[PATCH v2 3/3] ARM: Support KFENCE for ARM
Kefeng Wang
wangkefeng.wang at huawei.com
Wed Nov 3 18:14:17 PDT 2021
On 2021/11/4 0:22, Alexander Potapenko wrote:
> On Wed, Nov 3, 2021 at 2:26 PM Kefeng Wang <wangkefeng.wang at huawei.com> wrote:
>>
>> Add architecture specific implementation details for KFENCE and enable
>> KFENCE on ARM. In particular, this implements the required interface in
>> <asm/kfence.h>.
>>
>> KFENCE requires that attributes for pages from its memory pool can
>> individually be set. Therefore, force the kfence pool to be mapped
>> at page granularity.
>>
>> Testing this patch using the testcases in kfence_test.c and all passed
>> with or without ARM_LPAE.
>>
>> Signed-off-by: Kefeng Wang <wangkefeng.wang at huawei.com>
...
>> diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
>> index f7ab6dabe89f..49148b675b43 100644
>> --- a/arch/arm/mm/fault.c
>> +++ b/arch/arm/mm/fault.c
>> @@ -17,6 +17,7 @@
>> #include <linux/sched/debug.h>
>> #include <linux/highmem.h>
>> #include <linux/perf_event.h>
>> +#include <linux/kfence.h>
>>
>> #include <asm/system_misc.h>
>> #include <asm/system_info.h>
>> @@ -99,6 +100,11 @@ void show_pte(const char *lvl, struct mm_struct *mm, unsigned long addr)
>> { }
>> #endif /* CONFIG_MMU */
>>
>> +static inline bool is_write_fault(unsigned int fsr)
>> +{
>> + return (fsr & FSR_WRITE) && !(fsr & FSR_CM);
>> +}
>
> Please don't increase the diff by moving the code around. Consider
> putting is_write_fault() in the right place in "ARM: mm: Provide
> is_write_fault()" instead.
Sure. Let's wait some time to see whether there are any other comments,
and resend, thanks.
> .
>
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