xref: /freebsd/tools/test/stress2/misc/syzkaller23.sh (revision 2e3f49888ec8851bafb22011533217487764fdb0) 
1#!/bin/sh
2
3# panic: Bad link elm 0xfffff80b62eb7500 prev->next != elm
4# cpuid = 2
5# time = 1598546886
6# KDB: stack backtrace:
7# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe010154a6e0
8# vpanic() at vpanic+0x182/frame 0xfffffe010154a730
9# panic() at panic+0x43/frame 0xfffffe010154a790
10# unp_disconnect() at unp_disconnect+0x279/frame 0xfffffe010154a7c0
11# uipc_disconnect() at uipc_disconnect+0xfd/frame 0xfffffe010154a800
12# soclose() at soclose+0xa2/frame 0xfffffe010154a870
13# _fdrop() at _fdrop+0x1a/frame 0xfffffe010154a890
14# closef() at closef+0x1ea/frame 0xfffffe010154a920
15# fdescfree_fds() at fdescfree_fds+0x8c/frame 0xfffffe010154a980
16# fdescfree() at fdescfree+0x3cd/frame 0xfffffe010154aa50
17# exit1() at exit1+0x487/frame 0xfffffe010154aac0
18# sys_sys_exit() at sys_sys_exit+0xd/frame 0xfffffe010154aad0
19# amd64_syscall() at amd64_syscall+0x159/frame 0xfffffe010154abf0
20# fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe010154abf0
21# --- syscall (1, FreeBSD ELF64, sys_sys_exit), rip = 0x80045376a, rsp = 0x7fffffffe4c8, rbp = 0x7fffffffe4e0 ---
22
23[ `uname -p` != "amd64" ] && exit 0
24
25# Obtained from markj (syzkaller).
26
27. ../default.cfg
28cat > /tmp/syzkaller23.c <<EOF
29// autogenerated by syzkaller (https://github.com/google/syzkaller)
30
31#define _GNU_SOURCE
32
33#include <sys/types.h>
34
35#include <dirent.h>
36#include <errno.h>
37#include <pthread.h>
38#include <pwd.h>
39#include <setjmp.h>
40#include <signal.h>
41#include <stdarg.h>
42#include <stdbool.h>
43#include <stdint.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <string.h>
47#include <sys/endian.h>
48#include <sys/stat.h>
49#include <sys/syscall.h>
50#include <sys/wait.h>
51#include <time.h>
52#include <unistd.h>
53
54static __thread int skip_segv;
55static __thread jmp_buf segv_env;
56
57static void segv_handler(int sig, siginfo_t* info, void* ctx __unused)
58{
59  uintptr_t addr = (uintptr_t)info->si_addr;
60  const uintptr_t prog_start = 1 << 20;
61  const uintptr_t prog_end = 100 << 20;
62  int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
63  int valid = addr < prog_start || addr > prog_end;
64  if (sig == SIGBUS) {
65    valid = 1;
66  }
67  if (skip && valid) {
68    _longjmp(segv_env, 1);
69  }
70  exit(sig);
71}
72
73static void install_segv_handler(void)
74{
75  struct sigaction sa;
76  memset(&sa, 0, sizeof(sa));
77  sa.sa_sigaction = segv_handler;
78  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
79  sigaction(SIGSEGV, &sa, NULL);
80  sigaction(SIGBUS, &sa, NULL);
81}
82
83#define NONFAILING(...)                                                        \
84  {                                                                            \
85    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
86    if (_setjmp(segv_env) == 0) {                                              \
87      __VA_ARGS__;                                                             \
88    }                                                                          \
89    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
90  }
91
92static void kill_and_wait(int pid, int* status)
93{
94  kill(pid, SIGKILL);
95  while (waitpid(-1, status, 0) != pid) {
96  }
97}
98
99static void sleep_ms(uint64_t ms)
100{
101  usleep(ms * 1000);
102}
103
104static uint64_t current_time_ms(void)
105{
106  struct timespec ts;
107  if (clock_gettime(CLOCK_MONOTONIC, &ts))
108    exit(1);
109  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
110}
111
112static void use_temporary_dir(void)
113{
114  char tmpdir_template[] = "./syzkaller.XXXXXX";
115  char* tmpdir = mkdtemp(tmpdir_template);
116  if (!tmpdir)
117    exit(1);
118  if (chmod(tmpdir, 0777))
119    exit(1);
120  if (chdir(tmpdir))
121    exit(1);
122}
123
124static void remove_dir(const char* dir)
125{
126  DIR* dp = opendir(dir);
127  if (dp == NULL)
128    exit(1);
129  struct dirent* ep = 0;
130  while ((ep = readdir(dp))) {
131    if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
132      continue;
133    char filename[FILENAME_MAX];
134    snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
135    struct stat st;
136    if (lstat(filename, &st))
137      exit(1);
138    if (S_ISDIR(st.st_mode)) {
139      remove_dir(filename);
140      continue;
141    }
142    if (unlink(filename))
143      exit(1);
144  }
145  closedir(dp);
146  if (rmdir(dir))
147    exit(1);
148}
149
150static void thread_start(void* (*fn)(void*), void* arg)
151{
152  pthread_t th;
153  pthread_attr_t attr;
154  pthread_attr_init(&attr);
155  pthread_attr_setstacksize(&attr, 128 << 10);
156  int i = 0;
157  for (; i < 100; i++) {
158    if (pthread_create(&th, &attr, fn, arg) == 0) {
159      pthread_attr_destroy(&attr);
160      return;
161    }
162    if (errno == EAGAIN) {
163      usleep(50);
164      continue;
165    }
166    break;
167  }
168  exit(1);
169}
170
171typedef struct {
172  pthread_mutex_t mu;
173  pthread_cond_t cv;
174  int state;
175} event_t;
176
177static void event_init(event_t* ev)
178{
179  if (pthread_mutex_init(&ev->mu, 0))
180    exit(1);
181  if (pthread_cond_init(&ev->cv, 0))
182    exit(1);
183  ev->state = 0;
184}
185
186static void event_reset(event_t* ev)
187{
188  ev->state = 0;
189}
190
191static void event_set(event_t* ev)
192{
193  pthread_mutex_lock(&ev->mu);
194  if (ev->state)
195    exit(1);
196  ev->state = 1;
197  pthread_mutex_unlock(&ev->mu);
198  pthread_cond_broadcast(&ev->cv);
199}
200
201static void event_wait(event_t* ev)
202{
203  pthread_mutex_lock(&ev->mu);
204  while (!ev->state)
205    pthread_cond_wait(&ev->cv, &ev->mu);
206  pthread_mutex_unlock(&ev->mu);
207}
208
209static int event_isset(event_t* ev)
210{
211  pthread_mutex_lock(&ev->mu);
212  int res = ev->state;
213  pthread_mutex_unlock(&ev->mu);
214  return res;
215}
216
217static int event_timedwait(event_t* ev, uint64_t timeout)
218{
219  uint64_t start = current_time_ms();
220  uint64_t now = start;
221  pthread_mutex_lock(&ev->mu);
222  for (;;) {
223    if (ev->state)
224      break;
225    uint64_t remain = timeout - (now - start);
226    struct timespec ts;
227    ts.tv_sec = remain / 1000;
228    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
229    pthread_cond_timedwait(&ev->cv, &ev->mu, &ts);
230    now = current_time_ms();
231    if (now - start > timeout)
232      break;
233  }
234  int res = ev->state;
235  pthread_mutex_unlock(&ev->mu);
236  return res;
237}
238
239struct thread_t {
240  int created, call;
241  event_t ready, done;
242};
243
244static struct thread_t threads[16];
245static void execute_call(int call);
246static int running;
247
248static void* thr(void* arg)
249{
250  struct thread_t* th = (struct thread_t*)arg;
251  for (;;) {
252    event_wait(&th->ready);
253    event_reset(&th->ready);
254    execute_call(th->call);
255    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
256    event_set(&th->done);
257  }
258  return 0;
259}
260
261static void execute_one(void)
262{
263  int i, call, thread;
264  int collide = 0;
265again:
266  for (call = 0; call < 5; call++) {
267    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
268         thread++) {
269      struct thread_t* th = &threads[thread];
270      if (!th->created) {
271        th->created = 1;
272        event_init(&th->ready);
273        event_init(&th->done);
274        event_set(&th->done);
275        thread_start(thr, th);
276      }
277      if (!event_isset(&th->done))
278        continue;
279      event_reset(&th->done);
280      th->call = call;
281      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
282      event_set(&th->ready);
283      if (collide && (call % 2) == 0)
284        break;
285      event_timedwait(&th->done, 45);
286      break;
287    }
288  }
289  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
290    sleep_ms(1);
291  if (!collide) {
292    collide = 1;
293    goto again;
294  }
295}
296
297static void execute_one(void);
298
299#define WAIT_FLAGS 0
300
301static void loop(void)
302{
303  int iter = 0;
304  for (;; iter++) {
305    char cwdbuf[32];
306    sprintf(cwdbuf, "./%d", iter);
307    if (mkdir(cwdbuf, 0777))
308      exit(1);
309    int pid = fork();
310    if (pid < 0)
311      exit(1);
312    if (pid == 0) {
313      if (chdir(cwdbuf))
314        exit(1);
315      execute_one();
316      exit(0);
317    }
318    int status = 0;
319    uint64_t start = current_time_ms();
320    for (;;) {
321      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
322        break;
323      sleep_ms(1);
324      if (current_time_ms() - start < 5 * 1000)
325        continue;
326      kill_and_wait(pid, &status);
327      break;
328    }
329    remove_dir(cwdbuf);
330  }
331}
332
333uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};
334
335void execute_call(int call)
336{
337  intptr_t res = 0;
338  switch (call) {
339  case 0:
340    NONFAILING(memcpy((void*)0x20000000, ".\000", 2));
341    res = syscall(SYS_open, 0x20000000ul, 0ul, 0ul);
342    if (res != -1)
343      r[0] = res;
344    break;
345  case 1:
346    res = syscall(SYS_socketpair, 1ul, 2ul, 0, 0x20000100ul);
347    if (res != -1)
348      NONFAILING(r[1] = *(uint32_t*)0x20000100);
349    break;
350  case 2:
351    NONFAILING(memcpy(
352        (void*)0x20000180,
353        "\x0a\x01\x2e\x2f\x66\x69\x6c\x65\x30\x00\x46\xd3\xc5\xea\xb2\xf9\xd0"
354        "\x81\x73\xef\x4a\xd0\xe9\x00\x9b\x10\xb2\x6d\x40\xab\xf3\x06\x35\x55"
355        "\x92\x6b\xa7\x48\x51\xed\xf1\x47\x2a\x1c\x57\xda\x98\x4d\x23\x4f\x6d"
356        "\x63\x57\x71\x99\x01\x97\x42\xef\xe9\xd6\x91\x78\x55\x43\x7f\x80\x8b"
357        "\xf3\xfa\x29\xeb\x62\xeb\x2f\x4b\xb5\xcd\x3f\xd7\x4f\x78\x35\xfb\xd3"
358        "\x24\xe3\xc4\x10\x31\x53\xdd\xe7\x9a\x1c\x23\x36\x48\xe4\x7a\xf8\x3a"
359        "\x7e\xd0\x1f\x89\xf7\xb6\xee\xff\x69\x1d\xad\x02\x57\x01\xf2\x52\x93"
360        "\x3e\x6b\xda\x65\x2a\xc7\x6c\x27\xf9\x0a\xd4\x3b\x05\x00\x00\x00\x1b"
361        "\x1c\x89\xc9\x3b\x41\x9c\x7b\x4f\x31\xbb\x6a\x5c\x17\xed\x78\xf1\x64"
362        "\xc4\xa3\x17\x5c\x7a\x8c\x02\x75\x00\xaf\x61\xac\x90\x22\x86\x15\x67"
363        "\x90\x03\x17\x8c\x55\xf6\xb9\x3a\xf8\x6c\xab\xcb\xf1\x74\x09\xc0\xbc"
364        "\xf4\x5b\x76\x33\x8f\x9a\x76\xf3\x6e",
365        196));
366    syscall(SYS_bindat, r[0], r[1], 0x20000180ul, 0xaul);
367    break;
368  case 3:
369    NONFAILING(*(uint8_t*)0x20000040 = 0xa);
370    NONFAILING(*(uint8_t*)0x20000041 = 1);
371    NONFAILING(memcpy((void*)0x20000042, "./file0\000", 8));
372    syscall(SYS_connectat, r[0], r[1], 0x20000040ul, 0xaul);
373    break;
374  case 4:
375    NONFAILING(*(uint8_t*)0x20000000 = 0xa);
376    NONFAILING(*(uint8_t*)0x20000001 = 1);
377    NONFAILING(memcpy((void*)0x20000002, "./file0\000", 8));
378    syscall(SYS_connect, r[1], 0x20000000ul, 0xaul);
379    break;
380  }
381}
382int main(void)
383{
384  syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul);
385  install_segv_handler();
386  use_temporary_dir();
387  loop();
388  return 0;
389}
390EOF
391mycc -o /tmp/syzkaller23 -Wall -Wextra -O0 /tmp/syzkaller23.c -lpthread ||
392    exit 1
393
394for i in `jot 256`; do
395	(cd /tmp; timeout 3m ./syzkaller23) &
396done
397wait
398
399rm -rf /tmp/syzkaller23 /tmp/syzkaller23.c /tmp/syzkaller.*
400exit 0
401