On 2/19/21 1:23 PM, Lorenz Bauer wrote:

On Fri, 19 Feb 2021 at 11:49, Eric Dumazet [off-list ref] wrote:

quoted

quoted

+     case SO_NETNS_COOKIE:
+             lv = sizeof(u64);
+             if (len < lv)
+                     return -EINVAL;

        if (len != lv)
                return -EINVAL;

(There is no reason to support bigger value before at least hundred years)

Sorry that was copy pasta from SO_COOKIE which uses the same check. I'll
change it to your suggestion. Want me to fix SO_COOKIE as well?

Unfortunately it is too late for SO_COOKIE

Some applications might use len = 256, and just look at what the kernel
gives back.

Better be strict at the time a feature is added, instead of having
to maintain legacy stuff.