linux-kernel - Re: [PATCH] binfmt_elf: Support segments with 0 filesz and misaligned starts

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Message-ID: <84e974d3-ae0d-9eb5-49b2-3348b7dcd336@redhat.com>
Date:   Mon, 25 Sep 2023 17:27:12 +0200 (CEST)
From:   Sebastian Ott <sebott@...hat.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
cc:     Thomas Weißschuh <linux@...ssschuh.net>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Mark Brown <broonie@...nel.org>, Willy Tarreau <w@....eu>,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] binfmt_elf: Support segments with 0 filesz and misaligned
 starts

On Mon, 25 Sep 2023, Eric W. Biederman wrote:
>
> Implement a helper elf_load that wraps elf_map and performs all
> of the necessary work to ensure that when "memsz > filesz"
> the bytes described by "memsz > filesz" are zeroed.
>
> Link: https://lkml.kernel.org/r/20230914-bss-alloc-v1-1-78de67d2c6dd@weissschuh.net
> Reported-by: Sebastian Ott <sebott@...hat.com>
> Reported-by: Thomas Weißschuh <linux@...ssschuh.net>
> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
> ---
> fs/binfmt_elf.c | 111 +++++++++++++++++++++---------------------------
> 1 file changed, 48 insertions(+), 63 deletions(-)
>
> Can you please test this one?
>

That one did the trick! The arm box booted successful, ran the binaries
that were used for the repo of this issue, and ran the nolibc compiled
binaries from kselftests that initially triggered the loader issues.

Thanks,
Sebastian