linux-kernel - Re: [PATCH] mm: Track page table modifications in __apply_to_page

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200821121816.GJ3354@suse.de>
Date:   Fri, 21 Aug 2020 14:18:16 +0200
From:   Joerg Roedel <jroedel@...e.de>
To:     Chris Wilson <chris@...is-wilson.co.uk>
Cc:     linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
        linux-mm@...ck.org, Pavel Machek <pavel@....cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Dave Airlie <airlied@...hat.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Vrabel <david.vrabel@...rix.com>, stable@...r.kernel.org
Subject: Re: [PATCH] mm: Track page table modifications in
 __apply_to_page_range() construction

On Fri, Aug 21, 2020 at 12:38:03PM +0100, Chris Wilson wrote:
> In the version I tested, I also had
> 
> @@ -2216,7 +2216,7 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,
> 
>         if (create) {
>                 pte = (mm == &init_mm) ?
> -                       pte_alloc_kernel(pmd, addr) :
> +                       pte_alloc_kernel_track(pmd, addr, mask) :
>                         pte_alloc_map_lock(mm, pmd, addr, &ptl);
>                 if (!pte)
>                         return -ENOMEM;
> 
> And that PGTBL_PMD_MODIFIED makes a difference.

Right, thanks. Added that too.