On Tue, May 28, 2019 at 06:02:45PM +0100, Catalin Marinas wrote:
> On Thu, May 23, 2019 at 02:31:16PM -0700, Kees Cook wrote:
> > syzkaller already attempts to randomly inject non-canonical and
> > 0x addresses for user pointers in syscalls in an effort to
> > find bugs like
On Thu, May 23, 2019 at 06:43:46PM +0100, Catalin Marinas wrote:
> On Thu, May 23, 2019 at 09:38:19AM -0700, Kees Cook wrote:
> > What on this front would you be comfortable with? Given it's a new
> > feature isn't it sufficient to have a CONFIG (and/or boot option)?
>
> I'd rather avoid
On Thu, May 23, 2019 at 03:44:49PM +0100, Catalin Marinas wrote:
> There is also the obvious requirement which I didn't mention: new user
> space continues to run on new/subsequent kernel versions. That's one of
> the points of contention for this series (ignoring MTE) with the
> maintainers
On Wed, May 22, 2019 at 05:35:27PM +0100, Catalin Marinas wrote:
> The two hard requirements I have for supporting any new hardware feature
> in Linux are (1) a single kernel image binary continues to run on old
> hardware while making use of the new feature if available and (2) old
> user space
On Wed, May 22, 2019 at 08:30:21AM -0700, enh wrote:
> On Wed, May 22, 2019 at 3:11 AM Catalin Marinas
> wrote:
> > On Tue, May 21, 2019 at 05:04:39PM -0700, Kees Cook wrote:
> > > I just want to make sure I fully understand your concern about this
> > > being an ABI break, and I work best with
On Tue, May 21, 2019 at 07:29:33PM +0100, Catalin Marinas wrote:
> On Mon, May 20, 2019 at 04:53:07PM -0700, Evgenii Stepanov wrote:
> > On Fri, May 17, 2019 at 7:49 AM Catalin Marinas
> > wrote:
> > > IMO (RFC for now), I see two ways forward:
> > > [...]
> > > 2. Similar shim to the above libc
=== Overview
arm64 has a feature called Top Byte Ignore, which allows to embed pointer
tags into the top byte of each pointer. Userspace programs (such as
HWASan, a memory debugging tool [1]) might use this feature and pass
tagged user pointers to the kernel through syscalls or other interfaces.
