linux-kernel - Re: KMSAN: kernel-infoleak in raw

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Message-ID: <20200810074706.GD1529187@kroah.com>
Date:   Mon, 10 Aug 2020 09:47:06 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     syzbot <syzbot+a7e220df5a81d1ab400e@...kaller.appspotmail.com>
Cc:     andreyknvl@...gle.com, balbi@...nel.org, dan.carpenter@...cle.com,
        glider@...gle.com, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: KMSAN: kernel-infoleak in raw_ioctl

On Sun, Aug 09, 2020 at 09:27:18AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    ce8056d1 wip: changed copy_from_user where instrumented
> git tree:       https://github.com/google/kmsan.git master
> console output: https://syzkaller.appspot.com/x/log.txt?x=141eb8b2900000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3afe005fb99591f
> dashboard link: https://syzkaller.appspot.com/bug?extid=a7e220df5a81d1ab400e
> compiler:       clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
> userspace arch: i386
> 
> Unfortunately, I don't have any reproducer for this issue yet.

The irony of a kernel module written for syzbot testing, causing syzbot
reports....