[Devel] [PATCH RHEL7 COMMIT] netlink: protect NETLINK_REPAIR2

[Vasily Averin]

The commit is pushed to "branch-rh7-3.10.0-1127.18.2.vz7.163.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-1127.18.2.vz7.163.41
------>
commit 6fdae411d87f42d6fab634955697849e7e7bea1f
Author: Andrey Zhadchenko <andrey.zhadchenko at virtuozzo.com>
Date:   Thu Oct 29 17:00:53 2020 +0300

    netlink: protect NETLINK_REPAIR2
    
    Prevent using netlink repair mode from containers.
    
    Signed-off-by: Andrey Zhadchenko <andrey.zhadchenko at virtuozzo.com>
---
 net/netlink/af_netlink.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 7b3de33..6c99bca 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1529,6 +1529,13 @@ static int netlink_setsockopt(struct socket *sock, int level, int optname,
 
 	switch (optname) {
 	case NETLINK_REPAIR2:
+#ifdef CONFIG_VE
+		{
+			struct ve_struct *ve = get_exec_env();
+			if (!ve_is_super(ve) && !ve->is_pseudosuper)
+				return -ENOPROTOOPT;
+		}
+#endif
 		if (val)
 			nlk->flags |= NETLINK_F_REPAIR;
 		else