[PATCH net-next 06/17] net: Update the per network namespace sysctls to be available to the network namespace owner
From: Eric W. Biederman <hidden>
Date: 2012-11-16 13:03:01
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: "Eric W. Biederman" <ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org> - 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-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org> --- net/sysctl_net.c | 12 +++++++++++- 1 files changed, 11 insertions(+), 1 deletions(-)
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; }
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1.7.5.4