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: <20221129093245.599903e7@gandalf.local.home>
Date:   Tue, 29 Nov 2022 09:32:45 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Philipp Rudo <prudo@...hat.com>
Cc:     Ricardo Ribalda <ribalda@...omium.org>,
        Eric Biederman <ebiederm@...ssion.com>,
        Jonathan Corbet <corbet@....net>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
        Ross Zwisler <zwisler@...nel.org>, linux-doc@...r.kernel.org,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>
Subject: Re: [PATCH v1 2/2] kexec: Introduce kexec_reboot_disabled

On Tue, 29 Nov 2022 14:44:50 +0100
Philipp Rudo <prudo@...hat.com> wrote:

> An alternative approach and sort of compromise I see is to convert
> kexec_load_disabled from a simple on/off switch to a counter on how
> often a kexec load can be made (in practice a tristate on/off/one-shot
> should be sufficient). Ideally the reboot and panic path will
> have separate counters. With that you could for example use
> kexec_load_limit.reboot=0 and kexec_load_limit.panic=1 to disable the
> load of images for reboot while still allow to load a crash kernel
> once. With this you have the flexibility you need while also preventing
> a race where an attacker overwrites your crash kernel before you can
> toggle the switch. What do you think?

I actually like this idea :-)

-- Steve

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ