From: Kees Cook <keescook@chromium.org>
To: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: Jouni Malinen <j@w1.fi>, Kalle Valo <kvalo@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
netdev@vger.kernel.org, linux-wireless@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org
Subject: Re: [PATCH v2 2/6] hostap: Avoid clashing function prototypes
Date: Sat, 29 Oct 2022 00:26:06 -0700 [thread overview]
Message-ID: <202210290025.15F3F949B9@keescook> (raw)
In-Reply-To: <8388b5ed9e729eb9dadec875a7576219e6d61223.1666894751.git.gustavoars@kernel.org>
On Thu, Oct 27, 2022 at 03:18:37PM -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 42 warnings like these:
>
> ../drivers/net/wireless/intersil/hostap/hostap_ioctl.c:3868:2: warning: cast from 'int (*)(struct net_device *, struct iw_request_info *, char *, char *)' to 'iw_handler' (aka 'int (*)(struct net_device *, struct iw_request_info *, union iwreq_data *, char *)') converts to incompatible function type [-Wcast-function-type-strict]
> (iw_handler) prism2_get_name, /* SIOCGIWNAME */
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> The hostap Wireless Extension handler callbacks (iw_handler) use a
> union for the data argument. Actually use the union and perform explicit
> member selection in the function body instead of having a function
> prototype mismatch. There are no resulting binary differences
> before/after changes.
>
> Link: https://github.com/KSPP/linux/issues/235
> Link: https://reviews.llvm.org/D134831 [1]
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Looks like prism2_private_handler contents could be uncast? Otherwise,
yeah, looks good.
--
Kees Cook
next prev parent reply other threads:[~2022-10-29 7:26 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-27 20:16 [PATCH v2 0/6] Avoid clashing function prototypes Gustavo A. R. Silva
2022-10-27 20:17 ` [PATCH v2 1/6] cfg80211: " Gustavo A. R. Silva
2022-10-28 8:22 ` Johannes Berg
2022-10-31 17:01 ` Gustavo A. R. Silva
2022-10-31 21:03 ` Gustavo A. R. Silva
2022-10-27 20:18 ` [PATCH v2 2/6] hostap: " Gustavo A. R. Silva
2022-10-29 7:26 ` Kees Cook [this message]
2022-11-01 9:36 ` Kalle Valo
2022-10-27 20:19 ` [PATCH v2 3/6] zd1201: " Gustavo A. R. Silva
2022-10-29 7:08 ` Kees Cook
2022-10-27 20:20 ` [PATCH v2 4/6] airo: " Gustavo A. R. Silva
2022-10-27 20:20 ` [PATCH v2 5/6] bna: " Gustavo A. R. Silva
2022-10-29 7:12 ` Kees Cook
2022-10-31 17:13 ` Gustavo A. R. Silva
2022-10-31 21:04 ` Gustavo A. R. Silva
2022-10-27 20:22 ` [PATCH v2 6/6] staging: ks7010: " Gustavo A. R. Silva
2022-10-29 7:20 ` Kees Cook
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