[PATCH v2 0/3] IMA: Generalize early boot data measurement

[PATCH v2 0/3] IMA: Generalize early boot data measurement

[Lakshmi Ramasubramanian]

The current implementation of early boot measurement in the IMA
subsystem is very specific to asymmetric keys. It does not handle
early boot measurement of data from other subsystems such as
Linux Security Module (LSM), Device-Mapper, etc. As a result, data
provided by these subsystems during system boot are not measured by IMA.

This patch series makes the early boot key measurement functions generic
such that they can be used to measure any early boot data. The functions
in ima_queue_keys.c are refactored to a new file ima_queue_data.c.
The kernel configuration CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS is renamed to
CONFIG_IMA_QUEUE_EARLY_BOOT_DATA so it can be used for enabling any
early boot data measurement. Since measurement of asymmetric keys is
the first consumer of early boot measurement, this kernel configuration
is enabled if IMA_MEASURE_ASYMMETRIC_KEYS and SYSTEM_TRUSTED_KEYRING are
both enabled.

The IMA hook to measure kernel critical data ima_measure_critical_data()
is updated to utilize early boot measurement support.

This series is based on the following repo/branch:
 repo: https://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git
 branch: next-integrity
 commit d012a7190fc1 ("Linux 5.9-rc2") 

This patch is dependent on the following patch series:
	https://patchwork.kernel.org/patch/11709527/
	https://patchwork.kernel.org/patch/11742047/

Change Log:
  v2:
    => Split the patches to first rename the file and functions,
       and then introduce new arguments, followed by adding queuing
       support in ima_measure_critical_data().

Lakshmi Ramasubramanian (3):
  IMA: Generalize early boot measurement of asymmetric keys
  IMA: Support measurement of generic data during early boot
  IMA: Support early boot measurement of critical data

 security/integrity/ima/Kconfig               |   2 +-
 security/integrity/ima/Makefile              |   2 +-
 security/integrity/ima/ima.h                 |  39 ++--
 security/integrity/ima/ima_asymmetric_keys.c |   7 +-
 security/integrity/ima/ima_init.c            |   2 +-
 security/integrity/ima/ima_main.c            |  10 +
 security/integrity/ima/ima_policy.c          |   2 +-
 security/integrity/ima/ima_queue_data.c      | 191 +++++++++++++++++++
 security/integrity/ima/ima_queue_keys.c      | 175 -----------------
 9 files changed, 232 insertions(+), 198 deletions(-)
 create mode 100644 security/integrity/ima/ima_queue_data.c
 delete mode 100644 security/integrity/ima/ima_queue_keys.c

-- 
2.28.0

[PATCH v2 1/3] IMA: Generalize early boot measurement of asymmetric keys

[Lakshmi Ramasubramanian]

The current implementation of early boot measurement in
the IMA subsystem is very specific to asymmetric keys. It does not
handle early boot measurement of data from other subsystems such as
Linux Security Module (LSM), Device-Mapper, etc. As a result, data
provided by these subsystems during system boot are not measured by IMA.

Update the early boot key measurement functions to handle any early
boot data. Refactor the code from ima_queue_keys.c to a new file
ima_queue_data.c. Rename the kernel configuration
CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS to CONFIG_IMA_QUEUE_EARLY_BOOT_DATA
so it can be used for enabling any early boot data measurement.
Since measurement of asymmetric keys is the first consumer of early
boot measurement, enable this kernel configuration if
IMA_MEASURE_ASYMMETRIC_KEYS and SYSTEM_TRUSTED_KEYRING are both enabled.

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 security/integrity/ima/Kconfig               |   2 +-
 security/integrity/ima/Makefile              |   2 +-
 security/integrity/ima/ima.h                 |  32 ++--
 security/integrity/ima/ima_asymmetric_keys.c |   6 +-
 security/integrity/ima/ima_init.c            |   2 +-
 security/integrity/ima/ima_policy.c          |   2 +-
 security/integrity/ima/ima_queue_data.c      | 179 +++++++++++++++++++
 security/integrity/ima/ima_queue_keys.c      | 175 ------------------
 8 files changed, 202 insertions(+), 198 deletions(-)
 create mode 100644 security/integrity/ima/ima_queue_data.c
 delete mode 100644 security/integrity/ima/ima_queue_keys.c

diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig
index 12e9250c1bec..953314d145bb 100644
--- a/security/integrity/ima/Kconfig
+++ b/security/integrity/ima/Kconfig
@@ -322,7 +322,7 @@ config IMA_MEASURE_ASYMMETRIC_KEYS
 	depends on ASYMMETRIC_PUBLIC_KEY_SUBTYPE=y
 	default y
 
-config IMA_QUEUE_EARLY_BOOT_KEYS
+config IMA_QUEUE_EARLY_BOOT_DATA
 	bool
 	depends on IMA_MEASURE_ASYMMETRIC_KEYS
 	depends on SYSTEM_TRUSTED_KEYRING
diff --git a/security/integrity/ima/Makefile b/security/integrity/ima/Makefile
index 67dabca670e2..6a0f9ef93bf0 100644
--- a/security/integrity/ima/Makefile
+++ b/security/integrity/ima/Makefile
@@ -13,4 +13,4 @@ ima-$(CONFIG_IMA_APPRAISE_MODSIG) += ima_modsig.o
 ima-$(CONFIG_HAVE_IMA_KEXEC) += ima_kexec.o
 ima-$(CONFIG_IMA_BLACKLIST_KEYRING) += ima_mok.o
 ima-$(CONFIG_IMA_MEASURE_ASYMMETRIC_KEYS) += ima_asymmetric_keys.o
-ima-$(CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS) += ima_queue_keys.o
+ima-$(CONFIG_IMA_QUEUE_EARLY_BOOT_DATA) += ima_queue_data.o
\ No newline at end of file
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index ecb0a1e7378f..872a06821c98 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -257,29 +257,29 @@ static inline bool ima_kernel_data_source_is_supported(const char *source)
 	return false;
 }
 
-#ifdef CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS
+#ifdef CONFIG_IMA_QUEUE_EARLY_BOOT_DATA
 /*
- * To track keys that need to be measured.
+ * To track data that need to be measured.
  */
-struct ima_key_entry {
+struct ima_data_entry {
 	struct list_head list;
 	void *payload;
 	size_t payload_len;
-	char *keyring_name;
+	const char *event_name;
 };
-void ima_init_key_queue(void);
-bool ima_should_queue_key(void);
-bool ima_queue_key(struct key *keyring, const void *payload,
-		   size_t payload_len);
-void ima_process_queued_keys(void);
+void ima_init_data_queue(void);
+bool ima_should_queue_data(void);
+bool ima_queue_data(const char *event_name, const void *payload,
+		    size_t payload_len);
+void ima_process_queued_data(void);
 #else
-static inline void ima_init_key_queue(void) {}
-static inline bool ima_should_queue_key(void) { return false; }
-static inline bool ima_queue_key(struct key *keyring,
-				 const void *payload,
-				 size_t payload_len) { return false; }
-static inline void ima_process_queued_keys(void) {}
-#endif /* CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS */
+static inline void ima_init_data_queue(void) {}
+static inline bool ima_should_queue_data(void) { return false; }
+static inline bool ima_queue_data(const char *event_name,
+				  const void *payload,
+				  size_t payload_len) { return false; }
+static inline void ima_process_queued_data(void) {}
+#endif /* CONFIG_IMA_QUEUE_EARLY_BOOT_DATA */
 
 /* LIM API function definitions */
 int ima_get_action(struct inode *inode, const struct cred *cred, u32 secid,
diff --git a/security/integrity/ima/ima_asymmetric_keys.c b/security/integrity/ima/ima_asymmetric_keys.c
index a74095793936..d91fddec5ae8 100644
--- a/security/integrity/ima/ima_asymmetric_keys.c
+++ b/security/integrity/ima/ima_asymmetric_keys.c
@@ -37,9 +37,9 @@ void ima_post_key_create_or_update(struct key *keyring, struct key *key,
 	if (!payload || (payload_len == 0))
 		return;
 
-	if (ima_should_queue_key())
-		queued = ima_queue_key(keyring, payload, payload_len);
-
+	if (ima_should_queue_data())
+		queued = ima_queue_data(keyring->description, payload,
+					payload_len);
 	if (queued)
 		return;
 
diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c
index 4902fe7bd570..892894bf4af3 100644
--- a/security/integrity/ima/ima_init.c
+++ b/security/integrity/ima/ima_init.c
@@ -145,7 +145,7 @@ int __init ima_init(void)
 	if (rc != 0)
 		return rc;
 
-	ima_init_key_queue();
+	ima_init_data_queue();
 
 	return rc;
 }
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 0c5202c1f26e..e536ac528558 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -906,7 +906,7 @@ void ima_update_policy(void)
 	ima_update_policy_flag();
 
 	/* Custom IMA policy has been loaded */
-	ima_process_queued_keys();
+	ima_process_queued_data();
 }
 
 /* Keep the enumeration in sync with the policy_tokens! */
diff --git a/security/integrity/ima/ima_queue_data.c b/security/integrity/ima/ima_queue_data.c
new file mode 100644
index 000000000000..563e26f66180
--- /dev/null
+++ b/security/integrity/ima/ima_queue_data.c
@@ -0,0 +1,179 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Microsoft Corporation
+ *
+ * Author: Lakshmi Ramasubramanian (nramas@linux.microsoft.com)
+ *
+ * File: ima_queue_data.c
+ *       Enables deferred processing of data
+ */
+
+#include <linux/workqueue.h>
+#include "ima.h"
+
+/*
+ * Flag to indicate whether data can be processed
+ * right away or should be queued for processing later.
+ */
+static bool ima_process_data;
+
+/*
+ * To synchronize access to the list of data that need to be measured
+ */
+static DEFINE_MUTEX(ima_data_lock);
+static LIST_HEAD(ima_queued_data);
+
+/*
+ * If custom IMA policy is not loaded then data queued up
+ * for measurement should be freed. This worker is used
+ * for handling this scenario.
+ */
+static long ima_data_queue_timeout = 300000; /* 5 Minutes */
+static void ima_data_handler(struct work_struct *work);
+static DECLARE_DELAYED_WORK(ima_data_delayed_work, ima_data_handler);
+static bool timer_expired;
+
+/*
+ * This worker function frees data that may still be
+ * queued up in case custom IMA policy was not loaded.
+ */
+static void ima_data_handler(struct work_struct *work)
+{
+	timer_expired = true;
+	ima_process_queued_data();
+}
+
+/*
+ * This function sets up a worker to free queued data in case
+ * custom IMA policy was never loaded.
+ */
+void ima_init_data_queue(void)
+{
+	schedule_delayed_work(&ima_data_delayed_work,
+			      msecs_to_jiffies(ima_data_queue_timeout));
+}
+
+static void ima_free_data_entry(struct ima_data_entry *entry)
+{
+	if (!entry)
+		return;
+
+	kvfree(entry->payload);
+	kfree(entry->event_name);
+	kfree(entry);
+}
+
+static void *ima_kvmemdup(const void *src, size_t len)
+{
+	void *p = kvmalloc(len, GFP_KERNEL);
+
+	if (p)
+		memcpy(p, src, len);
+	return p;
+}
+
+static struct ima_data_entry *ima_alloc_data_entry(const char *event_name,
+						   const void *payload,
+						   size_t payload_len)
+{
+	struct ima_data_entry *entry;
+
+	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+	if (!entry)
+		goto out;
+
+	/*
+	 * Payload size may exceed the limit supported by kmalloc.
+	 * So use kvmalloc instead.
+	 */
+	entry->payload = ima_kvmemdup(payload, payload_len);
+	entry->event_name = kstrdup(event_name, GFP_KERNEL);
+	entry->payload_len = payload_len;
+
+	if (!entry->payload || !entry->event_name)
+		goto out;
+
+	INIT_LIST_HEAD(&entry->list);
+	return entry;
+
+out:
+	integrity_audit_message(AUDIT_INTEGRITY_PCR, NULL,
+				event_name, func_measure_str(KEY_CHECK),
+				"ENOMEM", -ENOMEM, 0, -ENOMEM);
+	ima_free_data_entry(entry);
+	return NULL;
+}
+
+bool ima_queue_data(const char *event_name, const void *payload,
+		    size_t payload_len)
+{
+	bool queued = false;
+	struct ima_data_entry *entry;
+
+	entry = ima_alloc_data_entry(event_name, payload, payload_len);
+	if (!entry)
+		return false;
+
+	mutex_lock(&ima_data_lock);
+	if (!ima_process_data) {
+		list_add_tail(&entry->list, &ima_queued_data);
+		queued = true;
+	}
+	mutex_unlock(&ima_data_lock);
+
+	if (!queued)
+		ima_free_data_entry(entry);
+
+	return queued;
+}
+
+/*
+ * ima_process_queued_data() - process data queued for measurement
+ *
+ * This function sets ima_process_data to true and processes queued data.
+ * From here on data will be processed right away (not queued).
+ */
+void ima_process_queued_data(void)
+{
+	struct ima_data_entry *entry, *tmp;
+	bool process = false;
+
+	if (ima_process_data)
+		return;
+
+	/*
+	 * Since ima_process_data is set to true, any new data will be
+	 * processed immediately and not be queued to ima_queued_data list.
+	 * First one setting the ima_process_data flag to true will
+	 * process the queued data.
+	 */
+	mutex_lock(&ima_data_lock);
+	if (!ima_process_data) {
+		ima_process_data = true;
+		process = true;
+	}
+	mutex_unlock(&ima_data_lock);
+
+	if (!process)
+		return;
+
+	if (!timer_expired)
+		cancel_delayed_work_sync(&ima_data_delayed_work);
+
+	list_for_each_entry_safe(entry, tmp, &ima_queued_data, list) {
+		if (!timer_expired)
+			process_buffer_measurement(NULL, entry->payload,
+						   entry->payload_len,
+						   entry->event_name,
+						   KEY_CHECK, 0,
+						   entry->event_name,
+						   false);
+		list_del(&entry->list);
+		ima_free_data_entry(entry);
+	}
+}
+
+inline bool ima_should_queue_data(void)
+{
+	return !ima_process_data;
+}
diff --git a/security/integrity/ima/ima_queue_keys.c b/security/integrity/ima/ima_queue_keys.c
deleted file mode 100644
index c2f2ad34f9b7..000000000000
--- a/security/integrity/ima/ima_queue_keys.c
+++ /dev/null
@@ -1,175 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Copyright (C) 2019 Microsoft Corporation
- *
- * Author: Lakshmi Ramasubramanian (nramas@linux.microsoft.com)
- *
- * File: ima_queue_keys.c
- *       Enables deferred processing of keys
- */
-
-#include <linux/workqueue.h>
-#include <keys/asymmetric-type.h>
-#include "ima.h"
-
-/*
- * Flag to indicate whether a key can be processed
- * right away or should be queued for processing later.
- */
-static bool ima_process_keys;
-
-/*
- * To synchronize access to the list of keys that need to be measured
- */
-static DEFINE_MUTEX(ima_keys_lock);
-static LIST_HEAD(ima_keys);
-
-/*
- * If custom IMA policy is not loaded then keys queued up
- * for measurement should be freed. This worker is used
- * for handling this scenario.
- */
-static long ima_key_queue_timeout = 300000; /* 5 Minutes */
-static void ima_keys_handler(struct work_struct *work);
-static DECLARE_DELAYED_WORK(ima_keys_delayed_work, ima_keys_handler);
-static bool timer_expired;
-
-/*
- * This worker function frees keys that may still be
- * queued up in case custom IMA policy was not loaded.
- */
-static void ima_keys_handler(struct work_struct *work)
-{
-	timer_expired = true;
-	ima_process_queued_keys();
-}
-
-/*
- * This function sets up a worker to free queued keys in case
- * custom IMA policy was never loaded.
- */
-void ima_init_key_queue(void)
-{
-	schedule_delayed_work(&ima_keys_delayed_work,
-			      msecs_to_jiffies(ima_key_queue_timeout));
-}
-
-static void ima_free_key_entry(struct ima_key_entry *entry)
-{
-	if (entry) {
-		kfree(entry->payload);
-		kfree(entry->keyring_name);
-		kfree(entry);
-	}
-}
-
-static struct ima_key_entry *ima_alloc_key_entry(struct key *keyring,
-						 const void *payload,
-						 size_t payload_len)
-{
-	int rc = 0;
-	const char *audit_cause = "ENOMEM";
-	struct ima_key_entry *entry;
-
-	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
-	if (entry) {
-		entry->payload = kmemdup(payload, payload_len, GFP_KERNEL);
-		entry->keyring_name = kstrdup(keyring->description,
-					      GFP_KERNEL);
-		entry->payload_len = payload_len;
-	}
-
-	if ((entry == NULL) || (entry->payload == NULL) ||
-	    (entry->keyring_name == NULL)) {
-		rc = -ENOMEM;
-		goto out;
-	}
-
-	INIT_LIST_HEAD(&entry->list);
-
-out:
-	if (rc) {
-		integrity_audit_message(AUDIT_INTEGRITY_PCR, NULL,
-					keyring->description,
-					func_measure_str(KEY_CHECK),
-					audit_cause, rc, 0, rc);
-		ima_free_key_entry(entry);
-		entry = NULL;
-	}
-
-	return entry;
-}
-
-bool ima_queue_key(struct key *keyring, const void *payload,
-		   size_t payload_len)
-{
-	bool queued = false;
-	struct ima_key_entry *entry;
-
-	entry = ima_alloc_key_entry(keyring, payload, payload_len);
-	if (!entry)
-		return false;
-
-	mutex_lock(&ima_keys_lock);
-	if (!ima_process_keys) {
-		list_add_tail(&entry->list, &ima_keys);
-		queued = true;
-	}
-	mutex_unlock(&ima_keys_lock);
-
-	if (!queued)
-		ima_free_key_entry(entry);
-
-	return queued;
-}
-
-/*
- * ima_process_queued_keys() - process keys queued for measurement
- *
- * This function sets ima_process_keys to true and processes queued keys.
- * From here on keys will be processed right away (not queued).
- */
-void ima_process_queued_keys(void)
-{
-	struct ima_key_entry *entry, *tmp;
-	bool process = false;
-
-	if (ima_process_keys)
-		return;
-
-	/*
-	 * Since ima_process_keys is set to true, any new key will be
-	 * processed immediately and not be queued to ima_keys list.
-	 * First one setting the ima_process_keys flag to true will
-	 * process the queued keys.
-	 */
-	mutex_lock(&ima_keys_lock);
-	if (!ima_process_keys) {
-		ima_process_keys = true;
-		process = true;
-	}
-	mutex_unlock(&ima_keys_lock);
-
-	if (!process)
-		return;
-
-	if (!timer_expired)
-		cancel_delayed_work_sync(&ima_keys_delayed_work);
-
-	list_for_each_entry_safe(entry, tmp, &ima_keys, list) {
-		if (!timer_expired)
-			process_buffer_measurement(NULL, entry->payload,
-						   entry->payload_len,
-						   entry->keyring_name,
-						   KEY_CHECK, 0,
-						   entry->keyring_name,
-						   false);
-		list_del(&entry->list);
-		ima_free_key_entry(entry);
-	}
-}
-
-inline bool ima_should_queue_key(void)
-{
-	return !ima_process_keys;
-}
-- 
2.28.0

[PATCH v2 2/3] IMA: Support measurement of generic data during early boot

[Lakshmi Ramasubramanian]

Early boot measurement of data is currently very specific to key
measurement. To make it generic to handle any early boot data
measurement, additional arguments need to be saved in the queue
for deferred processing. This includes the IMA hook func,
data specific to the given func, and a boolean flag to indicate
whether the given payload needs to be measured or a hash of
the payload needs to be measured.

Add new fields to ima_data_entry struct to pass additional data for
the deferred handling of queued data. Update the queue functions to
handle the new data saved in the ima_data_entry struct.

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 security/integrity/ima/ima.h                 | 11 ++++++--
 security/integrity/ima/ima_asymmetric_keys.c |  3 ++-
 security/integrity/ima/ima_queue_data.c      | 28 ++++++++++++++------
 3 files changed, 31 insertions(+), 11 deletions(-)

diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 872a06821c98..422fe833037d 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -266,18 +266,25 @@ struct ima_data_entry {
 	void *payload;
 	size_t payload_len;
 	const char *event_name;
+	const char *event_data;
+	enum ima_hooks func;
+	bool measure_payload_hash;
 };
 void ima_init_data_queue(void);
 bool ima_should_queue_data(void);
 bool ima_queue_data(const char *event_name, const void *payload,
-		    size_t payload_len);
+		    size_t payload_len, const char *event_data,
+		    enum ima_hooks func, bool measure_payload_hash);
 void ima_process_queued_data(void);
 #else
 static inline void ima_init_data_queue(void) {}
 static inline bool ima_should_queue_data(void) { return false; }
 static inline bool ima_queue_data(const char *event_name,
 				  const void *payload,
-				  size_t payload_len) { return false; }
+				  size_t payload_len,
+				  const char *event_data,
+				  enum ima_hooks func,
+				  bool measure_payload_hash) { return false; }
 static inline void ima_process_queued_data(void) {}
 #endif /* CONFIG_IMA_QUEUE_EARLY_BOOT_DATA */
 
diff --git a/security/integrity/ima/ima_asymmetric_keys.c b/security/integrity/ima/ima_asymmetric_keys.c
index d91fddec5ae8..65423754765f 100644
--- a/security/integrity/ima/ima_asymmetric_keys.c
+++ b/security/integrity/ima/ima_asymmetric_keys.c
@@ -39,7 +39,8 @@ void ima_post_key_create_or_update(struct key *keyring, struct key *key,
 
 	if (ima_should_queue_data())
 		queued = ima_queue_data(keyring->description, payload,
-					payload_len);
+					payload_len, keyring->description,
+					KEY_CHECK, false);
 	if (queued)
 		return;
 
diff --git a/security/integrity/ima/ima_queue_data.c b/security/integrity/ima/ima_queue_data.c
index 563e26f66180..d466ee742377 100644
--- a/security/integrity/ima/ima_queue_data.c
+++ b/security/integrity/ima/ima_queue_data.c
@@ -60,6 +60,7 @@ static void ima_free_data_entry(struct ima_data_entry *entry)
 
 	kvfree(entry->payload);
 	kfree(entry->event_name);
+	kfree(entry->event_data);
 	kfree(entry);
 }
 
@@ -74,7 +75,10 @@ static void *ima_kvmemdup(const void *src, size_t len)
 
 static struct ima_data_entry *ima_alloc_data_entry(const char *event_name,
 						   const void *payload,
-						   size_t payload_len)
+						   size_t payload_len,
+						   const char *event_data,
+						   enum ima_hooks func,
+						   bool measure_payload_hash)
 {
 	struct ima_data_entry *entry;
 
@@ -88,9 +92,15 @@ static struct ima_data_entry *ima_alloc_data_entry(const char *event_name,
 	 */
 	entry->payload = ima_kvmemdup(payload, payload_len);
 	entry->event_name = kstrdup(event_name, GFP_KERNEL);
+	if (event_data)
+		entry->event_data = kstrdup(event_data, GFP_KERNEL);
+
 	entry->payload_len = payload_len;
+	entry->func = func;
+	entry->measure_payload_hash = measure_payload_hash;
 
-	if (!entry->payload || !entry->event_name)
+	if (!entry->payload || !entry->event_name ||
+		(event_data && !entry->event_data))
 		goto out;
 
 	INIT_LIST_HEAD(&entry->list);
@@ -98,19 +108,21 @@ static struct ima_data_entry *ima_alloc_data_entry(const char *event_name,
 
 out:
 	integrity_audit_message(AUDIT_INTEGRITY_PCR, NULL,
-				event_name, func_measure_str(KEY_CHECK),
+				event_name, func_measure_str(func),
 				"ENOMEM", -ENOMEM, 0, -ENOMEM);
 	ima_free_data_entry(entry);
 	return NULL;
 }
 
 bool ima_queue_data(const char *event_name, const void *payload,
-		    size_t payload_len)
+		    size_t payload_len, const char *event_data,
+		    enum ima_hooks func, bool measure_payload_hash)
 {
 	bool queued = false;
 	struct ima_data_entry *entry;
 
-	entry = ima_alloc_data_entry(event_name, payload, payload_len);
+	entry = ima_alloc_data_entry(event_name, payload, payload_len,
+				     event_data, func, measure_payload_hash);
 	if (!entry)
 		return false;
 
@@ -165,9 +177,9 @@ void ima_process_queued_data(void)
 			process_buffer_measurement(NULL, entry->payload,
 						   entry->payload_len,
 						   entry->event_name,
-						   KEY_CHECK, 0,
-						   entry->event_name,
-						   false);
+						   entry->func, 0,
+						   entry->event_data,
+						   entry->measure_payload_hash);
 		list_del(&entry->list);
 		ima_free_data_entry(entry);
 	}
-- 
2.28.0

[PATCH v2 3/3] IMA: Support early boot measurement of critical data

[Lakshmi Ramasubramanian]

The IMA hook, namely ima_measure_critical_data(), to measure kernel
critical data requires a custom IMA policy to be loaded.

Update ima_measure_critical_data() to utilize early boot measurement
support to defer processing data if a custom IMA policy is not yet
loaded.

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 security/integrity/ima/ima_main.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 41be4d1d839e..ce0ef310c575 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -885,12 +885,22 @@ int ima_measure_critical_data(const char *event_name,
 			      const void *buf, int buf_len,
 			      bool measure_buf_hash)
 {
+	bool queued = false;
+
 	if (!event_name || !event_data_source || !buf || !buf_len)
 		return -EINVAL;
 
 	if (!ima_kernel_data_source_is_supported(event_data_source))
 		return -EPERM;
 
+	if (ima_should_queue_data())
+		queued = ima_queue_data(event_name, buf, buf_len,
+					event_data_source, CRITICAL_DATA,
+					measure_buf_hash);
+
+	if (queued)
+		return 0;
+
 	return process_buffer_measurement(NULL, buf, buf_len, event_name,
 					  CRITICAL_DATA, 0, event_data_source,
 					  measure_buf_hash);
-- 
2.28.0