__gcov_flush was never an external symbol in the documentation.
It was removed in gcc-11. The correct function to use is __gcov_dump
which is defined in the gcov.h header.
The MariaDB code base uses strcat() and strcpy() in several
places. These are known to have memory safety issues and their usage is
discouraged. Common security scanners like Flawfinder flags them. In MariaDB we
should start using modern and safer variants on these functions.
This is similar to memory issues fixes in 19af1890b5
and 9de9f105b5 but now replace use of strcat()
and strcpy() with safer options strncat() and strncpy().
However, add '\0' forcefully to make sure the result string is correct since
for these two functions it is not guaranteed what new string will be null-terminated.
Example:
size_t dest_len = sizeof(g->Message);
strncpy(g->Message, "Null json tree", dest_len); strncat(g->Message, ":",
sizeof(g->Message) - strlen(g->Message)); size_t wrote_sz = strlen(g->Message);
size_t cur_len = wrote_sz >= dest_len ? dest_len - 1 : wrote_sz;
g->Message[cur_len] = '\0';
All new code of the whole pull request, including one or several files
that are either new files or modified ones, are contributed under the BSD-new
license. I am contributing on behalf of my employer Amazon Web Services
-- Reviewer and co-author Vicențiu Ciorbaru <vicentiu@mariadb.org>
-- Reviewer additions:
* The initial function implementation was flawed. Replaced with a simpler
and also correct version.
* Simplified code by making use of snprintf instead of chaining strcat.
* Simplified code by removing dynamic string construction in the first
place and using static strings if possible. See connect storage engine
changes.
DBUG_PUSH_EMPTY is used by thr_mutex.cc.
If there are 4G of DBUG_PUSH_EMPTY calls, then DBUG_POP_EMPTY will
cause a crash when DBUGCloseFile() will try to free an object that
was never allocated.
This fixed the MySQL bug# 20338 about misuse of double underscore
prefix __WIN__, which was old MySQL's idea of identifying Windows
Replace it by _WIN32 standard symbol for targeting Windows OS
(both 32 and 64 bit)
Not that connect storage engine is not fixed in this patch (must be
fixed in "upstream" branch)
Deadlock in DbugParse, on Linux.
In 10.1, DBUG recursive mutex was improperly implemented.
CODE_STATE::locked counter was never updated.
Copy the code around LockMutex/UnlockMutex from 10.2
FreeState(): replace pointer to freed memory with NULL. This actually fixes a crash
which is use-after-free as reported by ASAN
DbugParse(): unconditionally lock mutex because we're touching shared init_settings.keywords
DbugParse(): removed mutex lock/unlock which should protect file writes only.
And no file writes happen in this function.
DbugFlush(): move mutex_unlock out of this method because fflush() doesn't
need any locking.
Slow stuff like mutex lock/unlock and accessing errno (TLS)
is moved to a more narrow scope.
MYSQL_PLUGIN_IMPORT did not work correctly for the RocksDB helper library
rocksdb_aux_lib, because that library was not compiled with
-DMYSQL_DYNAMIC_PLUGIN.
Fix DBUG such that it does not depend on exported data, only on functions
(which do not need MYSQL_PLUGIN_IMPORT decoration)
Use a "getter" function _db_my_assert() instead of DLL-exported variable.
Also, reduce object code duplication by moving more of the DBUG_ASSERT
logic inside the _db_my_assert() function, and add unlikely() and
ATTRIBUTE_COLD hints to ensure that the 'assertion failed' code will
be separated from the main control flow logic. Thus, the compiler can
move the unlikely() code to the end of the compiled function, reachable
via a forward conditional branch, which the processor's branch predictor
could assume 'not taken'.
- Fix win64 pointer truncation warnings
(usually coming from misusing 0x%lx and long cast in DBUG)
- Also fix printf-format warnings
Make the above mentioned warnings fatal.
- fix pthread_join on Windows to set return value.
If compiling a non DBUG binary with
-DDBUG_ASSERT_AS_PRINTF asserts will be
changed to printf + stack trace (of stack
trace are enabled).
- Changed #ifndef DBUG_OFF to
#ifdef DBUG_ASSERT_EXISTS
for those DBUG_OFF that was just used to enable
assert
- Assert checking that could greatly impact
performance where changed to DBUG_ASSERT_SLOW which
is not affected by DBUG_ASSERT_AS_PRINTF
- Added one extra option to my_print_stacktrace() to
get more silent in case of stack trace printing as
part of assert.
Define my_thread_id as an unsigned type, to avoid mismatch with
ulonglong. Change some parameters to this type.
Use size_t in a few more places.
Declare many flag constants as unsigned to avoid sign mismatch
when shifting bits or applying the unary ~ operator.
When applying the unary ~ operator to enum constants, explictly
cast the result to an unsigned type, because enum constants can
be treated as signed.
In InnoDB, change the source code line number parameters from
ulint to unsigned type. Also, make some InnoDB functions return
a narrower type (unsigned or uint32_t instead of ulint;
bool instead of ibool).
MariaDB Server is unnecessarily evaluating the arguments of
DBUG_PRINT() macros when the label is not defined.
The macro DBUG_LOG() for C++ operator<< output which was added for
InnoDB diagnostics in MySQL 5.7 is missing from MariaDB. Unlike the
MySQL 5.7 implementation, MariaDB will avoid allocating and
initializing the output string when the label is not defined.
Introduce DBUG_OUT("crypt") and DBUG_OUT("checksum") for some InnoDB
diagnostics, replacing some use of ib::info().
when func1 calls func2 from DBUG_RETURN, dbug shows the trace as
| > func1
| < func1
| > func2
| < func2
because DBUG_LEAVE happens before func2(). Change that to invoke
DBUG_LEAVE when the local variable goes out of scope. This uses
gcc specific __attribute__((cleanup)).
- Reset static variables that are used to signal "init done" for DBUG, in dbug_end()
- Set string server variables to NULL after memory for the value is freed - avoids double free()
- fix DBUG_ASSERTs that happened during reinitialization.
client/mysqldump.c:
Slave needs to be initialized with 0
dbug/dbug.c:
Removed not existing function
plugin/semisync/semisync_master.cc:
Fixed compiler warning
sql/opt_range.cc:
thd needs to be set early as it's used in some error conditions.
sql/sql_table.cc:
Changed to use uchar* to make array indexing portable
storage/innobase/handler/ha_innodb.cc:
Removed not used variable
storage/maria/ma_delete.c:
Fixed compiler warning
storage/maria/ma_write.c:
Fixed compiler warning
