linux-kernel - [PATCH RFC kspp-next 0/3] compiler_types: add Endianness-dependent __counted_by

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Message-ID: <20240318130354.2713265-1-aleksander.lobakin@intel.com>
Date: Mon, 18 Mar 2024 14:03:51 +0100
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: linux-hardening@...r.kernel.org
Cc: Alexander Lobakin <aleksander.lobakin@...el.com>,
	Kees Cook <keescook@...omium.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: [PATCH RFC kspp-next 0/3] compiler_types: add Endianness-dependent __counted_by_{le,be}

Some structures contain flexible arrays at the end and the counter for
them, but the counter has explicit Endianness and thus __counted_by()
can't be used directly.

To increase test coverage for potential problems without breaking
anything, introduce __counted_by_{le,be} defined depending on platform's
Endianness to either __counted_by() when applicable or noop otherwise.
The first user will be virtchnl2.h from idpf just as example with 9 flex
structures having Little Endian counters.

Maybe it would be a good idea to introduce such attributes on compiler
level if possible, but for now let's stop on what we have.

Alexander Lobakin (3):
  compiler_types: add Endianness-dependent __counted_by_{le,be}
  idpf: make virtchnl2.h self-contained
  idpf: sprinkle __counted_by{,_le}() in the virtchnl2 header

 include/linux/compiler_types.h              | 11 ++++++++++
 drivers/net/ethernet/intel/idpf/virtchnl2.h | 24 ++++++++++-----------
 2 files changed, 23 insertions(+), 12 deletions(-)

-- 
2.44.0