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Message-ID: <988555a2-bed9-234c-843c-0bb68dc60d3f@nmatt.com>
Date: Thu, 13 Jul 2017 08:39:47 -0400
From: Matt Brown <matt@...tt.com>
To: Mimi Zohar <zohar@...ux.vnet.ibm.com>,
Salvatore Mesoraca <s.mesoraca16@...il.com>, Mickaël Salaün <mic@...ikod.net>
Cc: kernel list <linux-kernel@...r.kernel.org>,
linux-security-module <linux-security-module@...r.kernel.org>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Brad Spengler <spender@...ecurity.net>, PaX Team <pageexec@...email.hu>,
Casey Schaufler <casey@...aufler-ca.com>, Kees Cook <keescook@...omium.org>,
James Morris <james.l.morris@...cle.com>, "Serge E. Hallyn"
<serge@...lyn.com>
Subject: Re: [PATCH 00/11] S.A.R.A. a new stacked LSM
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:
>> https://github.com/nmatt0/linux-security/tree/tpe/security/tpe
>>
>> 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?
Matt
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