userns: On ppc convert current_uid from a kuid before printing.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

arch/powerpc/mm/fault.c

@@ -470,7 +470,7 @@ int __kprobes do_page_fault(struct pt_regs *regs, unsigned long address,
 	if (is_exec && (error_code & DSISR_PROTFAULT))
 		printk_ratelimited(KERN_CRIT "kernel tried to execute NX-protected"
 				   " page (%lx) - exploit attempt? (uid: %d)\n",
-				   address, current_uid());
+				   address, from_kuid(&init_user_ns, current_uid()));
 
 	return SIGSEGV;