[PATCH 4.4 26/31] net: dcb: Validate netlink message in DCB handler

From: Greg Kroah-Hartman
Date: Fri Jan 22 2021 - 15:11:15 EST

From: Petr Machata <me@xxxxxxxxxxxx>

[ Upstream commit 826f328e2b7e8854dd42ea44e6519cd75018e7b1 ]

DCB uses the same handler function for both RTM_GETDCB and RTM_SETDCB
messages. dcb_doit() bounces RTM_SETDCB mesasges if the user does not have
the CAP_NET_ADMIN capability.

However, the operation to be performed is not decided from the DCB message
type, but from the DCB command. Thus DCB_CMD_*_GET commands are used for
reading DCB objects, the corresponding SET and DEL commands are used for

The assumption is that set-like commands will be sent via an RTM_SETDCB
message, and get-like ones via RTM_GETDCB. However, this assumption is not

It is therefore possible to manipulate DCB objects without CAP_NET_ADMIN
capability by sending the corresponding command in an RTM_GETDCB message.
That is a bug. Fix it by validating the type of the request message against
the type used for the response.

Fixes: 2f90b8657ec9 ("ixgbe: this patch adds support for DCB to the kernel and ixgbe driver")
Signed-off-by: Petr Machata <me@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/a2a9b88418f3a58ef211b718f2970128ef9e3793.1608673640.git.me@xxxxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
net/dcb/dcbnl.c | 2 ++
1 file changed, 2 insertions(+)

--- a/net/dcb/dcbnl.c
+++ b/net/dcb/dcbnl.c
@@ -1725,6 +1725,8 @@ static int dcb_doit(struct sk_buff *skb,
fn = &reply_funcs[dcb->cmd];
if (!fn->cb)
+ if (fn->type != nlh->nlmsg_type)
+ return -EPERM;

return -EINVAL;