diff options
| author | Sabrina Dubroca <sd@queasysnail.net> | 2024-02-28 23:43:58 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-03-06 14:45:09 +0000 |
| commit | 08562ca971ff6d4d30ef7eb3fe932f8bf9dcd841 (patch) | |
| tree | b8c1b5267b0dd770fdf4b48ef7caf09398ddffc1 | |
| parent | 40f0f326cfe6847faaa409f4883b94fcdda468ab (diff) | |
| download | linux-08562ca971ff6d4d30ef7eb3fe932f8bf9dcd841.tar.gz | |
tls: fix peeking with sync+async decryption
[ Upstream commit 6caaf104423d809b49a67ee6500191d063b40dc6 ]
If we peek from 2 records with a currently empty rx_list, and the
first record is decrypted synchronously but the second record is
decrypted async, the following happens:
1. decrypt record 1 (sync)
2. copy from record 1 to the userspace's msg
3. queue the decrypted record to rx_list for future read(!PEEK)
4. decrypt record 2 (async)
5. queue record 2 to rx_list
6. call process_rx_list to copy data from the 2nd record
We currently pass copied=0 as skip offset to process_rx_list, so we
end up copying once again from the first record. We should skip over
the data we've already copied.
Seen with selftest tls.12_aes_gcm.recv_peek_large_buf_mult_recs
Fixes: 692d7b5d1f91 ("tls: Fix recvmsg() to be able to peek across multiple records")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Link: https://lore.kernel.org/r/1b132d2b2b99296bfde54e8a67672d90d6d16e71.1709132643.git.sd@queasysnail.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | net/tls/tls_sw.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c index c6ad435a44218a..2bd27b77769cba 100644 --- a/net/tls/tls_sw.c +++ b/net/tls/tls_sw.c @@ -2023,6 +2023,7 @@ int tls_sw_recvmsg(struct sock *sk, struct strp_msg *rxm; struct tls_msg *tlm; ssize_t copied = 0; + ssize_t peeked = 0; bool async = false; int target, err; bool is_kvec = iov_iter_is_kvec(&msg->msg_iter); @@ -2170,8 +2171,10 @@ put_on_rx_list: if (err < 0) goto put_on_rx_list_err; - if (is_peek) + if (is_peek) { + peeked += chunk; goto put_on_rx_list; + } if (partially_consumed) { rxm->offset += chunk; @@ -2210,8 +2213,8 @@ recv_end: /* Drain records from the rx_list & copy if required */ if (is_peek || is_kvec) - err = process_rx_list(ctx, msg, &control, copied, - decrypted, is_peek, NULL); + err = process_rx_list(ctx, msg, &control, copied + peeked, + decrypted - peeked, is_peek, NULL); else err = process_rx_list(ctx, msg, &control, 0, async_copy_bytes, is_peek, NULL); |