Messages in this thread | | | Subject | Re: [Bug 210655] ptrace.2: documentation is incorrect about access checking threads in same thread group | From | Ted Estes <> | Date | Tue, 15 Dec 2020 12:31:11 -0600 |
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Per my research on the topic, the error is in the manual page. The behavior of ptrace(2) was intentionally changed to prohibit attaching to a thread in the same group. Apparently, there were a number of ill-behaved edge cases.
I found this email thread on the subject: https://lkml.org/lkml/2006/8/31/241
Thank you. --Ted Estes
On 12/15/2020 11:01 AM, Alejandro Colomar (man-pages) wrote: > Hi, > > There's a bug report: https://bugzilla.kernel.org/show_bug.cgi?id=210655 > > [[ > 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() > https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/kernel/ptrace.c?h=v5.9.14#n380 > ]] > > I just wanted to make sure that it is a bug in the manual page, and not > in the implementation. > > > Thanks, > > Alex >
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