Merging of changes from myisam -> maria missing in last 5.1 - 5.1->maria merge

MARIA_MAX_MSG_BUF -> HA_MAX_MSG_BUF

include/maria.h:
  Remove MARIA_MAX_MSG_BUF; We are now using HA_MAX_MSG_BUF
  Added maria_test_invalid_symlink
storage/maria/ha_maria.cc:
  MARIA_MAX_MSG_BUF -> HA_MAX_MSG_BUF
storage/maria/ma_check.c:
  Removed tab in string constant
  Add extra argument to ma_open_datafile()
storage/maria/ma_create.c:
  Set error number if table is in use
storage/maria/ma_open.c:
  Added name argument to open functions for security check if filename is linked to another file in database directory
storage/maria/ma_static.c:
  Default functions for checking if wrong symlink
storage/maria/maria_chk.c:
  Add extra argument to _ma_open_datafile()
storage/maria/maria_def.h:
  Add extra argument to _ma_open_datafile()

include/maria.h

@@ -43,7 +43,6 @@ extern "C" {
 #define MARIA_MAX_KEY    MAX_INDEXES            /* Max allowed keys */
 #endif
 
-#define MARIA_MAX_MSG_BUF      1024 /* used in CHECK TABLE, REPAIR TABLE */
 #define MARIA_NAME_IEXT	".MAI"
 #define MARIA_NAME_DEXT	".MAD"
 /* Max extra space to use when sorting keys */
@@ -273,6 +272,12 @@ extern my_off_t maria_max_temp_length;
 extern ulong maria_bulk_insert_tree_size, maria_data_pointer_size;
 extern PAGECACHE maria_pagecache_var, *maria_pagecache;
 extern MY_TMPDIR *maria_tmpdir;
+/*
+  This is used to check if a symlink points into the mysql data home,
+  which is normally forbidden as it can be used to get access to
+  not privileged data
+*/
+extern int (*maria_test_invalid_symlink)(const char *filename);
 
 	/* Prototypes for maria-functions */
 

storage/maria/ha_maria.cc

@@ -241,7 +241,7 @@ static void _ma_check_print_msg(HA_CHECK *param, const char *msg_type,
   THD *thd= (THD *) param->thd;
   Protocol *protocol= thd->protocol;
   uint length, msg_length;
-  char msgbuf[MARIA_MAX_MSG_BUF];
+  char msgbuf[HA_MAX_MSG_BUF];
   char name[NAME_LEN * 2 + 2];
 
   msg_length= my_vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
@@ -3097,6 +3097,11 @@ static int ha_maria_init(void *p)
     ((force_start_after_recovery_failures != 0) && mark_recovery_success()) ||
     ma_checkpoint_init(checkpoint_interval);
   maria_multi_threaded= maria_in_ha_maria= TRUE;
+
+#if defined(HAVE_REALPATH) && !defined(HAVE_purify) && !defined(HAVE_BROKEN_REALPATH)
+  /*  We can only test for sub paths if my_symlink.c is using realpath */
+  maria_test_invalid_symlink= test_if_data_home_dir;
+#endif
   return res ? HA_ERR_INITIALIZATION : 0;
 }
 

storage/maria/ma_check.c

@@ -2097,14 +2097,14 @@ int maria_chk_data_link(HA_CHECK *param, MARIA_HA *info, my_bool extend)
     if (param->del_blocks != share->state.state.del)
     {
       _ma_check_print_warning(param,
-                              "Found %10s deleted blocks       Should be: %s",
+                              "Found %10s deleted blocks.  Should be: %s",
                               llstr(param->del_blocks,llbuff),
                               llstr(share->state.state.del,llbuff2));
     }
     if (param->splits != share->state.split)
     {
       _ma_check_print_warning(param,
-                              "Found %10s parts                Should be: %s parts",
+                              "Found %10s key parts.  Should be: %s",
                               llstr(param->splits, llbuff),
                               llstr(share->state.split,llbuff2));
     }
@@ -2685,7 +2685,7 @@ int maria_repair(HA_CHECK *param, register MARIA_HA *info,
                                 (param->testflag & T_BACKUP_DATA ?
                                  MYF(MY_REDEL_MAKE_BACKUP): MYF(0)) |
                                 sync_dir) ||
-        _ma_open_datafile(info, share, -1))
+        _ma_open_datafile(info, share, NullS, -1))
     {
       goto err;
     }
@@ -3794,7 +3794,7 @@ int maria_repair_by_sort(HA_CHECK *param, register MARIA_HA *info,
                                   (param->testflag & T_BACKUP_DATA ?
                                    MYF(MY_REDEL_MAKE_BACKUP): MYF(0)) |
                                   sync_dir) ||
-          _ma_open_datafile(info, share, -1))
+          _ma_open_datafile(info, share, NullS, -1))
       {
         _ma_check_print_error(param, "Couldn't change to new data file");
         goto err;
@@ -4402,7 +4402,7 @@ err:
                                   MYF((param->testflag & T_BACKUP_DATA ?
                                        MY_REDEL_MAKE_BACKUP : 0) |
                                       sync_dir)) ||
-	  _ma_open_datafile(info,share,-1))
+	  _ma_open_datafile(info,share, NullS, -1))
 	got_error=1;
     }
   }

storage/maria/ma_create.c

@@ -836,6 +836,7 @@ int maria_create(const char *name, enum data_file_type datafile_type,
     my_printf_error(0, "MARIA table '%s' is in use "
                     "(most likely by a MERGE table). Try FLUSH TABLES.",
                     MYF(0), name + dirname_length(name));
+    my_errno= HA_ERR_TABLE_EXIST;
     goto err;
   }
 

storage/maria/ma_open.c

@@ -85,8 +85,8 @@ MARIA_HA *_ma_test_if_reopen(const char *filename)
 */
 
 
-static MARIA_HA *maria_clone_internal(MARIA_SHARE *share, int mode,
-                                      File data_file)
+static MARIA_HA *maria_clone_internal(MARIA_SHARE *share, const char *name,
+                                      int mode, File data_file)
 {
   int save_errno;
   uint errpos;
@@ -104,7 +104,7 @@ static MARIA_HA *maria_clone_internal(MARIA_SHARE *share, int mode,
   }
   if (data_file >= 0)
     info.dfile.file= data_file;
-  else if (_ma_open_datafile(&info, share, -1))
+  else if (_ma_open_datafile(&info, share, name, -1))
     goto err;
   errpos= 5;
 
@@ -236,7 +236,7 @@ MARIA_HA *maria_clone(MARIA_SHARE *share, int mode)
 {
   MARIA_HA *new_info;
   pthread_mutex_lock(&THR_LOCK_maria);
-  new_info= maria_clone_internal(share, mode,
+  new_info= maria_clone_internal(share, NullS, mode,
                                  share->data_file_type == BLOCK_RECORD ?
                                  share->bitmap.file.file : -1);
   pthread_mutex_unlock(&THR_LOCK_maria);
@@ -256,7 +256,7 @@ MARIA_HA *maria_clone(MARIA_SHARE *share, int mode)
 MARIA_HA *maria_open(const char *name, int mode, uint open_flags)
 {
   int kfile,open_mode,save_errno;
-  uint i,j,len,errpos,head_length,base_pos,info_length,keys,
+  uint i,j,len,errpos,head_length,base_pos,info_length,keys, realpath_err,
     key_parts,unique_key_parts,fulltext_keys,uniques;
   char name_buff[FN_REFLEN], org_name[FN_REFLEN], index_name[FN_REFLEN],
        data_name[FN_REFLEN];
@@ -277,8 +277,16 @@ MARIA_HA *maria_open(const char *name, int mode, uint open_flags)
   head_length=sizeof(share_buff.state.header);
   bzero((uchar*) &info,sizeof(info));
 
-  my_realpath(name_buff, fn_format(org_name,name,"",MARIA_NAME_IEXT,
+  realpath_err= my_realpath(name_buff, fn_format(org_name, name, "",
+                                                 MARIA_NAME_IEXT,
                                                  MY_UNPACK_FILENAME),MYF(0));
+  if (my_is_symlink(org_name) &&
+      (realpath_err || (*maria_test_invalid_symlink)(name_buff)))
+  {
+    my_errno= HA_WRONG_CREATE_OPTION;
+    DBUG_RETURN(0);
+  }
+
   pthread_mutex_lock(&THR_LOCK_maria);
   old_info= 0;
   if ((open_flags & HA_OPEN_COPY) ||
@@ -347,7 +355,7 @@ MARIA_HA *maria_open(const char *name, int mode, uint open_flags)
     if (!strcmp(name_buff, org_name) ||
         my_readlink(index_name, org_name, MYF(0)) == -1)
       (void) strmov(index_name, org_name);
-    *strrchr(org_name, '.')= '\0';
+    *strrchr(org_name, FN_EXTCHAR)= '\0';
     (void) fn_format(data_name,org_name,"",MARIA_NAME_DEXT,
                      MY_APPEND_EXT|MY_UNPACK_FILENAME|MY_RESOLVE_SYMLINKS);
 
@@ -739,7 +747,7 @@ MARIA_HA *maria_open(const char *name, int mode, uint open_flags)
     if ((share->data_file_type == BLOCK_RECORD ||
          share->data_file_type == COMPRESSED_RECORD))
     {
-      if (_ma_open_datafile(&info, share, -1))
+      if (_ma_open_datafile(&info, share, name, -1))
         goto err;
       data_file= info.dfile.file;
     }
@@ -884,7 +892,7 @@ MARIA_HA *maria_open(const char *name, int mode, uint open_flags)
       data_file= share->bitmap.file.file;       /* Only opened once */
   }
 
-  if (!(m_info= maria_clone_internal(share, mode, data_file)))
+  if (!(m_info= maria_clone_internal(share, name, mode, data_file)))
     goto err;
 
   pthread_mutex_unlock(&THR_LOCK_maria);
@@ -1729,9 +1737,27 @@ void _ma_set_index_pagecache_callbacks(PAGECACHE_FILE *file,
   exist a dup()-like call that would give us two different file descriptors.
 *************************************************************************/
 
-int _ma_open_datafile(MARIA_HA *info, MARIA_SHARE *share,
+int _ma_open_datafile(MARIA_HA *info, MARIA_SHARE *share, const char *org_name,
                       File file_to_dup __attribute__((unused)))
 {
+  char *data_name= share->data_file_name.str;
+  char real_data_name[FN_REFLEN];
+
+  if (org_name)
+  {
+    fn_format(real_data_name, org_name, "", MARIA_NAME_DEXT, 4);
+    if (my_is_symlink(real_data_name))
+    {
+      if (my_realpath(real_data_name, real_data_name, MYF(0)) ||
+          (*maria_test_invalid_symlink)(real_data_name))
+      {
+        my_errno= HA_WRONG_CREATE_OPTION;
+        return 1;
+      }
+      data_name= real_data_name;
+    }
+  }
+
   info->dfile.file= share->bitmap.file.file=
     my_open(share->data_file_name.str, share->mode | O_SHARE,
             MYF(MY_WME));

storage/maria/ma_static.c

@@ -13,6 +13,15 @@
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
 
+
+static int always_valid(const char *filename __attribute__((unused)))
+{
+  return 0;
+}
+
+int (*maria_test_invalid_symlink)(const char *filename)= always_valid;
+
+
 /*
   Static variables for MARIA library. All definied here for easy making of
   a shared library

storage/maria/maria_chk.c

@@ -1189,7 +1189,7 @@ static int maria_chk(HA_CHECK *param, char *filename)
         VOID(my_close(info->dfile.file, MYF(MY_WME))); /* Close new file */
         error|=maria_change_to_newfile(filename,MARIA_NAME_DEXT,DATA_TMP_EXT,
                                        MYF(0));
-        if (_ma_open_datafile(info,info->s, -1))
+        if (_ma_open_datafile(info,info->s, NullS, -1))
           error=1;
         param->out_flag&= ~O_NEW_DATA; /* We are using new datafile */
         param->read_cache.file= info->dfile.file;

storage/maria/maria_def.h

@@ -1100,7 +1100,8 @@ void _ma_def_scan_restore_pos(MARIA_HA *info, MARIA_RECORD_POS lastpos);
 
 extern MARIA_HA *_ma_test_if_reopen(const char *filename);
 my_bool _ma_check_table_is_closed(const char *name, const char *where);
-int _ma_open_datafile(MARIA_HA *info, MARIA_SHARE *share, File file_to_dup);
+int _ma_open_datafile(MARIA_HA *info, MARIA_SHARE *share, const char *org_name,
+                      File file_to_dup);
 int _ma_open_keyfile(MARIA_SHARE *share);
 void _ma_setup_functions(register MARIA_SHARE *share);
 my_bool _ma_dynmap_file(MARIA_HA *info, my_off_t size);