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Fix TSA #2816216: suppress Flawfinder false positive on Cython DIGIT_PAIRS_8 memcpy #2028

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Merged
StellaHuang95 merged 3 commits into from
May 29, 2026
+11 −1
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Fix TSA #2816216: suppress Flawfinder false positive on Cython DIGIT_PAIRS_8 memcpy #2028

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3b6103e
Fix TSA #2816216: suppress Flawfinder false positive on Cython DIGIT_…
StellaHuang95 May 28, 2026
119b671
Merge branch 'main' into stellahuang/tsa-2816216-flawfinder-cython-me…
StellaHuang95 May 28, 2026
272f6e5
Fix SyntaxError: add missing closing paren on DIGIT_PAIRS_8 .replace(…
StellaHuang95 May 28, 2026
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2 changes: 1 addition & 1 deletion src/debugpy/_vendored/pydevd/_pydevd_bundle/pydevd_cython.c
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10 changes: 10 additions & 0 deletions src/debugpy/_vendored/pydevd/setup_pydevd_cython.py
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Original file line number Diff line number Diff line change
Expand Up @@ -177,6 +177,16 @@ def build_extension(dir_name, extension_name, target_pydevd_name, force_cython,
c_file_contents = c_file_contents.replace(r"_pydevd_bundle\\pydevd_cython.pxd", "_pydevd_bundle/pydevd_cython.pxd")
c_file_contents = c_file_contents.replace(r"_pydevd_bundle\\pydevd_cython.pyx", "_pydevd_bundle/pydevd_cython.pyx")

# Suppress Flawfinder false positive (CWE-120) in the Cython 3.x
# CIntToPyUnicode boilerplate (`__Pyx____Pyx_PyUnicode_From_int`): the destination
# `dpos` is a stack buffer of size `sizeof(int)*3+2`, and `dpos -= 2` immediately
# precedes a 2-byte memcpy from the 128-byte constant table `DIGIT_PAIRS_8`
# indexed by `digit_pos * 2` where `digit_pos = abs(remaining % 64)`.
c_file_contents = c_file_contents.replace(
" memcpy(dpos, DIGIT_PAIRS_8 + digit_pos * 2, 2);\n",
" memcpy(dpos, DIGIT_PAIRS_8 + digit_pos * 2, 2); /* Flawfinder: ignore */\n",
)

# Suppress Flawfinder false positive (CWE-120/CWE-20) in the
# Cython 3.x ModuleStateLookup boilerplate (`__Pyx_State_ConvertFromInterpIdAsIndex`):
# `read` is a bounded pointer iterator (not POSIX read()), and the loop is
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