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

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

On 10/21, Oleg Nesterov wrote:

quoted

On 10/14, Christian Brauner wrote:

quoted

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