selftests/bpf: Add dump type data tests to btf dump tests
Test various type data dumping operations by comparing expected format with the dumped string; an snprintf-style printf function is used to record the string dumped. Also verify overflow handling where the data passed does not cover the full size of a type, such as would occur if a tracer has a portion of the 8k "struct task_struct". Signed-off-by: Alan Maguire <alan.maguire@oracle.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/1626362126-27775-4-git-send-email-alan.maguire@oracle.com
This commit is contained in:
Alan Maguire
Andrii Nakryiko
parent
17283337ff
commit
70a9241fbc
@ -232,7 +232,576 @@ err_out:
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btf__free(btf);
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}
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#define STRSIZE 4096
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static void btf_dump_snprintf(void *ctx, const char *fmt, va_list args)
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{
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char *s = ctx, new[STRSIZE];
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vsnprintf(new, STRSIZE, fmt, args);
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if (strlen(s) < STRSIZE)
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strncat(s, new, STRSIZE - strlen(s) - 1);
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}
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static int btf_dump_data(struct btf *btf, struct btf_dump *d,
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char *name, char *prefix, __u64 flags, void *ptr,
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size_t ptr_sz, char *str, const char *expected_val)
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{
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DECLARE_LIBBPF_OPTS(btf_dump_type_data_opts, opts);
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size_t type_sz;
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__s32 type_id;
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int ret = 0;
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if (flags & BTF_F_COMPACT)
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opts.compact = true;
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if (flags & BTF_F_NONAME)
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opts.skip_names = true;
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if (flags & BTF_F_ZERO)
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opts.emit_zeroes = true;
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if (prefix) {
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ASSERT_STRNEQ(name, prefix, strlen(prefix),
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"verify prefix match");
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name += strlen(prefix) + 1;
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}
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type_id = btf__find_by_name(btf, name);
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if (!ASSERT_GE(type_id, 0, "find type id"))
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return -ENOENT;
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type_sz = btf__resolve_size(btf, type_id);
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str[0] = '\0';
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ret = btf_dump__dump_type_data(d, type_id, ptr, ptr_sz, &opts);
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if (type_sz <= ptr_sz) {
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if (!ASSERT_EQ(ret, type_sz, "failed/unexpected type_sz"))
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return -EINVAL;
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} else {
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if (!ASSERT_EQ(ret, -E2BIG, "failed to return -E2BIG"))
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return -EINVAL;
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}
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if (!ASSERT_STREQ(str, expected_val, "ensure expected/actual match"))
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return -EFAULT;
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return 0;
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}
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#define TEST_BTF_DUMP_DATA(_b, _d, _prefix, _str, _type, _flags, \
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_expected, ...) \
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do { \
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char __ptrtype[64] = #_type; \
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char *_ptrtype = (char *)__ptrtype; \
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_type _ptrdata = __VA_ARGS__; \
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void *_ptr = &_ptrdata; \
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\
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(void) btf_dump_data(_b, _d, _ptrtype, _prefix, _flags, \
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_ptr, sizeof(_type), _str, \
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_expected); \
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} while (0)
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/* Use where expected data string matches its stringified declaration */
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#define TEST_BTF_DUMP_DATA_C(_b, _d, _prefix, _str, _type, _flags, \
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...) \
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TEST_BTF_DUMP_DATA(_b, _d, _prefix, _str, _type, _flags, \
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"(" #_type ")" #__VA_ARGS__, __VA_ARGS__)
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/* overflow test; pass typesize < expected type size, ensure E2BIG returned */
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#define TEST_BTF_DUMP_DATA_OVER(_b, _d, _prefix, _str, _type, _type_sz, \
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_expected, ...) \
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do { \
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char __ptrtype[64] = #_type; \
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char *_ptrtype = (char *)__ptrtype; \
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_type _ptrdata = __VA_ARGS__; \
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void *_ptr = &_ptrdata; \
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\
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(void) btf_dump_data(_b, _d, _ptrtype, _prefix, 0, \
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_ptr, _type_sz, _str, _expected); \
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} while (0)
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#define TEST_BTF_DUMP_VAR(_b, _d, _prefix, _str, _var, _type, _flags, \
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_expected, ...) \
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do { \
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_type _ptrdata = __VA_ARGS__; \
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void *_ptr = &_ptrdata; \
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\
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(void) btf_dump_data(_b, _d, _var, _prefix, _flags, \
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_ptr, sizeof(_type), _str, \
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_expected); \
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} while (0)
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static void test_btf_dump_int_data(struct btf *btf, struct btf_dump *d,
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char *str)
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{
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/* simple int */
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TEST_BTF_DUMP_DATA_C(btf, d, NULL, str, int, BTF_F_COMPACT, 1234);
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, BTF_F_COMPACT | BTF_F_NONAME,
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"1234", 1234);
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, 0, "(int)1234", 1234);
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/* zero value should be printed at toplevel */
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, BTF_F_COMPACT, "(int)0", 0);
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, BTF_F_COMPACT | BTF_F_NONAME,
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"0", 0);
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, BTF_F_COMPACT | BTF_F_ZERO,
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"(int)0", 0);
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, int,
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BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
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"0", 0);
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TEST_BTF_DUMP_DATA_C(btf, d, NULL, str, int, BTF_F_COMPACT, -4567);
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, BTF_F_COMPACT | BTF_F_NONAME,
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"-4567", -4567);
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, 0, "(int)-4567", -4567);
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TEST_BTF_DUMP_DATA_OVER(btf, d, NULL, str, int, sizeof(int)-1, "", 1);
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}
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static void test_btf_dump_float_data(struct btf *btf, struct btf_dump *d,
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char *str)
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{
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float t1 = 1.234567;
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float t2 = -1.234567;
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float t3 = 0.0;
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double t4 = 5.678912;
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double t5 = -5.678912;
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double t6 = 0.0;
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long double t7 = 9.876543;
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long double t8 = -9.876543;
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long double t9 = 0.0;
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/* since the kernel does not likely have any float types in its BTF, we
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* will need to add some of various sizes.
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*/
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ASSERT_GT(btf__add_float(btf, "test_float", 4), 0, "add float");
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ASSERT_OK(btf_dump_data(btf, d, "test_float", NULL, 0, &t1, 4, str,
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"(test_float)1.234567"), "dump float");
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ASSERT_OK(btf_dump_data(btf, d, "test_float", NULL, 0, &t2, 4, str,
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"(test_float)-1.234567"), "dump float");
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ASSERT_OK(btf_dump_data(btf, d, "test_float", NULL, 0, &t3, 4, str,
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"(test_float)0.000000"), "dump float");
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ASSERT_GT(btf__add_float(btf, "test_double", 8), 0, "add_double");
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ASSERT_OK(btf_dump_data(btf, d, "test_double", NULL, 0, &t4, 8, str,
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"(test_double)5.678912"), "dump double");
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ASSERT_OK(btf_dump_data(btf, d, "test_double", NULL, 0, &t5, 8, str,
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"(test_double)-5.678912"), "dump double");
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ASSERT_OK(btf_dump_data(btf, d, "test_double", NULL, 0, &t6, 8, str,
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"(test_double)0.000000"), "dump double");
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ASSERT_GT(btf__add_float(btf, "test_long_double", 16), 0, "add long double");
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ASSERT_OK(btf_dump_data(btf, d, "test_long_double", NULL, 0, &t7, 16,
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str, "(test_long_double)9.876543"),
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"dump long_double");
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ASSERT_OK(btf_dump_data(btf, d, "test_long_double", NULL, 0, &t8, 16,
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str, "(test_long_double)-9.876543"),
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"dump long_double");
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ASSERT_OK(btf_dump_data(btf, d, "test_long_double", NULL, 0, &t9, 16,
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str, "(test_long_double)0.000000"),
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"dump long_double");
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}
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static void test_btf_dump_char_data(struct btf *btf, struct btf_dump *d,
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char *str)
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{
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/* simple char */
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TEST_BTF_DUMP_DATA_C(btf, d, NULL, str, char, BTF_F_COMPACT, 100);
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, BTF_F_COMPACT | BTF_F_NONAME,
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"100", 100);
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, 0, "(char)100", 100);
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/* zero value should be printed at toplevel */
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, BTF_F_COMPACT,
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"(char)0", 0);
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, BTF_F_COMPACT | BTF_F_NONAME,
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"0", 0);
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, BTF_F_COMPACT | BTF_F_ZERO,
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"(char)0", 0);
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
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"0", 0);
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, 0, "(char)0", 0);
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TEST_BTF_DUMP_DATA_OVER(btf, d, NULL, str, char, sizeof(char)-1, "", 100);
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}
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static void test_btf_dump_typedef_data(struct btf *btf, struct btf_dump *d,
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char *str)
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{
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/* simple typedef */
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TEST_BTF_DUMP_DATA_C(btf, d, NULL, str, uint64_t, BTF_F_COMPACT, 100);
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64, BTF_F_COMPACT | BTF_F_NONAME,
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"1", 1);
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64, 0, "(u64)1", 1);
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/* zero value should be printed at toplevel */
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64, BTF_F_COMPACT, "(u64)0", 0);
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64, BTF_F_COMPACT | BTF_F_NONAME,
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"0", 0);
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64, BTF_F_COMPACT | BTF_F_ZERO,
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"(u64)0", 0);
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64,
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BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
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"0", 0);
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64, 0, "(u64)0", 0);
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/* typedef struct */
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TEST_BTF_DUMP_DATA_C(btf, d, NULL, str, atomic_t, BTF_F_COMPACT,
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{.counter = (int)1,});
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, BTF_F_COMPACT | BTF_F_NONAME,
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"{1,}", { .counter = 1 });
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, 0,
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"(atomic_t){\n"
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" .counter = (int)1,\n"
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"}",
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{.counter = 1,});
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/* typedef with 0 value should be printed at toplevel */
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, BTF_F_COMPACT, "(atomic_t){}",
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{.counter = 0,});
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, BTF_F_COMPACT | BTF_F_NONAME,
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"{}", {.counter = 0,});
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, 0,
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"(atomic_t){\n"
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"}",
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{.counter = 0,});
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, BTF_F_COMPACT | BTF_F_ZERO,
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"(atomic_t){.counter = (int)0,}",
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{.counter = 0,});
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t,
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BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
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"{0,}", {.counter = 0,});
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TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, BTF_F_ZERO,
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"(atomic_t){\n"
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" .counter = (int)0,\n"
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"}",
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{ .counter = 0,});
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/* overflow should show type but not value since it overflows */
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TEST_BTF_DUMP_DATA_OVER(btf, d, NULL, str, atomic_t, sizeof(atomic_t)-1,
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"(atomic_t){\n", { .counter = 1});
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}
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static void test_btf_dump_enum_data(struct btf *btf, struct btf_dump *d,
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char *str)
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{
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/* enum where enum value does (and does not) exist */
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TEST_BTF_DUMP_DATA_C(btf, d, "enum", str, enum bpf_cmd, BTF_F_COMPACT,
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BPF_MAP_CREATE);
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TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd, BTF_F_COMPACT,
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"(enum bpf_cmd)BPF_MAP_CREATE", 0);
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TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd,
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BTF_F_COMPACT | BTF_F_NONAME,
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"BPF_MAP_CREATE",
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BPF_MAP_CREATE);
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TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd, 0,
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"(enum bpf_cmd)BPF_MAP_CREATE",
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BPF_MAP_CREATE);
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TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd,
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BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
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"BPF_MAP_CREATE", 0);
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TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd,
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BTF_F_COMPACT | BTF_F_ZERO,
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"(enum bpf_cmd)BPF_MAP_CREATE",
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BPF_MAP_CREATE);
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TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd,
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BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
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"BPF_MAP_CREATE", BPF_MAP_CREATE);
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TEST_BTF_DUMP_DATA_C(btf, d, "enum", str, enum bpf_cmd, BTF_F_COMPACT, 2000);
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TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd,
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BTF_F_COMPACT | BTF_F_NONAME,
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"2000", 2000);
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TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd, 0,
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"(enum bpf_cmd)2000", 2000);
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TEST_BTF_DUMP_DATA_OVER(btf, d, "enum", str, enum bpf_cmd,
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sizeof(enum bpf_cmd) - 1, "", BPF_MAP_CREATE);
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}
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static void test_btf_dump_struct_data(struct btf *btf, struct btf_dump *d,
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char *str)
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{
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DECLARE_LIBBPF_OPTS(btf_dump_type_data_opts, opts);
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char zero_data[512] = { };
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char type_data[512];
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void *fops = type_data;
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void *skb = type_data;
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size_t type_sz;
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__s32 type_id;
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char *cmpstr;
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int ret;
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memset(type_data, 255, sizeof(type_data));
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/* simple struct */
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TEST_BTF_DUMP_DATA_C(btf, d, "struct", str, struct btf_enum, BTF_F_COMPACT,
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{.name_off = (__u32)3,.val = (__s32)-1,});
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TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum,
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BTF_F_COMPACT | BTF_F_NONAME,
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"{3,-1,}",
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{ .name_off = 3, .val = -1,});
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TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum, 0,
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"(struct btf_enum){\n"
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" .name_off = (__u32)3,\n"
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" .val = (__s32)-1,\n"
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"}",
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{ .name_off = 3, .val = -1,});
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TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum,
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BTF_F_COMPACT | BTF_F_NONAME,
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"{-1,}",
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{ .name_off = 0, .val = -1,});
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TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum,
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BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
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"{0,-1,}",
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{ .name_off = 0, .val = -1,});
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/* empty struct should be printed */
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TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum, BTF_F_COMPACT,
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"(struct btf_enum){}",
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{ .name_off = 0, .val = 0,});
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TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum,
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BTF_F_COMPACT | BTF_F_NONAME,
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"{}",
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{ .name_off = 0, .val = 0,});
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TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum, 0,
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"(struct btf_enum){\n"
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"}",
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{ .name_off = 0, .val = 0,});
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TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum,
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BTF_F_COMPACT | BTF_F_ZERO,
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"(struct btf_enum){.name_off = (__u32)0,.val = (__s32)0,}",
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{ .name_off = 0, .val = 0,});
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TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum,
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BTF_F_ZERO,
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"(struct btf_enum){\n"
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" .name_off = (__u32)0,\n"
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" .val = (__s32)0,\n"
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"}",
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{ .name_off = 0, .val = 0,});
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/* struct with pointers */
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TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct list_head, BTF_F_COMPACT,
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"(struct list_head){.next = (struct list_head *)0x1,}",
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{ .next = (struct list_head *)1 });
|
||||
TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct list_head, 0,
|
||||
"(struct list_head){\n"
|
||||
" .next = (struct list_head *)0x1,\n"
|
||||
"}",
|
||||
{ .next = (struct list_head *)1 });
|
||||
/* NULL pointer should not be displayed */
|
||||
TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct list_head, BTF_F_COMPACT,
|
||||
"(struct list_head){}",
|
||||
{ .next = (struct list_head *)0 });
|
||||
TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct list_head, 0,
|
||||
"(struct list_head){\n"
|
||||
"}",
|
||||
{ .next = (struct list_head *)0 });
|
||||
|
||||
/* struct with function pointers */
|
||||
type_id = btf__find_by_name(btf, "file_operations");
|
||||
if (ASSERT_GT(type_id, 0, "find type id")) {
|
||||
type_sz = btf__resolve_size(btf, type_id);
|
||||
str[0] = '\0';
|
||||
|
||||
ret = btf_dump__dump_type_data(d, type_id, fops, type_sz, &opts);
|
||||
ASSERT_EQ(ret, type_sz,
|
||||
"unexpected return value dumping file_operations");
|
||||
cmpstr =
|
||||
"(struct file_operations){\n"
|
||||
" .owner = (struct module *)0xffffffffffffffff,\n"
|
||||
" .llseek = (loff_t (*)(struct file *, loff_t, int))0xffffffffffffffff,";
|
||||
|
||||
ASSERT_STRNEQ(str, cmpstr, strlen(cmpstr), "file_operations");
|
||||
}
|
||||
|
||||
/* struct with char array */
|
||||
TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_prog_info, BTF_F_COMPACT,
|
||||
"(struct bpf_prog_info){.name = (char[16])['f','o','o',],}",
|
||||
{ .name = "foo",});
|
||||
TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_prog_info,
|
||||
BTF_F_COMPACT | BTF_F_NONAME,
|
||||
"{['f','o','o',],}",
|
||||
{.name = "foo",});
|
||||
TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_prog_info, 0,
|
||||
"(struct bpf_prog_info){\n"
|
||||
" .name = (char[16])[\n"
|
||||
" 'f',\n"
|
||||
" 'o',\n"
|
||||
" 'o',\n"
|
||||
" ],\n"
|
||||
"}",
|
||||
{.name = "foo",});
|
||||
/* leading null char means do not display string */
|
||||
TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_prog_info, BTF_F_COMPACT,
|
||||
"(struct bpf_prog_info){}",
|
||||
{.name = {'\0', 'f', 'o', 'o'}});
|
||||
/* handle non-printable characters */
|
||||
TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_prog_info, BTF_F_COMPACT,
|
||||
"(struct bpf_prog_info){.name = (char[16])[1,2,3,],}",
|
||||
{ .name = {1, 2, 3, 0}});
|
||||
|
||||
/* struct with non-char array */
|
||||
TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct __sk_buff, BTF_F_COMPACT,
|
||||
"(struct __sk_buff){.cb = (__u32[5])[1,2,3,4,5,],}",
|
||||
{ .cb = {1, 2, 3, 4, 5,},});
|
||||
TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct __sk_buff,
|
||||
BTF_F_COMPACT | BTF_F_NONAME,
|
||||
"{[1,2,3,4,5,],}",
|
||||
{ .cb = { 1, 2, 3, 4, 5},});
|
||||
TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct __sk_buff, 0,
|
||||
"(struct __sk_buff){\n"
|
||||
" .cb = (__u32[5])[\n"
|
||||
" 1,\n"
|
||||
" 2,\n"
|
||||
" 3,\n"
|
||||
" 4,\n"
|
||||
" 5,\n"
|
||||
" ],\n"
|
||||
"}",
|
||||
{ .cb = { 1, 2, 3, 4, 5},});
|
||||
/* For non-char, arrays, show non-zero values only */
|
||||
TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct __sk_buff, BTF_F_COMPACT,
|
||||
"(struct __sk_buff){.cb = (__u32[5])[0,0,1,0,0,],}",
|
||||
{ .cb = { 0, 0, 1, 0, 0},});
|
||||
TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct __sk_buff, 0,
|
||||
"(struct __sk_buff){\n"
|
||||
" .cb = (__u32[5])[\n"
|
||||
" 0,\n"
|
||||
" 0,\n"
|
||||
" 1,\n"
|
||||
" 0,\n"
|
||||
" 0,\n"
|
||||
" ],\n"
|
||||
"}",
|
||||
{ .cb = { 0, 0, 1, 0, 0},});
|
||||
|
||||
/* struct with bitfields */
|
||||
TEST_BTF_DUMP_DATA_C(btf, d, "struct", str, struct bpf_insn, BTF_F_COMPACT,
|
||||
{.code = (__u8)1,.dst_reg = (__u8)0x2,.src_reg = (__u8)0x3,.off = (__s16)4,.imm = (__s32)5,});
|
||||
TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_insn,
|
||||
BTF_F_COMPACT | BTF_F_NONAME,
|
||||
"{1,0x2,0x3,4,5,}",
|
||||
{ .code = 1, .dst_reg = 0x2, .src_reg = 0x3, .off = 4,
|
||||
.imm = 5,});
|
||||
TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_insn, 0,
|
||||
"(struct bpf_insn){\n"
|
||||
" .code = (__u8)1,\n"
|
||||
" .dst_reg = (__u8)0x2,\n"
|
||||
" .src_reg = (__u8)0x3,\n"
|
||||
" .off = (__s16)4,\n"
|
||||
" .imm = (__s32)5,\n"
|
||||
"}",
|
||||
{.code = 1, .dst_reg = 2, .src_reg = 3, .off = 4, .imm = 5});
|
||||
|
||||
/* zeroed bitfields should not be displayed */
|
||||
TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_insn, BTF_F_COMPACT,
|
||||
"(struct bpf_insn){.dst_reg = (__u8)0x1,}",
|
||||
{ .code = 0, .dst_reg = 1});
|
||||
|
||||
/* struct with enum bitfield */
|
||||
type_id = btf__find_by_name(btf, "fs_context");
|
||||
if (ASSERT_GT(type_id, 0, "find fs_context")) {
|
||||
type_sz = btf__resolve_size(btf, type_id);
|
||||
str[0] = '\0';
|
||||
|
||||
opts.emit_zeroes = true;
|
||||
ret = btf_dump__dump_type_data(d, type_id, zero_data, type_sz, &opts);
|
||||
ASSERT_EQ(ret, type_sz,
|
||||
"unexpected return value dumping fs_context");
|
||||
|
||||
ASSERT_NEQ(strstr(str, "FS_CONTEXT_FOR_MOUNT"), NULL,
|
||||
"bitfield value not present");
|
||||
}
|
||||
|
||||
/* struct with nested anon union */
|
||||
TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_sock_ops, BTF_F_COMPACT,
|
||||
"(struct bpf_sock_ops){.op = (__u32)1,(union){.args = (__u32[4])[1,2,3,4,],.reply = (__u32)1,.replylong = (__u32[4])[1,2,3,4,],},}",
|
||||
{ .op = 1, .args = { 1, 2, 3, 4}});
|
||||
|
||||
/* union with nested struct */
|
||||
TEST_BTF_DUMP_DATA(btf, d, "union", str, union bpf_iter_link_info, BTF_F_COMPACT,
|
||||
"(union bpf_iter_link_info){.map = (struct){.map_fd = (__u32)1,},}",
|
||||
{ .map = { .map_fd = 1 }});
|
||||
|
||||
/* struct skb with nested structs/unions; because type output is so
|
||||
* complex, we don't do a string comparison, just verify we return
|
||||
* the type size as the amount of data displayed.
|
||||
*/
|
||||
type_id = btf__find_by_name(btf, "sk_buff");
|
||||
if (ASSERT_GT(type_id, 0, "find struct sk_buff")) {
|
||||
type_sz = btf__resolve_size(btf, type_id);
|
||||
str[0] = '\0';
|
||||
|
||||
ret = btf_dump__dump_type_data(d, type_id, skb, type_sz, &opts);
|
||||
ASSERT_EQ(ret, type_sz,
|
||||
"unexpected return value dumping sk_buff");
|
||||
}
|
||||
|
||||
/* overflow bpf_sock_ops struct with final element nonzero/zero.
|
||||
* Regardless of the value of the final field, we don't have all the
|
||||
* data we need to display it, so we should trigger an overflow.
|
||||
* In other words oveflow checking should trump "is field zero?"
|
||||
* checks because if we've overflowed, it shouldn't matter what the
|
||||
* field is - we can't trust its value so shouldn't display it.
|
||||
*/
|
||||
TEST_BTF_DUMP_DATA_OVER(btf, d, "struct", str, struct bpf_sock_ops,
|
||||
sizeof(struct bpf_sock_ops) - 1,
|
||||
"(struct bpf_sock_ops){\n\t.op = (__u32)1,\n",
|
||||
{ .op = 1, .skb_tcp_flags = 2});
|
||||
TEST_BTF_DUMP_DATA_OVER(btf, d, "struct", str, struct bpf_sock_ops,
|
||||
sizeof(struct bpf_sock_ops) - 1,
|
||||
"(struct bpf_sock_ops){\n\t.op = (__u32)1,\n",
|
||||
{ .op = 1, .skb_tcp_flags = 0});
|
||||
}
|
||||
|
||||
static void test_btf_dump_var_data(struct btf *btf, struct btf_dump *d,
|
||||
char *str)
|
||||
{
|
||||
TEST_BTF_DUMP_VAR(btf, d, NULL, str, "cpu_number", int, BTF_F_COMPACT,
|
||||
"int cpu_number = (int)100", 100);
|
||||
TEST_BTF_DUMP_VAR(btf, d, NULL, str, "cpu_profile_flip", int, BTF_F_COMPACT,
|
||||
"static int cpu_profile_flip = (int)2", 2);
|
||||
}
|
||||
|
||||
static void test_btf_datasec(struct btf *btf, struct btf_dump *d, char *str,
|
||||
const char *name, const char *expected_val,
|
||||
void *data, size_t data_sz)
|
||||
{
|
||||
DECLARE_LIBBPF_OPTS(btf_dump_type_data_opts, opts);
|
||||
int ret = 0, cmp;
|
||||
size_t secsize;
|
||||
__s32 type_id;
|
||||
|
||||
opts.compact = true;
|
||||
|
||||
type_id = btf__find_by_name(btf, name);
|
||||
if (!ASSERT_GT(type_id, 0, "find type id"))
|
||||
return;
|
||||
|
||||
secsize = btf__resolve_size(btf, type_id);
|
||||
ASSERT_EQ(secsize, 0, "verify section size");
|
||||
|
||||
str[0] = '\0';
|
||||
ret = btf_dump__dump_type_data(d, type_id, data, data_sz, &opts);
|
||||
ASSERT_EQ(ret, 0, "unexpected return value");
|
||||
|
||||
cmp = strcmp(str, expected_val);
|
||||
ASSERT_EQ(cmp, 0, "ensure expected/actual match");
|
||||
}
|
||||
|
||||
static void test_btf_dump_datasec_data(char *str)
|
||||
{
|
||||
struct btf *btf = btf__parse("xdping_kern.o", NULL);
|
||||
struct btf_dump_opts opts = { .ctx = str };
|
||||
char license[4] = "GPL";
|
||||
struct btf_dump *d;
|
||||
|
||||
if (!ASSERT_OK_PTR(btf, "xdping_kern.o BTF not found"))
|
||||
return;
|
||||
|
||||
d = btf_dump__new(btf, NULL, &opts, btf_dump_snprintf);
|
||||
if (!ASSERT_OK_PTR(d, "could not create BTF dump"))
|
||||
return;
|
||||
|
||||
test_btf_datasec(btf, d, str, "license",
|
||||
"SEC(\"license\") char[4] _license = (char[4])['G','P','L',];",
|
||||
license, sizeof(license));
|
||||
}
|
||||
|
||||
void test_btf_dump() {
|
||||
char str[STRSIZE];
|
||||
struct btf_dump_opts opts = { .ctx = str };
|
||||
struct btf_dump *d;
|
||||
struct btf *btf;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(btf_dump_test_cases); i++) {
|
||||
@ -245,4 +814,33 @@ void test_btf_dump() {
|
||||
}
|
||||
if (test__start_subtest("btf_dump: incremental"))
|
||||
test_btf_dump_incremental();
|
||||
|
||||
btf = libbpf_find_kernel_btf();
|
||||
if (!ASSERT_OK_PTR(btf, "no kernel BTF found"))
|
||||
return;
|
||||
|
||||
d = btf_dump__new(btf, NULL, &opts, btf_dump_snprintf);
|
||||
if (!ASSERT_OK_PTR(d, "could not create BTF dump"))
|
||||
return;
|
||||
|
||||
/* Verify type display for various types. */
|
||||
if (test__start_subtest("btf_dump: int_data"))
|
||||
test_btf_dump_int_data(btf, d, str);
|
||||
if (test__start_subtest("btf_dump: float_data"))
|
||||
test_btf_dump_float_data(btf, d, str);
|
||||
if (test__start_subtest("btf_dump: char_data"))
|
||||
test_btf_dump_char_data(btf, d, str);
|
||||
if (test__start_subtest("btf_dump: typedef_data"))
|
||||
test_btf_dump_typedef_data(btf, d, str);
|
||||
if (test__start_subtest("btf_dump: enum_data"))
|
||||
test_btf_dump_enum_data(btf, d, str);
|
||||
if (test__start_subtest("btf_dump: struct_data"))
|
||||
test_btf_dump_struct_data(btf, d, str);
|
||||
if (test__start_subtest("btf_dump: var_data"))
|
||||
test_btf_dump_var_data(btf, d, str);
|
||||
btf_dump__free(d);
|
||||
btf__free(btf);
|
||||
|
||||
if (test__start_subtest("btf_dump: datasec_data"))
|
||||
test_btf_dump_datasec_data(str);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user