summaryrefslogtreecommitdiff
path: root/arch/x86/kernel/fpu/signal.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/kernel/fpu/signal.c')
-rw-r--r--arch/x86/kernel/fpu/signal.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c
index 445c57c9c539..831b25c5e705 100644
--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -379,9 +379,14 @@ static int __fpu_restore_sig(void __user *buf, void __user *buf_fx,
sizeof(fpu->state.fxsave)))
return -EFAULT;
- /* Reject invalid MXCSR values. */
- if (fpu->state.fxsave.mxcsr & ~mxcsr_feature_mask)
- return -EINVAL;
+ if (IS_ENABLED(CONFIG_X86_64)) {
+ /* Reject invalid MXCSR values. */
+ if (fpu->state.fxsave.mxcsr & ~mxcsr_feature_mask)
+ return -EINVAL;
+ } else {
+ /* Mask invalid bits out for historical reasons (broken hardware). */
+ fpu->state.fxsave.mxcsr &= mxcsr_feature_mask;
+ }
/* Enforce XFEATURE_MASK_FPSSE when XSAVE is enabled */
if (use_xsave())