Linux-USB Archive on lore.kernel.org
 help / color / Atom feed
From: Oliver Neukum <oneukum@suse.com>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
	steve_bayless@keysight.com,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	guido.kiener@rohde-schwarz.com,
	syzbot <syzbot+55b0304b360654a7537b@syzkaller.appspotmail.com>,
	USB list <linux-usb@vger.kernel.org>
Subject: Re: divide error in usbtmc_generic_read
Date: Mon, 19 Aug 2019 15:49:01 +0200
Message-ID: <1566222541.5663.27.camel@suse.com> (raw)
In-Reply-To: <CAAeHK+wGzWGvW0AVSr6qA+AcpLr7A3Xi8wR7f-rBQJmMmQgU2A@mail.gmail.com>

Am Montag, den 19.08.2019, 15:18 +0200 schrieb Andrey Konovalov:
> On Mon, Aug 19, 2019 at 3:09 PM Oliver Neukum <oneukum@suse.com> wrote:
> > 
> > Am Montag, den 19.08.2019, 14:43 +0200 schrieb Andrey Konovalov:
> > > On Mon, Aug 19, 2019 at 2:37 PM Oliver Neukum <oneukum@suse.com> wrote:
> > > > The original error was a divide by zero. The first fix fixed that
> > > > but still another error showed up. If I propose a fix there are
> > > > other possibilities besides it working.
> > > > 
> > > > I could have no effect on the original bug or my fix breaks
> > > > something else and KASAN is making no difference between
> > > > those cases.
> > > 
> > > I think you mean syzbot here and not KASAN. Do I understand correctly,
> > > that you're saying that the original report was
> > 
> > Yes, sorry syzbot.
> > 
> > > divide-by-zero, but
> > > when you requested to test the patch the reproducer triggered a
> > > use-after-free, and syzbot didn't treat the patch you provided as a
> > > correct fix?
> > 
> > No, obviously there is still a bug. What I would like syzbot to have
> > would be a third category: inconclusive.
> > Seeing another bug instead may also mean the first bug struck
> > before the second could ever happen. We just lack data to tell.
> 
> OK, I see. The exact words that syzbot uses in this case are "syzbot
> has tested the proposed patch but the reproducer still triggered
> crash". What would you like to see instead?
> 

"syzbot has tested the proposed patch but the reproducer triggered
another crash" would make it clearer.

	Regards
		Oliver


  reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-14 11:38 syzbot
2019-08-14 13:25 ` Oliver Neukum
2019-08-14 13:38   ` syzbot
2019-08-14 13:52     ` Andrey Konovalov
2019-08-15 13:31     ` Oliver Neukum
2019-08-19 12:17       ` Andrey Konovalov
2019-08-19 12:37         ` Oliver Neukum
2019-08-19 12:43           ` Andrey Konovalov
2019-08-19 13:09             ` Oliver Neukum
2019-08-19 13:18               ` Andrey Konovalov
2019-08-19 13:49                 ` Oliver Neukum [this message]
2019-08-19 15:40                   ` Andrey Konovalov
2019-08-20  9:01                     ` Oliver Neukum
2019-08-15 14:28 ` Oliver Neukum
2019-08-15 14:48   ` syzbot

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1566222541.5663.27.camel@suse.com \
    --to=oneukum@suse.com \
    --cc=andreyknvl@google.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=guido.kiener@rohde-schwarz.com \
    --cc=linux-usb@vger.kernel.org \
    --cc=steve_bayless@keysight.com \
    --cc=syzbot+55b0304b360654a7537b@syzkaller.appspotmail.com \
    --cc=syzkaller-bugs@googlegroups.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-USB Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-usb/0 linux-usb/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-usb linux-usb/ https://lore.kernel.org/linux-usb \
		linux-usb@vger.kernel.org linux-usb@archiver.kernel.org
	public-inbox-index linux-usb

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-usb


AGPL code for this site: git clone https://public-inbox.org/ public-inbox