Description: try to make the PTRACE scope sysctl more discoverable via a
 verbose error message when failures happen.
Author: Kees Cook <kees@ubuntu.com>

Index: gdb-7.1/gdb/inf-ptrace.c
===================================================================
--- gdb-7.1.orig/gdb/inf-ptrace.c	2010-06-08 15:47:16.238390895 -0700
+++ gdb-7.1/gdb/inf-ptrace.c	2010-06-08 17:29:39.445890685 -0700
@@ -212,7 +212,16 @@
   errno = 0;
   ptrace (PT_ATTACH, pid, (PTRACE_TYPE_ARG3)0, 0);
   if (errno != 0)
-    perror_with_name (("ptrace"));
+    {
+      if (errno == EPERM)
+        {
+	      fprintf_unfiltered (gdb_stderr,
+            _("Could not attach to process.  If your uid matches the uid of the target\n"
+              "process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try\n"
+              "again as the root user.  For more details, see /etc/sysctl.d/10-ptrace.conf\n"));
+        }
+      perror_with_name (("ptrace"));
+    }
 #else
   error (_("This system does not support attaching to a process"));
 #endif