This is a note to let you know that I've just added the patch titled
crypto: api - Fix race condition in larval lookup
to the 3.0-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-api-fix-race-condition-in-larval-lookup.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 77dbd7a95e4a4f15264c333a9e9ab97ee27dc2aa Mon Sep 17 00:00:00 2001
From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Date: Sun, 8 Sep 2013 14:33:50 +1000
Subject: crypto: api - Fix race condition in larval lookup
From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
commit 77dbd7a95e4a4f15264c333a9e9ab97ee27dc2aa upstream.
crypto_larval_lookup should only return a larval if it created one.
Any larval created by another entity must be processed through
crypto_larval_wait before being returned.
Otherwise this will lead to a larval being killed twice, which
will most likely lead to a crash.
Reported-by: Kees Cook <keescook@xxxxxxxxxxxx>
Tested-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
crypto/api.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -40,6 +40,8 @@ static inline struct crypto_alg *crypto_
return alg;
}
+static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg);
+
struct crypto_alg *crypto_mod_get(struct crypto_alg *alg)
{
return try_module_get(alg->cra_module) ? crypto_alg_get(alg) : NULL;
@@ -150,8 +152,11 @@ static struct crypto_alg *crypto_larval_
}
up_write(&crypto_alg_sem);
- if (alg != &larval->alg)
+ if (alg != &larval->alg) {
kfree(larval);
+ if (crypto_is_larval(alg))
+ alg = crypto_larval_wait(alg);
+ }
return alg;
}
Patches currently in stable-queue which might be from herbert@xxxxxxxxxxxxxxxxxxx are
queue-3.0/crypto-api-fix-race-condition-in-larval-lookup.patch
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