Re: 2.2.0p6: ptrace problem?!

Pete Harlan (harlan@pointofchoice.com)
Sun, 10 Jan 1999 19:03:31 -0600 (CST)

> Used gdb to attach to a running process under 2.2.0p6. And promptly
> received 1000 lines of klog junk, most like
>
> Jan 9 21:23:23 localhost kernel: Process: ipop3d (stack=c14abe80,
> task=c14aa000)
> Jan 9 21:23:23 localhost kernel: [<c014e371>] [<c015b352>] [<c013f55e>]

IANAKH, but there's some debugging code in ptrace.c. You can turn it
off with the attached patch (mailed yesterday to Linus). The messages
show up when doing a normal strace, too.

--
Pete Harlan
harlan@pointofchoice.com


--- linux.orig/arch/i386/kernel/ptrace.c	Sat Jan  9 12:12:51 1999
+++ linux/arch/i386/kernel/ptrace.c	Sun Jan 10 05:03:25 1999
@@ -67,6 +67,7 @@
 	return 0;
 }
 
+#ifdef DEBUG_PTRACE
 extern int _stext, _etext;
 static void print_child_state(struct task_struct *task)
 {
@@ -93,6 +94,7 @@
 	}	
 	printk("\n");
 }
+#endif
 
 /*
  * This routine gets a long from any process space by following the page
@@ -400,7 +402,9 @@
 	read_unlock(&tasklist_lock);	/* FIXME!!! */
 	if (!child)
 		goto out;
-print_child_state(child);
+#ifdef DEBUG_PTRACE
+	print_child_state(child);
+#endif
 	ret = -EPERM;
 	if (pid == 1)		/* you may not mess with init */
 		goto out;


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