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CVE-2021-3492 PoC — Ubuntu linux kernel shiftfs file system double free vulnerability

Source
https://github.com/synacktiv/CVE-2021-3492
Associated Vulnerability
Title:Ubuntu linux kernel shiftfs file system double free vulnerability (CVE-2021-3492)
Description:Shiftfs, an out-of-tree stacking file system included in Ubuntu Linux kernels, did not properly handle faults occurring during copy_from_user() correctly. These could lead to either a double-free situation or memory not being freed at all. An attacker could use this to cause a denial of service (kernel memory exhaustion) or gain privileges via executing arbitrary code. AKA ZDI-CAN-13562.
Description
PoC for CVE-2021-3492 used at Pwn2Own 2021
File Snapshot

 [4.0K]  /data/pocs/0bd3bda9c169400fed8c9cc02dcb8065abfc988a
├── [4.0K]  attack_surface
│   ├── [1.0K]  check_syscalls.sh
│   ├── [ 13K]  result.txt
│   └── [ 625]  syscalls.py
└── [4.0K]  exploit
    ├── [ 951]  download_symbols.sh
    ├── [ 25K]  main_5.4.c
    ├── [ 22K]  main.c
    ├── [  90]  Makefile
    └── [ 106]  README.md

2 directories, 8 files
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