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Date:      Mon, 2 Mar 2020 06:25:43 +0000 (UTC)
From:      Peter Holm <pho@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-user@freebsd.org
Subject:   svn commit: r358519 - user/pho/stress2/misc
Message-ID:  <202003020625.0226Phis048878@repo.freebsd.org>

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Author: pho
Date: Mon Mar  2 06:25:42 2020
New Revision: 358519
URL: https://svnweb.freebsd.org/changeset/base/358519

Log:
  Added a syzkaller "C reproducer".

Added:
  user/pho/stress2/misc/syzkaller4.sh   (contents, props changed)

Added: user/pho/stress2/misc/syzkaller4.sh
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ user/pho/stress2/misc/syzkaller4.sh	Mon Mar  2 06:25:42 2020	(r358519)
@@ -0,0 +1,384 @@
+#!/bin/sh
+
+# panic: Assertion mtx_unowned(m) failed at ../../../kern/kern_mutex.c:1179
+# cpuid = 2
+# time = 1581180711
+# KDB: stack backtrace:
+# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00e57958c0
+# vpanic() at vpanic+0x185/frame 0xfffffe00e5795920
+# panic() at panic+0x43/frame 0xfffffe00e5795980
+# _mtx_destroy() at _mtx_destroy+0x4c/frame 0xfffffe00e57959a0
+# solisten_proto() at solisten_proto+0xdb/frame 0xfffffe00e5795a00
+# tcp6_usr_listen() at tcp6_usr_listen+0x16d/frame 0xfffffe00e5795a60
+# solisten() at solisten+0x42/frame 0xfffffe00e5795a80
+# kern_listen() at kern_listen+0x80/frame 0xfffffe00e5795ac0
+# amd64_syscall() at amd64_syscall+0x2f1/frame 0xfffffe00e5795bf0
+# fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe00e5795bf0
+
+# $FreeBSD$
+
+[ `uname -p` = "i386" ] && exit 0
+
+. ../default.cfg
+cat > /tmp/syzkaller4.c <<EOF
+// https://syzkaller.appspot.com/bug?id=db195d1b0b8ca408a46f301eba33f9457bd2d429
+// autogenerated by syzkaller (https://github.com/google/syzkaller)
+
+#define _GNU_SOURCE
+
+#include <sys/types.h>
+
+#include <errno.h>
+#include <pthread.h>
+#include <pwd.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/syscall.h>
+#include <sys/wait.h>
+#include <time.h>
+#include <unistd.h>
+
+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 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;
+  for (i = 0; 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;
+}
+
+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)
+{
+  int i, call, thread;
+  int collide = 0;
+again:
+  for (call = 0; call < 19; 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);
+      if (collide && (call % 2) == 0)
+        break;
+      event_timedwait(&th->done, 45);
+      break;
+    }
+  }
+  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
+    sleep_ms(1);
+  if (!collide) {
+    collide = 1;
+    goto again;
+  }
+}
+
+static void execute_one(void);
+
+#define WAIT_FLAGS 0
+
+static void loop(void)
+{
+  int iter;
+  for (iter = 0;; iter++) {
+    int pid = fork();
+    if (pid < 0)
+      exit(1);
+    if (pid == 0) {
+      execute_one();
+      exit(0);
+    }
+    int status = 0;
+    uint64_t start = current_time_ms();
+    for (;;) {
+      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
+        break;
+      sleep_ms(1);
+      if (current_time_ms() - start < 5 * 1000)
+        continue;
+      kill_and_wait(pid, &status);
+      break;
+    }
+  }
+}
+
+uint64_t r[6] = {0x0, 0xffffffffffffffff, 0x0, 0xffffffffffffffff,
+                 0x0, 0xffffffffffffffff};
+
+void execute_call(int call)
+{
+  intptr_t res;
+  switch (call) {
+  case 0:
+    *(uint32_t*)0x20000040 = 0x284002b0;
+    *(uint32_t*)0x20000044 = 0;
+    *(uint32_t*)0x20000048 = 0;
+    *(uint32_t*)0x2000004c = 0;
+    *(uint32_t*)0x20000050 = 0;
+    *(uint32_t*)0x20000054 = 0;
+    *(uint16_t*)0x20000058 = 0;
+    *(uint16_t*)0x2000005a = 0;
+    *(uint64_t*)0x20000060 = 0;
+    *(uint64_t*)0x20000068 = 0;
+    *(uint64_t*)0x20000070 = 0;
+    *(uint64_t*)0x20000078 = 0;
+    *(uint64_t*)0x20000080 = 0;
+    *(uint64_t*)0x20000088 = 0;
+    *(uint64_t*)0x20000090 = 0;
+    syscall(SYS___semctl, 0, 0ul, 0xaul, 0x20000040ul);
+    break;
+  case 1:
+    memcpy(
+        (void*)0x20000340,
+        "\x82\x02\xf3\x89\x9c\x53\x3e\x9e\x79\x9b\xd7\xc7\x3c\xcc\x8e\xf9\xba"
+        "\xb3\x80\xca\x99\xbc\x30\xf1\x8e\x7c\xb0\xc5\x3f\xd6\xa9\xe6\xc6\xa8"
+        "\xa8\x85\x82\x5b\xdf\x69\xb0\xb9\xed\x55\x59\xd8\x3d\x18\x64\x0d\x49"
+        "\xdd\x0c\x5b\xba\x14\x0e\xe4\x61\xce\xcf\x6c\x04\x6a\xa1\xda\xa6\x9a"
+        "\x50\xf8\xa5\xbf\x52\xc2\x63\xf1\x48\xad\xb2\x3e\x5b\x74\xd4\xd3\xe2"
+        "\x77\x4e\xe8\xef\x92\x6d\x3e\xf6\x35\x76\x60\x9b\x83\xfd\xbc\x00\x45"
+        "\xd8\x01\x38\x8b\x7b\x9f\x82\x1e\xf2\xe6\x42\xd3\x73\x00\x00\xc4\x05"
+        "\xc0\xc2\x1a\x82\xc5\x8e\x64\x2d\x07\x86\x09\x4f\xb0\x60\x2a\x5b\xfd"
+        "\x33\x73\x24\x41\xb5\xaa\x99\xd6\xdf\xbe\x06\xc7\x27\x48\x7e\x13\xfb"
+        "\x57\xd6\x2f\xcb\x0c\xda\x92\xcc\xc7\x0f\xb4\x6f\x95\xcb\x5d\x0c\x28"
+        "\x93\x70\xbc\x25\x88\x76\x2f\xd7\x86\x9e\x5e\x03\xfa\x9c\x68\xde\x52"
+        "\x23\xc5\xae\xa1\x1c\x58\x79\x1a\x6f\xfa\x52\x31\xfc\x2b\xd5\x33\x3d"
+        "\x49\x60\x80\xa0\x31\x16\x7e\xa5\xd5\x09\x94\x53\x1e\x3b\x56\x3f\x1e"
+        "\x4d\x95\x76\x44\x9d\x59\x7a\x2d\xbc\xea\xe3\x26\x0d\xf6\x68\xee\xba"
+        "\xc3\xbb\x9f\xb6\xf1\xa2\x44\xc2\x96\xd5\xdc\xc4\x1c\xa2\xaf\xeb\x92"
+        "\x4e\xaf\xfc\x1d\x5d\xaf\x30\x9b\x0b\xfd\x19\x1c\x40\xf9\xd0\x0d\xf5"
+        "\x15\x94\xb7\xe9",
+        276);
+    syscall(SYS_connect, -1, 0x20000340ul, 0x10ul);
+    break;
+  case 2:
+    res = syscall(SYS_semget, 0ul, 0ul, 0x284ul);
+    if (res != -1)
+      r[0] = res;
+    break;
+  case 3:
+    res = syscall(SYS_socket, 0x1cul, 1ul, 0ul);
+    if (res != -1)
+      r[1] = res;
+    break;
+  case 4:
+    syscall(SYS_listen, r[1], 0);
+    break;
+  case 5:
+    res = syscall(SYS_fstat, r[1], 0x20000080ul);
+    if (res != -1)
+      r[2] = *(uint32_t*)0x200000a0;
+    break;
+  case 6:
+    *(uint32_t*)0x20000180 = 0x2840029c;
+    *(uint32_t*)0x20000184 = 0;
+    *(uint32_t*)0x20000188 = 0;
+    *(uint32_t*)0x2000018c = 0;
+    *(uint32_t*)0x20000190 = r[2];
+    *(uint32_t*)0x20000194 = 0;
+    *(uint16_t*)0x20000198 = 0;
+    *(uint16_t*)0x2000019a = 0;
+    *(uint64_t*)0x200001a0 = 0;
+    *(uint64_t*)0x200001a8 = 0;
+    *(uint64_t*)0x200001b0 = 0;
+    *(uint64_t*)0x200001b8 = 0;
+    *(uint64_t*)0x200001c0 = 0;
+    *(uint64_t*)0x200001c8 = 0;
+    *(uint64_t*)0x200001d0 = 0;
+    syscall(SYS___semctl, r[0], 0ul, 0xaul, 0x20000180ul);
+    break;
+  case 7:
+    res = syscall(SYS_socket, 0x1cul, 1ul, 0x84ul);
+    if (res != -1)
+      r[3] = res;
+    break;
+  case 8:
+    syscall(SYS_connect, r[3], 0ul, 0ul);
+    break;
+  case 9:
+    syscall(SYS_fcntl, r[3], 5ul, 0);
+    break;
+  case 10:
+    syscall(SYS_getresuid, 0x20000040ul, 0ul, 0ul);
+    break;
+  case 11:
+    syscall(SYS___semctl, 0, 0ul, 0xaul, 0ul);
+    break;
+  case 12:
+    syscall(SYS___semctl, 0, 0ul, 1ul, 0ul);
+    break;
+  case 13:
+    res = syscall(SYS_semget, 0ul, 0ul, 0x284ul);
+    if (res != -1)
+      r[4] = res;
+    break;
+  case 14:
+    syscall(SYS_freebsd11_fstat, -1, 0ul);
+    break;
+  case 15:
+    syscall(SYS___semctl, r[4], 0ul, 1ul, 0ul);
+    break;
+  case 16:
+    res = syscall(SYS_socket, 0x1cul, 1ul, 0ul);
+    if (res != -1)
+      r[5] = res;
+    break;
+  case 17:
+    syscall(SYS_listen, r[5], 0);
+    break;
+  case 18:
+    syscall(SYS_fstat, r[5], 0ul);
+    break;
+  }
+}
+int main(void)
+{
+  syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x1012ul, -1, 0ul);
+  loop();
+  return 0;
+}
+EOF
+mycc -o /tmp/syzkaller4 -Wall -Wextra -O2 /tmp/syzkaller4.c -lpthread ||
+    exit 1
+
+(cd /tmp; ./syzkaller4)
+
+rm /tmp/syzkaller4 /tmp/syzkaller4.c
+exit 0



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