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Date:   Tue, 15 Dec 2020 18:01:25 +0100
From:   "Alejandro Colomar (man-pages)" <>
To:     Pavel Emelyanov <>,
        Oleg Nesterov <>,
        Andrew Morton <>,
        Michael Kerrisk <>,
        Kees Cook <>, Jann Horn <>
Cc:     Ted Estes <>,
        linux-man <>,
        linux-kernel <>
Subject: [Bug 210655] ptrace.2: documentation is incorrect about access
 checking threads in same thread group


There's a bug report:

Under "Ptrace access mode checking", the documentation states:
  "1. If the calling thread and the target thread are in the same thread
group, access is always allowed."

This is incorrect. A thread may never attach to another in the same group.

Reference, ptrace_attach()

I just wanted to make sure that it is a bug in the manual page, and not
in the implementation.



Alejandro Colomar
Linux man-pages comaintainer;

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