From: Sabrina Dubroca Date: Tue, 14 Oct 2025 09:16:56 +0000 (+0200) Subject: tls: trim encrypted message to match the plaintext on short splice X-Git-Tag: v6.12.55~78 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b1cf131f6df85dfb8c11272b6198389cdeaf63f0;p=thirdparty%2Fkernel%2Fstable.git tls: trim encrypted message to match the plaintext on short splice [ Upstream commit ce5af41e3234425a40974696682163edfd21128c ] During tls_sw_sendmsg_locked, we pre-allocate the encrypted message for the size we're expecting to send during the current iteration, but we may end up sending less, for example when splicing: if we're getting the data from small fragments of memory, we may fill up all the slots in the skmsg with less data than expected. In this case, we need to trim the encrypted message to only the length we actually need, to avoid pushing uninitialized bytes down the underlying TCP socket. Fixes: fe1e81d4f73b ("tls/sw: Support MSG_SPLICE_PAGES") Reported-by: Jann Horn Signed-off-by: Sabrina Dubroca Link: https://patch.msgid.link/66a0ae99c9efc15f88e9e56c1f58f902f442ce86.1760432043.git.sd@queasysnail.net Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c index f46550b96061e..aac685daf66c4 100644 --- a/net/tls/tls_sw.c +++ b/net/tls/tls_sw.c @@ -1112,8 +1112,11 @@ alloc_encrypted: goto send_end; tls_ctx->pending_open_record_frags = true; - if (sk_msg_full(msg_pl)) + if (sk_msg_full(msg_pl)) { full_record = true; + sk_msg_trim(sk, msg_en, + msg_pl->sg.size + prot->overhead_size); + } if (full_record || eor) goto copied;