Re: [PATCH v2 5/8] exec: Move the call of prepare_binprm into search_binary_handler

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To: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Subject: Re: [PATCH v2 5/8] exec: Move the call of prepare_binprm into search_binary_handler
From: Kees Cook <keescook@xxxxxxxxxxxx>
Date: Tue, 19 May 2020 11:27:51 -0700
Cc: linux-kernel@xxxxxxxxxxxxxxx, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>, Jann Horn <jannh@xxxxxxxxxx>, Greg Ungerer <gerg@xxxxxxxxxxxxxx>, Rob Landley <rob@xxxxxxxxxxx>, Bernd Edlinger <bernd.edlinger@xxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, Al Viro <viro@xxxxxxxxxxxxxxxxxx>, Alexey Dobriyan <adobriyan@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Casey Schaufler <casey@xxxxxxxxxxxxxxxx>, linux-security-module@xxxxxxxxxxxxxxx, James Morris <jmorris@xxxxxxxxx>, "Serge E. Hallyn" <serge@xxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxxxxxx>
In-reply-to: <87d070zrvx.fsf_-_@x220.int.ebiederm.org>

On Mon, May 18, 2020 at 07:32:18PM -0500, Eric W. Biederman wrote:
> 
> The code in prepare_binary_handler needs to be run every time
> search_binary_handler is called so move the call into search_binary_handler
> itself to make the code simpler and easier to understand.
> 
> Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>

Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>

-- 
Kees Cook

References:
- exec: Promised cleanups after introducing exec_update_mutex
  - From: Eric W. Biederman
- [PATCH 0/6] exec: Trivial cleanups for exec
  - From: Eric W. Biederman
- [PATCH 0/5] exec: Control flow simplifications
  - From: Eric W. Biederman
- [PATCH v2 0/8] exec: Control flow simplifications
  - From: Eric W. Biederman
- [PATCH v2 5/8] exec: Move the call of prepare_binprm into search_binary_handler
  - From: Eric W. Biederman

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