From: Geert Uytterhoeven <geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org>
To: Matthew Garrett
<matthew.garrett-05XSO3Yj/JvQT0dZR+AlfA@public.gmane.org>
Cc: "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Josh Boyer <jwboyer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Kees Cook <keescook-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
Subject: Re: [PATCH 08/10] kexec: Disable at runtime if the kernel enforces module loading restrictions
Date: Sun, 1 Sep 2013 10:52:45 +0200 [thread overview]
Message-ID: <CAMuHMdVPAEQn8wmNnagPpy45OSSzvjX-LUDx8G8eWiOFh=4sSw@mail.gmail.com> (raw)
In-Reply-To: <1376928619-3775-8-git-send-email-matthew.garrett-05XSO3Yj/JvQT0dZR+AlfA@public.gmane.org>
On Mon, Aug 19, 2013 at 6:10 PM, Matthew Garrett
<matthew.garrett-05XSO3Yj/JvQT0dZR+AlfA@public.gmane.org> wrote:
> kexec permits the loading and execution of arbitrary code in ring 0, which
> is something that module signing enforcement is meant to prevent. It makes
> sense to disable kexec in this situation.
Any plans for signed kexec code?
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
next prev parent reply other threads:[~2013-09-01 8:52 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-19 16:10 [PATCH 01/10] Add secure_modules() call Matthew Garrett
2013-08-19 16:10 ` [PATCH 02/10] PCI: Lock down BAR access when module security is enabled Matthew Garrett
[not found] ` <1376928619-3775-1-git-send-email-matthew.garrett-05XSO3Yj/JvQT0dZR+AlfA@public.gmane.org>
2013-08-19 16:10 ` [PATCH 03/10] x86: Lock down IO port " Matthew Garrett
2013-08-19 16:10 ` [PATCH 04/10] ACPI: Limit access to custom_method Matthew Garrett
[not found] ` <1376928619-3775-4-git-send-email-matthew.garrett-05XSO3Yj/JvQT0dZR+AlfA@public.gmane.org>
2013-08-29 17:58 ` Lenny Szubowicz
2013-08-19 16:10 ` [PATCH 10/10] Add option to automatically enforce module signatures when in Secure Boot mode Matthew Garrett
2013-08-19 16:10 ` [PATCH 05/10] asus-wmi: Restrict debugfs interface when module loading is restricted Matthew Garrett
[not found] ` <1376928619-3775-5-git-send-email-matthew.garrett-05XSO3Yj/JvQT0dZR+AlfA@public.gmane.org>
2013-08-19 16:20 ` Kees Cook
[not found] ` <CAGXu5jJtvVx76ZZrk+s4KwopT-ocZcMbwWNM1ELxH4crm=QGLw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-08-19 17:15 ` Matthew Garrett
2013-08-29 18:22 ` H. Peter Anvin
2013-08-29 18:35 ` Matthew Garrett
2013-08-29 18:46 ` H. Peter Anvin
[not found] ` <521F9708.6040902-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2013-08-29 18:49 ` Matthew Garrett
2013-08-29 19:05 ` H. Peter Anvin
[not found] ` <521F9B8B.6090300-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2013-08-29 19:07 ` Matthew Garrett
2013-08-29 19:28 ` Josh Boyer
2013-08-19 16:10 ` [PATCH 06/10] Restrict /dev/mem and /dev/kmem " Matthew Garrett
2013-08-19 16:10 ` [PATCH 07/10] acpi: Ignore acpi_rsdp kernel parameter " Matthew Garrett
2013-08-19 16:10 ` [PATCH 08/10] kexec: Disable at runtime if the kernel enforces module loading restrictions Matthew Garrett
[not found] ` <1376928619-3775-8-git-send-email-matthew.garrett-05XSO3Yj/JvQT0dZR+AlfA@public.gmane.org>
2013-09-01 8:52 ` Geert Uytterhoeven [this message]
2013-08-19 16:10 ` [PATCH 09/10] x86: Restrict MSR access when module loading is restricted Matthew Garrett
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