Re: [PATCHES perf-tools-next v2 00/13] Sanity check perf.data headers

[Namhyung Kim]

Hi Arnaldo,

On Fri, Apr 10, 2026 at 07:08:52PM -0300, Arnaldo Carvalho de Melo wrote:
> Hi,
> 
>         Sashiko recently mentioned the lack of sanity checking headers
> in perf.data files, that with a fuzzy or maliciously crafted file could
> make processing a perf.data file cause deleterious results.
> 
>         Add sanity checks and some arbitrarily generous upper limits to
> headers, if some are found to be questionable, lets tweak them in
> upcoming versions of this patchset.

Yep, I think it's a bit tricky to handle malformed files.  But this
change would defend some of bad inputs.  We can add more later.

> 
>         As registered in the Assisted-by tags in the patches, this was
> done using Claude code to speed up development, hopefully no
> hallucinations are present.

It looks fine.

> 
>         I'm also trying to get some of these checks into review-prompts
> skills, some of which were already merged, for instance:
> 
>   https://github.com/masoncl/review-prompts/commit/2bb2159893ea926e120105416e95629b9ef1508c

Thanks for doing this!
Namhyung