/* $NetBSD: svr4_signal.c,v 1.66.12.1 2017/08/08 16:05:37 martin Exp $ */ /*- * Copyright (c) 1994, 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Christos Zoulas and by Charles M. Hannum. * * 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. */ #include __KERNEL_RCSID(0, "$NetBSD: svr4_signal.c,v 1.66.12.1 2017/08/08 16:05:37 martin Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define svr4_sigmask(n) (1 << (((n) - 1) & 31)) #define svr4_sigword(n) (((n) - 1) >> 5) #define svr4_sigemptyset(s) memset((s), 0, sizeof(*(s))) #define svr4_sigismember(s, n) ((s)->bits[svr4_sigword(n)] & svr4_sigmask(n)) #define svr4_sigaddset(s, n) ((s)->bits[svr4_sigword(n)] |= svr4_sigmask(n)) static inline void svr4_sigfillset(svr4_sigset_t *); void svr4_to_native_sigaction(const struct svr4_sigaction *, struct sigaction *); void native_to_svr4_sigaction(const struct sigaction *, struct svr4_sigaction *); extern const int native_to_svr4_signo[]; extern const int svr4_to_native_signo[]; static int svr4_decode_signum(int signum, int *native_signo, int *sigcall) { if (SVR4_SIGNO(signum) >= SVR4_NSIG) return EINVAL; if (native_signo) *native_signo = svr4_to_native_signo[SVR4_SIGNO(signum)]; if (sigcall) *sigcall = SVR4_SIGCALL(signum); return 0; } static inline void svr4_sigfillset(svr4_sigset_t *s) { int i; svr4_sigemptyset(s); for (i = 1; i < SVR4_NSIG; i++) if (svr4_to_native_signo[i] != 0) svr4_sigaddset(s, i); } void svr4_to_native_sigset(const svr4_sigset_t *sss, sigset_t *bss) { int i, newsig; sigemptyset(bss); for (i = 1; i < SVR4_NSIG; i++) { if (svr4_sigismember(sss, i)) { newsig = svr4_to_native_signo[i]; if (newsig) sigaddset(bss, newsig); } } } void native_to_svr4_sigset(const sigset_t *bss, svr4_sigset_t *sss) { int i, newsig; svr4_sigemptyset(sss); for (i = 1; i < NSIG; i++) { if (sigismember(bss, i)) { newsig = native_to_svr4_signo[i]; if (newsig) svr4_sigaddset(sss, newsig); } } } /* * XXX: Only a subset of the flags is currently implemented. */ void svr4_to_native_sigaction(const struct svr4_sigaction *ssa, struct sigaction *bsa) { bsa->sa_handler = (sig_t) ssa->svr4_sa_handler; svr4_to_native_sigset(&ssa->svr4_sa_mask, &bsa->sa_mask); bsa->sa_flags = 0; if ((ssa->svr4_sa_flags & SVR4_SA_ONSTACK) != 0) bsa->sa_flags |= SA_ONSTACK; if ((ssa->svr4_sa_flags & SVR4_SA_RESETHAND) != 0) bsa->sa_flags |= SA_RESETHAND; if ((ssa->svr4_sa_flags & SVR4_SA_RESTART) != 0) bsa->sa_flags |= SA_RESTART; if ((ssa->svr4_sa_flags & SVR4_SA_SIGINFO) != 0) bsa->sa_flags |= SA_SIGINFO; if ((ssa->svr4_sa_flags & SVR4_SA_NODEFER) != 0) bsa->sa_flags |= SA_NODEFER; if ((ssa->svr4_sa_flags & SVR4_SA_NOCLDWAIT) != 0) bsa->sa_flags |= SA_NOCLDWAIT; if ((ssa->svr4_sa_flags & SVR4_SA_NOCLDSTOP) != 0) bsa->sa_flags |= SA_NOCLDSTOP; if ((ssa->svr4_sa_flags & ~SVR4_SA_ALLBITS) != 0) { DPRINTF(("svr4_to_native_sigaction: extra bits %x ignored\n", ssa->svr4_sa_flags & ~SVR4_SA_ALLBITS)); } } void native_to_svr4_sigaction(const struct sigaction *bsa, struct svr4_sigaction *ssa) { ssa->svr4_sa_handler = (svr4_sig_t) bsa->sa_handler; native_to_svr4_sigset(&bsa->sa_mask, &ssa->svr4_sa_mask); ssa->svr4_sa_flags = 0; if ((bsa->sa_flags & SA_ONSTACK) != 0) ssa->svr4_sa_flags |= SVR4_SA_ONSTACK; if ((bsa->sa_flags & SA_RESETHAND) != 0) ssa->svr4_sa_flags |= SVR4_SA_RESETHAND; if ((bsa->sa_flags & SA_RESTART) != 0) ssa->svr4_sa_flags |= SVR4_SA_RESTART; if ((bsa->sa_flags & SA_NODEFER) != 0) ssa->svr4_sa_flags |= SVR4_SA_NODEFER; if ((bsa->sa_flags & SA_NOCLDSTOP) != 0) ssa->svr4_sa_flags |= SVR4_SA_NOCLDSTOP; } int svr4_sys_sigaction(struct lwp *l, const struct svr4_sys_sigaction_args *uap, register_t *retval) { /* { syscallarg(int) signum; syscallarg(const struct svr4_sigaction *) nsa; syscallarg(struct svr4_sigaction *) osa; } */ struct svr4_sigaction nssa, ossa; struct sigaction nbsa, obsa; int native_signo; int error; if (SCARG(uap, nsa)) { error = copyin(SCARG(uap, nsa), &nssa, sizeof(nssa)); if (error) return (error); svr4_to_native_sigaction(&nssa, &nbsa); } error = svr4_decode_signum(SCARG(uap, signum), &native_signo, NULL); if (error) return error; error = sigaction1(l, native_signo, SCARG(uap, nsa) ? &nbsa : 0, SCARG(uap, osa) ? &obsa : 0, NULL, 0); if (error) return (error); if (SCARG(uap, osa)) { native_to_svr4_sigaction(&obsa, &ossa); error = copyout(&ossa, SCARG(uap, osa), sizeof(ossa)); if (error) return (error); } return (0); } int svr4_sys_sigaltstack(struct lwp *l, const struct svr4_sys_sigaltstack_args *uap, register_t *retval) { /* { syscallarg(const struct svr4_sigaltstack *) nss; syscallarg(struct svr4_sigaltstack *) oss; } */ compat_sigaltstack(uap, svr4_sigaltstack, SVR4_SS_ONSTACK, SVR4_SS_DISABLE); } /* * Stolen from the ibcs2 one */ int svr4_sys_signal(struct lwp *l, const struct svr4_sys_signal_args *uap, register_t *retval) { /* { syscallarg(int) signum; syscallarg(svr4_sig_t) handler; } */ int native_signo, sigcall; struct proc *p = l->l_proc; struct sigaction nbsa, obsa; sigset_t ss; int error; error = svr4_decode_signum(SCARG(uap, signum), &native_signo, &sigcall); if (error) return error; switch (sigcall) { case SVR4_SIGDEFER_MASK: if (SCARG(uap, handler) == SVR4_SIG_HOLD) goto sighold; /* FALLTHROUGH */ case SVR4_SIGNAL_MASK: nbsa.sa_handler = (sig_t)SCARG(uap, handler); sigemptyset(&nbsa.sa_mask); nbsa.sa_flags = 0; error = sigaction1(l, native_signo, &nbsa, &obsa, NULL, 0); if (error) return (error); *retval = (u_int)(u_long)obsa.sa_handler; return (0); case SVR4_SIGHOLD_MASK: sighold: sigemptyset(&ss); sigaddset(&ss, native_signo); mutex_enter(p->p_lock); error = sigprocmask1(l, SIG_BLOCK, &ss, 0); mutex_exit(p->p_lock); return error; case SVR4_SIGRELSE_MASK: sigemptyset(&ss); sigaddset(&ss, native_signo); mutex_enter(p->p_lock); error = sigprocmask1(l, SIG_UNBLOCK, &ss, 0); mutex_exit(p->p_lock); return error; case SVR4_SIGIGNORE_MASK: nbsa.sa_handler = SIG_IGN; sigemptyset(&nbsa.sa_mask); nbsa.sa_flags = 0; return (sigaction1(l, native_signo, &nbsa, 0, NULL, 0)); case SVR4_SIGPAUSE_MASK: ss = l->l_sigmask; /* XXXAD locking */ sigdelset(&ss, native_signo); return (sigsuspend1(l, &ss)); default: return (ENOSYS); } } int svr4_sys_sigprocmask(struct lwp *l, const struct svr4_sys_sigprocmask_args *uap, register_t *retval) { /* { syscallarg(int) how; syscallarg(const svr4_sigset_t *) set; syscallarg(svr4_sigset_t *) oset; } */ struct proc *p = l->l_proc; svr4_sigset_t nsss, osss; sigset_t nbss, obss; int how; int error; /* * Initialize how to 0 to avoid a compiler warning. Note that * this is safe because of the check in the default: case. */ how = 0; switch (SCARG(uap, how)) { case SVR4_SIG_BLOCK: how = SIG_BLOCK; break; case SVR4_SIG_UNBLOCK: how = SIG_UNBLOCK; break; case SVR4_SIG_SETMASK: how = SIG_SETMASK; break; default: if (SCARG(uap, set)) return EINVAL; break; } if (SCARG(uap, set)) { error = copyin(SCARG(uap, set), &nsss, sizeof(nsss)); if (error) return error; svr4_to_native_sigset(&nsss, &nbss); } mutex_enter(p->p_lock); error = sigprocmask1(l, how, SCARG(uap, set) ? &nbss : NULL, SCARG(uap, oset) ? &obss : NULL); mutex_exit(p->p_lock); if (error) return error; if (SCARG(uap, oset)) { native_to_svr4_sigset(&obss, &osss); error = copyout(&osss, SCARG(uap, oset), sizeof(osss)); if (error) return error; } return 0; } int svr4_sys_sigpending(struct lwp *l, const struct svr4_sys_sigpending_args *uap, register_t *retval) { /* { syscallarg(int) what; syscallarg(svr4_sigset_t *) set; } */ sigset_t bss; svr4_sigset_t sss; switch (SCARG(uap, what)) { case 1: /* sigpending */ sigpending1(l, &bss); native_to_svr4_sigset(&bss, &sss); break; case 2: /* sigfillset */ svr4_sigfillset(&sss); break; default: return (EINVAL); } return (copyout(&sss, SCARG(uap, set), sizeof(sss))); } int svr4_sys_sigsuspend(struct lwp *l, const struct svr4_sys_sigsuspend_args *uap, register_t *retval) { /* { syscallarg(const svr4_sigset_t *) set; } */ svr4_sigset_t sss; sigset_t bss; int error; if (SCARG(uap, set)) { error = copyin(SCARG(uap, set), &sss, sizeof(sss)); if (error) return (error); svr4_to_native_sigset(&sss, &bss); } return (sigsuspend1(l, SCARG(uap, set) ? &bss : 0)); } int svr4_sys_pause(struct lwp *l, const void *v, register_t *retval) { return (sigsuspend1(l, 0)); } int svr4_sys_kill(struct lwp *l, const struct svr4_sys_kill_args *uap, register_t *retval) { /* { syscallarg(int) pid; syscallarg(int) signum; } */ struct sys_kill_args ka; int native_signo; int error; error = svr4_decode_signum(SCARG(uap, signum), &native_signo, NULL); if (error) return error; SCARG(&ka, pid) = SCARG(uap, pid); SCARG(&ka, signum) = native_signo; return sys_kill(l, &ka, retval); } void svr4_getcontext(struct lwp *l, struct svr4_ucontext *uc) { sigset_t mask; struct proc *p = l->l_proc; svr4_getmcontext(l, &uc->uc_mcontext, &uc->uc_flags); uc->uc_link = l->l_ctxlink; /* * The (unsupplied) definition of the `current execution stack' * in the System V Interface Definition appears to allow returning * the main context stack. */ if ((l->l_sigstk.ss_flags & SS_ONSTACK) == 0) { uc->uc_stack.ss_sp = (void *)USRSTACK; uc->uc_stack.ss_size = ctob(p->p_vmspace->vm_ssize); uc->uc_stack.ss_flags = 0; /* XXX, def. is Very Fishy */ } else { /* Simply copy alternate signal execution stack. */ uc->uc_stack.ss_sp = l->l_sigstk.ss_sp; uc->uc_stack.ss_size = l->l_sigstk.ss_size; uc->uc_stack.ss_flags = l->l_sigstk.ss_flags; } (void)sigprocmask1(l, 0, NULL, &mask); native_to_svr4_sigset(&mask, &uc->uc_sigmask); uc->uc_flags |= _UC_SIGMASK | _UC_STACK; } int svr4_setcontext(struct lwp *l, struct svr4_ucontext *uc) { struct proc *p = l->l_proc; sigset_t mask; if (uc->uc_flags & _UC_SIGMASK) { svr4_to_native_sigset(&uc->uc_sigmask, &mask); mutex_enter(p->p_lock); sigprocmask1(l, SIG_SETMASK, &mask, NULL); mutex_exit(p->p_lock); } /* Ignore the stack; see comment in svr4_getcontext. */ l->l_ctxlink = uc->uc_link; svr4_setmcontext(l, &uc->uc_mcontext, uc->uc_flags); return EJUSTRETURN; } int svr4_sys_context(struct lwp *l, const struct svr4_sys_context_args *uap, register_t *retval) { /* { syscallarg(int) func; syscallarg(struct svr4_ucontext *) uc; } */ int error; svr4_ucontext_t uc; *retval = 0; memset(&uc, 0, sizeof(uc)); switch (SCARG(uap, func)) { case SVR4_GETCONTEXT: DPRINTF(("getcontext(%p)\n", SCARG(uap, uc))); svr4_getcontext(l, &uc); return (copyout(&uc, SCARG(uap, uc), sizeof (*SCARG(uap, uc)))); case SVR4_SETCONTEXT: DPRINTF(("setcontext(%p)\n", SCARG(uap, uc))); error = copyin(SCARG(uap, uc), &uc, sizeof (uc)); if (error) return (error); svr4_setcontext(l, &uc); return EJUSTRETURN; default: DPRINTF(("context(%d, %p)\n", SCARG(uap, func), SCARG(uap, uc))); return ENOSYS; } }