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Message-ID: <b0a37773-5e5e-daf9-a6bd-2768476119ed@gmail.com>
Date: Fri, 24 Feb 2023 11:07:47 +0100
From: Matthias Brugger <matthias.bgg@...il.com>
To: "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
Weichen Chen <weichen.chen@...iatek.com>,
linux-hardening@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, yt.shen@...iatek.com,
angelogioacchino.delregno@...labora.com, tony.luck@...el.com,
keescook@...omium.org, darren.chen@...iatek.com
Subject: Re: [PATCH v1 1/1] pstore/ram: Fix crash when setting number of cpus
to an odd number
On 24/02/2023 05:00, Guilherme G. Piccoli wrote:
> On 23/02/2023 23:36, Weichen Chen wrote:
>> When the number of cpu cores is adjusted to 7 or other odd numbers,
>> the zone size will become an odd number.
>> The address of the zone will become:
>> addr of zone0 = BASE
>> addr of zone1 = BASE + zone_size
>> addr of zone2 = BASE + zone_size*2
>> ...
>> The address of zone1/3/5/7 will be mapped to non-alignment va.
>> Eventually crashes will occur when accessing these va.
>>
>> So, use ALIGN_DOWN() to make sure the zone size is even
>> to avoid this bug.
>>
>> Signed-off-by: Weichen Chen <weichen.chen@...iatek.com>
>> ---
>> fs/pstore/ram.c | 1 +
>> 1 file changed, 1 insertion(+)
>>
>> diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
>> index ade66dbe5f39..fc57ac97e506 100644
>> --- a/fs/pstore/ram.c
>> +++ b/fs/pstore/ram.c
>> @@ -528,6 +528,7 @@ static int ramoops_init_przs(const char *name,
>> }
>>
>> zone_sz = mem_sz / *cnt;
>> + zone_sz = ALIGN_DOWN(zone_sz, 2);
>> if (!zone_sz) {
>> dev_err(dev, "%s zone size == 0\n", name);
>> goto fail;
>
> Thanks for resending! Feel free to add my:
>
> Tested-by: Guilherme G. Piccoli <gpiccoli@...lia.com>
>
Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>
I gave that yesterday, but Weichen Chen seems to have forgotten about it.
Regards,
Matthias
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