linux-kernel - Re: [PATCH] arm64: kernel: Add module symbols _text,

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Message-ID: <20200709110107.GA12046@infradead.org>
Date:   Thu, 9 Jul 2020 12:01:07 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Will Deacon <will@...nel.org>
Cc:     sanggil2.kim@...sung.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: kernel: Add module symbols _text, _etext.

On Thu, Jul 09, 2020 at 10:49:51AM +0100, Will Deacon wrote:
> On Thu, Jul 09, 2020 at 05:23:45PM +0900, sanggil2.kim@...sung.com wrote:
> > From: Sanggil Kim <sanggil2.kim@...sung.com>
> > 
> > We have a solution to protect kernel code section(autually from _text to
> > _etext) by not MMU. In order to do this, we have to know the addresses
> > of _text and _etext at runtime.
> 
> Interesting! Can you post patches so that we can implement this solution
> upstream? Without an in-tree user, we won't be exporting these symbols.

And even with that I'm pretty sure the code doing the 'protection'
should be built-in and not modular..