net: Update the sysctl permissions handler to test effective uid/gid

Modify the code to use current_euid(), and in_egroup_p, as in done
in fs/proc/proc_sysctl.c:test_perm()

Cc: stable@vger.kernel.org
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Reported-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/net/sysctl_net.c b/net/sysctl_net.c
index 9bc6db0..e7000be 100644 (file)
--- a/net/sysctl_net.c
+++ b/net/sysctl_net.c
@@ -47,12 +47,12 @@ static int net_ctl_permissions(struct ctl_table_header *head,
 
        /* Allow network administrator to have same access as root. */
        if (ns_capable(net->user_ns, CAP_NET_ADMIN) ||
-           uid_eq(root_uid, current_uid())) {
+           uid_eq(root_uid, current_euid())) {
                int mode = (table->mode >> 6) & 7;
                return (mode << 6) | (mode << 3) | mode;
        }
        /* Allow netns root group to have the same access as the root group */
-       if (gid_eq(root_gid, current_gid())) {
+       if (in_egroup_p(root_gid)) {
                int mode = (table->mode >> 3) & 7;
                return (mode << 3) | mode;
        }