Re: Support for "pshared" POSIX semaphores

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

On Sat, Feb 02, 2019 at 02:11:47PM -0800, Jason Thorpe wrote:
> Ok, updated patch:
> 
> 	https://patch-diff.githubusercontent.com/raw/thorpej/netbsd-src/pull/5.diff <https://patch-diff.githubusercontent.com/raw/thorpej/netbsd-src/pull/5.diff>
> 
> I went an used a simple hash table with 32 buckets.  Seems good enough for now.  Since the “pshared” IDs are random anyway, I didn’t bother with any exotic hash function — just extract some of the random bits to use as the bucket index.

This seems to allow attaching to random semaphores by just knowing the
right idea. This violates the definition of anonymous semaphores and I
wouldn't be surprised if it creates some nasty security issues...

Joerg