* Re: kernel v6.7 warn in add_uevent_var: buffer size too small
[not found] <CAGXGE_JSs1iBw+EtZxsXvRrcNCmpiNFh-xFGOyzuPzXNwTatCA@mail.gmail.com>
@ 2024-12-04 9:41 ` Greg KH
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From: Greg KH @ 2024-12-04 9:41 UTC (permalink / raw)
To: wzs; +Cc: rafael, akpm, linux-kernel, stable
On Wed, Dec 04, 2024 at 05:29:26PM +0800, wzs wrote:
> Hello,
> when fuzzing the Linux kernel 6.7.0,
> the following crash was triggered.
>
> kernel config : https://pastebin.com/3JeQFdUr
> console output : https://pastebin.com/9ADtBQtP
>
> Basically, we use gadget module to simulate the connection and interaction
> process of a USB device
> (device type code : 0003, vendor id : 046D, product id : C312, serial
> number : 27B4, with function : input event).
>
> It seems to be caused by a mismatch between the uevent's environmental
> limit and the buffer size used to receive the uevent, which triggers such
> kernel warning.
>
> The crash report is as follow:
> 、、、
> [203835.102225] input: wingfuz Keyboard as
> /devices/platform/dummy_hcd.0/usb3/3-1/3-1:1.0/0003:046D:C312.27B4/input/input5893
> [203835.155527] ------------[ cut here ]------------
> [203835.155533] add_uevent_var: buffer size too small
> [203835.162092] WARNING: CPU: 11 PID: 57434 at lib/kobject_uevent.c:671
> add_uevent_var+0x2fe/0x390
I think this is already fixed in newer kernel versions. 6.7.0 is very
old and obsolete. Can you test this on 6.12.1?
thanks,
greg k-h
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