linux-kernel - Re: [PATCH] mm: check pfn_valid first in zero_resv

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: <20171201091930.5ddygjl23owfovrz@dhcp22.suse.cz>
Date:   Fri, 1 Dec 2017 10:19:30 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Dave Young <dyoung@...hat.com>
Cc:     linux-kernel@...r.kernel.org, pasha.tatashin@...cle.com,
        linux-mm@...ck.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] mm: check pfn_valid first in zero_resv_unavail

On Fri 01-12-17 16:56:57, Dave Young wrote:
> On 11/30/17 at 10:35am, Michal Hocko wrote:
[...]
> > Can we exclude that range from the memblock allocator instead? E.g. what
> > happens if somebody allocates from that range?
> 
> It is a EFI BGRT image buffer provided by firmware, they are reserved
> always and can not be used to allocate memory.

Hmm, I see but I was actually suggesting to remove this range from the
memblock allocator altogether (memblock_remove) as it shouldn't be there
in the first place.
-- 
Michal Hocko
SUSE Labs