syzkaller-repros/linux/3fb9c4777053e79a6d2a65ac3738664c87629a21.c

// KASAN: use-after-free Read in uprobe_perf_close
// https://syzkaller.appspot.com/bug?id=3fb9c4777053e79a6d2a65ac3738664c87629a21
// status:open
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <linux/futex.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.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);
}

#define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1)

#define BITMASK_LEN_OFF(type, bf_off, bf_len)                                  \
  (type)(BITMASK_LEN(type, (bf_len)) << (bf_off))

#define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len)                      \
  if ((bf_off) == 0 && (bf_len) == 0) {                                        \
    *(type*)(addr) = (type)(val);                                              \
  } else {                                                                     \
    type new_val = *(type*)(addr);                                             \
    new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len));                     \
    new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off);          \
    *(type*)(addr) = new_val;                                                  \
  }

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  setsid();

  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = 128 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 8 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 32 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 0;
  setrlimit(RLIMIT_CORE, &rlim);

  if (unshare(CLONE_NEWNS)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid < 0)
    fail("sandbox fork failed");
  if (pid)
    return pid;

  sandbox_common();
  if (unshare(CLONE_NEWNET)) {
  }

  loop();
  doexit(1);
}

struct thread_t {
  int created, running, call;
  pthread_t th;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;
static int collide;

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE))
      syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE);
    syscall(SYS_futex, &th->running, FUTEX_WAKE);
  }
  return 0;
}

static void execute(int num_calls)
{
  int call, thread;
  running = 0;
  for (call = 0; call < num_calls; call++) {
    for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        pthread_attr_t attr;
        pthread_attr_init(&attr);
        pthread_attr_setstacksize(&attr, 128 << 10);
        pthread_create(&th->th, &attr, thr, th);
      }
      if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) {
        th->call = call;
        __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
        __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE);
        syscall(SYS_futex, &th->running, FUTEX_WAKE);
        if (collide && call % 2)
          break;
        struct timespec ts;
        ts.tv_sec = 0;
        ts.tv_nsec = 20 * 1000 * 1000;
        syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts);
        if (running)
          usleep((call == num_calls - 1) ? 10000 : 1000);
        break;
      }
    }
  }
}

void execute_call(int call)
{
  switch (call) {
  case 0:
    *(uint32_t*)0x2025c000 = 6;
    *(uint32_t*)0x2025c004 = 0x70;
    *(uint8_t*)0x2025c008 = 0xe2;
    *(uint8_t*)0x2025c009 = 0;
    *(uint8_t*)0x2025c00a = 0;
    *(uint8_t*)0x2025c00b = 0;
    *(uint32_t*)0x2025c00c = 0;
    *(uint64_t*)0x2025c010 = 0;
    *(uint64_t*)0x2025c018 = 0;
    *(uint64_t*)0x2025c020 = 0;
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 0, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 1, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 2, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 3, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 4, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 1, 5, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 6, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 7, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 8, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 9, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 8, 10, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 11, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 12, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 13, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 14, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 15, 2);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 17, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 18, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 19, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 20, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 21, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0xffffffffffffffc1, 22, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 23, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 24, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 25, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 26, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0xd7, 27, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 28, 1);
    STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 29, 35);
    *(uint32_t*)0x2025c030 = 0;
    *(uint32_t*)0x2025c034 = 0;
    *(uint64_t*)0x2025c038 = 0x20000000;
    *(uint64_t*)0x2025c040 = 0;
    *(uint64_t*)0x2025c048 = 0;
    *(uint64_t*)0x2025c050 = 0;
    *(uint32_t*)0x2025c058 = 0;
    *(uint32_t*)0x2025c05c = 2;
    *(uint64_t*)0x2025c060 = 0;
    *(uint32_t*)0x2025c068 = 0;
    *(uint16_t*)0x2025c06c = 0;
    *(uint16_t*)0x2025c06e = 0;
    syscall(__NR_perf_event_open, 0x2025c000, 0, 0, -1, 0);
    break;
  case 1:
    memcpy((void*)0x20000000, "./file0", 8);
    syscall(__NR_creat, 0x20000000, 0);
    break;
  }
}

void loop()
{
  execute(2);
  collide = 1;
  execute(2);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  int pid = do_sandbox_none();
  int status = 0;
  while (waitpid(pid, &status, __WALL) != pid) {
  }
  return 0;
}