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* selftests/bpf: Add test involving restrict type qualifierDaniel Müller2022-07-081-2/+6
| | | | | | | | | | | This change adds a type based test involving the restrict type qualifier to the BPF selftests. On the btfgen path, this will verify that bpftool correctly handles the corresponding RESTRICT BTF kind. Signed-off-by: Daniel Müller <deso@posteo.net> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Quentin Monnet <quentin@isovalent.com> Link: https://lore.kernel.org/bpf/20220706212855.1700615-3-deso@posteo.net
* selftests/bpf: Add type match test against kernel's task_structDaniel Müller2022-07-051-0/+1
| | | | | | | | | | This change extends the existing core_reloc/kernel test to include a type match check of a local task_struct against the kernel's definition -- which we assume to succeed. Signed-off-by: Daniel Müller <deso@posteo.net> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20220628160127.607834-11-deso@posteo.net
* selftests/bpf: Add nested type to type based testsDaniel Müller2022-07-051-20/+42
| | | | | | | | | | | This change extends the type based tests with another struct type (in addition to a_struct) to check relocations against: a_complex_struct. This type is nested more deeply to provide additional coverage of certain paths in the type match logic. Signed-off-by: Daniel Müller <deso@posteo.net> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20220628160127.607834-10-deso@posteo.net
* selftests/bpf: Add test checking more characteristicsDaniel Müller2022-07-051-0/+51
| | | | | | | | | | | This change adds another type-based self-test that specifically aims to test some more characteristics of the TYPE_MATCH logic. Specifically, it covers a few more potential differences between types, such as different orders, enum variant values, and integer signedness. Signed-off-by: Daniel Müller <deso@posteo.net> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20220628160127.607834-9-deso@posteo.net
* selftests/bpf: Add type-match checks to type-based testsDaniel Müller2022-07-051-1/+13
| | | | | | | | | | | Now that we have type-match logic in both libbpf and the kernel, this change adjusts the existing BPF self tests to check this functionality. Specifically, we extend the existing type-based tests to check the previously introduced bpf_core_type_matches macro. Signed-off-by: Daniel Müller <deso@posteo.net> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20220628160127.607834-8-deso@posteo.net
* selftests/bpf: Add a test for enum64 value relocationsYonghong Song2022-06-071-0/+78
| | | | | | | | | | | Add a test for enum64 value relocations. The test will be skipped if clang version is 14 or lower since enum64 is only supported from version 15. Acked-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/r/20220607062718.3726307-1-yhs@fb.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
* selftests/bpf: Add bpf_core_field_offset() testsAndrii Nakryiko2022-05-091-0/+18
| | | | | | | | Add test cases for bpf_core_field_offset() helper. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20220509004148.1801791-7-andrii@kernel.org
* selftests/bpf: Fix field existence CO-RE reloc testsAndrii Nakryiko2021-04-261-18/+2
| | | | | | | | | | | | | | | | | | | | | | | | | Negative field existence cases for have a broken assumption that FIELD_EXISTS CO-RE relo will fail for fields that match the name but have incompatible type signature. That's not how CO-RE relocations generally behave. Types and fields that match by name but not by expected type are treated as non-matching candidates and are skipped. Error later is reported if no matching candidate was found. That's what happens for most relocations, but existence relocations (FIELD_EXISTS and TYPE_EXISTS) are more permissive and they are designed to return 0 or 1, depending if a match is found. This allows to handle name-conflicting but incompatible types in BPF code easily. Combined with ___flavor suffixes, it's possible to handle pretty much any structural type changes in kernel within the compiled once BPF source code. So, long story short, negative field existence test cases are invalid in their assumptions, so this patch reworks them into a single consolidated positive case that doesn't match any of the fields. Fixes: c7566a69695c ("selftests/bpf: Add field existence CO-RE relocs tests") Reported-by: Lorenz Bauer <lmb@cloudflare.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Lorenz Bauer <lmb@cloudflare.com> Link: https://lore.kernel.org/bpf/20210426192949.416837-5-andrii@kernel.org
* selftests/bpf: Add BTF_KIND_FLOAT to test_core_reloc_sizeIlya Leoshkevich2021-03-091-0/+5
| | | | | | | | | | Verify that bpf_core_field_size() is working correctly with floats. Also document the required clang version. Suggested-by: John Fastabend <john.fastabend@gmail.com> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20210309005649.162480-2-iii@linux.ibm.com
* selftests/bpf: Add CO-RE relocs selftest relying on kernel module BTFAndrii Nakryiko2020-12-031-0/+17
| | | | | | | | | | | Add a self-tests validating libbpf is able to perform CO-RE relocations against the type defined in kernel module BTF. if bpf_testmod.o is not supported by the kernel (e.g., due to version mismatch), skip tests, instead of failing. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20201203204634.1325171-9-andrii@kernel.org
* selftests/bpf: Add tests for ENUMVAL_EXISTS/ENUMVAL_VALUE relocationsAndrii Nakryiko2020-08-191-0/+84
| | | | | | | | | | | Add tests validating existence and value relocations for enum value-based relocations. If __builtin_preserve_enum_value() built-in is not supported, skip tests. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20200819194519.3375898-6-andriin@fb.com
* selftests/bpf: Add CO-RE relo test for TYPE_ID_LOCAL/TYPE_ID_TARGETAndrii Nakryiko2020-08-191-0/+41
| | | | | | | | | | | | Add tests for BTF type ID relocations. To allow testing this, enhance core_relo.c test runner to allow dynamic initialization of test inputs. If Clang doesn't have necessary support for new functionality, test is skipped. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20200819194519.3375898-4-andriin@fb.com
* selftests/bpf: Test TYPE_EXISTS and TYPE_SIZE CO-RE relocationsAndrii Nakryiko2020-08-191-1/+201
| | | | | | | | | | | | Add selftests for TYPE_EXISTS and TYPE_SIZE relocations, testing correctness of relocations and handling of type compatiblity/incompatibility. If __builtin_preserve_type_info() is not supported by compiler, skip tests. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20200819194519.3375898-3-andriin@fb.com
* selftests/bpf: Add test validating failure on ambiguous relocation valueAndrii Nakryiko2020-08-181-0/+25
| | | | | | | | | Add test simulating ambiguous field size relocation, while fields themselves are at the exact same offset. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200818223921.2911963-5-andriin@fb.com
* selftests/bpf: Correct various core_reloc 64-bit assumptionsAndrii Nakryiko2020-08-131-32/+37
| | | | | | | | | Ensure that types are memory layout- and field alignment-compatible regardless of 32/64-bitness mix of libbpf and BPF architecture. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200813204945.1020225-8-andriin@fb.com
* bpf, libbpf: Replace zero-length array with flexible-arrayGustavo A. R. Silva2020-05-111-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] sizeof(flexible-array-member) triggers a warning because flexible array members have incomplete type[1]. There are some instances of code in which the sizeof operator is being incorrectly/erroneously applied to zero-length arrays and the result is zero. Such instances may be hiding some bugs. So, this work (flexible-array member conversions) will also help to get completely rid of those sorts of issues. This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20200507185057.GA13981@embeddedor
* selftests/bpf: Add flexible array relocation testsAndrii Nakryiko2019-12-151-0/+39
| | | | | | | | Add few tests validation CO-RE relocation handling of flexible array accesses. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20191215070844.1014385-3-andriin@fb.com
* selftests/bpf: Add field size relocation testsAndrii Nakryiko2019-11-041-0/+31
| | | | | | | | | Add test verifying correctness and logic of field size relocation support in libbpf. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20191101222810.1246166-6-andriin@fb.com
* selftest/bpf: Add relocatable bitfield reading testsAndrii Nakryiko2019-11-041-0/+72
| | | | | | | | | | | Add a bunch of selftests verifying correctness of relocatable bitfield reading support in libbpf. Both bpf_probe_read()-based and direct read-based bitfield macros are tested. core_reloc.c "test_harness" is extended to support raw tracepoint and new typed raw tracepoints as test BPF program types. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20191101222810.1246166-5-andriin@fb.com
* selftests/bpf: Remove too strict field offset relo test casesAndrii Nakryiko2019-11-041-69/+1
| | | | | | | | | | As libbpf is going to gain support for more field relocations, including field size, some restrictions about exact size match are going to be lifted. Remove test cases that explicitly test such failures. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20191101222810.1246166-2-andriin@fb.com
* selftests/bpf: Make CO-RE reloc test impartial to test_progs flavorAndrii Nakryiko2019-10-171-1/+1
| | | | | | | | | | | | test_core_reloc_kernel test captures its own process name and validates it as part of the test. Given extra "flavors" of test_progs, this break for anything by default test_progs binary. Fix the test to cut out flavor part of the process name. Fixes: ee2eb063d330 ("selftests/bpf: Add BPF_CORE_READ and BPF_CORE_READ_STR_INTO macro tests") Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20191016060051.2024182-3-andriin@fb.com
* selftests/bpf: Add field existence CO-RE relocs testsAndrii Nakryiko2019-10-151-0/+56
| | | | | | | | | | | | Add a bunch of tests validating CO-RE is handling field existence relocation. Relaxed CO-RE relocation mode is activated for these new tests to prevent libbpf from rejecting BPF object for no-match relocation, even though test BPF program is not going to use that relocation, if field is missing. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20191015182849.3922287-6-andriin@fb.com
* selftests/bpf: Add BPF_CORE_READ and BPF_CORE_READ_STR_INTO macro testsAndrii Nakryiko2019-10-081-0/+9
| | | | | | | | | | | | | Validate BPF_CORE_READ correctness and handling of up to 9 levels of nestedness using cyclic task->(group_leader->)*->tgid chains. Also add a test of maximum-dpeth BPF_CORE_READ_STR_INTO() macro. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: John Fastabend <john.fastabend@gmail.com> Acked-by: Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/bpf/20191008175942.1769476-8-andriin@fb.com
* tools/bpf: fix core_reloc.c compilation errorYonghong Song2019-08-071-1/+1
| | | | | | | | | | | | | | | | | | | | | | On my local machine, I have the following compilation errors: ===== In file included from prog_tests/core_reloc.c:3:0: ./progs/core_reloc_types.h:517:46: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘fancy_char_ptr_t’ typedef const char * const volatile restrict fancy_char_ptr_t; ^ ./progs/core_reloc_types.h:527:2: error: unknown type name ‘fancy_char_ptr_t’ fancy_char_ptr_t d; ^ ===== I am using gcc 4.8.5. Later compilers may change their behavior not emitting the error. Nevertheless, let us fix the issue. "restrict" can be tested without typedef. Fixes: 9654e2ae908e ("selftests/bpf: add CO-RE relocs modifiers/typedef tests") Cc: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
* selftests/bpf: add CO-RE relocs misc testsAndrii Nakryiko2019-08-071-0/+25
| | | | | | | Add tests validating few edge-cases of capturing offset relocations. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
* selftests/bpf: add CO-RE relocs ints testsAndrii Nakryiko2019-08-071-0/+101
| | | | | | | | | Add various tests validating handling compatible/incompatible integer types. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
* selftests/bpf: add CO-RE relocs ptr-as-array testsAndrii Nakryiko2019-08-071-0/+13
| | | | | | | | | | | | Add test validating correct relocation handling for cases where pointer to something is used as an array. E.g.: int *ptr = ...; int x = ptr[42]; Signed-off-by: Andrii Nakryiko <andriin@fb.com> Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
* selftests/bpf: add CO-RE relocs modifiers/typedef testsAndrii Nakryiko2019-08-071-0/+72
| | | | | | | | | Add tests validating correct handling of various combinations of typedefs and const/volatile/restrict modifiers. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
* selftests/bpf: add CO-RE relocs enum/ptr/func_proto testsAndrii Nakryiko2019-08-071-0/+67
| | | | | | | | Test CO-RE relocation handling of ints, enums, pointers, func protos, etc. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
* selftests/bpf: add CO-RE relocs array testsAndrii Nakryiko2019-08-071-0/+81
| | | | | | | | Add tests for various array handling/relocation scenarios. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
* selftests/bpf: add CO-RE relocs nesting testsAndrii Nakryiko2019-08-071-0/+293
| | | | | | | | | Add a bunch of test validating correct handling of nested structs/unions. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
* selftests/bpf: add CO-RE relocs struct flavors testsAndrii Nakryiko2019-08-071-0/+15
Add tests verifying that BPF program can use various struct/union "flavors" to extract data from the same target struct/union. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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