Greg Stark wrote: > On Wed, Aug 20, 2014 at 2:27 PM, Alvaro Herrera > <alvhe...@2ndquadrant.com> wrote: > > Hmm, the real trick here is linkat(... "/proc/self/foobar"), not the > > O_TMPFILE: you can have an open file descriptor to an "invisible" file > > simply by creating a normal file and unlinking it. I looked at linkat() > > yesterday but the idea of using /proc/self didn't occur to me. Nasty > > trick :-( It seems linkat() is quite a bit more portable than > > O_TMPFILE, fortunately ... > > Supposedly linkat(2) on Linux refuses to create a link to a file that > was opened normally and had its last link removed with unlink(2) due > to concerns that this would create security holes.
Sigh. -- Álvaro Herrera http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
