Vulnerability CVE-2024-42250
Published: 2024-08-07

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

cachefiles: add missing lock protection when polling

Add missing lock protection in poll routine when iterating xarray,
otherwise:

Even with RCU read lock held, only the slot of the radix tree is
ensured to be pinned there, while the data structure (e.g. struct
cachefiles_req) stored in the slot has no such guarantee. The poll
routine will iterate the radix tree and dereference cachefiles_req
accordingly. Thus RCU read lock is not adequate in this case and
spinlock is needed here.

 References:
https://git.kernel.org/stable/c/97cfd5e20ddc2e33e16ce369626ce76c9a475fd7
https://git.kernel.org/stable/c/6bb6bd3dd6f382dfd36220d4b210a0c77c066651
https://git.kernel.org/stable/c/8eadcab7f3dd809edbe5ae20533ff843dfea3a07
https://git.kernel.org/stable/c/cf5bb09e742a9cf6349127e868329a8f69b7a014
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