Re: general protection fault in do_msgrcv [3.8]
From: Stanislav Kinsbursky
Date: Wed Feb 20 2013 - 03:24:09 EST
19.02.2013 22:04, Dave Jones ÐÐÑÐÑ:
general protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
Modules linked in: can af_rxrpc binfmt_misc scsi_transport_iscsi ax25 ipt_ULOG decnet nfc appletalk x25 rds ipx p8023 psnap p8022 llc irda crc_ccitt atm lockd sunrpc ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_conntrack nf_conntrack ip6table_filter ip6_tables btusb bluetooth snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_pcm edac_core snd_page_alloc snd_timer microcode rfkill usb_debug serio_raw pcspkr snd soundcore vhost_net r8169 mii tun macvtap macvlan kvm_amd kvm
CPU 2
Pid: 887, comm: trinity-child2 Not tainted 3.8.0+ #57 Gigabyte Technology Co., Ltd. GA-MA78GM-S2H/GA-MA78GM-S2H
RIP: 0010:[<ffffffff812aebba>] [<ffffffff812aebba>] do_msgrcv+0x22a/0x670
RSP: 0018:ffff88011892be88 EFLAGS: 00010297
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000004000
RDX: 000000007adea6f6 RSI: 6b6b6b6b6b6b6b6b RDI: ffff8801189ffb60
RBP: ffff88011892bf68 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8801189ffc10 R14: ffff8801189ffb60 R15: 6b6b6b6b6b6b6b6b
FS: 00007f681e955740(0000) GS:ffff88012f200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f681e846064 CR3: 000000012553d000 CR4: 00000000000007e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process trinity-child2 (pid: 887, threadinfo ffff88011892a000, task ffff88010bc82490)
Stack:
ffff88011892beb8 ffff88010bc82490 ffff88010bc82490 ffff88010bc82490
ffff8801186d8000 ffffffff812ad5f0 0000000001aba000 ffffffff81c688c0
000000007adea6f6 00000000001fffff 0000400046a9467e 6b6b6b6b6b6b6b6b
Call Trace:
[<ffffffff812ad5f0>] ? load_msg+0x180/0x180
[<ffffffff810b8395>] ? trace_hardirqs_on_caller+0x115/0x1a0
[<ffffffff813347be>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[<ffffffff812af015>] sys_msgrcv+0x15/0x20
[<ffffffff816a8482>] system_call_fastpath+0x16/0x1b
Code: 84 14 01 00 00 8b 8d 74 ff ff ff 85 c9 0f 84 52 02 00 00 48 8b 95 60 ff ff ff 48 39 55 80 0f 84 4d 02 00 00 4c 89 bd 78 ff ff ff <4d> 8b 3f 48 ff 45 80 4d 39 ef 75 9a 66 90 48 81 bd 78 ff ff ff
RIP [<ffffffff812aebba>] do_msgrcv+0x22a/0x670
RSP <ffff88011892be88>
---[ end trace d3cc044a84b1d828 ]---
oopsing instruction is..
0: 4d 8b 3f mov (%r15),%r15
Looks like a use-after-free.
Disassembly of ipc/msg.o shows this happens here..
msg = ERR_PTR(-EAGAIN);
tmp = msq->q_messages.next;
1537: 4d 8b be b0 00 00 00 mov 0xb0(%r14),%r15
while (tmp != &msq->q_messages) {
153e: 4d 8d ae b0 00 00 00 lea 0xb0(%r14),%r13
1545: 4d 39 ef cmp %r13,%r15
1548: 0f 84 5f 03 00 00 je 18ad <do_msgrcv+0x50d>
154e: 48 c7 45 80 00 00 00 movq $0x0,-0x80(%rbp)
1555: 00
1556: 48 c7 85 78 ff ff ff movq $0xfffffffffffffff5,-0x88(%rbp)
155d: f5 ff ff ff
1561: eb 0d jmp 1570 <do_msgrcv+0x1d0>
1563: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
}
} else
break;
msg_counter++;
}
tmp = tmp->next;
1568: 4d 8b 3f mov (%r15),%r15
if (ipcperms(ns, &msq->q_perm, S_IRUGO))
goto out_unlock;
msg = ERR_PTR(-EAGAIN);
tmp = msq->q_messages.next;
while (tmp != &msq->q_messages) {
Looks like Stanislav recently changed this code, so problem was likely introduced
in those changes.
Hello.
Is it easy to reproduce? Do you use KVM?
There is a NULL selinux handler bug fix by Stephen Smalley here:
https://lkml.org/lkml/2013/2/6/663
But anyway, this bug fix affects only the case, when MSG_COPY flag is set.
And this is not your case, I suppose?
Dave
--
Best regards,
Stanislav Kinsbursky
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