Rijo Thomas 1680c82929 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 23:05:37 +02:00
..
amdtee	tee: amdtee: fix use-after-free vulnerability in amdtee_close_session	2023-10-19 23:05:37 +02:00
optee	tee: optee: fix possible memory leak in optee_register_device()	2022-12-02 17:41:03 +01:00
Kconfig	tee: fix crypto select	2020-05-28 12:38:00 +02:00
Makefile	tee: add AMD-TEE driver	2020-01-04 13:49:51 +08:00
tee_core.c	tee: Fix tee_shm_register() for kernel TEE drivers	2022-11-10 18:15:42 +01:00
tee_private.h	tee: don't assign shm id for private shms	2020-02-28 13:37:42 +01:00
tee_shm.c	tee: Fix tee_shm_register() for kernel TEE drivers	2022-11-10 18:15:42 +01:00
tee_shm_pool.c	…