linux-hardening - Re: [PATCH RFC kspp-next 3/3] idpf: sprinkle __counted_by{,

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Date: Tue, 19 Mar 2024 14:42:56 -0700
From: Kees Cook <keescook@...omium.org>
To: Simon Horman <horms@...nel.org>
Cc: Alexander Lobakin <aleksander.lobakin@...el.com>,
	linux-hardening@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Marco Elver <elver@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC kspp-next 3/3] idpf: sprinkle __counted_by{,_le}() in
 the virtchnl2 header

On Tue, Mar 19, 2024 at 06:57:18PM +0000, Simon Horman wrote:
> On Mon, Mar 18, 2024 at 02:03:54PM +0100, Alexander Lobakin wrote:
> > Both virtchnl2.h and its consumer idpf_virtchnl.c are very error-prone.
> > There are 10 structures with flexible arrays at the end, but 9 of them
> > has flex member counter in Little Endian.
> > Make the code a bit more robust by applying __counted_by_le() to those
> > 9. LE platforms is the main target for this driver, so they would
> > receive additional protection.
> > While we're here, add __counted_by() to virtchnl2_ptype::proto_id, as
> > its counter is `u8` regardless of the Endianness.
> > Compile test on x86_64 (LE) didn't reveal any new issues after applying
> > the attributes.
> > 
> > Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>
> 
> Hi Alexander,
> 
> with this patch applied ./scripts/kernel-doc -none reports the following.
> I think that this means that the kernel-doc needs to be taught
> about __counted_by_le (and __counted_by_be).

Oh, yes, I should have remembered that need. Sorry! It should be
addressed by adding them where __counted_by is already listed in
Documentation/conf.py.

-Kees

> 
> .../virtchnl2.h:559: warning: Excess struct member 'chunks' description in 'virtchnl2_queue_reg_chunks'
> .../virtchnl2.h:707: warning: Excess struct member 'qinfo' description in 'virtchnl2_config_tx_queues'
> .../virtchnl2.h:786: warning: Excess struct member 'qinfo' description in 'virtchnl2_config_rx_queues'
> .../virtchnl2.h:872: warning: Excess struct member 'vchunks' description in 'virtchnl2_vector_chunks'
> .../virtchnl2.h:916: warning: Excess struct member 'lut' description in 'virtchnl2_rss_lut'
> .../virtchnl2.h:1108: warning: Excess struct member 'key_flex' description in 'virtchnl2_rss_key'
> .../virtchnl2.h:1199: warning: Excess struct member 'qv_maps' description in 'virtchnl2_queue_vector_maps'
> .../virtchnl2.h:1251: warning: Excess struct member 'mac_addr_list' description in 'virtchnl2_mac_addr_list'
> 
> ...

-- 
Kees Cook