linux-hardening - Re: mainline build failure of powerpc allmodconfig for prom_init

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Message-ID: <20220718145601.GE25951@gate.crashing.org>
Date:   Mon, 18 Jul 2022 09:56:01 -0500
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Kees Cook <keescook@...omium.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Paul Mackerras <paulus@...ba.org>,
        linux-hardening@...r.kernel.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: mainline build failure of powerpc allmodconfig for prom_init_check

On Mon, Jul 18, 2022 at 01:52:38PM +1000, Michael Ellerman wrote:
> Segher Boessenkool <segher@...nel.crashing.org> writes:
> > Can't we simply have a small simple implementation of these functions in
> > arch/powerpc/boot/?  This stuff is not performance-critical, and this is
> > not the first time we hit these problems.
> 
> prom_init.c isn't in arch/powerpc/boot :)

Ah duh :-)

> It's linked into the kernel proper, but we want it to behave like a
> pre-boot environment (because not all boot paths run it) which is why we
> restrict what symbols it can call.
> 
> We could have a prom_memset() etc. but we'd need to do some tricks to
> rewrite references to memset() to prom_memset() before linking.

You can do it in its linker script?


Segher