[openib-general] Re: [PATCH repost] PROT_DONTCOPY: ifiniband uverbs fork support

[Hugh Dickins]

On Wed, 10 Aug 2005, Gleb Natapov wrote:
> On Wed, Aug 10, 2005 at 02:22:40PM +0100, Hugh Dickins wrote:
> > 
> > Your stack example is a good one: if we end up setting VM_DONTCOPY on
> > the user stack, then I don't think fork's child will get very far without
> > hitting a SIGSEGV.
> 
> I know, but I prefer child SIGSEGV than silent data corruption.

Most people will share your preference, but neither is satisfactory.

> In most cases child will exec immediately after fork so no problem
> in this case.

In most(?) cases it won't even be able to exec before the SIGSEGV.

Hugh