LXR linux/tools/testing/selftests/bpf/prog

   1// SPDX-License-Identifier: GPL-2.0
   2/* Copyright (c) 2021 Google LLC. */
   3
   4#include <test_progs.h>
   5#include "test_snprintf.skel.h"
   6#include "test_snprintf_single.skel.h"
   7
   8#define EXP_NUM_OUT  "-8 9 96 -424242 1337 DABBAD00"
   9#define EXP_NUM_RET  sizeof(EXP_NUM_OUT)
  10
  11#define EXP_IP_OUT   "127.000.000.001 0000:0000:0000:0000:0000:0000:0000:0001"
  12#define EXP_IP_RET   sizeof(EXP_IP_OUT)
  13
  14/* The third specifier, %pB, depends on compiler inlining so don't check it */
  15#define EXP_SYM_OUT  "schedule schedule+0x0/"
  16#define MIN_SYM_RET  sizeof(EXP_SYM_OUT)
  17
  18/* The third specifier, %p, is a hashed pointer which changes on every reboot */
  19#define EXP_ADDR_OUT "0000000000000000 ffff00000add4e55 "
  20#define EXP_ADDR_RET sizeof(EXP_ADDR_OUT "unknownhashedptr")
  21
  22#define EXP_STR_OUT  "str1 longstr"
  23#define EXP_STR_RET  sizeof(EXP_STR_OUT)
  24
  25#define EXP_OVER_OUT "%over"
  26#define EXP_OVER_RET 10
  27
  28#define EXP_PAD_OUT "    4 000"
  29#define EXP_PAD_RET 900007
  30
  31#define EXP_NO_ARG_OUT "simple case"
  32#define EXP_NO_ARG_RET 12
  33
  34#define EXP_NO_BUF_RET 29
  35
  36void test_snprintf_positive(void)
  37{
  38        char exp_addr_out[] = EXP_ADDR_OUT;
  39        char exp_sym_out[]  = EXP_SYM_OUT;
  40        struct test_snprintf *skel;
  41
  42        skel = test_snprintf__open_and_load();
  43        if (!ASSERT_OK_PTR(skel, "skel_open"))
  44                return;
  45
  46        skel->bss->pid = getpid();
  47
  48        if (!ASSERT_OK(test_snprintf__attach(skel), "skel_attach"))
  49                goto cleanup;
  50
  51        /* trigger tracepoint */
  52        usleep(1);
  53
  54        ASSERT_STREQ(skel->bss->num_out, EXP_NUM_OUT, "num_out");
  55        ASSERT_EQ(skel->bss->num_ret, EXP_NUM_RET, "num_ret");
  56
  57        ASSERT_STREQ(skel->bss->ip_out, EXP_IP_OUT, "ip_out");
  58        ASSERT_EQ(skel->bss->ip_ret, EXP_IP_RET, "ip_ret");
  59
  60        ASSERT_OK(memcmp(skel->bss->sym_out, exp_sym_out,
  61                         sizeof(exp_sym_out) - 1), "sym_out");
  62        ASSERT_LT(MIN_SYM_RET, skel->bss->sym_ret, "sym_ret");
  63
  64        ASSERT_OK(memcmp(skel->bss->addr_out, exp_addr_out,
  65                         sizeof(exp_addr_out) - 1), "addr_out");
  66        ASSERT_EQ(skel->bss->addr_ret, EXP_ADDR_RET, "addr_ret");
  67
  68        ASSERT_STREQ(skel->bss->str_out, EXP_STR_OUT, "str_out");
  69        ASSERT_EQ(skel->bss->str_ret, EXP_STR_RET, "str_ret");
  70
  71        ASSERT_STREQ(skel->bss->over_out, EXP_OVER_OUT, "over_out");
  72        ASSERT_EQ(skel->bss->over_ret, EXP_OVER_RET, "over_ret");
  73
  74        ASSERT_STREQ(skel->bss->pad_out, EXP_PAD_OUT, "pad_out");
  75        ASSERT_EQ(skel->bss->pad_ret, EXP_PAD_RET, "pad_ret");
  76
  77        ASSERT_STREQ(skel->bss->noarg_out, EXP_NO_ARG_OUT, "no_arg_out");
  78        ASSERT_EQ(skel->bss->noarg_ret, EXP_NO_ARG_RET, "no_arg_ret");
  79
  80        ASSERT_EQ(skel->bss->nobuf_ret, EXP_NO_BUF_RET, "no_buf_ret");
  81
  82cleanup:
  83        test_snprintf__destroy(skel);
  84}
  85
  86#define min(a, b) ((a) < (b) ? (a) : (b))
  87
  88/* Loads an eBPF object calling bpf_snprintf with up to 10 characters of fmt */
  89static int load_single_snprintf(char *fmt)
  90{
  91        struct test_snprintf_single *skel;
  92        int ret;
  93
  94        skel = test_snprintf_single__open();
  95        if (!skel)
  96                return -EINVAL;
  97
  98        memcpy(skel->rodata->fmt, fmt, min(strlen(fmt) + 1, 10));
  99
 100        ret = test_snprintf_single__load(skel);
 101        test_snprintf_single__destroy(skel);
 102
 103        return ret;
 104}
 105
 106void test_snprintf_negative(void)
 107{
 108        ASSERT_OK(load_single_snprintf("valid %d"), "valid usage");
 109
 110        ASSERT_ERR(load_single_snprintf("0123456789"), "no terminating zero");
 111        ASSERT_ERR(load_single_snprintf("%d %d"), "too many specifiers");
 112        ASSERT_ERR(load_single_snprintf("%pi5"), "invalid specifier 1");
 113        ASSERT_ERR(load_single_snprintf("%a"), "invalid specifier 2");
 114        ASSERT_ERR(load_single_snprintf("%"), "invalid specifier 3");
 115        ASSERT_ERR(load_single_snprintf("%12345678"), "invalid specifier 4");
 116        ASSERT_ERR(load_single_snprintf("%--------"), "invalid specifier 5");
 117        ASSERT_ERR(load_single_snprintf("\x80"), "non ascii character");
 118        ASSERT_ERR(load_single_snprintf("\x1"), "non printable character");
 119}
 120
 121void test_snprintf(void)
 122{
 123        if (test__start_subtest("snprintf_positive"))
 124                test_snprintf_positive();
 125        if (test__start_subtest("snprintf_negative"))
 126                test_snprintf_negative();
 127}
 128