D11235: [DrKonqi] Request change of ptrace scope from KCrash

[Christoph Roick]

croick created this revision.
croick added reviewers: Plasma: Workspaces, Frameworks.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.
croick requested review of this revision.

REVISION SUMMARY
  - In Linux recent kernels only allow attaching of processes to a debugger, if
    - the right to attach to processes is enabled system-wide
    - the debugger is a child process of the debuggee
    - or the debuggee grants access by a call to prctl(PR_SET_PTRACER, debugger_pid, 0, 0, 0);
  - DrKonqi cannot do this directly, so it will ask the debuggee to do so by a socket connection.
  - When the debugger has finished, the access is requested back to DrKonqi to allow internal backtraces again.

TEST PLAN
  - try to attach the debugged process to gdb or KDevelop by using the debug button: operation will not be permitted
  - apply corresponding patches to KCrash and DrKonqi
  - the process can now be debugged
  - after detaching the process again, a backtrace can be created using the DrKonqi dialog as usual

REPOSITORY
  R871 DrKonqi

BRANCH
  ptracer

REVISION DETAIL
  https://phabricator.kde.org/D11235

AFFECTED FILES
  src/CMakeLists.txt
  src/debuggerlaunchers.cpp
  src/debuggerlaunchers.h
  src/queryptrace.cpp
  src/queryptrace.h
  src/tests/crashtest/crashtest.cpp

To: croick, #plasma_workspaces, #frameworks
Cc: plasma-devel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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