[PATCH v11 1/6] IMA: Check IMA policy flag

Lakshmi Ramasubramanian
2019-12-11T16:47:21Z

process_buffer_measurement() may be called prior to IMA being
initialized (for instance, when the IMA hook is called when
a key is added to the .builtin_trusted_keys keyring), which
would result in a kernel panic.

This patch adds the check in process_buffer_measurement()
to return immediately if IMA is not initialized yet.

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
security/integrity/ima/ima_main.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index d7e987baf127..9b35db2fc777 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -655,6 +655,9 @@ void process_buffer_measurement(const void *buf, int size,
int action = 0;
u32 secid;

+ if (!ima_policy_flag)
+ return;
+
/*
* Both LSM hooks and auxilary based buffer measurements are
* based on policy. To avoid code duplication, differentiate
--
2.17.1