Iterate rather than use recursion. We can blow out the kernel stack if there
is a long chain of fork(2)s.
This commit is contained in:
parent
3952727d79
commit
93665dfffb
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=242137
@ -82,15 +82,14 @@ filemon_pid_check(struct proc *p)
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{
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struct filemon *filemon;
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TAILQ_FOREACH(filemon, &filemons_inuse, link) {
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if (p->p_pid == filemon->pid)
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return (filemon);
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while (p->p_pptr) {
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TAILQ_FOREACH(filemon, &filemons_inuse, link) {
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if (p->p_pid == filemon->pid)
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return (filemon);
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}
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p = p->p_pptr;
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}
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if (p->p_pptr == NULL)
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return (NULL);
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return (filemon_pid_check(p->p_pptr));
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return (NULL);
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}
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static void
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@ -1,15 +1,33 @@
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# $FreeBSD$
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PROG= filemontest
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BINS= \
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filemontest \
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timed-forkb
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bins: filemontest timed-forkb
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all: bins
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NO_MAN=
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WARNS?= 6
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CFLAGS+= -I${.CURDIR}/../../../sys
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# Should be "WITHOUT_CTF=" below, but stupid infastrurture fails:
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# "/usr/share/mk/bsd.own.mk", line 489: WITH_CTF and WITHOUT_CTF can't both be set.
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WITHOUT_CDDL=
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CLEANFILES+= ${BINS}
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tests: bins
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kldstat | grep filemon
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${MAKE} test
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./timed-forkb
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@echo "filemon(4) tests passed."
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# Cannot use .OBJDIR -- 'filemontest' expects 'test_script.sh' in .
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test: ${PROG} clean-test
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.for BIN in ${PROG} ${PROG}32
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#FILEMONTEST32= filemontest32
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test: filemontest clean-test
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.for BIN in filemontest ${FILEMONTEST32}
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cd ${.CURDIR} ; \
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for A in 1 2 3 4 5 6 7 8 9 0; do \
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for B in 1 2 3 4 5 6 7 8 9 0; do \
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177
tools/regression/filemon/timed-forkb.c
Normal file
177
tools/regression/filemon/timed-forkb.c
Normal file
@ -0,0 +1,177 @@
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/*-
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* Copyright (c) 2012 David O'Brien
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <sys/resource.h>
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#include <sys/sysctl.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <err.h>
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#include <assert.h>
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#ifndef SLEEP
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#define SLEEP 20 /* seconds */
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#endif
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int verbose;
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static void
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usage(void)
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{
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fprintf(stderr, "usage: %s\n", getprogname());
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fprintf(stderr, "\t\t-n : length of fork(2) chain\n");
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fprintf(stderr, "\t\t-t : limit run-time seconds\n");
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exit(1);
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/* NOTREACHED */
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}
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void term(int);
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void
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term(int signum)
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{
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if (getpid() == getpgrp() || verbose) {
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fprintf(stderr,
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"pid %d pgroup %d (ppid %d): Received SIGTERM(%d), exiting...\n",
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getpid(), getpgrp(), getppid(), signum);
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}
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exit(1);
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}
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void angel_of_mercy(int);
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void
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angel_of_mercy(int sig __unused)
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{
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signal(SIGALRM, SIG_IGN); /* ignore this signal */
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printf("Master process: alarmed waking up\n");
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killpg(0, SIGTERM);
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return;
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}
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int bombing_run(unsigned, int);
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int
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bombing_run(unsigned chainlen, int stime)
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{
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struct rusage ru;
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pid_t pid, cpid;
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int status;
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if (chainlen) {
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switch (pid = fork()) {
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case -1:
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errx(1, "%s: can't fork", __func__);
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case 0:
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/* This is the code the child runs. */
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bombing_run(--chainlen, stime);
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break;
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default:
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/* This is the code the parent runs. */
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if (getpid() == getpgrp()) {
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signal(SIGALRM, angel_of_mercy);
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alarm(stime); // time for bombing run...
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cpid = wait4(pid, &status, 0, &ru);
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alarm(0);
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printf(
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"Cleanly shutting down - pid %d pgroup %d (ppid %d)\n",
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getpid(), getpgrp(), getppid());
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} else {
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cpid = wait4(pid, &status, 0, &ru);
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}
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}
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}
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return 0;
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}
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int
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main(int argc, char *argv[])
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{
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time_t start /*,tvec*/;
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char *endptr, *ctm;
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size_t len;
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int nflag, tflag;
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int ch, k, maxprocperuid;
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(void)signal(SIGTERM, term);
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nflag = 0;
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tflag = SLEEP;
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start = time(NULL);
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ctm = ctime(&start);
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ctm[24] = '\0'; // see: man 3 ctime
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fprintf(stderr, "*** fork() generation started on \"%s\" ***\n", ctm);
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while ((ch = getopt(argc, argv, "n:t:v")) != -1)
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switch (ch) {
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case 'n':
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nflag = strtol(optarg, &endptr, 10);
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if (nflag <= 0 || *endptr != '\0')
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errx(1, "illegal number, -n argument -- %s",
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optarg);
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break;
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case 't':
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tflag = strtol(optarg, &endptr, 10);
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if (tflag <= 0 || *endptr != '\0')
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errx(1, "illegal number, -t argument -- %s",
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optarg);
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break;
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case 'v':
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++verbose;
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break;
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default:
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usage();
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}
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argv += optind;
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if (!nflag) {
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len = sizeof(maxprocperuid);
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k = sysctlbyname("kern.maxprocperuid", &maxprocperuid, &len,
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NULL, 0);
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assert(k != ENOMEM);
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/* Try to allow a shell to still be started. */
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nflag = maxprocperuid - 10;
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}
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// Ensure a unique process group to make killing all children easier.
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setpgrp(0,0);
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printf(" pid %d pgroup %d (ppid %d), %d fork chain over %d sec\n",
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getpid(), getpgrp(), getppid(), nflag - 1, tflag);
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return bombing_run(nflag, tflag);
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}
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