linux-kernel - Re: [PATCH v2] mm/uffd: UFFD_FEATURE_WP

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: <ZAEccqZfZtw4XtSm@x1n>
Date:   Thu, 2 Mar 2023 17:00:18 -0500
From:   Peter Xu <peterx@...hat.com>
To:     Muhammad Usama Anjum <usama.anjum@...labora.com>
Cc:     David Hildenbrand <david@...hat.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        "kernel@...labora.com" <kernel@...labora.com>
Subject: Re: [PATCH v2] mm/uffd: UFFD_FEATURE_WP_UNPOPULATED

On Thu, Mar 02, 2023 at 08:14:05PM +0500, Muhammad Usama Anjum wrote:
> I've heard about a use case where a file of size 10s of GBs can be mapped
> to the memory and then accessed off and on. We need to handle this
> correctly and efficiently.

Note again that besides any slowness it'll stop working for generic FSs.

One way is we can consider enabling uffd-wp async for all archs, but I need
to think more about it, and it will not be compatible with any other modes.

-- 
Peter Xu