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Date: Mon, 06 Nov 2017 10:56:50 +0100
From: Takashi Iwai <tiwai@...e.de>
To: "Andrey Konovalov" <andreyknvl@...gle.com>
Cc: <alsa-devel@...a-project.org>, "Arnd Bergmann" <arnd@...db.de>,
"Arvind Yadav" <arvind.yadav.cs@...il.com>,
"Dave Jiang" <dave.jiang@...el.com>,
"Johan Hovold" <johan@...nel.org>,
"Mauro Carvalho Chehab" <mchehab@...nel.org>,
"Andrew Morton" <akpm@...ux-foundation.org>,
"Jaroslav Kysela" <perex@...ex.cz>,
"Markus Elfring" <elfring@...rs.sourceforge.net>,
"LKML" <linux-kernel@...r.kernel.org>,
"Dmitry Vyukov" <dvyukov@...gle.com>,
"Kostya Serebryany" <kcc@...gle.com>,
"syzkaller" <syzkaller@...glegroups.com>
Subject: Re: usb/sound/usx2y: WARNING in usb_stream_start
On Fri, 03 Nov 2017 20:52:49 +0100,
Takashi Iwai wrote:
>
> On Fri, 03 Nov 2017 15:44:59 +0100,
> Andrey Konovalov wrote:
> >
> > Hi!
> >
> > I've got the following report while fuzzing the kernel with syzkaller.
> >
> > On commit 3a99df9a3d14cd866b5516f8cba515a3bfd554ab (4.14-rc7+).
> >
> > Looks like there's no check for the actual endpoint types.
> >
> > usb 1-1: BOGUS urb xfer, pipe 0 != type 3
> > ------------[ cut here ]------------
> > WARNING: CPU: 0 PID: 24 at drivers/usb/core/urb.c:471
> > usb_submit_urb+0x113e/0x1400
> > Modules linked in:
> > CPU: 0 PID: 24 Comm: kworker/0:1 Not tainted
> > 4.14.0-rc7-44290-gf28444df2601-dirty #52
> > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> > Workqueue: usb_hub_wq hub_event
> > task: ffff88006bef5c00 task.stack: ffff88006bf60000
> > RIP: 0010:usb_submit_urb+0x113e/0x1400 drivers/usb/core/urb.c:470
> > RSP: 0018:ffff88006bf67440 EFLAGS: 00010286
> > RAX: 0000000000000029 RBX: ffff880064698c80 RCX: ffffffff812495b5
> > RDX: 0000000000000000 RSI: ffffffff8124d76a RDI: 0000000000000005
> > RBP: ffff88006bf674b0 R08: ffff88006bef5c00 R09: 0000000000000006
> > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
> > R13: 0000000000000003 R14: ffff880069a25a20 R15: ffff880064698d04
> > FS: 0000000000000000(0000) GS:ffff88006ca00000(0000) knlGS:0000000000000000
> > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: 00007fe6fdba3000 CR3: 0000000068470000 CR4: 00000000000006f0
> > Call Trace:
> > usb_stream_start+0x48a/0x9f0 sound/usb/usx2y/usb_stream.c:690
> > us122l_start+0x116/0x290 sound/usb/usx2y/us122l.c:365
> (snip)
>
> OK, so this looks like another typical issue.
> A totally untested patch is below. Could you check whether it covers?
FYI, below is the patch with a proper description that I queued to
for-next branch.
Takashi
-- 8< --
From: Takashi Iwai <tiwai@...e.de>
Subject: [PATCH] ALSA: usx2y: Fix invalid stream URBs
The us122l driver creates URBs per the fixed endpoints, and this may
end up with URBs with inconsistent pipes when a fuzzer or a malicious
program deals with the manipulated endpoints. It ends up with a
kernel warning like:
usb 1-1: BOGUS urb xfer, pipe 0 != type 3
------------[ cut here ]------------
WARNING: CPU: 0 PID: 24 at drivers/usb/core/urb.c:471
usb_submit_urb+0x113e/0x1400
Call Trace:
usb_stream_start+0x48a/0x9f0 sound/usb/usx2y/usb_stream.c:690
us122l_start+0x116/0x290 sound/usb/usx2y/us122l.c:365
us122l_create_card sound/usb/usx2y/us122l.c:502
us122l_usb_probe sound/usb/usx2y/us122l.c:588
....
For avoiding the bad access, this patch adds a few sanity checks of
the validity of created URBs like previous similar fixes using the new
usb_urb_ep_type_check() helper function.
Reported-by: Andrey Konovalov <andreyknvl@...gle.com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
---
sound/usb/usx2y/usb_stream.c | 23 +++++++++++++++++------
1 file changed, 17 insertions(+), 6 deletions(-)
diff --git a/sound/usb/usx2y/usb_stream.c b/sound/usb/usx2y/usb_stream.c
index e229abd21652..b0f8979ff2d2 100644
--- a/sound/usb/usx2y/usb_stream.c
+++ b/sound/usb/usx2y/usb_stream.c
@@ -56,7 +56,7 @@ static void playback_prep_freqn(struct usb_stream_kernel *sk, struct urb *urb)
lb, s->period_size);
}
-static void init_pipe_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
+static int init_pipe_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
struct urb **urbs, char *transfer,
struct usb_device *dev, int pipe)
{
@@ -77,6 +77,8 @@ static void init_pipe_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
urb->interval = 1;
if (usb_pipeout(pipe))
continue;
+ if (usb_urb_ep_type_check(urb))
+ return -EINVAL;
urb->transfer_buffer_length = transfer_length;
desc = urb->iso_frame_desc;
@@ -87,9 +89,11 @@ static void init_pipe_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
desc[p].length = maxpacket;
}
}
+
+ return 0;
}
-static void init_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
+static int init_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
struct usb_device *dev, int in_pipe, int out_pipe)
{
struct usb_stream *s = sk->s;
@@ -103,9 +107,12 @@ static void init_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
sk->outurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL);
}
- init_pipe_urbs(sk, use_packsize, sk->inurb, indata, dev, in_pipe);
- init_pipe_urbs(sk, use_packsize, sk->outurb, sk->write_page, dev,
- out_pipe);
+ if (init_pipe_urbs(sk, use_packsize, sk->inurb, indata, dev, in_pipe) ||
+ init_pipe_urbs(sk, use_packsize, sk->outurb, sk->write_page, dev,
+ out_pipe))
+ return -EINVAL;
+
+ return 0;
}
@@ -226,7 +233,11 @@ struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk,
else
sk->freqn = get_usb_high_speed_rate(sample_rate);
- init_urbs(sk, use_packsize, dev, in_pipe, out_pipe);
+ if (init_urbs(sk, use_packsize, dev, in_pipe, out_pipe) < 0) {
+ usb_stream_free(sk);
+ return NULL;
+ }
+
sk->s->state = usb_stream_stopped;
out:
return sk->s;
--
2.14.3
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