[PATCH v10 4/4] evm: Support multiple LSMs providing an xattr

[Mimi Zohar]

On Fri, 2023-03-31 at 14:32 +0200, Roberto Sassu wrote:
> From: Roberto Sassu <roberto.sassu at huawei.com>
> 
> Currently, evm_inode_init_security() processes a single LSM xattr from the
> array passed by security_inode_init_security(), and calculates the HMAC on
> it and other inode metadata.
> 
> As the LSM infrastructure now can pass to EVM an array with multiple
> xattrs, scan them until the terminator (xattr name NULL), and calculate the
> HMAC on all of them.
> 
> Also, double check that the xattrs array terminator is the first non-filled
> slot (obtained with lsm_get_xattr_slot()). Consumers of the xattrs array,
> such as the initxattrs() callbacks, rely on the terminator.
> 
> Finally, change the name of the lsm_xattr parameter of evm_init_hmac() to
> xattrs, to reflect the new type of information passed.
> 
> Signed-off-by: Roberto Sassu <roberto.sassu at huawei.com>

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