| // Copyright 2017 syzkaller project authors. All rights reserved. |
| // Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file. |
| |
| #define SYZ_EXECUTOR |
| #include "common_linux.h" |
| |
| #include "syscalls_linux.h" |
| |
| #include <sys/utsname.h> |
| |
| unsigned long long procid; |
| |
| void cover_reset(thread_t*) |
| { |
| } |
| |
| extern "C" int test_copyin() |
| { |
| unsigned char x[4] = {}; |
| STORE_BY_BITMASK(uint16, &x[1], 0x1234, 0, 0); |
| if (x[0] != 0 || x[1] != 0x34 || x[2] != 0x12 || x[3] != 0) { |
| printf("bad result of STORE_BY_BITMASK(0, 0): %x %x %x %x\n", x[0], x[1], x[2], x[3]); |
| return 1; |
| } |
| STORE_BY_BITMASK(uint16, &x[1], 0x555a, 5, 4); |
| if (x[0] != 0 || x[1] != 0x54 || x[2] != 0x13 || x[3] != 0) { |
| printf("bad result of STORE_BY_BITMASK(7, 3): %x %x %x %x\n", x[0], x[1], x[2], x[3]); |
| return 1; |
| } |
| return 0; |
| } |
| |
| #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) |
| |
| struct csum_inet_test { |
| const char* data; |
| size_t length; |
| uint16 csum; |
| }; |
| |
| extern "C" int test_csum_inet() |
| { |
| struct csum_inet_test tests[] = { |
| {// 0 |
| "", |
| 0, |
| 0xffff}, |
| { |
| // 1 |
| "\x00", |
| 1, |
| 0xffff, |
| }, |
| { |
| // 2 |
| "\x00\x00", |
| 2, |
| 0xffff, |
| }, |
| { |
| // 3 |
| "\x00\x00\xff\xff", |
| 4, |
| 0x0000, |
| }, |
| { |
| // 4 |
| "\xfc", |
| 1, |
| 0xff03, |
| }, |
| { |
| // 5 |
| "\xfc\x12", |
| 2, |
| 0xed03, |
| }, |
| { |
| // 6 |
| "\xfc\x12\x3e", |
| 3, |
| 0xecc5, |
| }, |
| { |
| // 7 |
| "\xfc\x12\x3e\x00\xc5\xec", |
| 6, |
| 0x0000, |
| }, |
| { |
| // 8 |
| "\x42\x00\x00\x43\x44\x00\x00\x00\x45\x00\x00\x00\xba\xaa\xbb\xcc\xdd", |
| 17, |
| 0x43e1, |
| }, |
| { |
| // 9 |
| "\x42\x00\x00\x43\x44\x00\x00\x00\x45\x00\x00\x00\xba\xaa\xbb\xcc\xdd\x00", |
| 18, |
| 0x43e1, |
| }, |
| { |
| // 10 |
| "\x00\x00\x42\x00\x00\x43\x44\x00\x00\x00\x45\x00\x00\x00\xba\xaa\xbb\xcc\xdd", |
| 19, |
| 0x43e1, |
| }, |
| { |
| // 11 |
| "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x04\x00\xab\xcd", |
| 15, |
| 0x5032, |
| }, |
| { |
| // 12 |
| "\x00\x00\x12\x34\x56\x78", |
| 6, |
| 0x5397, |
| }, |
| { |
| // 13 |
| "\x00\x00\x12\x34\x00\x00\x56\x78\x00\x06\x00\x04\xab\xcd", |
| 14, |
| 0x7beb, |
| }, |
| { |
| // 14 |
| "\x00\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff\xff\xee\xdd\xcc\xbb\xaa\x99\x88\x77\x66\x55\x44\x33\x22\x11\x00\x00\x00\x00\x04\x00\x00\x00\x06\x00\x00\xab\xcd", |
| 44, |
| 0x2854, |
| }, |
| { |
| // 15 |
| "\x00\x00\x12\x34\x00\x00\x56\x78\x00\x11\x00\x04\xab\xcd", |
| 14, |
| 0x70eb, |
| }, |
| { |
| // 16 |
| "\x00\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff\xff\xee\xdd\xcc\xbb\xaa\x99\x88\x77\x66\x55\x44\x33\x22\x11\x00\x00\x00\x00\x04\x00\x00\x00\x11\x00\x00\xab\xcd", |
| 44, |
| 0x1d54, |
| }, |
| { |
| // 17 |
| "\x00\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff\xff\xee\xdd\xcc\xbb\xaa\x99\x88\x77\x66\x55\x44\x33\x22\x11\x00\x00\x00\x00\x04\x00\x00\x00\x3a\x00\x00\xab\xcd", |
| 44, |
| 0xf453, |
| }}; |
| |
| for (unsigned i = 0; i < ARRAY_SIZE(tests); i++) { |
| struct csum_inet csum; |
| csum_inet_init(&csum); |
| csum_inet_update(&csum, (const uint8*)tests[i].data, tests[i].length); |
| if (csum_inet_digest(&csum) != tests[i].csum) { |
| fprintf(stderr, "bad checksum in test #%u, want: %hx, got: %hx\n", i, tests[i].csum, csum_inet_digest(&csum)); |
| return 1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| int randInt(int start, int end) |
| { |
| return rand() % (end + 1 - start) + start; |
| } |
| |
| extern "C" int test_csum_inet_acc() |
| { |
| uint8 buffer[128]; |
| |
| int test; |
| for (test = 0; test < 256; test++) { |
| int size = randInt(1, 128); |
| int step = randInt(1, 8) * 2; |
| |
| int i; |
| for (i = 0; i < size; i++) |
| buffer[i] = randInt(0, 255); |
| |
| struct csum_inet csum_acc; |
| csum_inet_init(&csum_acc); |
| |
| for (i = 0; i < size / step; i++) |
| csum_inet_update(&csum_acc, &buffer[i * step], step); |
| if (size % step != 0) |
| csum_inet_update(&csum_acc, &buffer[size - size % step], size % step); |
| |
| struct csum_inet csum; |
| csum_inet_init(&csum); |
| csum_inet_update(&csum, &buffer[0], size); |
| |
| if (csum_inet_digest(&csum_acc) != csum_inet_digest(&csum)) |
| return 1; |
| } |
| return 0; |
| } |
| |
| static unsigned host_kernel_version(); |
| static void dump_cpu_state(int cpufd, char* vm_mem); |
| |
| static int test_one(int text_type, const char* text, int text_size, int flags, unsigned reason, bool check_rax) |
| { |
| printf("=== testing text %d, text size 0x%x, flags 0x%x\n", text_type, text_size, flags); |
| int kvmfd = open("/dev/kvm", O_RDWR); |
| if (kvmfd == -1) { |
| if (errno == ENOENT) { |
| printf("/dev/kvm is not present\n"); |
| return -1; |
| } |
| if (errno == EPERM || errno == EACCES) { |
| printf("no permissions to open /dev/kvm\n"); |
| return -1; |
| } |
| printf("failed to open /dev/kvm (%d)\n", errno); |
| return 1; |
| } |
| int vmfd = ioctl(kvmfd, KVM_CREATE_VM, 0); |
| if (vmfd == -1) { |
| printf("KVM_CREATE_VM failed (%d)\n", errno); |
| return 1; |
| } |
| int cpufd = ioctl(vmfd, KVM_CREATE_VCPU, 0); |
| if (cpufd == -1) { |
| printf("KVM_CREATE_VCPU failed (%d)\n", errno); |
| return 1; |
| } |
| int cpu_mem_size = ioctl(kvmfd, KVM_GET_VCPU_MMAP_SIZE, 0); |
| if (cpu_mem_size <= 0) { |
| printf("KVM_GET_VCPU_MMAP_SIZE failed (%d)\n", errno); |
| return 1; |
| } |
| struct kvm_run* cpu_mem = (struct kvm_run*)mmap(0, cpu_mem_size, PROT_READ | PROT_WRITE, MAP_SHARED, cpufd, 0); |
| if (cpu_mem == MAP_FAILED) { |
| printf("cpu mmap failed (%d)\n", errno); |
| return 1; |
| } |
| int vm_mem_size = 96 << 10; |
| void* vm_mem = mmap(0, vm_mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
| if (vm_mem == MAP_FAILED) { |
| printf("mmap failed (%d)\n", errno); |
| return 1; |
| } |
| struct kvm_text kvm_text; |
| kvm_text.typ = text_type; |
| kvm_text.text = text; |
| kvm_text.size = text_size; |
| if (syz_kvm_setup_cpu(vmfd, cpufd, (uintptr_t)vm_mem, (uintptr_t)&kvm_text, 1, flags, 0, 0)) { |
| printf("syz_kvm_setup_cpu failed (%d)\n", errno); |
| return 1; |
| } |
| if (ioctl(cpufd, KVM_RUN, 0)) { |
| printf("KVM_RUN failed (%d)\n", errno); |
| return 1; |
| } |
| struct kvm_regs regs; |
| if (ioctl(cpufd, KVM_GET_REGS, ®s)) { |
| printf("KVM_GET_REGS failed (%d)\n", errno); |
| dump_cpu_state(cpufd, (char*)vm_mem); |
| return 1; |
| } |
| if (cpu_mem->exit_reason != reason) { |
| printf("KVM_RUN exit reason %d, expect %d\n", cpu_mem->exit_reason, reason); |
| if (cpu_mem->exit_reason == KVM_EXIT_FAIL_ENTRY) |
| printf("hardware exit reason 0x%llx\n", cpu_mem->fail_entry.hardware_entry_failure_reason); |
| dump_cpu_state(cpufd, (char*)vm_mem); |
| return 1; |
| } |
| if (check_rax && regs.rax != 0xbadc0de) { |
| printf("wrong result: rax=0x%llx\n", (long long)regs.rax); |
| dump_cpu_state(cpufd, (char*)vm_mem); |
| return 1; |
| } |
| munmap(vm_mem, vm_mem_size); |
| munmap(cpu_mem, cpu_mem_size); |
| close(cpufd); |
| close(vmfd); |
| close(kvmfd); |
| return 0; |
| } |
| |
| extern "C" int test_kvm() |
| { |
| int res; |
| |
| unsigned ver = host_kernel_version(); |
| printf("host kernel version %u\n", ver); |
| |
| // TODO: test VM mode. |
| //const char text16_vm[] = "\x48\xc7\xc3\xde\xc0\xad\x0b\x90\x90\x48\xc7\xc0\xef\xcd\xab\x00\xf4"; |
| //if (res = test_one(64, text16_vm, sizeof(text16_vm) - 1, KVM_SETUP_VM, KVM_EXIT_HLT, true)) |
| // return res; |
| |
| /// TODO: test code executed in interrupt handlers. |
| //const char text32_div0[] = "\x31\xc0\xf7\xf0"; |
| //if (res = test_one(32, text32_div0, sizeof(text32_div0)-1, 0, KVM_EXIT_HLT, true)) |
| // return res; |
| |
| const char text8[] = "\x66\xb8\xde\xc0\xad\x0b"; |
| if ((res = test_one(8, text8, sizeof(text8) - 1, 0, KVM_EXIT_HLT, true))) |
| return res; |
| if ((res = test_one(8, text8, sizeof(text8) - 1, KVM_SETUP_VIRT86, KVM_EXIT_SHUTDOWN, true))) |
| return res; |
| if ((res = test_one(8, text8, sizeof(text8) - 1, KVM_SETUP_VIRT86 | KVM_SETUP_PAGING, KVM_EXIT_SHUTDOWN, true))) |
| return res; |
| |
| const char text16[] = "\x66\xb8\xde\xc0\xad\x0b"; |
| if ((res = test_one(16, text16, sizeof(text16) - 1, 0, KVM_EXIT_HLT, true))) |
| return res; |
| if ((res = test_one(16, text16, sizeof(text16) - 1, KVM_SETUP_CPL3, KVM_EXIT_SHUTDOWN, true))) |
| return res; |
| |
| const char text32[] = "\xb8\xde\xc0\xad\x0b"; |
| if ((res = test_one(32, text32, sizeof(text32) - 1, 0, KVM_EXIT_HLT, true))) |
| return res; |
| if ((res = test_one(32, text32, sizeof(text32) - 1, KVM_SETUP_PAGING, KVM_EXIT_HLT, true))) |
| return res; |
| if ((res = test_one(32, text32, sizeof(text32) - 1, KVM_SETUP_CPL3, KVM_EXIT_SHUTDOWN, true))) |
| return res; |
| |
| const char text64[] = "\x90\xb8\xde\xc0\xad\x0b"; |
| if ((res = test_one(64, text64, sizeof(text64) - 1, 0, KVM_EXIT_HLT, true))) |
| return res; |
| if ((res = test_one(64, text64, sizeof(text64) - 1, KVM_SETUP_PAGING, KVM_EXIT_HLT, true))) |
| return res; |
| if ((res = test_one(64, text64, sizeof(text64) - 1, KVM_SETUP_CPL3, KVM_EXIT_SHUTDOWN, true))) |
| return res; |
| |
| const char text64_sysenter[] = "\xb8\xde\xc0\xad\x0b\x0f\x34"; |
| if ((res = test_one(64, text64_sysenter, sizeof(text64_sysenter) - 1, KVM_SETUP_CPL3, KVM_EXIT_SHUTDOWN, true))) |
| return res; |
| |
| // Note: SMM does not work on 3.13 kernels. |
| if (ver >= 404) { |
| const char text8_smm[] = "\x66\xb8\xde\xc0\xad\x0b"; |
| if ((res = test_one(8, text8_smm, sizeof(text8_smm) - 1, KVM_SETUP_SMM, KVM_EXIT_HLT, true))) |
| return res; |
| if ((res = test_one(8, text8_smm, sizeof(text8_smm) - 1, KVM_SETUP_SMM | KVM_SETUP_PROTECTED, KVM_EXIT_HLT, true))) |
| return res; |
| |
| //const char text32_smm[] = "\xb8\xde\xc0\xad\x0b"; |
| if ((res = test_one(32, text8_smm, sizeof(text8_smm) - 1, KVM_SETUP_SMM, KVM_EXIT_HLT, true))) |
| return res; |
| |
| // Also ensure that we are actually in SMM. |
| // If we do MOV to RAX and then RSM, RAX will be restored to host value so RAX check will fail. |
| // So instead we execute just RSM, if we are in SMM we will get KVM_EXIT_HLT, otherwise KVM_EXIT_INTERNAL_ERROR. |
| const char text_rsm[] = "\x0f\xaa"; |
| if ((res = test_one(8, text_rsm, sizeof(text_rsm) - 1, KVM_SETUP_SMM, KVM_EXIT_HLT, false))) |
| return res; |
| if ((res = test_one(32, text_rsm, sizeof(text_rsm) - 1, KVM_SETUP_SMM, KVM_EXIT_HLT, false))) |
| return res; |
| } |
| |
| return 0; |
| } |
| |
| static unsigned host_kernel_version() |
| { |
| struct utsname name; |
| if (uname(&name)) { |
| printf("uname failed (%d)\n", errno); |
| doexit(1); |
| } |
| unsigned major = atoi(name.release); |
| unsigned minor = 0; |
| if (strchr(name.release, '.')) |
| minor = atoi(strchr(name.release, '.') + 1); |
| return major * 100 + minor; |
| } |
| |
| static void dump_seg(const char* name, struct kvm_segment* seg) |
| { |
| printf("%s: base=0x%llx limit=0x%x sel=0x%x type=%d p=%d dpl=%d, db=%d s=%d l=%d g=%d\n", |
| name, seg->base, seg->limit, seg->selector, seg->type, seg->present, seg->dpl, seg->db, seg->s, seg->l, seg->g); |
| } |
| |
| static void dump_cpu_state(int cpufd, char* vm_mem) |
| { |
| struct kvm_sregs sregs; |
| if (ioctl(cpufd, KVM_GET_SREGS, &sregs)) { |
| printf("KVM_GET_SREGS failed (%d)\n", errno); |
| return; |
| } |
| struct kvm_regs regs; |
| if (ioctl(cpufd, KVM_GET_REGS, ®s)) { |
| printf("KVM_GET_REGS failed (%d)\n", errno); |
| return; |
| } |
| printf("RIP=0x%llx RAX=0x%llx RDX=0x%llx RCX=0x%llx RBX=0x%llx CF=%d ZF=%d\n", |
| regs.rip, regs.rax, regs.rdx, regs.rcx, regs.rbx, !!(regs.rflags & (1 << 0)), !!(regs.rflags & (1 << 6))); |
| printf("CR0=0x%llx CR2=0x%llx CR4=0x%llx EFER=0x%llx\n", |
| sregs.cr0, sregs.cr2, sregs.cr4, sregs.efer); |
| dump_seg("CS", &sregs.cs); |
| dump_seg("SS", &sregs.ss); |
| dump_seg("DS", &sregs.ds); |
| |
| if (false) { |
| printf("memory:\n"); |
| for (int i = 0; i < 0x80; i++) |
| printf("0x%02x: 0x%02x\n", i, ((unsigned char*)vm_mem)[i]); |
| } |
| |
| if (false) { |
| printf("vmcs:\n"); |
| const int vmcs_size = 0x1000; |
| for (int i = 0; i < vmcs_size / 8; i += 4) { |
| printf("0x%04x: 0x%016llx 0x%016llx 0x%016llx 0x%016llx\n", i, |
| ((long long*)vm_mem)[i], ((long long*)vm_mem)[i + 1], ((long long*)vm_mem)[i + 2], ((long long*)vm_mem)[i + 3]); |
| } |
| } |
| } |
