On Mon, 11 Jan 2021 14:00:42 +0100 Greg Kroah-Hartman wrote:
From: Petr Machata me@pmachata.org
[ 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 manipulation.
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 enforced.
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@pmachata.org Link: https://lore.kernel.org/r/a2a9b88418f3a58ef211b718f2970128ef9e3793.160867364... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
Unfortunately we need to call backsies on this one.
A fix up was just posted:
https://patchwork.kernel.org/project/netdevbpf/patch/a3edcfda0825f2aa2591801...
I'll resend both in the next submission.