selftests/bpf: Add selftest for PTR_UNTRUSTED

Add a new selftest to check the PTR_UNTRUSTED condition. Below is the
result,

 #160     ptr_untrusted:OK

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Link: https://lore.kernel.org/r/20230713025642.27477-5-laoar.shao@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/tools/testing/selftests/bpf/prog_tests/ptr_untrusted.c b/tools/testing/selftests/bpf/prog_tests/ptr_untrusted.c
new file mode 100644 (file)
index 0000000..8d077d1
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/ptr_untrusted.c
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2023 Yafang Shao <laoar.shao@gmail.com> */
+
+#include <string.h>
+#include <linux/bpf.h>
+#include <test_progs.h>
+#include "test_ptr_untrusted.skel.h"
+
+#define TP_NAME "sched_switch"
+
+void serial_test_ptr_untrusted(void)
+{
+       struct test_ptr_untrusted *skel;
+       int err;
+
+       skel = test_ptr_untrusted__open_and_load();
+       if (!ASSERT_OK_PTR(skel, "skel_open"))
+               goto cleanup;
+
+       /* First, attach lsm prog */
+       skel->links.lsm_run = bpf_program__attach_lsm(skel->progs.lsm_run);
+       if (!ASSERT_OK_PTR(skel->links.lsm_run, "lsm_attach"))
+               goto cleanup;
+
+       /* Second, attach raw_tp prog. The lsm prog will be triggered. */
+       skel->links.raw_tp_run = bpf_program__attach_raw_tracepoint(skel->progs.raw_tp_run,
+                                                                   TP_NAME);
+       if (!ASSERT_OK_PTR(skel->links.raw_tp_run, "raw_tp_attach"))
+               goto cleanup;
+
+       err = strncmp(skel->bss->tp_name, TP_NAME, strlen(TP_NAME));
+       ASSERT_EQ(err, 0, "cmp_tp_name");
+
+cleanup:
+       test_ptr_untrusted__destroy(skel);
+}

diff --git a/tools/testing/selftests/bpf/progs/test_ptr_untrusted.c b/tools/testing/selftests/bpf/progs/test_ptr_untrusted.c
new file mode 100644 (file)
index 0000000..4bdd65b
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_ptr_untrusted.c
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2023 Yafang Shao <laoar.shao@gmail.com> */
+
+#include "vmlinux.h"
+#include <bpf/bpf_tracing.h>
+
+char tp_name[128];
+
+SEC("lsm/bpf")
+int BPF_PROG(lsm_run, int cmd, union bpf_attr *attr, unsigned int size)
+{
+       switch (cmd) {
+       case BPF_RAW_TRACEPOINT_OPEN:
+               bpf_probe_read_user_str(tp_name, sizeof(tp_name) - 1,
+                                       (void *)attr->raw_tracepoint.name);
+               break;
+       default:
+               break;
+       }
+       return 0;
+}
+
+SEC("raw_tracepoint")
+int BPF_PROG(raw_tp_run)
+{
+       return 0;
+}
+
+char _license[] SEC("license") = "GPL";