From: Joe Perches <joe@perches.com>
To: Serge Hallyn <serge@hallyn.com>
Cc: linux-kernel@vger.kernel.org, ebiederm@xmission.com,
akpm@linux-foundation.org, oleg@redhat.com, richard@nod.at,
mikevs@xs4all.net, segoon@openwall.com, gregkh@suse.de,
dhowells@redhat.com, eparis@redhat.com,
"Serge E. Hallyn" <serge.hallyn@canonical.com>,
netdev@vger.kernel.org
Subject: Re: [PATCH 9/9] make net/core/scm.c uid comparisons user namespace aware
Date: Tue, 18 Oct 2011 15:14:09 -0700 [thread overview]
Message-ID: <1318976049.2273.7.camel@Joe-Laptop> (raw)
In-Reply-To: <1318974898-21431-10-git-send-email-serge@hallyn.com>
On Tue, 2011-10-18 at 21:54 +0000, Serge Hallyn wrote:
> From: "Serge E. Hallyn" <serge.hallyn@canonical.com>
Hi Serge.
Just some trivial style notes.
> Currently uids are compared without regard for the user namespace.
> Fix that to prevent tasks in a different user namespace from
> wrongly matching on SCM_CREDENTIALS.
[]
> diff --git a/net/core/scm.c b/net/core/scm.c
> -static __inline__ int scm_check_creds(struct ucred *creds)
> +static __inline__ bool uidequiv(const struct cred *src, struct ucred *tgt,
> + struct user_namespace *ns)
Perhaps inline is better than __inline__ and do these
functions really need to be marked inline at all?
> +{
> + if (src->user_ns != ns)
> + goto check_capable;
> + if (src->uid == tgt->uid || src->euid == tgt->uid ||
> + src->suid == tgt->uid)
Perhaps this is less prone to typo errors and are a bit
more readable as:
if (tgt->uid == src->uid ||
tgt->uid == src->euid ||
tgt->uid == src->suid)
next prev parent reply other threads:[~2011-10-18 22:14 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-18 21:54 user namespaces: fix some uid/privilege leaks Serge Hallyn
2011-10-18 21:54 ` [PATCH 1/9] pid_ns: ensure pid is not freed during kill_pid_info_as_uid Serge Hallyn
2011-10-18 21:54 ` [PATCH 2/9] user namespace: usb: make usb urbs user namespace aware (v2) Serge Hallyn
2011-10-18 21:54 ` [PATCH 3/9] user namespace: make signal.c respect user namespaces (v4) Serge Hallyn
2011-10-18 21:54 ` [PATCH 4/9] User namespace: don't allow sysctl in non-init user ns (v2) Serge Hallyn
2011-10-18 21:54 ` [PATCH 5/9] user namespace: clamp down users of cap_raised Serge Hallyn
2011-10-19 4:33 ` Andrew G. Morgan
2011-10-19 9:01 ` David Howells
2011-10-20 13:16 ` Serge E. Hallyn
2011-10-24 14:43 ` [PATCH 05/10] " Serge E. Hallyn
2011-10-24 15:47 ` Andrew G. Morgan
2011-10-24 17:28 ` Serge E. Hallyn
2011-10-25 0:43 ` Andrew G. Morgan
2011-10-25 3:03 ` Serge E. Hallyn
2011-10-25 17:33 ` Eric Paris
2011-10-25 20:09 ` Serge E. Hallyn
2011-10-20 13:01 ` [PATCH 5/9] " Serge E. Hallyn
2011-10-18 21:54 ` [PATCH 6/9] Add Documentation/namespaces/user_namespace.txt (v3) Serge Hallyn
2011-10-19 9:36 ` David Howells
2011-10-20 12:58 ` Serge E. Hallyn
2011-10-26 20:33 ` [PATCH 06/10] Add Documentation/namespaces/user_namespace.txt (v4) Serge E. Hallyn
2011-10-18 21:54 ` [PATCH 7/9] user namespace: make each net (net_ns) belong to a user_ns Serge Hallyn
2011-10-18 21:54 ` [PATCH 8/9] protect cap_netlink_recv from user namespaces Serge Hallyn
2011-10-18 21:54 ` [PATCH 9/9] make net/core/scm.c uid comparisons user namespace aware Serge Hallyn
2011-10-18 22:14 ` Joe Perches [this message]
2011-10-18 23:22 ` Serge E. Hallyn
2011-10-19 2:25 ` [PATCH 9/9] make net/core/scm.c uid comparisons user namespace aware (v2) Serge E. Hallyn
2011-10-19 13:52 ` [PATCH 9/9] make net/core/scm.c uid comparisons user namespace aware Eric W. Biederman
2011-10-20 12:58 ` Serge E. Hallyn
2011-10-20 13:35 ` Eric W. Biederman
2011-10-20 14:14 ` Serge E. Hallyn
2011-10-24 4:15 ` Serge E. Hallyn
2011-10-24 4:27 ` Eric W. Biederman
2011-10-20 14:24 ` Serge E. Hallyn
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