diff options
| author | Alexander Potapenko <glider@google.com> | 2024-09-24 15:23:14 +0200 |
|---|---|---|
| committer | Alexander Potapenko <glider@google.com> | 2024-09-25 09:05:57 +0000 |
| commit | 4b1eded1f91812d576538f106b57352d25a6b484 (patch) | |
| tree | 24d63abea11136d185dc9eba0a0ab5eb93f20046 /sys | |
| parent | 7c9588a40bd882410049d1e772de2452934a7eaf (diff) | |
executor: arm64: sys/linux: implement syz_kvm_setup_syzos_vm and syz_kvm_add_vcpu
The old syz_kvm_setup_cpu() API mixed together VM and VCPU setup, making it
harder to create and fuzz two VCPUs in the same VM.
Introduce two new pseudo-syscalls, syz_kvm_setup_syzos_vm() and syz_kvm_add_vcpu(),
that will simplify this task.
syz_kvm_setup_syzos_vm() takes a VM file descriptor, performs VM setup
(allocates guest memory and installs SYZOS code into it) and returns a
new kvm_syz_vm resource, which is in fact a pointer to `struct kvm_syz_vm`
encapsulating VM-specific data in the C code.
syz_kvm_add_vcpu() takes the VM ID denoted by kvm_syz_vm and creates a
new VCPU within that VM with a proper CPU number. It then stores the
fuzzer-supplied SYZOS API sequence into the corresponding part (indexed by
CPU number) of the VM memory slot, and sets up the CPU registers to interpret
that sequence.
The new pseudo-syscall let the fuzzer create independent CPUs that run different
code sequences without interfering with each other.
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/linux/dev_kvm.txt | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/sys/linux/dev_kvm.txt b/sys/linux/dev_kvm.txt index a369be758..bbf7a673b 100644 --- a/sys/linux/dev_kvm.txt +++ b/sys/linux/dev_kvm.txt @@ -266,6 +266,9 @@ syz_kvm_setup_cpu$ppc64(fd fd_kvmvm, cpufd fd_kvmcpu, usermem vma[24], text ptr[ kvm_num_irqs = 32, 64, 128, 256, 512 # This pseudo-syscall is ARM64-specific. syz_kvm_vgic_v3_setup(fd fd_kvmvm, ncpus intptr[0:4], nirqs flags[kvm_num_irqs]) +resource kvm_syz_vm[int64] +syz_kvm_setup_syzos_vm(fd fd_kvmvm) kvm_syz_vm +syz_kvm_add_vcpu(vm kvm_syz_vm, text ptr[in, kvm_text_arm64], opts ptr[in, array[kvm_setup_opt_arm64, 1]], nopt len[opts]) fd_kvmcpu resource kvm_run_ptr[int64] define KVM_RUN_SIZE sizeof(struct kvm_run) |