linux-hardening - Re: [PATCH RESEND v2] mm: Optional full ASLR for mmap() and mremap()

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: <CAG48ez3-uvDXL7-WBapEJMHrkXYpnAw=AgbP2evOZgNMFWKy-A@mail.gmail.com>
Date:   Thu, 8 Oct 2020 19:26:31 +0200
From:   Jann Horn <jannh@...gle.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Topi Miettinen <toiwoton@...il.com>,
        linux-hardening@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux-MM <linux-mm@...ck.org>,
        kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND v2] mm: Optional full ASLR for mmap() and mremap()

On Thu, Oct 8, 2020 at 7:23 PM Matthew Wilcox <willy@...radead.org> wrote:
> On Thu, Oct 08, 2020 at 07:13:51PM +0200, Jann Horn wrote:
> > And for expanding stacks, it might be a good idea for other
> > reasons as well (locking consistency) to refactor them such that the
> > size in the VMA tree corresponds to the maximum expansion of the stack
> > (and if an allocation is about to fail, shrink such stack mappings).
>
> We're doing that as part of the B-tree ;-)  Although not the shrink
> stack mappings part ...

Wheee, thanks! Finally no more data races on ->vm_start?