On Thu, 28 Sep 2023, Lukas Wunner wrote: > The upcoming support for PCI device authentication with CMA-SPDM > (PCIe r6.1 sec 6.31) requires parsing X.509 certificates upon > device enumeration, which happens in a subsys_initcall(). > > Parsing X.509 certificates accesses the blacklist keyring: > x509_cert_parse() > x509_get_sig_params() > is_hash_blacklisted() > keyring_search() > > So far the keyring is created much later in a device_initcall(). Avoid > a NULL pointer dereference on access to the keyring by creating it one > initcall level earlier than PCI device enumeration, i.e. in an > arch_initcall(). > > Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx> > --- > certs/blacklist.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/certs/blacklist.c b/certs/blacklist.c > index 675dd7a8f07a..34185415d451 100644 > --- a/certs/blacklist.c > +++ b/certs/blacklist.c > @@ -311,7 +311,7 @@ static int restrict_link_for_blacklist(struct key *dest_keyring, > * Initialise the blacklist > * > * The blacklist_init() function is registered as an initcall via > - * device_initcall(). As a result if the blacklist_init() function fails for > + * arch_initcall(). As a result if the blacklist_init() function fails for > * any reason the kernel continues to execute. While cleanly returning -ENODEV > * could be acceptable for some non-critical kernel parts, if the blacklist > * keyring fails to load it defeats the certificate/key based deny list for > @@ -356,7 +356,7 @@ static int __init blacklist_init(void) > /* > * Must be initialised before we try and load the keys into the keyring. > */ > -device_initcall(blacklist_init); > +arch_initcall(blacklist_init); > > #ifdef CONFIG_SYSTEM_REVOCATION_LIST > /* > Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx> -- i.
