netdev - RE: netlink scm creds uid and gids are always 0.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Fri, 24 Aug 2012 10:45:17 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Eric Dumazet" <eric.dumazet@...il.com>
Cc:	<netdev@...r.kernel.org>
Subject: RE: netlink scm creds uid and gids are always 0.

> There is still a possible issue with netlink sockets and pids when the
> two processes talking over netlink are in different pid namespaces.

Isn't there a more general problem of the sending process exiting
and its pid being reused before the receiving program makes use
of the value?

IIRC 2.6.27 tried to alleviate this for some code paths by
using a reference-counted structure for some kernel calls.
(A PITA because the function to lose the reference is exported
GPL_ONLY ...)

	David

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html