if (linux_sig <= LINUX_SIGTBLSZ)
157 		sa_args.sig = linux_to_bsd_signal[_SIG_IDX(linux_sig)];
158 	else
159 #endif
160 		sa_args.sig = linux_sig;
161 
162 	sa_args.act = nsa;
163 	sa_args.oact = osa;
164 	error = sigaction(p, &sa_args);
165 	if (error)
166 		return (error);
167 
168 	if (linux_osa != NULL)
169 		bsd_to_linux_sigaction(osa, linux_osa);
170 
171 	return (0);
172 }
173 
174 
175 #ifndef __alpha__
176 int
177 linux_signal(struct proc *p, struct linux_signal_args *args)
178 {
179 	linux_sigaction_t nsa, osa;
180 	int error;
181 
182 #ifdef DEBUG
183 	printf("Linux-emul(%ld): signal(%d, %p)\n",
184 	       (long)p->p_pid, args->sig, (void *)args->handler);
185 #endif
186 
187 	nsa.lsa_handler = args->handler;
188 	nsa.lsa_flags = LINUX_SA_ONESHOT | LINUX_SA_NOMASK;
189 	LINUX_SIGEMPTYSET(nsa.lsa_mask);
190 
191 	error = linux_do_sigaction(p, args->sig, &nsa, &osa);
192 	p->p_retval[0] = (int)osa.lsa_handler;
193 
194 	return (error);
195 }
196 #endif	/*!__alpha__*/
197 
198 int
199 linux_rt_sigaction(struct proc *p, struct linux_rt_sigaction_args *args)
200 {
201 	linux_sigaction_t nsa, osa;
202 	int error;
203 
204 #ifdef DEBUG
205 	printf("Linux-emul(%ld): rt_sigaction(%ld, %p, %p, %ld)\n",
206 	       (long)p->p_pid, (long)args->sig, (void *)args->act,
207 	       (void *)args->oact, (long)args->sigsetsize);
208 #endif
209 
210 	if (args->sigsetsize != sizeof(linux_sigset_t))
211 		return (EINVAL);
212 
213 	if (args->act != NULL) {
214 		error = copyin(args->act, &nsa, sizeof(linux_sigaction_t));
215 		if (error)
216 			return (error);
217 	}
218 
219 	error = linux_do_sigaction(p, args->sig,
220 				   args->act ? &nsa : NULL,
221 				   args->oact ? &osa : NULL);
222 
223 	if (args->oact != NULL && !error) {
224 		error = copyout(&osa, args->oact, sizeof(linux_sigaction_t));
225 	}
226 
227 	return (error);
228 }
229 
230 static int
231 linux_do_sigprocmask(struct proc *p, int how, linux_sigset_t *new,
232 		     linux_sigset_t *old)
233 {
234 	int error, s;
235 	sigset_t mask;
236 
237 	error = 0;
238 	p->p_retval[0] = 0;
239 
240 	if (old != NULL)
241 		bsd_to_linux_sigset(&p->p_sigmask, old);
242 
243 	if (new != NULL) {
244 		linux_to_bsd_sigset(new, &mask);
245 
246 		s = splhigh();
247 
248 		switch (how) {
249 		case LINUX_SIG_BLOCK:
250 			SIGSETOR(p->p_sigmask, mask);
251 			SIG_CANTMASK(p->p_sigmask);
252 			break;
253 		case LINUX_SIG_UNBLOCK:
254 			SIGSETNAND(p->p_sigmask, mask);
255 			break;
256 		case LINUX_SIG_SETMASK:
257 			p->p_sigmask = mask;
258 			SIG_CANTMASK(p->p_sigmask);
259 			break;
260 		default:
261 			error = EINVAL;
262 			break;
263 		}
264 
265 		splx(s);
266 	}
267 
268 	return (error);
269 }
270 
271 #ifndef __alpha__
272 int
273 linux_sigprocmask(struct proc *p, struct linux_sigprocmask_args *args)
274 {
275 	linux_osigset_t mask;
276 	linux_sigset_t set, oset;
277 	int error;
278 
279 #ifdef DEBUG
280 	printf("Linux-emul(%d): sigprocmask(%d, *, *)\n", p->p_pid, args->how);
281 #endif
282 
283 	if (args->mask != NULL) {
284 		error = copyin(args->mask, &mask, sizeof(linux_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(linux_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 	linux_sigset_t set, oset;
308 	int error;
309 
310 #ifdef DEBUG
311 	printf("Linux-emul(%ld): rt_sigprocmask(%d, %p, %p, %ld)\n",
312 	       (long)p->p_pid, args->how, (void *)args->mask,
313 	       (void *)args->omask, (long)args->sigsetsize);
314 #endif
315 
316 	if (args->sigsetsize != sizeof(linux_sigset_t))
317 		return EINVAL;
318 
319 	if (args->mask != NULL) {
320 		error = copyin(args->mask, &set, sizeof(linux_sigset_t));
321 		if (error)
322 			return (error);
323 	}
324 
325 	error = linux_do_sigprocmask(p, args->how,
326 				     args->mask ? &set : NULL,
327 				     args->omask ? &oset : NULL);
328 
329 	if (args->omask != NULL && !error) {
330 		error = copyout(&oset, args->omask, sizeof(linux_sigset_t));
331 	}
332 
333 	return (error);
334 }
335 
336 #ifndef __alpha__
337 int
338 linux_siggetmask(struct proc *p, struct linux_siggetmask_args *args)
339 {
340 	linux_sigset_t mask;
341 
342 #ifdef DEBUG
343 	printf("Linux-emul(%d): siggetmask()\n", p->p_pid);
344 #endif
345 
346 	bsd_to_linux_sigset(&p->p_sigmask, &mask);
347 	p->p_retval[0] = mask.__bits[0];
348 	return (0);
349 }
350 
351 int
352 linux_sigsetmask(struct proc *p, struct linux_sigsetmask_args *args)
353 {
354 	linux_sigset_t lset;
355 	sigset_t bset;
356 	int s;
357 
358 #ifdef DEBUG
359 	printf("Linux-emul(%ld): sigsetmask(%08lx)\n",
360 	       (long)p->p_pid, (unsigned long)args->mask);
361 #endif
362 
363 	bsd_to_linux_sigset(&p->p_sigmask, &lset);
364 	p->p_retval[0] = lset.__bits[0];
365 	LINUX_SIGEMPTYSET(lset);
366 	lset.__bits[0] = args->mask;
367 	linux_to_bsd_sigset(&lset, &bset);
368 	s = splhigh();
369 	p->p_sigmask = bset;
370 	SIG_CANTMASK(p->p_sigmask);
371 	splx(s);
372 	return (0);
373 }
374 
375 int
376 linux_sigpending(struct proc *p, struct linux_sigpending_args *args)
377 {
378 	sigset_t bset;
379 	linux_sigset_t lset;
380 	linux_osigset_t mask;
381 
382 #ifdef DEBUG
383 	printf("Linux-emul(%d): sigpending(*)\n", p->p_pid);
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 	printf("Linux-emul(%d): kill(%d, %d)\n",
404 	       p->p_pid, 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 }
423