linux-kernel - [PATCH v2 0/2] exec: Avoid pathological argc, envc, and bprm->p values

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Date: Fri, 21 Jun 2024 13:50:42 -0700
From: Kees Cook <kees@...nel.org>
To: Guenter Roeck <linux@...ck-us.net>
Cc: Kees Cook <kees@...nel.org>,
	Eric Biederman <ebiederm@...ssion.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Laurent Vivier <laurent@...ier.eu>,
	Lukas Bulwahn <lukas.bulwahn@...il.com>,
	Justin Stitt <justinstitt@...gle.com>,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH v2 0/2] exec: Avoid pathological argc, envc, and bprm->p values

Hi,

This pair of patches replaces the last patch in this[1] series.

Perform bprm argument overflow checking but only do argmin checks for MMU
systems. To avoid tripping over this again, argmin is explicitly defined
only for CONFIG_MMU. Thank you to Guenter Roeck for finding this issue
(again)!

-Kees

[1] https://lore.kernel.org/all/20240520021337.work.198-kees@kernel.org/

Kees Cook (2):
  execve: Keep bprm->argmin behind CONFIG_MMU
  exec: Avoid pathological argc, envc, and bprm->p values

 fs/exec.c               | 36 +++++++++++++++++++++++++++++-------
 fs/exec_test.c          | 30 +++++++++++++++++++++++++++++-
 include/linux/binfmts.h |  2 +-
 3 files changed, 59 insertions(+), 9 deletions(-)

-- 
2.34.1