linux-hardening - Re: [PATCH v3 0/4] binfmt_elf: Support segments with 0 filesz and misaligned starts

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Message-ID: <6208fd50-43cd-85fc-e9a6-f10281a15902@redhat.com>
Date: Thu, 28 Sep 2023 14:55:22 +0200 (CEST)
From: Sebastian Ott <sebott@...hat.com>
To: Kees Cook <keescook@...omium.org>
cc: Eric Biederman <ebiederm@...ssion.com>, 
    Thomas Weißschuh <linux@...ssschuh.net>, 
    Al Viro <viro@...iv.linux.org.uk>, Christian Brauner <brauner@...nel.org>, 
    Pedro Falcato <pedro.falcato@...il.com>, linux-kernel@...r.kernel.org, 
    linux-fsdevel@...r.kernel.org, linux-mm@...ck.org, 
    linux-hardening@...r.kernel.org
Subject: Re: [PATCH v3 0/4] binfmt_elf: Support segments with 0 filesz and
 misaligned starts

On Tue, 26 Sep 2023, Kees Cook wrote:
> This is the continuation of the work Eric started for handling
> "p_memsz > p_filesz" in arbitrary segments (rather than just the last,
> BSS, segment). I've added the suggested changes:
>
> - drop unused "elf_bss" variable
> - report padzero() errors when PROT_WRITE is present
> - refactor load_elf_interp() to use elf_load()
>
> This passes my quick smoke tests, but I'm still trying to construct some
> more complete tests...

I've repeated all my tests with this one - no issues found.

Thanks,
Sebastian