close(2) not being audited?

[Timothy R. Chavez]

On Fri, 26 Jan 2007 18:20:51 -0500
Alexander Viro <aviro at redhat.com> wrote:

> On Fri, Jan 26, 2007 at 05:01:12PM -0600, Timothy R. Chavez wrote:
> > > Please, define "access".  Consider the following sequence:
> > > 	on April 1st:
> > > 	fd = open(foo, O_RDWR);
> > > 	p = mmap(..., fd, ...);
> > > 	close(fd);
> > > 	two days later: modify area pointed to by p
> > > 	a month later: munmap(p, ...);
> > > 
> > > What do you want in the log?  More specifically, _when_ do you want it?
> > 
> > Write out a log when the last reference to the fd is put back... whether
> > that's from a close or an munmap.
> 
> Sigh...  One more time: there are two distinct classes of objects - opened
> files and opened descriptors.  That's the point - by the time of munmap()
> there is no file descriptor at all.  It's been gone for a month.
> 
> Descriptor getting closed != file getting closed.  If you are talking about
> the last reference to opened file - OK.  But there won't necessary be
> any descriptors refering to it.

Yep, I was referring to last reference to opened file.

I'd hate to suggest adding a field to the file like "opened_as" which would
store the original fd it was assigned, but that would be enough to associate
the open() record and the final "close" record.

-tim

PS: Ugh, at this list for being write-protected :).