xref: /freebsd/tools/test/stress2/misc/syzkaller49.sh (revision e0c4386e) 
1#!/bin/sh
2
3# Fatal trap 12: page fault while in kernel mode
4# cpuid = 10; apic id = 0a
5# fault virtual address   = 0x0
6# fault code              = supervisor read data, page not present
7# instruction pointer     = 0x20:0xffffffff80e04f35
8# stack pointer           = 0x28:0xfffffe014fd0fbc0
9# frame pointer           = 0x28:0xfffffe014fd0fc00
10# code segment            = base 0x0, limit 0xfffff, type 0x1b
11#                         = DPL 0, pres 1, long 1, def32 0, gran 1
12# processor eflags        = interrupt enabled, resume, IOPL = 0
13# current process         = 13332 (repro77)
14# trap number             = 12
15# panic: page fault
16# cpuid = 10
17# time = 1640585179
18# KDB: stack backtrace:
19# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe014fd0f980
20# vpanic() at vpanic+0x17f/frame 0xfffffe014fd0f9d0
21# panic() at panic+0x43/frame 0xfffffe014fd0fa30
22# trap_fatal() at trap_fatal+0x385/frame 0xfffffe014fd0fa90
23# trap_pfault() at trap_pfault+0xab/frame 0xfffffe014fd0faf0
24# calltrap() at calltrap+0x8/frame 0xfffffe014fd0faf0
25# --- trap 0xc, rip = 0xffffffff80e04f35, rsp = 0xfffffe014fd0fbc0, rbp = 0xfffffe014fd0fc00 ---
26# tcp_usr_rcvd() at tcp_usr_rcvd+0x65/frame 0xfffffe014fd0fc00
27# soreceive_generic() at soreceive_generic+0xe44/frame 0xfffffe014fd0fcc0
28# soreceive() at soreceive+0x4b/frame 0xfffffe014fd0fce0
29# kern_recvit() at kern_recvit+0x1ba/frame 0xfffffe014fd0fd90
30# sys_recvmsg() at sys_recvmsg+0x6f/frame 0xfffffe014fd0fe00
31# amd64_syscall() at amd64_syscall+0x145/frame 0xfffffe014fd0ff30
32# fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe014fd0ff30
33# --- syscall (0, FreeBSD ELF64, nosys), rip = 0x8020e328a, rsp = 0x22f48, rbp = 0x22f70 ---
34# KDB: enter: panic
35# [ thread pid 13332 tid 103311 ]
36# Stopped at      kdb_enter+0x37: movq    $0,0x128720e(%rip)
37# db> x/s version
38# version: FreeBSD 14.0-CURRENT #0 ufs-n251956-c3008785b91: Mon Dec 27 06:11:30 CET 2021
39# pho@mercat1.netperf.freebsd.org:/var/tmp/deviant3/sys/amd64/compile/PHO
40# db>
41
42. ../default.cfg
43[ `id -u` -ne 0 ] && echo "Must be root!" && exit 1
44
45cat > /tmp/syzkaller49.c <<EOF
46// https://syzkaller.appspot.com/bug?id=efb2e9f019f36fbc39380724a31cb0c458bb4e61
47// autogenerated by syzkaller (https://github.com/google/syzkaller)
48// Reported-by: syzbot+93c75c4618b2a4f0f0ac@syzkaller.appspotmail.com
49
50#define _GNU_SOURCE
51
52#include <errno.h>
53#include <pthread.h>
54#include <pwd.h>
55#include <stdarg.h>
56#include <stdbool.h>
57#include <stdint.h>
58#include <stdio.h>
59#include <stdlib.h>
60#include <string.h>
61#include <sys/endian.h>
62#include <sys/syscall.h>
63#include <time.h>
64#include <unistd.h>
65
66static void sleep_ms(uint64_t ms)
67{
68  usleep(ms * 1000);
69}
70
71static uint64_t current_time_ms(void)
72{
73  struct timespec ts;
74  if (clock_gettime(CLOCK_MONOTONIC, &ts))
75    exit(1);
76  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
77}
78
79static void thread_start(void* (*fn)(void*), void* arg)
80{
81  pthread_t th;
82  pthread_attr_t attr;
83  pthread_attr_init(&attr);
84  pthread_attr_setstacksize(&attr, 128 << 10);
85  int i = 0;
86  for (; i < 100; i++) {
87    if (pthread_create(&th, &attr, fn, arg) == 0) {
88      pthread_attr_destroy(&attr);
89      return;
90    }
91    if (errno == EAGAIN) {
92      usleep(50);
93      continue;
94    }
95    break;
96  }
97  exit(1);
98}
99
100typedef struct {
101  pthread_mutex_t mu;
102  pthread_cond_t cv;
103  int state;
104} event_t;
105
106static void event_init(event_t* ev)
107{
108  if (pthread_mutex_init(&ev->mu, 0))
109    exit(1);
110  if (pthread_cond_init(&ev->cv, 0))
111    exit(1);
112  ev->state = 0;
113}
114
115static void event_reset(event_t* ev)
116{
117  ev->state = 0;
118}
119
120static void event_set(event_t* ev)
121{
122  pthread_mutex_lock(&ev->mu);
123  if (ev->state)
124    exit(1);
125  ev->state = 1;
126  pthread_mutex_unlock(&ev->mu);
127  pthread_cond_broadcast(&ev->cv);
128}
129
130static void event_wait(event_t* ev)
131{
132  pthread_mutex_lock(&ev->mu);
133  while (!ev->state)
134    pthread_cond_wait(&ev->cv, &ev->mu);
135  pthread_mutex_unlock(&ev->mu);
136}
137
138static int event_isset(event_t* ev)
139{
140  pthread_mutex_lock(&ev->mu);
141  int res = ev->state;
142  pthread_mutex_unlock(&ev->mu);
143  return res;
144}
145
146static int event_timedwait(event_t* ev, uint64_t timeout)
147{
148  uint64_t start = current_time_ms();
149  uint64_t now = start;
150  pthread_mutex_lock(&ev->mu);
151  for (;;) {
152    if (ev->state)
153      break;
154    uint64_t remain = timeout - (now - start);
155    struct timespec ts;
156    ts.tv_sec = remain / 1000;
157    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
158    pthread_cond_timedwait(&ev->cv, &ev->mu, &ts);
159    now = current_time_ms();
160    if (now - start > timeout)
161      break;
162  }
163  int res = ev->state;
164  pthread_mutex_unlock(&ev->mu);
165  return res;
166}
167
168struct thread_t {
169  int created, call;
170  event_t ready, done;
171};
172
173static struct thread_t threads[16];
174static void execute_call(int call);
175static int running;
176
177static void* thr(void* arg)
178{
179  struct thread_t* th = (struct thread_t*)arg;
180  for (;;) {
181    event_wait(&th->ready);
182    event_reset(&th->ready);
183    execute_call(th->call);
184    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
185    event_set(&th->done);
186  }
187  return 0;
188}
189
190static void loop(void)
191{
192  int i, call, thread;
193  for (call = 0; call < 6; call++) {
194    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
195         thread++) {
196      struct thread_t* th = &threads[thread];
197      if (!th->created) {
198        th->created = 1;
199        event_init(&th->ready);
200        event_init(&th->done);
201        event_set(&th->done);
202        thread_start(thr, th);
203      }
204      if (!event_isset(&th->done))
205        continue;
206      event_reset(&th->done);
207      th->call = call;
208      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
209      event_set(&th->ready);
210      event_timedwait(&th->done, 50);
211      break;
212    }
213  }
214  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
215    sleep_ms(1);
216}
217
218uint64_t r[1] = {0xffffffffffffffff};
219
220void execute_call(int call)
221{
222  intptr_t res = 0;
223  switch (call) {
224  case 0:
225    res = syscall(SYS_socket, 2ul, 1ul, 0);
226    if (res != -1)
227      r[0] = res;
228    break;
229  case 1:
230    *(uint8_t*)0x20000140 = 0x10;
231    *(uint8_t*)0x20000141 = 2;
232    *(uint16_t*)0x20000142 = htobe16(0x4e23);
233    *(uint32_t*)0x20000144 = htobe32(0x7f000001);
234    memset((void*)0x20000148, 0, 8);
235    syscall(SYS_bind, r[0], 0x20000140ul, 0x10ul);
236    break;
237  case 2:
238    *(uint8_t*)0x20000080 = 0x10;
239    *(uint8_t*)0x20000081 = 2;
240    *(uint16_t*)0x20000082 = htobe16(0x4e23);
241    *(uint32_t*)0x20000084 = htobe32(0x7f000001);
242    memset((void*)0x20000088, 0, 8);
243    syscall(SYS_sendto, r[0], 0ul, 0ul, 0ul, 0x20000080ul, 0x10ul);
244    break;
245  case 3:
246    memset((void*)0x20000100, 69, 1);
247    syscall(SYS_sendto, r[0], 0x20000100ul, 0xfda4ul, 0ul, 0ul, 0ul);
248    break;
249  case 4:
250    *(uint64_t*)0x200003c0 = 0;
251    *(uint32_t*)0x200003c8 = 0;
252    *(uint64_t*)0x200003d0 = 0x20000340;
253    *(uint64_t*)0x20000340 = 0x20000680;
254    *(uint64_t*)0x20000348 = 0x19000;
255    *(uint64_t*)0x200003d8 = 1;
256    *(uint64_t*)0x200003e0 = 0;
257    *(uint64_t*)0x200003e8 = 0;
258    *(uint32_t*)0x200003f0 = 0;
259    syscall(SYS_recvmsg, r[0], 0x200003c0ul, 0x40ul);
260    break;
261  case 5:
262    syscall(SYS_shutdown, r[0], 1ul);
263    break;
264  }
265}
266int main(void)
267{
268  syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul);
269  loop();
270  return 0;
271}
272EOF
273
274set -e
275mount | grep "on $mntpoint " | grep -q /dev/md && umount -f $mntpoint
276[ -c /dev/md$mdstart ] &&  mdconfig -d -u $mdstart
277mdconfig -a -t swap -s 5g -u $mdstart
278newfs $newfs_flags -n md$mdstart > /dev/null
279mount /dev/md$mdstart $mntpoint
280set +e
281
282mkdir $mntpoint/work
283mycc -o $mntpoint/work/syzkaller49 -Wall -Wextra -O0 /tmp/syzkaller49.c -lpthread || exit 1
284
285start=`date +%s`
286while [ $((`date +%s` - start)) -lt 120 ]; do
287	(cd $mntpoint/work; ./syzkaller49)
288done
289
290for i in `jot 6`; do
291	mount | grep -q "on $mntpoint " || break
292	umount $mntpoint && break || sleep 10
293	[ $i -eq 6 ] &&
294	    { echo FATAL; fstat -mf $mntpoint; exit 1; }
295done
296mdconfig -d -u $mdstart
297
298rm -rf /tmp/syzkaller49.c
299exit 0
300