syzkaller-repros/linux/a7fc2861aa440591f8e570dc2532821b67ba7e60.c

// KMSAN: uninit-value in update_stack_state
// https://syzkaller.appspot.com/bug?id=a7fc2861aa440591f8e570dc2532821b67ba7e60
// status:invalid
// autogenerated by syzkaller (http://github.com/google/syzkaller)

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

uint64_t r[1] = {0xffffffffffffffff};
void loop()
{
  long res = 0;
  memcpy((void*)0x200e0000, "stack", 6);
  res = syz_open_procfs(0, 0x200e0000);
  if (res != -1)
    r[0] = res;
  *(uint64_t*)0x2066dff0 = 0x208ad000;
  *(uint64_t*)0x2066dff8 = 0xb2;
  syscall(__NR_readv, r[0], 0x2066dff0, 1);
}

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