[patch V4 59/65] x86/fpu/signal: Remove the legacy alignment check

[Thomas Gleixner]

Checking for the XSTATE buffer being 64 byte aligned and if not deciding
just to restore the FXSR state is daft.

If user space provides an unaligned math frame and has the extended state
magic set in the FX software reserved bytes, then it really can keep the
pieces.

If the frame is unaligned and the FX software magic is not set, then
fx_only is already set and the restore will use fxrstor.

Remove it.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Borislav Petkov <bp@xxxxxxx>
---
 arch/x86/kernel/fpu/signal.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -306,9 +306,6 @@ static int __fpu_restore_sig(void __user
 		}
 	}
 
-	if ((unsigned long)buf_fx % 64)
-		fx_only = 1;
-
 	if (!ia32_fxstate) {
 		/*
 		 * Attempt to restore the FPU registers directly from user