90d0ff41ba
Original error by: David Xu <bsddiy@yahoo.com> Fix by: David Xu <bsddiy@yahoo.com> Completely failed to spot it: Julian Elischer <julian@freebsd.org>
2173 lines
51 KiB
C
2173 lines
51 KiB
C
/*
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* Copyright (c) 1982, 1986, 1989, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_sig.c 8.7 (Berkeley) 4/18/94
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* $FreeBSD$
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*/
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#include "opt_compat.h"
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#include "opt_ktrace.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/sysproto.h>
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#include <sys/systm.h>
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#include <sys/signalvar.h>
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#include <sys/namei.h>
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#include <sys/vnode.h>
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#include <sys/event.h>
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#include <sys/proc.h>
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#include <sys/pioctl.h>
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#include <sys/acct.h>
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#include <sys/fcntl.h>
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#include <sys/condvar.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/wait.h>
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#include <sys/ktr.h>
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#include <sys/ktrace.h>
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#include <sys/resourcevar.h>
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#include <sys/smp.h>
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#include <sys/stat.h>
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#include <sys/sx.h>
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#include <sys/syslog.h>
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#include <sys/sysent.h>
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#include <sys/sysctl.h>
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#include <sys/malloc.h>
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#include <sys/unistd.h>
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#include <machine/cpu.h>
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#define ONSIG 32 /* NSIG for osig* syscalls. XXX. */
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static int coredump(struct thread *);
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static int do_sigaction(struct proc *p, int sig, struct sigaction *act,
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struct sigaction *oact, int old);
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static int do_sigprocmask(struct proc *p, int how, sigset_t *set,
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sigset_t *oset, int old);
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static char *expand_name(const char *, uid_t, pid_t);
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static int killpg1(struct thread *td, int sig, int pgid, int all);
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static int sig_ffs(sigset_t *set);
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static int sigprop(int sig);
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static void stop(struct proc *);
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static void tdsignal(struct thread *td, int sig, sig_t action);
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static int filt_sigattach(struct knote *kn);
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static void filt_sigdetach(struct knote *kn);
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static int filt_signal(struct knote *kn, long hint);
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struct filterops sig_filtops =
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{ 0, filt_sigattach, filt_sigdetach, filt_signal };
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static int kern_logsigexit = 1;
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SYSCTL_INT(_kern, KERN_LOGSIGEXIT, logsigexit, CTLFLAG_RW,
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&kern_logsigexit, 0,
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"Log processes quitting on abnormal signals to syslog(3)");
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/*
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* Policy -- Can ucred cr1 send SIGIO to process cr2?
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* Should use cr_cansignal() once cr_cansignal() allows SIGIO and SIGURG
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* in the right situations.
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*/
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#define CANSIGIO(cr1, cr2) \
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((cr1)->cr_uid == 0 || \
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(cr1)->cr_ruid == (cr2)->cr_ruid || \
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(cr1)->cr_uid == (cr2)->cr_ruid || \
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(cr1)->cr_ruid == (cr2)->cr_uid || \
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(cr1)->cr_uid == (cr2)->cr_uid)
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int sugid_coredump;
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SYSCTL_INT(_kern, OID_AUTO, sugid_coredump, CTLFLAG_RW,
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&sugid_coredump, 0, "Enable coredumping set user/group ID processes");
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static int do_coredump = 1;
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SYSCTL_INT(_kern, OID_AUTO, coredump, CTLFLAG_RW,
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&do_coredump, 0, "Enable/Disable coredumps");
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/*
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* Signal properties and actions.
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* The array below categorizes the signals and their default actions
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* according to the following properties:
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*/
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#define SA_KILL 0x01 /* terminates process by default */
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#define SA_CORE 0x02 /* ditto and coredumps */
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#define SA_STOP 0x04 /* suspend process */
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#define SA_TTYSTOP 0x08 /* ditto, from tty */
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#define SA_IGNORE 0x10 /* ignore by default */
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#define SA_CONT 0x20 /* continue if suspended */
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#define SA_CANTMASK 0x40 /* non-maskable, catchable */
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static int sigproptbl[NSIG] = {
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SA_KILL, /* SIGHUP */
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SA_KILL, /* SIGINT */
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SA_KILL|SA_CORE, /* SIGQUIT */
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SA_KILL|SA_CORE, /* SIGILL */
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SA_KILL|SA_CORE, /* SIGTRAP */
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SA_KILL|SA_CORE, /* SIGABRT */
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SA_KILL|SA_CORE, /* SIGEMT */
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SA_KILL|SA_CORE, /* SIGFPE */
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SA_KILL, /* SIGKILL */
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SA_KILL|SA_CORE, /* SIGBUS */
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SA_KILL|SA_CORE, /* SIGSEGV */
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SA_KILL|SA_CORE, /* SIGSYS */
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SA_KILL, /* SIGPIPE */
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SA_KILL, /* SIGALRM */
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SA_KILL, /* SIGTERM */
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SA_IGNORE, /* SIGURG */
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SA_STOP, /* SIGSTOP */
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SA_STOP|SA_TTYSTOP, /* SIGTSTP */
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SA_IGNORE|SA_CONT, /* SIGCONT */
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SA_IGNORE, /* SIGCHLD */
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SA_STOP|SA_TTYSTOP, /* SIGTTIN */
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SA_STOP|SA_TTYSTOP, /* SIGTTOU */
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SA_IGNORE, /* SIGIO */
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SA_KILL, /* SIGXCPU */
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SA_KILL, /* SIGXFSZ */
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SA_KILL, /* SIGVTALRM */
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SA_KILL, /* SIGPROF */
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SA_IGNORE, /* SIGWINCH */
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SA_IGNORE, /* SIGINFO */
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SA_KILL, /* SIGUSR1 */
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SA_KILL, /* SIGUSR2 */
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};
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/*
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* Determine signal that should be delivered to process p, the current
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* process, 0 if none. If there is a pending stop signal with default
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* action, the process stops in issignal().
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* XXXKSE the check for a pending stop is not done under KSE
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*
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* MP SAFE.
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*/
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int
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cursig(struct thread *td)
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{
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struct proc *p = td->td_proc;
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PROC_LOCK_ASSERT(p, MA_OWNED);
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mtx_assert(&sched_lock, MA_NOTOWNED);
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return (SIGPENDING(p) ? issignal(td) : 0);
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}
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/*
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* Arrange for ast() to handle unmasked pending signals on return to user
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* mode. This must be called whenever a signal is added to p_siglist or
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* unmasked in p_sigmask.
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*/
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void
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signotify(struct proc *p)
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{
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PROC_LOCK_ASSERT(p, MA_OWNED);
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mtx_lock_spin(&sched_lock);
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if (SIGPENDING(p)) {
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p->p_sflag |= PS_NEEDSIGCHK;
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p->p_kse.ke_flags |= KEF_ASTPENDING; /* XXXKSE */
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}
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mtx_unlock_spin(&sched_lock);
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}
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static __inline int
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sigprop(int sig)
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{
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if (sig > 0 && sig < NSIG)
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return (sigproptbl[_SIG_IDX(sig)]);
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return (0);
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}
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static __inline int
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sig_ffs(sigset_t *set)
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{
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int i;
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for (i = 0; i < _SIG_WORDS; i++)
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if (set->__bits[i])
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return (ffs(set->__bits[i]) + (i * 32));
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return (0);
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}
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/*
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* do_sigaction
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* sigaction
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* osigaction
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*/
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static int
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do_sigaction(p, sig, act, oact, old)
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struct proc *p;
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register int sig;
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struct sigaction *act, *oact;
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int old;
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{
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register struct sigacts *ps;
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if (!_SIG_VALID(sig))
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return (EINVAL);
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PROC_LOCK(p);
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ps = p->p_sigacts;
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if (oact) {
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oact->sa_handler = ps->ps_sigact[_SIG_IDX(sig)];
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oact->sa_mask = ps->ps_catchmask[_SIG_IDX(sig)];
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oact->sa_flags = 0;
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if (SIGISMEMBER(ps->ps_sigonstack, sig))
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oact->sa_flags |= SA_ONSTACK;
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if (!SIGISMEMBER(ps->ps_sigintr, sig))
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oact->sa_flags |= SA_RESTART;
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if (SIGISMEMBER(ps->ps_sigreset, sig))
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oact->sa_flags |= SA_RESETHAND;
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if (SIGISMEMBER(ps->ps_signodefer, sig))
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oact->sa_flags |= SA_NODEFER;
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if (SIGISMEMBER(ps->ps_siginfo, sig))
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oact->sa_flags |= SA_SIGINFO;
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if (sig == SIGCHLD && p->p_procsig->ps_flag & PS_NOCLDSTOP)
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oact->sa_flags |= SA_NOCLDSTOP;
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if (sig == SIGCHLD && p->p_procsig->ps_flag & PS_NOCLDWAIT)
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oact->sa_flags |= SA_NOCLDWAIT;
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}
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if (act) {
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if ((sig == SIGKILL || sig == SIGSTOP) &&
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act->sa_handler != SIG_DFL) {
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PROC_UNLOCK(p);
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return (EINVAL);
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}
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/*
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* Change setting atomically.
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*/
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ps->ps_catchmask[_SIG_IDX(sig)] = act->sa_mask;
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SIG_CANTMASK(ps->ps_catchmask[_SIG_IDX(sig)]);
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if (act->sa_flags & SA_SIGINFO) {
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ps->ps_sigact[_SIG_IDX(sig)] =
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(__sighandler_t *)act->sa_sigaction;
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SIGADDSET(ps->ps_siginfo, sig);
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} else {
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ps->ps_sigact[_SIG_IDX(sig)] = act->sa_handler;
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SIGDELSET(ps->ps_siginfo, sig);
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}
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if (!(act->sa_flags & SA_RESTART))
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SIGADDSET(ps->ps_sigintr, sig);
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else
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SIGDELSET(ps->ps_sigintr, sig);
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if (act->sa_flags & SA_ONSTACK)
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SIGADDSET(ps->ps_sigonstack, sig);
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else
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SIGDELSET(ps->ps_sigonstack, sig);
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if (act->sa_flags & SA_RESETHAND)
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SIGADDSET(ps->ps_sigreset, sig);
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else
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SIGDELSET(ps->ps_sigreset, sig);
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if (act->sa_flags & SA_NODEFER)
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SIGADDSET(ps->ps_signodefer, sig);
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else
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SIGDELSET(ps->ps_signodefer, sig);
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#ifdef COMPAT_SUNOS
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if (act->sa_flags & SA_USERTRAMP)
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SIGADDSET(ps->ps_usertramp, sig);
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else
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SIGDELSET(ps->ps_usertramp, sig);
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#endif
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if (sig == SIGCHLD) {
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if (act->sa_flags & SA_NOCLDSTOP)
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p->p_procsig->ps_flag |= PS_NOCLDSTOP;
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else
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p->p_procsig->ps_flag &= ~PS_NOCLDSTOP;
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if (act->sa_flags & SA_NOCLDWAIT) {
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/*
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* Paranoia: since SA_NOCLDWAIT is implemented
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* by reparenting the dying child to PID 1 (and
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* trust it to reap the zombie), PID 1 itself
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* is forbidden to set SA_NOCLDWAIT.
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*/
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if (p->p_pid == 1)
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p->p_procsig->ps_flag &= ~PS_NOCLDWAIT;
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else
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p->p_procsig->ps_flag |= PS_NOCLDWAIT;
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} else
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p->p_procsig->ps_flag &= ~PS_NOCLDWAIT;
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if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN)
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p->p_procsig->ps_flag |= PS_CLDSIGIGN;
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else
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p->p_procsig->ps_flag &= ~PS_CLDSIGIGN;
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}
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/*
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* Set bit in p_sigignore for signals that are set to SIG_IGN,
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* and for signals set to SIG_DFL where the default is to
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* ignore. However, don't put SIGCONT in p_sigignore, as we
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* have to restart the process.
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*/
|
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if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
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(sigprop(sig) & SA_IGNORE &&
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ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)) {
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/* never to be seen again */
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SIGDELSET(p->p_siglist, sig);
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if (sig != SIGCONT)
|
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/* easier in psignal */
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SIGADDSET(p->p_sigignore, sig);
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SIGDELSET(p->p_sigcatch, sig);
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} else {
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SIGDELSET(p->p_sigignore, sig);
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if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)
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SIGDELSET(p->p_sigcatch, sig);
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else
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SIGADDSET(p->p_sigcatch, sig);
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}
|
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#ifdef COMPAT_43
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if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
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ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL || !old)
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SIGDELSET(ps->ps_osigset, sig);
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else
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SIGADDSET(ps->ps_osigset, sig);
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#endif
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}
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PROC_UNLOCK(p);
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return (0);
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}
|
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|
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#ifndef _SYS_SYSPROTO_H_
|
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struct sigaction_args {
|
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int sig;
|
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struct sigaction *act;
|
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struct sigaction *oact;
|
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};
|
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#endif
|
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/*
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* MPSAFE
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*/
|
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/* ARGSUSED */
|
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int
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sigaction(td, uap)
|
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struct thread *td;
|
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register struct sigaction_args *uap;
|
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{
|
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struct proc *p = td->td_proc;
|
|
struct sigaction act, oact;
|
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register struct sigaction *actp, *oactp;
|
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int error;
|
|
|
|
mtx_lock(&Giant);
|
|
|
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actp = (uap->act != NULL) ? &act : NULL;
|
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oactp = (uap->oact != NULL) ? &oact : NULL;
|
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if (actp) {
|
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error = copyin(uap->act, actp, sizeof(act));
|
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if (error)
|
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goto done2;
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}
|
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error = do_sigaction(p, uap->sig, actp, oactp, 0);
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if (oactp && !error) {
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error = copyout(oactp, uap->oact, sizeof(oact));
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}
|
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done2:
|
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mtx_unlock(&Giant);
|
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return (error);
|
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}
|
|
|
|
#ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct osigaction_args {
|
|
int signum;
|
|
struct osigaction *nsa;
|
|
struct osigaction *osa;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
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osigaction(td, uap)
|
|
struct thread *td;
|
|
register struct osigaction_args *uap;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
struct osigaction sa;
|
|
struct sigaction nsa, osa;
|
|
register struct sigaction *nsap, *osap;
|
|
int error;
|
|
|
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if (uap->signum <= 0 || uap->signum >= ONSIG)
|
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return (EINVAL);
|
|
|
|
nsap = (uap->nsa != NULL) ? &nsa : NULL;
|
|
osap = (uap->osa != NULL) ? &osa : NULL;
|
|
|
|
mtx_lock(&Giant);
|
|
|
|
if (nsap) {
|
|
error = copyin(uap->nsa, &sa, sizeof(sa));
|
|
if (error)
|
|
goto done2;
|
|
nsap->sa_handler = sa.sa_handler;
|
|
nsap->sa_flags = sa.sa_flags;
|
|
OSIG2SIG(sa.sa_mask, nsap->sa_mask);
|
|
}
|
|
error = do_sigaction(p, uap->signum, nsap, osap, 1);
|
|
if (osap && !error) {
|
|
sa.sa_handler = osap->sa_handler;
|
|
sa.sa_flags = osap->sa_flags;
|
|
SIG2OSIG(osap->sa_mask, sa.sa_mask);
|
|
error = copyout(&sa, uap->osa, sizeof(sa));
|
|
}
|
|
done2:
|
|
mtx_unlock(&Giant);
|
|
return (error);
|
|
}
|
|
#endif /* COMPAT_43 */
|
|
|
|
/*
|
|
* Initialize signal state for process 0;
|
|
* set to ignore signals that are ignored by default.
|
|
*/
|
|
void
|
|
siginit(p)
|
|
struct proc *p;
|
|
{
|
|
register int i;
|
|
|
|
PROC_LOCK(p);
|
|
for (i = 1; i <= NSIG; i++)
|
|
if (sigprop(i) & SA_IGNORE && i != SIGCONT)
|
|
SIGADDSET(p->p_sigignore, i);
|
|
PROC_UNLOCK(p);
|
|
}
|
|
|
|
/*
|
|
* Reset signals for an exec of the specified process.
|
|
*/
|
|
void
|
|
execsigs(p)
|
|
register struct proc *p;
|
|
{
|
|
register struct sigacts *ps;
|
|
register int sig;
|
|
|
|
/*
|
|
* Reset caught signals. Held signals remain held
|
|
* through p_sigmask (unless they were caught,
|
|
* and are now ignored by default).
|
|
*/
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
ps = p->p_sigacts;
|
|
while (SIGNOTEMPTY(p->p_sigcatch)) {
|
|
sig = sig_ffs(&p->p_sigcatch);
|
|
SIGDELSET(p->p_sigcatch, sig);
|
|
if (sigprop(sig) & SA_IGNORE) {
|
|
if (sig != SIGCONT)
|
|
SIGADDSET(p->p_sigignore, sig);
|
|
SIGDELSET(p->p_siglist, sig);
|
|
}
|
|
ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
|
|
}
|
|
/*
|
|
* Reset stack state to the user stack.
|
|
* Clear set of signals caught on the signal stack.
|
|
*/
|
|
p->p_sigstk.ss_flags = SS_DISABLE;
|
|
p->p_sigstk.ss_size = 0;
|
|
p->p_sigstk.ss_sp = 0;
|
|
p->p_flag &= ~P_ALTSTACK;
|
|
/*
|
|
* Reset no zombies if child dies flag as Solaris does.
|
|
*/
|
|
p->p_procsig->ps_flag &= ~(PS_NOCLDWAIT | PS_CLDSIGIGN);
|
|
if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN)
|
|
ps->ps_sigact[_SIG_IDX(SIGCHLD)] = SIG_DFL;
|
|
}
|
|
|
|
/*
|
|
* do_sigprocmask()
|
|
*
|
|
* Manipulate signal mask.
|
|
*/
|
|
static int
|
|
do_sigprocmask(p, how, set, oset, old)
|
|
struct proc *p;
|
|
int how;
|
|
sigset_t *set, *oset;
|
|
int old;
|
|
{
|
|
int error;
|
|
|
|
PROC_LOCK(p);
|
|
if (oset != NULL)
|
|
*oset = p->p_sigmask;
|
|
|
|
error = 0;
|
|
if (set != NULL) {
|
|
switch (how) {
|
|
case SIG_BLOCK:
|
|
SIG_CANTMASK(*set);
|
|
SIGSETOR(p->p_sigmask, *set);
|
|
break;
|
|
case SIG_UNBLOCK:
|
|
SIGSETNAND(p->p_sigmask, *set);
|
|
signotify(p);
|
|
break;
|
|
case SIG_SETMASK:
|
|
SIG_CANTMASK(*set);
|
|
if (old)
|
|
SIGSETLO(p->p_sigmask, *set);
|
|
else
|
|
p->p_sigmask = *set;
|
|
signotify(p);
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
PROC_UNLOCK(p);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* sigprocmask() - MP SAFE (XXXKSE not under KSE it isn't)
|
|
*/
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct sigprocmask_args {
|
|
int how;
|
|
const sigset_t *set;
|
|
sigset_t *oset;
|
|
};
|
|
#endif
|
|
int
|
|
sigprocmask(td, uap)
|
|
register struct thread *td;
|
|
struct sigprocmask_args *uap;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
sigset_t set, oset;
|
|
sigset_t *setp, *osetp;
|
|
int error;
|
|
|
|
setp = (uap->set != NULL) ? &set : NULL;
|
|
osetp = (uap->oset != NULL) ? &oset : NULL;
|
|
if (setp) {
|
|
error = copyin(uap->set, setp, sizeof(set));
|
|
if (error)
|
|
return (error);
|
|
}
|
|
error = do_sigprocmask(p, uap->how, setp, osetp, 0);
|
|
if (osetp && !error) {
|
|
error = copyout(osetp, uap->oset, sizeof(oset));
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
#ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
|
|
/*
|
|
* osigprocmask() - MP SAFE
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct osigprocmask_args {
|
|
int how;
|
|
osigset_t mask;
|
|
};
|
|
#endif
|
|
int
|
|
osigprocmask(td, uap)
|
|
register struct thread *td;
|
|
struct osigprocmask_args *uap;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
sigset_t set, oset;
|
|
int error;
|
|
|
|
OSIG2SIG(uap->mask, set);
|
|
error = do_sigprocmask(p, uap->how, &set, &oset, 1);
|
|
SIG2OSIG(oset, td->td_retval[0]);
|
|
return (error);
|
|
}
|
|
#endif /* COMPAT_43 */
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct sigpending_args {
|
|
sigset_t *set;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
sigpending(td, uap)
|
|
struct thread *td;
|
|
struct sigpending_args *uap;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
sigset_t siglist;
|
|
int error;
|
|
|
|
mtx_lock(&Giant);
|
|
PROC_LOCK(p);
|
|
siglist = p->p_siglist;
|
|
PROC_UNLOCK(p);
|
|
mtx_unlock(&Giant);
|
|
error = copyout(&siglist, uap->set, sizeof(sigset_t));
|
|
return(error);
|
|
}
|
|
|
|
#ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct osigpending_args {
|
|
int dummy;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
osigpending(td, uap)
|
|
struct thread *td;
|
|
struct osigpending_args *uap;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
|
|
mtx_lock(&Giant);
|
|
PROC_LOCK(p);
|
|
SIG2OSIG(p->p_siglist, td->td_retval[0]);
|
|
PROC_UNLOCK(p);
|
|
mtx_unlock(&Giant);
|
|
return (0);
|
|
}
|
|
#endif /* COMPAT_43 */
|
|
|
|
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
|
|
/*
|
|
* Generalized interface signal handler, 4.3-compatible.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct osigvec_args {
|
|
int signum;
|
|
struct sigvec *nsv;
|
|
struct sigvec *osv;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
osigvec(td, uap)
|
|
struct thread *td;
|
|
register struct osigvec_args *uap;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
struct sigvec vec;
|
|
struct sigaction nsa, osa;
|
|
register struct sigaction *nsap, *osap;
|
|
int error;
|
|
|
|
if (uap->signum <= 0 || uap->signum >= ONSIG)
|
|
return (EINVAL);
|
|
nsap = (uap->nsv != NULL) ? &nsa : NULL;
|
|
osap = (uap->osv != NULL) ? &osa : NULL;
|
|
if (nsap) {
|
|
error = copyin(uap->nsv, &vec, sizeof(vec));
|
|
if (error)
|
|
return (error);
|
|
nsap->sa_handler = vec.sv_handler;
|
|
OSIG2SIG(vec.sv_mask, nsap->sa_mask);
|
|
nsap->sa_flags = vec.sv_flags;
|
|
nsap->sa_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */
|
|
#ifdef COMPAT_SUNOS
|
|
nsap->sa_flags |= SA_USERTRAMP;
|
|
#endif
|
|
}
|
|
mtx_lock(&Giant);
|
|
error = do_sigaction(p, uap->signum, nsap, osap, 1);
|
|
mtx_unlock(&Giant);
|
|
if (osap && !error) {
|
|
vec.sv_handler = osap->sa_handler;
|
|
SIG2OSIG(osap->sa_mask, vec.sv_mask);
|
|
vec.sv_flags = osap->sa_flags;
|
|
vec.sv_flags &= ~SA_NOCLDWAIT;
|
|
vec.sv_flags ^= SA_RESTART;
|
|
#ifdef COMPAT_SUNOS
|
|
vec.sv_flags &= ~SA_NOCLDSTOP;
|
|
#endif
|
|
error = copyout(&vec, uap->osv, sizeof(vec));
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct osigblock_args {
|
|
int mask;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
osigblock(td, uap)
|
|
register struct thread *td;
|
|
struct osigblock_args *uap;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
sigset_t set;
|
|
|
|
OSIG2SIG(uap->mask, set);
|
|
SIG_CANTMASK(set);
|
|
mtx_lock(&Giant);
|
|
PROC_LOCK(p);
|
|
SIG2OSIG(p->p_sigmask, td->td_retval[0]);
|
|
SIGSETOR(p->p_sigmask, set);
|
|
PROC_UNLOCK(p);
|
|
mtx_unlock(&Giant);
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct osigsetmask_args {
|
|
int mask;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
osigsetmask(td, uap)
|
|
struct thread *td;
|
|
struct osigsetmask_args *uap;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
sigset_t set;
|
|
|
|
OSIG2SIG(uap->mask, set);
|
|
SIG_CANTMASK(set);
|
|
mtx_lock(&Giant);
|
|
PROC_LOCK(p);
|
|
SIG2OSIG(p->p_sigmask, td->td_retval[0]);
|
|
SIGSETLO(p->p_sigmask, set);
|
|
signotify(p);
|
|
PROC_UNLOCK(p);
|
|
mtx_unlock(&Giant);
|
|
return (0);
|
|
}
|
|
#endif /* COMPAT_43 || COMPAT_SUNOS */
|
|
|
|
/*
|
|
* Suspend process until signal, providing mask to be set
|
|
* in the meantime. Note nonstandard calling convention:
|
|
* libc stub passes mask, not pointer, to save a copyin.
|
|
***** XXXKSE this doesn't make sense under KSE.
|
|
***** Do we suspend the thread or all threads in the process?
|
|
***** How do we suspend threads running NOW on another processor?
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct sigsuspend_args {
|
|
const sigset_t *sigmask;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
sigsuspend(td, uap)
|
|
struct thread *td;
|
|
struct sigsuspend_args *uap;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
sigset_t mask;
|
|
register struct sigacts *ps;
|
|
int error;
|
|
|
|
error = copyin(uap->sigmask, &mask, sizeof(mask));
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* When returning from sigsuspend, we want
|
|
* the old mask to be restored after the
|
|
* signal handler has finished. Thus, we
|
|
* save it here and mark the sigacts structure
|
|
* to indicate this.
|
|
*/
|
|
mtx_lock(&Giant);
|
|
PROC_LOCK(p);
|
|
ps = p->p_sigacts;
|
|
p->p_oldsigmask = p->p_sigmask;
|
|
p->p_flag |= P_OLDMASK;
|
|
|
|
SIG_CANTMASK(mask);
|
|
p->p_sigmask = mask;
|
|
signotify(p);
|
|
while (msleep(ps, &p->p_mtx, PPAUSE|PCATCH, "pause", 0) == 0)
|
|
/* void */;
|
|
PROC_UNLOCK(p);
|
|
mtx_unlock(&Giant);
|
|
/* always return EINTR rather than ERESTART... */
|
|
return (EINTR);
|
|
}
|
|
|
|
#ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct osigsuspend_args {
|
|
osigset_t mask;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
osigsuspend(td, uap)
|
|
struct thread *td;
|
|
struct osigsuspend_args *uap;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
sigset_t mask;
|
|
register struct sigacts *ps;
|
|
|
|
mtx_lock(&Giant);
|
|
PROC_LOCK(p);
|
|
ps = p->p_sigacts;
|
|
p->p_oldsigmask = p->p_sigmask;
|
|
p->p_flag |= P_OLDMASK;
|
|
OSIG2SIG(uap->mask, mask);
|
|
SIG_CANTMASK(mask);
|
|
SIGSETLO(p->p_sigmask, mask);
|
|
signotify(p);
|
|
while (msleep(ps, &p->p_mtx, PPAUSE|PCATCH, "opause", 0) == 0)
|
|
/* void */;
|
|
PROC_UNLOCK(p);
|
|
mtx_unlock(&Giant);
|
|
/* always return EINTR rather than ERESTART... */
|
|
return (EINTR);
|
|
}
|
|
#endif /* COMPAT_43 */
|
|
|
|
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct osigstack_args {
|
|
struct sigstack *nss;
|
|
struct sigstack *oss;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
osigstack(td, uap)
|
|
struct thread *td;
|
|
register struct osigstack_args *uap;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
struct sigstack ss;
|
|
int error = 0;
|
|
|
|
mtx_lock(&Giant);
|
|
|
|
if (uap->oss != NULL) {
|
|
PROC_LOCK(p);
|
|
ss.ss_sp = p->p_sigstk.ss_sp;
|
|
ss.ss_onstack = sigonstack(cpu_getstack(td));
|
|
PROC_UNLOCK(p);
|
|
error = copyout(&ss, uap->oss, sizeof(struct sigstack));
|
|
if (error)
|
|
goto done2;
|
|
}
|
|
|
|
if (uap->nss != NULL) {
|
|
if ((error = copyin(uap->nss, &ss, sizeof(ss))) != 0)
|
|
goto done2;
|
|
PROC_LOCK(p);
|
|
p->p_sigstk.ss_sp = ss.ss_sp;
|
|
p->p_sigstk.ss_size = 0;
|
|
p->p_sigstk.ss_flags |= ss.ss_onstack & SS_ONSTACK;
|
|
p->p_flag |= P_ALTSTACK;
|
|
PROC_UNLOCK(p);
|
|
}
|
|
done2:
|
|
mtx_unlock(&Giant);
|
|
return (error);
|
|
}
|
|
#endif /* COMPAT_43 || COMPAT_SUNOS */
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct sigaltstack_args {
|
|
stack_t *ss;
|
|
stack_t *oss;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
sigaltstack(td, uap)
|
|
struct thread *td;
|
|
register struct sigaltstack_args *uap;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
stack_t ss;
|
|
int oonstack;
|
|
int error = 0;
|
|
|
|
mtx_lock(&Giant);
|
|
|
|
oonstack = sigonstack(cpu_getstack(td));
|
|
|
|
if (uap->oss != NULL) {
|
|
PROC_LOCK(p);
|
|
ss = p->p_sigstk;
|
|
ss.ss_flags = (p->p_flag & P_ALTSTACK)
|
|
? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
|
|
PROC_UNLOCK(p);
|
|
if ((error = copyout(&ss, uap->oss, sizeof(stack_t))) != 0)
|
|
goto done2;
|
|
}
|
|
|
|
if (uap->ss != NULL) {
|
|
if (oonstack) {
|
|
error = EPERM;
|
|
goto done2;
|
|
}
|
|
if ((error = copyin(uap->ss, &ss, sizeof(ss))) != 0)
|
|
goto done2;
|
|
if ((ss.ss_flags & ~SS_DISABLE) != 0) {
|
|
error = EINVAL;
|
|
goto done2;
|
|
}
|
|
if (!(ss.ss_flags & SS_DISABLE)) {
|
|
if (ss.ss_size < p->p_sysent->sv_minsigstksz) {
|
|
error = ENOMEM;
|
|
goto done2;
|
|
}
|
|
PROC_LOCK(p);
|
|
p->p_sigstk = ss;
|
|
p->p_flag |= P_ALTSTACK;
|
|
PROC_UNLOCK(p);
|
|
} else {
|
|
PROC_LOCK(p);
|
|
p->p_flag &= ~P_ALTSTACK;
|
|
PROC_UNLOCK(p);
|
|
}
|
|
}
|
|
done2:
|
|
mtx_unlock(&Giant);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Common code for kill process group/broadcast kill.
|
|
* cp is calling process.
|
|
*/
|
|
int
|
|
killpg1(td, sig, pgid, all)
|
|
register struct thread *td;
|
|
int sig, pgid, all;
|
|
{
|
|
register struct proc *p;
|
|
struct pgrp *pgrp;
|
|
int nfound = 0;
|
|
|
|
if (all) {
|
|
/*
|
|
* broadcast
|
|
*/
|
|
sx_slock(&allproc_lock);
|
|
LIST_FOREACH(p, &allproc, p_list) {
|
|
PROC_LOCK(p);
|
|
if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
|
|
p == td->td_proc) {
|
|
PROC_UNLOCK(p);
|
|
continue;
|
|
}
|
|
if (p_cansignal(td, p, sig) == 0) {
|
|
nfound++;
|
|
if (sig)
|
|
psignal(p, sig);
|
|
}
|
|
PROC_UNLOCK(p);
|
|
}
|
|
sx_sunlock(&allproc_lock);
|
|
} else {
|
|
sx_slock(&proctree_lock);
|
|
if (pgid == 0) {
|
|
/*
|
|
* zero pgid means send to my process group.
|
|
*/
|
|
pgrp = td->td_proc->p_pgrp;
|
|
PGRP_LOCK(pgrp);
|
|
} else {
|
|
pgrp = pgfind(pgid);
|
|
if (pgrp == NULL) {
|
|
sx_sunlock(&proctree_lock);
|
|
return (ESRCH);
|
|
}
|
|
}
|
|
sx_sunlock(&proctree_lock);
|
|
LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
|
|
PROC_LOCK(p);
|
|
if (p->p_pid <= 1 || p->p_flag & P_SYSTEM) {
|
|
PROC_UNLOCK(p);
|
|
continue;
|
|
}
|
|
if (p->p_state == PRS_ZOMBIE) {
|
|
PROC_UNLOCK(p);
|
|
continue;
|
|
}
|
|
if (p_cansignal(td, p, sig) == 0) {
|
|
nfound++;
|
|
if (sig)
|
|
psignal(p, sig);
|
|
}
|
|
PROC_UNLOCK(p);
|
|
}
|
|
PGRP_UNLOCK(pgrp);
|
|
}
|
|
return (nfound ? 0 : ESRCH);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct kill_args {
|
|
int pid;
|
|
int signum;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
kill(td, uap)
|
|
register struct thread *td;
|
|
register struct kill_args *uap;
|
|
{
|
|
register struct proc *p;
|
|
int error = 0;
|
|
|
|
if ((u_int)uap->signum > _SIG_MAXSIG)
|
|
return (EINVAL);
|
|
|
|
mtx_lock(&Giant);
|
|
if (uap->pid > 0) {
|
|
/* kill single process */
|
|
if ((p = pfind(uap->pid)) == NULL) {
|
|
error = ESRCH;
|
|
} else if ((error = p_cansignal(td, p, uap->signum)) != 0) {
|
|
PROC_UNLOCK(p);
|
|
} else {
|
|
if (uap->signum)
|
|
psignal(p, uap->signum);
|
|
PROC_UNLOCK(p);
|
|
error = 0;
|
|
}
|
|
} else {
|
|
switch (uap->pid) {
|
|
case -1: /* broadcast signal */
|
|
error = killpg1(td, uap->signum, 0, 1);
|
|
break;
|
|
case 0: /* signal own process group */
|
|
error = killpg1(td, uap->signum, 0, 0);
|
|
break;
|
|
default: /* negative explicit process group */
|
|
error = killpg1(td, uap->signum, -uap->pid, 0);
|
|
break;
|
|
}
|
|
}
|
|
mtx_unlock(&Giant);
|
|
return(error);
|
|
}
|
|
|
|
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct okillpg_args {
|
|
int pgid;
|
|
int signum;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
okillpg(td, uap)
|
|
struct thread *td;
|
|
register struct okillpg_args *uap;
|
|
{
|
|
int error;
|
|
|
|
if ((u_int)uap->signum > _SIG_MAXSIG)
|
|
return (EINVAL);
|
|
mtx_lock(&Giant);
|
|
error = killpg1(td, uap->signum, uap->pgid, 0);
|
|
mtx_unlock(&Giant);
|
|
return (error);
|
|
}
|
|
#endif /* COMPAT_43 || COMPAT_SUNOS */
|
|
|
|
/*
|
|
* Send a signal to a process group.
|
|
*/
|
|
void
|
|
gsignal(pgid, sig)
|
|
int pgid, sig;
|
|
{
|
|
struct pgrp *pgrp;
|
|
|
|
if (pgid != 0) {
|
|
sx_slock(&proctree_lock);
|
|
pgrp = pgfind(pgid);
|
|
sx_sunlock(&proctree_lock);
|
|
if (pgrp != NULL) {
|
|
pgsignal(pgrp, sig, 0);
|
|
PGRP_UNLOCK(pgrp);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Send a signal to a process group. If checktty is 1,
|
|
* limit to members which have a controlling terminal.
|
|
*/
|
|
void
|
|
pgsignal(pgrp, sig, checkctty)
|
|
struct pgrp *pgrp;
|
|
int sig, checkctty;
|
|
{
|
|
register struct proc *p;
|
|
|
|
if (pgrp) {
|
|
PGRP_LOCK_ASSERT(pgrp, MA_OWNED);
|
|
LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
|
|
PROC_LOCK(p);
|
|
if (checkctty == 0 || p->p_flag & P_CONTROLT)
|
|
psignal(p, sig);
|
|
PROC_UNLOCK(p);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Send a signal caused by a trap to the current process.
|
|
* If it will be caught immediately, deliver it with correct code.
|
|
* Otherwise, post it normally.
|
|
*
|
|
* MPSAFE
|
|
*/
|
|
void
|
|
trapsignal(p, sig, code)
|
|
struct proc *p;
|
|
register int sig;
|
|
u_long code;
|
|
{
|
|
register struct sigacts *ps = p->p_sigacts;
|
|
|
|
PROC_LOCK(p);
|
|
if ((p->p_flag & P_TRACED) == 0 && SIGISMEMBER(p->p_sigcatch, sig) &&
|
|
!SIGISMEMBER(p->p_sigmask, sig)) {
|
|
p->p_stats->p_ru.ru_nsignals++;
|
|
#ifdef KTRACE
|
|
if (KTRPOINT(curthread, KTR_PSIG))
|
|
ktrpsig(sig, ps->ps_sigact[_SIG_IDX(sig)],
|
|
&p->p_sigmask, code);
|
|
#endif
|
|
(*p->p_sysent->sv_sendsig)(ps->ps_sigact[_SIG_IDX(sig)], sig,
|
|
&p->p_sigmask, code);
|
|
SIGSETOR(p->p_sigmask, ps->ps_catchmask[_SIG_IDX(sig)]);
|
|
if (!SIGISMEMBER(ps->ps_signodefer, sig))
|
|
SIGADDSET(p->p_sigmask, sig);
|
|
if (SIGISMEMBER(ps->ps_sigreset, sig)) {
|
|
/*
|
|
* See do_sigaction() for origin of this code.
|
|
*/
|
|
SIGDELSET(p->p_sigcatch, sig);
|
|
if (sig != SIGCONT &&
|
|
sigprop(sig) & SA_IGNORE)
|
|
SIGADDSET(p->p_sigignore, sig);
|
|
ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
|
|
}
|
|
} else {
|
|
p->p_code = code; /* XXX for core dump/debugger */
|
|
p->p_sig = sig; /* XXX to verify code */
|
|
psignal(p, sig);
|
|
}
|
|
PROC_UNLOCK(p);
|
|
}
|
|
|
|
/*
|
|
* Send the signal to the process. If the signal has an action, the action
|
|
* is usually performed by the target process rather than the caller; we add
|
|
* the signal to the set of pending signals for the process.
|
|
*
|
|
* Exceptions:
|
|
* o When a stop signal is sent to a sleeping process that takes the
|
|
* default action, the process is stopped without awakening it.
|
|
* o SIGCONT restarts stopped processes (or puts them back to sleep)
|
|
* regardless of the signal action (eg, blocked or ignored).
|
|
*
|
|
* Other ignored signals are discarded immediately.
|
|
*/
|
|
void
|
|
psignal(p, sig)
|
|
register struct proc *p;
|
|
register int sig;
|
|
{
|
|
register sig_t action;
|
|
struct thread *td;
|
|
register int prop;
|
|
|
|
|
|
KASSERT(_SIG_VALID(sig),
|
|
("psignal(): invalid signal %d\n", sig));
|
|
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
KNOTE(&p->p_klist, NOTE_SIGNAL | sig);
|
|
|
|
prop = sigprop(sig);
|
|
/*
|
|
* If proc is traced, always give parent a chance;
|
|
* if signal event is tracked by procfs, give *that*
|
|
* a chance, as well.
|
|
*/
|
|
if ((p->p_flag & P_TRACED) || (p->p_stops & S_SIG)) {
|
|
action = SIG_DFL;
|
|
} else {
|
|
/*
|
|
* If the signal is being ignored,
|
|
* then we forget about it immediately.
|
|
* (Note: we don't set SIGCONT in p_sigignore,
|
|
* and if it is set to SIG_IGN,
|
|
* action will be SIG_DFL here.)
|
|
*/
|
|
if (SIGISMEMBER(p->p_sigignore, sig) || (p->p_flag & P_WEXIT))
|
|
return;
|
|
if (SIGISMEMBER(p->p_sigmask, sig))
|
|
action = SIG_HOLD;
|
|
else if (SIGISMEMBER(p->p_sigcatch, sig))
|
|
action = SIG_CATCH;
|
|
else
|
|
action = SIG_DFL;
|
|
}
|
|
|
|
if (prop & SA_CONT)
|
|
SIG_STOPSIGMASK(p->p_siglist);
|
|
|
|
if (prop & SA_STOP) {
|
|
/*
|
|
* If sending a tty stop signal to a member of an orphaned
|
|
* process group, discard the signal here if the action
|
|
* is default; don't stop the process below if sleeping,
|
|
* and don't clear any pending SIGCONT.
|
|
*/
|
|
if ((prop & SA_TTYSTOP) &&
|
|
(p->p_pgrp->pg_jobc == 0) &&
|
|
(action == SIG_DFL))
|
|
return;
|
|
SIG_CONTSIGMASK(p->p_siglist);
|
|
p->p_flag &= ~P_CONTINUED;
|
|
}
|
|
SIGADDSET(p->p_siglist, sig);
|
|
signotify(p); /* uses schedlock */
|
|
|
|
/*
|
|
* Some signals have a process-wide effect and a per-thread
|
|
* component. Most processing occurs when the process next
|
|
* tries to cross the user boundary, however there are some
|
|
* times when processing needs to be done immediatly, such as
|
|
* waking up threads so that they can cross the user boundary.
|
|
* We try do the per-process part here.
|
|
*/
|
|
if (P_SHOULDSTOP(p)) {
|
|
/*
|
|
* The process is in stopped mode. All the threads should be
|
|
* either winding down or already on the suspended queue.
|
|
*/
|
|
if (p->p_flag & P_TRACED) {
|
|
/*
|
|
* The traced process is already stopped,
|
|
* so no further action is necessary.
|
|
* No signal can restart us.
|
|
*/
|
|
goto out;
|
|
}
|
|
|
|
if (sig == SIGKILL) {
|
|
/*
|
|
* SIGKILL sets process running.
|
|
* It will die elsewhere.
|
|
* All threads must be restarted.
|
|
*/
|
|
p->p_flag &= ~P_STOPPED;
|
|
goto runfast;
|
|
}
|
|
|
|
if (prop & SA_CONT) {
|
|
/*
|
|
* If SIGCONT is default (or ignored), we continue the
|
|
* process but don't leave the signal in p_siglist as
|
|
* it has no further action. If SIGCONT is held, we
|
|
* continue the process and leave the signal in
|
|
* p_siglist. If the process catches SIGCONT, let it
|
|
* handle the signal itself. If it isn't waiting on
|
|
* an event, it goes back to run state.
|
|
* Otherwise, process goes back to sleep state.
|
|
*/
|
|
p->p_flag &= ~P_STOPPED_SGNL;
|
|
p->p_flag |= P_CONTINUED;
|
|
if (action == SIG_DFL) {
|
|
SIGDELSET(p->p_siglist, sig);
|
|
} else if (action == SIG_CATCH) {
|
|
/*
|
|
* The process wants to catch it so it needs
|
|
* to run at least one thread, but which one?
|
|
* It would seem that the answer would be to
|
|
* run an upcall in the next KSE to run, and
|
|
* deliver the signal that way. In a NON KSE
|
|
* process, we need to make sure that the
|
|
* single thread is runnable asap.
|
|
* XXXKSE for now however, make them all run.
|
|
*/
|
|
goto runfast;
|
|
}
|
|
/*
|
|
* The signal is not ignored or caught.
|
|
*/
|
|
mtx_lock_spin(&sched_lock);
|
|
thread_unsuspend(p);
|
|
mtx_unlock_spin(&sched_lock);
|
|
goto out;
|
|
}
|
|
|
|
if (prop & SA_STOP) {
|
|
/*
|
|
* Already stopped, don't need to stop again
|
|
* (If we did the shell could get confused).
|
|
* Just make sure the signal STOP bit set.
|
|
*/
|
|
p->p_flag |= P_STOPPED_SGNL;
|
|
SIGDELSET(p->p_siglist, sig);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* All other kinds of signals:
|
|
* If a thread is sleeping interruptibly, simulate a
|
|
* wakeup so that when it is continued it will be made
|
|
* runnable and can look at the signal. However, don't make
|
|
* the PROCESS runnable, leave it stopped.
|
|
* It may run a bit until it hits a thread_suspend_check().
|
|
*/
|
|
mtx_lock_spin(&sched_lock);
|
|
FOREACH_THREAD_IN_PROC(p, td) {
|
|
if (td->td_wchan && (td->td_flags & TDF_SINTR)) {
|
|
if (td->td_flags & TDF_CVWAITQ)
|
|
cv_waitq_remove(td);
|
|
else
|
|
unsleep(td);
|
|
setrunnable(td);
|
|
}
|
|
}
|
|
mtx_unlock_spin(&sched_lock);
|
|
goto out;
|
|
/*
|
|
* XXXKSE What about threads that are waiting on mutexes?
|
|
* Shouldn't they abort too?
|
|
* No, hopefully mutexes are short lived.. They'll
|
|
* eventually hit thread_suspend_check().
|
|
*/
|
|
} else if (p->p_state == PRS_NORMAL) {
|
|
if (prop & SA_CONT) {
|
|
/*
|
|
* Already active, don't need to start again.
|
|
*/
|
|
SIGDELSET(p->p_siglist, sig);
|
|
goto out;
|
|
}
|
|
if (prop & SA_STOP) {
|
|
mtx_lock_spin(&sched_lock);
|
|
FOREACH_THREAD_IN_PROC(p, td)
|
|
tdsignal(td, sig, action);
|
|
mtx_unlock_spin(&sched_lock);
|
|
goto out;
|
|
}
|
|
else
|
|
goto runfast;
|
|
/* NOTREACHED */
|
|
} else {
|
|
/* Not in "NORMAL" state. discard the signal. */
|
|
SIGDELSET(p->p_siglist, sig);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* The process is not stopped so we need to apply the signal to all the
|
|
* running threads.
|
|
*/
|
|
|
|
runfast:
|
|
mtx_lock_spin(&sched_lock);
|
|
FOREACH_THREAD_IN_PROC(p, td)
|
|
tdsignal(td, sig, action);
|
|
thread_unsuspend(p);
|
|
mtx_unlock_spin(&sched_lock);
|
|
out:
|
|
/* If we jump here, sched_lock should not be owned. */
|
|
mtx_assert(&sched_lock, MA_NOTOWNED);
|
|
}
|
|
|
|
/*
|
|
* The force of a signal has been directed against a single
|
|
* thread. We need to see what we can do about knocking it
|
|
* out of any sleep it may be in etc.
|
|
*/
|
|
static void
|
|
tdsignal(struct thread *td, int sig, sig_t action)
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
register int prop;
|
|
|
|
mtx_assert(&sched_lock, MA_OWNED);
|
|
prop = sigprop(sig);
|
|
/*
|
|
* Bring the priority of a thread up if we want it to get
|
|
* killed in this lifetime.
|
|
*/
|
|
if ((action == SIG_DFL) && (prop & SA_KILL)) {
|
|
if (td->td_priority > PUSER) {
|
|
td->td_priority = PUSER;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Defer further processing for signals which are held,
|
|
* except that stopped processes must be continued by SIGCONT.
|
|
*/
|
|
if (action == SIG_HOLD) {
|
|
return;
|
|
}
|
|
if (td->td_state == TDS_SLP) {
|
|
/*
|
|
* If thread is sleeping uninterruptibly
|
|
* we can't interrupt the sleep... the signal will
|
|
* be noticed when the process returns through
|
|
* trap() or syscall().
|
|
*/
|
|
if ((td->td_flags & TDF_SINTR) == 0) {
|
|
return;
|
|
}
|
|
/*
|
|
* Process is sleeping and traced. Make it runnable
|
|
* so it can discover the signal in issignal() and stop
|
|
* for its parent.
|
|
*/
|
|
if (p->p_flag & P_TRACED) {
|
|
p->p_flag &= ~P_STOPPED_TRACE;
|
|
} else {
|
|
|
|
/*
|
|
* If SIGCONT is default (or ignored) and process is
|
|
* asleep, we are finished; the process should not
|
|
* be awakened.
|
|
*/
|
|
if ((prop & SA_CONT) && action == SIG_DFL) {
|
|
SIGDELSET(p->p_siglist, sig);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Raise priority to at least PUSER.
|
|
*/
|
|
if (td->td_priority > PUSER) {
|
|
td->td_priority = PUSER;
|
|
}
|
|
}
|
|
setrunnable(td);
|
|
}
|
|
#ifdef SMP
|
|
else {
|
|
/*
|
|
* Other states do nothing with the signal immediatly,
|
|
* other than kicking ourselves if we are running.
|
|
* It will either never be noticed, or noticed very soon.
|
|
*/
|
|
if (td->td_state == TDS_RUNNING && td != curthread) {
|
|
forward_signal(td);
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* If the current process has received a signal (should be caught or cause
|
|
* termination, should interrupt current syscall), return the signal number.
|
|
* Stop signals with default action are processed immediately, then cleared;
|
|
* they aren't returned. This is checked after each entry to the system for
|
|
* a syscall or trap (though this can usually be done without calling issignal
|
|
* by checking the pending signal masks in cursig.) The normal call
|
|
* sequence is
|
|
*
|
|
* while (sig = cursig(curthread))
|
|
* postsig(sig);
|
|
*/
|
|
int
|
|
issignal(td)
|
|
struct thread *td;
|
|
{
|
|
struct proc *p;
|
|
sigset_t mask;
|
|
register int sig, prop;
|
|
|
|
p = td->td_proc;
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
for (;;) {
|
|
int traced = (p->p_flag & P_TRACED) || (p->p_stops & S_SIG);
|
|
|
|
mask = p->p_siglist;
|
|
SIGSETNAND(mask, p->p_sigmask);
|
|
if (p->p_flag & P_PPWAIT)
|
|
SIG_STOPSIGMASK(mask);
|
|
if (SIGISEMPTY(mask)) /* no signal to send */
|
|
return (0);
|
|
sig = sig_ffs(&mask);
|
|
prop = sigprop(sig);
|
|
|
|
_STOPEVENT(p, S_SIG, sig);
|
|
|
|
/*
|
|
* We should see pending but ignored signals
|
|
* only if P_TRACED was on when they were posted.
|
|
*/
|
|
if (SIGISMEMBER(p->p_sigignore, sig) && (traced == 0)) {
|
|
SIGDELSET(p->p_siglist, sig);
|
|
continue;
|
|
}
|
|
if (p->p_flag & P_TRACED && (p->p_flag & P_PPWAIT) == 0) {
|
|
/*
|
|
* If traced, always stop.
|
|
*/
|
|
p->p_xstat = sig;
|
|
PROC_LOCK(p->p_pptr);
|
|
psignal(p->p_pptr, SIGCHLD);
|
|
PROC_UNLOCK(p->p_pptr);
|
|
mtx_lock_spin(&sched_lock);
|
|
stop(p); /* uses schedlock too eventually */
|
|
td->td_state = TDS_UNQUEUED;
|
|
PROC_UNLOCK(p);
|
|
DROP_GIANT();
|
|
p->p_stats->p_ru.ru_nivcsw++;
|
|
mi_switch();
|
|
mtx_unlock_spin(&sched_lock);
|
|
PICKUP_GIANT();
|
|
PROC_LOCK(p);
|
|
|
|
/*
|
|
* If the traced bit got turned off, go back up
|
|
* to the top to rescan signals. This ensures
|
|
* that p_sig* and ps_sigact are consistent.
|
|
*/
|
|
if ((p->p_flag & P_TRACED) == 0)
|
|
continue;
|
|
|
|
/*
|
|
* If parent wants us to take the signal,
|
|
* then it will leave it in p->p_xstat;
|
|
* otherwise we just look for signals again.
|
|
*/
|
|
SIGDELSET(p->p_siglist, sig); /* clear old signal */
|
|
sig = p->p_xstat;
|
|
if (sig == 0)
|
|
continue;
|
|
|
|
/*
|
|
* Put the new signal into p_siglist. If the
|
|
* signal is being masked, look for other signals.
|
|
*/
|
|
SIGADDSET(p->p_siglist, sig);
|
|
if (SIGISMEMBER(p->p_sigmask, sig))
|
|
continue;
|
|
signotify(p);
|
|
}
|
|
|
|
/*
|
|
* Decide whether the signal should be returned.
|
|
* Return the signal's number, or fall through
|
|
* to clear it from the pending mask.
|
|
*/
|
|
switch ((int)(intptr_t)p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) {
|
|
|
|
case (int)SIG_DFL:
|
|
/*
|
|
* Don't take default actions on system processes.
|
|
*/
|
|
if (p->p_pid <= 1) {
|
|
#ifdef DIAGNOSTIC
|
|
/*
|
|
* Are you sure you want to ignore SIGSEGV
|
|
* in init? XXX
|
|
*/
|
|
printf("Process (pid %lu) got signal %d\n",
|
|
(u_long)p->p_pid, sig);
|
|
#endif
|
|
break; /* == ignore */
|
|
}
|
|
/*
|
|
* If there is a pending stop signal to process
|
|
* with default action, stop here,
|
|
* then clear the signal. However,
|
|
* if process is member of an orphaned
|
|
* process group, ignore tty stop signals.
|
|
*/
|
|
if (prop & SA_STOP) {
|
|
WITNESS_SLEEP(1, &p->p_mtx.mtx_object);
|
|
if (p->p_flag & P_TRACED ||
|
|
(p->p_pgrp->pg_jobc == 0 &&
|
|
prop & SA_TTYSTOP))
|
|
break; /* == ignore */
|
|
p->p_xstat = sig;
|
|
mtx_lock_spin(&sched_lock);
|
|
if (p->p_suspcount+1 == p->p_numthreads) {
|
|
mtx_unlock_spin(&sched_lock);
|
|
PROC_LOCK(p->p_pptr);
|
|
if ((p->p_pptr->p_procsig->ps_flag &
|
|
PS_NOCLDSTOP) == 0) {
|
|
psignal(p->p_pptr, SIGCHLD);
|
|
}
|
|
PROC_UNLOCK(p->p_pptr);
|
|
mtx_lock_spin(&sched_lock);
|
|
}
|
|
stop(p);
|
|
p->p_suspcount++;
|
|
td->td_state = TDS_SUSPENDED;
|
|
TAILQ_INSERT_TAIL(&p->p_suspended, td, td_runq);
|
|
PROC_UNLOCK(p);
|
|
DROP_GIANT();
|
|
p->p_stats->p_ru.ru_nivcsw++;
|
|
mi_switch();
|
|
mtx_unlock_spin(&sched_lock);
|
|
PICKUP_GIANT();
|
|
PROC_LOCK(p);
|
|
break;
|
|
} else
|
|
if (prop & SA_IGNORE) {
|
|
/*
|
|
* Except for SIGCONT, shouldn't get here.
|
|
* Default action is to ignore; drop it.
|
|
*/
|
|
break; /* == ignore */
|
|
} else
|
|
return (sig);
|
|
/*NOTREACHED*/
|
|
|
|
case (int)SIG_IGN:
|
|
/*
|
|
* Masking above should prevent us ever trying
|
|
* to take action on an ignored signal other
|
|
* than SIGCONT, unless process is traced.
|
|
*/
|
|
if ((prop & SA_CONT) == 0 &&
|
|
(p->p_flag & P_TRACED) == 0)
|
|
printf("issignal\n");
|
|
break; /* == ignore */
|
|
|
|
default:
|
|
/*
|
|
* This signal has an action, let
|
|
* postsig() process it.
|
|
*/
|
|
return (sig);
|
|
}
|
|
SIGDELSET(p->p_siglist, sig); /* take the signal! */
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Put the argument process into the stopped state and notify the parent
|
|
* via wakeup. Signals are handled elsewhere. The process must not be
|
|
* on the run queue. Must be called with the proc p locked and the scheduler
|
|
* lock held.
|
|
*/
|
|
static void
|
|
stop(p)
|
|
register struct proc *p;
|
|
{
|
|
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
p->p_flag |= P_STOPPED_SGNL;
|
|
p->p_flag &= ~P_WAITED;
|
|
wakeup(p->p_pptr);
|
|
}
|
|
|
|
/*
|
|
* Take the action for the specified signal
|
|
* from the current set of pending signals.
|
|
*/
|
|
void
|
|
postsig(sig)
|
|
register int sig;
|
|
{
|
|
struct thread *td = curthread;
|
|
register struct proc *p = td->td_proc;
|
|
struct sigacts *ps;
|
|
sig_t action;
|
|
sigset_t returnmask;
|
|
int code;
|
|
|
|
KASSERT(sig != 0, ("postsig"));
|
|
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
ps = p->p_sigacts;
|
|
SIGDELSET(p->p_siglist, sig);
|
|
action = ps->ps_sigact[_SIG_IDX(sig)];
|
|
#ifdef KTRACE
|
|
if (KTRPOINT(td, KTR_PSIG))
|
|
ktrpsig(sig, action, p->p_flag & P_OLDMASK ?
|
|
&p->p_oldsigmask : &p->p_sigmask, 0);
|
|
#endif
|
|
_STOPEVENT(p, S_SIG, sig);
|
|
|
|
if (action == SIG_DFL) {
|
|
/*
|
|
* Default action, where the default is to kill
|
|
* the process. (Other cases were ignored above.)
|
|
*/
|
|
sigexit(td, sig);
|
|
/* NOTREACHED */
|
|
} else {
|
|
/*
|
|
* If we get here, the signal must be caught.
|
|
*/
|
|
KASSERT(action != SIG_IGN && !SIGISMEMBER(p->p_sigmask, sig),
|
|
("postsig action"));
|
|
/*
|
|
* Set the new mask value and also defer further
|
|
* occurrences of this signal.
|
|
*
|
|
* Special case: user has done a sigsuspend. Here the
|
|
* current mask is not of interest, but rather the
|
|
* mask from before the sigsuspend is what we want
|
|
* restored after the signal processing is completed.
|
|
*/
|
|
if (p->p_flag & P_OLDMASK) {
|
|
returnmask = p->p_oldsigmask;
|
|
p->p_flag &= ~P_OLDMASK;
|
|
} else
|
|
returnmask = p->p_sigmask;
|
|
|
|
SIGSETOR(p->p_sigmask, ps->ps_catchmask[_SIG_IDX(sig)]);
|
|
if (!SIGISMEMBER(ps->ps_signodefer, sig))
|
|
SIGADDSET(p->p_sigmask, sig);
|
|
|
|
if (SIGISMEMBER(ps->ps_sigreset, sig)) {
|
|
/*
|
|
* See do_sigaction() for origin of this code.
|
|
*/
|
|
SIGDELSET(p->p_sigcatch, sig);
|
|
if (sig != SIGCONT &&
|
|
sigprop(sig) & SA_IGNORE)
|
|
SIGADDSET(p->p_sigignore, sig);
|
|
ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
|
|
}
|
|
p->p_stats->p_ru.ru_nsignals++;
|
|
if (p->p_sig != sig) {
|
|
code = 0;
|
|
} else {
|
|
code = p->p_code;
|
|
p->p_code = 0;
|
|
p->p_sig = 0;
|
|
}
|
|
(*p->p_sysent->sv_sendsig)(action, sig, &returnmask, code);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Kill the current process for stated reason.
|
|
*/
|
|
void
|
|
killproc(p, why)
|
|
struct proc *p;
|
|
char *why;
|
|
{
|
|
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
CTR3(KTR_PROC, "killproc: proc %p (pid %d, %s)",
|
|
p, p->p_pid, p->p_comm);
|
|
log(LOG_ERR, "pid %d (%s), uid %d, was killed: %s\n", p->p_pid, p->p_comm,
|
|
p->p_ucred ? p->p_ucred->cr_uid : -1, why);
|
|
psignal(p, SIGKILL);
|
|
}
|
|
|
|
/*
|
|
* Force the current process to exit with the specified signal, dumping core
|
|
* if appropriate. We bypass the normal tests for masked and caught signals,
|
|
* allowing unrecoverable failures to terminate the process without changing
|
|
* signal state. Mark the accounting record with the signal termination.
|
|
* If dumping core, save the signal number for the debugger. Calls exit and
|
|
* does not return.
|
|
*/
|
|
void
|
|
sigexit(td, sig)
|
|
struct thread *td;
|
|
int sig;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
p->p_acflag |= AXSIG;
|
|
if (sigprop(sig) & SA_CORE) {
|
|
p->p_sig = sig;
|
|
/*
|
|
* Log signals which would cause core dumps
|
|
* (Log as LOG_INFO to appease those who don't want
|
|
* these messages.)
|
|
* XXX : Todo, as well as euid, write out ruid too
|
|
*/
|
|
PROC_UNLOCK(p);
|
|
if (!mtx_owned(&Giant))
|
|
mtx_lock(&Giant);
|
|
if (coredump(td) == 0)
|
|
sig |= WCOREFLAG;
|
|
if (kern_logsigexit)
|
|
log(LOG_INFO,
|
|
"pid %d (%s), uid %d: exited on signal %d%s\n",
|
|
p->p_pid, p->p_comm,
|
|
td->td_ucred ? td->td_ucred->cr_uid : -1,
|
|
sig &~ WCOREFLAG,
|
|
sig & WCOREFLAG ? " (core dumped)" : "");
|
|
} else {
|
|
PROC_UNLOCK(p);
|
|
if (!mtx_owned(&Giant))
|
|
mtx_lock(&Giant);
|
|
}
|
|
exit1(td, W_EXITCODE(0, sig));
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static char corefilename[MAXPATHLEN+1] = {"%N.core"};
|
|
SYSCTL_STRING(_kern, OID_AUTO, corefile, CTLFLAG_RW, corefilename,
|
|
sizeof(corefilename), "process corefile name format string");
|
|
|
|
/*
|
|
* expand_name(name, uid, pid)
|
|
* Expand the name described in corefilename, using name, uid, and pid.
|
|
* corefilename is a printf-like string, with three format specifiers:
|
|
* %N name of process ("name")
|
|
* %P process id (pid)
|
|
* %U user id (uid)
|
|
* For example, "%N.core" is the default; they can be disabled completely
|
|
* by using "/dev/null", or all core files can be stored in "/cores/%U/%N-%P".
|
|
* This is controlled by the sysctl variable kern.corefile (see above).
|
|
*/
|
|
|
|
static char *
|
|
expand_name(name, uid, pid)
|
|
const char *name;
|
|
uid_t uid;
|
|
pid_t pid;
|
|
{
|
|
const char *format, *appendstr;
|
|
char *temp;
|
|
char buf[11]; /* Buffer for pid/uid -- max 4B */
|
|
size_t i, l, n;
|
|
|
|
format = corefilename;
|
|
temp = malloc(MAXPATHLEN, M_TEMP, M_NOWAIT | M_ZERO);
|
|
if (temp == NULL)
|
|
return (NULL);
|
|
for (i = 0, n = 0; n < MAXPATHLEN && format[i]; i++) {
|
|
switch (format[i]) {
|
|
case '%': /* Format character */
|
|
i++;
|
|
switch (format[i]) {
|
|
case '%':
|
|
appendstr = "%";
|
|
break;
|
|
case 'N': /* process name */
|
|
appendstr = name;
|
|
break;
|
|
case 'P': /* process id */
|
|
sprintf(buf, "%u", pid);
|
|
appendstr = buf;
|
|
break;
|
|
case 'U': /* user id */
|
|
sprintf(buf, "%u", uid);
|
|
appendstr = buf;
|
|
break;
|
|
default:
|
|
appendstr = "";
|
|
log(LOG_ERR,
|
|
"Unknown format character %c in `%s'\n",
|
|
format[i], format);
|
|
}
|
|
l = strlen(appendstr);
|
|
if ((n + l) >= MAXPATHLEN)
|
|
goto toolong;
|
|
memcpy(temp + n, appendstr, l);
|
|
n += l;
|
|
break;
|
|
default:
|
|
temp[n++] = format[i];
|
|
}
|
|
}
|
|
if (format[i] != '\0')
|
|
goto toolong;
|
|
return (temp);
|
|
toolong:
|
|
log(LOG_ERR, "pid %ld (%s), uid (%lu): corename is too long\n",
|
|
(long)pid, name, (u_long)uid);
|
|
free(temp, M_TEMP);
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Dump a process' core. The main routine does some
|
|
* policy checking, and creates the name of the coredump;
|
|
* then it passes on a vnode and a size limit to the process-specific
|
|
* coredump routine if there is one; if there _is not_ one, it returns
|
|
* ENOSYS; otherwise it returns the error from the process-specific routine.
|
|
*/
|
|
|
|
static int
|
|
coredump(struct thread *td)
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
register struct vnode *vp;
|
|
register struct ucred *cred = td->td_ucred;
|
|
struct flock lf;
|
|
struct nameidata nd;
|
|
struct vattr vattr;
|
|
int error, error1, flags;
|
|
struct mount *mp;
|
|
char *name; /* name of corefile */
|
|
off_t limit;
|
|
|
|
PROC_LOCK(p);
|
|
_STOPEVENT(p, S_CORE, 0);
|
|
|
|
if (((sugid_coredump == 0) && p->p_flag & P_SUGID) || do_coredump == 0) {
|
|
PROC_UNLOCK(p);
|
|
return (EFAULT);
|
|
}
|
|
|
|
/*
|
|
* Note that the bulk of limit checking is done after
|
|
* the corefile is created. The exception is if the limit
|
|
* for corefiles is 0, in which case we don't bother
|
|
* creating the corefile at all. This layout means that
|
|
* a corefile is truncated instead of not being created,
|
|
* if it is larger than the limit.
|
|
*/
|
|
limit = p->p_rlimit[RLIMIT_CORE].rlim_cur;
|
|
if (limit == 0) {
|
|
PROC_UNLOCK(p);
|
|
return 0;
|
|
}
|
|
PROC_UNLOCK(p);
|
|
|
|
restart:
|
|
name = expand_name(p->p_comm, td->td_ucred->cr_uid, p->p_pid);
|
|
if (name == NULL)
|
|
return (EINVAL);
|
|
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name, td); /* XXXKSE */
|
|
flags = O_CREAT | FWRITE | O_NOFOLLOW;
|
|
error = vn_open(&nd, &flags, S_IRUSR | S_IWUSR);
|
|
free(name, M_TEMP);
|
|
if (error)
|
|
return (error);
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
vp = nd.ni_vp;
|
|
|
|
/* Don't dump to non-regular files or files with links. */
|
|
if (vp->v_type != VREG ||
|
|
VOP_GETATTR(vp, &vattr, cred, td) || vattr.va_nlink != 1) {
|
|
VOP_UNLOCK(vp, 0, td);
|
|
error = EFAULT;
|
|
goto out2;
|
|
}
|
|
|
|
VOP_UNLOCK(vp, 0, td);
|
|
lf.l_whence = SEEK_SET;
|
|
lf.l_start = 0;
|
|
lf.l_len = 0;
|
|
lf.l_type = F_WRLCK;
|
|
error = VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &lf, F_FLOCK);
|
|
if (error)
|
|
goto out2;
|
|
|
|
if (vn_start_write(vp, &mp, V_NOWAIT) != 0) {
|
|
lf.l_type = F_UNLCK;
|
|
VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_FLOCK);
|
|
if ((error = vn_close(vp, FWRITE, cred, td)) != 0)
|
|
return (error);
|
|
if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0)
|
|
return (error);
|
|
goto restart;
|
|
}
|
|
|
|
VATTR_NULL(&vattr);
|
|
vattr.va_size = 0;
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
VOP_LEASE(vp, td, cred, LEASE_WRITE);
|
|
VOP_SETATTR(vp, &vattr, cred, td);
|
|
VOP_UNLOCK(vp, 0, td);
|
|
PROC_LOCK(p);
|
|
p->p_acflag |= ACORE;
|
|
PROC_UNLOCK(p);
|
|
|
|
error = p->p_sysent->sv_coredump ?
|
|
p->p_sysent->sv_coredump(td, vp, limit) :
|
|
ENOSYS;
|
|
|
|
lf.l_type = F_UNLCK;
|
|
VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_FLOCK);
|
|
vn_finished_write(mp);
|
|
out2:
|
|
error1 = vn_close(vp, FWRITE, cred, td);
|
|
if (error == 0)
|
|
error = error1;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Nonexistent system call-- signal process (may want to handle it).
|
|
* Flag error in case process won't see signal immediately (blocked or ignored).
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct nosys_args {
|
|
int dummy;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
nosys(td, args)
|
|
struct thread *td;
|
|
struct nosys_args *args;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
|
|
mtx_lock(&Giant);
|
|
PROC_LOCK(p);
|
|
psignal(p, SIGSYS);
|
|
PROC_UNLOCK(p);
|
|
mtx_unlock(&Giant);
|
|
return (ENOSYS);
|
|
}
|
|
|
|
/*
|
|
* Send a SIGIO or SIGURG signal to a process or process group using
|
|
* stored credentials rather than those of the current process.
|
|
*/
|
|
void
|
|
pgsigio(sigiop, sig, checkctty)
|
|
struct sigio **sigiop;
|
|
int sig, checkctty;
|
|
{
|
|
struct sigio *sigio;
|
|
|
|
SIGIO_LOCK();
|
|
sigio = *sigiop;
|
|
if (sigio == NULL) {
|
|
SIGIO_UNLOCK();
|
|
return;
|
|
}
|
|
if (sigio->sio_pgid > 0) {
|
|
PROC_LOCK(sigio->sio_proc);
|
|
if (CANSIGIO(sigio->sio_ucred, sigio->sio_proc->p_ucred))
|
|
psignal(sigio->sio_proc, sig);
|
|
PROC_UNLOCK(sigio->sio_proc);
|
|
} else if (sigio->sio_pgid < 0) {
|
|
struct proc *p;
|
|
|
|
PGRP_LOCK(sigio->sio_pgrp);
|
|
LIST_FOREACH(p, &sigio->sio_pgrp->pg_members, p_pglist) {
|
|
PROC_LOCK(p);
|
|
if (CANSIGIO(sigio->sio_ucred, p->p_ucred) &&
|
|
(checkctty == 0 || (p->p_flag & P_CONTROLT)))
|
|
psignal(p, sig);
|
|
PROC_UNLOCK(p);
|
|
}
|
|
PGRP_UNLOCK(sigio->sio_pgrp);
|
|
}
|
|
SIGIO_UNLOCK();
|
|
}
|
|
|
|
static int
|
|
filt_sigattach(struct knote *kn)
|
|
{
|
|
struct proc *p = curproc;
|
|
|
|
kn->kn_ptr.p_proc = p;
|
|
kn->kn_flags |= EV_CLEAR; /* automatically set */
|
|
|
|
PROC_LOCK(p);
|
|
SLIST_INSERT_HEAD(&p->p_klist, kn, kn_selnext);
|
|
PROC_UNLOCK(p);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
filt_sigdetach(struct knote *kn)
|
|
{
|
|
struct proc *p = kn->kn_ptr.p_proc;
|
|
|
|
PROC_LOCK(p);
|
|
SLIST_REMOVE(&p->p_klist, kn, knote, kn_selnext);
|
|
PROC_UNLOCK(p);
|
|
}
|
|
|
|
/*
|
|
* signal knotes are shared with proc knotes, so we apply a mask to
|
|
* the hint in order to differentiate them from process hints. This
|
|
* could be avoided by using a signal-specific knote list, but probably
|
|
* isn't worth the trouble.
|
|
*/
|
|
static int
|
|
filt_signal(struct knote *kn, long hint)
|
|
{
|
|
|
|
if (hint & NOTE_SIGNAL) {
|
|
hint &= ~NOTE_SIGNAL;
|
|
|
|
if (kn->kn_id == hint)
|
|
kn->kn_data++;
|
|
}
|
|
return (kn->kn_data != 0);
|
|
}
|