1 /* $NetBSD: kern_sig_43.c,v 1.27 2007/10/19 12:16:36 ad 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: kern_sig_43.c,v 1.27 2007/10/19 12:16:36 ad Exp $"); 41 42 #if defined(_KERNEL_OPT) 43 #include "opt_compat_netbsd.h" 44 #endif 45 46 #include <sys/param.h> 47 #include <sys/signalvar.h> 48 #include <sys/resourcevar.h> 49 #include <sys/namei.h> 50 #include <sys/vnode.h> 51 #include <sys/proc.h> 52 #include <sys/systm.h> 53 #include <sys/timeb.h> 54 #include <sys/times.h> 55 #include <sys/buf.h> 56 #include <sys/acct.h> 57 #include <sys/file.h> 58 #include <sys/kernel.h> 59 #include <sys/wait.h> 60 #include <sys/ktrace.h> 61 #include <sys/syslog.h> 62 #include <sys/stat.h> 63 #include <sys/core.h> 64 #include <sys/kauth.h> 65 66 #include <sys/mount.h> 67 #include <sys/syscallargs.h> 68 69 #include <sys/cpu.h> 70 71 #include <sys/user.h> /* for coredump */ 72 73 #include <compat/sys/signal.h> 74 75 void compat_43_sigmask_to_sigset __P((const int *, sigset_t *)); 76 void compat_43_sigset_to_sigmask __P((const sigset_t *, int *)); 77 void compat_43_sigvec_to_sigaction __P((const struct sigvec *, struct sigaction *)); 78 void compat_43_sigaction_to_sigvec __P((const struct sigaction *, struct sigvec *)); 79 void compat_43_sigstack_to_sigaltstack __P((const struct sigstack *, struct sigaltstack *)); 80 void compat_43_sigaltstack_to_sigstack __P((const struct sigaltstack *, struct sigstack *)); 81 82 void 83 compat_43_sigmask_to_sigset(sm, ss) 84 const int *sm; 85 sigset_t *ss; 86 { 87 88 ss->__bits[0] = *sm; 89 ss->__bits[1] = 0; 90 ss->__bits[2] = 0; 91 ss->__bits[3] = 0; 92 } 93 94 void 95 compat_43_sigset_to_sigmask(ss, sm) 96 const sigset_t *ss; 97 int *sm; 98 { 99 100 *sm = ss->__bits[0]; 101 } 102 103 void 104 compat_43_sigvec_to_sigaction(sv, sa) 105 const struct sigvec *sv; 106 struct sigaction *sa; 107 { 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(sa, sv) 115 const struct sigaction *sa; 116 struct sigvec *sv; 117 { 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(ss, sa) 125 const struct sigstack *ss; 126 struct sigaltstack *sa; 127 { 128 sa->ss_sp = ss->ss_sp; 129 sa->ss_size = SIGSTKSZ; /* Use the recommended size */ 130 sa->ss_flags = 0; 131 if (ss->ss_onstack) 132 sa->ss_flags |= SS_ONSTACK; 133 } 134 135 void 136 compat_43_sigaltstack_to_sigstack(sa, ss) 137 const struct sigaltstack *sa; 138 struct sigstack *ss; 139 { 140 ss->ss_sp = sa->ss_sp; 141 if (sa->ss_flags & SS_ONSTACK) 142 ss->ss_onstack = 1; 143 else 144 ss->ss_onstack = 0; 145 } 146 147 int 148 compat_43_sys_sigblock(struct lwp *l, void *v, register_t *retval) 149 { 150 struct compat_43_sys_sigblock_args /* { 151 syscallarg(int) mask; 152 } */ *uap = v; 153 struct proc *p = l->l_proc; 154 int nsm, osm; 155 sigset_t nss, oss; 156 int error; 157 158 nsm = SCARG(uap, mask); 159 compat_43_sigmask_to_sigset(&nsm, &nss); 160 mutex_enter(&p->p_smutex); 161 error = sigprocmask1(l, SIG_BLOCK, &nss, &oss); 162 mutex_exit(&p->p_smutex); 163 if (error) 164 return (error); 165 compat_43_sigset_to_sigmask(&oss, &osm); 166 *retval = osm; 167 return (0); 168 } 169 170 int 171 compat_43_sys_sigsetmask(struct lwp *l, void *v, register_t *retval) 172 { 173 struct compat_43_sys_sigsetmask_args /* { 174 syscallarg(int) mask; 175 } */ *uap = v; 176 struct proc *p = l->l_proc; 177 int nsm, osm; 178 sigset_t nss, oss; 179 int error; 180 181 nsm = SCARG(uap, mask); 182 compat_43_sigmask_to_sigset(&nsm, &nss); 183 mutex_enter(&p->p_smutex); 184 error = sigprocmask1(l, SIG_SETMASK, &nss, &oss); 185 mutex_exit(&p->p_smutex); 186 if (error) 187 return (error); 188 compat_43_sigset_to_sigmask(&oss, &osm); 189 *retval = osm; 190 return (0); 191 } 192 193 /* ARGSUSED */ 194 int 195 compat_43_sys_sigstack(struct lwp *l, void *v, register_t *retval) 196 { 197 struct compat_43_sys_sigstack_args /* { 198 syscallarg(struct sigstack *) nss; 199 syscallarg(struct sigstack *) oss; 200 } */ *uap = v; 201 struct sigstack nss, oss; 202 struct sigaltstack nsa, osa; 203 int error; 204 205 if (SCARG(uap, nss)) { 206 error = copyin(SCARG(uap, nss), &nss, sizeof(nss)); 207 if (error) 208 return (error); 209 compat_43_sigstack_to_sigaltstack(&nss, &nsa); 210 } 211 error = sigaltstack1(l, 212 SCARG(uap, nss) ? &nsa : 0, SCARG(uap, oss) ? &osa : 0); 213 if (error) 214 return (error); 215 if (SCARG(uap, oss)) { 216 compat_43_sigaltstack_to_sigstack(&osa, &oss); 217 error = copyout(&oss, SCARG(uap, oss), sizeof(oss)); 218 if (error) 219 return (error); 220 } 221 return (0); 222 } 223 224 /* 225 * Generalized interface signal handler, 4.3-compatible. 226 */ 227 /* ARGSUSED */ 228 int 229 compat_43_sys_sigvec(struct lwp *l, void *v, register_t *retval) 230 { 231 struct compat_43_sys_sigvec_args /* { 232 syscallarg(int) signum; 233 syscallarg(const struct sigvec *) nsv; 234 syscallarg(struct sigvec *) osv; 235 } */ *uap = v; 236 struct sigvec nsv, osv; 237 struct sigaction nsa, osa; 238 int error; 239 240 if (SCARG(uap, nsv)) { 241 error = copyin(SCARG(uap, nsv), &nsv, sizeof(nsv)); 242 if (error) 243 return (error); 244 compat_43_sigvec_to_sigaction(&nsv, &nsa); 245 } 246 error = sigaction1(l, SCARG(uap, signum), 247 SCARG(uap, nsv) ? &nsa : 0, SCARG(uap, osv) ? &osa : 0, 248 NULL, 0); 249 if (error) 250 return (error); 251 if (SCARG(uap, osv)) { 252 compat_43_sigaction_to_sigvec(&osa, &osv); 253 error = copyout(&osv, SCARG(uap, osv), sizeof(osv)); 254 if (error) 255 return (error); 256 } 257 return (0); 258 } 259 260 261 /* ARGSUSED */ 262 int 263 compat_43_sys_killpg(struct lwp *l, void *v, register_t *retval) 264 { 265 struct compat_43_sys_killpg_args /* { 266 syscallarg(int) pgid; 267 syscallarg(int) signum; 268 } */ *uap = v; 269 ksiginfo_t ksi; 270 271 #ifdef COMPAT_09 272 SCARG(uap, pgid) = (short) SCARG(uap, pgid); 273 #endif 274 275 if ((u_int)SCARG(uap, signum) >= NSIG) 276 return (EINVAL); 277 memset(&ksi, 0, sizeof(ksi)); 278 ksi.ksi_signo = SCARG(uap, signum); 279 ksi.ksi_code = SI_USER; 280 ksi.ksi_pid = l->l_proc->p_pid; 281 ksi.ksi_uid = kauth_cred_geteuid(l->l_cred); 282 return (killpg1(l, &ksi, SCARG(uap, pgid), 0)); 283 } 284