linux-kernel - Re: [PATCH v2] devtmpfs: mount with noexec and nosuid

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Message-ID: <CAPXgP126a0Wqw2NtkAAo6eqd1tvQyjLE0Kh=de3Cs2bd90K+8g@mail.gmail.com>
Date:	Wed, 21 Nov 2012 01:13:42 +0100
From:	Kay Sievers <kay@...y.org>
To:	Kees Cook <keescook@...omium.org>
Cc:	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	ellyjones@...omium.org, Roland Eggner <edvx1@...temanalysen.net>
Subject: Re: [PATCH v2] devtmpfs: mount with noexec and nosuid

On Tue, Nov 20, 2012 at 9:42 PM, Kees Cook <keescook@...omium.org> wrote:
> Since devtmpfs is writable, make the default noexec,nosuid as well. This
> protects from the case of a privileged process having an arbitrary file
> write flaw and an argumentless arbitrary execution (i.e. it would lack
> the ability to run "mount -o remount,exec,suid /dev").

This only really applies to systems without an initramfs when the
kernel mounts /dev over the rootfs it has mounted; with an initramfs,
/dev is always mounted by user code.

Just checking, that is the use case you are doing that for?

Kay
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