[5/6] powerpc/fsl_booke/64: clear the original kernel if randomized
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Message ID 20191115093209.26434-6-yanaijie@huawei.com
State New
Headers show
Series
  • implement KASLR for powerpc/fsl_booke/64
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Commit Message

Jason Yan Nov. 15, 2019, 9:32 a.m. UTC
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(-)

Patch
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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;