tree d87652b365367786801c3d455443d3612085908b
parent 57b3cab9500aba5809ba1e87b7614ee13344f188
author Jiayuan Chen <jiayuan.chen@linux.dev> 1749434932 +0800
committer Robert Kolchmeyer <rkolchmeyer@google.com> 1757557172 -0700

bpf, ktls: Fix data corruption when using bpf_msg_pop_data() in ktls

[ Upstream commit 178f6a5c8cb3b6be1602de0964cd440243f493c9 ]

When sending plaintext data, we initially calculated the corresponding
ciphertext length. However, if we later reduced the plaintext data length
via socket policy, we failed to recalculate the ciphertext length.

This results in transmitting buffers containing uninitialized data during
ciphertext transmission.

This causes uninitialized bytes to be appended after a complete
"Application Data" packet, leading to errors on the receiving end when
parsing TLS record.

BUG=b/440033941
TEST=presubmit
RELEASE_NOTE=Fixed CVE-2025-38608 in the Linux kernel.

cos-patch: security-moderate
Fixes: d3b18ad31f93 ("tls: add bpf support to sk_msg handling")
Reported-by: Cong Wang <xiyou.wangcong@gmail.com>
Change-Id: I647afac2518a5cf07f1baf5321ce2807d76a87b4
Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/bpf/20250609020910.397930-2-jiayuan.chen@linux.dev
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Robert Kolchmeyer <rkolchmeyer@google.com>
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/111094
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Chenglong Tang <chenglongtang@google.com>