From: Jason Yan <yanaijie@huawei.com>
To: <mpe@ellerman.id.au>, <linuxppc-dev@lists.ozlabs.org>,
<diana.craciun@nxp.com>, <christophe.leroy@c-s.fr>,
<benh@kernel.crashing.org>, <paulus@samba.org>,
<npiggin@gmail.com>, <keescook@chromium.org>,
<kernel-hardening@lists.openwall.com>
Cc: oss@buserror.net, linux-kernel@vger.kernel.org,
Jason Yan <yanaijie@huawei.com>
Subject: [PATCH 5/6] powerpc/fsl_booke/64: clear the original kernel if randomized
Date: Fri, 15 Nov 2019 17:32:08 +0800 [thread overview]
Message-ID: <20191115093209.26434-6-yanaijie@huawei.com> (raw)
In-Reply-To: <20191115093209.26434-1-yanaijie@huawei.com>
The original kernel still exists in the memory, clear it now.
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Cc: Scott Wood <oss@buserror.net>
Cc: Diana Craciun <diana.craciun@nxp.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Kees Cook <keescook@chromium.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 513f4616e92a..323fe25e8e08 100644
--- a/arch/powerpc/mm/nohash/kaslr_booke.c
+++ b/arch/powerpc/mm/nohash/kaslr_booke.c
@@ -377,8 +377,10 @@ notrace void __init kaslr_early_init(void *dt_ptr, phys_addr_t size)
#ifdef CONFIG_PPC64
unsigned int *__run_at_load = (unsigned int *)(KERNELBASE + 0x5c);
- if (*__run_at_load == 1)
+ if (*__run_at_load == 1) {
+ kaslr_late_init();
return;
+ }
*__run_at_load = 1;
--
2.17.2
next prev parent reply other threads:[~2019-11-15 9:22 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-15 9:32 [PATCH 0/6] implement KASLR for powerpc/fsl_booke/64 Jason Yan
2019-11-15 9:32 ` [PATCH 1/6] powerpc/fsl_booke/kaslr: refactor kaslr_legal_offset() and kaslr_early_init() Jason Yan
2019-11-15 9:32 ` [PATCH 2/6] powerpc/fsl_booke/64: introduce reloc_kernel_entry() helper Jason Yan
2019-11-15 9:32 ` [PATCH 3/6] powerpc/fsl_booke/64: implement KASLR for fsl_booke64 Jason Yan
2019-11-15 9:32 ` [PATCH 4/6] powerpc/fsl_booke/64: do not clear the BSS for the second pass Jason Yan
2019-11-15 9:32 ` Jason Yan [this message]
2019-11-15 9:32 ` [PATCH 6/6] powerpc/fsl_booke/kaslr: rename kaslr-booke32.rst to kaslr-booke.rst and add 64bit part Jason Yan
2019-11-20 18:51 ` [PATCH 0/6] implement KASLR for powerpc/fsl_booke/64 Kees Cook
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