selinux/nlmsg: add a build time check for rtnl/xfrm cmds

When a new rtnl or xfrm command is added, this part of the code is frequently
missing. Let's help the developer with a build time test.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/security/selinux/nlmsgtab.c b/security/selinux/nlmsgtab.c
index 30594bfa5fb1..2bbb41822d8e 100644
--- a/security/selinux/nlmsgtab.c
+++ b/security/selinux/nlmsgtab.c
@@ -153,6 +153,8 @@ int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
 
         switch (sclass) {
         case SECCLASS_NETLINK_ROUTE_SOCKET:
+                /* RTM_MAX always point to RTM_SETxxxx, ie RTM_NEWxxx + 3 */
+                BUILD_BUG_ON(RTM_MAX != (RTM_NEWNSID + 3));
                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
                                  sizeof(nlmsg_route_perms));
                 break;
@@ -163,6 +165,7 @@ int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
                 break;
 
         case SECCLASS_NETLINK_XFRM_SOCKET:
+                BUILD_BUG_ON(XFRM_MSG_MAX != XFRM_MSG_MAPPING);
                 err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
                                  sizeof(nlmsg_xfrm_perms));
                 break;