syzkaller-repros/linux/47ec6043e25102603ddbf1b92b58b7181e1f0077.c

// WARNING: kernel stack frame pointer has bad value
// https://syzkaller.appspot.com/bug?id=47ec6043e25102603ddbf1b92b58b7181e1f0077
// status:fixed
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.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 void execute_one();
extern unsigned long long procid;

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

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};
void execute_one()
{
  long res = 0;
  res = syscall(__NR_socket, 0x26, 5, 0);
  if (res != -1)
    r[0] = res;
  *(uint16_t*)0x20000000 = 0x26;
  memcpy((void*)0x20000002,
         "\x68\x61\x73\x68\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 14);
  *(uint32_t*)0x20000010 = 0;
  *(uint32_t*)0x20000014 = 0;
  memcpy((void*)0x20000018,
         "\x73\x68\x61\x33\x2d\x32\x32\x34\x00\x00\x00\x00\x00\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
         64);
  syscall(__NR_bind, r[0], 0x20000000, 0x58);
  *(uint32_t*)0x20000080 = 0;
  res = syscall(__NR_accept4, r[0], 0, 0x20000080, 0);
  if (res != -1)
    r[1] = res;
  *(uint64_t*)0x20000440 = 0x20000200;
  *(uint64_t*)0x20000448 = 0;
  *(uint64_t*)0x20000450 = 0x200002c0;
  *(uint64_t*)0x20000458 = 0;
  *(uint64_t*)0x20000460 = 0x20000300;
  *(uint64_t*)0x20000468 = 0;
  *(uint64_t*)0x20000470 = 0x20000380;
  *(uint64_t*)0x20000478 = 0;
  *(uint64_t*)0x20000480 = 0x20000400;
  memcpy((void*)0x20000400, "\xe8\x79\x55\x67\x24\x40\x80\x57\xf2\x41\xeb\xbe"
                            "\x36\x58\x15\xd3\x6f\xb3\x40\xa5\x51\xd4\xbe\xa4"
                            "\x43\xf2\xb5\xc2\xd5\xe3\x3b\xca\xa6\x20\x65\xdc"
                            "\x0c\x8e\xd9\xe9\xe0\xed\xf7\x1f\x39\x38\xa1\x1c"
                            "\x98\xa1\xb5\xdb\x02",
         53);
  *(uint64_t*)0x20000488 = 0x35;
  syscall(__NR_writev, r[1], 0x20000440, 5);
}

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();
  }
}