1 /* $NetBSD: linux_sigaction.c,v 1.36 2021/09/23 06:56:27 ryo Exp $ */
2
3 /*-
4 * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Frank van der Linden and Eric Haszlakiewicz.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*
33 * heavily from: svr4_signal.c,v 1.7 1995/01/09 01:04:21 christos Exp
34 */
35
36 #include <sys/cdefs.h>
37 __KERNEL_RCSID(0, "$NetBSD: linux_sigaction.c,v 1.36 2021/09/23 06:56:27 ryo Exp $");
38
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/proc.h>
42 #include <sys/filedesc.h>
43 #include <sys/mount.h>
44 #include <sys/kernel.h>
45 #include <sys/signal.h>
46 #include <sys/signalvar.h>
47
48 #include <sys/syscallargs.h>
49
50 #include <compat/linux/common/linux_types.h>
51 #include <compat/linux/common/linux_signal.h>
52 #include <compat/linux/common/linux_util.h>
53 #include <compat/linux/common/linux_ipc.h>
54 #include <compat/linux/common/linux_sem.h>
55
56 #include <compat/linux/linux_syscallargs.h>
57
58 /* Used on: alpha (aka osf_sigaction), arm, i386, m68k, mips, ppc */
59 /* Not used on: aarch64, sparc, sparc64, amd64 */
60
61 /*
62 * The Linux sigaction() system call. Do the usual conversions,
63 * and just call sigaction().
64 */
65 int
linux_sys_sigaction(struct lwp * l,const struct linux_sys_sigaction_args * uap,register_t * retval)66 linux_sys_sigaction(struct lwp *l, const struct linux_sys_sigaction_args *uap, register_t *retval)
67 {
68 /* {
69 syscallarg(int) signum;
70 syscallarg(const struct linux_old_sigaction *) nsa;
71 syscallarg(struct linux_old_sigaction *) osa;
72 } */
73 struct linux_old_sigaction nlsa, olsa;
74 struct sigaction nbsa, obsa;
75 int error, sig;
76
77 /* XXX XAX handle switch to RT signal handler */
78 /* XXX XAX and update emuldata->ps_siginfo. */
79
80 if (SCARG(uap, nsa)) {
81 error = copyin(SCARG(uap, nsa), &nlsa, sizeof(nlsa));
82 if (error)
83 return (error);
84 linux_old_to_native_sigaction(&nbsa, &nlsa);
85 }
86 sig = SCARG(uap, signum);
87 /*
88 * XXX: Linux has 33 realtime signals, the go binary wants to
89 * reset all of them; nothing else uses the last RT signal, so for
90 * now ignore it.
91 */
92 if (sig == LINUX__NSIG) {
93 uprintf("%s: setting signal %d ignored\n", __func__, sig);
94 sig--; /* back to 63 which is ignored */
95 }
96 if (sig < 0 || sig >= LINUX__NSIG)
97 return (EINVAL);
98 if (sig > 0 && !linux_to_native_signo[sig]) {
99 /* Pretend that we did something useful for unknown signals. */
100 obsa.sa_handler = SIG_IGN;
101 sigemptyset(&obsa.sa_mask);
102 obsa.sa_flags = 0;
103 } else {
104 error = sigaction1(l, linux_to_native_signo[sig],
105 SCARG(uap, nsa) ? &nbsa : 0, SCARG(uap, osa) ? &obsa : 0,
106 NULL, 0);
107 if (error)
108 return (error);
109 }
110 if (SCARG(uap, osa)) {
111 native_to_linux_old_sigaction(&olsa, &obsa);
112 error = copyout(&olsa, SCARG(uap, osa), sizeof(olsa));
113 if (error)
114 return (error);
115 }
116 return (0);
117 }
118