| Date | Tue, 22 Jun 2021 19:01:12 +0200 | From | Borislav Petkov <> | Subject | Re: [patch V3 53/66] x86/fpu: Hook up PKRU into ptrace() |
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On Fri, Jun 18, 2021 at 04:19:16PM +0200, Thomas Gleixner wrote: > From: Dave Hansen <dave.hansen@linux.intel.com> > > One nice thing about having PKRU be XSAVE-managed is that it gets naturally > exposed into the XSAVE-using ABIs. Now that XSAVE will not be used to > manage PKRU, these ABIs need to be manually enabled to deal with PKRU. > > ptrace() uses copy_uabi_xstate_to_kernel() to collect the tracee's > XSTATE. As PKRU is not in the task's XSTATE buffer, use task->thread.pkru > for filling in up the ptrace buffer. > > Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> > Signed-off-by: Thomas Gleixner <tglx@linutronix.de> > --- > arch/x86/include/asm/fpu/xstate.h | 2 +- > arch/x86/kernel/fpu/regset.c | 10 ++++------ > arch/x86/kernel/fpu/xstate.c | 25 ++++++++++++++++++------- > 3 files changed, 23 insertions(+), 14 deletions(-)
Reviewed-by: Borislav Petkov <bp@suse.de>
-- Regards/Gruss, Boris.
SUSE Software Solutions Germany GmbH, GF: Felix Imendörffer, HRB 36809, AG Nürnberg
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