net: cxgb3_main: Add CAP_NET_ADMIN check to CHELSIO_GET_MEM
authorMichael Ellerman <mpe@ellerman.id.au>
Fri, 24 Jan 2020 09:41:44 +0000 (20:41 +1100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 29 Jan 2020 15:43:15 +0000 (16:43 +0100)
commit404d333fd36172ee7730c9a17746d3e35a167f5d
treeae4549ed24ae3f5cc9c56284f48ec6e6c4aea58c
parent0705c8d7aae518e4cb22c68749eaac917e9902b8
net: cxgb3_main: Add CAP_NET_ADMIN check to CHELSIO_GET_MEM

[ Upstream commit 3546d8f1bbe992488ed91592cf6bf76e7114791a =

The cxgb3 driver for "Chelsio T3-based gigabit and 10Gb Ethernet
adapters" implements a custom ioctl as SIOCCHIOCTL/SIOCDEVPRIVATE in
cxgb_extension_ioctl().

One of the subcommands of the ioctl is CHELSIO_GET_MEM, which appears
to read memory directly out of the adapter and return it to userspace.
It's not entirely clear what the contents of the adapter memory
contains, but the assumption is that it shouldn't be accessible to all
users.

So add a CAP_NET_ADMIN check to the CHELSIO_GET_MEM case. Put it after
the is_offload() check, which matches two of the other subcommands in
the same function which also check for is_offload() and CAP_NET_ADMIN.

Found by Ilja by code inspection, not tested as I don't have the
required hardware.

Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c