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x86/fpu/xstate: Clear xstate header in copy_xstate_to_uabi_buf() again

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The change which made copy_xstate_to_uabi_buf() usable for
[x]fpregs_get() removed the zeroing of the header which means the
header, which is copied to user space later, contains except for the
xfeatures member, random stack content.

Add the memset() back to zero it before usage.

Fixes: eb6f51723f ("x86/fpu: Make copy_xstate_to_kernel() usable for [x]fpregs_get()")
Reported-by: kernel test robot <oliver.sang@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/875yy3wb8h.ffs@nanos.tec.linutronix.de
This commit is contained in:
Thomas Gleixner 2021-06-24 17:09:18 +02:00 committed by Borislav Petkov
parent 6f9866a166
commit 93c2cdc975
1 changed files with 1 additions and 0 deletions
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arch/x86/kernel/fpu/xstate.c
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@ -982,6 +982,7 @@ void copy_xstate_to_uabi_buf(struct membuf to, struct task_struct *tsk,
unsigned int zerofrom;
int i;
memset(&header, 0, sizeof(header));
header.xfeatures = xsave->header.xfeatures;
/* Mask out the feature bits depending on copy mode */