Even if clone() is invoked with CLONE_UNTRACED, the child process can be traced by strace

Solution Unverified - Updated -

Issue

  • Even if clone() is invoked with CLONE_UNTRACED, the child process can be traced by strace.
    [root@RHEL6 24]# strace -f ./test
...snip...
16074 clone(child_stack=0x18703ff, flags=CLONE_UNTRACED|SIGCHLD) = 16075
...snip...
16074 nanosleep({5, 0}, <unfinished ...>
16075 getpid() = 16075
16075 alarm(5) = 0
16074 <... nanosleep resumed> 0x7fffe901fd10) = 0
16074 exit_group(0) = ?
16075 --- SIGALRM (Alarm clock) @ 0 (0) ---
===

Environment

  • Red Hat Enterprise Linux 6
  • strace-4.5.19-1.6.el6.x86_64

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