Libbpf v1.2 has been released ([0])! It's been about 4 months since libbpf v1.1 release, and it feels like this is the right time to cut another one. This release is a healthy mix of new features on both user space and BPF side of libbpf, coupled with a bunch of bug fixes and improvements to existing APIs and features. There are exciting improvements to libbpf documentation as well, but more documentation contributions are always welcome! A big thank you goes to all the contributors that are constantly making libbpf a better BPF loader library! Please find the summary of libbpf v1.2 changes below. ## User space-side features and APIs: - completely overhauled ["Libbpf overview"](https://libbpf.readthedocs.io/en/latest/libbpf_overview.html) landing documentation page; - support attaching to uprobes/uretprobes to functions defined in Android APK archives; - support for BPF link-based `struct_ops` programs: - `SEC(".struct_ops.link")` annotations; - `bpf_map__attach_struct_ops()` attach API; - `bpf_link__update_map()` link update API; - support sleepable `SEC("struct_ops.s")` programs; - improved thread-safety of libbpf print callbacks and `libbpf_set_print()`; - improve handling and reporting of missing BPF kfuncs; - `bpf_{btf,link,map,prog}_get_info_by_fd()` APIs; - `bpf_xdp_query_opts()` supports fetching XDP/XSK supported features; - `perf_buffer__new()` allows customizing notification/sampling period now; - BPF verifier logging improvements: - pass-through BPF verifier log level and flags to kernel as is; - support `log_true_size` for getting required log buffer size to fit BPF verifier log completely; - allow precise control over kprobe/uprobe attach mode: legacy, perf-based, link-based. ## BPF-side features and APIs; - support for BPF open-coded iterators: `bpf_for()`, `bpf_repeat()`, `bpf_for_each()`; - `bpf_ksym_exists()` macro to check existence of ksyms/kfuncs and kconfig values; - `BPF_UPROBE()` and `BPF_URETPROBE()` macros; - `BPF_KPROBE()` and `BPF_UPROBE()` macros allow fetching up to 8 passed in registers arguments, depending on architecture support; - `BPF_KSYSCALL()` supports fetching all 6 syscall arguments now; - LoongArch support in bpf_tracing.h; - USDT support for 32-bit ARM architecture. ## Bug fixes - fix legacy kprobe events names sanitization; - fix clobbering errno in some cases; - fix BPF map's `BPF_F_MMAPABLE` flag sanitization; - fix BPF-side USDT support code on s390x architecture; - fix `BPF_PROBE_READ{_STR}_INTO()` on s390x architecture; - fix kernel version setting for Debian kernels; - fix netlink protocol handling in some cases; - improve robustness of attaching to legacy kprobes and uprobes; - fix double-free during static linking empty ELF sections; - a bunch of other small fixes here and there. [0] https://github.com/libbpf/libbpf/releases/tag/v1.2.0 [1] Full Changelog: https://github.com/libbpf/libbpf/compare/v1.1.0...v1.2.0 -- Andrii
