linux-kernel - Re: [6.8-rc1 Regression] Unable to exec apparmor

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Message-ID: <CAHk-=wijSFE6+vjv7vCrhFJw=y36RY6zApCA07uD1jMpmmFBfA@mail.gmail.com>
Date: Wed, 24 Jan 2024 08:54:58 -0800
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Kees Cook <keescook@...omium.org>
Cc: Kevin Locke <kevin@...inlocke.name>, John Johansen <john.johansen@...onical.com>, 
	Josh Triplett <josh@...htriplett.org>, Mateusz Guzik <mjguzik@...il.com>, 
	Al Viro <viro@...iv.linux.org.uk>, linux-mm@...ck.org, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [6.8-rc1 Regression] Unable to exec apparmor_parser from virt-aa-helper

On Wed, 24 Jan 2024 at 08:46, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> If the code ends up deciding "is this an exec" based on some state
> flag that hasn't been set, that would explain it.
>
> Something like "current->in_execve", perhaps?

Yeah, that looks like exactly what some of the security layer is testing.

Hmm. That whole thing is disgusting. I think it should have checked
FMODE_EXEC, and I have no idea why it doesn't.

                 Linus