linux-kernel - Re: Linux 6.2-rc2

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Date:   Wed, 04 Jan 2023 21:34:07 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Ard Biesheuvel <ardb@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, Arnd Bergmann <arnd@...db.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Palmer Dabbelt <palmer@...osinc.com>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: Linux 6.2-rc2

Ard Biesheuvel <ardb@...nel.org> writes:
> On Tue, 3 Jan 2023 at 03:13, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>>
>> On Mon, Jan 2, 2023 at 5:45 PM Guenter Roeck <linux@...ck-us.net> wrote:
>> >
>> > ... and reverting commit 99cb0d917ff indeed fixes the problem.
>>
>> Hmm. My gut feel is that this just exposes some bug in binutils.
...
>> It really shouldn't matter, but here we are, with a build problem with
>> some random old binutils on an odd platform..
>>
>
> AIUI, the way ld.bfd used to combine output sections may also affect
> the /DISCARD/ pseudo-section, and so introducing it much earlier
> results in these discards to be interpreted in a different order.
>
> The purpose of this change is to prevent .note.GNU-stack from deciding
> the section type of the .notes output section, and so keeping it in
> its own section should be sufficient. E.g.,
>
> --- a/include/asm-generic/vmlinux.lds.h
> +++ b/include/asm-generic/vmlinux.lds.h
> @@ -896,7 +896,7 @@
>   * Otherwise, the type of .notes section would become PROGBITS
> instead of NOTES.
>   */
>  #define NOTES                                                          \
> -       /DISCARD/ : { *(.note.GNU-stack) }                              \
> +       .note.GNU-stack : { *(.note.GNU-stack) }                        \
>         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
>                 BOUNDED_SECTION_BY(.note.*, _notes)                     \
>         } NOTES_HEADERS                                                 \

This also fixes errors seen in the powerpc build with binutils <= 2.35.

Tested-by: Michael Ellerman <mpe@...erman.id.au> (powerpc)

cheers