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authorJakub Kicinski <kuba@kernel.org>2022-08-25 03:18:30 +0300
committerDavid S. Miller <davem@davemloft.net>2022-08-29 14:47:15 +0300
commit9c5d03d362519f36cd551aec596388f895c93d2d (patch)
tree5669b75a062436435dc9d4354c668d0f61b7146c /net/batman-adv
parent53a406803ca5b0b1f91beffacad4321fae4fa2a7 (diff)
downloadlinux-9c5d03d362519f36cd551aec596388f895c93d2d.tar.xz
genetlink: start to validate reserved header bytes
We had historically not checked that genlmsghdr.reserved is 0 on input which prevents us from using those precious bytes in the future. One use case would be to extend the cmd field, which is currently just 8 bits wide and 256 is not a lot of commands for some core families. To make sure that new families do the right thing by default put the onus of opting out of validation on existing families. Signed-off-by: Jakub Kicinski <kuba@kernel.org> Acked-by: Paul Moore <paul@paul-moore.com> (NetLabel) Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/batman-adv')
-rw-r--r--net/batman-adv/netlink.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/batman-adv/netlink.c b/net/batman-adv/netlink.c
index 00875e1d8c44..a5e4a4e976cf 100644
--- a/net/batman-adv/netlink.c
+++ b/net/batman-adv/netlink.c
@@ -1493,6 +1493,7 @@ struct genl_family batadv_netlink_family __ro_after_init = {
.module = THIS_MODULE,
.small_ops = batadv_netlink_ops,
.n_small_ops = ARRAY_SIZE(batadv_netlink_ops),
+ .resv_start_op = BATADV_CMD_SET_VLAN + 1,
.mcgrps = batadv_netlink_mcgrps,
.n_mcgrps = ARRAY_SIZE(batadv_netlink_mcgrps),
};