From: Borislav Petkov <bp@alien8.de>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Ingo Molnar <mingo@kernel.org>,
Matt Fleming <matt@codeblueprint.co.uk>,
Stephen Smalley <sds@tycho.nsa.gov>,
"x86@kernel.org" <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Kees Cook <keescook@chromium.org>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Andy Lutomirski <luto@kernel.org>,
Denys Vlasenko <dvlasenk@redhat.com>,
Brian Gerst <brgerst@gmail.com>,
"linux-efi@vger.kernel.org" <linux-efi@vger.kernel.org>
Subject: Re: [PATCH v2] x86/mm: warn on W+x mappings
Date: Wed, 21 Oct 2015 15:24:31 +0200 [thread overview]
Message-ID: <20151021132430.GD3575@pd.tnic> (raw)
In-Reply-To: <CAKv+Gu92iMzCq0zZfTBUVKfXQqDiVfO3WPiHVWNOYtGjTvOkmQ@mail.gmail.com>
On Wed, Oct 21, 2015 at 02:57:47PM +0200, Ard Biesheuvel wrote:
> ... For the remaining cases, which is the vast majority, no such
> assumptions can be made, and since the UEFI runtime regions are
> typically populated with a bunch of PE/COFF images (each of which
> consists of text + data), inferring where the boundaries are between
> them does not seem tractable (for instance, to only map 'boundary'
> pages RWX)
How much of a problem would it be if we still do the on-demand page
faulting and map a trailing piece of code together with the data in a
page RWX?
Still better than mapping the *whole* thing RWX, no?
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
next prev parent reply other threads:[~2015-10-21 13:24 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 [this message]
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
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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