Static calls invocations aren't well supported from module __init and __exit functions. Especially the static call from cleanup_trusted() led to a crash on x86 kernel with CONFIG_DEBUG_VIRTUAL=y. However, the usage of static call invocations for trusted_key_init() and trusted_key_exit() don't add any value from either a performance or security perspective. Hence switch to use indirect function calls instead. Note here that although it will fix the current crash report, ultimately the static call infrastructure should be fixed to either support its future usage from module __init and __exit functions or not. Reported-by: Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx> Link: https://lore.kernel.org/lkml/ZRhKq6e5nF%2F4ZIV1@fedora/#t Fixes: 5d0682be3189 ("KEYS: trusted: Add generic trusted keys framework") Signed-off-by: Sumit Garg <sumit.garg@xxxxxxxxxx> --- Changes in v2: - Polish commit message as per comments from Mimi security/keys/trusted-keys/trusted_core.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/security/keys/trusted-keys/trusted_core.c b/security/keys/trusted-keys/trusted_core.c index c6fc50d67214..85fb5c22529a 100644 --- a/security/keys/trusted-keys/trusted_core.c +++ b/security/keys/trusted-keys/trusted_core.c @@ -44,13 +44,12 @@ static const struct trusted_key_source trusted_key_sources[] = { #endif }; -DEFINE_STATIC_CALL_NULL(trusted_key_init, *trusted_key_sources[0].ops->init); DEFINE_STATIC_CALL_NULL(trusted_key_seal, *trusted_key_sources[0].ops->seal); DEFINE_STATIC_CALL_NULL(trusted_key_unseal, *trusted_key_sources[0].ops->unseal); DEFINE_STATIC_CALL_NULL(trusted_key_get_random, *trusted_key_sources[0].ops->get_random); -DEFINE_STATIC_CALL_NULL(trusted_key_exit, *trusted_key_sources[0].ops->exit); +static void (*trusted_key_exit)(void); static unsigned char migratable; enum { @@ -359,19 +358,16 @@ static int __init init_trusted(void) if (!get_random) get_random = kernel_get_random; - static_call_update(trusted_key_init, - trusted_key_sources[i].ops->init); static_call_update(trusted_key_seal, trusted_key_sources[i].ops->seal); static_call_update(trusted_key_unseal, trusted_key_sources[i].ops->unseal); static_call_update(trusted_key_get_random, get_random); - static_call_update(trusted_key_exit, - trusted_key_sources[i].ops->exit); + trusted_key_exit = trusted_key_sources[i].ops->exit; migratable = trusted_key_sources[i].ops->migratable; - ret = static_call(trusted_key_init)(); + ret = trusted_key_sources[i].ops->init(); if (!ret) break; } @@ -388,7 +384,8 @@ static int __init init_trusted(void) static void __exit cleanup_trusted(void) { - static_call_cond(trusted_key_exit)(); + if (trusted_key_exit) + (*trusted_key_exit)(); } late_initcall(init_trusted); -- 2.34.1
