linux-kernel - Re: [PATCH v3] mm/page_alloc: fix counting of free pages after take off from buddy

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]

Date:   Wed, 26 May 2021 12:43:15 +0200
From:   Oscar Salvador <osalvador@...e.de>
To:     David Hildenbrand <david@...hat.com>
Cc:     Ding Hui <dinghui@...gfor.com.cn>, akpm@...ux-foundation.org,
        naoya.horiguchi@....com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH v3] mm/page_alloc: fix counting of free pages after take
 off from buddy

On Wed, May 26, 2021 at 09:58:15AM +0200, David Hildenbrand wrote:
> I guess if we'd actually be removing a page from the buddy while it's
> currently isolated by someone else (i.e., alloc_contig_range()), we might be
> in bigger trouble.
> 
> I think we should actually skip isolated pages completely.
> take_page_off_buddy() should not touch them.

That might be a problem indeed.
I will have a look at it.

Thanks

-- 
Oscar Salvador
SUSE L3