Re: [PATCH] crypto/pkcs7_verify: Fix unaligned access in pkcs7_verify()

From: David Howells
Date: Thu Oct 15 2015 - 11:16:15 EST


Sowmini Varadhan <sowmini.varadhan@xxxxxxxxxx> wrote:

> On sparc, we see unaligned access messages on each modprobe[-r]:
>
> Kernel unaligned access at TPC[6ad9b4] pkcs7_verify [..]
> Kernel unaligned access at TPC[6a5484] crypto_shash_finup [..]
> Kernel unaligned access at TPC[6a5390] crypto_shash_update [..]
> Kernel unaligned access at TPC[10150308] sha1_sparc64_update [..]
> Kernel unaligned access at TPC[101501ac] __sha1_sparc64_update [..]
>
> These ware triggered by mod_verify_sig() invocations of pkcs_verify(), and
> are are being caused by an unaligned desc at (sha1, digest_size is 0x14)
> desc = digest + digest_size;
>
> To fix this, pkcs7_verify needs to make sure that desc is pointing
> at an aligned value past the digest_size, and kzalloc appropriately,
> taking alignment values into consideration.
>
> Signed-off-by: Sowmini Varadhan <sowmini.varadhan@xxxxxxxxxx>

Acked-by: David Howells <dhowells@xxxxxxxxxx>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/