Re: Postfix design directions

[cadams () RO COM (Chris Adams)]

Once upon a time, Wietse Venema <wietse () PORCUPINE ORG> said:
> Attack 2 is a wash. Postfix deletes a queue file that has multiple
> links, so that the link count goes down; Postfix delivers a queue
> file that has one hard link and that satisfies the Postfix-specific
> record structure and record sequence requirements; Postfix discards
> any other queue file.

Seems like there could be race conditions here too.  For example, if you
check the link count, and if it is 1, process the file and unlink it,
someone could wait until you are processing the file to create a hard
link to it.  Then, after you unlinked the first copy, the second copy
would again have a link count of 1.

--
Chris Adams - cadams () ro com
System Administrator - Renaissance Internet Services
I don't speak for anybody but myself - that's enough trouble.