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syzkaller/csource/common.go

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// AUTOGENERATED FROM executor/common.h
package csource
var commonHeader = `
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <linux/capability.h>
#include <linux/if.h>
#include <linux/if_tun.h>
#include <linux/kvm.h>
#include <linux/sched.h>
#include <net/if_arp.h>
#include <assert.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <pthread.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
const int kFailStatus = 67;
const int kErrorStatus = 68;
const int kRetryStatus = 69;
__attribute__((noreturn)) void doexit(int status)
{
volatile unsigned i;
syscall(__NR_exit_group, status);
for (i = 0;; i++) {
}
}
#if defined(SYZ_EXECUTOR)
#define exit use_doexit_instead
#define _exit use_doexit_instead
#endif
__attribute__((noreturn)) void fail(const char* msg, ...)
{
int e = errno;
fflush(stdout);
va_list args;
va_start(args, msg);
vfprintf(stderr, msg, args);
va_end(args);
fprintf(stderr, " (errno %d)\n", e);
doexit(e == ENOMEM ? kRetryStatus : kFailStatus);
}
#if defined(SYZ_EXECUTOR)
__attribute__((noreturn)) void error(const char* msg, ...)
{
fflush(stdout);
va_list args;
va_start(args, msg);
vfprintf(stderr, msg, args);
va_end(args);
fprintf(stderr, "\n");
doexit(kErrorStatus);
}
#endif
__attribute__((noreturn)) void exitf(const char* msg, ...)
{
int e = errno;
fflush(stdout);
va_list args;
va_start(args, msg);
vfprintf(stderr, msg, args);
va_end(args);
fprintf(stderr, " (errno %d)\n", e);
doexit(kRetryStatus);
}
static int flag_debug;
void debug(const char* msg, ...)
{
if (!flag_debug)
return;
va_list args;
va_start(args, msg);
vfprintf(stdout, msg, args);
va_end(args);
fflush(stdout);
}
__thread int skip_segv;
__thread jmp_buf segv_env;
static void segv_handler(int sig, siginfo_t* info, void* uctx)
{
if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED))
_longjmp(segv_env, 1);
doexit(sig);
for (;;) {
}
}
static void install_segv_handler()
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_sigaction = segv_handler;
sa.sa_flags = SA_NODEFER | SA_SIGINFO;
sigaction(SIGSEGV, &sa, NULL);
sigaction(SIGBUS, &sa, NULL);
}
#define NONFAILING(...) \
{ \
__atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \
if (_setjmp(segv_env) == 0) { \
__VA_ARGS__; \
} \
__atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \
}
#define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1)
#define BITMASK_LEN_OFF(type, bf_off, bf_len) (type)(BITMASK_LEN(type, (bf_len)) << (bf_off))
#define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len) \
if ((bf_off) == 0 && (bf_len) == 0) { \
*(type*)(addr) = (type)(val); \
} else { \
type new_val = *(type*)(addr); \
new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len)); \
new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off); \
*(type*)(addr) = new_val; \
}
#ifdef __NR_syz_emit_ethernet
static void vsnprintf_check(char* str, size_t size, const char* format, va_list args)
{
int rv;
rv = vsnprintf(str, size, format, args);
if (rv < 0)
fail("tun: snprintf failed");
if ((size_t)rv >= size)
fail("tun: string '%s...' doesn't fit into buffer", str);
}
static void snprintf_check(char* str, size_t size, const char* format, ...)
{
va_list args;
va_start(args, format);
vsnprintf_check(str, size, format, args);
va_end(args);
}
#define COMMAND_MAX_LEN 128
static void execute_command(const char* format, ...)
{
va_list args;
char command[COMMAND_MAX_LEN];
va_start(args, format);
vsnprintf_check(command, sizeof(command), format, args);
if (system(command) < 0)
fail("tun: command \"%s\" failed", &command[0]);
va_end(args);
}
int tunfd = -1;
#define MAX_PIDS 32
#define ADDR_MAX_LEN 32
#define LOCAL_MAC "aa:aa:aa:aa:aa:%02hx"
#define REMOTE_MAC "bb:bb:bb:bb:bb:%02hx"
#define LOCAL_IPV4 "192.168.%d.170"
#define REMOTE_IPV4 "192.168.%d.187"
#define LOCAL_IPV6 "fd00::%02hxaa"
#define REMOTE_IPV6 "fd00::%02hxbb"
static void initialize_tun(uint64_t pid)
{
if (getuid() != 0)
return;
if (pid >= MAX_PIDS)
fail("tun: no more than %d executors", MAX_PIDS);
int id = pid + 250 - MAX_PIDS;
tunfd = open("/dev/net/tun", O_RDWR);
if (tunfd == -1)
fail("tun: can't open /dev/net/tun");
char iface[IFNAMSIZ];
snprintf_check(iface, sizeof(iface), "syz%d", id);
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, iface, IFNAMSIZ);
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0)
fail("tun: ioctl(TUNSETIFF) failed");
char local_mac[ADDR_MAX_LEN];
snprintf_check(local_mac, sizeof(local_mac), LOCAL_MAC, id);
char remote_mac[ADDR_MAX_LEN];
snprintf_check(remote_mac, sizeof(remote_mac), REMOTE_MAC, id);
char local_ipv4[ADDR_MAX_LEN];
snprintf_check(local_ipv4, sizeof(local_ipv4), LOCAL_IPV4, id);
char remote_ipv4[ADDR_MAX_LEN];
snprintf_check(remote_ipv4, sizeof(remote_ipv4), REMOTE_IPV4, id);
char local_ipv6[ADDR_MAX_LEN];
snprintf_check(local_ipv6, sizeof(local_ipv6), LOCAL_IPV6, id);
char remote_ipv6[ADDR_MAX_LEN];
snprintf_check(remote_ipv6, sizeof(remote_ipv6), REMOTE_IPV6, id);
execute_command("ip link set dev %s address %s", iface, local_mac);
execute_command("ip addr add %s/24 dev %s", local_ipv4, iface);
execute_command("ip -6 addr add %s/120 dev %s", local_ipv6, iface);
execute_command("ip neigh add %s lladdr %s dev %s nud permanent", remote_ipv4, remote_mac, iface);
execute_command("ip -6 neigh add %s lladdr %s dev %s nud permanent", remote_ipv6, remote_mac, iface);
execute_command("ip link set %s up", iface);
}
static uintptr_t syz_emit_ethernet(uintptr_t a0, uintptr_t a1)
{
if (tunfd < 0)
return (uintptr_t)-1;
int64_t length = a0;
char* data = (char*)a1;
return write(tunfd, data, length);
}
#endif
#ifdef __NR_syz_open_dev
static uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2)
{
if (a0 == 0xc || a0 == 0xb) {
char buf[128];
sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1, (uint8_t)a2);
return open(buf, O_RDWR, 0);
} else {
char buf[1024];
char* hash;
NONFAILING(strncpy(buf, (char*)a0, sizeof(buf)));
buf[sizeof(buf) - 1] = 0;
while ((hash = strchr(buf, '#'))) {
*hash = '0' + (char)(a1 % 10);
a1 /= 10;
}
return open(buf, a2, 0);
}
}
#endif
#ifdef __NR_syz_open_pts
static uintptr_t syz_open_pts(uintptr_t a0, uintptr_t a1)
{
int ptyno = 0;
if (ioctl(a0, TIOCGPTN, &ptyno))
return -1;
char buf[128];
sprintf(buf, "/dev/pts/%d", ptyno);
return open(buf, a1, 0);
}
#endif
#ifdef __NR_syz_fuse_mount
static uintptr_t syz_fuse_mount(uintptr_t a0, uintptr_t a1, uintptr_t a2, uintptr_t a3, uintptr_t a4, uintptr_t a5)
{
uint64_t target = a0;
uint64_t mode = a1;
uint64_t uid = a2;
uint64_t gid = a3;
uint64_t maxread = a4;
uint64_t flags = a5;
int fd = open("/dev/fuse", O_RDWR);
if (fd == -1)
return fd;
char buf[1024];
sprintf(buf, "fd=%d,user_id=%ld,group_id=%ld,rootmode=0%o", fd, (long)uid, (long)gid, (unsigned)mode & ~3u);
if (maxread != 0)
sprintf(buf + strlen(buf), ",max_read=%ld", (long)maxread);
if (mode & 1)
strcat(buf, ",default_permissions");
if (mode & 2)
strcat(buf, ",allow_other");
syscall(SYS_mount, "", target, "fuse", flags, buf);
return fd;
}
#endif
#ifdef __NR_syz_fuseblk_mount
static uintptr_t syz_fuseblk_mount(uintptr_t a0, uintptr_t a1, uintptr_t a2, uintptr_t a3, uintptr_t a4, uintptr_t a5, uintptr_t a6, uintptr_t a7)
{
uint64_t target = a0;
uint64_t blkdev = a1;
uint64_t mode = a2;
uint64_t uid = a3;
uint64_t gid = a4;
uint64_t maxread = a5;
uint64_t blksize = a6;
uint64_t flags = a7;
int fd = open("/dev/fuse", O_RDWR);
if (fd == -1)
return fd;
if (syscall(SYS_mknodat, AT_FDCWD, blkdev, S_IFBLK, makedev(7, 199)))
return fd;
char buf[256];
sprintf(buf, "fd=%d,user_id=%ld,group_id=%ld,rootmode=0%o", fd, (long)uid, (long)gid, (unsigned)mode & ~3u);
if (maxread != 0)
sprintf(buf + strlen(buf), ",max_read=%ld", (long)maxread);
if (blksize != 0)
sprintf(buf + strlen(buf), ",blksize=%ld", (long)blksize);
if (mode & 1)
strcat(buf, ",default_permissions");
if (mode & 2)
strcat(buf, ",allow_other");
syscall(SYS_mount, blkdev, target, "fuseblk", flags, buf);
return fd;
}
#endif
#ifdef __NR_syz_kvm_setup_cpu
#if defined(__x86_64__)
const char kvm_asm16_cpl3[] = "\x0f\x20\xc0\x66\x83\xc8\x01\x0f\x22\xc0\xb8\xa0\x00\x0f\x00\xd8\xb8\x2b\x00\x8e\xd8\x8e\xc0\x8e\xe0\x8e\xe8\xbc\x00\x01\xc7\x06\x00\x01\x1d\xba\xc7\x06\x02\x01\x23\x00\xc7\x06\x04\x01\x00\x01\xc7\x06\x06\x01\x2b\x00\xcb";
const char kvm_asm32_paged[] = "\x0f\x20\xc0\x0d\x00\x00\x00\x80\x0f\x22\xc0";
const char kvm_asm32_vm86[] = "\x66\xb8\xb8\x00\x0f\x00\xd8\xea\x00\x00\x00\x00\xd0\x00";
const char kvm_asm32_paged_vm86[] = "\x0f\x20\xc0\x0d\x00\x00\x00\x80\x0f\x22\xc0\x66\xb8\xb8\x00\x0f\x00\xd8\xea\x00\x00\x00\x00\xd0\x00";
const char kvm_asm64_vm86[] = "\x0f\x20\xc0\x0d\x00\x00\x00\x80\x0f\x22\xc0\x66\xb8\xb8\x00\x0f\x00\xd8\xea\x00\x00\x00\x00\xd0\x00";
const char kvm_asm64_enable_long[] = "\x0f\x20\xc0\x0d\x00\x00\x00\x80\x0f\x22\xc0\xea\xde\xc0\xad\x0b\x50\x00\x48\xc7\xc0\xd8\x00\x00\x00\x0f\x00\xd8";
const char kvm_asm64_init_vm[] = 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const char kvm_asm64_vm_exit[] = "\x48\xc7\xc3\x00\x44\x00\x00\x0f\x78\xda\x48\xc7\xc3\x02\x44\x00\x00\x0f\x78\xd9\x48\xc7\xc0\x00\x64\x00\x00\x0f\x78\xc0\x48\xc7\xc3\x1e\x68\x00\x00\x0f\x78\xdb\xf4";
const char kvm_asm64_cpl3[] = "\x0f\x20\xc0\x0d\x00\x00\x00\x80\x0f\x22\xc0\xea\xde\xc0\xad\x0b\x50\x00\x48\xc7\xc0\xd8\x00\x00\x00\x0f\x00\xd8\x48\xc7\xc0\x6b\x00\x00\x00\x8e\xd8\x8e\xc0\x8e\xe0\x8e\xe8\x48\xc7\xc4\x80\x0f\x00\x00\x48\xc7\x04\x24\x1d\xba\x00\x00\x48\xc7\x44\x24\x04\x63\x00\x00\x00\x48\xc7\x44\x24\x08\x80\x0f\x00\x00\x48\xc7\x44\x24\x0c\x6b\x00\x00\x00\xcb";
#define ADDR_TEXT 0x0000
#define ADDR_GDT 0x1000
#define ADDR_LDT 0x1800
#define ADDR_PML4 0x2000
#define ADDR_PDP 0x3000
#define ADDR_PD 0x4000
#define ADDR_STACK0 0x0f80
#define ADDR_VAR_HLT 0x2800
#define ADDR_VAR_SYSRET 0x2808
#define ADDR_VAR_SYSEXIT 0x2810
#define ADDR_VAR_IDT 0x3800
#define ADDR_VAR_TSS64 0x3a00
#define ADDR_VAR_TSS64_CPL3 0x3c00
#define ADDR_VAR_TSS16 0x3d00
#define ADDR_VAR_TSS16_2 0x3e00
#define ADDR_VAR_TSS16_CPL3 0x3f00
#define ADDR_VAR_TSS32 0x4800
#define ADDR_VAR_TSS32_2 0x4a00
#define ADDR_VAR_TSS32_CPL3 0x4c00
#define ADDR_VAR_TSS32_VM86 0x4e00
#define ADDR_VAR_VMXON_PTR 0x5f00
#define ADDR_VAR_VMCS_PTR 0x5f08
#define ADDR_VAR_VMEXIT_PTR 0x5f10
#define ADDR_VAR_VMXON 0x6000
#define ADDR_VAR_VMCS 0x7000
#define ADDR_VAR_VMEXIT_CODE 0x9000
#define ADDR_VAR_USER_CODE 0x9100
#define ADDR_VAR_USER_CODE2 0x9120
#define SEL_LDT (1 << 3)
#define SEL_CS16 (2 << 3)
#define SEL_DS16 (3 << 3)
#define SEL_CS16_CPL3 ((4 << 3) + 3)
#define SEL_DS16_CPL3 ((5 << 3) + 3)
#define SEL_CS32 (6 << 3)
#define SEL_DS32 (7 << 3)
#define SEL_CS32_CPL3 ((8 << 3) + 3)
#define SEL_DS32_CPL3 ((9 << 3) + 3)
#define SEL_CS64 (10 << 3)
#define SEL_DS64 (11 << 3)
#define SEL_CS64_CPL3 ((12 << 3) + 3)
#define SEL_DS64_CPL3 ((13 << 3) + 3)
#define SEL_CGATE16 (14 << 3)
#define SEL_TGATE16 (15 << 3)
#define SEL_CGATE32 (16 << 3)
#define SEL_TGATE32 (17 << 3)
#define SEL_CGATE64 (18 << 3)
#define SEL_CGATE64_HI (19 << 3)
#define SEL_TSS16 (20 << 3)
#define SEL_TSS16_2 (21 << 3)
#define SEL_TSS16_CPL3 ((22 << 3) + 3)
#define SEL_TSS32 (23 << 3)
#define SEL_TSS32_2 (24 << 3)
#define SEL_TSS32_CPL3 ((25 << 3) + 3)
#define SEL_TSS32_VM86 (26 << 3)
#define SEL_TSS64 (27 << 3)
#define SEL_TSS64_HI (28 << 3)
#define SEL_TSS64_CPL3 ((29 << 3) + 3)
#define SEL_TSS64_CPL3_HI (30 << 3)
#define MSR_IA32_FEATURE_CONTROL 0x3a
#define MSR_IA32_VMX_BASIC 0x480
#define MSR_IA32_SMBASE 0x9e
#define MSR_IA32_SYSENTER_CS 0x174
#define MSR_IA32_SYSENTER_ESP 0x175
#define MSR_IA32_SYSENTER_EIP 0x176
#define MSR_IA32_STAR 0xC0000081
#define MSR_IA32_LSTAR 0xC0000082
#define MSR_IA32_VMX_PROCBASED_CTLS2 0x48B
#define NEXT_INSN $0xbadc0de
#define PREFIX_SIZE 0xba1d
#ifndef KVM_SMI
#define KVM_SMI _IO(KVMIO, 0xb7)
#endif
#define CR0_PE 1
#define CR0_MP (1 << 1)
#define CR0_EM (1 << 2)
#define CR0_TS (1 << 3)
#define CR0_ET (1 << 4)
#define CR0_NE (1 << 5)
#define CR0_WP (1 << 16)
#define CR0_AM (1 << 18)
#define CR0_NW (1 << 29)
#define CR0_CD (1 << 30)
#define CR0_PG (1 << 31)
#define CR4_VME 1
#define CR4_PVI (1 << 1)
#define CR4_TSD (1 << 2)
#define CR4_DE (1 << 3)
#define CR4_PSE (1 << 4)
#define CR4_PAE (1 << 5)
#define CR4_MCE (1 << 6)
#define CR4_PGE (1 << 7)
#define CR4_PCE (1 << 8)
#define CR4_OSFXSR (1 << 8)
#define CR4_OSXMMEXCPT (1 << 10)
#define CR4_UMIP (1 << 11)
#define CR4_VMXE (1 << 13)
#define CR4_SMXE (1 << 14)
#define CR4_FSGSBASE (1 << 16)
#define CR4_PCIDE (1 << 17)
#define CR4_OSXSAVE (1 << 18)
#define CR4_SMEP (1 << 20)
#define CR4_SMAP (1 << 21)
#define CR4_PKE (1 << 22)
#define EFER_SCE 1
#define EFER_LME (1 << 8)
#define EFER_LMA (1 << 10)
#define EFER_NXE (1 << 11)
#define EFER_SVME (1 << 12)
#define EFER_LMSLE (1 << 13)
#define EFER_FFXSR (1 << 14)
#define EFER_TCE (1 << 15)
#define PDE32_PRESENT 1
#define PDE32_RW (1 << 1)
#define PDE32_USER (1 << 2)
#define PDE32_PS (1 << 7)
#define PDE64_PRESENT 1
#define PDE64_RW (1 << 1)
#define PDE64_USER (1 << 2)
#define PDE64_ACCESSED (1 << 5)
#define PDE64_DIRTY (1 << 6)
#define PDE64_PS (1 << 7)
#define PDE64_G (1 << 8)
struct tss16 {
uint16_t prev;
uint16_t sp0;
uint16_t ss0;
uint16_t sp1;
uint16_t ss1;
uint16_t sp2;
uint16_t ss2;
uint16_t ip;
uint16_t flags;
uint16_t ax;
uint16_t cx;
uint16_t dx;
uint16_t bx;
uint16_t sp;
uint16_t bp;
uint16_t si;
uint16_t di;
uint16_t es;
uint16_t cs;
uint16_t ss;
uint16_t ds;
uint16_t ldt;
} __attribute__((packed));
struct tss32 {
uint16_t prev, prevh;
uint32_t sp0;
uint16_t ss0, ss0h;
uint32_t sp1;
uint16_t ss1, ss1h;
uint32_t sp2;
uint16_t ss2, ss2h;
uint32_t cr3;
uint32_t ip;
uint32_t flags;
uint32_t ax;
uint32_t cx;
uint32_t dx;
uint32_t bx;
uint32_t sp;
uint32_t bp;
uint32_t si;
uint32_t di;
uint16_t es, esh;
uint16_t cs, csh;
uint16_t ss, ssh;
uint16_t ds, dsh;
uint16_t fs, fsh;
uint16_t gs, gsh;
uint16_t ldt, ldth;
uint16_t trace;
uint16_t io_bitmap;
} __attribute__((packed));
struct tss64 {
uint32_t reserved0;
uint64_t rsp[3];
uint64_t reserved1;
uint64_t ist[7];
uint64_t reserved2;
uint32_t reserved3;
uint32_t io_bitmap;
} __attribute__((packed));
static void fill_segment_descriptor(uint64_t* dt, uint64_t* lt, struct kvm_segment* seg)
{
uint16_t index = seg->selector >> 3;
uint64_t limit = seg->g ? seg->limit >> 12 : seg->limit;
uint64_t sd = (limit & 0xffff) | (seg->base & 0xffffff) << 16 | (uint64_t)seg->type << 40 | (uint64_t)seg->s << 44 | (uint64_t)seg->dpl << 45 | (uint64_t)seg->present << 47 | (limit & 0xf0000ULL) << 48 | (uint64_t)seg->avl << 52 | (uint64_t)seg->l << 53 | (uint64_t)seg->db << 54 | (uint64_t)seg->g << 55 | (seg->base & 0xff000000ULL) << 56;
NONFAILING(dt[index] = sd);
NONFAILING(lt[index] = sd);
}
static void fill_segment_descriptor_dword(uint64_t* dt, uint64_t* lt, struct kvm_segment* seg)
{
fill_segment_descriptor(dt, lt, seg);
uint16_t index = seg->selector >> 3;
NONFAILING(dt[index + 1] = 0);
NONFAILING(lt[index + 1] = 0);
}
static void setup_syscall_msrs(int cpufd, uint16_t sel_cs, uint16_t sel_cs_cpl3)
{
char buf[sizeof(struct kvm_msrs) + 5 * sizeof(struct kvm_msr_entry)];
memset(buf, 0, sizeof(buf));
struct kvm_msrs* msrs = (struct kvm_msrs*)buf;
msrs->nmsrs = 5;
msrs->entries[0].index = MSR_IA32_SYSENTER_CS;
msrs->entries[0].data = sel_cs;
msrs->entries[1].index = MSR_IA32_SYSENTER_ESP;
msrs->entries[1].data = ADDR_STACK0;
msrs->entries[2].index = MSR_IA32_SYSENTER_EIP;
msrs->entries[2].data = ADDR_VAR_SYSEXIT;
msrs->entries[3].index = MSR_IA32_STAR;
msrs->entries[3].data = ((uint64_t)sel_cs << 32) | ((uint64_t)sel_cs_cpl3 << 48);
msrs->entries[4].index = MSR_IA32_LSTAR;
msrs->entries[4].data = ADDR_VAR_SYSRET;
ioctl(cpufd, KVM_SET_MSRS, msrs);
}
static void setup_32bit_idt(struct kvm_sregs* sregs, char* host_mem, uintptr_t guest_mem)
{
sregs->idt.base = guest_mem + ADDR_VAR_IDT;
sregs->idt.limit = 0x1ff;
uint64_t* idt = (uint64_t*)(host_mem + sregs->idt.base);
int i;
for (i = 0; i < 32; i++) {
struct kvm_segment gate;
gate.selector = i << 3;
switch (i % 6) {
case 0:
gate.type = 6;
gate.base = SEL_CS16;
break;
case 1:
gate.type = 7;
gate.base = SEL_CS16;
break;
case 2:
gate.type = 3;
gate.base = SEL_TGATE16;
break;
case 3:
gate.type = 14;
gate.base = SEL_CS32;
break;
case 4:
gate.type = 15;
gate.base = SEL_CS32;
break;
case 6:
gate.type = 11;
gate.base = SEL_TGATE32;
break;
}
gate.limit = guest_mem + ADDR_VAR_USER_CODE2;
gate.present = 1;
gate.dpl = 0;
gate.s = 0;
gate.g = 0;
gate.db = 0;
gate.l = 0;
gate.avl = 0;
fill_segment_descriptor(idt, idt, &gate);
}
}
static void setup_64bit_idt(struct kvm_sregs* sregs, char* host_mem, uintptr_t guest_mem)
{
sregs->idt.base = guest_mem + ADDR_VAR_IDT;
sregs->idt.limit = 0x1ff;
uint64_t* idt = (uint64_t*)(host_mem + sregs->idt.base);
int i;
for (i = 0; i < 32; i++) {
struct kvm_segment gate;
gate.selector = (i * 2) << 3;
gate.type = (i & 1) ? 14 : 15;
gate.base = SEL_CS64;
gate.limit = guest_mem + ADDR_VAR_USER_CODE2;
gate.present = 1;
gate.dpl = 0;
gate.s = 0;
gate.g = 0;
gate.db = 0;
gate.l = 0;
gate.avl = 0;
fill_segment_descriptor_dword(idt, idt, &gate);
}
}
struct kvm_text {
uintptr_t typ;
const void* text;
uintptr_t size;
};
struct kvm_opt {
uint64_t typ;
uint64_t val;
};
#define KVM_SETUP_PAGING (1 << 0)
#define KVM_SETUP_PAE (1 << 1)
#define KVM_SETUP_PROTECTED (1 << 2)
#define KVM_SETUP_CPL3 (1 << 3)
#define KVM_SETUP_VIRT86 (1 << 4)
#define KVM_SETUP_SMM (1 << 5)
#define KVM_SETUP_VM (1 << 6)
static uintptr_t syz_kvm_setup_cpu(uintptr_t a0, uintptr_t a1, uintptr_t a2, uintptr_t a3, uintptr_t a4, uintptr_t a5, uintptr_t a6, uintptr_t a7)
{
const int vmfd = a0;
const int cpufd = a1;
char* const host_mem = (char*)a2;
const struct kvm_text* const text_array_ptr = (struct kvm_text*)a3;
const uintptr_t text_count = a4;
const uintptr_t flags = a5;
const struct kvm_opt* const opt_array_ptr = (struct kvm_opt*)a6;
uintptr_t opt_count = a7;
const uintptr_t page_size = 4 << 10;
const uintptr_t ioapic_page = 10;
const uintptr_t guest_mem_size = 24 * page_size;
const uintptr_t guest_mem = 0;
(void)text_count;
int text_type = 0;
const void* text = 0;
int text_size = 0;
NONFAILING(text_type = text_array_ptr[0].typ);
NONFAILING(text = text_array_ptr[0].text);
NONFAILING(text_size = text_array_ptr[0].size);
uintptr_t i;
for (i = 0; i < guest_mem_size / page_size; i++) {
struct kvm_userspace_memory_region memreg;
memreg.slot = i;
memreg.flags = 0;
memreg.guest_phys_addr = guest_mem + i * page_size;
if (i == ioapic_page)
memreg.guest_phys_addr = 0xfec00000;
memreg.memory_size = page_size;
memreg.userspace_addr = (uintptr_t)host_mem + i * page_size;
ioctl(vmfd, KVM_SET_USER_MEMORY_REGION, &memreg);
}
struct kvm_userspace_memory_region memreg;
memreg.slot = 1 + (1 << 16);
memreg.flags = 0;
memreg.guest_phys_addr = 0x30000;
memreg.memory_size = 64 << 10;
memreg.userspace_addr = (uintptr_t)host_mem;
ioctl(vmfd, KVM_SET_USER_MEMORY_REGION, &memreg);
struct kvm_sregs sregs;
if (ioctl(cpufd, KVM_GET_SREGS, &sregs))
return -1;
struct kvm_regs regs;
memset(&regs, 0, sizeof(regs));
regs.rip = guest_mem + ADDR_TEXT;
regs.rsp = ADDR_STACK0;
if (opt_count > 2)
opt_count = 2;
for (i = 0; i < opt_count; i++) {
uint64_t typ = 0;
uint64_t val = 0;
NONFAILING(typ = opt_array_ptr[i].typ);
NONFAILING(val = opt_array_ptr[i].val);
switch (typ) {
case 1:
sregs.cr0 ^= val & (CR0_MP | CR0_EM | CR0_ET | CR0_NE | CR0_WP | CR0_AM | CR0_NW | CR0_CD);
break;
case 2:
sregs.cr4 ^= val & (CR4_VME | CR4_PVI | CR4_TSD | CR4_DE | CR4_MCE | CR4_PGE | CR4_PCE |
CR4_OSFXSR | CR4_OSXMMEXCPT | CR4_UMIP | CR4_VMXE | CR4_SMXE | CR4_FSGSBASE | CR4_PCIDE |
CR4_OSXSAVE | CR4_SMEP | CR4_SMAP | CR4_PKE);
break;
case 3:
sregs.efer ^= val & (EFER_SCE | EFER_NXE | EFER_SVME | EFER_LMSLE | EFER_FFXSR | EFER_TCE);
break;
case 4:
regs.rflags ^= val & ((1 << 8) | (1 << 9) | (1 << 10) | (1 << 12) | (1 << 13) | (1 << 14) |
(1 << 15) | (1 << 18) | (1 << 19) | (1 << 20) | (1 << 21));
break;
}
}
regs.rflags |= 2;
sregs.gdt.base = guest_mem + ADDR_GDT;
sregs.gdt.limit = 256 * sizeof(uint64_t) - 1;
uint64_t* gdt = (uint64_t*)(host_mem + sregs.gdt.base);
struct kvm_segment seg_ldt;
seg_ldt.selector = SEL_LDT;
seg_ldt.type = 2;
seg_ldt.base = guest_mem + ADDR_LDT;
seg_ldt.limit = 256 * sizeof(uint64_t) - 1;
seg_ldt.present = 1;
seg_ldt.dpl = 0;
seg_ldt.s = 0;
seg_ldt.g = 0;
seg_ldt.db = 1;
seg_ldt.l = 0;
uint64_t* ldt = (uint64_t*)(host_mem + sregs.ldt.base);
fill_segment_descriptor(gdt, ldt, &seg_ldt);
sregs.ldt = seg_ldt;
struct kvm_segment seg_cs16;
seg_cs16.selector = SEL_CS16;
seg_cs16.type = 11;
seg_cs16.base = 0;
seg_cs16.limit = 0xfffff;
seg_cs16.present = 1;
seg_cs16.dpl = 0;
seg_cs16.s = 1;
seg_cs16.g = 0;
seg_cs16.db = 0;
seg_cs16.l = 0;
fill_segment_descriptor(gdt, ldt, &seg_cs16);
struct kvm_segment seg_ds16 = seg_cs16;
seg_ds16.selector = SEL_DS16;
seg_ds16.type = 3;
fill_segment_descriptor(gdt, ldt, &seg_ds16);
struct kvm_segment seg_cs16_cpl3 = seg_cs16;
seg_cs16_cpl3.selector = SEL_CS16_CPL3;
seg_cs16_cpl3.dpl = 3;
fill_segment_descriptor(gdt, ldt, &seg_cs16_cpl3);
struct kvm_segment seg_ds16_cpl3 = seg_ds16;
seg_ds16_cpl3.selector = SEL_DS16_CPL3;
seg_ds16_cpl3.dpl = 3;
fill_segment_descriptor(gdt, ldt, &seg_ds16_cpl3);
struct kvm_segment seg_cs32 = seg_cs16;
seg_cs32.selector = SEL_CS32;
seg_cs32.db = 1;
fill_segment_descriptor(gdt, ldt, &seg_cs32);
struct kvm_segment seg_ds32 = seg_ds16;
seg_ds32.selector = SEL_DS32;
seg_ds32.db = 1;
fill_segment_descriptor(gdt, ldt, &seg_ds32);
struct kvm_segment seg_cs32_cpl3 = seg_cs32;
seg_cs32_cpl3.selector = SEL_CS32_CPL3;
seg_cs32_cpl3.dpl = 3;
fill_segment_descriptor(gdt, ldt, &seg_cs32_cpl3);
struct kvm_segment seg_ds32_cpl3 = seg_ds32;
seg_ds32_cpl3.selector = SEL_DS32_CPL3;
seg_ds32_cpl3.dpl = 3;
fill_segment_descriptor(gdt, ldt, &seg_ds32_cpl3);
struct kvm_segment seg_cs64 = seg_cs16;
seg_cs64.selector = SEL_CS64;
seg_cs64.l = 1;
fill_segment_descriptor(gdt, ldt, &seg_cs64);
struct kvm_segment seg_ds64 = seg_ds32;
seg_ds64.selector = SEL_DS64;
fill_segment_descriptor(gdt, ldt, &seg_ds64);
struct kvm_segment seg_cs64_cpl3 = seg_cs64;
seg_cs64_cpl3.selector = SEL_CS64_CPL3;
seg_cs64_cpl3.dpl = 3;
fill_segment_descriptor(gdt, ldt, &seg_cs64_cpl3);
struct kvm_segment seg_ds64_cpl3 = seg_ds64;
seg_ds64_cpl3.selector = SEL_DS64_CPL3;
seg_ds64_cpl3.dpl = 3;
fill_segment_descriptor(gdt, ldt, &seg_ds64_cpl3);
struct kvm_segment seg_tss32;
seg_tss32.selector = SEL_TSS32;
seg_tss32.type = 9;
seg_tss32.base = ADDR_VAR_TSS32;
seg_tss32.limit = 0x1ff;
seg_tss32.present = 1;
seg_tss32.dpl = 0;
seg_tss32.s = 0;
seg_tss32.g = 0;
seg_tss32.db = 0;
seg_tss32.l = 0;
fill_segment_descriptor(gdt, ldt, &seg_tss32);
struct kvm_segment seg_tss32_2 = seg_tss32;
seg_tss32_2.selector = SEL_TSS32_2;
seg_tss32_2.base = ADDR_VAR_TSS32_2;
fill_segment_descriptor(gdt, ldt, &seg_tss32_2);
struct kvm_segment seg_tss32_cpl3 = seg_tss32;
seg_tss32_cpl3.selector = SEL_TSS32_CPL3;
seg_tss32_cpl3.base = ADDR_VAR_TSS32_CPL3;
fill_segment_descriptor(gdt, ldt, &seg_tss32_cpl3);
struct kvm_segment seg_tss32_vm86 = seg_tss32;
seg_tss32_vm86.selector = SEL_TSS32_VM86;
seg_tss32_vm86.base = ADDR_VAR_TSS32_VM86;
fill_segment_descriptor(gdt, ldt, &seg_tss32_vm86);
struct kvm_segment seg_tss16 = seg_tss32;
seg_tss16.selector = SEL_TSS16;
seg_tss16.base = ADDR_VAR_TSS16;
seg_tss16.limit = 0xff;
seg_tss16.type = 1;
fill_segment_descriptor(gdt, ldt, &seg_tss16);
struct kvm_segment seg_tss16_2 = seg_tss16;
seg_tss16_2.selector = SEL_TSS16_2;
seg_tss16_2.base = ADDR_VAR_TSS16_2;
seg_tss16_2.dpl = 0;
fill_segment_descriptor(gdt, ldt, &seg_tss16_2);
struct kvm_segment seg_tss16_cpl3 = seg_tss16;
seg_tss16_cpl3.selector = SEL_TSS16_CPL3;
seg_tss16_cpl3.base = ADDR_VAR_TSS16_CPL3;
seg_tss16_cpl3.dpl = 3;
fill_segment_descriptor(gdt, ldt, &seg_tss16_cpl3);
struct kvm_segment seg_tss64 = seg_tss32;
seg_tss64.selector = SEL_TSS64;
seg_tss64.base = ADDR_VAR_TSS64;
seg_tss64.limit = 0x1ff;
fill_segment_descriptor_dword(gdt, ldt, &seg_tss64);
struct kvm_segment seg_tss64_cpl3 = seg_tss64;
seg_tss64_cpl3.selector = SEL_TSS64_CPL3;
seg_tss64_cpl3.base = ADDR_VAR_TSS64_CPL3;
seg_tss64_cpl3.dpl = 3;
fill_segment_descriptor_dword(gdt, ldt, &seg_tss64_cpl3);
struct kvm_segment seg_cgate16;
seg_cgate16.selector = SEL_CGATE16;
seg_cgate16.type = 4;
seg_cgate16.base = SEL_CS16 | (2 << 16);
seg_cgate16.limit = ADDR_VAR_USER_CODE2;
seg_cgate16.present = 1;
seg_cgate16.dpl = 0;
seg_cgate16.s = 0;
seg_cgate16.g = 0;
seg_cgate16.db = 0;
seg_cgate16.l = 0;
seg_cgate16.avl = 0;
fill_segment_descriptor(gdt, ldt, &seg_cgate16);
struct kvm_segment seg_tgate16 = seg_cgate16;
seg_tgate16.selector = SEL_TGATE16;
seg_tgate16.type = 3;
seg_cgate16.base = SEL_TSS16_2;
seg_tgate16.limit = 0;
fill_segment_descriptor(gdt, ldt, &seg_tgate16);
struct kvm_segment seg_cgate32 = seg_cgate16;
seg_cgate32.selector = SEL_CGATE32;
seg_cgate32.type = 12;
seg_cgate32.base = SEL_CS32 | (2 << 16);
fill_segment_descriptor(gdt, ldt, &seg_cgate32);
struct kvm_segment seg_tgate32 = seg_cgate32;
seg_tgate32.selector = SEL_TGATE32;
seg_tgate32.type = 11;
seg_tgate32.base = SEL_TSS32_2;
seg_tgate32.limit = 0;
fill_segment_descriptor(gdt, ldt, &seg_tgate32);
struct kvm_segment seg_cgate64 = seg_cgate16;
seg_cgate64.selector = SEL_CGATE64;
seg_cgate64.type = 12;
seg_cgate64.base = SEL_CS64;
fill_segment_descriptor_dword(gdt, ldt, &seg_cgate64);
int kvmfd = open("/dev/kvm", O_RDWR);
char buf[sizeof(struct kvm_cpuid2) + 128 * sizeof(struct kvm_cpuid_entry2)];
memset(buf, 0, sizeof(buf));
struct kvm_cpuid2* cpuid = (struct kvm_cpuid2*)buf;
cpuid->nent = 128;
ioctl(kvmfd, KVM_GET_SUPPORTED_CPUID, cpuid);
ioctl(cpufd, KVM_SET_CPUID2, cpuid);
close(kvmfd);
const char* text_prefix;
int text_prefix_size = 0;
char* host_text = host_mem + ADDR_TEXT;
if (text_type == 8) {
if (flags & KVM_SETUP_SMM) {
if (flags & KVM_SETUP_PROTECTED) {
sregs.cs = seg_cs16;
sregs.ds = sregs.es = sregs.fs = sregs.gs = sregs.ss = seg_ds16;
sregs.cr0 |= CR0_PE;
} else {
sregs.cs.selector = 0;
sregs.cs.base = 0;
}
NONFAILING(*(host_mem + ADDR_TEXT) = 0xf4);
host_text = host_mem + 0x8000;
ioctl(cpufd, KVM_SMI, 0);
} else if (flags & KVM_SETUP_VIRT86) {
sregs.cs = seg_cs32;
sregs.ds = sregs.es = sregs.fs = sregs.gs = sregs.ss = seg_ds32;
sregs.cr0 |= CR0_PE;
sregs.efer |= EFER_SCE;
setup_syscall_msrs(cpufd, SEL_CS32, SEL_CS32_CPL3);
setup_32bit_idt(&sregs, host_mem, guest_mem);
if (flags & KVM_SETUP_PAGING) {
uint64_t pd_addr = guest_mem + ADDR_PD;
uint64_t* pd = (uint64_t*)(host_mem + ADDR_PD);
NONFAILING(pd[0] = PDE32_PRESENT | PDE32_RW | PDE32_USER | PDE32_PS);
sregs.cr3 = pd_addr;
sregs.cr4 |= CR4_PSE;
text_prefix = kvm_asm32_paged_vm86;
text_prefix_size = sizeof(kvm_asm32_paged_vm86) - 1;
} else {
text_prefix = kvm_asm32_vm86;
text_prefix_size = sizeof(kvm_asm32_vm86) - 1;
}
} else {
sregs.cs.selector = 0;
sregs.cs.base = 0;
}
} else if (text_type == 16) {
if (flags & KVM_SETUP_CPL3) {
sregs.cs = seg_cs16;
sregs.ds = sregs.es = sregs.fs = sregs.gs = sregs.ss = seg_ds16;
text_prefix = kvm_asm16_cpl3;
text_prefix_size = sizeof(kvm_asm16_cpl3) - 1;
} else {
sregs.cr0 |= CR0_PE;
sregs.cs = seg_cs16;
sregs.ds = sregs.es = sregs.fs = sregs.gs = sregs.ss = seg_ds16;
}
} else if (text_type == 32) {
sregs.cr0 |= CR0_PE;
sregs.efer |= EFER_SCE;
setup_syscall_msrs(cpufd, SEL_CS32, SEL_CS32_CPL3);
setup_32bit_idt(&sregs, host_mem, guest_mem);
if (flags & KVM_SETUP_SMM) {
sregs.cs = seg_cs32;
sregs.ds = sregs.es = sregs.fs = sregs.gs = sregs.ss = seg_ds32;
NONFAILING(*(host_mem + ADDR_TEXT) = 0xf4);
host_text = host_mem + 0x8000;
ioctl(cpufd, KVM_SMI, 0);
} else if (flags & KVM_SETUP_PAGING) {
sregs.cs = seg_cs32;
sregs.ds = sregs.es = sregs.fs = sregs.gs = sregs.ss = seg_ds32;
uint64_t pd_addr = guest_mem + ADDR_PD;
uint64_t* pd = (uint64_t*)(host_mem + ADDR_PD);
NONFAILING(pd[0] = PDE32_PRESENT | PDE32_RW | PDE32_USER | PDE32_PS);
sregs.cr3 = pd_addr;
sregs.cr4 |= CR4_PSE;
text_prefix = kvm_asm32_paged;
text_prefix_size = sizeof(kvm_asm32_paged) - 1;
} else if (flags & KVM_SETUP_CPL3) {
sregs.cs = seg_cs32_cpl3;
sregs.ds = sregs.es = sregs.fs = sregs.gs = sregs.ss = seg_ds32_cpl3;
} else {
sregs.cs = seg_cs32;
sregs.ds = sregs.es = sregs.fs = sregs.gs = sregs.ss = seg_ds32;
}
} else {
sregs.efer |= EFER_LME | EFER_SCE;
sregs.cr0 |= CR0_PE;
setup_syscall_msrs(cpufd, SEL_CS64, SEL_CS64_CPL3);
setup_64bit_idt(&sregs, host_mem, guest_mem);
sregs.cs = seg_cs32;
sregs.ds = sregs.es = sregs.fs = sregs.gs = sregs.ss = seg_ds32;
uint64_t pml4_addr = guest_mem + ADDR_PML4;
uint64_t* pml4 = (uint64_t*)(host_mem + ADDR_PML4);
uint64_t pdpt_addr = guest_mem + ADDR_PDP;
uint64_t* pdpt = (uint64_t*)(host_mem + ADDR_PDP);
uint64_t pd_addr = guest_mem + ADDR_PD;
uint64_t* pd = (uint64_t*)(host_mem + ADDR_PD);
NONFAILING(pml4[0] = PDE64_PRESENT | PDE64_RW | PDE64_USER | pdpt_addr);
NONFAILING(pdpt[0] = PDE64_PRESENT | PDE64_RW | PDE64_USER | pd_addr);
NONFAILING(pd[0] = PDE64_PRESENT | PDE64_RW | PDE64_USER | PDE64_PS);
sregs.cr3 = pml4_addr;
sregs.cr4 |= CR4_PAE;
if (flags & KVM_SETUP_VM) {
sregs.cr0 |= CR0_NE;
NONFAILING(*((uint64_t*)(host_mem + ADDR_VAR_VMXON_PTR)) = ADDR_VAR_VMXON);
NONFAILING(*((uint64_t*)(host_mem + ADDR_VAR_VMCS_PTR)) = ADDR_VAR_VMCS);
NONFAILING(memcpy(host_mem + ADDR_VAR_VMEXIT_CODE, kvm_asm64_vm_exit, sizeof(kvm_asm64_vm_exit) - 1));
NONFAILING(*((uint64_t*)(host_mem + ADDR_VAR_VMEXIT_PTR)) = ADDR_VAR_VMEXIT_CODE);
text_prefix = kvm_asm64_init_vm;
text_prefix_size = sizeof(kvm_asm64_init_vm) - 1;
} else if (flags & KVM_SETUP_CPL3) {
text_prefix = kvm_asm64_cpl3;
text_prefix_size = sizeof(kvm_asm64_cpl3) - 1;
} else {
text_prefix = kvm_asm64_enable_long;
text_prefix_size = sizeof(kvm_asm64_enable_long) - 1;
}
}
NONFAILING(
struct tss16* tss = (struct tss16*)(host_mem + seg_tss16_2.base);
memset(tss, 0, sizeof(*tss));
tss->ss0 = tss->ss1 = tss->ss2 = SEL_DS16;
tss->sp0 = tss->sp1 = tss->sp2 = ADDR_STACK0;
tss->ip = ADDR_VAR_USER_CODE2;
tss->flags = (1 << 1);
tss->cs = SEL_CS16;
tss->es = tss->ds = tss->ss = SEL_DS16;
tss->ldt = SEL_LDT);
NONFAILING(
struct tss16* tss = (struct tss16*)(host_mem + seg_tss16_cpl3.base);
memset(tss, 0, sizeof(*tss));
tss->ss0 = tss->ss1 = tss->ss2 = SEL_DS16;
tss->sp0 = tss->sp1 = tss->sp2 = ADDR_STACK0;
tss->ip = ADDR_VAR_USER_CODE2;
tss->flags = (1 << 1);
tss->cs = SEL_CS16_CPL3;
tss->es = tss->ds = tss->ss = SEL_DS16_CPL3;
tss->ldt = SEL_LDT);
NONFAILING(
struct tss32* tss = (struct tss32*)(host_mem + seg_tss32_vm86.base);
memset(tss, 0, sizeof(*tss));
tss->ss0 = tss->ss1 = tss->ss2 = SEL_DS32;
tss->sp0 = tss->sp1 = tss->sp2 = ADDR_STACK0;
tss->ip = ADDR_VAR_USER_CODE;
tss->flags = (1 << 1) | (1 << 17);
tss->ldt = SEL_LDT;
tss->cr3 = sregs.cr3;
tss->io_bitmap = offsetof(struct tss32, io_bitmap));
NONFAILING(
struct tss32* tss = (struct tss32*)(host_mem + seg_tss32_2.base);
memset(tss, 0, sizeof(*tss));
tss->ss0 = tss->ss1 = tss->ss2 = SEL_DS32;
tss->sp0 = tss->sp1 = tss->sp2 = ADDR_STACK0;
tss->ip = ADDR_VAR_USER_CODE;
tss->flags = (1 << 1);
tss->cr3 = sregs.cr3;
tss->es = tss->ds = tss->ss = tss->gs = tss->fs = SEL_DS32;
tss->cs = SEL_CS32;
tss->ldt = SEL_LDT;
tss->cr3 = sregs.cr3;
tss->io_bitmap = offsetof(struct tss32, io_bitmap));
NONFAILING(
struct tss64* tss = (struct tss64*)(host_mem + seg_tss64.base);
memset(tss, 0, sizeof(*tss));
tss->rsp[0] = ADDR_STACK0;
tss->rsp[1] = ADDR_STACK0;
tss->rsp[2] = ADDR_STACK0;
tss->io_bitmap = offsetof(struct tss64, io_bitmap));
NONFAILING(
struct tss64* tss = (struct tss64*)(host_mem + seg_tss64_cpl3.base);
memset(tss, 0, sizeof(*tss));
tss->rsp[0] = ADDR_STACK0;
tss->rsp[1] = ADDR_STACK0;
tss->rsp[2] = ADDR_STACK0;
tss->io_bitmap = offsetof(struct tss64, io_bitmap));
if (text_size > 1000)
text_size = 1000;
if (text_prefix) {
NONFAILING(memcpy(host_text, text_prefix, text_prefix_size));
void* patch = 0;
NONFAILING(patch = memmem(host_text, text_prefix_size, "\xde\xc0\xad\x0b", 4));
if (patch)
NONFAILING(*((uint32_t*)patch) = guest_mem + ADDR_TEXT + ((char*)patch - host_text) + 6);
uint16_t magic = PREFIX_SIZE;
patch = 0;
NONFAILING(patch = memmem(host_text, text_prefix_size, &magic, sizeof(magic)));
if (patch)
NONFAILING(*((uint16_t*)patch) = guest_mem + ADDR_TEXT + text_prefix_size);
}
NONFAILING(memcpy((void*)(host_text + text_prefix_size), text, text_size));
NONFAILING(*(host_text + text_prefix_size + text_size) = 0xf4);
NONFAILING(memcpy(host_mem + ADDR_VAR_USER_CODE, text, text_size));
NONFAILING(*(host_mem + ADDR_VAR_USER_CODE + text_size) = 0xf4);
NONFAILING(*(host_mem + ADDR_VAR_HLT) = 0xf4);
NONFAILING(memcpy(host_mem + ADDR_VAR_SYSRET, "\x0f\x07\xf4", 3));
NONFAILING(memcpy(host_mem + ADDR_VAR_SYSEXIT, "\x0f\x35\xf4", 3));
if (ioctl(cpufd, KVM_SET_SREGS, &sregs))
return -1;
if (ioctl(cpufd, KVM_SET_REGS, &regs))
return -1;
return 0;
}
#elif defined(__aarch64__)
struct kvm_text {
uintptr_t typ;
const void* text;
uintptr_t size;
};
struct kvm_opt {
uint64_t typ;
uint64_t val;
};
static uintptr_t syz_kvm_setup_cpu(uintptr_t a0, uintptr_t a1, uintptr_t a2, uintptr_t a3, uintptr_t a4, uintptr_t a5, uintptr_t a6, uintptr_t a7)
{
const int vmfd = a0;
const int cpufd = a1;
char* const host_mem = (char*)a2;
const struct kvm_text* const text_array_ptr = (struct kvm_text*)a3;
const uintptr_t text_count = a4;
const uintptr_t flags = a5;
const struct kvm_opt* const opt_array_ptr = (struct kvm_opt*)a6;
uintptr_t opt_count = a7;
(void)flags;
(void)opt_count;
const uintptr_t page_size = 4 << 10;
const uintptr_t guest_mem = 0;
const uintptr_t guest_mem_size = 24 * page_size;
(void)text_count;
int text_type = 0;
const void* text = 0;
int text_size = 0;
NONFAILING(text_type = text_array_ptr[0].typ);
NONFAILING(text = text_array_ptr[0].text);
NONFAILING(text_size = text_array_ptr[0].size);
(void)text_type;
(void)opt_array_ptr;
uint32_t features = 0;
if (opt_count > 1)
opt_count = 1;
uintptr_t i;
for (i = 0; i < opt_count; i++) {
uint64_t typ = 0;
uint64_t val = 0;
NONFAILING(typ = opt_array_ptr[i].typ);
NONFAILING(val = opt_array_ptr[i].val);
switch (typ) {
case 1:
features = val;
break;
}
}
for (i = 0; i < guest_mem_size / page_size; i++) {
struct kvm_userspace_memory_region memreg;
memreg.slot = i;
memreg.flags = 0;
memreg.guest_phys_addr = guest_mem + i * page_size;
memreg.memory_size = page_size;
memreg.userspace_addr = (uintptr_t)host_mem + i * page_size;
ioctl(vmfd, KVM_SET_USER_MEMORY_REGION, &memreg);
}
struct kvm_vcpu_init init;
ioctl(cpufd, KVM_ARM_PREFERRED_TARGET, &init);
init.features[0] = features;
ioctl(cpufd, KVM_ARM_VCPU_INIT, &init);
if (text_size > 1000)
text_size = 1000;
NONFAILING(memcpy(host_mem, text, text_size));
return 0;
}
#endif
#endif
static uintptr_t execute_syscall(int nr, uintptr_t a0, uintptr_t a1, uintptr_t a2, uintptr_t a3, uintptr_t a4, uintptr_t a5, uintptr_t a6, uintptr_t a7, uintptr_t a8)
{
switch (nr) {
default:
return syscall(nr, a0, a1, a2, a3, a4, a5);
#ifdef __NR_syz_test
case __NR_syz_test:
return 0;
#endif
#ifdef __NR_syz_open_dev
case __NR_syz_open_dev:
return syz_open_dev(a0, a1, a2);
#endif
#ifdef __NR_syz_open_pts
case __NR_syz_open_pts:
return syz_open_pts(a0, a1);
#endif
#ifdef __NR_syz_fuse_mount
case __NR_syz_fuse_mount:
return syz_fuse_mount(a0, a1, a2, a3, a4, a5);
#endif
#ifdef __NR_syz_fuseblk_mount
case __NR_syz_fuseblk_mount:
return syz_fuseblk_mount(a0, a1, a2, a3, a4, a5, a6, a7);
#endif
#ifdef __NR_syz_emit_ethernet
case __NR_syz_emit_ethernet:
return syz_emit_ethernet(a0, a1);
#endif
#ifdef __NR_syz_kvm_setup_cpu
case __NR_syz_kvm_setup_cpu:
return syz_kvm_setup_cpu(a0, a1, a2, a3, a4, a5, a6, a7);
#endif
}
}
static void setup_main_process(uint64_t pid, bool enable_tun)
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = SIG_IGN;
syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);
install_segv_handler();
#ifdef __NR_syz_emit_ethernet
if (enable_tun)
initialize_tun(pid);
#endif
char tmpdir_template[] = "./syzkaller.XXXXXX";
char* tmpdir = mkdtemp(tmpdir_template);
if (!tmpdir)
fail("failed to mkdtemp");
if (chmod(tmpdir, 0777))
fail("failed to chmod");
if (chdir(tmpdir))
fail("failed to chdir");
}
static void loop();
static void sandbox_common()
{
prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
setpgrp();
setsid();
struct rlimit rlim;
rlim.rlim_cur = rlim.rlim_max = 128 << 20;
setrlimit(RLIMIT_AS, &rlim);
rlim.rlim_cur = rlim.rlim_max = 1 << 20;
setrlimit(RLIMIT_FSIZE, &rlim);
rlim.rlim_cur = rlim.rlim_max = 1 << 20;
setrlimit(RLIMIT_STACK, &rlim);
rlim.rlim_cur = rlim.rlim_max = 0;
setrlimit(RLIMIT_CORE, &rlim);
unshare(CLONE_NEWNS);
unshare(CLONE_NEWIPC);
unshare(CLONE_IO);
}
#if defined(SYZ_EXECUTOR) || defined(SYZ_SANDBOX_NONE)
static int do_sandbox_none()
{
int pid = fork();
if (pid)
return pid;
sandbox_common();
loop();
doexit(1);
}
#endif
#if defined(SYZ_EXECUTOR) || defined(SYZ_SANDBOX_SETUID)
static int do_sandbox_setuid()
{
int pid = fork();
if (pid)
return pid;
sandbox_common();
const int nobody = 65534;
if (setgroups(0, NULL))
fail("failed to setgroups");
if (syscall(SYS_setresgid, nobody, nobody, nobody))
fail("failed to setresgid");
if (syscall(SYS_setresuid, nobody, nobody, nobody))
fail("failed to setresuid");
loop();
doexit(1);
}
#endif
#if defined(SYZ_EXECUTOR) || defined(SYZ_SANDBOX_NAMESPACE)
static int real_uid;
static int real_gid;
__attribute__((aligned(64 << 10))) static char sandbox_stack[1 << 20];
static bool write_file(const char* file, const char* what, ...)
{
char buf[1024];
va_list args;
va_start(args, what);
vsnprintf(buf, sizeof(buf), what, args);
va_end(args);
buf[sizeof(buf) - 1] = 0;
int len = strlen(buf);
int fd = open(file, O_WRONLY | O_CLOEXEC);
if (fd == -1)
return false;
if (write(fd, buf, len) != len) {
close(fd);
return false;
}
close(fd);
return true;
}
static int namespace_sandbox_proc(void* arg)
{
sandbox_common();
write_file("/proc/self/setgroups", "deny");
if (!write_file("/proc/self/uid_map", "0 %d 1\n", real_uid))
fail("write of /proc/self/uid_map failed");
if (!write_file("/proc/self/gid_map", "0 %d 1\n", real_gid))
fail("write of /proc/self/gid_map failed");
if (mkdir("./syz-tmp", 0777))
fail("mkdir(syz-tmp) failed");
if (mount("", "./syz-tmp", "tmpfs", 0, NULL))
fail("mount(tmpfs) failed");
if (mkdir("./syz-tmp/newroot", 0777))
fail("mkdir failed");
if (mkdir("./syz-tmp/newroot/dev", 0700))
fail("mkdir failed");
if (mount("/dev", "./syz-tmp/newroot/dev", NULL, MS_BIND | MS_REC | MS_PRIVATE, NULL))
fail("mount(dev) failed");
if (mkdir("./syz-tmp/pivot", 0777))
fail("mkdir failed");
if (syscall(SYS_pivot_root, "./syz-tmp", "./syz-tmp/pivot")) {
debug("pivot_root failed");
if (chdir("./syz-tmp"))
fail("chdir failed");
} else {
if (chdir("/"))
fail("chdir failed");
if (umount2("./pivot", MNT_DETACH))
fail("umount failed");
}
if (chroot("./newroot"))
fail("chroot failed");
if (chdir("/"))
fail("chdir failed");
struct __user_cap_header_struct cap_hdr = {};
struct __user_cap_data_struct cap_data[2] = {};
cap_hdr.version = _LINUX_CAPABILITY_VERSION_3;
cap_hdr.pid = getpid();
if (syscall(SYS_capget, &cap_hdr, &cap_data))
fail("capget failed");
cap_data[0].effective &= ~(1 << CAP_SYS_PTRACE);
cap_data[0].permitted &= ~(1 << CAP_SYS_PTRACE);
cap_data[0].inheritable &= ~(1 << CAP_SYS_PTRACE);
if (syscall(SYS_capset, &cap_hdr, &cap_data))
fail("capset failed");
loop();
doexit(1);
}
static int do_sandbox_namespace()
{
real_uid = getuid();
real_gid = getgid();
mprotect(sandbox_stack, 4096, PROT_NONE);
return clone(namespace_sandbox_proc, &sandbox_stack[sizeof(sandbox_stack) - 8],
CLONE_NEWUSER | CLONE_NEWPID | CLONE_NEWUTS | CLONE_NEWNET, NULL);
}
#endif
#if defined(SYZ_EXECUTOR) || defined(SYZ_REPEAT)
static void remove_dir(const char* dir)
{
DIR* dp;
struct dirent* ep;
int iter = 0;
retry:
dp = opendir(dir);
if (dp == NULL) {
if (errno == EMFILE) {
exitf("opendir(%s) failed due to NOFILE, exiting");
}
exitf("opendir(%s) failed", dir);
}
while ((ep = readdir(dp))) {
if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
continue;
char filename[FILENAME_MAX];
snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
struct stat st;
if (lstat(filename, &st))
exitf("lstat(%s) failed", filename);
if (S_ISDIR(st.st_mode)) {
remove_dir(filename);
continue;
}
int i;
for (i = 0;; i++) {
debug("unlink(%s)\n", filename);
if (unlink(filename) == 0)
break;
if (errno == EROFS) {
debug("ignoring EROFS\n");
break;
}
if (errno != EBUSY || i > 100)
exitf("unlink(%s) failed", filename);
debug("umount(%s)\n", filename);
if (umount2(filename, MNT_DETACH))
exitf("umount(%s) failed", filename);
}
}
closedir(dp);
int i;
for (i = 0;; i++) {
debug("rmdir(%s)\n", dir);
if (rmdir(dir) == 0)
break;
if (i < 100) {
if (errno == EROFS) {
debug("ignoring EROFS\n");
break;
}
if (errno == EBUSY) {
debug("umount(%s)\n", dir);
if (umount2(dir, MNT_DETACH))
exitf("umount(%s) failed", dir);
continue;
}
if (errno == ENOTEMPTY) {
if (iter < 100) {
iter++;
goto retry;
}
}
}
exitf("rmdir(%s) failed", dir);
}
}
#endif
#if defined(SYZ_EXECUTOR) || defined(SYZ_REPEAT)
static uint64_t current_time_ms()
{
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts))
fail("clock_gettime failed");
return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}
#endif
#if defined(SYZ_REPEAT)
static void test();
void loop()
{
int iter;
for (iter = 0;; iter++) {
char cwdbuf[256];
sprintf(cwdbuf, "./%d", iter);
if (mkdir(cwdbuf, 0777))
fail("failed to mkdir");
int pid = fork();
if (pid < 0)
fail("clone failed");
if (pid == 0) {
prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
setpgrp();
if (chdir(cwdbuf))
fail("failed to chdir");
test();
doexit(0);
}
int status = 0;
uint64_t start = current_time_ms();
for (;;) {
int res = waitpid(-1, &status, __WALL | WNOHANG);
if (res == pid)
break;
usleep(1000);
if (current_time_ms() - start > 5 * 1000) {
kill(-pid, SIGKILL);
kill(pid, SIGKILL);
while (waitpid(-1, &status, __WALL) != pid) {
}
break;
}
}
remove_dir(cwdbuf);
}
}
#endif
`
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