From: Matt Fleming <matt-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
To: Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Borislav Petkov <bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>,
Stephen Smalley <sds-+05T5uksL2qpZYMLLGbcSA@public.gmane.org>,
x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
keescook-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org,
Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
"H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>,
Peter Zijlstra
<a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org>,
Andy Lutomirski <luto-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Denys Vlasenko <dvlasenk-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Brian Gerst <brgerst-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Ard Biesheuvel
<ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Subject: Re: [PATCH v2] x86/mm: warn on W+x mappings
Date: Mon, 12 Oct 2015 13:55:48 +0100 [thread overview]
Message-ID: <20151012125548.GE2579@codeblueprint.co.uk> (raw)
In-Reply-To: <20151012124936.GA6260-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
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.
You can of course disable that by using the "noefi" kernel parameter,
which should unmap everything for you once you've finished booting.
--
Matt Fleming, Intel Open Source Technology Center
next prev parent reply other threads:[~2015-10-12 12:55 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1443814185-21552-1-git-send-email-sds@tycho.nsa.gov>
[not found] ` <20151003112701.GA4531@gmail.com>
[not found] ` <5612CBE8.2010504@tycho.nsa.gov>
[not found] ` <20151006073205.GA11115@gmail.com>
[not found] ` <5613EAD5.2070405@tycho.nsa.gov>
[not found] ` <20151012113605.GB7384@pd.tnic>
[not found] ` <20151012113605.GB7384-fF5Pk5pvG8Y@public.gmane.org>
2015-10-12 12:41 ` [PATCH v2] x86/mm: warn on W+x mappings Matt Fleming
2015-10-12 12:49 ` Ingo Molnar
[not found] ` <20151012124936.GA6260-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-10-12 12:55 ` Matt Fleming [this message]
[not found] ` <20151012125548.GE2579-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
2015-10-12 14:17 ` Ingo Molnar
[not found] ` <20151012141754.GA6621-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-10-12 14:49 ` Matt Fleming
[not found] ` <20151012144928.GF2579-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
2015-10-12 15:34 ` Ard Biesheuvel
[not found] ` <CAKv+Gu95NoB5cPqZMeBLn7i0JWDDPKX63FuiMVD94HpbGhKrhA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-12 15:50 ` Matt Fleming
[not found] ` <20151012155028.GH2579-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
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
[not found] ` <20151014153522.GC8218-fF5Pk5pvG8Y@public.gmane.org>
2015-10-15 10:10 ` Matt Fleming
[not found] ` <20151015101016.GB2975-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
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
[not found] ` <20151021094242.GA12155-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-10-21 12:49 ` Ingo Molnar
[not found] ` <20151021124924.GA19262-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-10-21 12:57 ` Ard Biesheuvel
2015-10-21 13:24 ` Borislav Petkov
[not found] ` <20151021132430.GD3575-fF5Pk5pvG8Y@public.gmane.org>
2015-10-21 13:28 ` Ard Biesheuvel
2015-10-21 14:36 ` Borislav Petkov
[not found] ` <20151021143651.GE3575-fF5Pk5pvG8Y@public.gmane.org>
2015-10-21 18:46 ` Andy Lutomirski
[not found] ` <CALCETrWwHLnt6=MiyuQY48zEaOUMuFTg1oN3NDdEOxa6XYMgCw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-21 20:45 ` Matt Fleming
[not found] ` <20151021204522.GB20338-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
2015-10-21 20:49 ` Andy Lutomirski
2015-10-21 20:38 ` Matt Fleming
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