selftests/bpf: Add a test for walking task->mm->exe_file.
Add a test that demonstrates safe walking of task->mm->exe_file
and passing file->f_path into bpf_d_path().
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
diff --git a/tools/testing/selftests/bpf/progs/test_d_path.c b/tools/testing/selftests/bpf/progs/test_d_path.c
index 84e1f88..b17638a 100644
--- a/tools/testing/selftests/bpf/progs/test_d_path.c
+++ b/tools/testing/selftests/bpf/progs/test_d_path.c
@@ -62,4 +62,23 @@ int BPF_PROG(prog_close, struct file *file, void *id)
return 0;
}
+SEC("lsm/file_open")
+int BPF_PROG(lsm_file_open, struct file* f)
+{
+ struct task_struct* task = (struct task_struct*)bpf_get_current_task_btf();
+ struct path* fpath = NULL;
+ struct mm_struct *mm;
+ struct file *exe_file;
+ char buf[128] = {};
+
+ mm = task->mm;
+ if (mm) {
+ exe_file = mm->exe_file;
+ if (exe_file)
+ fpath = &exe_file->f_path;
+ }
+ if (fpath)
+ bpf_d_path(fpath, buf, sizeof(buf));
+ return 0;
+}
char _license[] SEC("license") = "GPL";
