selftests/bpf: Add test for passing in uninit mtu_len

Add a small test to pass an uninitialized mtu_len to the bpf_check_mtu()
helper to probe whether the verifier rejects it under !CAP_PERFMON.

  # ./vmtest.sh -- ./test_progs -t verifier_mtu
  [...]
  ./test_progs -t verifier_mtu
  [    1.414712] tsc: Refined TSC clocksource calibration: 3407.993 MHz
  [    1.415327] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x311fcd52370, max_idle_ns: 440795242006 ns
  [    1.416463] clocksource: Switched to clocksource tsc
  [    1.429842] bpf_testmod: loading out-of-tree module taints kernel.
  [    1.430283] bpf_testmod: module verification failed: signature and/or required key missing - tainting kernel
  #510/1   verifier_mtu/uninit/mtu: write rejected:OK
  #510     verifier_mtu:OK
  Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20241021152809.33343-5-daniel@iogearbox.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

Author: borkmann

tools/testing/selftests/bpf/prog_tests/verifier.c

@@ -54,6 +54,7 @@
 #include "verifier_masking.skel.h"
 #include "verifier_meta_access.skel.h"
 #include "verifier_movsx.skel.h"
+#include "verifier_mtu.skel.h"
 #include "verifier_netfilter_ctx.skel.h"
 #include "verifier_netfilter_retcode.skel.h"
 #include "verifier_bpf_fastcall.skel.h"
@@ -223,6 +224,24 @@ void test_verifier_xdp_direct_packet_access(void) { RUN(verifier_xdp_direct_pack
 void test_verifier_bits_iter(void) { RUN(verifier_bits_iter); }
 void test_verifier_lsm(void)                  { RUN(verifier_lsm); }
 
+void test_verifier_mtu(void)
+{
+	__u64 caps = 0;
+	int ret;
+
+	/* In case CAP_BPF and CAP_PERFMON is not set */
+	ret = cap_enable_effective(1ULL << CAP_BPF | 1ULL << CAP_NET_ADMIN, &caps);
+	if (!ASSERT_OK(ret, "set_cap_bpf_cap_net_admin"))
+		return;
+	ret = cap_disable_effective(1ULL << CAP_SYS_ADMIN | 1ULL << CAP_PERFMON, NULL);
+	if (!ASSERT_OK(ret, "disable_cap_sys_admin"))
+		goto restore_cap;
+	RUN(verifier_mtu);
+restore_cap:
+	if (caps)
+		cap_enable_effective(caps, NULL);
+}
+
 static int init_test_val_map(struct bpf_object *obj, char *map_name)
 {
 	struct test_val value = {

tools/testing/selftests/bpf/progs/verifier_mtu.c

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
+
+SEC("tc/ingress")
+__description("uninit/mtu: write rejected")
+__failure __msg("invalid indirect read from stack")
+int tc_uninit_mtu(struct __sk_buff *ctx)
+{
+	__u32 mtu;
+
+	bpf_check_mtu(ctx, 0, &mtu, 0, 0);
+	return TCX_PASS;
+}
+
+char LICENSE[] SEC("license") = "GPL";