[PATCH] cifs: Support for an upcall to map SID to an uid and a gid

Richard Sharpe realrichardsharpe at gmail.com
Sat Dec 11 17:57:11 MST 2010

On Sat, Dec 11, 2010 at 7:30 PM, Jeff Layton <jlayton at samba.org> wrote:
>> Will look into this.  One thing that concerns me is if a cached etnry
>> for a SID with its name and an id (either an uid or a gid), if that SID
>> now represents a different object and has differernt name, would
>> not cached info be incorrect?  Not sure if this can ever happen
>> or how would it happen and if it does, what would be a trigger
>> for a cache revalidation and purges!
> Sure, mappings can change. But, you still have the same problem with
> what you're proposing in these patches. The userspace program isn't
> setting a timeout on the key. Once a mapping is put in the keyring,
> it's there until it's revoked. You probably want to set a max TTL for
> the entries in the cache regardless of what scheme is used.

I was under the impression that SIDs are never reused. Perhaps I am mistaken.

Richard Sharpe

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