Re: [PATCH] x86/fpu/xstate: Clear uninitialized xstate areas in core dump

[Yu-cheng Yu]

On Thu, 2020-05-07 at 09:52 -0700, Dave Hansen wrote:
> On 5/7/20 9:49 AM, Yu-cheng Yu wrote:
> > In a core dump, copy_xstate_to_kernel() copies only enabled user xfeatures
> > to a kernel buffer without touching areas for disabled xfeatures.  However,
> > those uninitialized areas may contain random data, which is then written to
> > the core dump file and can be read by a non-privileged user.
> > 
> > Fix it by clearing uninitialized areas.
> 
> Do you have a Fixes: tag for this, or some background on where this
> issue originated that might be helpful for backports?

I will add that.