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libbpf: Use SOCK_CLOEXEC when opening the netlink socket

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[ Upstream commit 58bfd95b554f1a23d01228672f86bb489bdbf4ba ]

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.

Fixes: 949abbe884 ("libbpf: add function to setup XDP")
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/bpf/20210317115857.6536-1-memxor@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kumar Kartikeya Dwivedi 2021-03-17 17:28:58 +05:30 committed by Greg Kroah-Hartman
parent 86e525bc04
commit b4c574e4b4
1 changed files with 1 additions and 1 deletions
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2
tools/lib/bpf/netlink.c
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@ -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;