On Fri, Jan 26, 2018 at 05:23:31PM +0100, Andrea Arcangeli wrote: > Hello, > > On Sun, Jan 07, 2018 at 10:48:00PM +0100, Thomas Gleixner wrote: > > +static DEVICE_ATTR(meltdown, 0444, cpu_show_meltdown, NULL); > > +static DEVICE_ATTR(spectre_v1, 0444, cpu_show_spectre_v1, NULL); > > +static DEVICE_ATTR(spectre_v2, 0444, cpu_show_spectre_v2, NULL); > > This sysfs feature implemented as above is weakening kernel security, > it should be 0400 above.
See the patch from Jason A. Donenfeld <[email protected]> to do just that: Subject: [PATCH] cpu: do not leak vulnerabilities to unprivileged users Message-Id: <[email protected]> I'll be queueing it up for 4.16-rc1 and backport it everywhere. thanks, greg k-h
