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| author | Eric Biggers <ebiggers@google.com> | 2018-06-18 10:22:37 -0700 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2018-07-01 21:00:41 +0800 |
| commit | 73bf20ef3df262026c3470241ae4ac8196943ffa (patch) | |
| tree | 3bf4d9cfaca73a4a30ff69ce7595564bc558c471 /crypto/vmac.c | |
| parent | 38641b83ebc54635151810eeef00b61da3097952 (diff) | |
| download | lwn-73bf20ef3df262026c3470241ae4ac8196943ffa.tar.gz lwn-73bf20ef3df262026c3470241ae4ac8196943ffa.zip | |
crypto: vmac - require a block cipher with 128-bit block size
The VMAC template assumes the block cipher has a 128-bit block size, but
it failed to check for that. Thus it was possible to instantiate it
using a 64-bit block size cipher, e.g. "vmac(cast5)", causing
uninitialized memory to be used.
Add the needed check when instantiating the template.
Fixes: f1939f7c5645 ("crypto: vmac - New hash algorithm for intel_txt support")
Cc: <stable@vger.kernel.org> # v2.6.32+
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/vmac.c')
| -rw-r--r-- | crypto/vmac.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/crypto/vmac.c b/crypto/vmac.c index df76a816cfb2..3034454a3713 100644 --- a/crypto/vmac.c +++ b/crypto/vmac.c @@ -655,6 +655,10 @@ static int vmac_create(struct crypto_template *tmpl, struct rtattr **tb) if (IS_ERR(alg)) return PTR_ERR(alg); + err = -EINVAL; + if (alg->cra_blocksize != 16) + goto out_put_alg; + inst = shash_alloc_instance("vmac", alg); err = PTR_ERR(inst); if (IS_ERR(inst)) |