linux-kernel - mainline build failure due to 281d0c962752 ("fortify: Add Clang support")

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Date:   Wed, 22 Jun 2022 11:23:34 +0100
From:   Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:     Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: mainline build failure due to 281d0c962752 ("fortify: Add Clang
 support")

Hi All,

I have recently (since yesterday) started building the mainline kernel
with clang-14 and I am seeing a build failure with allmodconfig.

In file included from drivers/net/ethernet/huawei/hinic/hinic_devlink.c:15:
In file included from ./include/linux/netlink.h:7:
In file included from ./include/linux/skbuff.h:15:
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:22:
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:253:
./include/linux/fortify-string.h:344:4: error: call to __write_overflow_field declared with 'warning' attribute: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror,-Wattribute-warning]
                        __write_overflow_field(p_size_field, size);

After a bisect it pointed to 281d0c962752 ("fortify: Add Clang support").
Since it was introduced in v5.18, not sure if its already reported before.


--
Regards
Sudip