When spawning a child command with pasta command... pasta should not leak fds that it opened. Only the fds that were already open should be given to the child. Run `pasta --config-net -- ls -l /proc/self/fd` from a terminal where only stdin/out/err are open. The fd 3 was opend by ls to read the /proc/self/fd dir. But fd 5 is the netlink socket that was opend in pasta. To prevent such a leak we will open the socket with SOCK_CLOEXEC. Signed-off-by: Paul Holzinger --- netlink.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/netlink.c b/netlink.c index 0850cbe..b8fa2a0 100644 --- a/netlink.c +++ b/netlink.c @@ -56,8 +56,8 @@ static int nl_sock_init_do(void *arg) if (arg) ns_enter((struct ctx *)arg); - if (((*s) = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) < 0 || - bind(*s, (struct sockaddr *)&addr, sizeof(addr))) { + *s = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE); + if (*s < 0 || bind(*s, (struct sockaddr *)&addr, sizeof(addr))) { *s = -1; return 0; } -- 2.39.1