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Title: cpp: Add 'cpp/mmio-unsanitized-memcpy' query by Tito0015 · Pull Request #22438 · github/codeql · GitHub

Open Graph Title: cpp: Add 'cpp/mmio-unsanitized-memcpy' query by Tito0015 · Pull Request #22438 · github/codeql

X Title: cpp: Add 'cpp/mmio-unsanitized-memcpy' query by Tito0015 · Pull Request #22438 · github/codeql

Description: Summary Adds a new security query cpp/mmio-unsanitized-memcpy targeting unsanitized memory copy operations (memcpy, memmove, strncpy) where size parameters derive directly from hardware registers (MMIO/DMA) without relational bounds checks. Motivation & Domain Context Standard buffer overflow queries (UnboundedWrite.ql, OverrunWrite.ql) model user-space strings and generic memory ops, but do not model volatile register macro reads (READ_REG, GET_MMIO) commonly found in microcontroller drivers, RTOS kernels, and embedded hardware stacks. This query fills a gap for embedded C/C++ static analysis. Query Design & Architecture Taint Engine: Modern DataFlow::ConfigSig with TaintTracking::Global. Sources: Volatile variables, volatile struct fields, volatile pointer dereferences, and MMIO macros (READ_REG, GET_MMIO, REG_READ, DMA_READ). Sinks: Parameter index 2 (size/count) of memcpy, memmove, strncpy, wmemcpy, wmemmove. Barriers: Public IRGuards via DataFlow::BarrierGuard to recognize if (len <= MAX) conditions and prevent false positives. lessThanOrEqual uses the public Operand + getConvertedResultExpression() pattern. Public API Compliance: Uses only public APIs (cpp, TaintTracking, IRGuards). Zero internal. / DataFlowImplCommon dependencies. Verification & Test Results Test Command: codeql test run cpp/ql/test/query-tests/Security/CWE/CWE-120/MmioUnsanitizedMemcpy/ Result: All 1 tests passed (3 positive alerts, 3 false-positive barrier test cases clean). Documentation: codeql generate query-help passed DTD verification and rendered clean markdown. Suite Integration: Explicit include of cpp/mmio-unsanitized-memcpy in cpp-security-extended.qls. Checklist Query metadata follows upstream style guidelines (@kind path-problem, @precision medium, @security-severity 8.6). .qhelp file provided with valid DTD structure and Bad/Good examples. Test directory contains .qlref, test.c, and verified .expected output. Query added to appropriate .qls suite. No internal. module imports used.

Open Graph Description: Summary Adds a new security query cpp/mmio-unsanitized-memcpy targeting unsanitized memory copy operations (memcpy, memmove, strncpy) where size parameters derive directly from hardware registers (...

X Description: Summary Adds a new security query cpp/mmio-unsanitized-memcpy targeting unsanitized memory copy operations (memcpy, memmove, strncpy) where size parameters derive directly from hardware registers (...

Opengraph URL: https://github.com/github/codeql/pull/22438

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b681bc4 cpp: Add 'cpp/mmio-unsanitized-memcpy' query Tito0015 Aug 27, 2026 https://github.com/github/codeql/pull/22438/commits/b681bc4eb222b6fbd6a157b45ae0121588654bde
e20ec33 cpp: Add change note for mmio-unsanitized-memcpy query Tito0015 Aug 31, 2026 https://github.com/github/codeql/pull/22438/commits/e20ec33e48cf9034a78aba1e2395399a7be33ba4
30544e8 cpp: Move mmio-unsanitized-memcpy to experimental Tito0015 Sep 2, 2026 https://github.com/github/codeql/pull/22438/commits/30544e867ba88a54dd32746cb95a13e22ec51048
56c5f3a cpp: Drop experimental query id prefix and change note Tito0015 Sep 3, 2026 https://github.com/github/codeql/pull/22438/commits/56c5f3ab14b129ed32b604679b3ba900834436ef
5d6e2d4 cpp: fix alert location and update integration test expectations Tito0015 Sep 4, 2026 https://github.com/github/codeql/pull/22438/commits/5d6e2d421c665353cbf2a36fd66174075ce90871
ff2416b cpp: remove non-ASCII character in test file Tito0015 Sep 4, 2026 https://github.com/github/codeql/pull/22438/commits/ff2416b0bf8228ff4eb656f24b64f05fc7c697d1
e41e090 cpp: address review nits on qhelp references and test header Tito0015 Sep 17, 2026 https://github.com/github/codeql/pull/22438/commits/e41e0908f44029cb250c22b04d259fab442157a9
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