From 9ae0793f8fe491d7afcf3993d69281f04dc4c1f2 Mon Sep 17 00:00:00 2001 From: John Fastabend Date: Sat, 11 Jan 2020 06:12:03 +0000 Subject: [PATCH] bpf: Sockmap/tls, msg_push_data may leave end mark in place commit cf21e9ba1eb86c9333ca5b05b2f1cc94021bcaef upstream. Leaving an incorrect end mark in place when passing to crypto layer will cause crypto layer to stop processing data before all data is encrypted. To fix clear the end mark on push data instead of expecting users of the helper to clear the mark value after the fact. This happens when we push data into the middle of a skmsg and have room for it so we don't do a set of copies that already clear the end flag. Fixes: 6fff607e2f14b ("bpf: sk_msg program helper bpf_msg_push_data") Signed-off-by: John Fastabend Signed-off-by: Daniel Borkmann Acked-by: Song Liu Cc: stable@vger.kernel.org Link: https://lore.kernel.org/bpf/20200111061206.8028-6-john.fastabend@gmail.com Signed-off-by: Greg Kroah-Hartman --- net/core/filter.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/core/filter.c b/net/core/filter.c index 9eeef8a8ab6d..a0b68cbda7bc 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -2415,6 +2415,7 @@ BPF_CALL_4(bpf_msg_push_data, struct sk_msg *, msg, u32, start, sk_msg_iter_var_next(i); sg_unmark_end(psge); + sg_unmark_end(&rsge); sk_msg_iter_next(msg, end); }