kernel/linux.git/tools/lib/bpf, branch v5.18.2

Merge tag 'kbuild-v5.18-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

2022-03-31T18:59:03+00:00

Pull Kbuild updates from Masahiro Yamada: - Add new environment variables, USERCFLAGS and USERLDFLAGS to allow additional flags to be passed to user-space programs. - Fix missing fflush() bugs in Kconfig and fixdep - Fix a minor bug in the comment format of the .config file - Make kallsyms ignore llvm's local labels, .L* - Fix UAPI compile-test for cross-compiling with Clang - Extend the LLVM= syntax to support LLVM= form for using a particular version of LLVm, and LLVM= form for using custom LLVM in a particular directory path. - Clean up Makefiles * tag 'kbuild-v5.18-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: kbuild: Make $(LLVM) more flexible kbuild: add --target to correctly cross-compile UAPI headers with Clang fixdep: use fflush() and ferror() to ensure successful write to files arch: syscalls: simplify uapi/kapi directory creation usr/include: replace extra-y with always-y certs: simplify empty certs creation in certs/Makefile certs: include certs/signing_key.x509 unconditionally kallsyms: ignore all local labels prefixed by '.L' kconfig: fix missing '# end of' for empty menu kconfig: add fflush() before ferror() check kbuild: replace $(if A,A,B) with $(or A,B) kbuild: Add environment variables for userprogs flags kbuild: unify cmd_copy and cmd_shipped

libbpf: Close fd in bpf_object__reuse_map

2022-03-21T14:36:52+00:00

pin_fd is dup-ed and assigned in bpf_map__reuse_fd. Close it in bpf_object__reuse_map after reuse. Signed-off-by: Hengqi Chen Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20220319030533.3132250-1-hengqi.chen@gmail.com

libbpf: Avoid NULL deref when initializing map BTF info

2022-03-21T01:53:04+00:00

If BPF object doesn't have an BTF info, don't attempt to search for BTF types describing BPF map key or value layout. Fixes: 262cfb74ffda ("libbpf: Init btf_{key,value}_type_id on internal map open") Signed-off-by: Andrii Nakryiko Signed-off-by: Alexei Starovoitov Acked-by: Yonghong Song Link: https://lore.kernel.org/bpf/20220320001911.3640917-1-andrii@kernel.org

libbpf: Add subskeleton scaffolding

2022-03-18T06:11:16+00:00

In symmetry with bpf_object__open_skeleton(), bpf_object__open_subskeleton() performs the actual walking and linking of maps, progs, and globals described by bpf_*_skeleton objects. Signed-off-by: Delyan Kratunov Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/6942a46fbe20e7ebf970affcca307ba616985b15.1647473511.git.delyank@fb.com

libbpf: Init btf_{key,value}_type_id on internal map open

2022-03-18T06:11:15+00:00

For internal and user maps, look up the key and value btf types on open() and not load(), so that `bpf_map_btf_value_type_id` is usable in `bpftool gen`. Signed-off-by: Delyan Kratunov Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/78dbe4e457b4a05e098fc6c8f50014b680c86e4e.1647473511.git.delyank@fb.com

libbpf: .text routines are subprograms in strict mode

2022-03-18T06:11:15+00:00

Currently, libbpf considers a single routine in .text to be a program. This is particularly confusing when it comes to library objects - a single routine meant to be used as an extern will instead be considered a bpf_program. This patch hides this compatibility behavior behind the pre-existing SEC_NAME strict mode flag. Signed-off-by: Delyan Kratunov Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/018de8d0d67c04bf436055270d35d394ba393505.1647473511.git.delyank@fb.com

libbpf: Add bpf_program__attach_kprobe_multi_opts function

2022-03-18T03:17:19+00:00

Adding bpf_program__attach_kprobe_multi_opts function for attaching kprobe program to multiple functions. struct bpf_link * bpf_program__attach_kprobe_multi_opts(const struct bpf_program *prog, const char *pattern, const struct bpf_kprobe_multi_opts *opts); User can specify functions to attach with 'pattern' argument that allows wildcards (*?' supported) or provide symbols or addresses directly through opts argument. These 3 options are mutually exclusive. When using symbols or addresses, user can also provide cookie value for each symbol/address that can be retrieved later in bpf program with bpf_get_attach_cookie helper. struct bpf_kprobe_multi_opts { size_t sz; const char **syms; const unsigned long *addrs; const __u64 *cookies; size_t cnt; bool retprobe; size_t :0; }; Symbols, addresses and cookies are provided through opts object (syms/addrs/cookies) as array pointers with specified count (cnt). Each cookie value is paired with provided function address or symbol with the same array index. The program can be also attached as return probe if 'retprobe' is set. For quick usage with NULL opts argument, like: bpf_program__attach_kprobe_multi_opts(prog, "ksys_*", NULL) the 'prog' will be attached as kprobe to 'ksys_*' functions. Also adding new program sections for automatic attachment: kprobe.multi/ kretprobe.multi/ The symbol_pattern is used as 'pattern' argument in bpf_program__attach_kprobe_multi_opts function. Signed-off-by: Jiri Olsa Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20220316122419.933957-10-jolsa@kernel.org

libbpf: Add bpf_link_create support for multi kprobes

2022-03-18T03:17:19+00:00

Adding new kprobe_multi struct to bpf_link_create_opts object to pass multiple kprobe data to link_create attr uapi. Signed-off-by: Jiri Olsa Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20220316122419.933957-9-jolsa@kernel.org

libbpf: Add libbpf_kallsyms_parse function

2022-03-18T03:17:19+00:00

Move the kallsyms parsing in internal libbpf_kallsyms_parse function, so it can be used from other places. It will be used in following changes. Signed-off-by: Jiri Olsa Signed-off-by: Alexei Starovoitov Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20220316122419.933957-8-jolsa@kernel.org

libbpf: Support batch_size option to bpf_prog_test_run

2022-03-09T22:19:22+00:00

Add support for setting the new batch_size parameter to BPF_PROG_TEST_RUN to libbpf; just add it as an option and pass it through to the kernel. Signed-off-by: Toke Høiland-Jørgensen Signed-off-by: Alexei Starovoitov Acked-by: Martin KaFai Lau Link: https://lore.kernel.org/bpf/20220309105346.100053-4-toke@redhat.com