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

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Message-ID: <CAHk-=wjmREcirYi4k_CBT+2U8X5VOAjQn0tVD28OdcKJKpA0zg@mail.gmail.com>
Date:   Wed, 22 Jun 2022 10:19:31 -0500
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:     Nathan Chancellor <nathan@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: mainline build failure due to 281d0c962752 ("fortify: Add Clang support")

On Wed, Jun 22, 2022 at 10:08 AM Sudip Mukherjee
<sudipm.mukherjee@...il.com> wrote:
>
> Yeah, true. I had to check to find out its from the memcpy() in check_image_valid().

Funky but true - I can reproduce it, and just commenting out that
memcpy fixes the warning.

And I see nothing wrong with that code - it's copying a 'struct
fw_section_info_st' between two other structs that seem to have arrays
that are appropriately sized.

Replacing the memcpy() with just a structure assignment seems to get
rid of the warning, and seems to be a simple fix (patch attached), but
I don't understand why that memcpy() would warn.

This looks like a clang bug to me, but maybe I'm missing something.

                  Linus

View attachment "patch.diff" of type "text/x-patch" (829 bytes)