[PATCH 3/3] getcwd: Set errno to ERANGE for size == 1 (CVE-2021-3999)

[Siddhesh Poyarekar]

On 18/01/2022 19:29, Adhemerval Zanella via Libc-alpha wrote:
> 
> Shouldn't we fix it on posix generic implementation then?
> 

I added the shortcircuit in the generic as well as linux 
implementations.  Should I only restrict it to the posix one? 
Technically the posix implementation is the only one that writes beyond 
buffer bounds, but the linux target is the only one that has the 
reproducer due to the linux-specific features used to get the 
underflow+overflow going.

Thanks,
Siddhesh