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| author | Sowmini Varadhan <sowmini.varadhan@oracle.com> | 2015-10-13 10:54:01 -0400 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2015-10-14 22:23:38 +0800 |
| commit | 62f57d05e287e950c6e1246b1dba08e12985195a (patch) | |
| tree | e1db73de0c2d95dff6ce1e43909662a31ccc1f99 /crypto | |
| parent | 5a4eea2658c933205cd014b87066f3faa2dbe7f7 (diff) | |
| download | lwn-62f57d05e287e950c6e1246b1dba08e12985195a.tar.gz lwn-62f57d05e287e950c6e1246b1dba08e12985195a.zip | |
crypto: pkcs7 - Fix unaligned access in pkcs7_verify()
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@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/asymmetric_keys/pkcs7_verify.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/crypto/asymmetric_keys/pkcs7_verify.c b/crypto/asymmetric_keys/pkcs7_verify.c index d20c0b4b880e..325575caf6b4 100644 --- a/crypto/asymmetric_keys/pkcs7_verify.c +++ b/crypto/asymmetric_keys/pkcs7_verify.c @@ -49,11 +49,12 @@ static int pkcs7_digest(struct pkcs7_message *pkcs7, sinfo->sig.digest_size = digest_size = crypto_shash_digestsize(tfm); ret = -ENOMEM; - digest = kzalloc(digest_size + desc_size, GFP_KERNEL); + digest = kzalloc(ALIGN(digest_size, __alignof__(*desc)) + desc_size, + GFP_KERNEL); if (!digest) goto error_no_desc; - desc = digest + digest_size; + desc = PTR_ALIGN(digest + digest_size, __alignof__(*desc)); desc->tfm = tfm; desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; |