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2024-01-03selftests/bpf: Attempt to build BPF programs with -Wsign-compareAlexei Starovoitov1-1/+1
GCC's -Wall includes -Wsign-compare while clang does not. Since BPF programs are built with clang we need to add this flag explicitly to catch problematic comparisons like: int i = -1; unsigned int j = 1; if (i < j) // this is false. long i = -1; unsigned int j = 1; if (i < j) // this is true. C standard for reference: - If either operand is unsigned long the other shall be converted to unsigned long. - Otherwise, if one operand is a long int and the other unsigned int, then if a long int can represent all the values of an unsigned int, the unsigned int shall be converted to a long int; otherwise both operands shall be converted to unsigned long int. - Otherwise, if either operand is long, the other shall be converted to long. - Otherwise, if either operand is unsigned, the other shall be converted to unsigned. Unfortunately clang's -Wsign-compare is very noisy. It complains about (s32)a == (u32)b which is safe and doen't have surprising behavior. This patch fixes some of the issues. It needs a follow up to fix the rest. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Jiri Olsa <jolsa@kernel.org> Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/bpf/20231226191148.48536-2-alexei.starovoitov@gmail.com
2022-07-05selftests/bpf: Add type match test against kernel's task_structDaniel Müller1-0/+19
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
2020-08-19selftests/bpf: Test TYPE_EXISTS and TYPE_SIZE CO-RE relocationsAndrii Nakryiko1-0/+2
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
2020-01-20selftests: Use consistent include paths for libbpfToke Høiland-Jørgensen1-2/+2
Fix all selftests to include libbpf header files with the bpf/ prefix, to be consistent with external users of the library. Also ensure that all includes of exported libbpf header files (those that are exported on 'make install' of the library) use bracketed includes instead of quoted. To not break the build, keep the old include path until everything has been changed to the new one; a subsequent patch will remove that. Fixes: 6910d7d3867a ("selftests/bpf: Ensure bpf_helper_defs.h are taken from selftests dir") Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/157952560568.1683545.9649335788846513446.stgit@toke.dk
2019-11-24selftests/bpf: Ensure core_reloc_kernel is reading test_progs's data onlyAndrii Nakryiko1-0/+4
test_core_reloc_kernel.c selftest is the only CO-RE test that reads and returns for validation calling thread's information (pid, tgid, comm). Thus it has to make sure that only test_prog's invocations are honored. Fixes: df36e621418b ("selftests/bpf: add CO-RE relocs testing setup") Reported-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: John Fastabend <john.fastabend@gmail.com> Link: https://lore.kernel.org/bpf/20191121175900.3486133-1-andriin@fb.com
2019-11-24libbpf: Support initialized global variablesAndrii Nakryiko1-2/+2
Initialized global variables are no different in ELF from static variables, and don't require any extra support from libbpf. But they are matching semantics of global data (backed by BPF maps) more closely, preventing LLVM/Clang from aggressively inlining constant values and not requiring volatile incantations to prevent those. This patch enables global variables. It still disables uninitialized variables, which will be put into special COM (common) ELF section, because BPF doesn't allow uninitialized data to be accessed. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20191121070743.1309473-5-andriin@fb.com
2019-10-17selftests/bpf: Make CO-RE reloc test impartial to test_progs flavorAndrii Nakryiko1-1/+2
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
2019-10-08selftests/bpf: Add BPF_CORE_READ and BPF_CORE_READ_STR_INTO macro testsAndrii Nakryiko1-1/+53
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
2019-10-08libbpf: Add BPF_CORE_READ/BPF_CORE_READ_INTO helpersAndrii Nakryiko1-0/+1
Add few macros simplifying BCC-like multi-level probe reads, while also emitting CO-RE relocations for each read. 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/20191008175942.1769476-7-andriin@fb.com
2019-10-08selftests/bpf: Adjust CO-RE reloc tests for new bpf_core_read() macroAndrii Nakryiko1-2/+4
To allow adding a variadic BPF_CORE_READ macro with slightly different syntax and semantics, define CORE_READ in CO-RE reloc tests, which is a thin wrapper around low-level bpf_core_read() macro, which in turn is just a wrapper around bpf_probe_read(). 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/20191008175942.1769476-4-andriin@fb.com
2019-08-07selftests/bpf: add CO-RE relocs testing setupAndrii Nakryiko1-0/+36
Add CO-RE relocation test runner. Add one simple test validating that libbpf's logic for searching for kernel image and loading BTF out of it works. 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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