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selftests/bpf: Add test for abnormal cnt during multi-kprobe attachment

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If an abnormally huge cnt is used for multi-kprobes attachment, the
following warning will be reported:

  ------------[ cut here ]------------
  WARNING: CPU: 1 PID: 392 at mm/util.c:632 kvmalloc_node+0xd9/0xe0
  Modules linked in: bpf_testmod(O)
  CPU: 1 PID: 392 Comm: test_progs Tainted: G ...... 6.7.0-rc3+ #32
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
  ......
  RIP: 0010:kvmalloc_node+0xd9/0xe0
   ? __warn+0x89/0x150
   ? kvmalloc_node+0xd9/0xe0
   bpf_kprobe_multi_link_attach+0x87/0x670
   __sys_bpf+0x2a28/0x2bc0
   __x64_sys_bpf+0x1a/0x30
   do_syscall_64+0x36/0xb0
   entry_SYSCALL_64_after_hwframe+0x6e/0x76
  RIP: 0033:0x7fbe067f0e0d
  ......
   </TASK>
  ---[ end trace 0000000000000000 ]---

So add a test to ensure the warning is fixed.

Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20231215100708.2265609-6-houtao@huaweicloud.com
This commit is contained in:
Hou Tao 2023-12-15 18:07:08 +08:00 committed by Daniel Borkmann
parent 00cdcd2900
commit 1467affd16
1 changed files with 15 additions and 0 deletions
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15
tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
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@ -306,6 +306,21 @@ static void test_attach_api_fails(void)
if (!ASSERT_EQ(saved_error, -EINVAL, "fail_5_error"))
goto cleanup;
/* fail_6 - abnormal cnt */
opts.addrs = (const unsigned long *) addrs;
opts.syms = NULL;
opts.cnt = INT_MAX;
opts.cookies = NULL;
link = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe_manual,
NULL, &opts);
saved_error = -errno;
if (!ASSERT_ERR_PTR(link, "fail_6"))
goto cleanup;
if (!ASSERT_EQ(saved_error, -E2BIG, "fail_6_error"))
goto cleanup;
cleanup:
bpf_link__destroy(link);
kprobe_multi__destroy(skel);