linux-kernel - Re: [git pull] vfs pile 1 (splice)

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] [day] [month] [year] [list]

Date:   Wed, 12 Oct 2016 09:10:58 -0500 (CDT)
From:   Christoph Lameter <cl@...ux.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
cc:     Al Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jens Axboe <axboe@...com>, Ted Ts'o <tytso@....edu>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [git pull] vfs pile 1 (splice)

On Mon, 10 Oct 2016, Linus Torvalds wrote:

> But the fact that it reacts _so_ badly to double-freeing issues when
> the freelist has become corrupted due to an object being free'd and
> then modified is clearly very fragile and not great.

Yup that is why the debug options move the freepointer after the object
and verify that the pointers in the chain point to valid objects in the
slab page. slub_debug has special logic to detect double freeing and that
option can be enabled separatelhy.