From: David Miller <davem@davemloft.net>
To: mpe@ellerman.id.au
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
security@kernel.org, ivansprundel@ioactive.com,
vishal@chelsio.com
Subject: Re: [PATCH] net: cxgb3_main: Add CAP_NET_ADMIN check to CHELSIO_GET_MEM
Date: Sat, 25 Jan 2020 10:53:21 +0100 (CET) [thread overview]
Message-ID: <20200125.105321.1408762540319080985.davem@davemloft.net> (raw)
In-Reply-To: <20200124094144.15831-1-mpe@ellerman.id.au>
From: Michael Ellerman <mpe@ellerman.id.au>
Date: Fri, 24 Jan 2020 20:41:44 +1100
> 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>
Applied and queued up for -stable.
prev parent reply other threads:[~2020-01-25 9:53 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-24 9:41 [PATCH] net: cxgb3_main: Add CAP_NET_ADMIN check to CHELSIO_GET_MEM Michael Ellerman
2020-01-25 8:48 ` Sergei Shtylyov
2020-01-28 9:42 ` Michael Ellerman
2020-01-25 9:53 ` David Miller [this message]
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