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x86/fpu/xstate: Warn when checking alignment of disabled xfeatures 

An XSAVES component's alignment/offset is meaningful only when the
feature is enabled. Return zero and WARN_ONCE on checking alignment of
disabled features.

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lkml.kernel.org/r/20200109211452.27369-4-yu-cheng.yu@intel.com
This commit is contained in:
Yu-cheng Yu 2020-01-09 13:14:52 -08:00 committed by Borislav Petkov
parent 49a91d61ae
commit e70b100806
1 changed files with 7 additions and 0 deletions
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7
arch/x86/kernel/fpu/xstate.c
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@ -325,6 +325,13 @@ static int xfeature_is_aligned(int xfeature_nr)
u32 eax, ebx, ecx, edx;
CHECK_XFEATURE(xfeature_nr);
if (!xfeature_enabled(xfeature_nr)) {
WARN_ONCE(1, "Checking alignment of disabled xfeature %d\n",
xfeature_nr);
return 0;
}
cpuid_count(XSTATE_CPUID, xfeature_nr, &eax, &ebx, &ecx, &edx);
/*
* The value returned by ECX[1] indicates the alignment