run_vmtests.sh runs on-fault-limit as the nobody user via "sudo -u nobody ./on-fault-limit", guarded by a check that nobody can access the binary ("sudo -u nobody ls ./on-fault-limit"). The guard resolves the relative path from the inherited working directory, which only requires search permission on the test directory itself. Classic sudo passes the relative path through to execve() the same way, so the two agree. However, sudo-rs (the default sudo implementation since Ubuntu 25.10) canonicalizes the command to an absolute path before executing it, which requires search permission on every ancestor directory. When the kernel tree lives under a private home directory (mode 0750, the Ubuntu default for new users since 21.04), the guard passes but the execution fails with "command not found", and the test is reported as a false FAIL: # running sudo -u nobody ./on-fault-limit sudo: './on-fault-limit': command not found # [FAIL] Wrap the command in "sh -c" so that sudo only resolves the shell binary, and the relative path is resolved by nobody's shell from the inherited working directory, matching what the guard checks. This is the only "sudo -u nobody" invocation in the script; uid, cwd, rlimits (including RLIMIT_MEMLOCK, which this test exercises) and the exit status are unchanged through sh. Verified on Ubuntu 26.04 (sudo-rs 0.2.13): the test now runs and passes instead of failing. Verified on Ubuntu 24.04 (sudo 1.9.15p5): behavior is unchanged. Fixes: 5d2146a3354f ("selftests/mm: skip mlock tests if nobody user can't read it") Cc: Brendan Jackman Signed-off-by: Injae Ryou --- tools/testing/selftests/mm/run_vmtests.sh | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh index a60b9f9f16e..687d115e3bd 100755 --- a/tools/testing/selftests/mm/run_vmtests.sh +++ b/tools/testing/selftests/mm/run_vmtests.sh @@ -302,7 +302,7 @@ CATEGORY="compaction" run_test ./compaction_test if command -v sudo &> /dev/null && sudo -u nobody ls ./on-fault-limit >/dev/null; then - CATEGORY="mlock" run_test sudo -u nobody ./on-fault-limit + CATEGORY="mlock" run_test sudo -u nobody sh -c ./on-fault-limit else echo "# SKIP ./on-fault-limit" fi -- 2.53.0