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https://github.com/reactos/syzkaller.git
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80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
// Copyright 2017 syzkaller project authors. All rights reserved.
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// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
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// This file is shared between executor and csource package.
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// Implementation of syz_kvm_setup_cpu pseudo-syscall.
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struct kvm_text {
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uintptr_t typ;
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const void* text;
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uintptr_t size;
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};
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struct kvm_opt {
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uint64 typ;
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uint64 val;
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};
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// syz_kvm_setup_cpu(fd fd_kvmvm, cpufd fd_kvmcpu, usermem vma[24], text ptr[in, array[kvm_text, 1]], ntext len[text], flags flags[kvm_setup_flags], opts ptr[in, array[kvm_setup_opt, 0:2]], nopt len[opts])
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static long syz_kvm_setup_cpu(volatile long a0, volatile long a1, volatile long a2, volatile long a3, volatile long a4, volatile long a5, volatile long a6, volatile long a7)
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{
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const int vmfd = a0;
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const int cpufd = a1;
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char* const host_mem = (char*)a2;
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const struct kvm_text* const text_array_ptr = (struct kvm_text*)a3;
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const uintptr_t text_count = a4;
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const uintptr_t flags = a5;
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const struct kvm_opt* const opt_array_ptr = (struct kvm_opt*)a6;
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uintptr_t opt_count = a7;
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(void)flags;
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(void)opt_count;
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const uintptr_t page_size = 4 << 10;
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const uintptr_t guest_mem = 0;
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const uintptr_t guest_mem_size = 24 * page_size;
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(void)text_count; // fuzzer can spoof count and we need just 1 text, so ignore text_count
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int text_type = text_array_ptr[0].typ;
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const void* text = text_array_ptr[0].text;
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int text_size = text_array_ptr[0].size;
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(void)text_type;
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(void)opt_array_ptr;
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uint32 features = 0;
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if (opt_count > 1)
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opt_count = 1;
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uintptr_t i;
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for (i = 0; i < opt_count; i++) {
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uint64 typ = opt_array_ptr[i].typ;
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uint64 val = opt_array_ptr[i].val;
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switch (typ) {
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case 1:
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features = val;
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break;
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}
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}
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for (i = 0; i < guest_mem_size / page_size; i++) {
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struct kvm_userspace_memory_region memreg;
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memreg.slot = i;
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memreg.flags = 0; // can be KVM_MEM_LOG_DIRTY_PAGES | KVM_MEM_READONLY
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memreg.guest_phys_addr = guest_mem + i * page_size;
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memreg.memory_size = page_size;
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memreg.userspace_addr = (uintptr_t)host_mem + i * page_size;
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ioctl(vmfd, KVM_SET_USER_MEMORY_REGION, &memreg);
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}
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struct kvm_vcpu_init init;
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ioctl(cpufd, KVM_ARM_PREFERRED_TARGET, &init);
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init.features[0] = features;
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ioctl(cpufd, KVM_ARM_VCPU_INIT, &init);
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if (text_size > 1000)
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text_size = 1000;
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memcpy(host_mem, text, text_size);
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return 0;
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}
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