PatchELF

Overview

PatchELF에 대한 기술 문서입니다.

Summary

• 무엇인가? - PatchELF
• 왜 필요한가? - HPC 및 서버 환경에서 필수 개념
• 언제 사용하는가? - 서버 구성, 성능 튜닝, 문제 해결 시

Purpose

이 문서가 존재하는 이유

• Goal: PatchELF에 대한 기술 정보 제공
• Scope: PatchELF의 개념, 사용법, 설정
• Non-goals: 다른 주제로의 확장

Key Concepts

Concept	Description	Related
PatchELF	HPC/서버 환경에서 중요한 기술 개념	Linux, Server

Detailed Explanation

What if an application binary app uses glibc version 2.22 and you need to configure it to use glibc 2.25 without recompiling the binary ? PatchELF comes to play with it. PatchELF is a simple utility for modifying existing ELF executables and libraries. In particular, it can do the following: . * Change the dynamic loader ("ELF interpreter") of executables * Change the RPATH of executables and libraries * Remove declared dependencies on dynamic libraries (DT_NEEDED entries)

sudo apt update
sudo apt install patchelf

$ patchelf --set-interpreter /lib/my-ld-linux.so.2 my-program

$ patchelf --set-rpath /opt/my-libs/lib:/other-libs my-program

$ patchelf --shrink-rpath my-program

This removes from the RPATH all directories that do not contain a library referenced by DT_NEEDED fields of the executable or library. For instance, if an executable references one library libfoo.so, has an RPATH /lib:/usr/lib:/foo/lib, and libfoo.so can only be found in /foo/lib, then the new RPATH will be /foo/lib. In addition, the --allowed-rpath-prefixes option can be used for further rpath tuning. For instance, if an executable has an RPATH /tmp/build-foo/.libs:/foo/lib, it is probably desirable to keep the /foo/lib reference instead of the /tmp entry. To accomplish that, use:

$ patchelf --shrink-rpath --allowed-rpath-prefixes /usr/lib:/foo/lib my-program

$ patchelf --remove-needed libfoo.so.1 my-program

This option can be given multiple times.

$ patchelf --add-needed libfoo.so.1 my-program

This option can be give multiple times.

$ patchelf --replace-needed liboriginal.so.1 libreplacement.so.1 my-program

This option can be give multiple times.

$ patchelf --set-soname libnewname.so.3.4.5 path/to/libmylibrary.so.1.2.3

https://manpages.ubuntu.com/manpages/bionic/man1/patchelf.1.html https://anaconda.org/conda-forge/patchelf

Best Practices

• 최신 버전 사용 권장
• 공식 문서 참고
• 테스트 환경에서 먼저 검증

References

• PatchELF

Related Pages

• Linux
• Server
• Hardware
• Network

Knowledge Graph

Related

→ Linux → Server → Hardware → Network