1e0d206337
- Make the socket path random and move it out of /tmp as that's outside ATF's prescribed path MFC after: 1 week Sponsored by: EMC / Isilon Storage Division
144 lines
4.4 KiB
C
144 lines
4.4 KiB
C
/*-
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* Copyright (c) 2010 Mikolaj Golub
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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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/*
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* This regression test attempts to trigger a race that occurs when both
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* endpoints of a connected UNIX domain socket are closed at once. The two
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* close paths may run concurrently leading to a call to sodisconnect() on an
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* already-closed socket in kernel. Before it was fixed, this might lead to
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* ENOTCONN being returned improperly from close().
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*
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* This race is fairly timing-dependent, so it effectively requires SMP, and
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* may not even trigger then.
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*/
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#include <sys/types.h>
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#include <sys/select.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/un.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <strings.h>
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#include <string.h>
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#include <unistd.h>
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#include <err.h>
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static char socket_path[] = "tmp.XXXXXXXX";
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#define USLEEP 100
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#define LOOPS 100000
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int
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main(void)
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{
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struct sockaddr_un servaddr;
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int listenfd, connfd, pid;
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u_int counter, ncpus;
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size_t len;
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len = sizeof(ncpus);
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if (sysctlbyname("kern.smp.cpus", &ncpus, &len, NULL, 0) < 0)
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err(1, "kern.smp.cpus");
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if (len != sizeof(ncpus))
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errx(1, "kern.smp.cpus: invalid length");
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if (ncpus < 2)
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warnx("SMP not present, test may be unable to trigger race");
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if (mkstemp(socket_path) == -1)
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err(1, "mkstemp failed");
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unlink(socket_path);
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/*
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* Create a UNIX domain socket that the child will repeatedly
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* accept() from, and that the parent will repeatedly connect() to.
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*/
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if ((listenfd = socket(AF_LOCAL, SOCK_STREAM, 0)) < 0)
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err(1, "parent: socket error");
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(void)unlink(socket_path);
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bzero(&servaddr, sizeof(servaddr));
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servaddr.sun_family = AF_LOCAL;
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strcpy(servaddr.sun_path, socket_path);
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if (bind(listenfd, (struct sockaddr *) &servaddr,
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sizeof(servaddr)) < 0)
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err(1, "parent: bind error");
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if (listen(listenfd, 1024) < 0)
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err(1, "parent: listen error");
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pid = fork();
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if (pid == -1)
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err(1, "fork()");
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if (pid != 0) {
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/*
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* In the parent, repeatedly connect and disconnect from the
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* socket, attempting to induce the race.
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*/
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close(listenfd);
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sleep(1);
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bzero(&servaddr, sizeof(servaddr));
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servaddr.sun_family = AF_LOCAL;
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strcpy(servaddr.sun_path, socket_path);
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for (counter = 0; counter < LOOPS; counter++) {
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if ((connfd = socket(AF_LOCAL, SOCK_STREAM, 0)) < 0) {
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(void)kill(pid, SIGTERM);
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err(1, "parent: socket error");
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}
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if (connect(connfd, (struct sockaddr *)&servaddr,
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sizeof(servaddr)) < 0) {
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(void)kill(pid, SIGTERM);
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err(1, "parent: connect error");
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}
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if (close(connfd) < 0) {
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(void)kill(pid, SIGTERM);
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err(1, "parent: close error");
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}
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usleep(USLEEP);
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}
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(void)kill(pid, SIGTERM);
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} else {
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/*
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* In the child, loop accepting and closing. We may pick up
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* the race here so report errors from close().
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*/
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for ( ; ; ) {
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if ((connfd = accept(listenfd,
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(struct sockaddr *)NULL, NULL)) < 0)
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err(1, "child: accept error");
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if (close(connfd) < 0)
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err(1, "child: close error");
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}
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}
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printf("OK\n");
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exit(0);
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}
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