linux-kernel - Re: [PATCH] exec: allow executing block devices

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Message-ID: <202310110857.522FAFCA@keescook>
Date:   Wed, 11 Oct 2023 08:59:12 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Alyssa Ross <hi@...ssa.is>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Eric Biederman <ebiederm@...ssion.com>,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] exec: allow executing block devices

On Wed, Oct 11, 2023 at 07:38:39AM +0000, Alyssa Ross wrote:
> Is it possible to have a file-backed memfd?  Strange name if so! 

Not that I'm aware, but a program could just read the ELF from the block
device and stick it in a memfd and execute the result.

-- 
Kees Cook