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README: Add a note about ptrace_scope on Ubuntu.

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1 parent ff11f6d commit dad25ddb958f146a6b7aacf5015865ed9c102b07 @nelhage committed Jan 22, 2011
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@@ -50,6 +50,17 @@ reptyr fixes all of these problems, and is the only such tool I know
of that does so. See below for some more details on how it
accomplishes this.
+ptrace_scope on Ubuntu Maverick and up
+--------------------------------------
+
+`reptyr` depends on the `ptrace` system call to attach to the remote program. On
+Ubuntu Maverick and higher, this ability is disabled by default for security
+reasons. You can enable it temporarily by doing
+
+ # echo 0 > /proc/sys/kernel/yama/ptrace_scope
+
+as root, or permanently by editing the file /etc/sysctl.d/10-ptrace.conf, which
+also contains more information about exactly what this setting accomplishes.
reptyr -l
---------

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