Seth, thank you kindly for your prompt and clear answer. I modified
server.c and confirm that gdb can now attach to the child process.
Although prctl(PR_SET_DUMPABLE, 1) has no effect (and returns 0!) when
called before resetting privileges, it works after the gid has been
reset to the debugging p
Hello, this appears to be working as designed.
In Linux, process tracing is tied with the process dumping flag. The
dumpable flag is cleared at execve(2) time when a setuid or setgid
application is executed. This flag persists to child processes created
by fork(2) and will only be reset when a pro
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