linux-kernel - Re: [PATCH v7] kobject: Fix global-out-of-bounds in kobject_action

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Date:   Thu, 15 Jun 2023 09:43:34 +0800
From:   Xia Fukun <xiafukun@...wei.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     <prajnoha@...hat.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7] kobject: Fix global-out-of-bounds in
 kobject_action_type()

On 2023/6/15 4:09, Greg KH wrote:

> 
> How did you test it?  How have you verified that the previous failures
> were caught this time?
> 

My testing method is to apply the patch, compile the kernel image,
and start the QEMU virtual machine. Then compile and execute the code
mentioned in the patch that triggers out-of-bounds issues.

In addition, the following operations will be performed to verify the
functions mentioned by Peter Rajnoha <prajnoha@...hat.com>:

# echo "add fe4d7c9d-b8c6-4a70-9ef1-3d8a58d18eed A=1 B=abc" >
/sys/block/ram0/uevent

# udevadm monitor --kernel --env
monitor will print the received events for:
KERNEL - the kernel uevent

KERNEL[189.376386] add      /devices/virtual/block/ram0 (block)
ACTION=add
DEVPATH=/devices/virtual/block/ram0
SUBSYSTEM=block
SYNTH_UUID=fe4d7c9d-b8c6-4a70-9ef1-3d8a58d18eed
SYNTH_ARG_A=1
SYNTH_ARG_B=abc
DEVNAME=/dev/ram0
DEVTYPE=disk
DISKSEQ=14
SEQNUM=3781
MAJOR=1
MINOR=0

> You can understand my hesitancy here, right?
> 
> thanks,
> 
> greg k-h

I am not sure which experts can help review this patch, as I can
only find a limited number of people through the git blame command.