Re: [PATCH v3] perf header: Validate build_id filename length to prevent buffer overflow

[Namhyung Kim]

On Fri, 03 Apr 2026 01:04:10 +0900, SeungJu Cheon wrote:
> The build_id parsing functions calculate a filename length from the
> event header size and read directly into a stack buffer of PATH_MAX
> bytes without bounds checking. A malformed perf.data file with a
> crafted header.size can cause the length to be negative or exceed
> PATH_MAX, resulting in a stack buffer overflow.
> 
> Add bounds checking for the filename length in both
> perf_header__read_build_ids() and the ABI quirk variant. Print a
> warning message when invalid length is detected.
> 
> [...]
Applied to perf-tools-next, thanks!

Best regards,
Namhyung