syzkaller-repros/linux/2eb39f9063a72cd5eed7331fd431b561f4e2fb1b.c

// KASAN: global-out-of-bounds Read in show_timer
// https://syzkaller.appspot.com/bug?id=2eb39f9063a72cd5eed7331fd431b561f4e2fb1b
// status:dup
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

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

#include <stdint.h>
#include <string.h>

static uintptr_t syz_open_procfs(uintptr_t a0, uintptr_t a1)
{

  char buf[128];
  memset(buf, 0, sizeof(buf));
  if (a0 == 0) {
    snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1);
  } else if (a0 == (uintptr_t)-1) {
    snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1);
  } else {
    snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0,
             (char*)a1);
  }
  int fd = open(buf, O_RDWR);
  if (fd == -1)
    fd = open(buf, O_RDONLY);
  return fd;
}

long r[19];
void loop()
{
  memset(r, -1, sizeof(r));
  r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul,
                 0xfffffffffffffffful, 0x0ul);
  *(uint64_t*)0x203bb000 = (uint64_t)0x0;
  *(uint32_t*)0x203bb008 = (uint32_t)0x3b;
  *(uint32_t*)0x203bb00c = (uint32_t)0x3;
  *(uint32_t*)0x203bb010 = (uint32_t)0x0;
  *(uint64_t*)0x203bb020 = (uint64_t)0x0;
  *(uint64_t*)0x203bb028 = (uint64_t)0x0;
  *(uint64_t*)0x203bb030 = (uint64_t)0x0;
  *(uint64_t*)0x203bb038 = (uint64_t)0x0;
  *(uint64_t*)0x203bb040 = (uint64_t)0x0;
  *(uint64_t*)0x203bb048 = (uint64_t)0x0;
  *(uint64_t*)0x203bb050 = (uint64_t)0x0;
  *(uint64_t*)0x203bb058 = (uint64_t)0x0;
  r[13] = syscall(__NR_timer_create, 0x1ul, 0x203bb000ul, 0x2024f000ul);
  memcpy((void*)0x20337ff2, "\x74\x69\x6d\x65\x72\x73\x00", 7);
  r[15] = syz_open_procfs(0x0ul, 0x20337ff2ul);
  *(uint64_t*)0x205e2ff0 = (uint64_t)0x20fa6000;
  *(uint64_t*)0x205e2ff8 = (uint64_t)0x64;
  r[18] = syscall(__NR_preadv, r[15], 0x205e2ff0ul, 0x1ul, 0x0ul);
}

int main()
{
  loop();
  return 0;
}