Re: [kernel-hardening] [PATCH 00/11] S.A.R.A. a new stacked LSM

From: Matt Brown
Date: Thu Jul 13 2017 - 08:40:07 EST

On 7/11/17 3:31 PM, Mimi Zohar wrote:
> On Tue, 2017-07-11 at 13:49 -0400, Matt Brown wrote:
>> I have merged my TPE LSM with Mimi Zohar's shebang LSM and will be
>> releasing a version 3 soon. I have also added securityfs support to
>> shebang that will allow users to update the interpreter list at run
>> time. This allows for user's to configure TPE/Shebang without any
>> xattrs. For a preview of my version 3 you can check out my dev tree
>> here:
>> Note: that git tree is WIP and may not have all of the attribution and
>> documentation needed.
> You'll want to detect when an interpreter is deleted or renamed. I
> would define security_inode_rename, security_path_rename,
> security_inode_unlink and security_path_unlink hooks.
> "rename" could be an indication that the existing interpreter is being
> updated. "unlink" indicates that the interpreter has been deleted. At
> either of these points, you'll want to start checking for the creation
> of a new file with the expected pathname.
> Mimi

Would it be better just to check for paths rather than inodes?