From: Dave Hansen <dave.hansen@linux.intel.com>
To: Andy Lutomirski <luto@kernel.org>
Cc: Nadav Amit <namit@vmware.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"aarcange@redhat.com" <aarcange@redhat.com>,
"torvalds@linux-foundation.org" <torvalds@linux-foundation.org>,
"keescook@google.com" <keescook@google.com>,
"hughd@google.com" <hughd@google.com>,
"jgross@suse.com" <jgross@suse.com>,
"x86@kernel.org" <x86@kernel.org>
Subject: Re: [RFC][PATCH 04/10] x86/espfix: use kernel-default PTE mask
Date: Thu, 22 Feb 2018 14:05:19 -0800 [thread overview]
Message-ID: <8fca2faa-1bac-2252-3719-8d393e2f2661@linux.intel.com> (raw)
In-Reply-To: <CALCETrU_o5Mk5YTdN0_+2QGfEV5rQ7-MJC7_7dyjHhq+CdD3Uw@mail.gmail.com>
On 02/22/2018 01:59 PM, Andy Lutomirski wrote:
>> I think it's good practice to just expose only the *minimal* amount of
>> data necessary. It's easier to audit and less likely to expose things
>> accidentall.
> But espfix64 is geniunely global. I'm confused.
I'm the confused one.
In my *first* set of patches to do this, I missed making the espfix64
area global. This new code apparently got it right, but I assumed the
"new" global area that showed up was a mistake, thus this patch.
I'll change this patch into a commenting patch that calls out the need
for keeping _PAGE_GLOBAL.
next prev parent reply other threads:[~2018-02-22 22:05 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-22 20:36 [RFC][PATCH 00/10] Use global pages with PTI Dave Hansen
2018-02-22 20:36 ` [RFC][PATCH 01/10] x86/mm: factor out pageattr _PAGE_GLOBAL setting Dave Hansen
2018-02-22 20:36 ` [RFC][PATCH 02/10] x86/mm: undo double _PAGE_PSE clearing Dave Hansen
2018-02-22 20:36 ` [RFC][PATCH 03/10] x86/mm: introduce "default" kernel PTE mask Dave Hansen
2018-02-22 22:21 ` Nadav Amit
2018-02-22 22:26 ` Dave Hansen
2018-02-22 23:11 ` Tom Lendacky
2018-02-23 23:46 ` Dave Hansen
2018-02-22 20:36 ` [RFC][PATCH 04/10] x86/espfix: use kernel-default " Dave Hansen
2018-02-22 21:27 ` Nadav Amit
2018-02-22 21:30 ` Dave Hansen
2018-02-22 21:59 ` Andy Lutomirski
2018-02-22 22:05 ` Dave Hansen [this message]
2018-02-22 20:37 ` [RFC][PATCH 05/10] x86/mm: do not auto-massage page protections Dave Hansen
2018-02-22 21:46 ` Nadav Amit
2018-02-22 21:52 ` Dave Hansen
2018-02-22 20:37 ` [RFC][PATCH 06/10] x86/mm: remove extra filtering in pageattr code Dave Hansen
2018-02-22 20:37 ` [RFC][PATCH 07/10] x86/mm: comment _PAGE_GLOBAL mystery Dave Hansen
2018-02-22 20:37 ` [RFC][PATCH 08/10] x86/mm: do not forbid _PAGE_RW before init for __ro_after_init Dave Hansen
2018-02-22 20:53 ` Kees Cook
2018-02-22 20:37 ` [RFC][PATCH 09/10] x86/pti: enable global pages for shared areas Dave Hansen
2018-02-22 20:37 ` [RFC][PATCH 10/10] x86/pti: clear _PAGE_GLOBAL for kernel image Dave Hansen
2018-02-22 21:52 ` [RFC][PATCH 00/10] Use global pages with PTI Linus Torvalds
2018-02-24 1:49 ` Dave Hansen
2018-02-24 4:20 ` Linus Torvalds
2018-02-24 4:34 ` [RFC][PATCH 00/10] Use global pages with PTI - Truth about the white man thetruthbeforeus
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