RFC PATCH: Don't use /proc/self/maps to calculate size of initial thread stack

[Zack Weinberg]

On Tue, Sep 20, 2022, at 8:16 AM, Florian Weimer via Libc-alpha wrote:
>>> Maybe we can get the kernel to pass the end of the stack in the
>>> auxiliary vector?
>>
>> Sure, but then what do we do on older kernels?  I'm reluctant to say
>> "keep the old code" because we know this is breaking for people right
>> now (although honestly "mount /proc earlier" isn't a terrible
>> suggestion for a workaround).
>
> We can keep doing what we are doing on older kernels.  I don't think we
> should add yet another fallback path for this in case /proc isn't
> available and the kernel doesn't provide the (future) AT_* entry.  *Two*
> fallback paths instead of one seems a bit over the top.

Fair enough.  I have no experience writing kernel patches, do you know anyone who can make the additional AT entry happen?

zw