linux-kernel - Re: [PATCH 6/6] drivers/IB,core: reduce scope of mmap

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:   Mon, 21 Jan 2019 21:53:24 +0000
From:   Christopher Lameter <cl@...ux.com>
To:     Davidlohr Bueso <dave@...olabs.net>
cc:     akpm@...ux-foundation.org, dledford@...hat.com, jgg@...lanox.com,
        jack@...e.de, ira.weiny@...el.com, linux-rdma@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Davidlohr Bueso <dbueso@...e.de>
Subject: Re: [PATCH 6/6] drivers/IB,core: reduce scope of mmap_sem

On Mon, 21 Jan 2019, Davidlohr Bueso wrote:

> ib_umem_get() uses gup_longterm() and relies on the lock to
> stabilze the vma_list, so we cannot really get rid of mmap_sem
> altogether, but now that the counter is atomic, we can get of
> some complexity that mmap_sem brings with only pinned_vm.

Reviewd-by: Christoph Lameter <cl@...ux.com>