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[Xen-devel] [PATCH][HVM] Inject #GP for un-emulated instructions rather
| To: | "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>, "xen-devel" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH][HVM] Inject #GP for un-emulated instructions rather than crash guest |
| From: | "Cui, Dexuan" <dexuan.cui@xxxxxxxxx> |
| Date: | Tue, 27 Nov 2007 12:37:23 +0800 |
| Delivery-date: | Mon, 26 Nov 2007 20:39:49 -0800 |
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| Thread-index: | AcgwqGajcxL9lyZSSkG/2aFRcODxtwABFqOQ |
| Thread-topic: | [PATCH][HVM] Inject #GP for un-emulated instructions rather than crash guest |
The CrashMe stress test (a process repeatedly forks child processes, and
the child processes initialize a buffer with random numbers, then treat
the buffer as code, and execute it) can crash 32-bit HVM RHEL5.1 guest
easily; this is because we haven't emulated all the instructions in
handle_mmio() yet.
The CrashMe process runs with root rights, and can access MMIO space in
an unknown way ("strace -f" shows the random codes running at CPL=3
don't call mmap(), and don't open any special files in /dev/ "); the gpa
may look like 0xa**** or 0xb****, or 0xfee0****.
After running CrashMe for several hours, I have found 24 un-emulated
instructions may be hit...
This patch may serve as a workaround.
Signed-off-by: Dexuan Cui <dexuan.cui@xxxxxxxxx>
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