The YAMA LSM by default[1] prevents attaching the debugger to any
process that isn't a child. Since our backtracer comes from a child
process instead (i.e., tracing the parent), we must grant explicit
permission. This also makes QTEST_PAUSE_ON_CRASH=1 work.
[1] https://codebrowser.dev/linux/linux/security/yama/yama_lsm.c.html#ptrace_scope
Change-Id: Ic19d84a7a730c7f8fc0ffffd64e516447e4b1f35
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
(cherry picked from commit 731b1159f9da9d0a5f9871ceaef4b82b657b130c)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
5b697bb08c