kern_sig_43.c revision 1.34.58.2
1 /* $NetBSD: kern_sig_43.c,v 1.34.58.2 2020/04/08 14:08:00 martin 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 1.34.58.2 2020/04/08 14:08:00 martin 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 *, struct sigaltstack *); 74 void compat_43_sigaltstack_to_sigstack(const struct sigaltstack *, 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 ss->__bits[0] = *sm; 90 ss->__bits[1] = 0; 91 ss->__bits[2] = 0; 92 ss->__bits[3] = 0; 93 } 94 95 void 96 compat_43_sigset_to_sigmask(const sigset_t *ss, int *sm) 97 { 98 99 *sm = ss->__bits[0]; 100 } 101 102 void 103 compat_43_sigvec_to_sigaction(const struct sigvec *sv, struct sigaction *sa) 104 { 105 sa->sa_handler = sv->sv_handler; 106 compat_43_sigmask_to_sigset(&sv->sv_mask, &sa->sa_mask); 107 sa->sa_flags = sv->sv_flags ^ SA_RESTART; 108 } 109 110 void 111 compat_43_sigaction_to_sigvec(const struct sigaction *sa, struct sigvec *sv) 112 { 113 sv->sv_handler = sa->sa_handler; 114 compat_43_sigset_to_sigmask(&sa->sa_mask, &sv->sv_mask); 115 sv->sv_flags = sa->sa_flags ^ SA_RESTART; 116 } 117 118 void 119 compat_43_sigstack_to_sigaltstack(const struct sigstack *ss, struct sigaltstack *sa) 120 { 121 sa->ss_sp = ss->ss_sp; 122 sa->ss_size = SIGSTKSZ; /* Use the recommended size */ 123 sa->ss_flags = 0; 124 if (ss->ss_onstack) 125 sa->ss_flags |= SS_ONSTACK; 126 } 127 128 void 129 compat_43_sigaltstack_to_sigstack(const struct sigaltstack *sa, struct sigstack *ss) 130 { 131 memset(ss, 0, sizeof(*ss)); 132 ss->ss_sp = sa->ss_sp; 133 if (sa->ss_flags & SS_ONSTACK) 134 ss->ss_onstack = 1; 135 else 136 ss->ss_onstack = 0; 137 } 138 139 int 140 compat_43_sys_sigblock(struct lwp *l, const struct compat_43_sys_sigblock_args *uap, register_t *retval) 141 { 142 /* { 143 syscallarg(int) mask; 144 } */ 145 struct proc *p = l->l_proc; 146 int nsm, osm; 147 sigset_t nss, oss; 148 int error; 149 150 nsm = SCARG(uap, mask); 151 compat_43_sigmask_to_sigset(&nsm, &nss); 152 mutex_enter(p->p_lock); 153 error = sigprocmask1(l, SIG_BLOCK, &nss, &oss); 154 mutex_exit(p->p_lock); 155 if (error) 156 return (error); 157 compat_43_sigset_to_sigmask(&oss, &osm); 158 *retval = osm; 159 return (0); 160 } 161 162 int 163 compat_43_sys_sigsetmask(struct lwp *l, const struct compat_43_sys_sigsetmask_args *uap, register_t *retval) 164 { 165 /* { 166 syscallarg(int) mask; 167 } */ 168 struct proc *p = l->l_proc; 169 int nsm, osm; 170 sigset_t nss, oss; 171 int error; 172 173 nsm = SCARG(uap, mask); 174 compat_43_sigmask_to_sigset(&nsm, &nss); 175 mutex_enter(p->p_lock); 176 error = sigprocmask1(l, SIG_SETMASK, &nss, &oss); 177 mutex_exit(p->p_lock); 178 if (error) 179 return (error); 180 compat_43_sigset_to_sigmask(&oss, &osm); 181 *retval = osm; 182 return (0); 183 } 184 185 /* ARGSUSED */ 186 int 187 compat_43_sys_sigstack(struct lwp *l, const struct compat_43_sys_sigstack_args *uap, register_t *retval) 188 { 189 /* { 190 syscallarg(struct sigstack *) nss; 191 syscallarg(struct sigstack *) oss; 192 } */ 193 struct sigstack nss, oss; 194 struct sigaltstack nsa, osa; 195 int error; 196 197 if (SCARG(uap, nss)) { 198 error = copyin(SCARG(uap, nss), &nss, sizeof(nss)); 199 if (error) 200 return (error); 201 compat_43_sigstack_to_sigaltstack(&nss, &nsa); 202 } 203 error = sigaltstack1(l, 204 SCARG(uap, nss) ? &nsa : 0, SCARG(uap, oss) ? &osa : 0); 205 if (error) 206 return (error); 207 if (SCARG(uap, oss)) { 208 compat_43_sigaltstack_to_sigstack(&osa, &oss); 209 error = copyout(&oss, SCARG(uap, oss), sizeof(oss)); 210 if (error) 211 return (error); 212 } 213 return (0); 214 } 215 216 /* 217 * Generalized interface signal handler, 4.3-compatible. 218 */ 219 /* ARGSUSED */ 220 int 221 compat_43_sys_sigvec(struct lwp *l, const struct compat_43_sys_sigvec_args *uap, register_t *retval) 222 { 223 /* { 224 syscallarg(int) signum; 225 syscallarg(const struct sigvec *) nsv; 226 syscallarg(struct sigvec *) osv; 227 } */ 228 struct sigvec nsv, osv; 229 struct sigaction nsa, osa; 230 int error; 231 232 if (SCARG(uap, nsv)) { 233 error = copyin(SCARG(uap, nsv), &nsv, sizeof(nsv)); 234 if (error) 235 return (error); 236 compat_43_sigvec_to_sigaction(&nsv, &nsa); 237 } 238 error = sigaction1(l, SCARG(uap, signum), 239 SCARG(uap, nsv) ? &nsa : 0, SCARG(uap, osv) ? &osa : 0, 240 NULL, 0); 241 if (error) 242 return (error); 243 if (SCARG(uap, osv)) { 244 compat_43_sigaction_to_sigvec(&osa, &osv); 245 error = copyout(&osv, SCARG(uap, osv), sizeof(osv)); 246 if (error) 247 return (error); 248 } 249 return (0); 250 } 251 252 253 /* ARGSUSED */ 254 int 255 compat_43_sys_killpg(struct lwp *l, const struct compat_43_sys_killpg_args *uap, register_t *retval) 256 { 257 /* { 258 syscallarg(int) pgid; 259 syscallarg(int) signum; 260 } */ 261 ksiginfo_t ksi; 262 int pgid = SCARG(uap, pgid); 263 264 pgid &= kern_sig_43_pgid_mask; 265 266 if ((u_int)SCARG(uap, signum) >= NSIG) 267 return (EINVAL); 268 memset(&ksi, 0, sizeof(ksi)); 269 ksi.ksi_signo = SCARG(uap, signum); 270 ksi.ksi_code = SI_USER; 271 ksi.ksi_pid = l->l_proc->p_pid; 272 ksi.ksi_uid = kauth_cred_geteuid(l->l_cred); 273 return killpg1(l, &ksi, pgid, 0); 274 } 275 276 int 277 kern_sig_43_init(void) 278 { 279 280 return syscall_establish(NULL, kern_sig_43_syscalls); 281 } 282 283 int 284 kern_sig_43_fini(void) 285 { 286 287 return syscall_disestablish(NULL, kern_sig_43_syscalls); 288 } 289
Indexes created Wed Oct 15 03:09:54 GMT 2025