From: Ben Greear <greearb@candelatech.com>
To: linux-nfs@vger.kernel.org
Subject: Re: Use-after-free in hacked 2.6.38.8 kernel.
Date: Fri, 24 Jun 2011 08:29:04 -0700 [thread overview]
Message-ID: <4E04AD40.2070404@candelatech.com> (raw)
In-Reply-To: <4E03BE46.2040405@candelatech.com>
On 06/23/2011 03:29 PM, Ben Greear wrote:
> 2.6.38.8 kernel, with our NFS bind-source-IP patches and some other
> stuff, including a tainting module (though that module isn't
> active in this test).
And, another one. Different place this time though:
[root@simech2 ~]# general protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
last sysfs file: /sys/devices/virtual/bdi/0:51/uevent
CPU 0
Modules linked in:
=============================================================================
BUG kmalloc-64: Poison overwritten
-----------------------------------------------------------------------------
INFO: 0xffff880097422de4-0xffff880097422de5. First byte 0x1 instead of 0x6b
INFO: Allocated in rpcb_getport_async+0x39c/0x5a5 [sunrpc] age=22 cpu=1 pid=23678
INFO: Freed in rpcb_map_release+0x3f/0x44 [sunrpc] age=20 cpu=0 pid=18587
INFO: Slab 0xffffea0002116770 objects=30 used=7 fp=0xffff880097422dd0 flags=0x200000000000c1
INFO: Object 0xffff880097422dd0 @offset=3536 fp=0xffff8800974224c8
Bytes b4 0xffff880097422dc0: ae db 4e 00 01 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a ®ÛN.....ZZZZZZZZ
Object 0xffff880097422dd0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Object 0xffff880097422de0: 6b 6b 6b 6b 01 08 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkk..kkkkkkkkkk
Object 0xffff880097422df0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Object 0xffff880097422e00: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkkkkkkkkkk¥
Redzone 0xffff880097422e10: bb bb bb bb bb bb bb bb »»»»»»»»
Padding 0xffff880097422e50: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ
Pid: 2259, comm: gnuserver Tainted: P 2.6.38.8+ #9
Call Trace:
[<ffffffff81100aee>] ? print_trailer+0x12e/0x137
[<ffffffff81100fb7>] ? check_bytes_and_report+0xb9/0xfd
[<ffffffff81129cbb>] ? alloc_fdtable+0xb2/0xda
[<ffffffff811010b0>] ? check_object+0xb5/0x192
[<ffffffff81129c6b>] ? alloc_fdtable+0x62/0xda
[<ffffffff811014d1>] ? alloc_debug_processing+0x79/0xf2
[<ffffffff81102bff>] ? __slab_alloc+0x337/0x375
[<ffffffff81129c6b>] ? alloc_fdtable+0x62/0xda
[<ffffffff81129d92>] ? dup_fd+0xaf/0x35b
[<ffffffff81129c6b>] ? alloc_fdtable+0x62/0xda
[<ffffffff81103d87>] ? kmem_cache_alloc_trace+0x76/0xef
[<ffffffff81129c6b>] ? alloc_fdtable+0x62/0xda
[<ffffffff81129e61>] ? dup_fd+0x17e/0x35b
[<ffffffff8104957b>] ? copy_process+0x714/0x12a5
[<ffffffff8105a25f>] ? sigprocmask+0x2f/0xc6
[<ffffffff8104a217>] ? do_fork+0x10b/0x2ed
[<ffffffff810e143d>] ? might_fault+0x63/0xb3
[<ffffffff8111c993>] ? path_put+0x1d/0x22
[<ffffffff81011fed>] ? sys_clone+0x23/0x25
[<ffffffff8100ae33>] ? stub_clone+0x13/0x20
[<ffffffff8100aa92>] ? system_call_fastpath+0x16/0x1b
FIX kmalloc-64: Restoring 0xffff880097422de4-0xffff880097422de5=0x6b
IX kmalloc-64: Marking all objects used
xt_TPROXY nf_tproxy_core xt_socket nf_defrag_ipv6 xt_connlimit 8021q garp macvlan pktgen iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi fuse
ip6table_filter ip6_tables ebtable_nat ebtables stp llc nfs lockd fscache nfs_acl auth_rpcgss sunrpc ipv6 kvm_intel kvm uinput i5k_amb i5000_edac iTCO_wdt
ioatdma i2c_i801 shpchp iTCO_vendor_support edac_core pcspkr serio_raw e1000e microcode dca floppy radeon ttm drm_kms_helper drm hwmon i2c_algo_bit i2c_core
[last unloaded: ipt_addrtype]
Pid: 18587, comm: kworker/0:1 Tainted: P 2.6.38.8+ #9 Supermicro X7DBU/X7DBU
RIP: 0010:[<ffffffffa0294f5b>] [<ffffffffa0294f5b>] rpcb_getport_done+0x47/0xab [sunrpc]
RSP: 0018:ffff8800c7133d20 EFLAGS: 00010246
RAX: ffffffffa0294f14 RBX: 0000000000000000 RCX: 0000000000000088
RDX: ffff880097422dd0 RSI: 000000006b6b0801 RDI: ffff880124668c80
RBP: ffff8800c7133d40 R08: ffff880097422dd0 R09: 0000000000000000
R10: ffff8800c7133d20 R11: ffff8800c7133c40 R12: ffff880097422dd0
R13: 6b6b6b6b6b6b6b6b R14: ffff880124668c80 R15: ffffffffa028db26
FS: 0000000000000000(0000) GS:ffff8800cfc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000002666940 CR3: 00000000a73b6000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process kworker/0:1 (pid: 18587, threadinfo ffff8800c7132000, task ffff8800c4fea0a0)
Stack:
ffff880124668c80 ffff880124668cf0 0000000000000001 0000000000000000
ffff8800c7133d60 ffffffffa028d520 0000000000000000 ffff880124668c80
ffff8800c7133db0 ffffffffa028d911 ffff8800ca597080 0000000000000000
Call Trace:
[<ffffffffa028d520>] rpc_exit_task+0x27/0x55 [sunrpc]
[<ffffffffa028d911>] __rpc_execute+0x78/0x24b [sunrpc]
[<ffffffffa028db26>] ? rpc_async_schedule+0x0/0x12 [sunrpc]
[<ffffffffa028db36>] rpc_async_schedule+0x10/0x12 [sunrpc]
[<ffffffff81061613>] process_one_work+0x259/0x41b
[<ffffffff8106153b>] ? process_one_work+0x181/0x41b
[<ffffffff81063a51>] worker_thread+0x133/0x217
[<ffffffff8106391e>] ? worker_thread+0x0/0x217
[<ffffffff81066fc0>] kthread+0x7d/0x85
[<ffffffff8100b924>] kernel_thread_helper+0x4/0x10
[<ffffffff81463098>] ? restore_args+0x0/0x30
[<ffffffff81066f43>] ? kthread+0x0/0x85
[<ffffffff8100b920>] ? kernel_thread_helper+0x0/0x10
Code: fb 74 05 83 fb a3 75 0e 41 ff 85 f4 05 00 00 bb a3 ff ff ff eb 04 85 db 79 0e 49 8b 45 08 31 f6 4c 89 ef ff 50 20 eb 32 8b 76 14 <49> 8b 45 08 66 85 f6 75
0f 31 f6 4c 89 ef bb f3 ff ff ff ff 50
RIP [<ffffffffa0294f5b>] rpcb_getport_done+0x47/0xab [sunrpc]
RSP <ffff8800c7133d20>
---[ end trace 56d19572836bccfa ]---
--
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc http://www.candelatech.com
prev parent reply other threads:[~2011-06-24 15:29 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-23 22:29 Use-after-free in hacked 2.6.38.8 kernel Ben Greear
2011-06-24 15:29 ` Ben Greear [this message]
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