feat: add ReadIMARuntimeMeasurementsCount exported helper#58
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Exposes the IMA runtime measurement count from /sys/kernel/security/ima/runtime_measurements_count. No side effects. Useful for diagnostics and for callers building before/after probes. Co-authored-by: Ona <no-reply@ona.com>
Extract path parameter from readMeasurementCount so tests can supply temp files instead of requiring /sys/kernel/security/ima. Co-authored-by: Ona <no-reply@ona.com>
Covers valid count, zero, whitespace, malformed content, empty file, and missing file. Co-authored-by: Ona <no-reply@ona.com>
This was referenced May 12, 2026
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Added
ReadIMARuntimeMeasurementsCount() (int, error)— exported helper that reads/sys/kernel/security/ima/runtime_measurements_countand returns the current count. No side effects, no caching. Linux-only (same build constraint as the other IMA probes).Motivation
Callers building eBPF/IMA integrations need the raw measurement count to construct their own before/after probes (e.g., "did executing this binary increase the count?"). The existing
probeIMAAnyMeasurementActiveuses this internally but doesn't expose the count. Exporting it gives callers a building block without duplicating the file-read logic.This is the first of three follow-up PRs after #57:
ReadIMARuntimeMeasurementsCountProbeIMAExecMeasurementActive— fresh temp binary, no count>1 shortcutProbeIMAFileCheckMeasurementActive— fresh temp file, same patternDesign notes
SystemFeaturesorformat.goString()output: the count is a point-in-time read, not a cached probe result. Adding it toSystemFeatureswould change the struct's semantics from "snapshot of feature availability" to "snapshot of runtime state".ProbeIMAAnyMeasurementActive(Linux-only exported function, compiles cleanly on other platforms because nothing cross-platform references it).