Re: Fix build ID parsing logic in stable trees

[Greg KH <gregkh@linuxfoundation.org>]

On Tue, Nov 05, 2024 at 10:15:04AM +0100, Jiri Olsa wrote:
> On Tue, Nov 05, 2024 at 07:54:48AM +0100, Greg KH wrote:
> > On Mon, Nov 04, 2024 at 06:52:52PM +0100, Jiri Olsa wrote:
> > > hi,
> > > sending fix for buildid parsing that affects only stable trees
> > > after merging upstream fix [1].
> > > 
> > > Upstream then factored out the whole buildid parsing code, so it
> > > does not have the problem.
> > 
> > Why not just take those patches instead?
> 
> I guess we could, but I thought it's too big for stable
> 
> we'd need following 2 changes to fix the issue:
>   de3ec364c3c3 lib/buildid: add single folio-based file reader abstraction
>   60c845b4896b lib/buildid: take into account e_phoff when fetching program headers
> 
> and there's also few other follow ups:
>   5ac9b4e935df lib/buildid: Handle memfd_secret() files in build_id_parse()
>   cdbb44f9a74f lib/buildid: don't limit .note.gnu.build-id to the first page in ELF
>   ad41251c290d lib/buildid: implement sleepable build_id_parse() API
>   45b8fc309654 lib/buildid: rename build_id_parse() into build_id_parse_nofault()
>   4e9d360c4cdf lib/buildid: remove single-page limit for PHDR search
> 
> which I guess are not strictly needed

Can you verify what exact ones are needed here?  We'll be glad to take
them if you can verify that they work properly.

thanks,

greg k-h