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Fix for bug #18113 "SELECT * FROM information_schema.xxx crashes server"

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Crash happened when one selected data from one of INFORMATION_SCHEMA
tables and in order to build its contents server had to open view which
used stored function and table or view on which one had not global or
database-level privileges (e.g. had only table-level or had no
privileges at all).

The crash was caused by usage of check_grant() function, which assumes
that either number of tables to be inspected by it is limited explicitly
or table list used and thd->lex->query_tables_own_last value correspond
to each other (the latter should be either 0 or point to next_global
member of one of elements of this table list), in conditions when
above assumptions were not true. This fix just explicitly limits
number of tables to be inspected. Other negative effects which are
caused by the fact that thd->lex->query_tables_own_last might not
be set properly during processing of I_S tables are less disastrous
and will be reported and fixed separetely.



mysql-test/r/information_schema_db.result:
  Fix for bug #18113 "SELECT * FROM information_schema.xxx crashes server"
    test case
mysql-test/t/information_schema_db.test:
  Fix for bug #18113 "SELECT * FROM information_schema.xxx crashes server"
    test case
sql/sql_acl.cc:
    added note
This commit is contained in:
unknown
2006-03-20 13:42:02 +04:00
parent c560a5b1d4
commit ce39d29493
4 changed files with 53 additions and 1 deletions
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7
sql/sql_acl.cc
View File

@@ -3537,6 +3537,13 @@ end:
RETURN
0 ok
1 Error: User did not have the requested privileges
NOTE
This functions assumes that either number of tables to be inspected
by it is limited explicitly (i.e. is is not UINT_MAX) or table list
used and thd->lex->query_tables_own_last value correspond to each
other (the latter should be either 0 or point to next_global member
of one of elements of this table list).
****************************************************************************/
bool check_grant(THD *thd, ulong want_access, TABLE_LIST *tables,