David Howells 47f9e4c924 keys: Do not cache key in task struct if key is requested from kernel thread ... The key which gets cached in task structure from a kernel thread does not get invalidated even after expiry. Due to which, a new key request from kernel thread will be served with the cached key if it's present in task struct irrespective of the key validity. The change is to not cache key in task_struct when key requested from kernel thread so that kernel thread gets a valid key on every key request. The problem has been seen with the cifs module doing DNS lookups from a kernel thread and the results getting pinned by being attached to that kernel thread's cache - and thus not something that can be easily got rid of. The cache would ordinarily be cleared by notify-resume, but kernel threads don't do that. This isn't seen with AFS because AFS is doing request_key() within the kernel half of a user thread - which will do notify-resume. Fixes: 7743c48e54 ("keys: Cache result of request_key*() temporarily in task_struct") Signed-off-by: Bharath SM <bharathsm@microsoft.com> Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> cc: Shyam Prasad N <nspmangalore@gmail.com> cc: Steve French <smfrench@gmail.com> cc: keyrings@vger.kernel.org cc: linux-cifs@vger.kernel.org cc: linux-fsdevel@vger.kernel.org Link: https://lore.kernel.org/r/CAGypqWw951d=zYRbdgNR4snUDvJhWL=q3=WOyh7HhSJupjz2vA@mail.gmail.com/		2023-03-21 16:22:40 +00:00
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encrypted-keys
trusted-keys
big_key.c
compat.c
compat_dh.c
dh.c	KEYS: DH: Use crypto_wait_req	2023-02-13 18:34:48 +08:00
gc.c
internal.h
Kconfig
key.c	KEYS: Add new function key_create()	2023-02-13 10:11:20 +02:00
keyctl.c
keyctl_pkey.c
keyring.c
Makefile
permission.c
persistent.c
proc.c
process_keys.c
request_key.c	keys: Do not cache key in task struct if key is requested from kernel thread	2023-03-21 16:22:40 +00:00
request_key_auth.c
sysctl.c
user_defined.c