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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2022-05-04 17:07:36 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2022-05-13 17:24:48 +0800 |
| commit | 5924aba1f50fe48ccb7d890098e13180a414d88c (patch) | |
| tree | 984d66288755e37c2f7893e54b64f2767d04eb64 /crypto/xts.c | |
| parent | 1102a510e1a2c04721d5bfeff8f2c70546d76289 (diff) | |
| download | linux-crypto-5924aba1f50fe48ccb7d890098e13180a414d88c.tar.gz linux-crypto-5924aba1f50fe48ccb7d890098e13180a414d88c.zip | |
crypto: cryptd - Protect per-CPU resource by disabling BH.
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: a045a18f0207 ("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>
Diffstat (limited to 'crypto/xts.c')
0 files changed, 0 insertions, 0 deletions