The TPM PCRs are only reset on a hard reboot.  In order to validate a
TPM's quote after a soft reboot (eg. kexec -e), the IMA measurement list
of the running kernel must be saved and restored on boot.  This patch
restores the measurement list.

Changelog:
- call ima_load_kexec_buffer() (Thiago)

Signed-off-by: Mimi Zohar <redacted>
---
 security/integrity/ima/Makefile       |   1 +
 security/integrity/ima/ima.h          |  10 ++
 security/integrity/ima/ima_init.c     |   2 +
 security/integrity/ima/ima_kexec.c    |  55 +++++++++++
 security/integrity/ima/ima_queue.c    |  10 ++
 security/integrity/ima/ima_template.c | 171 ++++++++++++++++++++++++++++++++++
 6 files changed, 249 insertions(+)
 create mode 100644 security/integrity/ima/ima_kexec.c

diff --git a/security/integrity/ima/Makefile b/security/integrity/ima/Makefile
index c34599f..c0ce7b1 100644
--- a/security/integrity/ima/Makefile
+++ b/security/integrity/ima/Makefile

@@ -8,4 +8,5 @@ obj-$(CONFIG_IMA) += ima.o
 ima-y := ima_fs.o ima_queue.o ima_init.o ima_main.o ima_crypto.o ima_api.o \
 	 ima_policy.o ima_template.o ima_template_lib.o ima_buffer.o
 ima-$(CONFIG_IMA_APPRAISE) += ima_appraise.o
+ima-$(CONFIG_KEXEC_FILE) += ima_kexec.o
 obj-$(CONFIG_IMA_BLACKLIST_KEYRING) += ima_mok.o

diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index b5728da..84e8d36 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h

@@ -102,6 +102,13 @@ struct ima_queue_entry {
 };
 extern struct list_head ima_measurements;	/* list of all measurements */
 
+/* Some details preceding the binary serialized measurement list */
+struct ima_kexec_hdr {
+	unsigned short version;
+	unsigned long buffer_size;
+	unsigned long count;
+} __packed;