xref: /freebsd/tools/test/stress2/misc/syzkaller85.sh (revision 257a750c60f14f83dff7bf5d2189089b1e74870b)

#!/bin/sh

# panic: Assertion uio->uio_resid < 0 failed at ../../../netlink/netlink_domain.c:808
# cpuid = 8
# time = 1759044376
# KDB: stack backtrace:
# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0184d17a70
# vpanic() at vpanic+0x136/frame 0xfffffe0184d17ba0
# panic() at panic+0x43/frame 0xfffffe0184d17c00
# nl_soreceive() at nl_soreceive+0x433/frame 0xfffffe0184d17ca0
# soreceive() at soreceive+0x45/frame 0xfffffe0184d17cc0
# kern_recvit() at kern_recvit+0x181/frame 0xfffffe0184d17d70
# sys_recvfrom() at sys_recvfrom+0xa2/frame 0xfffffe0184d17e00
# amd64_syscall() at amd64_syscall+0x169/frame 0xfffffe0184d17f30
# fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe0184d17f30
# --- syscall (0, FreeBSD ELF64, syscall), rip = 0x822882cca, rsp = 0x823572e88, rbp = 0x823572f90 ---
# KDB: enter: panic
# [ thread pid 11012 tid 138112 ]
# Stopped at         $0,0x121a722(%rip)
# db> x/s version
# version: FreeBSD 16.0-CURRENT #0 main-n280667-52eb7e394a7e-dirty: Sun Sep 28 08:56:14 CEST 2025
# pho@mercat1.netperf.freebsd.org:/usr/src/sys/amd64/compile/PHO
# db>

[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1

. ../default.cfg
set -u
prog=$(basename "$0" .sh)
cat > /tmp/$prog.c <<EOF
// https://syzkaller.appspot.com/bug?id=e33cdff88b17af77553159c4b372cac4e4bcd652
// autogenerated by syzkaller (https://github.com/google/syzkaller)
// syzbot+194f95f2c5fdffef1ef5@syzkaller.appspotmail.com

#define _GNU_SOURCE

#include <sys/types.h>

#include <dirent.h>
#include <errno.h>
#include <pthread.h>
#include <pwd.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/endian.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

static unsigned long long procid;

static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx __unused)
{
  if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
    exit(sig);
  }
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
  int valid = addr < prog_start || addr > prog_end;
  if (sig == SIGBUS)
    valid = 1;
  if (skip && valid) {
    _longjmp(segv_env, 1);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  struct sigaction sa;
  memset(&sa, 0, sizeof(sa));
  sa.sa_sigaction = segv_handler;
  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
  sigaction(SIGSEGV, &sa, NULL);
  sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...)                                                        \
  ({                                                                           \
    int ok = 1;                                                                \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    } else                                                                     \
      ok = 0;                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    ok;                                                                        \
  })

static void kill_and_wait(int pid, int* status)
{
  kill(pid, SIGKILL);
  while (waitpid(-1, status, 0) != pid) {
  }
}

static void sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

static void reset_flags(const char* filename)
{
  struct stat st;
  if (lstat(filename, &st))
    exit(1);
  st.st_flags &= ~(SF_NOUNLINK | UF_NOUNLINK | SF_IMMUTABLE | UF_IMMUTABLE |
                   SF_APPEND | UF_APPEND);
  if (lchflags(filename, st.st_flags))
    exit(1);
}
static void __attribute__((noinline)) remove_dir(const char* dir)
{
  DIR* dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EACCES) {
      if (rmdir(dir))
        exit(1);
      return;
    }
    exit(1);
  }
  struct dirent* ep = 0;
  while ((ep = readdir(dp))) {
    if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
      continue;
    char filename[FILENAME_MAX];
    snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
    struct stat st;
    if (lstat(filename, &st))
      exit(1);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    if (unlink(filename)) {
      if (errno == EPERM) {
        reset_flags(filename);
        reset_flags(dir);
        if (unlink(filename) == 0)
          continue;
      }
      exit(1);
    }
  }
  closedir(dp);
  while (rmdir(dir)) {
    if (errno == EPERM) {
      reset_flags(dir);
      if (rmdir(dir) == 0)
        break;
    }
    exit(1);
  }
}

static void thread_start(void* (*fn)(void*), void* arg)
{
  pthread_t th;
  pthread_attr_t attr;
  pthread_attr_init(&attr);
  pthread_attr_setstacksize(&attr, 128 << 10);
  int i = 0;
  for (; i < 100; i++) {
    if (pthread_create(&th, &attr, fn, arg) == 0) {
      pthread_attr_destroy(&attr);
      return;
    }
    if (errno == EAGAIN) {
      usleep(50);
      continue;
    }
    break;
  }
  exit(1);
}

typedef struct {
  pthread_mutex_t mu;
  pthread_cond_t cv;
  int state;
} event_t;

static void event_init(event_t* ev)
{
  if (pthread_mutex_init(&ev->mu, 0))
    exit(1);
  if (pthread_cond_init(&ev->cv, 0))
    exit(1);
  ev->state = 0;
}

static void event_reset(event_t* ev)
{
  ev->state = 0;
}

static void event_set(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  if (ev->state)
    exit(1);
  ev->state = 1;
  pthread_mutex_unlock(&ev->mu);
  pthread_cond_broadcast(&ev->cv);
}

static void event_wait(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  while (!ev->state)
    pthread_cond_wait(&ev->cv, &ev->mu);
  pthread_mutex_unlock(&ev->mu);
}

static int event_isset(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  pthread_mutex_lock(&ev->mu);
  for (;;) {
    if (ev->state)
      break;
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    pthread_cond_timedwait(&ev->cv, &ev->mu, &ts);
    now = current_time_ms();
    if (now - start > timeout)
      break;
  }
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

static void sandbox_common()
{
  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 = 1 << 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);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
}

static void loop();

static int do_sandbox_none(void)
{
  sandbox_common();
  loop();
  return 0;
}

struct thread_t {
  int created, call;
  event_t ready, done;
};

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

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    event_wait(&th->ready);
    event_reset(&th->ready);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    event_set(&th->done);
  }
  return 0;
}

static void execute_one(void)
{
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  int i, call, thread;
  for (call = 0; call < 3; call++) {
    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
         thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        event_init(&th->ready);
        event_init(&th->done);
        event_set(&th->done);
        thread_start(thr, th);
      }
      if (!event_isset(&th->done))
        continue;
      event_reset(&th->done);
      th->call = call;
      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
      event_set(&th->ready);
      event_timedwait(&th->done, 50);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

static void execute_one(void);

#define WAIT_FLAGS 0

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      exit(1);
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      if (chdir(cwdbuf))
        exit(1);
      execute_one();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      sleep_ms(10);
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
    remove_dir(cwdbuf);
  }
}

uint64_t r[1] = {0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    //  socket arguments: [
    //    domain: socket_domain = 0x26 (8 bytes)
    //    type: socket_type = 0x2 (8 bytes)
    //    proto: int8 = 0x0 (1 bytes)
    //  ]
    //  returns sock
    res = syscall(SYS_socket, /*domain=AF_INET|0x24*/ 0x26ul,
                  /*type=SOCK_DGRAM*/ 2ul, /*proto=*/0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    //  bind arguments: [
    //    fd: sock (resource)
    //    addr: ptr[in, sockaddr_storage] {
    //      union sockaddr_storage {
    //        in6: sockaddr_in6 {
    //          len: len = 0x22 (1 bytes)
    //          family: const = 0x1c (1 bytes)
    //          port: proc = 0x3 (2 bytes)
    //          flow: int32 = 0x0 (4 bytes)
    //          addr: union ipv6_addr {
    //            mcast1: ipv6_addr_multicast1 {
    //              a0: const = 0xff (1 bytes)
    //              a1: const = 0x1 (1 bytes)
    //              a2: buffer: {00 00 00 00 00 00 00 00 00 00 00 00 00} (length
    //              0xd) a3: const = 0x1 (1 bytes)
    //            }
    //          }
    //          scope: int32 = 0x0 (4 bytes)
    //        }
    //      }
    //    }
    //    addrlen: len = 0xc (8 bytes)
    //  ]
    NONFAILING(*(uint8_t*)0x200000000040 = 0x22);
    NONFAILING(*(uint8_t*)0x200000000041 = 0x1c);
    NONFAILING(*(uint16_t*)0x200000000042 = htobe16(0x4e23 + procid * 4));
    NONFAILING(*(uint32_t*)0x200000000044 = 0);
    NONFAILING(*(uint8_t*)0x200000000048 = -1);
    NONFAILING(*(uint8_t*)0x200000000049 = 1);
    NONFAILING(memset((void*)0x20000000004a, 0, 13));
    NONFAILING(*(uint8_t*)0x200000000057 = 1);
    NONFAILING(*(uint32_t*)0x200000000058 = 0);
    syscall(SYS_bind, /*fd=*/r[0], /*addr=*/0x200000000040ul,
            /*addrlen=*/0xcul);
    break;
  case 2:
    //  recvfrom\$inet arguments: [
    //    fd: sock_in (resource)
    //    buf: nil
    //    len: len = 0x51 (8 bytes)
    //    f: recv_flags = 0x401313ab1a02f21f (8 bytes)
    //    addr: nil
    //    addrlen: len = 0x0 (8 bytes)
    //  ]
    syscall(SYS_recvfrom, /*fd=*/r[0], /*buf=*/0ul, /*len=*/0x51ul,
            /*f=MSG_PEEK|MSG_OOB|0x401313ab1a02f21c*/ 0x401313ab1a02f21ful,
            /*addr=*/0ul, /*addrlen=*/0ul);
    break;
  }
}
int main(void)
{
  syscall(SYS_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x1012ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  install_segv_handler();
  for (procid = 0; procid < 4; procid++) {
    if (fork() == 0) {
      use_temporary_dir();
      do_sandbox_none();
    }
  }
  sleep(1000000);
  return 0;
}
EOF
mycc -o /tmp/$prog -Wall -Wextra -O0 /tmp/$prog.c -pthread || exit 1

(cd ../testcases/swap; ./swap -t 5m -i 20 -l 100 > /dev/null 2>&1) &
sleep 5

work=/tmp/$prog.dir
rm -rf $work
mkdir $work
cd /tmp/$prog.dir

timeout 5m /tmp/$prog > /dev/null 2>&1

while pkill swap; do :; done
wait

rm -rf /tmp/$prog /tmp/$prog.c /tmp/$prog.core /tmp/syzkaller.?????? $work
exit 0