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Re: [Xen-devel] [XSM:ACM] When cw is used, dom0 reboots.

To: Syunsuke HAYASHI <syunsuke@xxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [XSM:ACM] When cw is used, dom0 reboots.
From: "George S. Coker, II" <gscoker@xxxxxxxxxxxxxx>
Date: Thu, 27 Sep 2007 12:44:49 -0400
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
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This is a null dereference bug in ACM.  I've just posted a patch to
Xen-devel.  

George

On Tue, 2007-09-25 at 12:02 +0900, Syunsuke HAYASHI wrote:
> Hi ,
> 
> When cw is used, dom0 reboots.
> Though I set quest memory size.
> 
> I want to study into the cause.
> Please teach how to examine it.
> 
> 
> 
> 
> #xm create vm1.conf <--  OK
> #xm create vm4.conf <--  NO
> ................... <--  system boot
> 
> #last
> root     pts/1          myPC     Tue Sep 25 11:25 - crash (09:01)
> reboot   system boot  2.6.18-xen Tue Sep 25 20:06         (-8:-16)
>          ~~~~~~~~~~~
> 
> 
> ---------------about my setting--------------------
> Xen-api is effective.
> 
> 
> #cat vm1.conf
> kernel = "/boot/vmlinuz-2.6.18-xen"
> ramdisk = "/boot/initrd-2.6.18-xenU.img"
> memory = "128"
>           ~~~~
> name = "vm1"
> disk = [ 'file:/xen/vm1.img,sda1,w' ]
> vif = [ '' ]
> root = "/dev/sda1 ro"
> on_xend_stop = "suspend"
> extra = "3 xencons=tty"
> access_control = ['policy=example.client_v1,label=dom_HomeBanking']
> 
> #cat vm4.conf
> kernel = "/boot/vmlinuz-2.6.18-xen"
> ramdisk = "/boot/initrd-2.6.18-xenU.img"
> memory = "128"
>          ~~~~~
> name = "vm4"
> disk = [ 'file:/xen/vm4.img,sda1,w']
> vif = [ '' ]
> root = "/dev/sda1 ro"
> on_xend_stop = "suspend"
> extra = "3"
> access_control = ['policy=example.client_v1,label=dom_Fun']
> 
> 
> #xm dumppolicy
> Policy dump:
> ============
> POLICY REFERENCE = example.client_v1.
> PolicyVer = 0.
> XML Vers. = 1.0
> Magic     = 1debc.
> Len       = 198.
> Primary   = CHINESE WALL (c=1, off=40).
> Secondary = SIMPLE TYPE ENFORCEMENT (c=2, off=b8).
> 
> 
> Chinese Wall policy:
> ====================
> Policy version= 0.
> Max Types     = 4.
> Max Ssidrefs  = 7.
> Max ConfSets  = 1.
> Ssidrefs Off  = 24.
> Conflicts Off = 5c.
> Runing T. Off = 64.
> C. Agg. Off   = 6c.
> 
> SSID To CHWALL-Type matrix:
> 
>    ssidref 0:  00 00 00 00
>    ssidref 1:  00 00 00 01  <-- Domain-0
>    ssidref 2:  00 01 00 00
>    ssidref 3:  01 00 00 00
>    ssidref 4:  00 00 01 00
>    ssidref 5:  00 00 00 01
>    ssidref 6:  00 00 00 01
> 
> Confict Sets:
> 
>    c-set 0:    01 00 01 00
> 
> Running
> Types:         00 00 00 01
> 
> Conflict
> Aggregate Set: 00 00 00 00
> 
> 
> Simple Type Enforcement policy:
> ===============================
> Policy version= 0.
> Max Types     = 6.
> Max Ssidrefs  = 11.
> Ssidrefs Off  = 14.
> 
> SSID To STE-Type matrix:
> 
>    ssidref 0: 00 00 00 00 00 00
>    ssidref 1: 01 01 01 01 01 01  <-- Domain-0
>    ssidref 2: 01 00 00 00 00 00
>    ssidref 3: 00 01 00 00 00 00
>    ssidref 4: 00 00 00 00 01 00
>    ssidref 5: 01 01 01 00 01 00
>    ssidref 6: 00 01 00 01 01 00
>    ssidref 7: 00 00 01 00 00 00
>    ssidref 8: 00 00 00 00 00 01
>    ssidref 9: 00 00 00 01 00 00
>    ssidref a: 00 00 00 00 01 00
>    ssidref b: 00 01 00 00 00 00
>    ssidref c: 00 00 00 00 01 00
>    ssidref d: 00 00 00 00 01 00
>    ssidref e: 00 01 00 00 00 00
>    ssidref f: 00 00 00 00 00 01
>    ssidref10: 00 00 00 00 01 00
> 
> Thanks,
> 
> Syunsuke Hayashi.
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
-- 
George S. Coker, II <gscoker@xxxxxxxxxxxxxx> 443-479-6944

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