Subject: Fw: [Bug 200033] New: stack-out-of-bounds in __xfrm_dst_hash net/xfrm/xfrm_hash.h

From: Stephen Hemminger <[email-masked]>
Date: Tue, 12 Jun 2018 10:38:40 -0700

Begin forwarded message:

Date: Tue, 12 Jun 2018 01:44:36 +0000
From: [email-masked]
To: [email-masked]
Subject: [Bug 200033] New: stack-out-of-bounds in __xfrm_dst_hash net/xfrm/xfrm_hash.h

https://bugzilla.kernel.org/show_bug.cgi?id=200033

            Bug ID: 200033
           Summary: stack-out-of-bounds in __xfrm_dst_hash
                    net/xfrm/xfrm_hash.h
           Product: Networking
           Version: 2.5
    Kernel Version: v4.17
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
          Assignee: [email-masked]
          Reporter: [email-masked]
        Regression: No

Created attachment 276483
  --> https://bugzilla.kernel.org/attachment.cgi?id=276483&action=edit  
Found this bug with modified syzkaller

==================================================================
BUG: KASAN: stack-out-of-bounds in __xfrm_dst_hash net/xfrm/xfrm_hash.h:96
[inline]
BUG: KASAN: stack-out-of-bounds in xfrm_dst_hash net/xfrm/xfrm_state.c:61
[inline]
BUG: KASAN: stack-out-of-bounds in xfrm_state_find+0x24ab/0x26e0
net/xfrm/xfrm_state.c:953
Read of size 4 at addr ffff880054b17b70 by task syz-executor0/13697

CPU: 0 PID: 13697 Comm: syz-executor0 Not tainted 4.17.0 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1
04/01/2014
Call Trace:

The buggy address belongs to the page:
page:ffffea000152c5c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x100000000000000()
raw: 0100000000000000 0000000000000000 ffffea000152c5c8 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff880054b17a00: 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 f2
 ffff880054b17a80: f2 f2 f2 00 00 00 00 f2 f2 f2 f2 00 00 00 00 00
>ffff880054b17b00: f2 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00 f2 f2  
                                                             ^
 ffff880054b17b80: f2 f2 f2 00 00 00 00 00 00 00 00 00 f2 f2 f2 f3
 ffff880054b17c00: f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 13697 Comm: syz-executor0 Tainted: G    B             4.17.0 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1
04/01/2014
Call Trace:
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

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