Question about uprobes

[Mulyadi Santosa]

On Thursday, April 6, 2017, W. Michael Petullo <mike at flyn.org> wrote:

> I am writing some software that monitors a guest VM using virtual-machine
> introspection and "hijacks" system calls under certain conditions. For
> example, the program might inject an int3/breakpoint into the guest
> kernel at the entry point to sys_open. When the breakpoint is hit, the
> program might set the guest instruction pointer to the address to which
> sys_open would have itself returned and set register RAX to some desired
> error-code return value.
>
> The problem I am encountering is that for some reason the process is
> triggering a "uprobe ... failed to handle uretprobe" message from the
> guest kernel.  I do not yet know enough about uprobes to understand what
> might be causing this. Is there something in procedures such as sys_open
> which must execute to prevent the error which causes the kernel to print
> this message?
>
>
> What vm  hypervisor do you use?

Regards,

Mulyadi


-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
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