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

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Purpose

이 문서가 존재하는 이유

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

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Key Concepts

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

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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

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Best Practices

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

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References

• PatchELF

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Related Pages

• Linux
• Server
• Hardware
• Network

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Knowledge Graph

Related

→ Linux → Server → Hardware → Network