x86/fpu: Emulate XRSTOR's behavior if the xfeatures PKRU bit is not set

commit d7e5ace upstream

The hardware XRSTOR instruction resets the PKRU register to its hardware
init value (namely 0) if the PKRU bit is not set in the xfeatures mask.
Emulating that here restores the pre-5.14 behavior for PTRACE_SET_REGSET
with NT_X86_XSTATE, and makes sigreturn (which still uses XRSTOR) and
behave identically.

Fixes: e84ba47 ("x86/fpu: Hook up PKRU into ptrace()")
Signed-off-by: Kyle Huey <me@kylehuey.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/all/20221115230932.7126-6-khuey%40kylehuey.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: khuey

arch/x86/kernel/fpu/xstate.c

@@ -1168,7 +1168,8 @@ static int copy_uabi_to_xstate(struct xregs_state *xsave, const void *kbuf,
 
 		xpkru = __raw_xsave_addr(xsave, XFEATURE_PKRU);
 		*pkru = xpkru->pkru;
-	}
+	} else
+		*pkru = 0;
 
 	/*
 	 * The state that came in from userspace was user-state only.