From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:59606 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727358AbeIJMJI (ORCPT ); Mon, 10 Sep 2018 08:09:08 -0400 Date: Mon, 10 Sep 2018 09:16:29 +0200 From: Greg Kroah-Hartman To: Guenter Roeck Cc: Ben Hutchings , David Woodhouse , Michal Hocko , stable@vger.kernel.org, Andi Kleen , Thomas Gleixner , LKML Subject: Re: [PATCH 4.4 41/43] x86/mm/pat: Make set_memory_np() L1TF safe Message-ID: <20180910071629.GA21671@kroah.com> References: <20180814171517.014285600@linuxfoundation.org> <20180814171519.769320295@linuxfoundation.org> <1536511561.3024.115.camel@codethink.co.uk> <5438e0f8-f5e0-99ef-fbdd-b5f4a079f254@roeck-us.net> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <5438e0f8-f5e0-99ef-fbdd-b5f4a079f254@roeck-us.net> Sender: stable-owner@vger.kernel.org List-ID: On Sun, Sep 09, 2018 at 10:06:06AM -0700, Guenter Roeck wrote: > On 09/09/2018 09:46 AM, Ben Hutchings wrote: > > On Tue, 2018-08-14 at 19:18 +0200, Greg Kroah-Hartman wrote: > > > 4.4-stable review patch.��If anyone has any objections, please let me know. > > > > > > ------------------ > > > > > > From: Andi Kleen > > > > > > commit 958f79b9ee55dfaf00c8106ed1c22a2919e0028b upstream > > [...] > > > --- a/arch/x86/include/asm/pgtable.h > > > +++ b/arch/x86/include/asm/pgtable.h > > > @@ -378,12 +378,39 @@ static inline pmd_t pfn_pmd(unsigned lon > > > > � return __pmd(pfn | massage_pgprot(pgprot)); > > > �} > > > +static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot) > > > +{ > > > + phys_addr_t pfn = page_nr << PAGE_SHIFT; > > > + pfn ^= protnone_mask(pgprot_val(pgprot)); > > > + pfn &= PHYSICAL_PUD_PAGE_MASK; > > > + return __pud(pfn | massage_pgprot(pgprot)); > > > +} > > [...] > > > > This (and the backport to 4.9) are missing the fix from commit > > e14d7dfb41f5 "x86/speculation/l1tf: Fix up pte->pfn conversion for > > PAE", as that was applied earlier in the series.��But since PAE implies > > only 3-level paging I don't know how the PUD functions get used or > > whether this actually matters. > > > Excellent find. > > e14d7dfb41f5 (re-)applies cleanly to both 4.4.y and 4.9.y. Since most of its > changes are already applied, the only remaining change is > > diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h > index c535012bdb56..5736306bdaab 100644 > --- a/arch/x86/include/asm/pgtable.h > +++ b/arch/x86/include/asm/pgtable.h > @@ -420,7 +420,7 @@ static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot) > > static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot) > { > - phys_addr_t pfn = page_nr << PAGE_SHIFT; > + phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT; > pfn ^= protnone_mask(pgprot_val(pgprot)); > pfn &= PHYSICAL_PUD_PAGE_MASK; > return __pud(pfn | massage_pgprot(pgprot)); > > after cherry-picking it into both branches. > > I think we should re-apply it to both 4.4.y and 4.9.y be on the safe side. Thanks for finding and figuring out the fix. Now queued up to both trees. greg k-h