This is a note to let you know that I've just added the patch titled
crypto: cryptd - disable softirqs in cryptd_queue_worker to prevent data
corruption
to the 3.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
crypto-cryptd-disable-softirqs-in-cryptd_queue_worker-to-prevent-data-corruption.patch
and it can be found in the queue-3.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 9efade1b3e981f5064f9db9ca971b4dc7557ae42 Mon Sep 17 00:00:00 2001
From: Jussi Kivilinna <[email protected]>
Date: Sun, 21 Oct 2012 20:42:28 +0300
Subject: crypto: cryptd - disable softirqs in cryptd_queue_worker to prevent
data corruption
From: Jussi Kivilinna <[email protected]>
commit 9efade1b3e981f5064f9db9ca971b4dc7557ae42 upstream.
cryptd_queue_worker attempts to prevent simultaneous accesses to crypto
workqueue by cryptd_enqueue_request using preempt_disable/preempt_enable.
However cryptd_enqueue_request might be called from softirq context,
so add local_bh_disable/local_bh_enable to prevent data corruption and
panics.
Bug report at http://marc.info/?l=linux-crypto-vger&m=134858649616319&w=2
v2:
- Disable software interrupts instead of hardware interrupts
Reported-by: Gurucharan Shetty <[email protected]>
Signed-off-by: Jussi Kivilinna <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
crypto/cryptd.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
--- a/crypto/cryptd.c
+++ b/crypto/cryptd.c
@@ -137,13 +137,18 @@ static void cryptd_queue_worker(struct w
struct crypto_async_request *req, *backlog;
cpu_queue = container_of(work, struct cryptd_cpu_queue, work);
- /* Only handle one request at a time to avoid hogging crypto
- * workqueue. preempt_disable/enable is used to prevent
- * being preempted by cryptd_enqueue_request() */
+ /*
+ * Only handle one request at a time to avoid hogging crypto workqueue.
+ * preempt_disable/enable is used to prevent being preempted by
+ * cryptd_enqueue_request(). local_bh_disable/enable is used to prevent
+ * cryptd_enqueue_request() being accessed from software interrupts.
+ */
+ local_bh_disable();
preempt_disable();
backlog = crypto_get_backlog(&cpu_queue->queue);
req = crypto_dequeue_request(&cpu_queue->queue);
preempt_enable();
+ local_bh_enable();
if (!req)
return;
Patches currently in stable-queue which might be from [email protected]
are
queue-3.6/crypto-cryptd-disable-softirqs-in-cryptd_queue_worker-to-prevent-data-corruption.patch
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