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

[Oleg Nesterov]

On 10/21, Oleg Nesterov wrote:
>
> 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).
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

just in case... I meant that posix_spawn() has to block/unblock, not its
caller.

> 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@xxxxxxxxxx>