Ingo Molnar <mi...@kernel.org> writes:
> * Alexander Shishkin <alexander.shish...@linux.intel.com> wrote:
>
>> + for (at = base; at < top; at++) {
>> + /*
>> + * Note that right now *this* BTS code only works if
>> + * attr::exclude_kernel is set, but let's keep this extra
>> + * check here in case that changes.
>> + */
>> + if (event->attr.exclude_kernel &&
>> + (at->from >= PAGE_OFFSET || at->to >= PAGE_OFFSET))
>> + skip++;
>
> Yeah, so that only works on 32-bit kernels, on 64-bit kernels the check for
> kernel
> addresses is to see whether it's a negative address. PAGE_OFFSET points to
> above
> any hypervisor's address, so even with your fix we could still leak
> hypervisor
> addresses.
>
> I.e. use the kernel_ip() primitive instead.
That's what I've been looking for, thanks!
Regards,
--
Alex
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