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genetlink: start to validate reserved header bytes

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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>
This commit is contained in:
Jakub Kicinski 2022-08-24 17:18:30 -07:00 • committed by David S. Miller
parent 53a406803c
commit 9c5d03d362
47 changed files with 56 additions and 2 deletions
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1
net/ieee802154/netlink.c
View file

@ -132,6 +132,7 @@ struct genl_family nl802154_family __ro_after_init = {
.module = THIS_MODULE,
.small_ops = ieee802154_ops,
.n_small_ops = ARRAY_SIZE(ieee802154_ops),
.resv_start_op = IEEE802154_LLSEC_DEL_SECLEVEL + 1,
.mcgrps = ieee802154_mcgrps,
.n_mcgrps = ARRAY_SIZE(ieee802154_mcgrps),
};

1
net/ieee802154/nl802154.c
View file

@ -2500,6 +2500,7 @@ static struct genl_family nl802154_fam __ro_after_init = {
.module = THIS_MODULE,
.ops = nl802154_ops,
.n_ops = ARRAY_SIZE(nl802154_ops),
.resv_start_op = NL802154_CMD_DEL_SEC_LEVEL + 1,
.mcgrps = nl802154_mcgrps,
.n_mcgrps = ARRAY_SIZE(nl802154_mcgrps),
};