linux-kernel - Re: [syzbot] [kernel?] general protection fault in joydev

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Date:   Thu, 23 Nov 2023 08:55:08 +0000
From:   "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:     xingwei lee <xrivendell7@...il.com>
Cc:     "syzbot+786b124fe4ce4dc99357@...kaller.appspotmail.com" 
        <syzbot+786b124fe4ce4dc99357@...kaller.appspotmail.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "syzkaller-bugs@...glegroups.com" <syzkaller-bugs@...glegroups.com>
Subject: Re: [syzbot] [kernel?] general protection fault in joydev_connect

On Wed, Nov 22, 2023 at 07:55:50PM +0800, xingwei lee wrote:
> Hi. I have reproduced this bug with repro.txt and repro.c below:
> 
> repro.txt
> r0 = openat$uinput(0xffffffffffffff9c, &(0x7f0000000500), 0x802, 0x0)
> ioctl$UI_DEV_SETUP(r0, 0x405c5503, &(0x7f0000000080)={{0x0, 0xffff,
> 0x3}, 'syz0\x00'})
> ioctl$UI_DEV_CREATE(r0, 0x5501) (fail_nth: 51)

You are using fault injection, which, by it's very name, causes faults :)

Can you reproduce it without causing faults in the kernel?  And if so,
can you create a patch to fix this?

thanks,

greg k-h