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* RE:  Re: divide error in usbtmc_generic_read
@ 2019-08-14 13:54 Guido Kiener
  0 siblings, 0 replies; only message in thread
From: Guido Kiener @ 2019-08-14 13:54 UTC (permalink / raw)
  To: Andrey Konovalov, syzbot
  Cc: Greg Kroah-Hartman, USB list, Oliver Neukum, steve_bayless,
	syzkaller-bugs

Hi Oliver,

Thanks for the fix. You need to set an invalid return code, too.

Regards,

Guido

-----Original Message-----
From: Andrey Konovalov <andreyknvl@google.com> 
Sent: Wednesday, August 14, 2019 3:52 PM
To: syzbot <syzbot+55b0304b360654a7537b@syzkaller.appspotmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>; Kiener Guido 1DS1 <Guido.Kiener@rohde-schwarz.com>; USB list <linux-usb@vger.kernel.org>; Oliver Neukum <oneukum@suse.com>; steve_bayless@keysight.com; syzkaller-bugs <syzkaller-bugs@googlegroups.com>
Subject: *EXT* Re: divide error in usbtmc_generic_read

On Wed, Aug 14, 2019 at 3:38 PM syzbot
<syzbot+55b0304b360654a7537b@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot has tested the proposed patch but the reproducer still 
> triggered
> crash:
> KASAN: use-after-free Read in usbtmc_disconnect

Looks like a different bug in the same driver that gets triggered by the same reproducer =)

You fix looks good to me.

>
> usb 5-1: USB disconnect, device number 2 
> ==================================================================
> BUG: KASAN: use-after-free in __mutex_lock_common
> kernel/locking/mutex.c:912 [inline]
> BUG: KASAN: use-after-free in __mutex_lock+0xf23/0x1360
> kernel/locking/mutex.c:1077
> Read of size 8 at addr ffff8881d63299c8 by task kworker/1:0/17
>
> CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.3.0-rc4+ #1 Hardware 
> name: Google Google Compute Engine/Google Compute Engine, BIOS Google 
> 01/01/2011
> Workqueue: usb_hub_wq hub_event
> Call Trace:
>   __dump_stack lib/dump_stack.c:77 [inline]
>   dump_stack+0xca/0x13e lib/dump_stack.c:113
>   print_address_description+0x6a/0x32c mm/kasan/report.c:351
>   __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482
>   kasan_report+0xe/0x12 mm/kasan/common.c:612
>   __mutex_lock_common kernel/locking/mutex.c:912 [inline]
>   __mutex_lock+0xf23/0x1360 kernel/locking/mutex.c:1077
>   usbtmc_disconnect+0x58/0x180 drivers/usb/class/usbtmc.c:2443
>   usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
>   __device_release_driver drivers/base/dd.c:1134 [inline]
>   device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165
>   bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556
>   device_del+0x420/0xb10 drivers/base/core.c:2339
>   usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237
>   usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2199
>   hub_port_connect drivers/usb/core/hub.c:4949 [inline]
>   hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
>   port_event drivers/usb/core/hub.c:5359 [inline]
>   hub_event+0x1454/0x3640 drivers/usb/core/hub.c:5441
>   process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
>   worker_thread+0x96/0xe20 kernel/workqueue.c:2415
>   kthread+0x318/0x420 kernel/kthread.c:255
>   ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
>
> Allocated by task 1737:
>   save_stack+0x1b/0x80 mm/kasan/common.c:69
>   set_track mm/kasan/common.c:77 [inline]
>   __kasan_kmalloc mm/kasan/common.c:487 [inline]
>   __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:460
>   kmalloc include/linux/slab.h:552 [inline]
>   kzalloc include/linux/slab.h:748 [inline]
>   usbtmc_probe+0xad/0x1360 drivers/usb/class/usbtmc.c:2328
>   usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
>   really_probe+0x281/0x6d0 drivers/base/dd.c:548
>   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
>   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
>   bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
>   __device_attach+0x217/0x360 drivers/base/dd.c:894
>   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
>   device_add+0xae6/0x16f0 drivers/base/core.c:2165
>   usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
>   generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
>   usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
>   really_probe+0x281/0x6d0 drivers/base/dd.c:548
>   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
>   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
>   bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
>   __device_attach+0x217/0x360 drivers/base/dd.c:894
>   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
>   device_add+0xae6/0x16f0 drivers/base/core.c:2165
>   usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536
>   hub_port_connect drivers/usb/core/hub.c:5098 [inline]
>   hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
>   port_event drivers/usb/core/hub.c:5359 [inline]
>   hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441
>   process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
>   worker_thread+0x96/0xe20 kernel/workqueue.c:2415
>   kthread+0x318/0x420 kernel/kthread.c:255
>   ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
>
> Freed by task 1737:
>   save_stack+0x1b/0x80 mm/kasan/common.c:69
>   set_track mm/kasan/common.c:77 [inline]
>   __kasan_slab_free+0x130/0x180 mm/kasan/common.c:449
>   slab_free_hook mm/slub.c:1423 [inline]
>   slab_free_freelist_hook mm/slub.c:1474 [inline]
>   slab_free mm/slub.c:3016 [inline]
>   kfree+0xe4/0x2f0 mm/slub.c:3957
>   kref_put include/linux/kref.h:65 [inline]
>   usbtmc_probe+0x55c/0x1360 drivers/usb/class/usbtmc.c:2433
>   usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
>   really_probe+0x281/0x6d0 drivers/base/dd.c:548
>   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
>   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
>   bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
>   __device_attach+0x217/0x360 drivers/base/dd.c:894
>   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
>   device_add+0xae6/0x16f0 drivers/base/core.c:2165
>   usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
>   generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
>   usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
>   really_probe+0x281/0x6d0 drivers/base/dd.c:548
>   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
>   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
>   bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
>   __device_attach+0x217/0x360 drivers/base/dd.c:894
>   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
>   device_add+0xae6/0x16f0 drivers/base/core.c:2165
>   usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536
>   hub_port_connect drivers/usb/core/hub.c:5098 [inline]
>   hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
>   port_event drivers/usb/core/hub.c:5359 [inline]
>   hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441
>   process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
>   worker_thread+0x96/0xe20 kernel/workqueue.c:2415
>   kthread+0x318/0x420 kernel/kthread.c:255
>   ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
>
> The buggy address belongs to the object at ffff8881d6329900
>   which belongs to the cache kmalloc-512 of size 512 The buggy address 
> is located 200 bytes inside of
>   512-byte region [ffff8881d6329900, ffff8881d6329b00) The buggy 
> address belongs to the page:
> page:ffffea000758ca00 refcount:1 mapcount:0 mapping:ffff8881da002500
> index:0x0 compound_mapcount: 0
> flags: 0x200000000010200(slab|head)
> raw: 0200000000010200 ffffea0007585680 0000000700000007 
> ffff8881da002500
> raw: 0000000000000000 00000000000c000c 00000001ffffffff 
> 0000000000000000 page dumped because: kasan: bad access detected
>
> Memory state around the buggy address:
>   ffff8881d6329880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>   ffff8881d6329900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> > ffff8881d6329980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>                                                ^
>   ffff8881d6329a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>   ffff8881d6329a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 
> ==================================================================
>
>
> Tested on:
>
> commit:         d0847550 usb-fuzzer: main usb gadget fuzzer driver
> git tree:       https://github.com/google/kasan.git
> console output: 
> https://syzkaller.appspot.com/x/log.txt?x=10ac29ee600000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=dbc9c80cc095da19
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> patch:          https://syzkaller.appspot.com/x/patch.diff?x=11f3b2e2600000
>

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2019-08-14 13:54 Re: divide error in usbtmc_generic_read Guido Kiener

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