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| author | Jakub Kicinski <kuba@kernel.org> | 2022-08-24 17:18:30 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-08-29 12:47:15 +0100 |
| commit | 9c5d03d362519f36cd551aec596388f895c93d2d (patch) | |
| tree | 5669b75a062436435dc9d4354c668d0f61b7146c /net/batman-adv | |
| parent | 53a406803ca5b0b1f91beffacad4321fae4fa2a7 (diff) | |
| download | linux-stable-9c5d03d362519f36cd551aec596388f895c93d2d.tar.gz linux-stable-9c5d03d362519f36cd551aec596388f895c93d2d.tar.bz2 linux-stable-9c5d03d362519f36cd551aec596388f895c93d2d.zip | |
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.c | 1 |
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), }; |