Re: [PATCH] exec: allow executing block devices

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To: Alyssa Ross <hi@xxxxxxxxx>
Subject: Re: [PATCH] exec: allow executing block devices
From: Kees Cook <keescook@xxxxxxxxxxxx>
Date: Wed, 11 Oct 2023 08:59:12 -0700
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, Christian Brauner <brauner@xxxxxxxxxx>, Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>, Eric Biederman <ebiederm@xxxxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <87o7h5vcao.fsf@alyssa.is>
References: <20231010092133.4093612-1-hi@alyssa.is> <202310101535.CEDA4DB84@keescook> <87o7h5vcao.fsf@alyssa.is>

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

References:
- [PATCH] exec: allow executing block devices
  - From: Alyssa Ross
- Re: [PATCH] exec: allow executing block devices
  - From: Kees Cook
- Re: [PATCH] exec: allow executing block devices
  - From: Alyssa Ross

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