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authorLakshmi Ramasubramanian <nramas@linux.microsoft.com>2020-06-19 00:10:12 +0300
committerMimi Zohar <zohar@linux.ibm.com>2020-07-17 04:48:36 +0300
commit34e980bb83a07b533d175221436d698c1312c4a3 (patch)
tree9acc42a8fcaae2c47ca2b5c92e5832e5e23bf7d0 /security/integrity/ima/ima_main.c
parent2f845882ecd2f6808f87f387dfa9b03d71a68e01 (diff)
downloadlinux-34e980bb83a07b533d175221436d698c1312c4a3.tar.xz
IMA: Add audit log for failure conditions
process_buffer_measurement() and ima_alloc_key_entry() functions need to log an audit message for auditing integrity measurement failures. Add audit message in these two functions. Remove "pr_devel" log message in process_buffer_measurement(). Sample audit messages: [ 6.303048] audit: type=1804 audit(1592506281.627:2): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=kernel op=measuring_key cause=ENOMEM comm="swapper/0" name=".builtin_trusted_keys" res=0 errno=-12 [ 8.019432] audit: type=1804 audit(1592506283.344:10): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 op=measuring_kexec_cmdline cause=hashing_error comm="systemd" name="kexec-cmdline" res=0 errno=-22 Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com> Suggested-by: Mimi Zohar <zohar@linux.ibm.com> Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Diffstat (limited to 'security/integrity/ima/ima_main.c')
-rw-r--r--security/integrity/ima/ima_main.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index c1583d98c5e5..8351b2fd48e0 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -740,6 +740,7 @@ void process_buffer_measurement(const void *buf, int size,
int pcr, const char *keyring)
{
int ret = 0;
+ const char *audit_cause = "ENOMEM";
struct ima_template_entry *entry = NULL;
struct integrity_iint_cache iint = {};
struct ima_event_data event_data = {.iint = &iint,
@@ -794,21 +795,28 @@ void process_buffer_measurement(const void *buf, int size,
iint.ima_hash->length = hash_digest_size[ima_hash_algo];
ret = ima_calc_buffer_hash(buf, size, iint.ima_hash);
- if (ret < 0)
+ if (ret < 0) {
+ audit_cause = "hashing_error";
goto out;
+ }
ret = ima_alloc_init_template(&event_data, &entry, template);
- if (ret < 0)
+ if (ret < 0) {
+ audit_cause = "alloc_entry";
goto out;
+ }
ret = ima_store_template(entry, violation, NULL, buf, pcr);
-
- if (ret < 0)
+ if (ret < 0) {
+ audit_cause = "store_entry";
ima_free_template_entry(entry);
+ }
out:
if (ret < 0)
- pr_devel("%s: failed, result: %d\n", __func__, ret);
+ integrity_audit_message(AUDIT_INTEGRITY_PCR, NULL, eventname,
+ func_measure_str(func),
+ audit_cause, ret, 0, ret);
return;
}