Patchwork [net-next,06/17] net: Update the per network namespace sysctls to be available to the network namespace owner

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Submitter Eric W. Biederman
Date Nov. 16, 2012, 1:03 p.m.
Message ID <1353070992-5552-6-git-send-email-ebiederm@xmission.com>
Download mbox | patch
Permalink /patch/199575/
State Accepted
Delegated to: David Miller
Headers show

Comments

Eric W. Biederman - Nov. 16, 2012, 1:03 p.m.
From: "Eric W. Biederman" <ebiederm@xmission.com>

- Allow anyone with CAP_NET_ADMIN rights in the user namespace of the
  the netowrk namespace to change sysctls.
- Allow anyone the uid of the user namespace root the same
  permissions over the network namespace sysctls as the global root.
- Allow anyone with gid of the user namespace root group the same
  permissions over the network namespace sysctl as the global root group.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
 net/sysctl_net.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)

Patch

diff --git a/net/sysctl_net.c b/net/sysctl_net.c
index e98f393..6410436 100644
--- a/net/sysctl_net.c
+++ b/net/sysctl_net.c
@@ -41,11 +41,21 @@  static int is_seen(struct ctl_table_set *set)
 static int net_ctl_permissions(struct ctl_table_header *head,
 			       struct ctl_table *table)
 {
+	struct net *net = container_of(head->set, struct net, sysctls);
+	kuid_t root_uid = make_kuid(net->user_ns, 0);
+	kgid_t root_gid = make_kgid(net->user_ns, 0);
+
 	/* Allow network administrator to have same access as root. */
-	if (capable(CAP_NET_ADMIN)) {
+	if (ns_capable(net->user_ns, CAP_NET_ADMIN) ||
+	    uid_eq(root_uid, current_uid())) {
 		int mode = (table->mode >> 6) & 7;
 		return (mode << 6) | (mode << 3) | mode;
 	}
+	/* Allow netns root group to have the same assess as the root group */
+	if (gid_eq(root_gid, current_gid())) {
+		int mode = (table->mode >> 3) & 7;
+		return (mode << 3) | (mode << 3) | mode;
+	}
 	return table->mode;
 }