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Merge dl145h.mysql.com:/data0/mkindahl/mysql-5.0-rpl-merge 

into  dl145h.mysql.com:/data0/mkindahl/mysql-5.1-rpl-merge
pull/73/head
mkindahl@dl145h.mysql.com 18 years ago
parent
d7f570c056 379b67b967
commit
60fa29c847
4 changed files with 122 additions and 13 deletions
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  1. 1
      mysql-test/r/mysqlbinlog.result
  2. BIN
      mysql-test/std_data/corrupt-relay-bin.000624
  3. 4
      mysql-test/t/mysqlbinlog.test
  4. 130
      sql/log_event.cc

1
mysql-test/r/mysqlbinlog.result
View File

@ -326,6 +326,7 @@ flush logs;
drop table t1;
1
drop table t1;
shell> mysqlbinlog std_data/corrupt-relay-bin.000624 > var/tmp/bug31793.sql
End of 5.0 tests
flush logs;
BUG#31611: Security risk with BINLOG statement

BIN
mysql-test/std_data/corrupt-relay-bin.000624
View File

4
mysql-test/t/mysqlbinlog.test
View File

@ -240,6 +240,10 @@ let $c= `select $a=$b`;
--echo $c
drop table t1;
echo shell> mysqlbinlog std_data/corrupt-relay-bin.000624 > var/tmp/bug31793.sql;
error 1;
exec $MYSQL_BINLOG $MYSQL_TEST_DIR/std_data/corrupt-relay-bin.000624 > $MYSQLTEST_VARDIR/tmp/bug31793.sql;
--echo End of 5.0 tests
#

130
sql/log_event.cc
View File

@ -1661,18 +1661,48 @@ Query_log_event::Query_log_event(THD* thd_arg, const char* query_arg,
/* 2 utility functions for the next method */
/*
Get the pointer for a string (src) that contains the length in
the first byte. Set the output string (dst) to the string value
and place the length of the string in the byte after the string.
/**
Read a string with length from memory.
This function reads the string-with-length stored at
<code>src</code> and extract the length into <code>*len</code> and
a pointer to the start of the string into <code>*dst</code>. The
string can then be copied using <code>memcpy()</code> with the
number of bytes given in <code>*len</code>.
@param src Pointer to variable holding a pointer to the memory to
read the string from.
@param dst Pointer to variable holding a pointer where the actual
string starts. Starting from this position, the string
can be copied using @c memcpy().
@param len Pointer to variable where the length will be stored.
@param end One-past-the-end of the memory where the string is
stored.
@return Zero if the entire string can be copied successfully,
@c UINT_MAX if the length could not be read from memory
(that is, if <code>*src >= end</code>), otherwise the
number of bytes that are missing to read the full
string, which happends <code>*dst + *len >= end</code>.
*/
static void get_str_len_and_pointer(const Log_event::Byte **src,
const char **dst,
uint *len)
{
if ((*len= **src))
*dst= (char *)*src + 1; // Will be copied later
(*src)+= *len + 1;
static int
get_str_len_and_pointer(const Log_event::Byte **src,
const char **dst,
uint *len,
const Log_event::Byte *end)
{
if (*src >= end)
return -1; // Will be UINT_MAX in two-complement arithmetics
uint length= **src;
if (length > 0)
{
if (*src + length >= end)
return *src + length - end + 1; // Number of bytes missing
*dst= (char *)*src + 1; // Will be copied later
}
*len= length;
*src+= length + 1;
return 0;
}
static void copy_str_and_move(const char **src,
@ -1685,6 +1715,46 @@ static void copy_str_and_move(const char **src,
*(*dst)++= 0;
}
#ifndef DBUG_OFF
static char const *
code_name(int code)
{
static char buf[255];
switch (code) {
case Q_FLAGS2_CODE: return "Q_FLAGS2_CODE";
case Q_SQL_MODE_CODE: return "Q_SQL_MODE_CODE";
case Q_CATALOG_CODE: return "Q_CATALOG_CODE";
case Q_AUTO_INCREMENT: return "Q_AUTO_INCREMENT";
case Q_CHARSET_CODE: return "Q_CHARSET_CODE";
case Q_TIME_ZONE_CODE: return "Q_TIME_ZONE_CODE";
case Q_CATALOG_NZ_CODE: return "Q_CATALOG_NZ_CODE";
case Q_LC_TIME_NAMES_CODE: return "Q_LC_TIME_NAMES_CODE";
case Q_CHARSET_DATABASE_CODE: return "Q_CHARSET_DATABASE_CODE";
}
sprintf(buf, "CODE#%d", code);
return buf;
}
#endif
/**
Macro to check that there is enough space to read from memory.
@param PTR Pointer to memory
@param END End of memory
@param CNT Number of bytes that should be read.
*/
#define CHECK_SPACE(PTR,END,CNT) \
do { \
DBUG_PRINT("info", ("Read %s", code_name(pos[-1]))); \
DBUG_ASSERT((PTR) + (CNT) <= (END)); \
if ((PTR) + (CNT) > (END)) { \
DBUG_PRINT("info", ("query= 0")); \
query= 0; \
DBUG_VOID_RETURN; \
} \
} while (0)
/*
Query_log_event::Query_log_event()
This is used by the SQL slave thread to prepare the event before execution.
@ -1737,6 +1807,19 @@ Query_log_event::Query_log_event(const char* buf, uint event_len,
if (tmp)
{
status_vars_len= uint2korr(buf + Q_STATUS_VARS_LEN_OFFSET);
/*
Check if status variable length is corrupt and will lead to very
wrong data. We could be even more strict and require data_len to
be even bigger, but this will suffice to catch most corruption
errors that can lead to a crash.
*/
if (status_vars_len > min(data_len, MAX_SIZE_LOG_EVENT_STATUS))
{
DBUG_PRINT("info", ("status_vars_len (%u) > data_len (%lu); query= 0",
status_vars_len, data_len));
query= 0;
DBUG_VOID_RETURN;
}
data_len-= status_vars_len;
DBUG_PRINT("info", ("Query_log_event has status_vars_len: %u",
(uint) status_vars_len));
@ -1756,6 +1839,7 @@ Query_log_event::Query_log_event(const char* buf, uint event_len,
{
switch (*pos++) {
case Q_FLAGS2_CODE:
CHECK_SPACE(pos, end, 4);
flags2_inited= 1;
flags2= uint4korr(pos);
DBUG_PRINT("info",("In Query_log_event, read flags2: %lu", (ulong) flags2));
@ -1766,6 +1850,7 @@ Query_log_event::Query_log_event(const char* buf, uint event_len,
#ifndef DBUG_OFF
char buff[22];
#endif
CHECK_SPACE(pos, end, 8);
sql_mode_inited= 1;
sql_mode= (ulong) uint8korr(pos); // QQ: Fix when sql_mode is ulonglong
DBUG_PRINT("info",("In Query_log_event, read sql_mode: %s",
@ -1774,15 +1859,24 @@ Query_log_event::Query_log_event(const char* buf, uint event_len,
break;
}
case Q_CATALOG_NZ_CODE:
get_str_len_and_pointer(&pos, &catalog, &catalog_len);
DBUG_PRINT("info", ("case Q_CATALOG_NZ_CODE; pos: 0x%lx; end: 0x%lx",
(ulong) pos, (ulong) end));
if (get_str_len_and_pointer(&pos, &catalog, &catalog_len, end))
{
DBUG_PRINT("info", ("query= 0"));
query= 0;
DBUG_VOID_RETURN;
}
break;
case Q_AUTO_INCREMENT:
CHECK_SPACE(pos, end, 4);
auto_increment_increment= uint2korr(pos);
auto_increment_offset= uint2korr(pos+2);
pos+= 4;
break;
case Q_CHARSET_CODE:
{
CHECK_SPACE(pos, end, 6);
charset_inited= 1;
memcpy(charset, pos, 6);
pos+= 6;
@ -1790,20 +1884,29 @@ Query_log_event::Query_log_event(const char* buf, uint event_len,
}
case Q_TIME_ZONE_CODE:
{
get_str_len_and_pointer(&pos, &time_zone_str, &time_zone_len);
if (get_str_len_and_pointer(&pos, &time_zone_str, &time_zone_len, end))
{
DBUG_PRINT("info", ("Q_TIME_ZONE_CODE: query= 0"));
query= 0;
DBUG_VOID_RETURN;
}
break;
}
case Q_CATALOG_CODE: /* for 5.0.x where 0<=x<=3 masters */
CHECK_SPACE(pos, end, 1);
if ((catalog_len= *pos))
catalog= (char*) pos+1; // Will be copied later
CHECK_SPACE(pos, end, catalog_len + 2);
pos+= catalog_len+2; // leap over end 0
catalog_nz= 0; // catalog has end 0 in event
break;
case Q_LC_TIME_NAMES_CODE:
CHECK_SPACE(pos, end, 2);
lc_time_names_number= uint2korr(pos);
pos+= 2;
break;
case Q_CHARSET_DATABASE_CODE:
CHECK_SPACE(pos, end, 2);
charset_database_number= uint2korr(pos);
pos+= 2;
break;
@ -2317,6 +2420,7 @@ end:
*/
thd->catalog= 0;
thd->set_db(NULL, 0); /* will free the current database */
DBUG_PRINT("info", ("end: query= 0"));
thd->query= 0; // just to be sure
thd->query_length= 0;
VOID(pthread_mutex_unlock(&LOCK_thread_count));

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