linux-kernel - Re: [PATCH AUTOSEL 5.10 07/10] ARM: decompressor: Include .data.rel.ro.local

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Message-ID: <20221011114931.GB12851@duo.ucw.cz>
Date:   Tue, 11 Oct 2022 13:49:31 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Kees Cook <keescook@...omium.org>,
        kernel test robot <lkp@...el.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH AUTOSEL 5.10 07/10] ARM: decompressor: Include
 .data.rel.ro.local

Hi!

> From: Kees Cook <keescook@...omium.org>
> 
> [ Upstream commit 1b64daf413acd86c2c13f5443f6b4ef3690c8061 ]
> 
> The .data.rel.ro.local section has the same semantics as .data.rel.ro
> here, so include it in the .rodata section of the decompressor.
> Additionally since the .printk_index section isn't usable outside of
> the core kernel, discard it in the decompressor. Avoids these warnings:
> 
> arm-linux-gnueabi-ld: warning: orphan section `.data.rel.ro.local' from `arch/arm/boot/compressed/fdt_rw.o' being placed in section `.data.rel.ro.local'
> arm-linux-gnueabi-ld: warning: orphan section `.printk_index' from `arch/arm/boot/compressed/fdt_rw.o' being placed in section `.printk_index'
>

There's no printk_index in 5.10. Perhaps this does not need to be
backported?

Best regards,
							Pavel

> +++ b/arch/arm/boot/compressed/vmlinux.lds.S
> @@ -23,6 +23,7 @@ SECTIONS
>      *(.ARM.extab*)
>      *(.note.*)
>      *(.rel.*)
> +    *(.printk_index)
>      /*
>       * Discard any r/w data - this produces a link error if we have any,
>       * which is required for PIC decompression.  Local data generates
> @@ -57,6 +58,7 @@ SECTIONS
>      *(.rodata)
>      *(.rodata.*)
>      *(.data.rel.ro)
> +    *(.data.rel.ro.*)
>    }
>    .piggydata : {
>      *(.piggydata)
> -- 
> 2.35.1

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HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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