[PATCH] libbpf: use SOCK_CLOEXEC when opening the netlink socket

[Kumar Kartikeya Dwivedi]

Otherwise, there exists a small window between the opening and closing
of the socket fd where it may leak into processes launched by some other
thread.

Signed-off-by: Kumar Kartikeya Dwivedi <mem...@gmail.com>
---
 tools/lib/bpf/netlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/lib/bpf/netlink.c b/tools/lib/bpf/netlink.c
index 4dd73de00..d2cb28e9e 100644
--- a/tools/lib/bpf/netlink.c
+++ b/tools/lib/bpf/netlink.c
@@ -40,7 +40,7 @@ static int libbpf_netlink_open(__u32 *nl_pid)
        memset(&sa, 0, sizeof(sa));
        sa.nl_family = AF_NETLINK;
 
-       sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+       sock = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE);
        if (sock < 0)
                return -errno;
 
-- 
2.30.2