Re: net/ipv6: GPF in rt6_ifdown

From: Andrey Konovalov
Date: Wed Jun 21 2017 - 09:09:21 EST

On Wed, Jun 21, 2017 at 2:08 PM, Andrey Konovalov <andreyknvl@xxxxxxxxxx> wrote:
> Hi,
>
> I've got the following error report while fuzzing the kernel with syzkaller.
>
> On commit 9705596d08ac87c18aee32cc97f2783b7d14624e (4.12-rc6+).
>
> It might be related to:
> https://groups.google.com/forum/#!topic/syzkaller/ZJaqAiFLe3k
>
> I only have a reproducer in the form of a syzkaller program, attached
> together with my .config.

I now have a C reproducer as well, attached.

>
> It can be executed as described here:
> https://github.com/google/syzkaller/blob/master/docs/executing_syzkaller_programs.md
>
> With the following flags:
> ./syz-execprog -repeat=0 -procs=8 -sandbox=namespace ./log
>
> Since I'm able to reproduce it, I can apply debug patches and test
> with them if required.
>
> kasan: CONFIG_KASAN_INLINE enabled
> kasan: GPF could be caused by NULL-ptr deref or user memory access
> general protection fault: 0000 [#1] SMP KASAN
> Modules linked in:
> CPU: 1 PID: 4499 Comm: syz-executor Not tainted 4.12.0-rc6+ #10
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> task: ffff880068e88000 task.stack: ffff88005e0a0000
> RIP: 0010:rt6_uncached_list_flush_dev net/ipv6/route.c:167
> RIP: 0010:rt6_ifdown+0x3d4/0x910 net/ipv6/route.c:2824
> RSP: 0018:ffff88005e0a6e38 EFLAGS: 00010246
> RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc900029a2000
> RDX: 0000000000002dce RSI: ffffffff83ea9ee8 RDI: ffff88006ca25444
> RBP: ffff88005e0a6f98 R08: 0000000000000001 R09: c9811a8e00000000
> R10: ffff880068e88810 R11: dffffc0000000000 R12: ffff88005e0ad518
> R13: ffff88005e0ad500 R14: ffff88006200b300 R15: dffffc0000000000
> FS: 00007f4ccaad9700(0000) GS:ffff88006cb00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000000002000f000 CR3: 00000000672e8000 CR4: 00000000000006e0
> Call Trace:
> addrconf_ifdown+0x1a8/0x1a30 net/ipv6/addrconf.c:3588
> addrconf_notify+0x1cf/0x2630 net/ipv6/addrconf.c:3512
> notifier_call_chain+0x14a/0x2e0 kernel/notifier.c:93
> __raw_notifier_call_chain kernel/notifier.c:394
> raw_notifier_call_chain+0x32/0x40 kernel/notifier.c:401
> call_netdevice_notifiers_info+0x56/0x90 net/core/dev.c:1650
> call_netdevice_notifiers net/core/dev.c:1666
> __dev_notify_flags+0x202/0x330 net/core/dev.c:6647
> dev_change_flags+0xfa/0x150 net/core/dev.c:6678
> dev_ifsioc+0x62f/0x9f0 net/core/dev_ioctl.c:254
> dev_ioctl+0x24e/0x1160 net/core/dev_ioctl.c:532
> sock_do_ioctl+0x99/0xb0 net/socket.c:913
> sock_ioctl+0x294/0x440 net/socket.c:1004
> vfs_ioctl fs/ioctl.c:45
> do_vfs_ioctl+0x1c4/0x1660 fs/ioctl.c:685
> SYSC_ioctl fs/ioctl.c:700
> SyS_ioctl+0x94/0xc0 fs/ioctl.c:691
> entry_SYSCALL_64_fastpath+0x1f/0xbe arch/x86/entry/entry_64.S:203
> RIP: 0033:0x446349
> RSP: 002b:00007f4ccaad8c08 EFLAGS: 00000282 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 0000000000003210 RCX: 0000000000446349
> RDX: 00000000208befe0 RSI: 0000000000008914 RDI: 0000000000000018
> RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000282 R12: 0000000000000018
> R13: 0000000000003210 R14: 00000000006e42d0 R15: 0000000000008914
> Code: 49 8b 9d 58 01 00 00 4c 89 e0 48 c1 e8 03 42 80 3c 38 00 0f 85
> 6d 04 00 00 49 8b 45 18 48 89 85 f0 fe ff ff 48 89 d8 48 c1 e8 03 <42>
> 80 3c 38 00 0f 85 5d 04 00 00 4c 3b 33 0f 84 d7 01 00 00 e8
> RIP: rt6_ifdown+0x3d4/0x910 RSP: ffff88005e0a6e38
> ---[ end trace f2e889448df70bb4 ]---
> Kernel panic - not syncing: Fatal exception in interrupt
> Kernel Offset: disabled
> ---[ end Kernel panic - not syncing: Fatal exception in interrupt
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#ifndef __NR_socket
#define __NR_socket 41
#endif
#ifndef __NR_ioctl
#define __NR_ioctl 16
#endif
#ifndef __NR_syz_emit_ethernet
#define __NR_syz_emit_ethernet 1000006
#endif
#ifndef __NR_connect
#define __NR_connect 42
#endif
#ifndef __NR_sendmmsg
#define __NR_sendmmsg 307
#endif
#ifndef __NR_mmap
#define __NR_mmap 9
#endif

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/capability.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 <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <unistd.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

__attribute__((noreturn)) static void doexit(int status)
{
volatile unsigned i;
syscall(__NR_exit_group, status);
for (i = 0;; i++) {
}
}

__attribute__((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);
}

#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; \
}

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];
int rv;

va_start(args, format);

vsnprintf_check(command, sizeof(command), 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;

#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"

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;
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("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);
}

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;
}

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);
}

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);
}

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 real_uid;
static int real_gid;
static int epid;
static bool etun;
__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");

setup_tun(epid, etun);

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")) {
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)
{
real_uid = getuid();
real_gid = getgid();
epid = executor_pid;
etun = enable_tun;
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);
}

static void test();

void loop()
{
while (1) {
test();
}
}

long r[128];
void test()
{
memset(r, -1, sizeof(r));
r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul,
0xfffffffffffffffful, 0x0ul);
r[1] = syscall(__NR_socket, 0xaul, 0x6ul, 0x0ul);
memcpy((void*)0x208befe0,
"\x73\x69\x74\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00",
16);
*(uint16_t*)0x208beff0 = (uint16_t)0x2;
*(uint16_t*)0x208beff2 = (uint16_t)0x204e;
*(uint8_t*)0x208beff4 = (uint8_t)0xac;
*(uint8_t*)0x208beff5 = (uint8_t)0x14;
*(uint8_t*)0x208beff6 = (uint8_t)0x0;
*(uint8_t*)0x208beff7 = (uint8_t)0xaa;
*(uint8_t*)0x208beff8 = (uint8_t)0x0;
*(uint8_t*)0x208beff9 = (uint8_t)0x0;
*(uint8_t*)0x208beffa = (uint8_t)0x0;
*(uint8_t*)0x208beffb = (uint8_t)0x0;
*(uint8_t*)0x208beffc = (uint8_t)0x0;
*(uint8_t*)0x208beffd = (uint8_t)0x0;
*(uint8_t*)0x208beffe = (uint8_t)0x0;
*(uint8_t*)0x208befff = (uint8_t)0x0;
r[17] = syscall(__NR_ioctl, r[1], 0x8914ul, 0x208befe0ul);
*(uint8_t*)0x2000f000 = (uint8_t)0xbb;
*(uint8_t*)0x2000f001 = (uint8_t)0xbb;
*(uint8_t*)0x2000f002 = (uint8_t)0xbb;
*(uint8_t*)0x2000f003 = (uint8_t)0xbb;
*(uint8_t*)0x2000f004 = (uint8_t)0xbb;
*(uint8_t*)0x2000f005 = (uint8_t)0x0;
*(uint8_t*)0x2000f006 = (uint8_t)0x0;
*(uint8_t*)0x2000f007 = (uint8_t)0x0;
*(uint8_t*)0x2000f008 = (uint8_t)0x0;
*(uint8_t*)0x2000f009 = (uint8_t)0x0;
*(uint8_t*)0x2000f00a = (uint8_t)0x0;
*(uint8_t*)0x2000f00b = (uint8_t)0x0;
*(uint16_t*)0x2000f00c = (uint16_t)0xf588;
STORE_BY_BITMASK(uint8_t, 0x2000f00e, 0xa, 0, 4);
STORE_BY_BITMASK(uint8_t, 0x2000f00e, 0x4, 4, 4);
STORE_BY_BITMASK(uint8_t, 0x2000f00f, 0x401, 0, 2);
STORE_BY_BITMASK(uint8_t, 0x2000f00f, 0x8, 2, 6);
*(uint16_t*)0x2000f010 = (uint16_t)0x3000;
*(uint16_t*)0x2000f012 = (uint16_t)0x1fc;
*(uint16_t*)0x2000f014 = (uint16_t)0x4;
*(uint8_t*)0x2000f016 = (uint8_t)0x400;
*(uint8_t*)0x2000f017 = (uint8_t)0x29;
*(uint16_t*)0x2000f018 = (uint16_t)0x0;
*(uint32_t*)0x2000f01a = (uint32_t)0x20000e0;
*(uint32_t*)0x2000f01e = (uint32_t)0x10000e0;
*(uint8_t*)0x2000f022 = (uint8_t)0x83;
*(uint8_t*)0x2000f023 = (uint8_t)0x13;
*(uint8_t*)0x2000f024 = (uint8_t)0x2;
*(uint32_t*)0x2000f025 = (uint32_t)0x10000e0;
*(uint32_t*)0x2000f029 = (uint32_t)0x100007f;
*(uint32_t*)0x2000f02d = (uint32_t)0x1000080;
*(uint32_t*)0x2000f031 = (uint32_t)0x20000e0;
*(uint8_t*)0x2000f036 = (uint8_t)0x22;
*(uint8_t*)0x2000f037 = (uint8_t)0xff;
*(uint16_t*)0x2000f038 = (uint16_t)0x0;
*(uint32_t*)0x2000f03a = (uint32_t)0x100007f;
struct csum_inet csum_54;
csum_inet_init(&csum_54);
csum_inet_update(&csum_54, (const uint8_t*)0x2000f036, 8);
*(uint16_t*)0x2000f038 = csum_inet_digest(&csum_54);
struct csum_inet csum_55;
csum_inet_init(&csum_55);
csum_inet_update(&csum_55, (const uint8_t*)0x2000f00e, 40);
*(uint16_t*)0x2000f018 = csum_inet_digest(&csum_55);
r[56] = syz_emit_ethernet(0x3eul, 0x2000f000ul);
r[57] = syscall(__NR_socket, 0x2ul, 0x806ul, 0x0ul);
memcpy((void*)0x20dc4000,
"\x6c\x6f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00",
16);
*(uint64_t*)0x20dc4010 = (uint64_t)0x4;
*(uint64_t*)0x20dc4018 = (uint64_t)0xffffffffffffffff;
*(uint16_t*)0x20dc4020 = (uint16_t)0x2;
*(uint8_t*)0x20dc4022 = (uint8_t)0x40;
*(uint8_t*)0x20dc4023 = (uint8_t)0x2ed5;
*(uint8_t*)0x20dc4024 = (uint8_t)0x8;
r[65] = syscall(__NR_ioctl, r[57], 0x8922ul, 0x20dc4000ul);
r[66] = syscall(__NR_socket, 0xaul, 0x3ul, 0x6ul);
memcpy((void*)0x20334000,
"\x73\x69\x74\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00",
16);
*(uint16_t*)0x20334010 = (uint16_t)0x1;
r[69] = syscall(__NR_ioctl, r[66], 0x8914ul, 0x20334000ul);
r[70] =
syscall(__NR_socket, 0xaul, 0x8000000080803ul, 0x200000000fful);
*(uint16_t*)0x20ffcfe4 = (uint16_t)0xa;
*(uint16_t*)0x20ffcfe6 = (uint16_t)0x204e;
*(uint32_t*)0x20ffcfe8 = (uint32_t)0xfffffffffffffffd;
*(uint64_t*)0x20ffcfec = (uint64_t)0x0;
*(uint64_t*)0x20ffcff4 = (uint64_t)0x100000000000000;
*(uint32_t*)0x20ffcffc = (uint32_t)0xfffffffffffffffd;
r[77] = syscall(__NR_connect, r[70], 0x20ffcfe4ul, 0x1cul);
*(uint64_t*)0x20fe2f40 = (uint64_t)0x0;
*(uint32_t*)0x20fe2f48 = (uint32_t)0x0;
*(uint64_t*)0x20fe2f50 = (uint64_t)0x20736f70;
*(uint64_t*)0x20fe2f58 = (uint64_t)0x3;
*(uint64_t*)0x20fe2f60 = (uint64_t)0x20ff3000;
*(uint64_t*)0x20fe2f68 = (uint64_t)0x0;
*(uint32_t*)0x20fe2f70 = (uint32_t)0x1;
*(uint32_t*)0x20fe2f78 = (uint32_t)0x0;
*(uint64_t*)0x20fe2f80 = (uint64_t)0x20f7efff;
*(uint32_t*)0x20fe2f88 = (uint32_t)0x0;
*(uint64_t*)0x20fe2f90 = (uint64_t)0x20642000;
*(uint64_t*)0x20fe2f98 = (uint64_t)0x2;
*(uint64_t*)0x20fe2fa0 = (uint64_t)0x20acee40;
*(uint64_t*)0x20fe2fa8 = (uint64_t)0x4;
*(uint32_t*)0x20fe2fb0 = (uint32_t)0x400f;
*(uint32_t*)0x20fe2fb8 = (uint32_t)0x5;
*(uint64_t*)0x20fe2fc0 = (uint64_t)0x0;
*(uint32_t*)0x20fe2fc8 = (uint32_t)0x0;
*(uint64_t*)0x20fe2fd0 = (uint64_t)0x20ff4797;
*(uint64_t*)0x20fe2fd8 = (uint64_t)0x0;
*(uint64_t*)0x20fe2fe0 = (uint64_t)0x20f51000;
*(uint64_t*)0x20fe2fe8 = (uint64_t)0x1;
*(uint32_t*)0x20fe2ff0 = (uint32_t)0x20008000;
*(uint32_t*)0x20fe2ff8 = (uint32_t)0x2;
*(uint64_t*)0x20736f70 = (uint64_t)0x20a4ff16;
*(uint64_t*)0x20736f78 = (uint64_t)0x0;
*(uint64_t*)0x20736f80 = (uint64_t)0x20869fff;
*(uint64_t*)0x20736f88 = (uint64_t)0x0;
*(uint64_t*)0x20736f90 = (uint64_t)0x20b69000;
*(uint64_t*)0x20736f98 = (uint64_t)0x0;
*(uint64_t*)0x20642000 = (uint64_t)0x20aa4000;
*(uint64_t*)0x20642008 = (uint64_t)0x0;
*(uint64_t*)0x20642010 = (uint64_t)0x20ff3000;
*(uint64_t*)0x20642018 = (uint64_t)0x0;
*(uint64_t*)0x20acee40 = (uint64_t)0x10;
*(uint32_t*)0x20acee48 = (uint32_t)0x88;
*(uint32_t*)0x20acee4c = (uint32_t)0x800000006;
*(uint64_t*)0x20acee50 = (uint64_t)0x10;
*(uint32_t*)0x20acee58 = (uint32_t)0x108;
*(uint32_t*)0x20acee5c = (uint32_t)0x9;
*(uint64_t*)0x20acee60 = (uint64_t)0x10;
*(uint32_t*)0x20acee68 = (uint32_t)0x11f;
*(uint32_t*)0x20acee6c = (uint32_t)0x6;
*(uint64_t*)0x20acee70 = (uint64_t)0x10;
*(uint32_t*)0x20acee78 = (uint32_t)0x10f;
*(uint32_t*)0x20acee7c = (uint32_t)0x10001;
*(uint64_t*)0x20f51000 = (uint64_t)0x10;
*(uint32_t*)0x20f51008 = (uint32_t)0x1;
*(uint32_t*)0x20f5100c = (uint32_t)0x7;
r[127] = syscall(__NR_sendmmsg, r[70], 0x20fe2f40ul, 0x3ul, 0xc0ul);
}

int main()
{
int pid = do_sandbox_namespace(0, true);
int status = 0;
while (waitpid(pid, &status, __WALL) != pid) {
}
return 0;
}