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authorHerbert Xu <herbert@gondor.apana.org.au>2006-12-10 10:45:28 +1100
committerHerbert Xu <herbert@gondor.apana.org.au>2007-02-07 09:20:58 +1100
commitfb469840b8c34b2f95b40a64b271f245cc1075b7 (patch)
tree8013f8beb39c83b80be0e40195005b0482cea69b /crypto/blkcipher.c
parent62d0cfcb27cf755cebdc93ca95dabc83608007cd (diff)
downloadlinux-fb469840b8c34b2f95b40a64b271f245cc1075b7.tar.bz2
[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 <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/blkcipher.c')
-rw-r--r--crypto/blkcipher.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c
index 6e93004f2181..cbb4c4e5c229 100644
--- a/crypto/blkcipher.c
+++ b/crypto/blkcipher.c
@@ -16,6 +16,7 @@
#include <linux/crypto.h>
#include <linux/errno.h>
+#include <linux/hardirq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
@@ -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;