Commit 53911428 authored by Jakub Kicinski's avatar Jakub Kicinski Committed by Greg Kroah-Hartman

net/tls: fix poll ignoring partially copied records

[ Upstream commit 13aecb17 ]

David reports that RPC applications which use epoll() occasionally
get stuck, and that TLS ULP causes the kernel to not wake applications,
even though read() will return data.

This is indeed true. The ctx->rx_list which holds partially copied
records is not consulted when deciding whether socket is readable.

Note that SO_RCVLOWAT with epoll() is and has always been broken for
kernel TLS. We'd need to parse all records from the TCP layer, instead
of just the first one.

Fixes: 692d7b5d ("tls: Fix recvmsg() to be able to peek across multiple records")
Reported-by: default avatarDavid Beckett <david.beckett@netronome.com>
Signed-off-by: default avatarJakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: default avatarDirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d7728216
......@@ -1931,7 +1931,8 @@ bool tls_sw_stream_read(const struct sock *sk)
ingress_empty = list_empty(&psock->ingress_msg);
rcu_read_unlock();
return !ingress_empty || ctx->recv_pkt;
return !ingress_empty || ctx->recv_pkt ||
!skb_queue_empty(&ctx->rx_list);
}
static int tls_read_size(struct strparser *strp, struct sk_buff *skb)
......
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