> This is why in SVr4, struct cred is cloned at open time, and passed
> down to each VFS operation.
That doesn't work for shared mappings over holes. Unfortunately.
Yes, credentials cache a-la 4.4BSD would help in many cases, but
we have no reasonably credentials when kswapd writes a dirty page
on disk. It _can_ cause allocations. And many processes might've
touched that page until it finally got written out - which credentials
would you use?
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