linux-kernel - Re: [PATCH v7 03/11] kbuild: generate KSYMTAB entries by modpost

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAK7LNAQfqXU+MFucqsaQmKALgz1f909G0+6ycEUd6+kgeiv2ww@mail.gmail.com>
Date:   Sat, 10 Jun 2023 17:56:22 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        linux-um@...ts.infradead.org
Subject: Re: [PATCH v7 03/11] kbuild: generate KSYMTAB entries by modpost

On Thu, Jun 8, 2023 at 11:24 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> Commit 7b4537199a4a ("kbuild: link symbol CRCs at final link, removing
> CONFIG_MODULE_REL_CRCS") made modpost output CRCs in the same way
> whether the EXPORT_SYMBOL() is placed in *.c or *.S.
>
> For further cleanups, this commit applies a similar approach to the
> entire data structure of EXPORT_SYMBOL().
>
> The EXPORT_SYMBOL() compilation is split into two stages.
>
> When a source file is compiled, EXPORT_SYMBOL() is converted into a
> dummy symbol in the .export_symbol section.
>
> For example,
>
>     EXPORT_SYMBOL(foo);
>     EXPORT_SYMBOL_NS_GPL(bar, BAR_NAMESPACE);
>
> will be encoded into the following assembly code:
>
>     .section ".export_symbol","a"
>     __export_symbol__foo:
>             .asciz ""
>             .balign 4
>             .long foo - .


I hope this will work for all arches, but
unfortunately, the 0day bot reported breakages
on xtensa.

I will restore the code in v6.







-- 
Best Regards
Masahiro Yamada