From fb469840b8c34b2f95b40a64b271f245cc1075b7 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Sun, 10 Dec 2006 10:45:28 +1100 Subject: [CRYPTO] all: Check for usage in hard IRQ context Using blkcipher/hash crypto operations in hard IRQ context can lead to random memory corruption due to the reuse of kmap_atomic slots. Since crypto operations were never meant to be used in hard IRQ contexts, this patch checks for such usage and returns an error before kmap_atomic is performed. Signed-off-by: Herbert Xu --- crypto/blkcipher.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'crypto/blkcipher.c') diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c index 6e93004f218..cbb4c4e5c22 100644 --- a/crypto/blkcipher.c +++ b/crypto/blkcipher.c @@ -16,6 +16,7 @@ #include #include +#include #include #include #include @@ -313,6 +314,9 @@ static int blkcipher_walk_first(struct blkcipher_desc *desc, struct crypto_blkcipher *tfm = desc->tfm; unsigned int alignmask = crypto_blkcipher_alignmask(tfm); + if (WARN_ON_ONCE(in_irq())) + return -EDEADLK; + walk->nbytes = walk->total; if (unlikely(!walk->total)) return 0; -- cgit v1.2.3-70-g09d2