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Code Issues Releases Wiki Activity

bpf, sockmap: fix map elem deletion race with smap_stop_sock

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The smap_start_sock() and smap_stop_sock() are each protected under
the sock->sk_callback_lock from their call-sites except in the case
of sock_map_delete_elem() where we drop the old socket from the map
slot. This is racy because the same sock could be part of multiple
sock maps, so we run smap_stop_sock() in parallel, and given at that
point psock->strp_enabled might be true on both CPUs, we might for
example wrongly restore the sk->sk_data_ready / sk->sk_write_space.
Therefore, hold the sock->sk_callback_lock as well on delete. Looks
like 2f857d0460 ("bpf: sockmap, remove STRPARSER map_flags and add
multi-map support") had this right, but later on e9db4ef6bf ("bpf:
sockhash fix omitted bucket lock in sock_close") removed it again
from delete leaving this smap_stop_sock() instance unprotected.

Fixes: e9db4ef6bf ("bpf: sockhash fix omitted bucket lock in sock_close")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Daniel Borkmann 2018-08-16 21:49:09 +02:00 committed by Alexei Starovoitov
parent d40b0116c9
commit 166ab6f0a0
1 changed files with 4 additions and 1 deletions
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5
kernel/bpf/sockmap.c
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@ -1786,8 +1786,11 @@ static int sock_map_delete_elem(struct bpf_map *map, void *key)
if (!psock)
goto out;
if (psock->bpf_parse)
if (psock->bpf_parse) {
write_lock_bh(&sock->sk_callback_lock);
smap_stop_sock(psock, sock);
write_unlock_bh(&sock->sk_callback_lock);
}
smap_list_map_remove(psock, &stab->sock_map[k]);
smap_release_sock(psock, sock);
out: