pkg/csource: support akaros

1 files changed, 2042 insertions, 0 deletions

diff --git a/pkg/csource/linux_common.go b/pkg/csource/linux_common.go
new file mode 100644
index 000000000..b86424ff9
--- /dev/null
+++ b/pkg/csource/linux_common.go
@@ -0,0 +1,2042 @@
+// AUTOGENERATED FROM executor/common_linux.h
+package csource
+
+var commonHeaderLinux = `
+
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <sys/syscall.h>
+#include <unistd.h>
+#if defined(SYZ_EXECUTOR) || defined(SYZ_THREADED) || defined(SYZ_COLLIDE)
+#include <pthread.h>
+#include <stdlib.h>
+#endif
+#if defined(SYZ_EXECUTOR) || (defined(SYZ_REPEAT) && defined(SYZ_WAIT_REPEAT))
+#include <errno.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+#include <time.h>
+#endif
+#if defined(SYZ_EXECUTOR) || (defined(SYZ_REPEAT) && defined(SYZ_WAIT_REPEAT))
+#include <sys/prctl.h>
+#endif
+#if defined(SYZ_EXECUTOR) || (defined(SYZ_REPEAT) && defined(SYZ_WAIT_REPEAT) && defined(SYZ_USE_TMP_DIR))
+#include <dirent.h>
+#include <sys/mount.h>
+#endif
+#if defined(SYZ_EXECUTOR) || defined(SYZ_SANDBOX_NONE) || defined(SYZ_SANDBOX_SETUID) || defined(SYZ_SANDBOX_NAMESPACE)
+#include <errno.h>
+#include <sched.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <sys/prctl.h>
+#include <sys/resource.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+#endif
+#if defined(SYZ_EXECUTOR) || defined(SYZ_SANDBOX_SETUID)
+#include <grp.h>
+#endif
+#if defined(SYZ_EXECUTOR) || defined(SYZ_SANDBOX_NAMESPACE)
+#include <fcntl.h>
+#include <linux/capability.h>
+#include <sys/mman.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#endif
+#if defined(SYZ_EXECUTOR) || defined(SYZ_TUN_ENABLE)
+#include <arpa/inet.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/if.h>
+#include <linux/if_ether.h>
+#include <linux/if_tun.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <net/if_arp.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/uio.h>
+#endif
+#if defined(SYZ_EXECUTOR) || defined(SYZ_FAULT_INJECTION)
+#include <errno.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#endif
+#if defined(SYZ_EXECUTOR) || defined(__NR_syz_open_dev)
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#endif
+#if defined(SYZ_EXECUTOR) || defined(__NR_syz_fuse_mount) || defined(__NR_syz_fuseblk_mount)
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+#endif
+#if defined(SYZ_EXECUTOR) || defined(__NR_syz_open_pts)
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#endif
+#if defined(SYZ_EXECUTOR) || defined(__NR_syz_kvm_setup_cpu)
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/kvm.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#endif
+
+#if defined(SYZ_EXECUTOR) || (defined(SYZ_REPEAT) && defined(SYZ_WAIT_REPEAT)) ||      \
+    defined(SYZ_USE_TMP_DIR) || defined(SYZ_HANDLE_SEGV) || defined(SYZ_TUN_ENABLE) || \
+    defined(SYZ_SANDBOX_NAMESPACE) || defined(SYZ_SANDBOX_SETUID) ||                   \
+    defined(SYZ_SANDBOX_NONE) || defined(SYZ_FAULT_INJECTION) || defined(__NR_syz_kvm_setup_cpu)
+__attribute__((noreturn)) static void doexit(int status)
+{
+	volatile unsigned i;
+	syscall(__NR_exit_group, status);
+	for (i = 0;; i++) {
+	}
+}
+#define NORETURN __attribute__((noreturn))
+#endif
+
+#if defined(SYZ_EXECUTOR)
+#define exit use_doexit_instead
+#define _exit use_doexit_instead
+#endif
+
+
+
+#include <stdint.h>
+#include <string.h>
+#if defined(SYZ_EXECUTOR) || defined(SYZ_USE_TMP_DIR)
+#include <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#endif
+#if defined(SYZ_EXECUTOR) || defined(SYZ_HANDLE_SEGV)
+#include <setjmp.h>
+#include <signal.h>
+#include <string.h>
+#endif
+#if defined(SYZ_EXECUTOR) || defined(SYZ_DEBUG)
+#include <stdarg.h>
+#include <stdio.h>
+#endif
+
+#if defined(SYZ_EXECUTOR)
+#ifndef SYSCALLAPI
+#define SYSCALLAPI
+#endif
+
+typedef long(SYSCALLAPI* syscall_t)(long, long, long, long, long, long, long, long, long);
+
+struct call_t {
+	const char* name;
+	int sys_nr;
+	syscall_t call;
+};
+
+extern call_t syscalls[];
+extern unsigned syscall_count;
+#endif
+
+#if defined(SYZ_EXECUTOR) || (defined(SYZ_REPEAT) && defined(SYZ_WAIT_REPEAT)) ||            \
+    defined(SYZ_USE_TMP_DIR) || defined(SYZ_TUN_ENABLE) || defined(SYZ_SANDBOX_NAMESPACE) || \
+    defined(SYZ_SANDBOX_SETUID) || defined(SYZ_FAULT_INJECTION) || defined(__NR_syz_kvm_setup_cpu)
+const int kFailStatus = 67;
+const int kRetryStatus = 69;
+#endif
+
+#if defined(SYZ_EXECUTOR)
+const int kErrorStatus = 68;
+#endif
+
+#if defined(SYZ_EXECUTOR) || (defined(SYZ_REPEAT) && defined(SYZ_WAIT_REPEAT)) ||            \
+    defined(SYZ_USE_TMP_DIR) || defined(SYZ_TUN_ENABLE) || defined(SYZ_SANDBOX_NAMESPACE) || \
+    defined(SYZ_SANDBOX_SETUID) || defined(SYZ_FAULT_INJECTION) || defined(__NR_syz_kvm_setup_cpu)
+NORETURN static 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 || e == EAGAIN) ? kRetryStatus : kFailStatus);
+}
+#endif
+
+#if defined(SYZ_EXECUTOR)
+NORETURN static 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
+
+#if defined(SYZ_EXECUTOR) || (defined(SYZ_REPEAT) && defined(SYZ_WAIT_REPEAT))
+NORETURN static 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);
+}
+#endif
+
+#if defined(SYZ_EXECUTOR) || defined(SYZ_DEBUG)
+static int flag_debug;
+
+static void debug(const char* msg, ...)
+{
+	if (!flag_debug)
+		return;
+	va_list args;
+	va_start(args, msg);
+	vfprintf(stderr, msg, args);
+	va_end(args);
+	fflush(stderr);
+}
+#endif
+
+#if defined(SYZ_EXECUTOR) || defined(SYZ_USE_BITMASKS)
+#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;                                         \
+	}
+#endif
+
+#if defined(SYZ_EXECUTOR) || defined(SYZ_USE_CHECKSUMS)
+struct csum_inet {
+	uint32_t acc;
+};
+
+static void csum_inet_init(struct csum_inet* csum)
+{
+	csum->acc = 0;
+}
+
+static void csum_inet_update(struct csum_inet* csum, const uint8_t* data, size_t length)
+{
+	if (length == 0)
+		return;
+
+	size_t i;
+	for (i = 0; i < length - 1; i += 2)
+		csum->acc += *(uint16_t*)&data[i];
+
+	if (length & 1)
+		csum->acc += (uint16_t)data[length - 1];
+
+	while (csum->acc > 0xffff)
+		csum->acc = (csum->acc & 0xffff) + (csum->acc >> 16);
+}
+
+static uint16_t csum_inet_digest(struct csum_inet* csum)
+{
+	return ~csum->acc;
+}
+#endif
+
+#if defined(SYZ_EXECUTOR) || defined(SYZ_HANDLE_SEGV)
+static __thread int skip_segv;
+static __thread jmp_buf segv_env;
+
+static void segv_handler(int sig, siginfo_t* info, void* uctx)
+{
+	uintptr_t addr = (uintptr_t)info->si_addr;
+	const uintptr_t prog_start = 1 << 20;
+	const uintptr_t prog_end = 100 << 20;
+	if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) && (addr < prog_start || addr > prog_end)) {
+		debug("SIGSEGV on %p, skipping\n", addr);
+		_longjmp(segv_env, 1);
+	}
+	debug("SIGSEGV on %p, exiting\n", addr);
+	doexit(sig);
+	for (;;) {
+	}
+}
+
+static void install_segv_handler()
+{
+	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);
+
+	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); \
+	}
+#endif
+
+#if defined(SYZ_EXECUTOR) || (defined(SYZ_REPEAT) && defined(SYZ_WAIT_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_EXECUTOR)
+static void sleep_ms(uint64_t ms)
+{
+	usleep(ms * 1000);
+}
+#endif
+
+#if defined(SYZ_EXECUTOR) || defined(SYZ_USE_TMP_DIR)
+static void use_temporary_dir()
+{
+	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");
+}
+#endif
+
+#if defined(SYZ_EXECUTOR) || defined(SYZ_TUN_ENABLE)
+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
+#define PATH_PREFIX "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin "
+#define PATH_PREFIX_LEN (sizeof(PATH_PREFIX) - 1)
+
+static void execute_command(const char* format, ...)
+{
+	va_list args;
+	char command[PATH_PREFIX_LEN + COMMAND_MAX_LEN];
+	int rv;
+
+	va_start(args, format);
+	memcpy(command, PATH_PREFIX, PATH_PREFIX_LEN);
+	vsnprintf_check(command + PATH_PREFIX_LEN, COMMAND_MAX_LEN, format, args);
+	rv = system(command);
+	if (rv != 0)
+		fail("tun: command \"%s\" failed with code %d", &command[0], rv);
+
+	va_end(args);
+}
+
+static int tunfd = -1;
+static int tun_frags_enabled;
+
+#define SYZ_TUN_MAX_PACKET_SIZE 1000
+
+#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 "172.20.%d.170"
+#define REMOTE_IPV4 "172.20.%d.187"
+
+#define LOCAL_IPV6 "fe80::%02hxaa"
+#define REMOTE_IPV6 "fe80::%02hxbb"
+
+#ifndef IFF_NAPI
+#define IFF_NAPI 0x0010
+#endif
+#ifndef IFF_NAPI_FRAGS
+#define IFF_NAPI_FRAGS 0x0020
+#endif
+
+static void initialize_tun(uint64_t pid)
+{
+	if (pid >= MAX_PIDS)
+		fail("tun: no more than %d executors", MAX_PIDS);
+	int id = pid;
+
+	tunfd = open("/dev/net/tun", O_RDWR | O_NONBLOCK);
+	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 | IFF_NAPI | IFF_NAPI_FRAGS;
+	if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0) {
+		ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
+		if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0)
+			fail("tun: ioctl(TUNSETIFF) failed");
+	}
+	if (ioctl(tunfd, TUNGETIFF, (void*)&ifr) < 0)
+		fail("tun: ioctl(TUNGETIFF) failed");
+	tun_frags_enabled = (ifr.ifr_flags & IFF_NAPI_FRAGS) != 0;
+	debug("tun_frags_enabled=%d\n", tun_frags_enabled);
+
+	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("sysctl -w net.ipv6.conf.%s.accept_dad=0", iface);
+
+	execute_command("sysctl -w net.ipv6.conf.%s.router_solicitations=0", iface);
+
+	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 dev %s up", iface);
+}
+
+static void setup_tun(uint64_t pid, bool enable_tun)
+{
+	if (enable_tun)
+		initialize_tun(pid);
+}
+#endif
+
+#if defined(SYZ_EXECUTOR) || (defined(SYZ_TUN_ENABLE) && (defined(__NR_syz_extract_tcp_res) || defined(SYZ_REPEAT) && defined(SYZ_WAIT_REPEAT)))
+static int read_tun(char* data, int size)
+{
+	int rv = read(tunfd, data, size);
+	if (rv < 0) {
+		if (errno == EAGAIN)
+			return -1;
+		if (errno == EBADFD)
+			return -1;
+		fail("tun: read failed with %d", rv);
+	}
+	return rv;
+}
+#endif
+
+#if defined(SYZ_EXECUTOR) || (defined(SYZ_DEBUG) && defined(SYZ_TUN_ENABLE) && (defined(__NR_syz_emit_ethernet) || defined(__NR_syz_extract_tcp_res)))
+static void debug_dump_data(const char* data, int length)
+{
+	int i;
+	for (i = 0; i < length; i++) {
+		debug("%02hx ", (uint8_t)data[i] & (uint8_t)0xff);
+		if (i % 16 == 15)
+			debug("\n");
+	}
+	if (i % 16 != 0)
+		debug("\n");
+}
+#endif
+
+#if defined(SYZ_EXECUTOR) || (defined(__NR_syz_emit_ethernet) && defined(SYZ_TUN_ENABLE))
+#define MAX_FRAGS 4
+struct vnet_fragmentation {
+	uint32_t full;
+	uint32_t count;
+	uint32_t frags[MAX_FRAGS];
+};
+
+static uintptr_t syz_emit_ethernet(uintptr_t a0, uintptr_t a1, uintptr_t a2)
+{
+	if (tunfd < 0)
+		return (uintptr_t)-1;
+
+	uint32_t length = a0;
+	char* data = (char*)a1;
+	debug_dump_data(data, length);
+
+	struct vnet_fragmentation* frags = (struct vnet_fragmentation*)a2;
+	struct iovec vecs[MAX_FRAGS + 1];
+	uint32_t nfrags = 0;
+	if (!tun_frags_enabled || frags == NULL) {
+		vecs[nfrags].iov_base = data;
+		vecs[nfrags].iov_len = length;
+		nfrags++;
+	} else {
+		bool full = true;
+		uint32_t i, count = 0;
+		NONFAILING(full = frags->full);
+		NONFAILING(count = frags->count);
+		if (count > MAX_FRAGS)
+			count = MAX_FRAGS;
+		for (i = 0; i < count && length != 0; i++) {
+			uint32_t size = 0;
+			NONFAILING(size = frags->frags[i]);
+			if (size > length)
+				size = length;
+			vecs[nfrags].iov_base = data;
+			vecs[nfrags].iov_len = size;
+			nfrags++;
+			data += size;
+			length -= size;
+		}
+		if (length != 0 && (full || nfrags == 0)) {
+			vecs[nfrags].iov_base = data;
+			vecs[nfrags].iov_len = length;
+			nfrags++;
+		}
+	}
+	return writev(tunfd, vecs, nfrags);
+}
+#endif
+
+#if defined(SYZ_EXECUTOR) || (defined(SYZ_REPEAT) && defined(SYZ_WAIT_REPEAT) && defined(SYZ_TUN_ENABLE))
+static void flush_tun()
+{
+	char data[SYZ_TUN_MAX_PACKET_SIZE];
+	while (read_tun(&data[0], sizeof(data)) != -1)
+		;
+}
+#endif
+
+#if defined(SYZ_EXECUTOR) || (defined(__NR_syz_extract_tcp_res) && defined(SYZ_TUN_ENABLE))
+#ifndef __ANDROID__
+struct ipv6hdr {
+	__u8 priority : 4,
+	    version : 4;
+	__u8 flow_lbl[3];
+
+	__be16 payload_len;
+	__u8 nexthdr;
+	__u8 hop_limit;
+
+	struct in6_addr saddr;
+	struct in6_addr daddr;
+};
+#endif
+
+struct tcp_resources {
+	int32_t seq;
+	int32_t ack;
+};
+
+static uintptr_t syz_extract_tcp_res(uintptr_t a0, uintptr_t a1, uintptr_t a2)
+{
+
+	if (tunfd < 0)
+		return (uintptr_t)-1;
+
+	char data[SYZ_TUN_MAX_PACKET_SIZE];
+	int rv = read_tun(&data[0], sizeof(data));
+	if (rv == -1)
+		return (uintptr_t)-1;
+	size_t length = rv;
+	debug_dump_data(data, length);
+
+	struct tcphdr* tcphdr;
+
+	if (length < sizeof(struct ethhdr))
+		return (uintptr_t)-1;
+	struct ethhdr* ethhdr = (struct ethhdr*)&data[0];
+
+	if (ethhdr->h_proto == htons(ETH_P_IP)) {
+		if (length < sizeof(struct ethhdr) + sizeof(struct iphdr))
+			return (uintptr_t)-1;
+		struct iphdr* iphdr = (struct iphdr*)&data[sizeof(struct ethhdr)];
+		if (iphdr->protocol != IPPROTO_TCP)
+			return (uintptr_t)-1;
+		if (length < sizeof(struct ethhdr) + iphdr->ihl * 4 + sizeof(struct tcphdr))
+			return (uintptr_t)-1;
+		tcphdr = (struct tcphdr*)&data[sizeof(struct ethhdr) + iphdr->ihl * 4];
+	} else {
+		if (length < sizeof(struct ethhdr) + sizeof(struct ipv6hdr))
+			return (uintptr_t)-1;
+		struct ipv6hdr* ipv6hdr = (struct ipv6hdr*)&data[sizeof(struct ethhdr)];
+		if (ipv6hdr->nexthdr != IPPROTO_TCP)
+			return (uintptr_t)-1;
+		if (length < sizeof(struct ethhdr) + sizeof(struct ipv6hdr) + sizeof(struct tcphdr))
+			return (uintptr_t)-1;
+		tcphdr = (struct tcphdr*)&data[sizeof(struct ethhdr) + sizeof(struct ipv6hdr)];
+	}
+
+	struct tcp_resources* res = (struct tcp_resources*)a0;
+	NONFAILING(res->seq = htonl((ntohl(tcphdr->seq) + (uint32_t)a1)));
+	NONFAILING(res->ack = htonl((ntohl(tcphdr->ack_seq) + (uint32_t)a2)));
+
+	debug("extracted seq: %08x\n", res->seq);
+	debug("extracted ack: %08x\n", res->ack);
+
+	return 0;
+}
+#endif
+
+#if defined(SYZ_EXECUTOR) || defined(__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
+
+#if defined(SYZ_EXECUTOR) || defined(__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
+
+#if defined(SYZ_EXECUTOR) || defined(__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
+
+#if defined(SYZ_EXECUTOR) || defined(__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
+
+#if defined(SYZ_EXECUTOR) || defined(__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_VMWRITE_FLD 0x5f18
+#define ADDR_VAR_VMWRITE_VAL 0x5f20
+#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;
+	uintptr_t 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;
+
+	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;
+	sregs.ldt = seg_ldt;
+	uint64_t* ldt = (uint64_t*)(host_mem + sregs.ldt.base);
+
+	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;
+
+	struct kvm_segment seg_ds16 = seg_cs16;
+	seg_ds16.selector = SEL_DS16;
+	seg_ds16.type = 3;
+
+	struct kvm_segment seg_cs16_cpl3 = seg_cs16;
+	seg_cs16_cpl3.selector = SEL_CS16_CPL3;
+	seg_cs16_cpl3.dpl = 3;
+
+	struct kvm_segment seg_ds16_cpl3 = seg_ds16;
+	seg_ds16_cpl3.selector = SEL_DS16_CPL3;
+	seg_ds16_cpl3.dpl = 3;
+
+	struct kvm_segment seg_cs32 = seg_cs16;
+	seg_cs32.selector = SEL_CS32;
+	seg_cs32.db = 1;
+
+	struct kvm_segment seg_ds32 = seg_ds16;
+	seg_ds32.selector = SEL_DS32;
+	seg_ds32.db = 1;
+
+	struct kvm_segment seg_cs32_cpl3 = seg_cs32;
+	seg_cs32_cpl3.selector = SEL_CS32_CPL3;
+	seg_cs32_cpl3.dpl = 3;
+
+	struct kvm_segment seg_ds32_cpl3 = seg_ds32;
+	seg_ds32_cpl3.selector = SEL_DS32_CPL3;
+	seg_ds32_cpl3.dpl = 3;
+
+	struct kvm_segment seg_cs64 = seg_cs16;
+	seg_cs64.selector = SEL_CS64;
+	seg_cs64.l = 1;
+
+	struct kvm_segment seg_ds64 = seg_ds32;
+	seg_ds64.selector = SEL_DS64;
+
+	struct kvm_segment seg_cs64_cpl3 = seg_cs64;
+	seg_cs64_cpl3.selector = SEL_CS64_CPL3;
+	seg_cs64_cpl3.dpl = 3;
+
+	struct kvm_segment seg_ds64_cpl3 = seg_ds64;
+	seg_ds64_cpl3.selector = SEL_DS64_CPL3;
+	seg_ds64_cpl3.dpl = 3;
+
+	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;
+
+	struct kvm_segment seg_tss32_2 = seg_tss32;
+	seg_tss32_2.selector = SEL_TSS32_2;
+	seg_tss32_2.base = ADDR_VAR_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;
+
+	struct kvm_segment seg_tss32_vm86 = seg_tss32;
+	seg_tss32_vm86.selector = SEL_TSS32_VM86;
+	seg_tss32_vm86.base = ADDR_VAR_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;
+
+	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;
+
+	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;
+
+	struct kvm_segment seg_tss64 = seg_tss32;
+	seg_tss64.selector = SEL_TSS64;
+	seg_tss64.base = ADDR_VAR_TSS64;
+	seg_tss64.limit = 0x1ff;
+
+	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;
+
+	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;
+
+	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;
+
+	struct kvm_segment seg_cgate32 = seg_cgate16;
+	seg_cgate32.selector = SEL_CGATE32;
+	seg_cgate32.type = 12;
+	seg_cgate32.base = SEL_CS32 | (2 << 16);
+
+	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;
+
+	struct kvm_segment seg_cgate64 = seg_cgate16;
+	seg_cgate64.selector = SEL_CGATE64;
+	seg_cgate64.type = 12;
+	seg_cgate64.base = SEL_CS64;
+
+	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 = 0;
+	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;
+		}
+	}
+
+	struct tss16 tss16;
+	memset(&tss16, 0, sizeof(tss16));
+	tss16.ss0 = tss16.ss1 = tss16.ss2 = SEL_DS16;
+	tss16.sp0 = tss16.sp1 = tss16.sp2 = ADDR_STACK0;
+	tss16.ip = ADDR_VAR_USER_CODE2;
+	tss16.flags = (1 << 1);
+	tss16.cs = SEL_CS16;
+	tss16.es = tss16.ds = tss16.ss = SEL_DS16;
+	tss16.ldt = SEL_LDT;
+	struct tss16* tss16_addr = (struct tss16*)(host_mem + seg_tss16_2.base);
+	NONFAILING(memcpy(tss16_addr, &tss16, sizeof(tss16)));
+
+	memset(&tss16, 0, sizeof(tss16));
+	tss16.ss0 = tss16.ss1 = tss16.ss2 = SEL_DS16;
+	tss16.sp0 = tss16.sp1 = tss16.sp2 = ADDR_STACK0;
+	tss16.ip = ADDR_VAR_USER_CODE2;
+	tss16.flags = (1 << 1);
+	tss16.cs = SEL_CS16_CPL3;
+	tss16.es = tss16.ds = tss16.ss = SEL_DS16_CPL3;
+	tss16.ldt = SEL_LDT;
+	struct tss16* tss16_cpl3_addr = (struct tss16*)(host_mem + seg_tss16_cpl3.base);
+	NONFAILING(memcpy(tss16_cpl3_addr, &tss16, sizeof(tss16)));
+
+	struct tss32 tss32;
+	memset(&tss32, 0, sizeof(tss32));
+	tss32.ss0 = tss32.ss1 = tss32.ss2 = SEL_DS32;
+	tss32.sp0 = tss32.sp1 = tss32.sp2 = ADDR_STACK0;
+	tss32.ip = ADDR_VAR_USER_CODE;
+	tss32.flags = (1 << 1) | (1 << 17);
+	tss32.ldt = SEL_LDT;
+	tss32.cr3 = sregs.cr3;
+	tss32.io_bitmap = offsetof(struct tss32, io_bitmap);
+	struct tss32* tss32_addr = (struct tss32*)(host_mem + seg_tss32_vm86.base);
+	NONFAILING(memcpy(tss32_addr, &tss32, sizeof(tss32)));
+
+	memset(&tss32, 0, sizeof(tss32));
+	tss32.ss0 = tss32.ss1 = tss32.ss2 = SEL_DS32;
+	tss32.sp0 = tss32.sp1 = tss32.sp2 = ADDR_STACK0;
+	tss32.ip = ADDR_VAR_USER_CODE;
+	tss32.flags = (1 << 1);
+	tss32.cr3 = sregs.cr3;
+	tss32.es = tss32.ds = tss32.ss = tss32.gs = tss32.fs = SEL_DS32;
+	tss32.cs = SEL_CS32;
+	tss32.ldt = SEL_LDT;
+	tss32.cr3 = sregs.cr3;
+	tss32.io_bitmap = offsetof(struct tss32, io_bitmap);
+	struct tss32* tss32_cpl3_addr = (struct tss32*)(host_mem + seg_tss32_2.base);
+	NONFAILING(memcpy(tss32_cpl3_addr, &tss32, sizeof(tss32)));
+
+	struct tss64 tss64;
+	memset(&tss64, 0, sizeof(tss64));
+	tss64.rsp[0] = ADDR_STACK0;
+	tss64.rsp[1] = ADDR_STACK0;
+	tss64.rsp[2] = ADDR_STACK0;
+	tss64.io_bitmap = offsetof(struct tss64, io_bitmap);
+	struct tss64* tss64_addr = (struct tss64*)(host_mem + seg_tss64.base);
+	NONFAILING(memcpy(tss64_addr, &tss64, sizeof(tss64)));
+
+	memset(&tss64, 0, sizeof(tss64));
+	tss64.rsp[0] = ADDR_STACK0;
+	tss64.rsp[1] = ADDR_STACK0;
+	tss64.rsp[2] = ADDR_STACK0;
+	tss64.io_bitmap = offsetof(struct tss64, io_bitmap);
+	struct tss64* tss64_cpl3_addr = (struct tss64*)(host_mem + seg_tss64_cpl3.base);
+	NONFAILING(memcpy(tss64_cpl3_addr, &tss64, sizeof(tss64)));
+
+	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));
+
+	NONFAILING(*(uint64_t*)(host_mem + ADDR_VAR_VMWRITE_FLD) = 0);
+	NONFAILING(*(uint64_t*)(host_mem + ADDR_VAR_VMWRITE_VAL) = 0);
+
+	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 % 9) {
+		case 0:
+			sregs.cr0 ^= val & (CR0_MP | CR0_EM | CR0_ET | CR0_NE | CR0_WP | CR0_AM | CR0_NW | CR0_CD);
+			break;
+		case 1:
+			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 2:
+			sregs.efer ^= val & (EFER_SCE | EFER_NXE | EFER_SVME | EFER_LMSLE | EFER_FFXSR | EFER_TCE);
+			break;
+		case 3:
+			val &= ((1 << 8) | (1 << 9) | (1 << 10) | (1 << 12) | (1 << 13) | (1 << 14) |
+				(1 << 15) | (1 << 18) | (1 << 19) | (1 << 20) | (1 << 21));
+			regs.rflags ^= val;
+			NONFAILING(tss16_addr->flags ^= val);
+			NONFAILING(tss16_cpl3_addr->flags ^= val);
+			NONFAILING(tss32_addr->flags ^= val);
+			NONFAILING(tss32_cpl3_addr->flags ^= val);
+			break;
+		case 4:
+			seg_cs16.type = val & 0xf;
+			seg_cs32.type = val & 0xf;
+			seg_cs64.type = val & 0xf;
+			break;
+		case 5:
+			seg_cs16_cpl3.type = val & 0xf;
+			seg_cs32_cpl3.type = val & 0xf;
+			seg_cs64_cpl3.type = val & 0xf;
+			break;
+		case 6:
+			seg_ds16.type = val & 0xf;
+			seg_ds32.type = val & 0xf;
+			seg_ds64.type = val & 0xf;
+			break;
+		case 7:
+			seg_ds16_cpl3.type = val & 0xf;
+			seg_ds32_cpl3.type = val & 0xf;
+			seg_ds64_cpl3.type = val & 0xf;
+			break;
+		case 8:
+			NONFAILING(*(uint64_t*)(host_mem + ADDR_VAR_VMWRITE_FLD) = (val & 0xffff));
+			NONFAILING(*(uint64_t*)(host_mem + ADDR_VAR_VMWRITE_VAL) = (val >> 16));
+			break;
+		default:
+			fail("bad kvm setup opt");
+		}
+	}
+	regs.rflags |= 2;
+
+	fill_segment_descriptor(gdt, ldt, &seg_ldt);
+	fill_segment_descriptor(gdt, ldt, &seg_cs16);
+	fill_segment_descriptor(gdt, ldt, &seg_ds16);
+	fill_segment_descriptor(gdt, ldt, &seg_cs16_cpl3);
+	fill_segment_descriptor(gdt, ldt, &seg_ds16_cpl3);
+	fill_segment_descriptor(gdt, ldt, &seg_cs32);
+	fill_segment_descriptor(gdt, ldt, &seg_ds32);
+	fill_segment_descriptor(gdt, ldt, &seg_cs32_cpl3);
+	fill_segment_descriptor(gdt, ldt, &seg_ds32_cpl3);
+	fill_segment_descriptor(gdt, ldt, &seg_cs64);
+	fill_segment_descriptor(gdt, ldt, &seg_ds64);
+	fill_segment_descriptor(gdt, ldt, &seg_cs64_cpl3);
+	fill_segment_descriptor(gdt, ldt, &seg_ds64_cpl3);
+	fill_segment_descriptor(gdt, ldt, &seg_tss32);
+	fill_segment_descriptor(gdt, ldt, &seg_tss32_2);
+	fill_segment_descriptor(gdt, ldt, &seg_tss32_cpl3);
+	fill_segment_descriptor(gdt, ldt, &seg_tss32_vm86);
+	fill_segment_descriptor(gdt, ldt, &seg_tss16);
+	fill_segment_descriptor(gdt, ldt, &seg_tss16_2);
+	fill_segment_descriptor(gdt, ldt, &seg_tss16_cpl3);
+	fill_segment_descriptor_dword(gdt, ldt, &seg_tss64);
+	fill_segment_descriptor_dword(gdt, ldt, &seg_tss64_cpl3);
+	fill_segment_descriptor(gdt, ldt, &seg_cgate16);
+	fill_segment_descriptor(gdt, ldt, &seg_tgate16);
+	fill_segment_descriptor(gdt, ldt, &seg_cgate32);
+	fill_segment_descriptor(gdt, ldt, &seg_tgate32);
+	fill_segment_descriptor_dword(gdt, ldt, &seg_cgate64);
+
+	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;
+}
+#else
+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)
+{
+	return 0;
+}
+#endif
+#endif
+
+#if defined(SYZ_EXECUTOR)
+static uintptr_t syz_test()
+{
+	return 0;
+}
+#endif
+
+#if defined(SYZ_EXECUTOR) || defined(SYZ_SANDBOX_NONE) || defined(SYZ_SANDBOX_SETUID) || defined(SYZ_SANDBOX_NAMESPACE)
+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 = 8 << 20;
+	setrlimit(RLIMIT_MEMLOCK, &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);
+}
+#endif
+
+#if defined(SYZ_EXECUTOR) || defined(SYZ_SANDBOX_NONE)
+static int do_sandbox_none(int executor_pid, bool enable_tun)
+{
+	int pid = fork();
+	if (pid)
+		return pid;
+
+	sandbox_common();
+#if defined(SYZ_EXECUTOR) || defined(SYZ_TUN_ENABLE)
+	setup_tun(executor_pid, enable_tun);
+#endif
+
+	loop();
+	doexit(1);
+}
+#endif
+
+#if defined(SYZ_EXECUTOR) || defined(SYZ_SANDBOX_SETUID)
+static int do_sandbox_setuid(int executor_pid, bool enable_tun)
+{
+	int pid = fork();
+	if (pid)
+		return pid;
+
+	sandbox_common();
+#if defined(SYZ_EXECUTOR) || defined(SYZ_TUN_ENABLE)
+	setup_tun(executor_pid, enable_tun);
+#endif
+
+	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");
+
+	prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
+
+	loop();
+	doexit(1);
+}
+#endif
+
+#if defined(SYZ_EXECUTOR) || defined(SYZ_SANDBOX_NAMESPACE) || defined(SYZ_FAULT_INJECTION)
+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;
+}
+#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 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/newroot/proc", 0700))
+		fail("mkdir failed");
+	if (mount(NULL, "./syz-tmp/newroot/proc", "proc", 0, NULL))
+		fail("mount(proc) 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(int executor_pid, bool enable_tun)
+{
+#if defined(SYZ_EXECUTOR) || defined(SYZ_TUN_ENABLE)
+	setup_tun(executor_pid, enable_tun);
+#endif
+
+	real_uid = getuid();
+	real_gid = getgid();
+	mprotect(sandbox_stack, 4096, PROT_NONE);
+	return clone(namespace_sandbox_proc, &sandbox_stack[sizeof(sandbox_stack) - 64],
+		     CLONE_NEWUSER | CLONE_NEWPID | CLONE_NEWUTS | CLONE_NEWNET, NULL);
+}
+#endif
+
+#if defined(SYZ_EXECUTOR) || (defined(SYZ_REPEAT) && defined(SYZ_WAIT_REPEAT) && defined(SYZ_USE_TMP_DIR))
+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_FAULT_INJECTION)
+static int inject_fault(int nth)
+{
+	int fd;
+	char buf[128];
+
+	sprintf(buf, "/proc/self/task/%d/fail-nth", (int)syscall(SYS_gettid));
+	fd = open(buf, O_RDWR);
+	if (fd == -1)
+		fail("failed to open /proc/self/task/tid/fail-nth");
+	sprintf(buf, "%d", nth + 1);
+	if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
+		fail("failed to write /proc/self/task/tid/fail-nth");
+	return fd;
+}
+#endif
+
+#if defined(SYZ_EXECUTOR)
+static int fault_injected(int fail_fd)
+{
+	char buf[16];
+	int n = read(fail_fd, buf, sizeof(buf) - 1);
+	if (n <= 0)
+		fail("failed to read /proc/self/task/tid/fail-nth");
+	int res = n == 2 && buf[0] == '0' && buf[1] == '\n';
+	buf[0] = '0';
+	if (write(fail_fd, buf, 1) != 1)
+		fail("failed to write /proc/self/task/tid/fail-nth");
+	close(fail_fd);
+	return res;
+}
+#endif
+
+#if defined(SYZ_REPEAT)
+static void test();
+
+#if defined(SYZ_WAIT_REPEAT)
+void loop()
+{
+	int iter;
+	for (iter = 0;; iter++) {
+#ifdef SYZ_USE_TMP_DIR
+		char cwdbuf[256];
+		sprintf(cwdbuf, "./%d", iter);
+		if (mkdir(cwdbuf, 0777))
+			fail("failed to mkdir");
+#endif
+		int pid = fork();
+		if (pid < 0)
+			fail("clone failed");
+		if (pid == 0) {
+			prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
+			setpgrp();
+#ifdef SYZ_USE_TMP_DIR
+			if (chdir(cwdbuf))
+				fail("failed to chdir");
+#endif
+#ifdef SYZ_TUN_ENABLE
+			flush_tun();
+#endif
+			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;
+			}
+		}
+#ifdef SYZ_USE_TMP_DIR
+		remove_dir(cwdbuf);
+#endif
+	}
+}
+#else
+void loop()
+{
+	while (1) {
+		test();
+	}
+}
+#endif
+#endif
+`