[PATCH v3 5/6] powerpc/fsl_booke/64: clear the original kernel if randomized

[Jason Yan]

在 2020/2/20 21:49, Christophe Leroy 写道:
> 
> 
> 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 ?
> 

PPC32 did this in relocate_init() in fsl_booke.c because PPC32 will not 
reach kaslr_early_init for the second pass after relocation.

Thanks,
Jason

> Christophe
> 
>>
>> Signed-off-by: Jason Yan <yanaijie at huawei.com>
>> Cc: Scott Wood <oss at buserror.net>
>> Cc: Diana Craciun <diana.craciun at nxp.com>
>> Cc: Michael Ellerman <mpe at ellerman.id.au>
>> Cc: Christophe Leroy <christophe.leroy at c-s.fr>
>> Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
>> Cc: Paul Mackerras <paulus at samba.org>
>> Cc: Nicholas Piggin <npiggin at gmail.com>
>> Cc: Kees Cook <keescook at 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 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;
>>
> 
> .