[PATCH 04/11] evm: Check size of security.evm before using it

[Mimi Zohar]

On Thu, 2020-06-18 at 18:01 +0200, Roberto Sassu wrote:
> This patch checks the size for the EVM_IMA_XATTR_DIGSIG and
> EVM_XATTR_PORTABLE_DIGSIG types to ensure that the algorithm is read from
> the buffer returned by vfs_getxattr_alloc().
> 
> Cc: stable at vger.kernel.org # 4.19.x
> Fixes: 5feeb61183dde ("evm: Allow non-SHA1 digital signatures")
> Signed-off-by: Roberto Sassu <roberto.sassu at huawei.com>

Reviewed-by: Mimi Zohar <zohar at linux.ibm.com>