-----BEGIN PGP SIGNATURE-----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=c2FO
-----END PGP SIGNATURE-----
Merge tag 'keys-request-20190626' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
Pull request_key improvements from David Howells:
"These are all request_key()-related, including a fix and some improvements:
- Fix the lack of a Link permission check on a key found by
request_key(), thereby enabling request_key() to link keys that
don't grant this permission to the target keyring (which must still
grant Write permission).
Note that the key must be in the caller's keyrings already to be
found.
- Invalidate used request_key authentication keys rather than
revoking them, so that they get cleaned up immediately rather than
hanging around till the expiry time is passed.
- Move the RCU locks outwards from the keyring search functions so
that a request_key_rcu() can be provided. This can be called in RCU
mode, so it can't sleep and can't upcall - but it can be called
from LOOKUP_RCU pathwalk mode.
- Cache the latest positive result of request_key*() temporarily in
task_struct so that filesystems that make a lot of request_key()
calls during pathwalk can take advantage of it to avoid having to
redo the searching. This requires CONFIG_KEYS_REQUEST_CACHE=y.
It is assumed that the key just found is likely to be used multiple
times in each step in an RCU pathwalk, and is likely to be reused
for the next step too.
Note that the cleanup of the cache is done on TIF_NOTIFY_RESUME,
just before userspace resumes, and on exit"
* tag 'keys-request-20190626' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
keys: Kill off request_key_async{,_with_auxdata}
keys: Cache result of request_key*() temporarily in task_struct
keys: Provide request_key_rcu()
keys: Move the RCU locks outwards from the keyring search functions
keys: Invalidate used request_key authentication keys
keys: Fix request_key() lack of Link perm check on found key
c236b6dd48