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由 Andrii Nakryiko 提交于
mainline inclusion from mainline-5.16-rc1 commit ad23b723 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I5EUVD CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad23b7238474c6319bf692ae6ce037d9696df1d1 ------------------------------------------------- Minimize the usage of class-agnostic gelf_xxx() APIs from libelf. These APIs require copying ELF data structures into local GElf_xxx structs and have a more cumbersome API. BPF ELF file is defined to be always 64-bit ELF object, even when intended to be run on 32-bit host architectures, so there is no need to do class-agnostic conversions everywhere. BPF static linker implementation within libbpf has been using Elf64-specific types since initial implementation. Add two simple helpers, elf_sym_by_idx() and elf_rel_by_idx(), for more succinct direct access to ELF symbol and relocation records within ELF data itself and switch all the GElf_xxx usage into Elf64_xxx equivalents. The only remaining place within libbpf.c that's still using gelf API is gelf_getclass(), as there doesn't seem to be a direct way to get underlying ELF bitness. No functional changes intended. Signed-off-by: NAndrii Nakryiko <andrii@kernel.org> Signed-off-by: NAlexei Starovoitov <ast@kernel.org> Acked-by: NSong Liu <songliubraving@fb.com> Link: https://lore.kernel.org/bpf/20211021014404.2635234-4-andrii@kernel.org (cherry picked from commit ad23b723) Signed-off-by: NWang Yufen <wangyufen@huawei.com>
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