linux-kernel - Re: [PATCH v5 1/2] mm,hwpoison: fix race with hugetlb page allocation

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: <20210525073559.GA844@linux>
Date:   Tue, 25 May 2021 09:36:05 +0200
From:   Oscar Salvador <osalvador@...e.de>
To:     HORIGUCHI NAOYA(堀口　直也) 
        <naoya.horiguchi@....com>
Cc:     Mike Kravetz <mike.kravetz@...cle.com>,
        Naoya Horiguchi <nao.horiguchi@...il.com>,
        Muchun Song <songmuchun@...edance.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Tony Luck <tony.luck@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 1/2] mm,hwpoison: fix race with hugetlb page allocation

On Thu, May 20, 2021 at 07:17:17AM +0000, HORIGUCHI NAOYA(堀口 直也) wrote:
> So I think of inserting the check to comply with the assumption of
> get_hwpoison_huge_page() like below:
> 
>         ret = get_hwpoison_huge_page(head, &hugetlb);
>         if (hugetlb)
>                 return ret;
> 
>         if (!PageLRU(head) && !__PageMovable(head))
>                 return 0;
> 
>         if (PageTransHuge(head)) {
>                 ...
>         }
> 
>         if (get_page_unless_zero(head)) {
>                 ...
>         }
> 
>         return 0;

Hi Naoya,

would you mind posting a complete draft of what it would look like?
I am having a hard time picturing it.


Thanks

-- 
Oscar Salvador
SUSE L3