tree 2d0752c649ed26917f30e9233667fabc9d14cd56
parent 98adf6bc5807f39f84a9cef81d76d92bd8230595
author Jiayuan Chen <jiayuan.chen@linux.dev> 1749434932 +0800
committer Robert Kolchmeyer <rkolchmeyer@google.com> 1757557197 -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/440034366
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: I0beb2f20be3005fe90827c970c765208194c57a9
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/+/111095
Reviewed-by: Chenglong Tang <chenglongtang@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>