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Date: Tue, 29 Dec 2020 08:33:39 -0800
From: syzbot <syzbot+5925509f78293baa7331@...kaller.appspotmail.com>
To: Alan Stern <stern@...land.harvard.edu>
Cc: andreyknvl@...il.com, andreyknvl@...gle.com, balbi@...nel.org,
gregkh@...uxfoundation.org, gustavoars@...nel.org,
linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
stern@...land.harvard.edu, syzkaller-bugs@...glegroups.com
Subject: Re: Re: UBSAN: shift-out-of-bounds in dummy_hub_control
> On Fri, Dec 25, 2020 at 12:05:22PM -0800, syzbot wrote:
>> Hello,
>>
>> syzbot found the following issue on:
>>
>> HEAD commit: e37b12e4 Merge tag 'for-linus-5.11-ofs1' of git://git.kern..
>> git tree: upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=17429937500000
>> kernel config: https://syzkaller.appspot.com/x/.config?x=98408202fed1f636
>> dashboard link: https://syzkaller.appspot.com/bug?extid=5925509f78293baa7331
>> compiler: gcc (GCC) 10.1.0-syz 20200507
>> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1781fc5b500000
>> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=157cd123500000
>>
>> The issue was bisected to:
>>
>> commit 8442b02bf3c6770e0d7e7ea17be36c30e95987b6
>> Author: Andrey Konovalov <andreyknvl@...gle.com>
>> Date: Mon Oct 21 14:20:58 2019 +0000
>>
>> USB: dummy-hcd: increase max number of devices to 32
>>
>> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1631d0db500000
>> final oops: https://syzkaller.appspot.com/x/report.txt?x=1531d0db500000
>> console output: https://syzkaller.appspot.com/x/log.txt?x=1131d0db500000
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+5925509f78293baa7331@...kaller.appspotmail.com
>> Fixes: 8442b02bf3c6 ("USB: dummy-hcd: increase max number of devices to 32")
>>
>> ================================================================================
>> UBSAN: shift-out-of-bounds in drivers/usb/gadget/udc/dummy_hcd.c:2293:33
>> shift exponent 257 is too large for 32-bit type 'int'
>> CPU: 0 PID: 8526 Comm: syz-executor949 Not tainted 5.10.0-syzkaller #0
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
>> Call Trace:
>> __dump_stack lib/dump_stack.c:79 [inline]
>> dump_stack+0x107/0x163 lib/dump_stack.c:120
>> ubsan_epilogue+0xb/0x5a lib/ubsan.c:148
>> __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:395
>> dummy_hub_control.cold+0x1a/0xbc drivers/usb/gadget/udc/dummy_hcd.c:2293
>> rh_call_control drivers/usb/core/hcd.c:683 [inline]
>> rh_urb_enqueue drivers/usb/core/hcd.c:841 [inline]
>> usb_hcd_submit_urb+0xcaa/0x22d0 drivers/usb/core/hcd.c:1544
>> usb_submit_urb+0x6e4/0x1560 drivers/usb/core/urb.c:585
>> usb_start_wait_urb+0x101/0x4c0 drivers/usb/core/message.c:58
>> usb_internal_control_msg drivers/usb/core/message.c:102 [inline]
>> usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:153
>> do_proc_control+0x4cb/0x9c0 drivers/usb/core/devio.c:1165
>> proc_control drivers/usb/core/devio.c:1191 [inline]
>> usbdev_do_ioctl drivers/usb/core/devio.c:2535 [inline]
>> usbdev_ioctl+0x12c1/0x3b20 drivers/usb/core/devio.c:2708
>> vfs_ioctl fs/ioctl.c:48 [inline]
>> __do_sys_ioctl fs/ioctl.c:753 [inline]
>> __se_sys_ioctl fs/ioctl.c:739 [inline]
>> __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
>> do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
>> entry_SYSCALL_64_after_hwframe+0x44/0xa9
>> RIP: 0033:0x443f29
>> Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb d7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
>> RSP: 002b:00007ffc10df4328 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
>> RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443f29
>> RDX: 0000000020000000 RSI: 00000000c0185500 RDI: 0000000000000003
>> RBP: 00000000006ce018 R08: 0000000000000000 R09: 00000000004002e0
>> R10: 000000000000000f R11: 0000000000000246 R12: 0000000000401bb0
>> R13: 0000000000401c40 R14: 0000000000000000 R15: 0000000000000000
>> ================================================================================
>
> The cause is pretty obvious. dummy-hcd assumes that requests sent to
> the root hub are always valid, which isn't always true when they come
> from userspace.
>
> Alan Stern
>
> #syz test: upstream e37b12e4
"upstream" does not look like a valid git repo address.
>
> Index: usb-devel/drivers/usb/gadget/udc/dummy_hcd.c
> ===================================================================
> --- usb-devel.orig/drivers/usb/gadget/udc/dummy_hcd.c
> +++ usb-devel/drivers/usb/gadget/udc/dummy_hcd.c
> @@ -2114,9 +2114,21 @@ static int dummy_hub_control(
> dum_hcd->port_status &= ~USB_PORT_STAT_POWER;
> set_link_state(dum_hcd);
> break;
> - default:
> + case USB_PORT_FEAT_ENABLE:
> + case USB_PORT_FEAT_C_ENABLE:
> + case USB_PORT_FEAT_C_SUSPEND:
> + /* Not allowed for USB-3 */
> + if (hcd->speed == HCD_USB3)
> + goto error;
> + fallthrough;
> + case USB_PORT_FEAT_C_CONNECTION:
> + case USB_PORT_FEAT_C_RESET:
> dum_hcd->port_status &= ~(1 << wValue);
> set_link_state(dum_hcd);
> + break;
> + default:
> + /* Disallow INDICATOR and C_OVER_CURRENT */
> + goto error;
> }
> break;
> case GetHubDescriptor:
> @@ -2277,18 +2289,17 @@ static int dummy_hub_control(
> */
> dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
> fallthrough;
> + case USB_PORT_FEAT_C_CONNECTION:
> + case USB_PORT_FEAT_C_RESET:
> + case USB_PORT_FEAT_C_ENABLE:
> + case USB_PORT_FEAT_C_SUSPEND:
> + /* Not allowed for USB-3, and ignored for USB-2 */
> + if (hcd->speed == HCD_USB3)
> + goto error;
> + break;
> default:
> - if (hcd->speed == HCD_USB3) {
> - if ((dum_hcd->port_status &
> - USB_SS_PORT_STAT_POWER) != 0) {
> - dum_hcd->port_status |= (1 << wValue);
> - }
> - } else
> - if ((dum_hcd->port_status &
> - USB_PORT_STAT_POWER) != 0) {
> - dum_hcd->port_status |= (1 << wValue);
> - }
> - set_link_state(dum_hcd);
> + /* Disallow TEST, INDICATOR, and C_OVER_CURRENT */
> + goto error;
> }
> break;
> case GetPortErrorCount:
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