Rijo Thomas 1c95574350 tee: amdtee: fix use-after-free vulnerability in amdtee_close_session ... commit f4384b3e54 upstream. There is a potential race condition in amdtee_close_session that may cause use-after-free in amdtee_open_session. For instance, if a session has refcount == 1, and one thread tries to free this session via: kref_put(&sess->refcount, destroy_session); the reference count will get decremented, and the next step would be to call destroy_session(). However, if in another thread, amdtee_open_session() is called before destroy_session() has completed execution, alloc_session() may return 'sess' that will be freed up later in destroy_session() leading to use-after-free in amdtee_open_session. To fix this issue, treat decrement of sess->refcount and removal of 'sess' from session list in destroy_session() as a critical section, so that it is executed atomically. Fixes: 757cc3e9ff ("tee: add AMD-TEE driver") Cc: stable@vger.kernel.org Signed-off-by: Rijo Thomas <Rijo-john.Thomas@amd.com> Reviewed-by: Sumit Garg <sumit.garg@linaro.org> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-10-19 23:11:06 +02:00
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amdtee	tee: amdtee: fix use-after-free vulnerability in amdtee_close_session	2023-10-19 23:11:06 +02:00
optee	ARM: SoC drivers for 6.5	2023-06-29 15:22:19 -07:00
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	driver core: class: remove module * from class_create()	2023-03-17 15:16:33 +01:00
tee_private.h	tee: add tee_shm_register_{user,kernel}_buf()	2022-02-16 07:49:41 +01:00
tee_shm.c	tee: Pass a pointer to virt_to_page()	2023-03-30 08:34:52 +02:00
tee_shm_pool.c	tee: refactor TEE_SHM_* flags	2022-02-16 07:49:41 +01:00