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

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 /*
   4  * Copyright (C) 2022 Huawei Technologies Duesseldorf GmbH
   5  *
   6  * Author: Roberto Sassu <[email protected]>
   7  */
   8
   9 #include <linux/keyctl.h>
  10 #include <test_progs.h>
  11
  12 #include "test_lookup_key.skel.h"
  13
  14 #define KEY_LOOKUP_CREATE       0x01
  15 #define KEY_LOOKUP_PARTIAL      0x02
  16
  17 static bool kfunc_not_supported;
  18
  19 static int libbpf_print_cb(enum libbpf_print_level level, const char *fmt,
  20                            va_list args)
  21 {
  22         char *func;
  23
  24         if (strcmp(fmt, "libbpf: extern (func ksym) '%s': not found in kernel or module BTFs\n"))
  25                 return 0;
  26
  27         func = va_arg(args, char *);
  28
  29         if (strcmp(func, "bpf_lookup_user_key") && strcmp(func, "bpf_key_put") &&
  30             strcmp(func, "bpf_lookup_system_key"))
  31                 return 0;
  32
  33         kfunc_not_supported = true;
  34         return 0;
  35 }
  36
  37 void test_lookup_key(void)
  38 {
  39         libbpf_print_fn_t old_print_cb;
  40         struct test_lookup_key *skel;
  41         __u32 next_id;
  42         int ret;
  43
  44         skel = test_lookup_key__open();
  45         if (!ASSERT_OK_PTR(skel, "test_lookup_key__open"))
  46                 return;
  47
  48         old_print_cb = libbpf_set_print(libbpf_print_cb);
  49         ret = test_lookup_key__load(skel);
  50         libbpf_set_print(old_print_cb);
  51
  52         if (ret < 0 && kfunc_not_supported) {
  53                 printf("%s:SKIP:bpf_lookup_*_key(), bpf_key_put() kfuncs not supported\n",
  54                        __func__);
  55                 test__skip();
  56                 goto close_prog;
  57         }
  58
  59         if (!ASSERT_OK(ret, "test_lookup_key__load"))
  60                 goto close_prog;
  61
  62         ret = test_lookup_key__attach(skel);
  63         if (!ASSERT_OK(ret, "test_lookup_key__attach"))
  64                 goto close_prog;
  65
  66         skel->bss->monitored_pid = getpid();
  67         skel->bss->key_serial = KEY_SPEC_THREAD_KEYRING;
  68
  69         /* The thread-specific keyring does not exist, this test fails. */
  70         skel->bss->flags = 0;
  71
  72         ret = bpf_prog_get_next_id(0, &next_id);
  73         if (!ASSERT_LT(ret, 0, "bpf_prog_get_next_id"))
  74                 goto close_prog;
  75
  76         /* Force creation of the thread-specific keyring, this test succeeds. */
  77         skel->bss->flags = KEY_LOOKUP_CREATE;
  78
  79         ret = bpf_prog_get_next_id(0, &next_id);
  80         if (!ASSERT_OK(ret, "bpf_prog_get_next_id"))
  81                 goto close_prog;
  82
  83         /* Pass both lookup flags for parameter validation. */
  84         skel->bss->flags = KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL;
  85
  86         ret = bpf_prog_get_next_id(0, &next_id);
  87         if (!ASSERT_OK(ret, "bpf_prog_get_next_id"))
  88                 goto close_prog;
  89
  90         /* Pass invalid flags. */
  91         skel->bss->flags = UINT64_MAX;
  92
  93         ret = bpf_prog_get_next_id(0, &next_id);
  94         if (!ASSERT_LT(ret, 0, "bpf_prog_get_next_id"))
  95                 goto close_prog;
  96
  97         skel->bss->key_serial = 0;
  98         skel->bss->key_id = 1;
  99
 100         ret = bpf_prog_get_next_id(0, &next_id);
 101         if (!ASSERT_OK(ret, "bpf_prog_get_next_id"))
 102                 goto close_prog;
 103
 104         skel->bss->key_id = UINT32_MAX;
 105
 106         ret = bpf_prog_get_next_id(0, &next_id);
 107         ASSERT_LT(ret, 0, "bpf_prog_get_next_id");
 108
 109 close_prog:
 110         skel->bss->monitored_pid = 0;
 111         test_lookup_key__destroy(skel);
 112 }