liveupdate: fix TOCTOU race in luo_session_retrieve()

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Extend the scope of the rwsem_read lock in luo_session_retrieve() to
overlap with the acquisition of the session mutex. This prevents a
concurrent thread from releasing and freeing the session between the
lookup and the mutex lock.

Fixes: 0153094d03 ("liveupdate: luo_session: add sessions support")
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Pratyush Yadav (Google) <pratyush@kernel.org>
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Link: https://patch.msgid.link/20260527202737.1345192-3-pasha.tatashin@soleen.com
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

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Pasha Tatashin 2026-05-27 20:27:34 +00:00 • committed by Mike Rapoport (Microsoft)

parent 5eff62b051

commit d3ae9e7fdd

1 changed files with 5 additions and 6 deletions

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kernel/liveupdate/luo_session.c

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