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start: log sending and receiving of tty fds

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This is a potentially security sensitive operation and I really want to keep an
eye on *when exactly* this is send. So add more logging on the TRACE() level.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2017-06-01 05:40:59 +02:00
parent ff3381e14a
commit f07fa8df6e
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GPG Key ID: 7B3C391EFEA93624
2 changed files with 26 additions and 9 deletions
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19
src/lxc/conf.c
View File

@ -4107,21 +4107,30 @@ static int send_fd(int sock, int fd)
static int send_ttys_to_parent(struct lxc_handler *handler)
{
int i, ret;
struct lxc_conf *conf = handler->conf;
const struct lxc_tty_info *tty_info = &conf->tty_info;
int i;
int sock = handler->ttysock[0];
for (i = 0; i < tty_info->nbtty; i++) {
struct lxc_pty_info *pty_info = &tty_info->pty_info[i];
if (send_fd(sock, pty_info->slave) < 0)
goto bad;
ret = send_fd(sock, pty_info->slave);
if (ret >= 0)
send_fd(sock, pty_info->master);
TRACE("sending pty \"%s\" with master fd %d and slave fd %d to "
"parent",
pty_info->name, pty_info->master, pty_info->slave);
close(pty_info->slave);
pty_info->slave = -1;
if (send_fd(sock, pty_info->master) < 0)
goto bad;
close(pty_info->master);
pty_info->master = -1;
if (ret < 0) {
ERROR("failed to send pty \"%s\" with master fd %d and "
"slave fd %d to parent : %s",
pty_info->name, pty_info->master, pty_info->slave,
strerror(errno));
goto bad;
}
}
close(handler->ttysock[0]);

16
src/lxc/start.c
View File

@ -1021,8 +1021,9 @@ static int recv_fd(int sock, int *fd)
static int recv_ttys_from_child(struct lxc_handler *handler)
{
int i, ret;
int sock = handler->ttysock[1];
struct lxc_conf *conf = handler->conf;
int i, sock = handler->ttysock[1];
struct lxc_tty_info *tty_info = &conf->tty_info;
if (!conf->tty)
@ -1035,11 +1036,18 @@ static int recv_ttys_from_child(struct lxc_handler *handler)
for (i = 0; i < conf->tty; i++) {
struct lxc_pty_info *pty_info = &tty_info->pty_info[i];
pty_info->busy = 0;
if (recv_fd(sock, &pty_info->slave) < 0 ||
recv_fd(sock, &pty_info->master) < 0) {
ERROR("Error receiving tty info from child process.");
ret = recv_fd(sock, &pty_info->slave);
if (ret >= 0)
recv_fd(sock, &pty_info->master);
if (ret < 0) {
ERROR("failed to receive pty with master fd %d and "
"slave fd %d from child: %s",
pty_info->master, pty_info->slave,
strerror(errno));
return -1;
}
TRACE("received pty with master fd %d and slave fd %d from child",
pty_info->master, pty_info->slave);
}
tty_info->nbtty = conf->tty;