[PATCH 4/4] ntdll: Guard against syscall stack overrun.

[Jin-oh Kang]

On Sun, Apr 17, 2022, 3:59 AM Jin-oh Kang <jinoh.kang.kr at gmail.com> wrote:

> On Tue, Apr 12, 2022, 5:59 PM Paul Gofman <pgofman at codeweavers.com> wrote:
>
>> I don’t think this complication worth it. What we would like to save is
>> address space on 32 bit, but we can’t (before running 32 on 64 of course
>> where this stack will be on 64 only). We apparently need to reserve address
>> space for stack at once, so it has the space to grow, and then growing
>> would only mean saving committed pages.
>>
>
> Maybe allocate extra stack only for function calls that might need it?
> Something like this:
> https://docs.microsoft.com/en-us/windows-hardware/drivers/ddi/ntddk/nf-ntddk-keexpandkernelstackandcallout
>

There's also
https://github.com/gcc-mirror/gcc/blob/master/libgcc/config/i386/morestack.S,
which is used by gcc -fsplit-stack, but we might need something more
portable.

>
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