[PATCH v3 13/25] security: Introduce inode_post_removexattr hook

[Mimi Zohar]

On Mon, 2023-09-04 at 15:34 +0200, Roberto Sassu wrote:
> From: Roberto Sassu <roberto.sassu at huawei.com>
> 
> In preparation for moving IMA and EVM to the LSM infrastructure, introduce
> the inode_post_removexattr hook.
> 
> It is useful for EVM to recalculate the HMAC on the remaining file xattrs,
> and other file metadata, after it verified the HMAC of current file
> metadata with the inode_removexattr hook.
> 
> LSMs should use the new hook instead of inode_removexattr, when they need
> to know that the operation was done successfully (not known in
> inode_removexattr). 

> The new hook cannot return an error and cannot cause
> the operation to be reverted.
> 
> Signed-off-by: Roberto Sassu <roberto.sassu at huawei.com>

Refer to the patch description comments for 12/25.

Otherwise,

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