Re: stack overflow in getaddrinfo(3) with a small-sized stack in pthreads

[Joerg Sonnenberger <joerg%bec.de@localhost>]

On Mon, Nov 29, 2021 at 06:31:30PM +0100, Steffen Nurpmeso wrote:
> Joerg Sonnenberger wrote in
>  <YaT9P6a+AlEm3w7h%bec.de@localhost>:
>  |On Mon, Nov 29, 2021 at 08:38:35PM +0700, Robert Elz wrote:
>  |> DNS queries (via UDP) are limited to max 512, as that is what the
>  |> protocol always required, so can be handled by everything (or should be).
>  |
>  |Strictly speaking, it is the minimum MTU every IPv4 implementation is
>  |supposed to allow. IPv6 bumped it to 1280.
> 
> RFC 1035 says
> 
>   2.3.4. Size limits
>   ...
>   UDP messages    512 octets or less
> 
> If no EDNS is in use the answer should be pretty small also.
> Also see RFC 2671, but i have forgotten about all that.

Both are predate IPv6 by ages and don't actually disagree with what I am
saying...

Joerg