linux-kernel - Re: [PATCH v2 5/6] bna: Avoid clashing function prototypes

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Message-ID: <202210290009.C42E731@keescook>
Date:   Sat, 29 Oct 2022 00:12:26 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Sudarsana Kalluru <skalluru@...vell.com>,
        GR-Linux-NIC-Dev@...vell.com, Rasesh Mody <rmody@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2 5/6] bna: Avoid clashing function prototypes

On Thu, Oct 27, 2022 at 03:20:47PM -0500, Gustavo A. R. Silva wrote:
> When built with Control Flow Integrity, function prototypes between
> caller and function declaration must match. These mismatches are visible
> at compile time with the new -Wcast-function-type-strict in Clang[1].
> 
> Fix a total of 227 warnings like these:
> 
> drivers/net/ethernet/brocade/bna/bna_enet.c:519:3: warning: cast from 'void (*)(struct bna_ethport *, enum bna_ethport_event)' to 'bfa_fsm_t' (aka 'void (*)(void *, int)') converts to incompatible function type [-Wcast-function-type-strict]
>                 bfa_fsm_set_state(ethport, bna_ethport_sm_down);
>                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> The bna state machine code heavily overloads its state machine functions,
> so these have been separated into their own sets of structs, enums,
> typedefs, and helper functions. There are almost zero binary code changes,
> all seem to be related to header file line numbers changing, or the
> addition of the new stats helper.

This looks like it borrowed from
https://lore.kernel.org/linux-hardening/20220929230334.2109344-1-keescook@chromium.org/
Nice to get a couple hundred more fixed. :)

> [1] https://reviews.llvm.org/D134831
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
> Changes in v2:
>  - None. This patch is new in the series.

This is relatively stand-alone (not an iw_handler patch), so it could
also go separately too.

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook