linux-kernel - [PATCH] KEYS: trusted: fix crash when TPM/TEE are built as module

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Date:   Fri,  4 Feb 2022 12:03:42 -0800
From:   Tong Zhang <ztong0001@...il.com>
To:     James Bottomley <jejb@...ux.ibm.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        David Howells <dhowells@...hat.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Sumit Garg <sumit.garg@...aro.org>,
        linux-integrity@...r.kernel.org, keyrings@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Tong Zhang <ztong0001@...il.com>
Subject: [PATCH] KEYS: trusted: fix crash when TPM/TEE are built as module

when TCG_TPM and TEE are built as module, trusted_key_sources will be an
empty array, loading it won't do what it is supposed to do and unloading
it will cause kernel crash.

To reproduce:
$ modprobe trusted
$ modprobe -r trusted

[  173.749423] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[  173.755268] Backtrace:
[  173.755378]  cleanup_trusted [trusted] from sys_delete_module+0x15c/0x22c
[  173.755589]  sys_delete_module from ret_fast_syscall+0x0/0x1c

To fix this issue, we also need to check CONFIG_TCG_TPM_MODULE and
CONFIG_TEE_MODULE.

Fixes: 5d0682be3189 ("KEYS: trusted: Add generic trusted keys framework")
Signed-off-by: Tong Zhang <ztong0001@...il.com>
---
 security/keys/trusted-keys/trusted_core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/security/keys/trusted-keys/trusted_core.c b/security/keys/trusted-keys/trusted_core.c
index d5c891d8d353..b3a3b2f2d4a4 100644
--- a/security/keys/trusted-keys/trusted_core.c
+++ b/security/keys/trusted-keys/trusted_core.c
@@ -27,10 +27,10 @@ module_param_named(source, trusted_key_source, charp, 0);
 MODULE_PARM_DESC(source, "Select trusted keys source (tpm or tee)");
 
 static const struct trusted_key_source trusted_key_sources[] = {
-#if defined(CONFIG_TCG_TPM)
+#if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
 	{ "tpm", &trusted_key_tpm_ops },
 #endif
-#if defined(CONFIG_TEE)
+#if defined(CONFIG_TEE) || defined(CONFIG_TEE_MODULE)
 	{ "tee", &trusted_key_tee_ops },
 #endif
 };
-- 
2.25.1