Message-ID: <4FAADBD4.3050604@snafu.de>
Date:	Wed, 09 May 2012 23:04:20 +0200
From:	Oncaphillis <oncaphillis@...fu.de>
To:	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Memory corruption in SLUB from within USB Driver

Hallo,

  I'm developing a hardware application based on theEZ-USB SX2 Chip
from Cypress using libusb-1.0.8 and I see kernel crashes like:

<snip>
May 03 19:11:59 [kernel] Pid: 3998, comm: Engine25DeviceP Tainted: 
P            2.6.38.2+ #1 To be filled by O.E.M. To be fil
May 03 19:11:59 [kernel] RIP: 0010:[<ffffffff810b6e7c>]  
[<ffffffff810b6e7c>] kfree+0x84/0xda
May 03 19:11:59 [kernel] RSP: 0018:ffff88013bfc1dc8  EFLAGS: 00010246
May 03 19:11:59 [kernel] RAX: 4000000000000000 RBX: ffff8800ba814100 
RCX: 00007fffb5035158
May 03 19:11:59 [kernel] RDX: ffffea0000000000 RSI: ffffea00028cc460 
RDI: ffff8800ba814100
May 03 19:11:59 [kernel] RBP: ffff88013bfc1de8 R08: ffff88013c4c1f00 
R09: 0000000000000f9e
May 03 19:11:59 [kernel] R10: 0000000000000000 R11: 0000000000000206 
R12: ffff88013cea2c00
May 03 19:11:59 [kernel] R13: ffffffff8137ccde R14: ffff88013c30fd98 
R15: 000000004008550d
May 03 19:11:59 [kernel] FS:  00007f8fa39f9720(0000) 
GS:ffff88001fd00000(0000) knlGS:0000000000000000
May 03 19:11:59 [kernel] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
May 03 19:11:59 [kernel] CR2: 00007f8f93fff000 CR3: 000000013bfa5000 
CR4: 00000000000406e0
May 03 19:11:59 [kernel] DR0: 0000000000000000 DR1: 0000000000000000 
DR2: 0000000000000000
May 03 19:11:59 [kernel] DR3: 0000000000000000 DR6: 00000000ffff0ff0 
DR7: 0000000000000400
May 03 19:11:59 [kernel] Process Engine25DeviceP (pid: 3998, threadinfo 
ffff88013bfc0000, task ffff88014035e540)
May 03 19:11:59 [kernel]  0000000180000000 ffff88013cea2c00 
ffff88013cea2c00 00007fffb5035158
May 03 19:11:59 [kernel]  ffff88013bfc1e08 ffffffff8137ccde 
00007fffb5035158 0000000000000000
May 03 19:11:59 [kernel]  ffff88013bfc1e98 ffffffff8137f494 
ffff880138886800 ffff8801388868e8
May 03 19:11:59 [kernel]  [<ffffffff8137ccde>] free_async+0x22/0x47
May 03 19:11:59 [kernel]  [<ffffffff8137f494>] usbdev_do_ioctl+0xa51/0xd3f
May 03 19:11:59 [kernel]  [<ffffffff81050d8c>] ? 
__hrtimer_start_range_ns+0x2f3/0x305
May 03 19:11:59 [kernel]  [<ffffffff8137f79a>] usbdev_ioctl+0x9/0xd
May 03 19:11:59 [kernel]  [<ffffffff810c76a3>] do_vfs_ioctl+0x3e9/0x438
May 03 19:11:59 [kernel]  [<ffffffff810c811e>] ? 
poll_select_set_timeout+0x61/0x7c
May 03 19:11:59 [kernel]  [<ffffffff810c7734>] sys_ioctl+0x42/0x65
May 03 19:11:59 [kernel]  [<ffffffff81001f3b>] 
system_call_fastpath+0x16/0x1b
May 03 19:11:59 [kernel] RIP  [<ffffffff810b6e7c>] kfree+0x84/0xda
May 03 19:11:59 [kernel]  RSP <ffff88013bfc1dc8>
May 03 19:11:59 [kernel] ---[ end trace bcf8fadb3664e4f9 ]---
</snip>


Here it crashes in the context of the usbdev but sometimes it happens 
from within the
network driver. So in essence the memory management if SLUB seems to be 
corrupted.
I've activated Memory poisoning via /sys/kernel/slab/kmalloc-512/poison and
found the following.

<snip>

May 09 18:46:34 [kernel] [  133.013088] 
=============================================================================
May 09 18:46:34 [kernel] [  133.013091] BUG kmalloc-512 (Not tainted): 
Poison overwritten
May 09 18:46:34 [kernel] [  133.013093] 
-----------------------------------------------------------------------------
May 09 18:46:34 [kernel] [  133.013093]
May 09 18:46:34 [kernel] [  133.013096] INFO: 
0xffff880079b253b0-0xffff880079b253b1. First byte 0x9d instead of 0x6b
May 09 18:46:34 [kernel] [  133.013102] INFO: Allocated in 
proc_do_submiturb+0x41a/0x876 age=188 cpu=0 pid=4468
May 09 18:46:34 [kernel] [  133.013105] _T.987+0x1fc/0x239
May 09 18:46:34 [kernel] [  133.013106] ___kmalloc+0xc8/0x15b
May 09 18:46:34 [kernel] [  133.013108] _proc_do_submiturb+0x41a/0x876
May 09 18:46:34 [kernel] [  133.013110] _usbdev_do_ioctl+0x83b/0xd30
May 09 18:46:34 [kernel] [  133.013112] _usbdev_ioctl+0x9/0xd
May 09 18:46:34 [kernel] [  133.013114] _do_vfs_ioctl+0x3cc/0x412
May 09 18:46:34 [kernel] [  133.013116] _sys_ioctl+0x42/0x65
May 09 18:46:34 [kernel] [  133.013119] _system_call_fastpath+0x16/0x1b
May 09 18:46:34 [kernel] [  133.013122] INFO: Freed in 
free_async+0x3a/0x69 age=63 cpu=0 pid=4468
May 09 18:46:34 [kernel] [  133.013123] ___slab_free+0x2d/0x2a5
May 09 18:46:34 [kernel] [  133.013125] _kfree+0xe4/0xed
May 09 18:46:34 [kernel] [  133.013126] _free_async+0x3a/0x69
May 09 18:46:34 [kernel] [  133.013128] _usbdev_do_ioctl+0xa48/0xd30
May 09 18:46:34 [kernel] [  133.013130] _usbdev_ioctl+0x9/0xd
May 09 18:46:34 [kernel] [  133.013132] _do_vfs_ioctl+0x3cc/0x412
May 09 18:46:34 [kernel] [  133.013133] _sys_ioctl+0x42/0x65
May 09 18:46:34 [kernel] [  133.013135] _system_call_fastpath+0x16/0x1b
May 09 18:46:34 [kernel] [  133.013137] INFO: Slab 0xffffea0001e6c900 
objects=19 used=19 fp=0x          (null) flags=0x4000000000004080
May 09 18:46:34 [kernel] [  133.013139] INFO: Object 0xffff880079b253b0 
@offset=5040 fp=0xffff880079b24000
May 09 18:46:34 [kernel] [  133.013140]

May 09 18:46:34 [kernel] [  133.013142] Bytes b4 ffff880079b253a0: f3 5b 
ff ff 00 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a  .[......ZZZZZZZZ
May 09 18:46:34 [kernel] [  133.013144] Object ffff880079b253b0: 9d 8d 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  ..kkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013146] Object ffff880079b253c0: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013148] Object ffff880079b253d0: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013149] Object ffff880079b253e0: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013153] Object ffff880079b25400: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013155] Object ffff880079b25410: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013157] Object ffff880079b25420: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013158] Object ffff880079b25430: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013160] Object ffff880079b25440: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013162] Object ffff880079b25450: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013164] Object ffff880079b25460: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013166] Object ffff880079b25470: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013167] Object ffff880079b25480: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013169] Object ffff880079b25490: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013171] Object ffff880079b254a0: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013173] Object ffff880079b254b0: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013175] Object ffff880079b254c0: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013176] Object ffff880079b254d0: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013178] Object ffff880079b254e0: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013180] Object ffff880079b254f0: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013182] Object ffff880079b25500: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013184] Object ffff880079b25510: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013193] Object ffff880079b25560: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013195] Object ffff880079b25570: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013196] Object ffff880079b25580: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013198] Object ffff880079b25590: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
May 09 18:46:34 [kernel] [  133.013200] Object ffff880079b255a0: 6b 6b 
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5  kkkkkkkkkkkkkkk.
May 09 18:46:34 [kernel] [  133.013202] Redzone ffff880079b255b0: bb bb 
bb bb bb bb bb bb                          ........
May 09 18:46:34 [kernel] [  133.013204] Padding ffff880079b256f0: 5a 5a 
5a 5a 5a 5a 5a 5a                          ZZZZZZZZ
May 09 18:46:34 [kernel] [  133.013206] Pid: 0, comm: swapper/2 Not 
tainted 3.3.4 #2
May 09 18:46:34 [kernel] [  133.013207] Call Trace:
May 09 18:46:34 [kernel] [  133.013209] <IRQ>  [<ffffffff810ca00b>] 
print_trailer+0x129/0x132
May 09 18:46:34 [kernel] [  133.013215]  [<ffffffff810ca53f>] 
check_bytes_and_report+0xb2/0xeb
May 09 18:46:34 [kernel] [  133.013218]  [<ffffffff81437fbb>] ? 
___pskb_trim+0x43/0x248
May 09 18:46:34 [kernel] [  133.013220]  [<ffffffff810ca62d>] 
check_object+0xb5/0x1e2
May 09 18:46:34 [kernel] [  133.013222]  [<ffffffff81437f5c>] ? 
__netdev_alloc_skb+0x1d/0x39
May 09 18:46:34 [kernel] [  133.013224]  [<ffffffff810cbf0e>] 
alloc_debug_processing+0xa4/0x138
May 09 18:46:34 [kernel] [  133.013226]  [<ffffffff810cc94f>] 
T.987+0x1fc/0x239
May 09 18:46:34 [kernel] [  133.013228]  [<ffffffff81437f5c>] ? 
__netdev_alloc_skb+0x1d/0x39
May 09 18:46:34 [kernel] [  133.013231]  [<ffffffff8143dfb6>] ? 
netif_receive_skb+0x71/0x78
May 09 18:46:34 [kernel] [  133.013233]  [<ffffffff810ce104>] 
__kmalloc_track_caller+0xc9/0x155
May 09 18:46:34 [kernel] [  133.013235]  [<ffffffff81437f5c>] ? 
__netdev_alloc_skb+0x1d/0x39
May 09 18:46:34 [kernel] [  133.013237]  [<ffffffff81436f54>] 
__alloc_skb+0x69/0x12e
May 09 18:46:34 [kernel] [  133.013239]  [<ffffffff81437f5c>] 
__netdev_alloc_skb+0x1d/0x39
May 09 18:46:34 [kernel] [  133.013243]  [<ffffffff81379a25>] 
e1000_clean_rx_irq+0x1b8/0x2c1
May 09 18:46:34 [kernel] [  133.013246]  [<ffffffff8104b1a4>] ? 
check_preempt_curr+0x3e/0x6c
May 09 18:46:34 [kernel] [  133.013248]  [<ffffffff8137be80>] 
e1000_clean+0x75/0x23e
May 09 18:46:34 [kernel] [  133.013251]  [<ffffffff81051d63>] ? 
T.1553+0x3a/0x3f
May 09 18:46:34 [kernel] [  133.013253]  [<ffffffff8143e726>] 
net_rx_action+0x6a/0x1cb
May 09 18:46:34 [kernel] [  133.013256]  [<ffffffff81030459>] 
__do_softirq+0xc2/0x182
May 09 18:46:34 [kernel] [  133.013258]  [<ffffffff81520e0c>] 
call_softirq+0x1c/0x30
May 09 18:46:34 [kernel] [  133.013261]  [<ffffffff81003207>] 
do_softirq+0x33/0x68
May 09 18:46:34 [kernel] [  133.013263]  [<ffffffff810301d3>] 
irq_exit+0x44/0x9c
May 09 18:46:34 [kernel] [  133.013265]  [<ffffffff81002a76>] 
do_IRQ+0x98/0xaf
May 09 18:46:34 [kernel] [  133.013268]  [<ffffffff815198ab>] 
common_interrupt+0x6b/0x6b
May 09 18:46:34 [kernel] [  133.013269] <EOI>  [<ffffffff810080af>] ? 
mwait_idle+0xad/0xeb
May 09 18:46:34 [kernel] [  133.013273]  [<ffffffff81001553>] 
cpu_idle+0x68/0xa4
May 09 18:46:34 [kernel] [  133.013275]  [<ffffffff81513d8a>] 
start_secondary+0x1bd/0x1c1
May 09 18:46:34 [kernel] [  133.013278] FIX kmalloc-512: Restoring 
0xffff880079b253b0-0xffff880079b253b1=0x6b
May 09 18:46:34 [kernel] [  133.013279]
May 09 18:46:34 [kernel] [  133.013280] FIX kmalloc-512: Marking all 
objects used
</snip>

So the USB Driver seems to exceed the memory it has allocated:

This is for the kernel 3.3.4 but I saw it in 2.6.x kernels as well

Here's a lspci as well

<snip>

00:00.0 Host bridge: Intel Corporation 82Q35 Express DRAM Controller 
(rev 02)
00:02.0 VGA compatible controller: Intel Corporation 82Q35 Express 
Integrated Graphics Controller (rev 02)
00:03.0 Communication controller: Intel Corporation 82Q35 Express MEI 
Controller (rev 02)
00:03.2 IDE interface: Intel Corporation 82Q35 Express PT IDER 
Controller (rev 02)
00:03.3 Serial controller: Intel Corporation 82Q35 Express Serial KT 
Controller (rev 02)
00:19.0 Ethernet controller: Intel Corporation 82566DM-2 Gigabit Network 
Connection (rev 02)
00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #4 (rev 02)
00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #5 (rev 02)
00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI 
Controller #2 (rev 02)
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express 
Port 1 (rev 02)
00:1c.4 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express 
Port 5 (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #3 (rev 02)
00:1d.3 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #6 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI 
Controller #1 (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 92)
00:1f.0 ISA bridge: Intel Corporation 82801IO (ICH9DO) LPC Interface 
Controller (rev 02)
00:1f.2 IDE interface: Intel Corporation 82801IR/IO/IH (ICH9R/DO/DH) 4 
port SATA IDE Controller (rev 02)
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller 
(rev 02)
00:1f.5 IDE interface: Intel Corporation 82801I (ICH9 Family) 2 port 
SATA IDE Controller (rev 02)
00:1f.6 Signal processing controller: Intel Corporation 82801I (ICH9 
Family) Thermal Subsystem (rev 02)
01:00.0 PCI bridge: PLX Technology, Inc. PEX8112 x1 Lane PCI 
Express-to-PCI Bridge (rev aa)
03:00.0 Ethernet controller: Intel Corporation 82573V Gigabit Ethernet 
Controller (Copper) (rev 03)

</snip>

Thanks

O.




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