linux-kernel - Re: [PATCH 01/10] security: Override creds in __fput() with last fputter's creds [ver #3]

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Date:   Thu, 6 Jun 2019 07:57:27 -0700
From:   Andy Lutomirski <luto@...capital.net>
To:     David Howells <dhowells@...hat.com>
Cc:     viro@...iv.linux.org.uk, Casey Schaufler <casey@...aufler-ca.com>,
        raven@...maw.net, linux-fsdevel@...r.kernel.org,
        linux-api@...r.kernel.org, linux-block@...r.kernel.org,
        keyrings@...r.kernel.org, linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/10] security: Override creds in __fput() with last fputter's creds [ver #3]



> On Jun 6, 2019, at 2:42 AM, David Howells <dhowells@...hat.com> wrote:
> 
> So that the LSM can see the credentials of the last process to do an fput()
> on a file object when the file object is being dismantled, do the following
> steps:
> 

I still maintain that this is a giant design error. Can someone at least come up with a single valid use case that isn’t entirely full of bugs?