On Tue, 2023-10-03 at 11:37 +0300, Ilpo Järvinen wrote: > 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> Reviewed-by: Wilfred Mallawa <wilfred.mallawa@xxxxxxx> >
