/* $NetBSD: kern_sig_16.c,v 1.10 2024/12/10 10:52:05 mlelstv Exp $ */ /*- * Copyright (c) 2006, 2007, 2008 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Andrew Doran. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * Copyright (c) 1982, 1986, 1989, 1991, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)kern_sig.c 8.14 (Berkeley) 5/14/95 */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: kern_sig_16.c,v 1.10 2024/12/10 10:52:05 mlelstv Exp $"); #if defined(_KERNEL_OPT) #include "opt_compat_netbsd.h" #endif #include <sys/param.h> #include <sys/exec.h> #include <sys/kernel.h> #include <sys/rwlock.h> #include <sys/signalvar.h> #include <sys/proc.h> #include <sys/pool.h> #include <sys/syscall.h> #include <sys/syscallvar.h> #include <sys/syscallargs.h> #include <sys/kauth.h> #include <sys/wait.h> #include <sys/kmem.h> #include <sys/compat_stub.h> #include <uvm/uvm_object.h> #include <uvm/uvm_prot.h> #include <uvm/uvm_pager.h> #include <compat/common/compat_mod.h> #ifdef COMPAT_NETBSD32 # ifndef __aarch64__ # define COMPAT_SIGCONTEXT # endif #else /* COMPAT_NETBSD32 */ # if !defined(__amd64__) && !defined(__aarch64__) # define COMPAT_SIGCONTEXT # endif #endif /* COMPAT_NETBSD32 */ #ifdef COMPAT_SIGCONTEXT extern char sigcode[], esigcode[]; struct uvm_object *emul_netbsd_object; #endif static const struct syscall_package kern_sig_16_syscalls[] = { #ifdef COMPAT_SIGCONTEXT { SYS_compat_16___sigaction14, 0, (sy_call_t *)compat_16_sys___sigaction14 }, /* compat_16_sigreturn14 is in MD code! */ { SYS_compat_16___sigreturn14, 0, (sy_call_t *)compat_16_sys___sigreturn14 }, #endif { 0, 0, NULL } }; int compat_16_sys___sigaction14(struct lwp *l, const struct compat_16_sys___sigaction14_args *uap, register_t *retval) { /* { syscallarg(int) signum; syscallarg(const struct sigaction *) nsa; syscallarg(struct sigaction *) osa; } */ struct sigaction nsa, osa; int error; if (SCARG(uap, nsa)) { error = copyin(SCARG(uap, nsa), &nsa, sizeof(nsa)); if (error) return (error); } error = sigaction1(l, SCARG(uap, signum), SCARG(uap, nsa) ? &nsa : 0, SCARG(uap, osa) ? &osa : 0, NULL, 0); if (error) return (error); if (SCARG(uap, osa)) { error = copyout(&osa, SCARG(uap, osa), sizeof(osa)); if (error) return (error); } return (0); } int kern_sig_16_init(void) { int error; error = syscall_establish(NULL, kern_sig_16_syscalls); if (error) return error; #if defined(COMPAT_SIGCONTEXT) KASSERT(emul_netbsd.e_sigobject == NULL); rw_enter(&exec_lock, RW_WRITER); emul_netbsd.e_sigcode = sigcode; emul_netbsd.e_esigcode = esigcode; emul_netbsd.e_sigobject = &emul_netbsd_object; error = exec_sigcode_alloc(&emul_netbsd); if (error) { emul_netbsd.e_sigcode = NULL; emul_netbsd.e_esigcode = NULL; emul_netbsd.e_sigobject = NULL; } rw_exit(&exec_lock); if (error) return error; MODULE_HOOK_SET(sendsig_sigcontext_16_hook, sendsig_sigcontext); #endif return 0; } int kern_sig_16_fini(void) { proc_t *p; int error; error = syscall_disestablish(NULL, kern_sig_16_syscalls); if (error) return error; /* * Ensure sendsig_sigcontext() is not being used. * module_lock prevents the flag being set on any * further processes while we are here. See * sigaction1() for the opposing half. */ mutex_enter(&proc_lock); PROCLIST_FOREACH(p, &allproc) { if ((p->p_lflag & PL_SIGCOMPAT) != 0) { break; } } mutex_exit(&proc_lock); if (p != NULL) { syscall_establish(NULL, kern_sig_16_syscalls); return EBUSY; } #if defined(COMPAT_SIGCONTEXT) /* * The sigobject may persist if still in use, but * is reference counted so will die eventually. */ rw_enter(&exec_lock, RW_WRITER); exec_sigcode_free(&emul_netbsd); emul_netbsd_object = NULL; emul_netbsd.e_sigcode = NULL; emul_netbsd.e_esigcode = NULL; emul_netbsd.e_sigobject = NULL; rw_exit(&exec_lock); MODULE_HOOK_UNSET(sendsig_sigcontext_16_hook); #endif return 0; }
