linux-kernel - Re: [PATCHv5 05/19] mm/page_alloc: Handle allocation for encrypted memory

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 for Android: free password hash cracker in your pocket

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

Message-ID: <b0a92a2f-cf14-c976-9fbd-fd9aa4ebcf96@intel.com>
Date:   Thu, 19 Jul 2018 07:05:36 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Kirill A. Shutemov" <kirill@...temov.name>,
        Michal Hocko <mhocko@...e.com>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Kai Huang <kai.huang@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCHv5 05/19] mm/page_alloc: Handle allocation for encrypted
 memory

On 07/19/2018 01:27 AM, Kirill A. Shutemov wrote:
>> What other code might need prep_encrypted_page()?
> 
> Custom pages allocators if these pages can end up in encrypted VMAs.
> 
> It this case compaction creates own pool of pages to be used for
> allocation during page migration.

OK, that makes sense.  It also sounds like some great information to add
near prep_encrypted_page().

Do we have any ability to catch cases like this if we get them wrong, or
will we just silently corrupt data?