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linux/drivers/tee
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Sumit Garg ec18520f5e tee: optee: Fix supplicant wait loop 
commit 70b0d6b0a1 upstream.

OP-TEE supplicant is a user-space daemon and it's possible for it
be hung or crashed or killed in the middle of processing an OP-TEE
RPC call. It becomes more complicated when there is incorrect shutdown
ordering of the supplicant process vs the OP-TEE client application which
can eventually lead to system hang-up waiting for the closure of the
client application.

Allow the client process waiting in kernel for supplicant response to
be killed rather than indefinitely waiting in an unkillable state. Also,
a normal uninterruptible wait should not have resulted in the hung-task
watchdog getting triggered, but the endless loop would.

This fixes issues observed during system reboot/shutdown when supplicant
got hung for some reason or gets crashed/killed which lead to client
getting hung in an unkillable state. It in turn lead to system being in
hung up state requiring hard power off/on to recover.

Fixes: 4fb0a5eb36 ("tee: add OP-TEE driver")
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Cc: stable@vger.kernel.org
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-03-07 16:56:38 +01:00
..
amdtee tee: amdtee: fix use-after-free vulnerability in amdtee_close_session 2023-10-19 23:08:57 +02:00
optee tee: optee: Fix supplicant wait loop 2025-03-07 16:56:38 +01:00
Kconfig tee: combine "config" and "menu" for TEE's menuconfig 2022-04-05 07:32:23 +02:00
Makefile tee: add AMD-TEE driver 2020-01-04 13:49:51 +08:00
tee_core.c tee: tee_get_drvdata(): fix description of return value 2022-07-08 10:51:24 +02:00
tee_private.h tee: add tee_shm_register_{user,kernel}_buf() 2022-02-16 07:49:41 +01:00
tee_shm.c tee: fix compiler warning in tee_shm_register() 2022-08-25 11:40:06 +02:00
tee_shm_pool.c tee: refactor TEE_SHM_* flags 2022-02-16 07:49:41 +01:00