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

[Dave Hansen]

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?