linux-stable

mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2025-01-09 22:50:41 +00:00

History

David Howells cf8304e8f3 KEYS: Fix RCU handling in key_gc_keyring()

key_gc_keyring() needs to either hold the RCU read lock or hold the keyring
semaphore if it's going to scan the keyring's list.  Given that it only needs
to read the key list, and it's doing so under a spinlock, the RCU read lock is
the thing to use.

Furthermore, the RCU check added in e7b0a61b7929632d36cf052d9e2820ef0a9c1bfe is
incorrect as holding the spinlock on key_serial_lock is not grounds for
assuming a keyring's pointer list can be read safely.  Instead, a simple
rcu_dereference() inside of the previously mentioned RCU read lock is what we
want.

Reported-by: Serge E. Hallyn <serue@us.ibm.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Acked-by: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>

2010-05-05 11:39:23 +10:00

compat.c

KEYS: Add a keyctl to install a process's session keyring on its parent [try #6 ]

2009-09-02 21:29:22 +10:00

gc.c

KEYS: Fix RCU handling in key_gc_keyring()

2010-05-05 11:39:23 +10:00

internal.h

KEYS: Add a keyctl to install a process's session keyring on its parent [try #6 ]

2009-09-02 21:29:22 +10:00

key.c

KEYS: Fix garbage collector