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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2022-05-04 18:07:36 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-14 19:11:41 +0300 |
| commit | 6d7b2cf5c7ed875f78c5a095bd1b5255ea53eec6 (patch) | |
| tree | 1c695a93818cca50cc46a20758bdb85a732f8a28 /drivers | |
| parent | 3219ac364ac3d8d30771612a6010f1e0b7fa0a28 (diff) | |
| download | linux-6d7b2cf5c7ed875f78c5a095bd1b5255ea53eec6.tar.xz | |
crypto: cryptd - Protect per-CPU resource by disabling BH.
[ Upstream commit 91e8bcd7b4da182e09ea19a2c73167345fe14c98 ]
The access to cryptd_queue::cpu_queue is synchronized by disabling
preemption in cryptd_enqueue_request() and disabling BH in
cryptd_queue_worker(). This implies that access is allowed from BH.
If cryptd_enqueue_request() is invoked from preemptible context _and_
soft interrupt then this can lead to list corruption since
cryptd_enqueue_request() is not protected against access from
soft interrupt.
Replace get_cpu() in cryptd_enqueue_request() with local_bh_disable()
to ensure BH is always disabled.
Remove preempt_disable() from cryptd_queue_worker() since it is not
needed because local_bh_disable() ensures synchronisation.
Fixes: 254eff771441 ("crypto: cryptd - Per-CPU thread implementation...")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers')
0 files changed, 0 insertions, 0 deletions