[PATCH v3 05/15] util: give fuservicemount3 an absolute build-tree runpath

[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.

Assisted-by: LLM
Signed-off-by: Bernd Schubert <bernd@bsbernd.com>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
---
 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