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Bug #371 » reproducer1.c

Sven Eckelmann, 12/31/2018 07:56 PM

 
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.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/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/if_tun.h>
#include <linux/ip.h>
#include <linux/tcp.h>

unsigned long long procid;

static void sleep_ms(uint64_t ms)
{
usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts))
exit(1);
return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

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)
exit(1);
if ((size_t)rv >= size)
exit(1);
}

#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(bool panic, 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);
va_end(args);
rv = system(command);
if (rv) {
if (panic)
exit(1);
}
}

#define DEV_IPV4 "172.20.20.%d"
#define DEV_IPV6 "fe80::%02hx"
#define DEV_MAC "aa:aa:aa:aa:aa:%02hx"

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);
}
static void initialize_netdevices(void)
{
char netdevsim[16];
sprintf(netdevsim, "netdevsim%d", (int)procid);
const char* devtypes[] = {"ip6gretap", "ip6erspan", "bridge", "vcan",
"bond", "team", "dummy", "nlmon",
"caif", "batadv"};
const char* devmasters[] = {"bridge", "bond", "team"};
const char* devnames[] = {"lo",
"sit0",
"bridge0",
"vcan0",
"tunl0",
"gre0",
"gretap0",
"ip_vti0",
"ip6_vti0",
"ip6tnl0",
"ip6gre0",
"ip6gretap0",
"erspan0",
"bond0",
"veth0",
"veth1",
"team0",
"veth0_to_bridge",
"veth1_to_bridge",
"veth0_to_bond",
"veth1_to_bond",
"veth0_to_team",
"veth1_to_team",
"veth0_to_hsr",
"veth1_to_hsr",
"hsr0",
"ip6erspan0",
"dummy0",
"nlmon0",
"vxcan1",
"caif0",
"batadv0",
netdevsim};
unsigned i;
for (i = 0; i < sizeof(devtypes) / (sizeof(devtypes[0])); i++)
execute_command(0, "ip link add dev %s0 type %s", devtypes[i], devtypes[i]);
execute_command(0, "ip link add dev vxcan1 type vxcan");
execute_command(0, "ip link add dev %s type netdevsim", netdevsim);
execute_command(0, "ip link add type veth");
for (i = 0; i < sizeof(devmasters) / (sizeof(devmasters[0])); i++) {
execute_command(
0, "ip link add name %s_slave_0 type veth peer name veth0_to_%s",
devmasters[i], devmasters[i]);
execute_command(
0, "ip link add name %s_slave_1 type veth peer name veth1_to_%s",
devmasters[i], devmasters[i]);
execute_command(0, "ip link set %s_slave_0 master %s0", devmasters[i],
devmasters[i]);
execute_command(0, "ip link set %s_slave_1 master %s0", devmasters[i],
devmasters[i]);
}
execute_command(0, "ip link set bridge_slave_0 up");
execute_command(0, "ip link set bridge_slave_1 up");
execute_command(
0, "ip link add name hsr_slave_0 type veth peer name veth0_to_hsr");
execute_command(
0, "ip link add name hsr_slave_1 type veth peer name veth1_to_hsr");
execute_command(
0, "ip link add dev hsr0 type hsr slave1 hsr_slave_0 slave2 hsr_slave_1");
execute_command(0, "ip link set hsr_slave_0 up");
execute_command(0, "ip link set hsr_slave_1 up");
for (i = 0; i < sizeof(devnames) / (sizeof(devnames[0])); i++) {
char addr[32];
snprintf_check(addr, sizeof(addr), DEV_IPV4, i + 10);
execute_command(0, "ip -4 addr add %s/24 dev %s", addr, devnames[i]);
snprintf_check(addr, sizeof(addr), DEV_IPV6, i + 10);
execute_command(0, "ip -6 addr add %s/120 dev %s", addr, devnames[i]);
snprintf_check(addr, sizeof(addr), DEV_MAC, i + 10);
execute_command(0, "ip link set dev %s address %s", devnames[i], addr);
execute_command(0, "ip link set dev %s up", devnames[i]);
}
}
static void initialize_netdevices_init(void)
{
int pid = procid;
execute_command(0, "ip link set dev nr%d address bb:bb:bb:bb:bb:00:%02hx",
pid, pid);
execute_command(0, "ip -4 addr add 172.30.00.%d/24 dev nr%d", pid + 1, pid);
execute_command(0, "ip -6 addr add fe88::00:%02hx/120 dev nr%d", pid + 1,
pid);
execute_command(0, "ip link set dev nr%d up", pid);
execute_command(0, "ip link set dev rose%d address bb:bb:bb:01:%02hx", pid,
pid);
execute_command(0, "ip -4 addr add 172.30.01.%d/24 dev rose%d", pid + 1, pid);
execute_command(0, "ip -6 addr add fe88::01:%02hx/120 dev rose%d", pid + 1,
pid);
}

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) {
int err = errno;
close(fd);
errno = err;
return false;
}
close(fd);
return true;
}

static void setup_common()
{
if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) {
}
}

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 = 200 << 20;
setrlimit(RLIMIT_AS, &rlim);
rlim.rlim_cur = rlim.rlim_max = 32 << 20;
setrlimit(RLIMIT_MEMLOCK, &rlim);
rlim.rlim_cur = rlim.rlim_max = 136 << 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);
rlim.rlim_cur = rlim.rlim_max = 256;
setrlimit(RLIMIT_NOFILE, &rlim);
if (unshare(CLONE_NEWNS)) {
}
if (unshare(CLONE_NEWIPC)) {
}
if (unshare(0x02000000)) {
}
if (unshare(CLONE_NEWUTS)) {
}
if (unshare(CLONE_SYSVSEM)) {
}
typedef struct {
const char* name;
const char* value;
} sysctl_t;
static const sysctl_t sysctls[] = {
{"/proc/sys/kernel/shmmax", "16777216"},
{"/proc/sys/kernel/shmall", "536870912"},
{"/proc/sys/kernel/shmmni", "1024"},
{"/proc/sys/kernel/msgmax", "8192"},
{"/proc/sys/kernel/msgmni", "1024"},
{"/proc/sys/kernel/msgmnb", "1024"},
{"/proc/sys/kernel/sem", "1024 1048576 500 1024"},
};
unsigned i;
for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++) {
if (!write_file(sysctls[i].name, sysctls[i].value)) {
}
}
}

int wait_for_loop(int pid)
{
if (pid < 0)
exit(1);
int status = 0;
while (waitpid(-1, &status, __WALL) != pid) {
}
return WEXITSTATUS(status);
}

static int do_sandbox_none(void)
{
if (unshare(CLONE_NEWPID)) {
}
int pid = fork();
if (pid != 0)
return wait_for_loop(pid);
setup_common();
sandbox_common();
initialize_netdevices_init();
if (unshare(CLONE_NEWNET)) {
}
initialize_netdevices();
loop();
exit(1);
}

static void kill_and_wait(int pid, int* status)
{
kill(-pid, SIGKILL);
kill(pid, SIGKILL);
int i;
for (i = 0; i < 100; i++) {
if (waitpid(-1, status, WNOHANG | __WALL) == pid)
return;
usleep(1000);
}
DIR* dir = opendir("/sys/fs/fuse/connections");
if (dir) {
for (;;) {
struct dirent* ent = readdir(dir);
if (!ent)
break;
if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
continue;
char abort[300];
snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
ent->d_name);
int fd = open(abort, O_WRONLY);
if (fd == -1) {
continue;
}
if (write(fd, abort, 1) < 0) {
}
close(fd);
}
closedir(dir);
} else {
}
while (waitpid(-1, status, __WALL) != pid) {
}
}

#define SYZ_HAVE_SETUP_TEST 1
static void setup_test()
{
prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
setpgrp();
}

#define SYZ_HAVE_RESET_TEST 1
static void reset_test()
{
int fd;
for (fd = 3; fd < 30; fd++)
close(fd);
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
int iter;
for (iter = 0;; iter++) {
int pid = fork();
if (pid < 0)
exit(1);
if (pid == 0) {
setup_test();
execute_one();
reset_test();
exit(0);
}
int status = 0;
uint64_t start = current_time_ms();
for (;;) {
if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
break;
sleep_ms(1);
if (current_time_ms() - start < 5 * 1000)
continue;
kill_and_wait(pid, &status);
break;
}
}
}

uint64_t r[2] = {0xffffffffffffffff, 0x0};

void execute_one(void)
{
long res = 0;
res = syscall(__NR_socket, 0x11, 0x100000000000003, 0x300);
if (res != -1)
r[0] = res;
memcpy((void*)0x20000200, "batadv0\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16);
*(uint32_t*)0x20000210 = 0;
res = syscall(__NR_ioctl, r[0], 0x8933, 0x20000200);
if (res != -1)
r[1] = *(uint32_t*)0x20000210;
*(uint32_t*)0x20000100 = 4;
syscall(__NR_setsockopt, r[0], 0x107, 0x14, 0x20000100, 4);
*(uint16_t*)0x20000040 = 0x11;
*(uint16_t*)0x20000042 = htobe16(0);
*(uint32_t*)0x20000044 = r[1];
*(uint16_t*)0x20000048 = 1;
*(uint8_t*)0x2000004a = 0;
*(uint8_t*)0x2000004b = 6;
memcpy((void*)0x2000004c, "\x32\xca\xe4\x78\x3d\x32", 6);
*(uint8_t*)0x20000052 = 0;
*(uint8_t*)0x20000053 = 0;
syscall(__NR_bind, r[0], 0x20000040, 0x14);
memcpy((void*)0x20000180,
"\x05\x03\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00\xc5\x2c", 14);
syscall(__NR_sendto, r[0], 0x20000180, 0xe, 0, 0, 0);
}
int main(void)
{
syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
do_sandbox_none();
return 0;
}
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