[PATCH] KEYS: prevent creating a different user's keyrings

Eric Biggers [off-list ref] wrote:

Fix it by marking user and user session keyrings with a flag
KEY_FLAG_UID_KEYRING.  Then, when searching for a user or user session
keyring by name, skip all keyrings that don't have the flag set.

I wonder if it's better just to reject attempts to manually create/join
keyrings of such names.  PAM uses the implicit creation method of specifying
the 'macro' key IDs for these keyrings.

David
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