kern_sig_43.c revision 1.38
1 /* $NetBSD: kern_sig_43.c,v 1.38 2021/11/01 05:07:16 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Charles M. Hannum. 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 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: kern_sig_43.c,v 1.38 2021/11/01 05:07:16 thorpej Exp $"); 34 35 #if defined(_KERNEL_OPT) 36 #include "opt_compat_netbsd.h" 37 #endif 38 39 #include <sys/param.h> 40 #include <sys/signalvar.h> 41 #include <sys/resourcevar.h> 42 #include <sys/namei.h> 43 #include <sys/vnode.h> 44 #include <sys/proc.h> 45 #include <sys/systm.h> 46 #include <sys/timeb.h> 47 #include <sys/times.h> 48 #include <sys/buf.h> 49 #include <sys/acct.h> 50 #include <sys/file.h> 51 #include <sys/kernel.h> 52 #include <sys/wait.h> 53 #include <sys/ktrace.h> 54 #include <sys/syslog.h> 55 #include <sys/stat.h> 56 #include <sys/core.h> 57 #include <sys/kauth.h> 58 59 #include <sys/syscall.h> 60 #include <sys/syscallvar.h> 61 #include <sys/syscallargs.h> 62 #include <sys/compat_stub.h> 63 64 #include <sys/cpu.h> 65 66 #include <compat/sys/signal.h> 67 #include <compat/common/compat_mod.h> 68 69 void compat_43_sigmask_to_sigset(const int *, sigset_t *); 70 void compat_43_sigset_to_sigmask(const sigset_t *, int *); 71 void compat_43_sigvec_to_sigaction(const struct sigvec *, struct sigaction *); 72 void compat_43_sigaction_to_sigvec(const struct sigaction *, struct sigvec *); 73 void compat_43_sigstack_to_sigaltstack(const struct sigstack *, stack_t *); 74 void compat_43_sigaltstack_to_sigstack(const stack_t *, struct sigstack *); 75 76 static struct syscall_package kern_sig_43_syscalls[] = { 77 { SYS_compat_43_osigblock, 0, (sy_call_t *)compat_43_sys_sigblock }, 78 { SYS_compat_43_osigsetmask, 0, (sy_call_t *)compat_43_sys_sigsetmask }, 79 { SYS_compat_43_osigstack, 0, (sy_call_t *)compat_43_sys_sigstack }, 80 { SYS_compat_43_osigvec, 0, (sy_call_t *)compat_43_sys_sigvec }, 81 { SYS_compat_43_okillpg, 0, (sy_call_t *)compat_43_sys_killpg }, 82 { 0, 0, NULL } 83 }; 84 85 void 86 compat_43_sigmask_to_sigset(const int *sm, sigset_t *ss) 87 { 88 89 memset(ss, 0, sizeof(*ss)); 90 ss->__bits[0] = *sm; 91 ss->__bits[1] = 0; 92 ss->__bits[2] = 0; 93 ss->__bits[3] = 0; 94 } 95 96 void 97 compat_43_sigset_to_sigmask(const sigset_t *ss, int *sm) 98 { 99 100 *sm = ss->__bits[0]; 101 } 102 103 void 104 compat_43_sigvec_to_sigaction(const struct sigvec *sv, struct sigaction *sa) 105 { 106 107 memset(sa, 0, sizeof(*sa)); 108 sa->sa_handler = sv->sv_handler; 109 compat_43_sigmask_to_sigset(&sv->sv_mask, &sa->sa_mask); 110 sa->sa_flags = sv->sv_flags ^ SA_RESTART; 111 } 112 113 void 114 compat_43_sigaction_to_sigvec(const struct sigaction *sa, struct sigvec *sv) 115 { 116 117 memset(sv, 0, sizeof(*sv)); 118 sv->sv_handler = sa->sa_handler; 119 compat_43_sigset_to_sigmask(&sa->sa_mask, &sv->sv_mask); 120 sv->sv_flags = sa->sa_flags ^ SA_RESTART; 121 } 122 123 void 124 compat_43_sigstack_to_sigaltstack(const struct sigstack *ss, stack_t *sa) 125 { 126 memset(sa, 0, sizeof(*sa)); 127 sa->ss_sp = ss->ss_sp; 128 sa->ss_size = SIGSTKSZ; /* Use the recommended size */ 129 sa->ss_flags = 0; 130 if (ss->ss_onstack) 131 sa->ss_flags |= SS_ONSTACK; 132 } 133 134 void 135 compat_43_sigaltstack_to_sigstack(const stack_t *sa, struct sigstack *ss) 136 { 137 memset(ss, 0, sizeof(*ss)); 138 ss->ss_sp = sa->ss_sp; 139 if (sa->ss_flags & SS_ONSTACK) 140 ss->ss_onstack = 1; 141 else 142 ss->ss_onstack = 0; 143 } 144 145 int 146 compat_43_sys_sigblock(struct lwp *l, const struct compat_43_sys_sigblock_args *uap, register_t *retval) 147 { 148 /* { 149 syscallarg(int) mask; 150 } */ 151 struct proc *p = l->l_proc; 152 int nsm, osm; 153 sigset_t nss, oss; 154 int error; 155 156 nsm = SCARG(uap, mask); 157 compat_43_sigmask_to_sigset(&nsm, &nss); 158 mutex_enter(p->p_lock); 159 error = sigprocmask1(l, SIG_BLOCK, &nss, &oss); 160 mutex_exit(p->p_lock); 161 if (error) 162 return (error); 163 compat_43_sigset_to_sigmask(&oss, &osm); 164 *retval = osm; 165 return (0); 166 } 167 168 int 169 compat_43_sys_sigsetmask(struct lwp *l, const struct compat_43_sys_sigsetmask_args *uap, register_t *retval) 170 { 171 /* { 172 syscallarg(int) mask; 173 } */ 174 struct proc *p = l->l_proc; 175 int nsm, osm; 176 sigset_t nss, oss; 177 int error; 178 179 nsm = SCARG(uap, mask); 180 compat_43_sigmask_to_sigset(&nsm, &nss); 181 mutex_enter(p->p_lock); 182 error = sigprocmask1(l, SIG_SETMASK, &nss, &oss); 183 mutex_exit(p->p_lock); 184 if (error) 185 return (error); 186 compat_43_sigset_to_sigmask(&oss, &osm); 187 *retval = osm; 188 return (0); 189 } 190 191 /* ARGSUSED */ 192 int 193 compat_43_sys_sigstack(struct lwp *l, const struct compat_43_sys_sigstack_args *uap, register_t *retval) 194 { 195 /* { 196 syscallarg(struct sigstack *) nss; 197 syscallarg(struct sigstack *) oss; 198 } */ 199 struct sigstack nss, oss; 200 stack_t nsa, osa; 201 int error; 202 203 if (SCARG(uap, nss)) { 204 error = copyin(SCARG(uap, nss), &nss, sizeof(nss)); 205 if (error) 206 return (error); 207 compat_43_sigstack_to_sigaltstack(&nss, &nsa); 208 } 209 error = sigaltstack1(l, 210 SCARG(uap, nss) ? &nsa : 0, SCARG(uap, oss) ? &osa : 0); 211 if (error) 212 return (error); 213 if (SCARG(uap, oss)) { 214 compat_43_sigaltstack_to_sigstack(&osa, &oss); 215 error = copyout(&oss, SCARG(uap, oss), sizeof(oss)); 216 if (error) 217 return (error); 218 } 219 return (0); 220 } 221 222 /* 223 * Generalized interface signal handler, 4.3-compatible. 224 */ 225 /* ARGSUSED */ 226 int 227 compat_43_sys_sigvec(struct lwp *l, const struct compat_43_sys_sigvec_args *uap, register_t *retval) 228 { 229 /* { 230 syscallarg(int) signum; 231 syscallarg(const struct sigvec *) nsv; 232 syscallarg(struct sigvec *) osv; 233 } */ 234 struct sigvec nsv, osv; 235 struct sigaction nsa, osa; 236 int error; 237 238 if (SCARG(uap, nsv)) { 239 error = copyin(SCARG(uap, nsv), &nsv, sizeof(nsv)); 240 if (error) 241 return (error); 242 compat_43_sigvec_to_sigaction(&nsv, &nsa); 243 } 244 error = sigaction1(l, SCARG(uap, signum), 245 SCARG(uap, nsv) ? &nsa : 0, SCARG(uap, osv) ? &osa : 0, 246 NULL, 0); 247 if (error) 248 return (error); 249 if (SCARG(uap, osv)) { 250 compat_43_sigaction_to_sigvec(&osa, &osv); 251 error = copyout(&osv, SCARG(uap, osv), sizeof(osv)); 252 if (error) 253 return (error); 254 } 255 return (0); 256 } 257 258 259 /* ARGSUSED */ 260 int 261 compat_43_sys_killpg(struct lwp *l, const struct compat_43_sys_killpg_args *uap, register_t *retval) 262 { 263 /* { 264 syscallarg(int) pgid; 265 syscallarg(int) signum; 266 } */ 267 ksiginfo_t ksi; 268 int pgid = SCARG(uap, pgid); 269 270 pgid &= kern_sig_43_pgid_mask; 271 272 if ((u_int)SCARG(uap, signum) >= NSIG) 273 return (EINVAL); 274 memset(&ksi, 0, sizeof(ksi)); 275 ksi.ksi_signo = SCARG(uap, signum); 276 ksi.ksi_code = SI_USER; 277 ksi.ksi_pid = l->l_proc->p_pid; 278 ksi.ksi_uid = kauth_cred_geteuid(l->l_cred); 279 return killpg1(l, &ksi, pgid, 0); 280 } 281 282 int 283 kern_sig_43_init(void) 284 { 285 286 return syscall_establish(NULL, kern_sig_43_syscalls); 287 } 288 289 int 290 kern_sig_43_fini(void) 291 { 292 293 return syscall_disestablish(NULL, kern_sig_43_syscalls); 294 } 295
Indexes created Wed Sep 24 05:09:52 GMT 2025