From: Josh Triplett <josh@joshtriplett.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>,
Borislav Petkov <bp@alien8.de>,
Stephen Smalley <sds@tycho.nsa.gov>,
x86@kernel.org, linux-kernel@vger.kernel.org,
keescook@chromium.org, Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [PATCH v2] x86/mm: warn on W+x mappings
Date: Mon, 12 Oct 2015 07:56:59 -0700 [thread overview]
Message-ID: <20151012145539.GA25937@x> (raw)
In-Reply-To: <20151012141754.GA6621@gmail.com>
On Mon, Oct 12, 2015 at 04:17:54PM +0200, Ingo Molnar wrote:
> * Matt Fleming <matt@codeblueprint.co.uk> wrote:
> > On Mon, 12 Oct, at 02:49:36PM, Ingo Molnar wrote:
> > > So why not unmap them after bootup? Is there any reason to call into EFI code
> > > while the system is up and running?
> >
> > That's where the runtime services code lives. So if you want things like EFI
> > variables (used by the distro installer, among other things) you need to map the
> > runtime regions.
>
> So EFI variables could be queried during bootup and saved on the Linux side.
That wouldn't support writing to EFI variables. Or using the EFI
capsule update system to update firmware.
- Josh Triplett
next prev parent reply other threads:[~2015-10-12 14:57 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-02 19:29 [PATCH v2] x86/mm: warn on W+x mappings Stephen Smalley
2015-10-02 20:44 ` Kees Cook
2015-10-03 11:27 ` Ingo Molnar
2015-10-05 19:13 ` Stephen Smalley
2015-10-06 7:32 ` Ingo Molnar
2015-10-06 15:37 ` Stephen Smalley
2015-10-12 11:36 ` Borislav Petkov
2015-10-12 12:41 ` Matt Fleming
2015-10-12 12:49 ` Ingo Molnar
2015-10-12 12:55 ` Matt Fleming
2015-10-12 14:17 ` Ingo Molnar
2015-10-12 14:49 ` Matt Fleming
2015-10-12 15:34 ` Ard Biesheuvel
2015-10-12 15:50 ` Matt Fleming
2015-10-12 16:43 ` Ard Biesheuvel
2015-10-14 15:18 ` Ingo Molnar
2015-10-14 15:30 ` Andy Lutomirski
2015-10-14 15:35 ` Borislav Petkov
2015-10-15 10:10 ` Matt Fleming
2015-10-15 10:33 ` Borislav Petkov
2015-10-16 1:45 ` Ricardo Neri
2015-10-14 21:02 ` Matt Fleming
2015-10-21 9:42 ` Ingo Molnar
2015-10-21 12:49 ` Ingo Molnar
2015-10-21 12:57 ` Ard Biesheuvel
2015-10-21 13:24 ` Borislav Petkov
2015-10-21 13:28 ` Ard Biesheuvel
2015-10-21 14:36 ` Borislav Petkov
2015-10-21 18:46 ` Andy Lutomirski
2015-10-21 20:45 ` Matt Fleming
2015-10-21 20:49 ` Andy Lutomirski
2015-10-21 20:38 ` Matt Fleming
2015-10-12 14:56 ` Josh Triplett [this message]
2015-10-14 15:19 ` Ingo Molnar
2015-10-14 16:47 ` Josh Triplett
2015-10-21 9:43 ` Ingo Molnar
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