On Fri, 10 Jul 2020 10:38:31 +0200, Takashi Iwai wrote:
On Fri, 10 Jul 2020 10:12:43 +0200, Zhang, Qiang wrote:
发件人: linux-kernel-owner@vger.kernel.org linux-kernel-owner@vger.kernel.org 代表 syzbot syzbot+c190f6858a04ea7fbc52@syzkaller.appspotmail.com 发送时间: 2020年7月9日 21:34 收件人: andreyknvl@google.com; gregkh@linuxfoundation.org; ingrassia@epigenesys.com; linux-kernel@vger.kernel.org; linux-usb@vger.kernel.org; syzkaller-bugs@googlegroups.com 主题: WARNING in submit_audio_out_urb/usb_submit_urb
Hello,
syzbot found the following crash on:
HEAD commit: 768a0741 usb: dwc2: gadget: Remove assigned but never used.. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing console output: https://syzkaller.appspot.com/x/log.txt?x=1568d11f100000 kernel config: https://syzkaller.appspot.com/x/.config?x=999be4eb2478ffa5 dashboard link: https://syzkaller.appspot.com/bug?extid=c190f6858a04ea7fbc52 compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=123aa2fb100000
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+c190f6858a04ea7fbc52@syzkaller.appspotmail.com
usb 1-1: send failed (error -32) snd_usb_toneport 1-1:0.0: Line 6 TonePort GX now attached ------------[ cut here ]------------ usb 1-1: BOGUS urb xfer, pipe 0 != type 3 WARNING: CPU: 0 PID: 12 at drivers/usb/core/urb.c:478 usb_submit_urb+0xa17/0x13e0 drivers/usb/core/urb.c:478 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.8.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events line6_startup_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xf6/0x16e lib/dump_stack.c:118 panic+0x2aa/0x6e1 kernel/panic.c:231 __warn.cold+0x20/0x50 kernel/panic.c:600 report_bug+0x1bd/0x210 lib/bug.c:198 handle_bug+0x41/0x80 arch/x86/kernel/traps.c:235 exc_invalid_op+0x13/0x40 arch/x86/kernel/traps.c:255 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:563 RIP: 0010:usb_submit_urb+0xa17/0x13e0 drivers/usb/core/urb.c:478 Code: 84 e7 04 00 00 e8 a9 10 ca fd 4c 89 ef e8 41 79 12 ff 41 89 d8 44 89 e1 4c 89 f2 48 89 c6 48 c7 c7 80 a0 5d 86 e8 db 77 9e fd <0f> 0b e8 82 10 ca fd 0f b6 6c 24 08 48 c7 c6 e0 a1 5d 86 48 89 ef RSP: 0018:ffff8881da227b10 EFLAGS: 00010086 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: ffff8881da211900 RSI: ffffffff8129b4e3 RDI: ffffed103b444f54 RBP: 0000000000000030 R08: 0000000000000001 R09: ffff8881db21fe8b R10: 0000000000000000 R11: 0000000000000004 R12: 0000000000000000 R13: ffff8881d6ecd0a0 R14: ffff8881d3d8c690 R15: ffff8881d54c4000 submit_audio_out_urb+0x6d6/0x1a00 sound/usb/line6/playback.c:271 line6_submit_audio_out_all_urbs+0xc9/0x120 sound/usb/line6/playback.c:291 line6_stream_start+0x187/0x230 sound/usb/line6/pcm.c:195 line6_pcm_acquire+0x137/0x210 sound/usb/line6/pcm.c:318 line6_startup_work+0x42/0x50 sound/usb/line6/driver.c:734 process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x392/0x470 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
It's like Alan Stern's reply to the email titled "KASAN: use-after-free Read in line6_submit_audio_in_all_urbs." It's also like a problem with asynchronous operations. can replace "cancel_delayed_work" with" cancel_delayed_work_sync" in "line6_disconnect" func？
No, this looks a different problem. It's just a matter of the missing URB type check that leads to a USB warning. A typical issue with the USB fuzzing.
I'll check it later.
... and below is the fix patch.
Takashi
-- 8< -- From: Takashi Iwai tiwai@suse.de Subject: [PATCH] ALSA: line6: Perform sanity check for each URB creation
LINE6 drivers create stream URBs with a fixed pipe without checking its validity, and this may lead to a kernel WARNING at the submission when a malformed USB descriptor is passed.
For avoiding the kernel warning, perform the similar sanity checks for each pipe type at creating a URB.
Reported-by: syzbot+c190f6858a04ea7fbc52@syzkaller.appspotmail.com Cc: stable@vger.kernel.org Signed-off-by: Takashi Iwai tiwai@suse.de --- sound/usb/line6/capture.c | 2 ++ sound/usb/line6/playback.c | 2 ++ 2 files changed, 4 insertions(+)
diff --git a/sound/usb/line6/capture.c b/sound/usb/line6/capture.c index 663d608c4287..970c9bdce0b2 100644 --- a/sound/usb/line6/capture.c +++ b/sound/usb/line6/capture.c @@ -286,6 +286,8 @@ int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm) urb->interval = LINE6_ISO_INTERVAL; urb->error_count = 0; urb->complete = audio_in_callback; + if (usb_urb_ep_type_check(urb)) + return -EINVAL; }
return 0; diff --git a/sound/usb/line6/playback.c b/sound/usb/line6/playback.c index 01930ce7bd75..8233c61e23f1 100644 --- a/sound/usb/line6/playback.c +++ b/sound/usb/line6/playback.c @@ -431,6 +431,8 @@ int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm) urb->interval = LINE6_ISO_INTERVAL; urb->error_count = 0; urb->complete = audio_out_callback; + if (usb_urb_ep_type_check(urb)) + return -EINVAL; }
return 0;