aeondave/patchelf
offensive-tools/rev/patchelf/SKILL.md
patchelf: ELF patching utility for changing interpreters, RPATH/RUNPATH, DT_NEEDED entries, and SONAME fields. Use when redirecting a binary to a custom loader or libc, fixing packaged ELF dependencies, or preparing local exploit environments that must run against a specific runtime.
$ install --global
skillsauthnpx skillsauth add aeondave/malskill patchelfInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: May 19, 2026, 4:57 AM192.2s1 file scanned
SKILL.md
- name:
- patchelf
- description:
- patchelf: ELF patching utility for changing interpreters, RPATH/RUNPATH, DT_NEEDED entries, and SONAME fields. Use when redirecting a binary to a custom loader or libc, fixing packaged ELF dependencies, or preparing local exploit environments that must run against a specific runtime.
- license:
- GPL-3.0
- compatibility:
- Linux primary; ELF binaries and shared libraries only
- author:
- AeonDave
- version:
- 1.0
patchelf
Patch existing ELF metadata without recompiling the target.
When to use patchelf
Use patchelf when you need to:
- force an ELF to use a specific dynamic loader
- point a binary at a custom libc or bundled libraries
- trim or rewrite RPATH/RUNPATH entries
- add, remove, or replace
DT_NEEDEDdependencies - change a shared library
SONAME
This is especially useful in exploit labs, portable bundles, and offline ELF repair workflows.
Quick Start
# Set custom loader
patchelf --set-interpreter /lib64/ld-linux-x86-64.so.2 ./prog
# Set custom RPATH
patchelf --set-rpath '$ORIGIN/libs' ./prog
# Replace one needed library with another
patchelf --replace-needed libold.so libnew.so ./prog
High-Value Operations
Change interpreter
patchelf --set-interpreter /path/to/ld-linux.so.2 ./prog
Use when a binary must run with a matching loader for a bundled libc.
Set or shrink RPATH
patchelf --set-rpath /opt/app/lib:/other/lib ./prog
patchelf --shrink-rpath ./prog
patchelf --shrink-rpath --allowed-rpath-prefixes /usr/lib:/opt/app/lib ./prog
Change dependencies
patchelf --remove-needed libfoo.so.1 ./prog
patchelf --add-needed libbar.so.1 ./prog
patchelf --replace-needed libold.so.1 libnew.so.1 ./prog
Change shared library SONAME
patchelf --set-soname libcustom.so.1 ./libtarget.so
Canonical Exploit-Lab Workflow
cp ./vuln ./vuln.patched
patchelf --set-interpreter ./ld-linux-x86-64.so.2 ./vuln.patched
patchelf --set-rpath '$ORIGIN' ./vuln.patched
Then verify with ldd, readelf, or by executing under a controlled directory.
Practical Notes
- Always patch a copy first.
- Verify before and after with
readelf -l,readelf -d, andldd. - Prefer
$ORIGIN-based RPATHs for portable bundles. - Use patchelf for loader/runtime metadata, not for arbitrary code patching.
Caveats
- ELF only.
- Bad interpreter or dependency changes can make the binary unloadable.
- Patching dependency layout does not fix ABI mismatches by itself.
Resources
No bundled scripts/, references/, or assets/.
Use upstream README for build/install variants and the complete option set.
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