Hi Tyler, On Tue, 2020-08-11 at 14:26 -0500, Tyler Hicks wrote: > v2: > - Always return an ERR_PTR from ima_alloc_rule_opt_list() (Nayna) > - Add Lakshmi's Reviewed-by to both patches > - Rebased on commit 3db0d0c276a7 ("integrity: remove redundant > initialization of variable ret") of next-integrity > v1: https://lore.kernel.org/lkml/20200727140831.64251-1-tyhicks@xxxxxxxxxxxxxxxxxxx/ > > Nayna pointed out that the "keyrings=" option in an IMA policy rule > should only be accepted when CONFIG_IMA_MEASURE_ASYMMETRIC_KEYS is > enabled: > > https://lore.kernel.org/linux-integrity/336cc947-1f70-0286-6506-6df3d1d23a1d@xxxxxxxxxxxxxxxxxx/ > > While fixing this, the compiler warned me about the potential for the > ima_keyrings pointer to be NULL despite it being used, without a check > for NULL, as the destination address for the strcpy() in > ima_match_keyring(). > > It also became apparent that there was not adequate locking around the > use of the pre-allocated buffer that ima_keyrings points to. The kernel > keyring has a lock (.sem member of struct key) that ensures only one key > can be added to a given keyring at a time but there's no protection > against adding multiple keys to different keyrings at the same time. > > The first patch in this series fixes both ima_keyrings related issues by > parsing the list of keyrings in a KEY_CHECK rule at policy load time > rather than deferring the parsing to policy check time. Once that fix is > in place, the second patch can enforce that > CONFIG_IMA_MEASURE_ASYMMETRIC_KEYS must be enabled in order to use > "func=KEY_CHECK" or "keyrings=" options in IMA policy. Thank you for fixing and cleaning up the existing keyring policy support. > > The new "keyrings=" value handling is done in a generic manner that can > be reused by other options in the future. This seems to make sense as > "appraise_type=" has similar style (though it doesn't need to be fully > parsed at this time) and using "|" as an alternation delimiter is > becoming the norm in IMA policy. Yes, thank you. Better extending existing key value pairs than defining new boot command line options. This patch set is now queued in next-integrity-testing. Mimi