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

[linuxtestproject.agent@gmail.com]

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

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