[PATCH v2] lib: Use PFN_PHYS() in devmem_is_allowed()
Kefeng Wang
wangkefeng.wang at huawei.com
Tue Aug 3 22:03:01 PDT 2021
On 2021/8/4 8:20, Palmer Dabbelt wrote:
> On Fri, 30 Jul 2021 00:04:05 PDT (-0700), wangkefeng.wang at huawei.com
> wrote:
>>
>> On 2021/7/30 14:49, Liang Wang wrote:
>>> The physical address may exceed 32 bits on ARM(when ARM_LPAE enabled),
>>> use PFN_PHYS() in devmem_is_allowed(), or the physical address may
>>> overflow and be truncated.
>>>
>>> This bug was initially introduced from v2.6.37, and the function was
>>> moved
>>> to lib when v5.10.
>>>
>>> Fixes: 087aaffcdf9c ("ARM: implement CONFIG_STRICT_DEVMEM by
>>> disabling access to RAM via /dev/mem")
>>> Fixes: 527701eda5f1 ("lib: Add a generic version of
>>> devmem_is_allowed()")
>>> Cc: stable at vger.kernel.org # v2.6.37
>>> Signed-off-by: Liang Wang <wangliang101 at huawei.com>
>> Reviewed-by: Kefeng Wang <wangkefeng.wang at huawei.com>
>>> ---
>>> v2: update subject and changelog
>>> lib/devmem_is_allowed.c | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
...
> Acked-by: Palmer Dabbelt <palmerdabbelt at google.com>
>
> I only see the reply so I'm assuming this is going in through some
> other tree, but LMK if you want it via the RISC-V tree as IIRC we're
> using it too.
Hi Palmer, there is a v3 with changelog updated,
https://lore.kernel.org/lkml/20210731025057.78825-1-wangliang101@huawei.com/
>
> Thanks!
> .
>
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