Re: [PATCH v3 1/2] clone3: add CLONE_CLEAR_SIGHAND

On 10/14, Christian Brauner wrote:

The child helper process on Linux posix_spawn must ensure that no signal
handlers are enabled, so the signal disposition must be either SIG_DFL
or SIG_IGN. However, it requires a sigprocmask to obtain the current
signal mask and at least _NSIG sigaction calls to reset the signal
handlers for each posix_spawn call

Plus the caller has to block/unblock all signals around clone(VM|VFORK).

Can this justify the new CLONE_ flag? Honestly, I have no idea. But the
patch is simple and looks technically correct to me. FWIW,

Reviewed-by: Oleg Nesterov <oleg@redhat.com>