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Message-Id: <20210706111409.2058071-68-sashal@kernel.org>
Date: Tue, 6 Jul 2021 07:12:08 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Kees Cook <keescook@...omium.org>,
Alex Deucher <alexander.deucher@....com>,
Sasha Levin <sashal@...nel.org>, amd-gfx@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.13 068/189] drm/amd/display: Avoid HDCP over-read and corruption
From: Kees Cook <keescook@...omium.org>
[ Upstream commit 06888d571b513cbfc0b41949948def6cb81021b2 ]
Instead of reading the desired 5 bytes of the actual target field,
the code was reading 8. This could result in a corrupted value if the
trailing 3 bytes were non-zero, so instead use an appropriately sized
and zero-initialized bounce buffer, and read only 5 bytes before casting
to u64.
Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c b/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c
index 2cbd931363bd..6d26d9c63ab2 100644
--- a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c
+++ b/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c
@@ -29,8 +29,10 @@ static inline enum mod_hdcp_status validate_bksv(struct mod_hdcp *hdcp)
{
uint64_t n = 0;
uint8_t count = 0;
+ u8 bksv[sizeof(n)] = { };
- memcpy(&n, hdcp->auth.msg.hdcp1.bksv, sizeof(uint64_t));
+ memcpy(bksv, hdcp->auth.msg.hdcp1.bksv, sizeof(hdcp->auth.msg.hdcp1.bksv));
+ n = *(uint64_t *)bksv;
while (n) {
count++;
--
2.30.2
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