[POWERPC] Mask 32-bit system call arguments to 32 bits on PPC64 in au…

…dit code

The system call entry code will clear the high bits of argument
registers before invoking the system call; don't report whatever noise
happens to be in the high bits of the register before that happens.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/ptrace.c

@@ -532,16 +532,22 @@ void do_syscall_trace_enter(struct pt_regs *regs)
 	    && (current->ptrace & PT_PTRACED))
 		do_syscall_trace();
 
-	if (unlikely(current->audit_context))
-		audit_syscall_entry(
-#ifdef CONFIG_PPC32
-				    AUDIT_ARCH_PPC,
-#else
-				    test_thread_flag(TIF_32BIT)?AUDIT_ARCH_PPC:AUDIT_ARCH_PPC64,
+	if (unlikely(current->audit_context)) {
+#ifdef CONFIG_PPC64
+		if (!test_thread_flag(TIF_32BIT))
+			audit_syscall_entry(AUDIT_ARCH_PPC64,
+					    regs->gpr[0],
+					    regs->gpr[3], regs->gpr[4],
+					    regs->gpr[5], regs->gpr[6]);
+		else
 #endif
-				    regs->gpr[0],
-				    regs->gpr[3], regs->gpr[4],
-				    regs->gpr[5], regs->gpr[6]);
+			audit_syscall_entry(AUDIT_ARCH_PPC,
+					    regs->gpr[0],
+					    regs->gpr[3] & 0xffffffff,
+					    regs->gpr[4] & 0xffffffff,
+					    regs->gpr[5] & 0xffffffff,
+					    regs->gpr[6] & 0xffffffff);
+	}
 }
 
 void do_syscall_trace_leave(struct pt_regs *regs)