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Don't leak file descriptors 

We're leaking file descriptors to child processes. Set FD_CLOEXEC on file
descriptors that don't need to be passed to children to stop this misbehaviour.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Kevin Wolf 2009-12-02 12:24:42 +01:00 committed by Anthony Liguori
parent 12c09b8ce2
commit 40ff6d7e8d
20 changed files with 178 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
block/raw-posix.c
View File

@ -153,7 +153,7 @@ static int raw_open_common(BlockDriverState *bs, const char *filename,
s->open_flags |= O_DSYNC;
s->fd = -1;
fd = open(filename, s->open_flags, 0644);
fd = qemu_open(filename, s->open_flags, 0644);
if (fd < 0) {
ret = -errno;
if (ret == -EROFS)

20
configure vendored
View File

@ -1570,6 +1570,23 @@ if compile_prog "" "" ; then
pipe2=yes
fi
# check if accept4 is there
accept4=no
cat > $TMPC << EOF
#define _GNU_SOURCE
#include <sys/socket.h>
#include <stddef.h>
int main(void)
{
accept4(0, NULL, NULL, SOCK_CLOEXEC);
return 0;
}
EOF
if compile_prog "" "" ; then
accept4=yes
fi
# check if tee/splice is there. vmsplice was added same time.
splice=no
cat > $TMPC << EOF
@ -2014,6 +2031,9 @@ fi
if test "$pipe2" = "yes" ; then
echo "CONFIG_PIPE2=y" >> $config_host_mak
fi
if test "$accept4" = "yes" ; then
echo "CONFIG_ACCEPT4=y" >> $config_host_mak
fi
if test "$splice" = "yes" ; then
echo "CONFIG_SPLICE=y" >> $config_host_mak
fi

6
gdbstub.c
View File

@ -2356,6 +2356,9 @@ static void gdb_accept(void)
perror("accept");
return;
} else if (fd >= 0) {
#ifndef _WIN32
fcntl(fd, F_SETFD, FD_CLOEXEC);
#endif
break;
}
}
@ -2385,6 +2388,9 @@ static int gdbserver_open(int port)
perror("socket");
return -1;
}
#ifndef _WIN32
fcntl(fd, F_SETFD, FD_CLOEXEC);
#endif
/* allow fast reuse */
val = 1;

2
kvm-all.c
View File

@ -416,7 +416,7 @@ int kvm_init(int smp_cpus)
s->slots[i].slot = i;
s->vmfd = -1;
s->fd = open("/dev/kvm", O_RDWR);
s->fd = qemu_open("/dev/kvm", O_RDWR);
if (s->fd == -1) {
fprintf(stderr, "Could not access KVM kernel module: %m\n");
ret = -errno;

6
migration-tcp.c
View File

@ -105,7 +105,7 @@ MigrationState *tcp_start_outgoing_migration(Monitor *mon,
s->state = MIG_STATE_ACTIVE;
s->mon = NULL;
s->bandwidth_limit = bandwidth_limit;
s->fd = socket(PF_INET, SOCK_STREAM, 0);
s->fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
if (s->fd == -1) {
qemu_free(s);
return NULL;
@ -146,7 +146,7 @@ static void tcp_accept_incoming_migration(void *opaque)
int c, ret;
do {
c = accept(s, (struct sockaddr *)&addr, &addrlen);
c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
} while (c == -1 && socket_error() == EINTR);
dprintf("accepted migration\n");
@ -193,7 +193,7 @@ int tcp_start_incoming_migration(const char *host_port)
return -EINVAL;
}
s = socket(PF_INET, SOCK_STREAM, 0);
s = qemu_socket(PF_INET, SOCK_STREAM, 0);
if (s == -1)
return -socket_error();

6
migration-unix.c
View File

@ -104,7 +104,7 @@ MigrationState *unix_start_outgoing_migration(Monitor *mon,
s->state = MIG_STATE_ACTIVE;
s->mon = NULL;
s->bandwidth_limit = bandwidth_limit;
s->fd = socket(PF_UNIX, SOCK_STREAM, 0);
s->fd = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
if (s->fd < 0) {
dprintf("Unable to open socket");
goto err_after_alloc;
@ -150,7 +150,7 @@ static void unix_accept_incoming_migration(void *opaque)
int c, ret;
do {
c = accept(s, (struct sockaddr *)&addr, &addrlen);
c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
} while (c == -1 && socket_error() == EINTR);
dprintf("accepted migration\n");
@ -191,7 +191,7 @@ int unix_start_incoming_migration(const char *path)
dprintf("Attempting to start an incoming migration\n");
sock = socket(PF_UNIX, SOCK_STREAM, 0);
sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
if (sock < 0) {
fprintf(stderr, "Could not open unix socket: %s\n", strerror(errno));
return -EINVAL;

8
net/socket.c
View File

@ -161,7 +161,7 @@ static int net_socket_mcast_create(struct sockaddr_in *mcastaddr)
return -1;
}
fd = socket(PF_INET, SOCK_DGRAM, 0);
fd = qemu_socket(PF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
perror("socket(PF_INET, SOCK_DGRAM)");
return -1;
@ -355,7 +355,7 @@ static void net_socket_accept(void *opaque)
for(;;) {
len = sizeof(saddr);
fd = accept(s->fd, (struct sockaddr *)&saddr, &len);
fd = qemu_accept(s->fd, (struct sockaddr *)&saddr, &len);
if (fd < 0 && errno != EINTR) {
return;
} else if (fd >= 0) {
@ -386,7 +386,7 @@ static int net_socket_listen_init(VLANState *vlan,
s = qemu_mallocz(sizeof(NetSocketListenState));
fd = socket(PF_INET, SOCK_STREAM, 0);
fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
if (fd < 0) {
perror("socket");
return -1;
@ -427,7 +427,7 @@ static int net_socket_connect_init(VLANState *vlan,
if (parse_host_port(&saddr, host_str) < 0)
return -1;
fd = socket(PF_INET, SOCK_STREAM, 0);
fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
if (fd < 0) {
perror("socket");
return -1;

104
osdep.c
View File

@ -121,7 +121,7 @@ int qemu_create_pidfile(const char *filename)
#ifndef _WIN32
int fd;
fd = open(filename, O_RDWR | O_CREAT, 0600);
fd = qemu_open(filename, O_RDWR | O_CREAT, 0600);
if (fd == -1)
return -1;
@ -201,11 +201,113 @@ int inet_aton(const char *cp, struct in_addr *ia)
ia->s_addr = addr;
return 1;
}
void qemu_set_cloexec(int fd)
{
}
#else
void socket_set_nonblock(int fd)
{
int f;
f = fcntl(fd, F_GETFL);
fcntl(fd, F_SETFL, f | O_NONBLOCK);
}
void qemu_set_cloexec(int fd)
{
int f;
f = fcntl(fd, F_GETFD);
fcntl(fd, F_SETFD, f | FD_CLOEXEC);
}
#endif
/*
* Opens a file with FD_CLOEXEC set
*/
int qemu_open(const char *name, int flags, ...)
{
int ret;
int mode = 0;
if (flags & O_CREAT) {
va_list ap;
va_start(ap, flags);
mode = va_arg(ap, int);
va_end(ap);
}
#ifdef O_CLOEXEC
ret = open(name, flags | O_CLOEXEC, mode);
#else
ret = open(name, flags, mode);
if (ret >= 0) {
qemu_set_cloexec(ret);
}
#endif
return ret;
}
#ifndef _WIN32
/*
* Creates a pipe with FD_CLOEXEC set on both file descriptors
*/
int qemu_pipe(int pipefd[2])
{
int ret;
#ifdef CONFIG_PIPE2
ret = pipe2(pipefd, O_CLOEXEC);
#else
ret = pipe(pipefd);
if (ret == 0) {
qemu_set_cloexec(pipefd[0]);
qemu_set_cloexec(pipefd[1]);
}
#endif
return ret;
}
#endif
/*
* Opens a socket with FD_CLOEXEC set
*/
int qemu_socket(int domain, int type, int protocol)
{
int ret;
#ifdef SOCK_CLOEXEC
ret = socket(domain, type | SOCK_CLOEXEC, protocol);
#else
ret = socket(domain, type, protocol);
if (ret >= 0) {
qemu_set_cloexec(ret);
}
#endif
return ret;
}
/*
* Accept a connection and set FD_CLOEXEC
*/
int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
{
int ret;
#ifdef CONFIG_ACCEPT4
ret = accept4(s, addr, addrlen, SOCK_CLOEXEC);
#else
ret = accept(s, addr, addrlen);
if (ret >= 0) {
qemu_set_cloexec(ret);
}
#endif
return ret;
}

2
posix-aio-compat.c
View File

@ -625,7 +625,7 @@ int paio_init(void)
sigaction(SIGUSR2, &act, NULL);
s->first_aio = NULL;
if (pipe(fds) == -1) {
if (qemu_pipe(fds) == -1) {
fprintf(stderr, "failed to create pipe\n");
return -1;
}

8
qemu-char.c
View File

@ -620,7 +620,7 @@ static CharDriverState *qemu_chr_open_file_out(QemuOpts *opts)
{
int fd_out;
TFR(fd_out = open(qemu_opt_get(opts, "path"),
TFR(fd_out = qemu_open(qemu_opt_get(opts, "path"),
O_WRONLY | O_TRUNC | O_CREAT | O_BINARY, 0666));
if (fd_out < 0)
return NULL;
@ -640,8 +640,8 @@ static CharDriverState *qemu_chr_open_pipe(QemuOpts *opts)
snprintf(filename_in, 256, "%s.in", filename);
snprintf(filename_out, 256, "%s.out", filename);
TFR(fd_in = open(filename_in, O_RDWR | O_BINARY));
TFR(fd_out = open(filename_out, O_RDWR | O_BINARY));
TFR(fd_in = qemu_open(filename_in, O_RDWR | O_BINARY));
TFR(fd_out = qemu_open(filename_out, O_RDWR | O_BINARY));
if (fd_in < 0 || fd_out < 0) {
if (fd_in >= 0)
close(fd_in);
@ -2101,7 +2101,7 @@ static void tcp_chr_accept(void *opaque)
len = sizeof(saddr);
addr = (struct sockaddr *)&saddr;
}
fd = accept(s->listen_fd, addr, &len);
fd = qemu_accept(s->listen_fd, addr, &len);
if (fd < 0 && errno != EINTR) {
return;
} else if (fd >= 0) {

7
qemu-common.h
View File

@ -159,6 +159,13 @@ void *get_mmap_addr(unsigned long size);
void qemu_mutex_lock_iothread(void);
void qemu_mutex_unlock_iothread(void);
int qemu_open(const char *name, int flags, ...);
void qemu_set_cloexec(int fd);
#ifndef _WIN32
int qemu_pipe(int pipefd[2]);
#endif
/* Error handling. */
void QEMU_NORETURN hw_error(const char *fmt, ...)

10
qemu-sockets.c
View File

@ -160,7 +160,7 @@ int inet_listen_opts(QemuOpts *opts, int port_offset)
getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
uaddr,INET6_ADDRSTRLEN,uport,32,
NI_NUMERICHOST | NI_NUMERICSERV);
slisten = socket(e->ai_family, e->ai_socktype, e->ai_protocol);
slisten = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol);
if (slisten < 0) {
fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
inet_strfamily(e->ai_family), strerror(errno));
@ -258,7 +258,7 @@ int inet_connect_opts(QemuOpts *opts)
fprintf(stderr,"%s: getnameinfo: oops\n", __FUNCTION__);
continue;
}
sock = socket(e->ai_family, e->ai_socktype, e->ai_protocol);
sock = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol);
if (sock < 0) {
fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
inet_strfamily(e->ai_family), strerror(errno));
@ -351,7 +351,7 @@ int inet_dgram_opts(QemuOpts *opts)
}
/* create socket */
sock = socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
if (sock < 0) {
fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
inet_strfamily(peer->ai_family), strerror(errno));
@ -505,7 +505,7 @@ int unix_listen_opts(QemuOpts *opts)
const char *path = qemu_opt_get(opts, "path");
int sock, fd;
sock = socket(PF_UNIX, SOCK_STREAM, 0);
sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
if (sock < 0) {
perror("socket(unix)");
return -1;
@ -560,7 +560,7 @@ int unix_connect_opts(QemuOpts *opts)
return -1;
}
sock = socket(PF_UNIX, SOCK_STREAM, 0);
sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
if (sock < 0) {
perror("socket(unix)");
return -1;

2
qemu_socket.h
View File

@ -32,6 +32,8 @@ int inet_aton(const char *cp, struct in_addr *ia);
#include "qemu-option.h"
/* misc helpers */
int qemu_socket(int domain, int type, int protocol);
int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen);
void socket_set_nonblock(int fd);
int send_all(int fd, const void *buf, int len1);

4
slirp/misc.c
View File

@ -132,7 +132,7 @@ fork_exec(struct socket *so, const char *ex, int do_pty)
addr.sin_port = 0;
addr.sin_addr.s_addr = INADDR_ANY;
if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0 ||
if ((s = qemu_socket(AF_INET, SOCK_STREAM, 0)) < 0 ||
bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
listen(s, 1) < 0) {
lprint("Error: inet socket: %s\n", strerror(errno));
@ -165,7 +165,7 @@ fork_exec(struct socket *so, const char *ex, int do_pty)
* Connect to the socket
* XXX If any of these fail, we're in trouble!
*/
s = socket(AF_INET, SOCK_STREAM, 0);
s = qemu_socket(AF_INET, SOCK_STREAM, 0);
addr.sin_addr = loopback_addr;
do {
ret = connect(s, (struct sockaddr *)&addr, addrlen);

4
slirp/slirp.h
View File

@ -197,6 +197,10 @@ int inet_aton(const char *cp, struct in_addr *ia);
#include "bootp.h"
#include "tftp.h"
/* osdep.c */
int qemu_socket(int domain, int type, int protocol);
struct Slirp {
QTAILQ_ENTRY(Slirp) entry;

2
slirp/socket.c
View File

@ -626,7 +626,7 @@ tcp_listen(Slirp *slirp, u_int32_t haddr, u_int hport, u_int32_t laddr,
addr.sin_addr.s_addr = haddr;
addr.sin_port = hport;
if (((s = socket(AF_INET,SOCK_STREAM,0)) < 0) ||
if (((s = qemu_socket(AF_INET,SOCK_STREAM,0)) < 0) ||
(setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)) < 0) ||
(bind(s,(struct sockaddr *)&addr, sizeof(addr)) < 0) ||
(listen(s,1) < 0)) {

2
slirp/tcp_subr.c
View File

@ -325,7 +325,7 @@ int tcp_fconnect(struct socket *so)
DEBUG_CALL("tcp_fconnect");
DEBUG_ARG("so = %lx", (long )so);
if( (ret=so->s=socket(AF_INET,SOCK_STREAM,0)) >= 0) {
if( (ret = so->s = qemu_socket(AF_INET,SOCK_STREAM,0)) >= 0) {
int opt, s=so->s;
struct sockaddr_in addr;

4
slirp/udp.c
View File

@ -302,7 +302,7 @@ int udp_output(struct socket *so, struct mbuf *m,
int
udp_attach(struct socket *so)
{
if((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1) {
if((so->s = qemu_socket(AF_INET,SOCK_DGRAM,0)) != -1) {
so->so_expire = curtime + SO_EXPIRE;
insque(so, &so->slirp->udb);
}
@ -350,7 +350,7 @@ udp_listen(Slirp *slirp, u_int32_t haddr, u_int hport, u_int32_t laddr,
if (!so) {
return NULL;
}
so->s = socket(AF_INET,SOCK_DGRAM,0);
so->s = qemu_socket(AF_INET,SOCK_DGRAM,0);
so->so_expire = curtime + SO_EXPIRE;
insque(so, &slirp->udb);

11
vl.c
View File

@ -1243,7 +1243,7 @@ static int hpet_start_timer(struct qemu_alarm_timer *t)
struct hpet_info info;
int r, fd;
fd = open("/dev/hpet", O_RDONLY);
fd = qemu_open("/dev/hpet", O_RDONLY);
if (fd < 0)
return -1;
@ -1292,7 +1292,7 @@ static int rtc_start_timer(struct qemu_alarm_timer *t)
int rtc_fd;
unsigned long current_rtc_freq = 0;
TFR(rtc_fd = open("/dev/rtc", O_RDONLY));
TFR(rtc_fd = qemu_open("/dev/rtc", O_RDONLY));
if (rtc_fd < 0)
return -1;
ioctl(rtc_fd, RTC_IRQP_READ, &current_rtc_freq);
@ -3337,7 +3337,7 @@ static int qemu_event_init(void)
int err;
int fds[2];
err = pipe(fds);
err = qemu_pipe(fds);
if (err == -1)
return -errno;
@ -5507,6 +5507,9 @@ int main(int argc, char **argv, char **envp)
} else if (pid < 0)
exit(1);
close(fds[0]);
qemu_set_cloexec(fds[1]);
setsid();
pid = fork();
@ -5907,7 +5910,7 @@ int main(int argc, char **argv, char **envp)
exit(1);
chdir("/");
TFR(fd = open("/dev/null", O_RDWR));
TFR(fd = qemu_open("/dev/null", O_RDWR));
if (fd == -1)
exit(1);
}

2
vnc.c
View File

@ -2247,7 +2247,7 @@ static void vnc_listen_read(void *opaque)
/* Catch-up */
vga_hw_update();
int csock = accept(vs->lsock, (struct sockaddr *)&addr, &addrlen);
int csock = qemu_accept(vs->lsock, (struct sockaddr *)&addr, &addrlen);
if (csock != -1) {
vnc_connect(vs, csock);
}