Date: Thu, 5 Nov 2015 23:27:47 +0100
From: Borislav Petkov <bp@alien8.de>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Dave Jones <davej@codemonkey.org.uk>, Ingo Molnar <mingo@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andy Lutomirski <luto@kernel.org>,
        Denys Vlasenko <dvlasenk@redhat.com>
Subject: Re: [GIT PULL] x86/mm changes for v4.4
Message-ID: <20151105222747.GG3579@pd.tnic>
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 <20151105021710.GA22941@codemonkey.org.uk>
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On Thu, Nov 05, 2015 at 02:04:55PM -0800, Linus Torvalds wrote:
> and there's quite a few other pages there that are RW but not marked
> NX. I suspect they come from the EFI runtime services because the

Yeah, at least the EFI mappings would need a bit more fiddling until
they're NX:

https://lkml.kernel.org/r/20151012124113.GD2579@codeblueprint.co.uk

Perhaps we don't even have to make them NX - just set the PGD entry
containing them before the EFI call and unset it after its done.
I.e., something like that.

> pattern seems to match what I see in that area, but there's at least a
> PSE mapping at START_KERNEL_map too, etc.

Maybe we should default n CONFIG_DEBUG_WX until stuff has been fixed...?

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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