linux-kernel - [PATCH v4 5/6] powerpc/fsl_booke/64: clear the original kernel if randomized

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Message-ID: <20200306064033.3398-6-yanaijie@huawei.com>
Date:   Fri, 6 Mar 2020 14:40:32 +0800
From:   Jason Yan <yanaijie@...wei.com>
To:     <mpe@...erman.id.au>, <linuxppc-dev@...ts.ozlabs.org>,
        <diana.craciun@....com>, <christophe.leroy@....fr>,
        <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>,
        <dja@...ens.net>, Jason Yan <yanaijie@...wei.com>
Subject: [PATCH v4 5/6] powerpc/fsl_booke/64: clear the original kernel if randomized

The original kernel still exists in the memory, clear it now.

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 bf60f956dc91..f7ab97aa2127 100644
--- a/arch/powerpc/mm/nohash/kaslr_booke.c
+++ b/arch/powerpc/mm/nohash/kaslr_booke.c
@@ -379,8 +379,10 @@ notrace void __init kaslr_early_init(void *dt_ptr, phys_addr_t size)
 	unsigned long kernel_sz;
 
 	if (IS_ENABLED(CONFIG_PPC64)) {
-		if (__run_at_load == 1)
+		if (__run_at_load == 1) {
+			kaslr_late_init();
 			return;
+		}
 
 		/* Setup flat device-tree pointer */
 		initial_boot_params = dt_ptr;
-- 
2.17.2