Re: [PATCH RESEND 1/1] um: oops on accessing a non-present page in the vmalloc area

[Petr Tesarik]

On 3/19/2024 11:18 PM, Richard Weinberger wrote:
> ----- Ursprüngliche Mail -----
>> Von: "Petr Tesarik" <petrtesarik@xxxxxxxxxxxxxxx>
>> An: "richard" <richard@xxxxxx>, "anton ivanov" <anton.ivanov@xxxxxxxxxxxxxxxxxx>, "Johannes Berg"
>> <johannes@xxxxxxxxxxxxxxxx>, "linux-um" <linux-um@xxxxxxxxxxxxxxxxxxx>, "linux-kernel" <linux-kernel@xxxxxxxxxxxxxxx>
>> CC: "Roberto Sassu" <roberto.sassu@xxxxxxxxxxxxxxx>, "petr" <petr@xxxxxxxxxxx>
>> Gesendet: Montag, 18. März 2024 14:09:07
>> Betreff: Re: [PATCH RESEND 1/1] um: oops on accessing a non-present page in the vmalloc area
> 
>> On 3/12/2024 4:07 PM, Petr Tesarik wrote:
>>> On 2/23/2024 3:04 PM, Petr Tesarik wrote:
>>>> From: Petr Tesarik <petr.tesarik1@xxxxxxxxxxxxxxxxxxx>
>>>>
>>>> If a segmentation fault is caused by accessing an address in the vmalloc
>>>> area, check that the target page is present.
>>>>
>>>> Currently, if the kernel hits a guard page in the vmalloc area, UML blindly
>>>> assumes that the fault is caused by a stale mapping and will be fixed by
>>>> flush_tlb_kernel_vm(). Unsurprisingly, if the fault is caused by accessing
>>>> a guard page, no mapping is created, and when the faulting instruction is
>>>> restarted, it will cause exactly the same fault again, effectively creating
>>>> an infinite loop.
>>>
>>> Ping. Any comment on this fix?
>>
>> I don't think I have seen a reply from you. If you did comment, then
>> your email has not reached me.
>>
>> Please, can you confirm you have seen my patch?
> 
> Yes. I'm just way behind my maintainer schedule. :-/

Understood. Thank you for your reply.

By the way, are you looking for more people to help with the amount of work?

Petr T