[PATCH v2 3/3] IMA: Support early boot measurement of critical data
From: Lakshmi Ramasubramanian <hidden>
Date: 2020-08-28 16:00:51
Also in:
linux-integrity, lkml, selinux
Subsystem:
extended verification module (evm), integrity measurement architecture (ima), security subsystem, the rest · Maintainers:
Mimi Zohar, Roberto Sassu, Dmitry Kasatkin, Paul Moore, James Morris, "Serge E. Hallyn", Linus Torvalds
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 <redacted> --- 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