syzkaller-repros/linux/03da9219e708545ae027f3c90976384fac65af4a.c

// BUG: unable to handle kernel NULL pointer dereference in radix_tree_lookup_slot
// https://syzkaller.appspot.com/bug?id=03da9219e708545ae027f3c90976384fac65af4a
// status:invalid
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/prctl.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.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 <string.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 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;
}

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

static void loop()
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      fail("clone failed");
    if (pid == 0) {
      prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
      setpgrp();
      execute_one();
      int fd;
      for (fd = 3; fd < 30; fd++)
        close(fd);
      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)
        continue;
      kill(-pid, SIGKILL);
      kill(pid, SIGKILL);
      while (waitpid(-1, &status, __WALL) != pid) {
      }
      break;
    }
  }
}

#ifndef __NR_bpf
#define __NR_bpf 321
#endif
#ifndef __NR_seccomp
#define __NR_seccomp 317
#endif

void execute_one()
{
  *(uint32_t*)0x204f9fe4 = 5;
  *(uint32_t*)0x204f9fe8 = 0xa;
  *(uint32_t*)0x204f9fec = 6;
  *(uint32_t*)0x204f9ff0 = 0x1ff;
  *(uint32_t*)0x204f9ff4 = 0;
  *(uint32_t*)0x204f9ff8 = -1;
  *(uint32_t*)0x204f9ffc = 0;
  *(uint8_t*)0x204fa000 = 0;
  *(uint8_t*)0x204fa001 = 0;
  *(uint8_t*)0x204fa002 = 0;
  *(uint8_t*)0x204fa003 = 0;
  *(uint8_t*)0x204fa004 = 0;
  *(uint8_t*)0x204fa005 = 0;
  *(uint8_t*)0x204fa006 = 0;
  *(uint8_t*)0x204fa007 = 0;
  *(uint8_t*)0x204fa008 = 0;
  *(uint8_t*)0x204fa009 = 0;
  *(uint8_t*)0x204fa00a = 0;
  *(uint8_t*)0x204fa00b = 0;
  *(uint8_t*)0x204fa00c = 0;
  *(uint8_t*)0x204fa00d = 0;
  *(uint8_t*)0x204fa00e = 0;
  *(uint8_t*)0x204fa00f = 0;
  syscall(__NR_bpf, 0, 0x204f9fe4, 0x2c);
  *(uint16_t*)0x20000080 = 2;
  *(uint64_t*)0x20000088 = 0x20000040;
  *(uint16_t*)0x20000040 = 0x401;
  *(uint8_t*)0x20000042 = 1;
  *(uint8_t*)0x20000043 = 8;
  *(uint32_t*)0x20000044 = 0xbbe6;
  *(uint16_t*)0x20000048 = 0x200;
  *(uint8_t*)0x2000004a = 6;
  *(uint8_t*)0x2000004b = 1;
  *(uint32_t*)0x2000004c = 3;
  syscall(__NR_seccomp, 0, 1, 0x20000080);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  for (;;) {
    loop();
  }
}