netdev - [PATCH net] genetlink: limit the use of validation workarounds to old ops

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Message-Id: <20221026001524.1892202-1-kuba@kernel.org>
Date:   Tue, 25 Oct 2022 17:15:24 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, edumazet@...gle.com, pabeni@...hat.com,
        jacob.e.keller@...el.com, johannes@...solutions.net,
        Jakub Kicinski <kuba@...nel.org>, jiri@...dia.com
Subject: [PATCH net] genetlink: limit the use of validation workarounds to old ops

During review of previous change another thing came up - we should
limit the use of validation workarounds to old commands.
Don't list the workarounds one by one, as we're rejecting all existing
ones. We can deal with the masking in the unlikely event that new flag
is added.

Link: https://lore.kernel.org/all/6ba9f727e555fd376623a298d5d305ad408c3d47.camel@sipsolutions.net/
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
CC: jiri@...dia.com
---
 net/netlink/genetlink.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index b1fd059c9992..3e16527beb91 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -380,6 +380,8 @@ static int genl_validate_ops(const struct genl_family *family)
 		genl_get_cmd_by_index(i, family, &op);
 		if (op.dumpit == NULL && op.doit == NULL)
 			return -EINVAL;
+		if (WARN_ON(op.cmd >= family->resv_start_op && op.validate))
+			return -EINVAL;
 		for (j = i + 1; j < genl_get_cmd_cnt(family); j++) {
 			struct genl_ops op2;
 
-- 
2.37.3