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IMA: Check IMA policy flag

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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>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Lakshmi Ramasubramanian 2019-12-11 08:47:02 -08:00 committed by Mimi Zohar
parent 96c9e1de99
commit c5563bad88
1 changed files with 3 additions and 0 deletions
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3
security/integrity/ima/ima_main.c
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@ -655,6 +655,9 @@ void process_buffer_measurement(const void *buf, int size,
int action = 0; int action = 0;
u32 secid; u32 secid;
if (!ima_policy_flag)
return;
/* /*
* Both LSM hooks and auxilary based buffer measurements are * Both LSM hooks and auxilary based buffer measurements are
* based on policy. To avoid code duplication, differentiate * based on policy. To avoid code duplication, differentiate