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| author |   Lakshmi Ramasubramanian <nramas@linux.microsoft.com> | 2020-06-18 14:10:12 -0700 |
|---|---|---|
| committer |   Mimi Zohar <zohar@linux.ibm.com> | 2020-07-16 21:48:36 -0400 |
| commit | 34e980bb83a07b533d175221436d698c1312c4a3 (patch) | |
| tree | 9acc42a8fcaae2c47ca2b5c92e5832e5e23bf7d0 /security/integrity/ima/ima_main.c | |
| parent | integrity: Add errno field in audit message (diff) | |
| download | linux-dev-34e980bb83a07b533d175221436d698c1312c4a3.tar.xz linux-dev-34e980bb83a07b533d175221436d698c1312c4a3.zip | |
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.c | 18 |
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; } |