Re: [PATCH 04/10] util: give fuservicemount3 an absolute build-tree runpath

["Darrick J. Wong" <djwong@kernel.org>]

On Fri, Sep 25, 2026 at 12:23:32AM +0200, Bernd Schubert via B4 Relay wrote:
> From: Bernd Schubert <bernd@bsbernd.com>
> 
> The dynamic loader ignores $ORIGIN runpaths and LD_LIBRARY_PATH for a
> setuid program. A build-tree fuservicemount3 made setuid, for example by
> "run-tests.py --setuid-helpers", then failed with "libfuse3.so.4: cannot
> open shared object file", or loaded the libfuse3.so.4 of the system.
> meson removes build_rpath on install, so installed binaries do not change.

That's a clever trick, I will have to use that. :)

> Assisted-by: LLM
> Signed-off-by: Bernd Schubert <bernd@bsbernd.com>

Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>

--D

> ---
>  util/meson.build | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/util/meson.build b/util/meson.build
> index 28052a65536f..bc266776e153 100644
> --- a/util/meson.build
> +++ b/util/meson.build
> @@ -22,6 +22,8 @@ if private_cfg.get('HAVE_SERVICEMOUNT', false)
>               link_with: [ libfuse ],
>               install: true,
>               install_dir: get_option('sbindir'),
> +             # A setuid run ignores the $ORIGIN runpath meson sets
> +             build_rpath: join_paths(meson.project_build_root(), 'lib'),
>               c_args: ['-DFUSE_USE_VERSION=319'] + mount_service_cflags)
>  endif
>  
> 
> -- 
> 2.53.0
> 
> 
>