On Thu, Mar 16, 2017 at 01:48:45PM +0100, Dag-Erling Sm??rgrav wrote: > Andrey Chernov <a...@freebsd.org> writes: > > Steven Chamberlain <ste...@pyro.eu.org> writes: > > > Also it is great to see INHERIT_ZERO was added to mmap(2)! > > It is not so great. For a program which forks very often zeroing even > > one page will be slowdown. > > Wouldn't it be possible to just set up the page entry but leave it > unmapped, so that it is paged in (and zeroed if necessary) on first > access? Thus, a process that uses arc4random() and fork()s would not > incur a penalty until (and unless) the child uses arc4random() too. This is how the forking code works, without any additional coding, for the INHERIT_ZERO regions as well.
> > > It will be better and faster to implement it as fork syscall wrapper > > setting single variable, as it already done for threaded lib. > > fork() and vfork() and pdfork() and... From a security point of view, I > prefer to have it in a single place. > > DES > -- > Dag-Erling Sm??rgrav - d...@des.no > _______________________________________________ > freebsd-hack...@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org" _______________________________________________ freebsd-security@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-security To unsubscribe, send any mail to "freebsd-security-unsubscr...@freebsd.org"
