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authorMickaël Salaün <mic@linux.microsoft.com>2022-03-22 12:13:23 +0100
committerJarkko Sakkinen <jarkko@kernel.org>2022-05-23 18:47:49 +0300
commit4d99750106adbaecee587232f2589f65170d5ce4 (patch)
tree9284e44c14cdfc59563710ff95247237a6f3f7e5
parent6364d106e0417e00eb5f223d8a90287d1c421ce0 (diff)
certs: Explain the rationale to call panic()
The blacklist_init() function calls panic() for memory allocation errors. This change documents the reason why we don't return -ENODEV. Link: https://lore.kernel.org/r/20220322111323.542184-2-mic@digikod.net Link: https://lore.kernel.org/r/YjeW2r6Wv55Du0bJ@iki.fi Suggested-by: Paul Moore <paul@paul-moore.com> Reviewed-by: Paul Moore <paul@paul-moore.com> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Mickaël Salaün <mic@linux.microsoft.com> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
-rw-r--r--certs/blacklist.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/certs/blacklist.c b/certs/blacklist.c
index 486ce0dd8e9c..25094ea73600 100644
--- a/certs/blacklist.c
+++ b/certs/blacklist.c
@@ -307,6 +307,15 @@ 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
+ * 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
+ * signed modules. If a critical piece of security functionality that users
+ * expect to be present fails to initialize, panic()ing is likely the right
+ * thing to do.
*/
static int __init blacklist_init(void)
{