On 07/03, Michael S. Tsirkin wrote:

On Sun, Jul 03, 2016 at 05:18:29PM +0200, Oleg Nesterov wrote:

quoted

Well, we are going to kill all tasks which share this memory. I mean, ->mm.
If "sharing memory with another task" means, say, a file, then this memory
won't be unmapped (if shared).

So let me ask again... Suppose, say, QEMU does VHOST_SET_OWNER and then we
unmap its (anonymous/non-shared) memory. Who else's memory can be corrupted?

As you say, I mean anyone who shares memory with QEMU through a file.

And in this case vhost_worker() reads the anonymous memory of QEMU process,
not the memory which can be shared with another task, correct?

And if QEMU simply crashes, this can't affect anyone who shares memory with
QEMU through a file, yes?

Oleg.

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