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Graph/8e8091a6-2038-4d7d-a47c-32bf96473f4d

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Buffer Management

8e8091a6-2038-4d7d-a47c-32bf96473f4d

Buffer Management

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Updated5/2/2026

PageRank0.0000

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PERTAIN_TOReport

CVE-2023-6779: glibc __vsyslog_internal heap overflow via secondary buffer expansion

PERTAIN_TORootCause

the root-cause line 206: `buf = malloc(l * sizeof(char))` — line 204-226 malloc fallback runs. Tension: allocates only header size, ignoring vl. Outcome: Compared against upstream glibc 2.39 patch which allocates `(l + vl + 1) * sizeof(char)`.

PERTAIN_TOSolution

Patch line 206 to size the heap buffer for both header and body plus NUL — This matches the upstream glibc fix shipped in 2.39. Tension: the full formatted message lives in the heap buffer. Outcome: Set `bufsize = l + vl`.

PERTAIN_TOProblem

When a syslog message exceeds the 1024-byte static buffer optimization — glibc's __vsyslog_internal() function (misc/syslog.c). Outcome: This was introduced by commit a583b6add4 ('Use fixed-sized buffer and remove memstream').

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