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Date:   Thu, 7 Oct 2021 08:20:26 +0200
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     "Hans-Christian Egtvedt (hegtvedt)" <hegtvedt@cisco.com>
Cc:     "stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: Re: Stable release 4.4.286 broken for ARM64 with
 CONFIG_CC_STACKPROTECTOR=y
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On Wed, Oct 06, 2021 at 09:20:42PM +0000, Hans-Christian Egtvedt (hegtvedt) wrote:
> Hello,
> 
> latest stable release 4.4.286 does not build for me on ARM64 with 
> CONFIG_CC_STACKPROTECTOR=y.
> 
> The offending commit
> 
> commit 69e450b170995e8a4e3eb94fb14c822553124870
> Author: Dan Li <ashimida@linux.alibaba.com>
> Date:   Tue Sep 14 11:44:02 2021
> 
>      arm64: Mark __stack_chk_guard as __ro_after_init
> 
> The 4.4.y kernel does not have the ro_after_init section defined at all, 
> stable kernel 4.9.y is the first to have it.
> 
> I do not have an overview of this feature, but it appears to have 
> started with commit
> 
> commit c74ba8b3480da6ddaea17df2263ec09b869ac496
> Author: Kees Cook <keescook@chromium.org>
> Date:   Wed Feb 17 23:41:15 2016
> 
>      arch: Introduce post-init read-only memory
> 
> -- 
> Best regards, Hans-Christian Noren Egtvedt.

Thank you for letting me know.  I'll go revert this and do a new release
with this fixed.

greg k-h