[LTP] [PATCH] ima_tpm.sh: update test2 to detect integrity violations

[LTP] [PATCH] ima_tpm.sh: update test2 to detect integrity violations

[Mimi Zohar]

<securityfs>/integrity/ima/violations reflects the number of
integrity violations.  Include the "--ignore-violations" option,
if there are any violations, on the initial IMA measurement list
verification.

Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
---
 .../security/integrity/ima/tests/ima_tpm.sh   | 20 ++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/testcases/kernel/security/integrity/ima/tests/ima_tpm.sh b/testcases/kernel/security/integrity/ima/tests/ima_tpm.sh
index 5d34d8679..acd8b6d30 100755
--- a/testcases/kernel/security/integrity/ima/tests/ima_tpm.sh
+++ b/testcases/kernel/security/integrity/ima/tests/ima_tpm.sh
@@ -142,6 +142,8 @@ read_pcr_tpm2()
 get_pcr10_aggregate()
 {
 	local cmd="evmctl -vv ima_measurement $BINARY_MEASUREMENTS"
+	local violations="$IMA_DIR/violations"
+	local num_violations=0
 	local msg="$ERRMSG_EVMCTL"
 	local res=TCONF
 	local pcr ret
@@ -151,16 +153,20 @@ get_pcr10_aggregate()
 		res=TFAIL
 	fi
 
-	$cmd > hash.txt 2>&1
-	ret=$?
-	if [ $ret -ne 0 -a -z "$MISSING_EVMCTL" ]; then
-		tst_res TFAIL "evmctl failed, trying with --ignore-violations"
+	if [ ! -f "$violations" ]; then
+		tst_res TINFO "missing $violations"
+	else
+		num_violations=$(cat "$violations")
+	fi
+
+	if [ "$num_violations" -eq 0 ]; then
+		$cmd > hash.txt 2>&1
+		ret=$?
+	else
+		tst_res TINFO "ignoring $num_violations violations"
 		cmd="$cmd --ignore-violations"
 		$cmd > hash.txt 2>&1
 		ret=$?
-	elif [ $ret -ne 0 -a "$MISSING_EVMCTL" = 1 ]; then
-		tst_res TFAIL "evmctl failed $msg"
-		return
 	fi
 
 	[ $ret -ne 0 ] && tst_res TWARN "evmctl failed, trying to continue $msg"
-- 
2.55.0


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Re: [LTP] ima_tpm.sh: update test2 to detect integrity violations

[linuxtestproject.agent]

Hi Mimi,

On Fri, Aug 14, 2026, Mimi Zohar wrote:
> ima_tpm.sh: update test2 to detect integrity violations

> +	if [ "$num_violations" -eq 0 ]; then
> +		$cmd > hash.txt 2>&1
> +		ret=$?
> +	else
> +		tst_res TINFO "ignoring $num_violations violations"
> 		cmd="$cmd --ignore-violations"

Could the failure path of the unflagged invocation retain a retry with
--ignore-violations?

The counter read races with new IMA violations. If another task triggers a
ToMToU or open_writers violation after the counter is read as zero but before
evmctl reads the PCRs, the kernel appends a zero-digest record and extends the
PCR with 0xff. This invocation processes that record without
--ignore-violations, extends zeroes instead, and reports a spurious PCR
mismatch. The removed fallback covered this window.

Verdict - Needs revision

---
Note:

The agent can sometimes produce false positives although often its
findings are genuine. If you find issues with the review, please
comment this email or ignore the suggestions.

Regards,
LTP AI Reviewer

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