* 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.
Thanks,
Ingo
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