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

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Message-ID: <202502220712.D7B251910A@keescook>
Date: Sat, 22 Feb 2025 07:15:28 -0800
From: Kees Cook <kees@...nel.org>
To: Brian Mak <makb@...iper.net>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>, 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>,
	Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v3] binfmt_elf: Dump smaller VMAs first in ELF cores

On Thu, Feb 20, 2025 at 10:59:06PM +0000, Brian Mak wrote:
> One thing we can do though is to iterate through the pages for all VMAs
> and see if get_dump_page() returns NULL. Then, we use that information
> to calculate a more accurate predicted core dump size.
> 
> Patch is below. Thoughts?

I've pushed this to -next for a few days of testing, and if it's all
good, I'll send it to Linus next week for -rc5 (and -stable).

https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/commit/?h=for-linus/execve&id=ff41385709f01519a97379ce7671ee4e91e301e1

-Kees

-- 
Kees Cook