KernelSU for Samsung A15 4G

• 🔐 KernelSU / KernelSU Next / ReSukiSU: Kernel-based root solutions for Android GKI devices that grant root to userspace apps directly from kernel space (one per branch; main ships without root)
• 🥷 SUSFS: An addon root hiding kernel patches and userspace module for KernelSU (ReSukiSU ships its own built-in SUSFS hooks)
• 🛡️ BBG: LSM-based Baseband Guard security to protect critical device partitions
• 🖧 BBRv3: Improved TCP congestion control
• ⚡️ TMPFS XATTR / POSIX ACL: Extended TMPFS support for meta modules and Mountify
• </> Unicode Bypass Fix: Prevent path traversal and other detections using non-printable Unicode codepoints
• 🖥️ Droidspaces Support: Support Portable Linux containers to run full Linux environments.
• 🔃 NTSync: Provide high-performance, low-latency synchronization primitives compatible with the Windows NT kernel API

• 🩹 Kernel Patches
• ⚡ Kernel Flasher

• 📱 Samsung Galaxy A15 4G (SM-A155F) only. Do not flash this on the A15 5G (SM-A156x) or any other model.
• 🔓 Unlocked bootloader (OEM unlocking enabled).
• 🧾 Matching firmware: current releases are built for A155FXXS7CYG1 / A155FXXS7CYG4. The firmware is part of every release name, so compare it with your build number before flashing.
• 💾 A copy of your stock boot.img (from your firmware's AP file) so you can always go back.

1. Grab the .tar for your variant from the Releases page. Releases for all branches are listed together, so use the tag prefix from the table above to pick the right one.
2. Flash it:
   • Not rooted yet: flash the .tar in Odin's AP slot (or extract boot.img and flash it with Heimdall).
   • Already rooted: extract boot.img from the .tar and flash it with Kernel Flasher (recommended).
3. Reboot, then install the matching manager app (KernelSU, KernelSU Next or ReSukiSU).

↩️ Going back: flash your stock boot.img the same way to return to the stock kernel.

For devs / advanced users who want to compile the kernel themselves instead of using the prebuilt release.

(Ubuntu/Debian — matches the CI environment)

sudo apt-get update
sudo apt-get install -y bc bison build-essential ccache ca-certificates clang curl flex \
  gcc-aarch64-linux-gnu gcc-arm-linux-gnueabi git libelf-dev libssl-dev lld llvm make \
  python3 rsync unzip wget zip zstd lz4
pip3 install telethon   # optional: only needed for the Telegram release bot

# Pick ONE: kernelsu | kernelsunext | resukisu | main (stock optimized, no root)
git clone --branch resukisu https://github.com/poqdavid/android_kernel_samsung_sma155f.git
cd android_kernel_samsung_sma155f

chmod +x build.sh
chmod +x scripts/repack

./build.sh --ksu -j$(nproc)        # KernelSU
./build.sh --ksun -j$(nproc)       # KernelSU Next
./build.sh --resukisu -j$(nproc)   # ReSukiSU
./build.sh -j$(nproc)              # no variant flag = stock optimized (no root)

The script auto-detects your kernel/Android version, applies the Samsung/security config tweaks, BBG, BBRv3, SUSFS, and all the optimization patches before invoking the actual kernel build.

The repo already ships the stock boot image the releases are built against (repackfiles/boot.img.lz4), and scripts/repack decompresses it automatically. To repack against a different firmware, replace repackfiles/boot.img.lz4 with your own stock boot image (or delete it and put a plain boot.img in repackfiles/; a plain boot.img gets overwritten while boot.img.lz4 is present).

# Use the SAME variant flag you built with (--ksu / --ksun / --resukisu, or none for stock)
./scripts/repack --resukisu

# Add --vbm to also include vbmeta.img.lz4 in the .tar
./scripts/repack --resukisu --vbm

This unpacks the stock boot.img, swaps in the freshly built kernel Image, re-signs it with a generated AVB key, and packages the result.

Output: release/<kernelsu|kernelsunext|resukisu>_<ksu_version>_susfs_<susfs_version>_A155FXXS7CYG4_A15_GKI.tar (or release/stock_optimized_<kernel_version>_A155FXXS7CYG4_A15_GKI.tar) containing boot.img, plus vbmeta.img.lz4 when --vbm is used.

ℹ️ lz4 and python3 must be installed for this step — magiskboot, ksud, and avbtool are already bundled in scripts/bin.

Follow the 📋 Installation Instructions above to flash your freshly built boot.img.

If you encounter any issues or need help, feel free to:

• 🐛 Open an issue in this repository
• 💬 Reach out to me on Telegram

When reporting a problem, please include the release tag you flashed, your firmware build number, and a log (dmesg / logcat) if you can get one.

Flashing this kernel will void your warranty, and there is always a risk of bricking your device. Please make sure to:

• 💾 Back up your data
• 🧠 Understand the risks before proceeding

🚨 Proceed at your own risk!

The kernel source is licensed under GPL-2.0 (see COPYING and LICENSE). Build and repack scripts carry their own SPDX license headers.

📱 Contacts

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🌟 Special Thanks

These amazing people help make this project possible! ❤️

🔧 Project	👨‍💻 Developer	🔗 Link
KernelSU	tiann
KernelSU-Next	rifsxd
ReSukiSU	ReSukiSU
Magic-KSU	5ec1cff
SUSFS	simonpunk
SUSFS Module	sidex15
ReeViiS69	ReeViiS69
fei-ke	fei-ke
pershoot	pershoot
jimsterino98	jimsterino98
Baseband Guard	vc-teahouse
Droidspaces	ravindu644
KKdemergencia	KKdemergencia

🙏 Special thanks to the open-source community for their contributions!

If you have contributed and are not listed here, please remind me! 🙏

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💝 Donations

Any and all donations are appreciated!

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