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Date: Thu, 20 Feb 2020 14:49:44 +0100
From: Christophe Leroy <christophe.leroy@....fr>
To: Jason Yan <yanaijie@...wei.com>, mpe@...erman.id.au,
linuxppc-dev@...ts.ozlabs.org, diana.craciun@....com,
benh@...nel.crashing.org, paulus@...ba.org, npiggin@...il.com,
keescook@...omium.org, kernel-hardening@...ts.openwall.com, oss@...error.net
Cc: linux-kernel@...r.kernel.org, zhaohongjiang@...wei.com
Subject: Re: [PATCH v3 5/6] powerpc/fsl_booke/64: clear the original kernel if
randomized
Le 06/02/2020 à 03:58, Jason Yan a écrit :
> The original kernel still exists in the memory, clear it now.
No such problem with PPC32 ? Or is that common ?
Christophe
>
> Signed-off-by: Jason Yan <yanaijie@...wei.com>
> Cc: Scott Wood <oss@...error.net>
> Cc: Diana Craciun <diana.craciun@....com>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Christophe Leroy <christophe.leroy@....fr>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Nicholas Piggin <npiggin@...il.com>
> Cc: Kees Cook <keescook@...omium.org>
> ---
> arch/powerpc/mm/nohash/kaslr_booke.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/mm/nohash/kaslr_booke.c b/arch/powerpc/mm/nohash/kaslr_booke.c
> index c6f5c1db1394..ed1277059368 100644
> --- a/arch/powerpc/mm/nohash/kaslr_booke.c
> +++ b/arch/powerpc/mm/nohash/kaslr_booke.c
> @@ -378,8 +378,10 @@ notrace void __init kaslr_early_init(void *dt_ptr, phys_addr_t size)
> unsigned int *__kaslr_offset = (unsigned int *)(KERNELBASE + 0x58);
> unsigned int *__run_at_load = (unsigned int *)(KERNELBASE + 0x5c);
>
> - if (*__run_at_load == 1)
> + if (*__run_at_load == 1) {
> + kaslr_late_init();
> return;
> + }
>
> /* Setup flat device-tree pointer */
> initial_boot_params = dt_ptr;
>
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