cat /proc/cmdline

BOOT_IMAGE=/vmlinuz-6.1.0-next-20221116 
root=UUID=a65b3a79-dc02-4728-8a0c-5cf24f4ae08b ro 
systemd.unified_cgroup_hierarchy=1 cgroup_no_v1=all


On 2022/11/29 19:03, Mickaël Salaün wrote:

I tested with next-20221116 and all tests are OK. Could you share your 
kernel configuration with a link? What is the content of /proc/cmdline?

On 29/11/2022 02:42, limin wrote:

quoted

I run test on Linux ubuntu2204 6.1.0-next-20221116

I did't use yama.

you can reproduce by this step:

cd kernel_src

cd tools/testing/selftests/landlock/
make
./ptrace_test




On 2022/11/29 3:44, Mickaël Salaün wrote:

quoted

This patch changes the test semantic and then cannot work on my test
environment. On which kernel did you run test? Do you use Yama or
something similar?

On 28/11/2022 03:04, limin wrote:

quoted

Tests PTRACE_ATTACH and PTRACE_MODE_READ on the parent,
trace parent return -1 when child== 0
How to reproduce warning:
$ make -C tools/testing/selftests TARGETS=landlock run_tests

Signed-off-by: limin <redacted>
---
   tools/testing/selftests/landlock/ptrace_test.c | 5 ++---
   1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/landlock/ptrace_test.c

b/tools/testing/selftests/landlock/ptrace_test.c
index c28ef98ff3ac..88c4dc63eea0 100644

--- a/tools/testing/selftests/landlock/ptrace_test.c
+++ b/tools/testing/selftests/landlock/ptrace_test.c

@@ -267,12 +267,11 @@ TEST_F(hierarchy, trace)

           /* Tests PTRACE_ATTACH and PTRACE_MODE_READ on the 
parent. */
           err_proc_read = test_ptrace_read(parent);
           ret = ptrace(PTRACE_ATTACH, parent, NULL, 0);
+        EXPECT_EQ(-1, ret);
+        EXPECT_EQ(EPERM, errno);
           if (variant->domain_child) {
-            EXPECT_EQ(-1, ret);
-            EXPECT_EQ(EPERM, errno);
               EXPECT_EQ(EACCES, err_proc_read);
           } else {
-            EXPECT_EQ(0, ret);
               EXPECT_EQ(0, err_proc_read);
           }
           if (ret == 0) {