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net: Update the per network namespace sysctls to be available to the network namespace owner 

- 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>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman 2012-11-16 03:03:01 +00:00 committed by David S. Miller
parent dfc47ef863
commit cff109768b
1 changed files with 11 additions and 1 deletions
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12
net/sysctl_net.c
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@ -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;
}