[Users] [Bug 2828] Use MD5 digest for socket name

Sharon Kimble boudiccas at talktalk.net
Thu Nov 29 17:28:42 CET 2012

On Thu, 29 Nov 2012 11:02:29 -0500
ratinox at gweep.net wrote:

Three emails all saying the exact same thing from you, has your 'send'
finger developed a stutter?


> On Thu, 29 Nov 2012 09:33:59 +0100
> Ricardo Mones <ricardo at mones.org> wrote:
> >   That's not what was being claimed... but yes, it is. It could
> > also be seen as a nice local DoS attack, because is trivial to
> > create the same file as any other user in /tmp (home config dirs
> > are easily guessable). So I think /tmp is not the right place for
> > this.
> /tmp really is the best place to put the lock if you want to have
> multiple UIDs sharing a single configuration directory. All UIDs
> sharing the configuration must be able to see the lock socket. If the
> lock is unique to one UID then the other UID will not see it. This
> would permit multiple simultaneous access to a single configuration.
> This is not desired and is therefore a bug.
> /tmp is a good place to put the lock anyway. Locks need to be visible
> to all processes that might try to claim the resources. Privatizing a
> lock makes it impossible for other processes to see it.
> Yes, it's vulnerable to a local denial of service. So is using
> /tmp/claws-mail-${UID} as the lock socket name.
> Old, unused sockets aren't an issue. The periodic /tmp cleaner will
> reap them.
> >   D'oh! So you claim A, when shown A is false you jump the it's a
> > feature wagon running on the opposite direction... Amazing :)
> I can't help it if you misinterpreted my writing that "two UIDs could
> share a configuration directory" as "two UIDs could share a
> configuration directory simultaneously".
> >   Don't be shy, very likely nobody else is going to do it ;)
> Nope. It's impossible to do reliably. Look at the BUGS section of the
> realpath(3) man page.

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