On Fri, 2021-07-23 at 10:53 +0200, Roberto Sassu wrote: > Buffer measurements, unlike file measurements, are not accessible after the > measurement is done, as buffers are not suitable for use with the > integrity_iint_cache structure (there is no index, for files it is the > inode number). In the subsequent patches, the measurement (digest) will be > returned directly by the functions that perform the buffer measurement, > ima_measure_critical_data() and process_buffer_measurement(). > > A caller of those functions also needs to know the algorithm used to > calculate the digest. Instead of adding the algorithm as a new parameter to > the functions, this patch provides it separately with the new function > ima_get_current_hash_algo(). > > Since the hash algorithm does not change after the IMA setup phase, there > is no risk of races (obtaining a digest calculated with a different > algorithm than the one returned). Perfect explaination for annotating ima_hash_algo like: int __ro_after_init ima_hash_algo = HASH_ALGO_SHA1; Assuming you don't object, I'll include this change in this patch. thanks, Mimi > > Signed-off-by: Roberto Sassu <roberto.sassu@xxxxxxxxxx> > Reviewed-by: Lakshmi Ramasubramanian <nramas@xxxxxxxxxxxxxxxxxxx>
