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Subject: Re: [PATCH v10 08/10] powerpc/configs: Enable STRICT_MODULE_RWX in
 skiroot_defconfig
To: Jordan Niethe <jniethe5@gmail.com>, linuxppc-dev@lists.ozlabs.org
References: <20210330045132.722243-1-jniethe5@gmail.com>
 <20210330045132.722243-9-jniethe5@gmail.com>
From: Christophe Leroy <christophe.leroy@csgroup.eu>
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Date: Tue, 30 Mar 2021 07:27:13 +0200
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Cc: ajd@linux.ibm.com, Joel Stanley <joel@joel.id.au>, npiggin@gmail.com,
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Le 30/03/2021 à 06:51, Jordan Niethe a écrit :
> From: Russell Currey <ruscur@russell.cc>
> 
> skiroot_defconfig is the only powerpc defconfig with STRICT_KERNEL_RWX
> enabled, and if you want memory protection for kernel text you'd want it
> for modules too, so enable STRICT_MODULE_RWX there.

Maybe we could now selectt ARCH_OPTIONAL_KERNEL_RWX_DEFAULT in arch/powerpc/Kconfig.

Then this change would not be necessary.

Would be in line with https://github.com/linuxppc/issues/issues/223


> 
> Acked-by: Joel Stanley <joel@joel.id.au>
> Signed-off-by: Russell Currey <ruscur@russell.cc>
> Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
> ---
>   arch/powerpc/configs/skiroot_defconfig | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/arch/powerpc/configs/skiroot_defconfig b/arch/powerpc/configs/skiroot_defconfig
> index b806a5d3a695..50fe06cb3a31 100644
> --- a/arch/powerpc/configs/skiroot_defconfig
> +++ b/arch/powerpc/configs/skiroot_defconfig
> @@ -50,6 +50,7 @@ CONFIG_CMDLINE="console=tty0 console=hvc0 ipr.fast_reboot=1 quiet"
>   # CONFIG_PPC_MEM_KEYS is not set
>   CONFIG_JUMP_LABEL=y
>   CONFIG_STRICT_KERNEL_RWX=y
> +CONFIG_STRICT_MODULE_RWX=y
>   CONFIG_MODULES=y
>   CONFIG_MODULE_UNLOAD=y
>   CONFIG_MODULE_SIG_FORCE=y
>