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linux/drivers/tee
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Jann Horn 7109ae53f9 tee: Prevent size calculation wraparound on 32-bit kernels 
[ Upstream commit 39bb67edcc ]

The current code around TEE_IOCTL_PARAM_SIZE() is a bit wrong on
32-bit kernels: Multiplying a user-provided 32-bit value with the
size of a structure can wrap around on such platforms.

Fix it by using saturating arithmetic for the size calculation.

This has no security consequences because, in all users of
TEE_IOCTL_PARAM_SIZE(), the subsequent kcalloc() implicitly checks
for wrapping.

Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Tested-by: Rouven Czerwinski <rouven.czerwinski@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-06-27 11:11:36 +01:00
..
amdtee tee: Refactor TEE subsystem header files 2024-04-03 09:19:31 +02:00
optee tee: optee: Fix supplicant wait loop 2025-02-27 04:30:21 -08:00
tstee tee: tstee: Add Trusted Services TEE driver 2024-04-03 14:03:09 +02:00
Kconfig tee: tstee: Add Trusted Services TEE driver 2024-04-03 14:03:09 +02:00
Makefile tee: tstee: Add Trusted Services TEE driver 2024-04-03 14:03:09 +02:00
tee_core.c tee: Prevent size calculation wraparound on 32-bit kernels 2025-06-27 11:11:36 +01:00
tee_private.h tee: Refactor TEE subsystem header files 2024-04-03 09:19:31 +02:00
tee_shm.c tee: optee: Move pool_op helper functions 2024-04-03 13:58:20 +02:00
tee_shm_pool.c tee: Refactor TEE subsystem header files 2024-04-03 09:19:31 +02:00