[PATCH v7 7/9] coredump: validate socket name as it is written

[Christian Brauner]

> > The third strscpy() argument is semantically supposed to be the
> > destination buffer size, not the amount of data to copy. For trivial
> > invocations like here, strscpy() actually allows you to leave out the
> > third argument.
> 
> Eeeeewww, that's really implicit behavior. I can use the destination

Ah, I see the argument is optional. I thought you could pass 0 or
something weird.