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[CRYPTO] all: Check for usage in hard IRQ context

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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>
This commit is contained in:
Herbert Xu 2006-12-10 10:45:28 +11:00
parent 62d0cfcb27
commit fb469840b8
3 changed files with 37 additions and 7 deletions
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4
crypto/blkcipher.c
View file

@ -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;

19
crypto/digest.c
View file

@ -14,7 +14,9 @@
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/hardirq.h>
#include <linux/highmem.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
@ -29,8 +31,8 @@ static int init(struct hash_desc *desc)
return 0;
}
static int update(struct hash_desc *desc,
struct scatterlist *sg, unsigned int nbytes)
static int update2(struct hash_desc *desc,
struct scatterlist *sg, unsigned int nbytes)
{
struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
unsigned int alignmask = crypto_tfm_alg_alignmask(tfm);
@ -81,6 +83,14 @@ static int update(struct hash_desc *desc,
return 0;
}
static int update(struct hash_desc *desc,
struct scatterlist *sg, unsigned int nbytes)
{
if (WARN_ON_ONCE(in_irq()))
return -EDEADLK;
return update2(desc, sg, nbytes);
}
static int final(struct hash_desc *desc, u8 *out)
{
struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
@ -118,8 +128,11 @@ static int setkey(struct crypto_hash *hash, const u8 *key, unsigned int keylen)
static int digest(struct hash_desc *desc,
struct scatterlist *sg, unsigned int nbytes, u8 *out)
{
if (WARN_ON_ONCE(in_irq()))
return -EDEADLK;
init(desc);
update(desc, sg, nbytes);
update2(desc, sg, nbytes);
return final(desc, out);
}

21
crypto/xcbc.c
View file

@ -21,6 +21,7 @@
#include <linux/crypto.h>
#include <linux/err.h>
#include <linux/hardirq.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/rtnetlink.h>
@ -108,9 +109,9 @@ static int crypto_xcbc_digest_init(struct hash_desc *pdesc)
return 0;
}
static int crypto_xcbc_digest_update(struct hash_desc *pdesc,
struct scatterlist *sg,
unsigned int nbytes)
static int crypto_xcbc_digest_update2(struct hash_desc *pdesc,
struct scatterlist *sg,
unsigned int nbytes)
{
struct crypto_hash *parent = pdesc->tfm;
struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent);
@ -183,6 +184,15 @@ static int crypto_xcbc_digest_update(struct hash_desc *pdesc,
return 0;
}
static int crypto_xcbc_digest_update(struct hash_desc *pdesc,
struct scatterlist *sg,
unsigned int nbytes)
{
if (WARN_ON_ONCE(in_irq()))
return -EDEADLK;
return crypto_xcbc_digest_update2(pdesc, sg, nbytes);
}
static int crypto_xcbc_digest_final(struct hash_desc *pdesc, u8 *out)
{
struct crypto_hash *parent = pdesc->tfm;
@ -234,8 +244,11 @@ static int crypto_xcbc_digest_final(struct hash_desc *pdesc, u8 *out)
static int crypto_xcbc_digest(struct hash_desc *pdesc,
struct scatterlist *sg, unsigned int nbytes, u8 *out)
{
if (WARN_ON_ONCE(in_irq()))
return -EDEADLK;
crypto_xcbc_digest_init(pdesc);
crypto_xcbc_digest_update(pdesc, sg, nbytes);
crypto_xcbc_digest_update2(pdesc, sg, nbytes);
return crypto_xcbc_digest_final(pdesc, out);
}