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#!/bin/sh
#
# Test scenario by Tanaka Akira <akr@fsij.org>
# from Bug 131876 - [socket] FD leak by receiving SCM_RIGHTS by recvmsg with
# small control message buffer
# Fixed by 337423
. ../default.cfg
dir=/tmp
odir=`pwd`
cd $dir
sed '1,/^EOF/d' < $odir/$0 > $dir/sendmsg2.c
mycc -o sendmsg2 -Wall -Wextra -O0 -g sendmsg2.c || exit 1
rm -f sendmsg2.c
cd $odir
start=`date +%s`
/tmp/sendmsg2 &
while [ $((`date +%s` - start)) -lt 300 ]; do
kill -0 $! > /dev/null 2>&1 || break
sleep 2
done
if kill -0 $! > /dev/null 2>&1; then
echo FAIL
ps -lp $!
procstat -k $!
kill -9 $!
fi
while pkill sendmsg2; do :; done
wait
s=$?
rm -f /tmp/sendmsg2
exit $s
EOF
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#define MAX_FDS 10
#define SEND_FDS 10
#define RECV_FDS 3
void
test(void)
{
struct msghdr msg;
struct iovec iov;
union {
struct cmsghdr header;
char bytes[CMSG_SPACE(sizeof(int)*MAX_FDS)];
} cmsg;
struct cmsghdr *cmh = &cmsg.header, *c;
int *fds;
int i;
int ret;
int sv[2];
char buf[1024];
char cmdline[1024];
snprintf(cmdline, sizeof(cmdline), "fstat -p %u", (unsigned)getpid());
ret = socketpair(PF_UNIX, SOCK_STREAM, 0, sv);
if (ret == -1) { perror("socketpair"); exit(1); }
iov.iov_base = "a";
iov.iov_len = 1;
cmh->cmsg_len = CMSG_LEN(sizeof(int)*SEND_FDS);
cmh->cmsg_level = SOL_SOCKET;
cmh->cmsg_type = SCM_RIGHTS;
fds = (int *)CMSG_DATA(cmh);
for (i = 0; i < SEND_FDS; i++) {
fds[i] = 0; /* stdin */
}
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = cmh;
msg.msg_controllen = CMSG_SPACE(sizeof(int)*SEND_FDS);
msg.msg_flags = 0;
ret = sendmsg(sv[0], &msg, 0);
if (ret == -1) { perror("sendmsg"); exit(1); }
iov.iov_base = buf;
iov.iov_len = sizeof(buf);
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = cmh;
msg.msg_controllen = CMSG_SPACE(sizeof(int)*RECV_FDS);
msg.msg_flags = 0;
#if defined(DEBUG)
printf("before recvmsg: msg_controllen=%d\n", msg.msg_controllen);
#endif
ret = recvmsg(sv[1], &msg, 0);
if (ret == -1) { perror("sendmsg"); exit(1); }
#if defined(DEBUG)
printf("after recvmsg: msg_controllen=%d\n", msg.msg_controllen);
#endif
for (c = CMSG_FIRSTHDR(&msg); c != NULL; c = CMSG_NXTHDR(&msg, c)) {
if (c->cmsg_len == 0) { printf("cmsg_len is zero\n"); exit(1); }
if (c->cmsg_level == SOL_SOCKET && c->cmsg_type == SCM_RIGHTS) {
int *fdp, *end;
printf("cmsg_len=%d\n", c->cmsg_len);
fdp = (int *)CMSG_DATA(c);
end = (int *)((char *)c + c->cmsg_len);
for (i = 0; fdp+i < end; i++) {
printf("fd[%d]=%d\n", i, fdp[i]);
}
}
}
/* Note the missing sockets close */
}
int
main(void)
{
time_t start;
alarm(600);
start = time(NULL);
while (time(NULL) - start < 300)
test();
return (0);
}
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