ima: Mediate open/release method of the measurements list

ima: Mediate open/release method of the measurements list

Introduce the ima_measure_users counter, to implement a semaphore-like
locking scheme where the binary and ASCII measurements list interfaces can
be concurrently opened by multiple readers, or alternatively by a single
writer. In addition, allow the same writer to open the other interfaces for
write or read/write, so that it can see the same measurement state across
all the interfaces.

A semaphore cannot be used because the kernel cannot return to user space
with a lock held.

Introduce the ima_measure_lock() and ima_measure_unlock() primitives, to
respectively lock/unlock the interfaces (safely with the ima_measure_users
counter, without holding a lock).

Finally, introduce _ima_measurements_open() to lock the interface before
seq_open(), and call it from ima_measurements_open() and
ima_ascii_measurements_open(). And, introduce ima_measurements_release(),
to unlock the interface.

Require CAP_SYS_ADMIN if the interface is opened for write (not possible
for the current measurements interfaces, since they only have read
permission).

No functional changes: multiple readers are allowed as before.

Link: https://github.com/linux-integrity/linux/issues/1
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>