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

nvdimm/btt: Handle preemption in BTT lane acquisition

BTT lanes serialize access to per-lane metadata and workspace state
during BTT I/O. The btt-check unit test reports data mismatches during
BTT writes due to a race in lane acquisition that can lead to silent
data corruption.

The existing lane model uses a spinlock together with a per-CPU
recursion count. That recursion model stopped being valid after BTT
lanes became preemptible: another task can run on the same CPU,
observe a non-zero recursion count, bypass locking, and use the same
lane concurrently.

BTT lanes are also held across arena_write_bytes() calls. That path
reaches nsio_rw_bytes(), which flushes writes with nvdimm_flush().
Some provider flush callbacks can sleep, making a spinlock the wrong
primitive for the lane lifetime.

Replace the spinlock-based recursion model with a dynamically
allocated per-lane mutex array and take the lane lock
unconditionally.

Add might_sleep() to catch any future atomic-context caller.

Found with the ndctl unit test btt-check.sh.

https://git.kernel.org/stable/c/417918783bcfe0be135019df16a267b3af442efd

https://git.kernel.org/stable/c/4eafa810b042d985ec6bbf5b514414e73cee6f6f

https://git.kernel.org/stable/c/5c53406098b599c420b031e6ec5ba8a2f3794c50

https://git.kernel.org/stable/c/73e35c1bdfa160b41fdbe204e02325f0687de506

https://git.kernel.org/stable/c/8d4b989d9c9afe5f185aa5853b666fc4617afe9e

https://git.kernel.org/stable/c/fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735

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