path: root/tools/testing
diff options
authorAndy Lutomirski <luto@kernel.org>2017-06-29 08:46:12 -0700
committerShuah Khan <shuahkh@osg.samsung.com>2017-06-30 10:06:24 -0600
commit796a3bae2fba6810427efdb314a1c126c9490fb3 (patch)
tree2564ffe87dc6fbb99b1e71ea805b35277516e738 /tools/testing
parentselftests: intel_pstate: add .gitignore (diff)
selftests/capabilities: Fix the test_execve test
test_execve does rather odd mount manipulations to safely create temporary setuid and setgid executables that aren't visible to the rest of the system. Those executables end up in the test's cwd, but that cwd is MNT_DETACHed. The core namespace code considers MNT_DETACHed trees to belong to no mount namespace at all and, in general, MNT_DETACHed trees are only barely function. This interacted with commit 380cf5ba6b0a ("fs: Treat foreign mounts as nosuid") to cause all MNT_DETACHed trees to act as though they're nosuid, breaking the test. Fix it by just not detaching the tree. It's still in a private mount namespace and is therefore still invisible to the rest of the system (except via /proc, and the same nosuid logic will protect all other programs on the system from believing in test_execve's setuid bits). While we're at it, fix some blatant whitespace problems. Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org> Fixes: 380cf5ba6b0a ("fs: Treat foreign mounts as nosuid") Cc: stable@vger.kernel.org Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Kees Cook <keescook@chromium.org> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Greg KH <greg@kroah.com> Cc: linux-kselftest@vger.kernel.org Signed-off-by: Andy Lutomirski <luto@kernel.org> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Diffstat (limited to 'tools/testing')
1 files changed, 2 insertions, 5 deletions
diff --git a/tools/testing/selftests/capabilities/test_execve.c b/tools/testing/selftests/capabilities/test_execve.c
index 10a21a958aaf..763f37fecfb8 100644
--- a/tools/testing/selftests/capabilities/test_execve.c
+++ b/tools/testing/selftests/capabilities/test_execve.c
@@ -138,9 +138,6 @@ static void chdir_to_tmpfs(void)
if (chdir(cwd) != 0)
err(1, "chdir to private tmpfs");
- if (umount2(".", MNT_DETACH) != 0)
- err(1, "detach private tmpfs");
static void copy_fromat_to(int fromfd, const char *fromname, const char *toname)
@@ -248,7 +245,7 @@ static int do_tests(int uid, const char *our_path)
err(1, "chown");
if (chmod("validate_cap_sgidnonroot", S_ISGID | 0710) != 0)
err(1, "chmod");
+ }
@@ -384,7 +381,7 @@ static int do_tests(int uid, const char *our_path)
} else {
printf("[RUN]\tNon-root +ia, sgidnonroot => i\n");
- false, false, true, false);
+ false, false, true, false);
if (fork_wait()) {
printf("[RUN]\tNon-root +ia, sgidroot => i\n");