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| author | Yu-cheng Yu <yu-cheng.yu@intel.com> | 2016-07-11 18:18:56 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-07-11 16:44:00 +0200 |
| commit | 35ac2d7ba787eb4b7418a5a6f5919c25e10a780a (patch) | |
| tree | 735223525166e0cdaf3451d0c401adf4267a8435 /drivers/nfc | |
| parent | x86/fpu/xstate: Return NULL for disabled xstate component address (diff) | |
| download | linux-35ac2d7ba787eb4b7418a5a6f5919c25e10a780a.tar.xz linux-35ac2d7ba787eb4b7418a5a6f5919c25e10a780a.zip | |
x86/fpu/xstate: Fix fpstate_init() for XRSTORS
In XSAVES mode if fpstate_init() is used to initialize a
task's extended state area, xsave.header.xcomp_bv[63] must
be set. Otherwise, when the task is scheduled, a warning is
triggered from copy_kernel_to_xregs().
One such test case is: setting an invalid extended state
through PTRACE. When xstateregs_set() rejects the syscall
and re-initializes the task's extended state area. This triggers
the warning mentioned above.
Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Reviewed-by: Dave Hansen <dave.hansen@intel.com>
Cc: H. Peter Anvin <h.peter.anvin@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi V Shankar <ravi.v.shankar@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1468253937-40008-4-git-send-email-fenghua.yu@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/nfc')
0 files changed, 0 insertions, 0 deletions