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Subject: Re: [PATCH] wifi: ath9k: fix clang-specific fortify warnings
From:   Kalle Valo <kvalo@kernel.org>
In-Reply-To: <20230829093856.234584-1-dmantipov@yandex.ru>
References: <20230829093856.234584-1-dmantipov@yandex.ru>
To:     Dmitry Antipov <dmantipov@yandex.ru>
Cc:     =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= <toke@toke.dk>,
        linux-wireless@vger.kernel.org,
        Dmitry Antipov <dmantipov@yandex.ru>
User-Agent: pwcli/0.1.1-git (https://github.com/kvalo/pwcli/) Python/3.11.2
Message-ID: <169521581913.1118199.501040563383368808.kvalo@kernel.org>
Date:   Wed, 20 Sep 2023 13:17:00 +0000 (UTC)
Precedence: bulk

Dmitry Antipov <dmantipov@yandex.ru> wrote:

> When compiling with clang 16.0.6 and CONFIG_FORTIFY_SOURCE=y, I've
> noticed the following (somewhat confusing due to absence of an actual
> source code location):
> 
> In file included from drivers/net/wireless/ath/ath9k/debug.c:17:
> In file included from ./include/linux/slab.h:16:
> In file included from ./include/linux/gfp.h:7:
> In file included from ./include/linux/mmzone.h:8:
> In file included from ./include/linux/spinlock.h:56:
> In file included from ./include/linux/preempt.h:79:
> In file included from ./arch/x86/include/asm/preempt.h:9:
> In file included from ./include/linux/thread_info.h:60:
> In file included from ./arch/x86/include/asm/thread_info.h:53:
> In file included from ./arch/x86/include/asm/cpufeature.h:5:
> In file included from ./arch/x86/include/asm/processor.h:23:
> In file included from ./arch/x86/include/asm/msr.h:11:
> In file included from ./arch/x86/include/asm/cpumask.h:5:
> In file included from ./include/linux/cpumask.h:12:
> In file included from ./include/linux/bitmap.h:11:
> In file included from ./include/linux/string.h:254:
> ./include/linux/fortify-string.h:592:4: warning: call to '__read_overflow2_field'
> declared with 'warning' attribute: detected read beyond size of field (2nd
> parameter); maybe use struct_group()? [-Wattribute-warning]
>                         __read_overflow2_field(q_size_field, size);
> 
> In file included from drivers/net/wireless/ath/ath9k/htc_drv_debug.c:17:
> In file included from drivers/net/wireless/ath/ath9k/htc.h:20:
> In file included from ./include/linux/module.h:13:
> In file included from ./include/linux/stat.h:19:
> In file included from ./include/linux/time.h:60:
> In file included from ./include/linux/time32.h:13:
> In file included from ./include/linux/timex.h:67:
> In file included from ./arch/x86/include/asm/timex.h:5:
> In file included from ./arch/x86/include/asm/processor.h:23:
> In file included from ./arch/x86/include/asm/msr.h:11:
> In file included from ./arch/x86/include/asm/cpumask.h:5:
> In file included from ./include/linux/cpumask.h:12:
> In file included from ./include/linux/bitmap.h:11:
> In file included from ./include/linux/string.h:254:
> ./include/linux/fortify-string.h:592:4: warning: call to '__read_overflow2_field'
> declared with 'warning' attribute: detected read beyond size of field (2nd
> parameter); maybe use struct_group()? [-Wattribute-warning]
>                         __read_overflow2_field(q_size_field, size);
> 
> The compiler actually complains on 'ath9k_get_et_strings()' and
> 'ath9k_htc_get_et_strings()' due to the same reason: fortification logic
> inteprets call to 'memcpy()' as an attempt to copy the whole array from
> it's first member and so issues an overread warning. These warnings may
> be silenced by passing an address of the whole array and not the first
> member to 'memcpy()'.
> 
> Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
> Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>
> Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>

Patch applied to ath-next branch of ath.git, thanks.

95f97fe0ac97 wifi: ath9k: fix clang-specific fortify warnings

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20230829093856.234584-1-dmantipov@yandex.ru/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches