linux-kernel - [PATCH RFC v2 bootconfig 0/3] Distinguish bootloader and embedded kernel parameters

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <db98cbbf-2205-40d2-9fa1-f1c135cc151c@paulmck-laptop>
Date:   Mon, 31 Jul 2023 16:30:09 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     akpm@...ux-foundation.org, adobriyan@...il.com, mhiramat@...nel.org
Cc:     arnd@...nel.org, ndesaulniers@...gle.com, sfr@...b.auug.org.au,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...a.com
Subject: [PATCH RFC v2 bootconfig 0/3] Distinguish bootloader and embedded
 kernel parameters

On Thu, Jul 27, 2023 at 08:35:10PM -0700, Paul E. McKenney wrote:
Hello!

This series provides a /proc interface parallel to /proc/cmdline that
provides only those kernel boot parameters that were provided by the
bootloader in a new /proc/cmdline_load.  This is especially important
when these parameters are presented to the boot loader by automation
that might gather them from diverse sources, and also when a kexec-based
reboot process pulls the kernel boot parameters from /proc.  If such a
reboot process uses /proc/cmdline, the kernel parameters from the image
are replicated on every reboot, which can be frustrating when the new
kernel has different embedded kernel boot parameters.

Why put these in /proc?  Because they is quite similar to /proc/cmdline,
so it makes sense to put it in the same place that /proc/cmdline is
located.

1.	Update /proc/cmdline documentation to include boot config.

2.	fs/proc: Add /proc/cmdline_load for boot loader arguments.

3.	Add /proc/bootconfig to proc.rst.

Changes since v1:

o	Dropped /proc/cmdline_image in favor of the existing
	/proc/bootconfig.

o	Pulled in fixes from Stephen and Arnd.

o	Added documentation for /proc/bootconfig.

						Thanx, Paul

------------------------------------------------------------------------

 Documentation/filesystems/proc.rst   |    2 ++
 b/Documentation/filesystems/proc.rst |    3 ++-
 b/fs/proc/cmdline.c                  |   13 +++++++++++++
 b/include/linux/init.h               |    3 ++-
 b/init/main.c                        |    2 +-
 5 files changed, 20 insertions(+), 3 deletions(-)