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authorJakub Kicinski <jakub.kicinski@netronome.com>2019-05-24 19:34:32 +0200
committerDavid S. Miller <davem@davemloft.net>2019-05-27 06:47:13 +0200
commit04b25a5411f966c2e586909a8496553b71876fae (patch)
tree18417d59629d044b2b0ce5f0a057e3c62643f1d6 /net/tls
parentselftests/tls: test for lowat overshoot with multiple records (diff)
downloadlinux-04b25a5411f966c2e586909a8496553b71876fae.tar.xz
linux-04b25a5411f966c2e586909a8496553b71876fae.zip
net/tls: fix no wakeup on partial reads
When tls_sw_recvmsg() partially copies a record it pops that record from ctx->recv_pkt and places it on rx_list. Next iteration of tls_sw_recvmsg() reads from rx_list via process_rx_list() before it enters the decryption loop. If there is no more records to be read tls_wait_data() will put the process on the wait queue and got to sleep. This is incorrect, because some data was already copied in process_rx_list(). In case of RPC connections process may never get woken up, because peer also simply blocks in read(). I think this may also fix a similar issue when BPF is at play, because after __tcp_bpf_recvmsg() returns some data we subtract it from len and use continue to restart the loop, but len could have just reached 0, so again we'd sleep unnecessarily. That's added by: commit d3b18ad31f93 ("tls: add bpf support to sk_msg handling") Fixes: 692d7b5d1f91 ("tls: Fix recvmsg() to be able to peek across multiple records") Reported-by: David Beckett <david.beckett@netronome.com> Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com> Tested-by: David Beckett <david.beckett@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tls')
-rw-r--r--net/tls/tls_sw.c8
1 files changed, 2 insertions, 6 deletions
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index fc13234db74a..960494f437ac 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -1719,7 +1719,7 @@ int tls_sw_recvmsg(struct sock *sk,
len = len - copied;
timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
- do {
+ while (len && (decrypted + copied < target || ctx->recv_pkt)) {
bool retain_skb = false;
bool zc = false;
int to_decrypt;
@@ -1850,11 +1850,7 @@ pick_next_record:
} else {
break;
}
-
- /* If we have a new message from strparser, continue now. */
- if (decrypted + copied >= target && !ctx->recv_pkt)
- break;
- } while (len);
+ }
recv_end:
if (num_async) {