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https://github.com/termux/termux-elf-cleaner
Utility to remove unused ELF sections causing warnings.
https://github.com/termux/termux-elf-cleaner
android elf elf-sections termux
Last synced: 1 day ago
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Utility to remove unused ELF sections causing warnings.
- Host: GitHub
- URL: https://github.com/termux/termux-elf-cleaner
- Owner: termux
- License: gpl-3.0
- Created: 2017-04-04T20:37:15.000Z (over 7 years ago)
- Default Branch: master
- Last Pushed: 2024-04-05T05:22:45.000Z (9 months ago)
- Last Synced: 2024-04-13T21:41:30.120Z (9 months ago)
- Topics: android, elf, elf-sections, termux
- Language: C
- Size: 8.56 MB
- Stars: 203
- Watchers: 24
- Forks: 57
- Open Issues: 4
-
Metadata Files:
- Readme: README.md
- License: COPYING
Awesome Lists containing this project
README
# 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_GNU_HASH` - supported from Android 6.0.
- `DT_RUNPATH` - supported from Android 7.0.
- `DT_VERDEF` - supported from Android 6.0.
- `DT_VERDEFNUM` - supported from Android 6.0.
- `DT_VERNEED` - supported from Android 6.0.
- `DT_VERNEEDNUM` - supported from Android 6.0.
- `DT_VERSYM` - supported from Android 6.0.
- `DT_AARCH64_BTI_PLT` - supported from Android 12.
- `DT_AARCH64_PAC_PLT` - supported from Android 12.
- `DT_AARCH64_VARIANT_PCS` - supported from Android 12.
It also removes the three ELF sections of type:
- `SHT_GNU_verdef`
- `SHT_GNU_verneed`
- `SHT_GNU_versym`
And makes sure that the alignment of a TLS segment is at least 32 (for 32bit arches) or 64 (for 64bit arches), to prevent errors similar to:
```
error: "valgrind": executable's TLS segment is underaligned: alignment is 8, needs to be at least 64 for ARM64 Bionic
```
## Usage
```
Usage: termux-elf-cleaner [OPTION-OR-FILENAME]...
Processes ELF files to remove unsupported section types and
dynamic section entries which the Android linker warns about.
Options:
--api-level NN choose target api level, i.e. 21, 24, ..
--dry-run print info but but do not remove entries
--quiet do not print info about removed entries
--help display this help and exit
--version output version information and exit
```
## License
SPDX-License-Identifier: [GPL-3.0-or-later](https://spdx.org/licenses/GPL-3.0-or-later.html)
## See also
* [Bionic's related docs](https://android.googlesource.com/platform/bionic/+/refs/heads/master/android-changes-for-ndk-developers.md)