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I am using KVM-Nyx on Ubuntu 20.04 with a processor that supports intel-pt.
I was following the tutorial listed here: https://github.com/Kharos102/kAFL/blob/master/docs/windows_tutorial.md
Whenever I run this command,
/kAFL/qemu-5.0.0/x86_64-softmmu/qemu-system-x86_64 -machine q35 -enable-kvm -m 1024 -hda ./windows.qcow2 -cdrom ./windows.iso
the qemu binary crashes with the following error
qemu-system-x86_64: /home/blank/Downloads/kAFL/kafl/qemu/nyx/pt.c:326: pt_pre_kvm_run: Assertion `cpu->pt_mmap != (void*)0xFFFFFFFFFFFFFFFF' failed.
How should I fix this?
Hi,
I have a question regarding the size of the ToPA buffer.
I found that the value returned by the ioctl KVM_VMX_PT_GET_TOPA_SIZE
is controlled by the constants TOPA_MAIN_SIZE and TOPA_FALLBACK_SIZE.
Is this value determined empirically or constrained by some other dependent factors ?
I am using KVM-Nyx on a processor that supports Intel PT.
I've installed the kernel according to the installation instructions provided here : https://intellabs.github.io/kAFL/tutorials/installation.html
And I have verified that the kafl kernel is being used
$ uname -a
Linux jay 5.10.73-kafl+ #1 SMP Fri Mar 18 13:20:22 CET 2022 x86_64 x86_64 x86_64 GNU/Linux
However, when I try to run the tests under usermode-test/
, I do not see any output of the Intel PT data stream.
I compiled the tests using usermode-test/compile.sh
and upon running test-verbose
, the output is as follows
$ ./test_verbose
KVM-PT: CPU supports 2 IP filters!
KVM_VMX_PT_GET_TOPA_SIZE: 0x410000
KVM_EXIT_IO
KVM_EXIT_IO
KVM_EXIT_IO
KVM_EXIT_IO
KVM_EXIT_HLT (Final ToPA dump)
$
I was wondering if this was the intended result or if Intel PT is supposed to be generating some output here ?
Please advise.
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