linux-kernel - Re: [PATCH] mm: remove offset check on page->compound

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:   Fri, 7 Jan 2022 13:40:59 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Wei Yang <richard.weiyang@...il.com>, peterz@...radead.org,
        akpm@...ux-foundation.org, vbabka@...e.cz, will@...nel.org,
        linyunsheng@...wei.com, aarcange@...hat.com, feng.tang@...el.com,
        ebiederm@...ssion.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: remove offset check on page->compound_head and
 folio->lru

On Fri, Jan 07, 2022 at 03:59:01AM +0000, Matthew Wilcox wrote:
>On Thu, Jan 06, 2022 at 11:52:54PM +0000, Wei Yang wrote:
>> FOLIO_MATCH() is used to make sure struct page and folio has identical
>> layout for the first several words.
>> 
>> The comparison of offset between page->compound_head and folio->lru is
>> more like an internal check in struct page.
>> 
>> This patch just removes it.
>> 
>> Signed-off-by: Wei Yang <richard.weiyang@...il.com>
>
>No.

Hi, Matthew

Would you mind sharing some insight on this check?

-- 
Wei Yang
Help you, Help me