linux-kernel - Re: [PATCH v3] binfmt_elf: Dump smaller VMAs first in ELF cores

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Message-ID: <F859FAC0-294F-4FA7-BAA1-6EBC373F035A@juniper.net>
Date: Wed, 19 Feb 2025 20:38:51 +0000
From: Brian Mak <makb@...iper.net>
To: Kees Cook <kees@...nel.org>
CC: Jan Kara <jack@...e.cz>, Michael Stapelberg <michael@...pelberg.ch>,
        Christian Brauner <brauner@...nel.org>,
        "Eric W. Biederman"
	<ebiederm@...ssion.com>,
        "linux-fsdevel@...r.kernel.org"
	<linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Linus Torvalds
	<torvalds@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v3] binfmt_elf: Dump smaller VMAs first in ELF cores

On Feb 19, 2025, at 11:52 AM, Kees Cook <kees@...nel.org> wrote:

> Yeah, I think we need to make this a tunable. Updating the kernel breaks
> elftools, which isn't some weird custom corner case. :P
> 
> So, while it took a few months, here is a report of breakage that I said
> we'd need to watch for[1]. :)
> 
> Is anyone able to test this patch? And Brian will setting a sysctl be
> okay for your use-case?

Hi Kees,

Yes, a sysctl tunable would be good here. I can test this patch in the
next day or two.

I will also scratch up a patch to bring us back into compliance with the
ELF specifications, and see if that fixes the userspace breakage with
elfutils, while not breaking gdb or rr.

Thanks,
Brian