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      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
     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