unittest/gunit/segfault-t.cc

/* Copyright (c) 2011, 2021, Oracle and/or its affiliates.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */

// Always include (the generated) my_config.h, to get correct platform defines.
#include "my_config.h"
#include <gtest/gtest.h>

#include "thread_utils.h"
#include "test_utils.h"
#include "my_stacktrace.h"
#include "m_string.h"
#include "hash_filo.h"

namespace segfault_unittest {

using my_testing::Server_initializer;
using my_testing::Mock_error_handler;

class FatalSignalDeathTest : public ::testing::Test
{
protected:
  virtual void SetUp()
  {
    ::testing::FLAGS_gtest_death_test_style = "threadsafe";
    initializer.SetUp();
  }
  virtual void TearDown() { initializer.TearDown(); }

  Server_initializer initializer;
};


TEST_F(FatalSignalDeathTest, Abort)
{
#if defined(_WIN32)
  MY_EXPECT_DEATH_IF_SUPPORTED(abort(), ".* UTC - mysqld got exception.*");
#else
  MY_EXPECT_DEATH_IF_SUPPORTED(abort(), ".* UTC - mysqld got signal 6.*");
#endif
}


TEST_F(FatalSignalDeathTest, Segfault)
{
  int *pint= NULL;
#if defined(_WIN32)
  /*
   After upgrading from gtest 1.5 to 1.6 this segfault is no longer
   caught by handle_fatal_signal(). We get an empty error message from the
   gtest library instead.
  */
  MY_EXPECT_DEATH_IF_SUPPORTED(*pint= 42, "");
#else
  /*
   On most platforms we get SIGSEGV == 11, but SIGBUS == 10 is also possible.
   And on Mac OsX we can get SIGILL == 4 (but only in optmized mode).
  */
  MY_EXPECT_DEATH_IF_SUPPORTED(*pint= 42, ".* UTC - mysqld got signal .*");
#endif
}


// A simple helper function to determine array size.
template <class T, int size>
int array_size(const T (&)[size])
{
  return size;
}


// Verifies that my_safe_utoa behaves like sprintf(_, "%llu", _)
TEST(PrintUtilities, Utoa)
{
  char buff[22];
  ulonglong intarr[]= { 0, 1, 8, 12, 1234, 88888, ULONG_MAX, ULLONG_MAX };
  char sprintbuff[22];
  for (int ix= 0; ix < array_size(intarr); ++ix)
  {
    char *my_res;
    sprintf(sprintbuff, "%llu", intarr[ix]);
    my_res= my_safe_utoa(10, intarr[ix], &buff[sizeof(buff)-1]);
    EXPECT_STREQ(sprintbuff, my_res);

    if (intarr[ix] <= ULONG_MAX)
    {
      sprintf(sprintbuff, "%lu", (ulong) intarr[ix]);
      my_res= my_safe_utoa(10, (ulong) intarr[ix], &buff[sizeof(buff)-1]);
      EXPECT_STREQ(sprintbuff, my_res);
    }
  }
}


// Verifies that my_safe_itoa behaves like sprintf(_, "%lld", _)
TEST(PrintUtilities, Itoa)
{
  char buff[22];
  char sprintbuff[22];
  longlong intarr[]= { 0, 1, 8, 12, 1234, 88888, LONG_MAX, LLONG_MAX };

  for (int ix= 0; ix < array_size(intarr); ++ix)
  {
    char *my_res;
    sprintf(sprintbuff, "%lld", intarr[ix]);
    my_res= my_safe_itoa(10, intarr[ix], &buff[sizeof(buff)-1]);
    EXPECT_STREQ(sprintbuff, my_res);

    ll2str(intarr[ix], buff, 10, 0);
    EXPECT_STREQ(sprintbuff, buff);

    sprintf(sprintbuff, "%lld", -intarr[ix]);
    my_res= my_safe_itoa(10, -intarr[ix], &buff[sizeof(buff)-1]);
    EXPECT_STREQ(sprintbuff, my_res);

    // This one fails ....
    // ll2str(-intarr[ix], buff, 10, 0);
    // EXPECT_STREQ(sprintbuff, buff)
    //  << "failed for " << -intarr[ix];

    sprintf(sprintbuff, "%llx", intarr[ix]);
    my_res= my_safe_itoa(16, intarr[ix], &buff[sizeof(buff)-1]);
    EXPECT_STREQ(sprintbuff, my_res);

    ll2str(intarr[ix], buff, 16, 0);
    EXPECT_STREQ(sprintbuff, buff);

    sprintf(sprintbuff, "%llx", -intarr[ix]);
    my_res= my_safe_itoa(16, -intarr[ix], &buff[sizeof(buff)-1]);
    EXPECT_STREQ(sprintbuff, my_res)
      << "failed for " << -intarr[ix];

    ll2str(-intarr[ix], buff, 16, 0);
    EXPECT_STREQ(sprintbuff, buff);
  }
}


// Various tests for my_safe_snprintf.
TEST(PrintUtilities, Printf)
{
  char buff[512];
  char sprintfbuff[512];
  const char *null_str= NULL;

  my_safe_snprintf(buff, sizeof(buff), "hello");
  EXPECT_STREQ("hello", buff);

  my_safe_snprintf(buff, sizeof(buff), "hello %s hello", "hello");
  EXPECT_STREQ("hello hello hello", buff);
  my_safe_snprintf(buff, sizeof(buff), "hello %s hello", null_str);
  EXPECT_STREQ("hello (null) hello", buff);

  my_safe_snprintf(buff, sizeof(buff), "hello %d hello", 42);
  EXPECT_STREQ("hello 42 hello", buff);
  my_safe_snprintf(buff, sizeof(buff), "hello %i hello", 42);
  EXPECT_STREQ("hello 42 hello", buff);
  my_safe_snprintf(buff, sizeof(buff), "hello %u hello", (unsigned) 42);
  EXPECT_STREQ("hello 42 hello", buff);

  my_safe_snprintf(buff, sizeof(buff), "hello %llu hello", ULLONG_MAX);
  sprintf(sprintfbuff, "hello %llu hello", ULLONG_MAX);
  EXPECT_STREQ(sprintfbuff, buff);

  my_safe_snprintf(buff, sizeof(buff), "hello %x hello", 42);
  EXPECT_STREQ("hello 2a hello", buff);

  my_safe_snprintf(buff, sizeof(buff), "hello %x hello", -42);
  sprintf(sprintfbuff, "hello %x hello", -42);
  EXPECT_STREQ("hello ffffffd6 hello", buff);
  EXPECT_STREQ(sprintfbuff, buff);

  my_safe_snprintf(buff, sizeof(buff), "hello %llx hello", (longlong) -42);
  sprintf(sprintfbuff, "hello %llx hello", (longlong) -42);
  EXPECT_STREQ("hello ffffffffffffffd6 hello", buff);
  EXPECT_STREQ(sprintfbuff, buff);

  void *p= this;
  my_safe_snprintf(buff, sizeof(buff), "hello 0x%p hello", p);
  my_snprintf(sprintfbuff, sizeof(sprintfbuff), "hello %p hello", p);
  EXPECT_STREQ(sprintfbuff, buff) << "my_safe_snprintf:" << buff;
}


// After the fix for Bug#14689561, this is no longer a death test.
TEST(HashFiloTest, TestHashFiloZeroSize)
{
  hash_filo *t_cache;
  t_cache= new hash_filo(PSI_NOT_INSTRUMENTED,
                         5, 0, 0,
                         (my_hash_get_key) NULL,
                         (my_hash_free_key) NULL,
                         NULL);
  t_cache->clear();
  t_cache->resize(0);
  hash_filo_element entry;
  // After resize (to zero) it tries to dereference last_link which is NULL.
  t_cache->add(&entry);
  delete t_cache;
}

}