On 9/16/22 15:47, Tadeusz Struk wrote:
Syzbot found an issue in usbmon where it can corrupt monitor
internal memory causing the usbmon to crash with segfault,
UAF, etc. The reproducer mmaps the /dev/usbmon memory to userspace
and overwrites it with arbitrary data, which causes the issues.
To prevent that explicitly clear the VM_WRITE flag in mon_bin_mmap().
Cc:linux-usb@xxxxxxxxxxxxxxx
Cc:linux-kernel@xxxxxxxxxxxxxxx
Cc:stable@xxxxxxxxxxxxxxx
Fixes: 6f23ee1fefdc ("USB: add binary API to usbmon")
Link:https://syzkaller.appspot.com/bug?id=2eb1f35d6525fa4a74d75b4244971e5b1411c95a
Signed-off-by: Tadeusz Struk<tadeusz.struk@xxxxxxxxxx>
I forgot to add:
Reported-by: syzbot+23f57c5ae902429285d7@xxxxxxxxxxxxxxxxxxxxxxxxx
--
Thanks,
Tadeusz
