On Fri, Feb 02, 2018 at 12:49:38PM +0100, Pablo Neira Ayuso wrote:
[...]
>
> Or place this in the core, something like:
>
> bool net_valid_name(const char *name, size_t len)
> {
> ...
> }
>
> then use it from dev_valid_name()
>
> bool dev_valid_name(const char *name)
> {
> return net_valid_name(name, IFNAMSIZ);
> }
Just to clarify, I think I prefer this approach, probably other
subsystem can benefit from this generic approach too.
BTW, I wonder if we should use strnlen() instead of strlen() in
dev_valid_name(), I guess this not useful for device name since they
are guaranteed to be nul-terminated, but netfilter this would be good
given userspace can send us a non nul-terminated string. But in
general, I think it doesn't harm to use strnlen() in dev_valid_name().
Am I missing anything in all these tricky string handling? Thanks!
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