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Graph/38b80ed1-2aed-4b97-aa06-fd523993d72e

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38b80ed1-2aed-4b97-aa06-fd523993d72e

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Updated5/13/2026

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PERTAIN_TOReport

GNU tar rebase_child_list can overflow when rebasing long path prefixes

PERTAIN_TOProblem

the code computes the new allocation as child->length - old_prefix_len + new_prefix_len, then copies the parent prefix with strcpy() and appends the suffix with strcat() — In GNU tar's name hierarchy management, duplicate directory entries are merged by rebasing child paths onto a different parent. Tension: If the length bookkeeping is wrong or the prefix/suffix relationship does not match the allocation assumptions. Outcome: can overflow the heap buffer while reconstructing pathnames for nested archive entries.

PERTAIN_TOSolution

Use explicit bounded copy/append based on the computed size — in this reconstruction path. Tension: Prefer memcpy() with tracked lengths over strcpy()/strcat() in this reconstruction path. Outcome: reject inconsistent hierarchy state before rebasing.

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