syzkaller-repros/linux/26e23e560b6a7a40da9abf2626587349afe2f762.c

// KMSAN: uninit-value in ip_vs_lblc_check_expire
// https://syzkaller.appspot.com/bug?id=26e23e560b6a7a40da9abf2626587349afe2f762
// status:fixed
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <errno.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>

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

static void fail(const char* msg, ...)
{
  int e = errno;
  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);
}

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");
}

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;
    strncpy(buf, (char*)a0, sizeof(buf) - 1);
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

static void execute_one();
extern unsigned long long procid;

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

uint64_t r[1] = {0xffffffffffffffff};
void execute_one()
{
  long res = 0;
  res = syscall(__NR_socket, 0xa, 1, 0);
  if (res != -1)
    r[0] = res;
  *(uint16_t*)0x20000080 = 0x11;
  *(uint8_t*)0x20000084 = 0xac;
  *(uint8_t*)0x20000085 = 0x14;
  *(uint8_t*)0x20000086 = 0x14;
  *(uint8_t*)0x20000087 = 0;
  *(uint16_t*)0x20000088 = htobe16(0);
  *(uint32_t*)0x2000008c = 0;
  memcpy((void*)0x20000090,
         "\x6c\x62\x6c\x63\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
         16);
  *(uint32_t*)0x200000a0 = 0;
  *(uint32_t*)0x200000a4 = 0;
  *(uint32_t*)0x200000a8 = htobe32(0);
  syscall(__NR_setsockopt, r[0], 0, 0x482, 0x20000080, 0x2c);
  memcpy((void*)0x20000040, "/dev/input/event#", 18);
  syz_open_dev(0x20000040, 0x7ff, 0x101800);
  *(uint16_t*)0x208a8000 = 0xa;
  *(uint16_t*)0x208a8002 = htobe16(0x4e23);
  *(uint32_t*)0x208a8004 = 0;
  *(uint8_t*)0x208a8008 = 0;
  *(uint8_t*)0x208a8009 = 0;
  *(uint8_t*)0x208a800a = 0;
  *(uint8_t*)0x208a800b = 0;
  *(uint8_t*)0x208a800c = 0;
  *(uint8_t*)0x208a800d = 0;
  *(uint8_t*)0x208a800e = 0;
  *(uint8_t*)0x208a800f = 0;
  *(uint8_t*)0x208a8010 = 0;
  *(uint8_t*)0x208a8011 = 0;
  *(uint8_t*)0x208a8012 = 0;
  *(uint8_t*)0x208a8013 = 0;
  *(uint8_t*)0x208a8014 = 0;
  *(uint8_t*)0x208a8015 = 0;
  *(uint8_t*)0x208a8016 = 0;
  *(uint8_t*)0x208a8017 = 0;
  *(uint32_t*)0x208a8018 = 0;
  syscall(__NR_bind, -1, 0x208a8000, 0x1c);
  memcpy((void*)0x20000140, "/dev/urandom", 13);
  syscall(__NR_openat, 0xffffffffffffff9c, 0x20000140, 0x80800, 0);
  syscall(__NR_socket, 0x11, 0x100000803, 0);
  *(uint32_t*)0x20000080 = 0x3ff;
  syscall(__NR_setsockopt, -1, 0x84, 0x20, 0x20000080, 4);
  *(uint32_t*)0x20000440 = 0xc;
  syscall(__NR_getsockopt, -1, 1, 0x14, 0x20caaffb, 0x20000440);
  syscall(__NR_socket, 0xa, 1, 0);
  memcpy((void*)0x20000040, "/dev/full", 10);
  syscall(__NR_openat, 0xffffffffffffff9c, 0x20000040, 0x10800, 0);
  syscall(__NR_ftruncate, -1, 9);
  syscall(__NR_socket, 0x11, 0x803, 0);
  *(uint32_t*)0x20000040 = 0;
  *(uint16_t*)0x20000044 = -1;
  *(uint32_t*)0x20000080 = 8;
  syscall(__NR_getsockopt, -1, 0x84, 0x18, 0x20000040, 0x20000080);
  syscall(__NR_dup3, 0xffffff9c, -1, 0x80000);
  *(uint8_t*)0x20000200 = 1;
  *(uint8_t*)0x20000201 = 0;
  *(uint8_t*)0x20000202 = 0;
  *(uint8_t*)0x20000203 = 0;
  *(uint8_t*)0x20000204 = 0;
  *(uint8_t*)0x20000205 = 0;
  *(uint8_t*)0x20000206 = 0;
  *(uint8_t*)0x20000207 = 0;
  *(uint8_t*)0x20000208 = 0;
  *(uint8_t*)0x20000209 = 0;
  *(uint8_t*)0x2000020a = 0;
  syscall(__NR_setsockopt, -1, 0x84, 0xb, 0x20000200, 0xb);
  syscall(__NR_socket, 0x10, 3, 0);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  char* cwd = get_current_dir_name();
  for (;;) {
    if (chdir(cwd))
      fail("failed to chdir");
    use_temporary_dir();
    loop();
  }
}