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

[Christian Brauner]

On Mon, Oct 21, 2019 at 05:12:55PM +0200, Oleg Nesterov wrote:
> 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.

Yeah, I think that is what's currently happening.

Christian