linux-kernel - Re: [PATCH] usb: mon: make mmapped memory read only

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Message-ID: <69ddd90e-91fa-78d7-63e6-9d6a8036c6b5@linaro.org>
Date:   Fri, 16 Sep 2022 21:14:11 -0700
From:   Tadeusz Struk <tadeusz.struk@...aro.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] usb: mon: make mmapped memory read only

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@...r.kernel.org
> Cc:linux-kernel@...r.kernel.org
> Cc:stable@...r.kernel.org
> Fixes: 6f23ee1fefdc ("USB: add binary API to usbmon")
> Link:https://syzkaller.appspot.com/bug?id=2eb1f35d6525fa4a74d75b4244971e5b1411c95a
> Signed-off-by: Tadeusz Struk<tadeusz.struk@...aro.org>

I forgot to add:
Reported-by: syzbot+23f57c5ae902429285d7@...kaller.appspotmail.com

-- 
Thanks,
Tadeusz