Vulnerability CVE-2023-52503
Published: 2024-03-02

Description:
In the Linux kernel, the following vulnerability has been resolved:

tee: amdtee: fix use-after-free vulnerability in amdtee_close_session

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.

 References:
https://git.kernel.org/stable/c/da7ce52a2f6c468946195b116615297d3d113a27
https://git.kernel.org/stable/c/1680c82929bc14d706065f123dab77f2f1293116
https://git.kernel.org/stable/c/60c3e7a00db954947c265b55099c21b216f2a05c
https://git.kernel.org/stable/c/1c95574350cd63bc3c5c2fa06658010768f2a0ce
https://git.kernel.org/stable/c/f4384b3e54ea813868bb81a861bf5b2406e15d8f
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