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Re: [Xen-devel] [BUG] Invalid guest state in Xen master, dom0 linux-5.3.6, domU windows 10
- To: Håkon Alstadheim <hakon@xxxxxxxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 4 Nov 2019 23:42:11 +0000
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- Delivery-date: Mon, 04 Nov 2019 23:42:25 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 04/11/2019 23:20, Håkon Alstadheim wrote:
>
> (XEN) RFLAGS=0x00000193 (0x00000193) DR7 = 0x0000000000000400
> <snip>
> (XEN) *** Insn bytes from ffffb8868f61d69a: 44 00 00 8c d0 9c 81 0c 24
> 00 01 00 00 9d 8e d0 <fffffff1> 9c 81 24 24 ff fe ff ff 9d c3 cc cc cc
> cc cc
Ok. One question answered, several more WTF.
0000000000000000 <.data>:
0: 44 00 00 add %r8b,(%rax)
3: 8c d0 mov %ss,%eax
5: 9c pushfq
6: 81 0c 24 00 01 00 00 orl $0x100,(%rsp)
d: 9d popfq
e: 8e d0 mov %eax,%ss
10: f1 icebp
11: 9c pushfq
12: 81 24 24 ff fe ff ff andl $0xfffffeff,(%rsp)
19: 9d popfq
1a: c3 retq
1b: cc int3
1c: cc int3
1d: cc int3
1e: cc int3
1f: cc int3
This is a serious exercising of architectural corner cases, by layering
a single step exception on top of a MovSS-deferred ICEBP.
Now I've looked closer, this isn't a CVE-2018-8897 exploit as no
breakpoints are configured in %dr7, so I'm going to revise my guess some
new debugger-detection in DRM software.
~Andrew
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- References:
- Re: [Xen-devel] [BUG] Invalid guest state in Xen master, dom0 linux-5.3.6, domU windows 10
- Re: [Xen-devel] [BUG] Invalid guest state in Xen master, dom0 linux-5.3.6, domU windows 10
- Re: [Xen-devel] [BUG] Invalid guest state in Xen master, dom0 linux-5.3.6, domU windows 10
- Re: [Xen-devel] [BUG] Invalid guest state in Xen master, dom0 linux-5.3.6, domU windows 10
- Re: [Xen-devel] [BUG] Invalid guest state in Xen master, dom0 linux-5.3.6, domU windows 10
- Re: [Xen-devel] [BUG] Invalid guest state in Xen master, dom0 linux-5.3.6, domU windows 10
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