syzkaller-repros/linux/c362601f055ed0d3b7878f3880f4c96c29e82af1.c

// KASAN: slab-out-of-bounds Read in tls_push_record
// https://syzkaller.appspot.com/bug?id=c362601f055ed0d3b7878f3880f4c96c29e82af1
// status:open
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

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 int inject_fault(int nth)
{
  int fd;
  fd = open("/proc/thread-self/fail-nth", O_RDWR);
  if (fd == -1)
    exit(1);
  char buf[16];
  sprintf(buf, "%d", nth + 1);
  if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
    exit(1);
  return fd;
}

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

int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  long res = 0;
  res = syscall(__NR_socket, 0xa, 1, 0);
  if (res != -1)
    r[0] = res;
  res = syscall(__NR_socket, 0xa, 1, 0);
  if (res != -1)
    r[1] = res;
  *(uint16_t*)0x20000040 = 0xa;
  *(uint16_t*)0x20000042 = htobe16(0x4e22);
  *(uint32_t*)0x20000044 = htobe32(0);
  memcpy((void*)0x20000048,
         "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000",
         16);
  *(uint32_t*)0x20000058 = 0;
  syscall(__NR_bind, r[1], 0x20000040, 0x1c);
  syscall(__NR_listen, r[1], 0);
  *(uint16_t*)0x20000080 = 0xa;
  *(uint16_t*)0x20000082 = htobe16(0x4e22);
  *(uint32_t*)0x20000084 = htobe32(0);
  *(uint64_t*)0x20000088 = htobe64(0);
  *(uint64_t*)0x20000090 = htobe64(1);
  *(uint32_t*)0x20000098 = 0;
  syscall(__NR_sendto, r[0], 0, 0, 0x20000004, 0x20000080, 0x1c);
  memcpy((void*)0x20000080, "tls\000", 4);
  syscall(__NR_setsockopt, r[0], 6, 0x1f, 0x20000080, 0x152);
  *(uint16_t*)0x20000100 = 0x303;
  *(uint16_t*)0x20000102 = 0x33;
  syscall(__NR_setsockopt, r[0], 0x11a, 1, 0x20000100, 0x28);
  syscall(__NR_mmap, 0x200be000, 0x3000, 0, 0x100132, -1, 0);
  write_file("/sys/kernel/debug/failslab/ignore-gfp-wait", "N");
  write_file("/sys/kernel/debug/fail_futex/ignore-private", "N");
  write_file("/sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem", "N");
  write_file("/sys/kernel/debug/fail_page_alloc/ignore-gfp-wait", "N");
  write_file("/sys/kernel/debug/fail_page_alloc/min-order", "0");
  inject_fault(0);
  syscall(__NR_sendto, r[0], 0x200005c0, 0xe0ffffff, 0, 0, 0xd8);
  return 0;
}