termux-elf-cleaner

Utility for Android ELF files to remove unused parts that the linker warns about.

Description

When loading ELF files, the Android linker warns about unsupported dynamic section entries with warnings such as:

WARNING: linker: /data/data/org.kost.nmap.android.networkmapper/bin/nmap: unused DT entry: type 0x6ffffffe arg 0x8a7d4
WARNING: linker: /data/data/org.kost.nmap.android.networkmapper/bin/nmap: unused DT entry: type 0x6fffffff arg 0x3

This utility strips away the following dynamic section entries:

• DT_RPATH - not supported in any Android version.
• DT_RUNPATH - supported from Android 7.0.
• DT_VERDEF - supported from Android 6.0.
• DT_VERDEFNUM - supported from Android 6.0.
• DT_VERNEEDED - supported from Android 6.0.
• DT_VERNEEDNUM - supported from Android 6.0.
• DT_VERSYM - supported from Android 6.0.

It also removes the three ELF sections of type:

• SHT_GNU_verdef
• SHT_GNU_verneed
• SHT_GNU_versym

Usage

usage: termux-elf-cleaner <filenames>

Processes ELF files to remove unsupported section types and
dynamic section entries which the Android linker warns about.

Author

Fredrik Fornwall (@fornwall).

License

SPDX-License-Identifier: GPL-3.0-or-later