linux-hardening - Re: [PATCH] binfmt_elf: Introduce KUnit test

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Message-ID: <YhdTrXhu6sgi35WQ@localhost.localdomain>
Date:   Thu, 24 Feb 2022 12:45:17 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Eric Biederman <ebiederm@...ssion.com>,
        David Gow <davidgow@...gle.com>,
        Magnus Groß <magnus.gross@...h-aachen.de>,
        kunit-dev@...glegroups.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] binfmt_elf: Introduce KUnit test

On Wed, Feb 23, 2022 at 09:43:32PM -0800, Kees Cook wrote:
> Adds simple KUnit test for some binfmt_elf internals: specifically a
> regression test for the problem fixed by commit 8904d9cd90ee ("ELF:
> fix overflow in total mapping size calculation").

This can be tested by small 2 segment program run from userspace.
Make 2 segments, swap them, and see executable rejected because mmap
gets too big an area.

	PT_ALEXEY