1# 2008 June 11 2# 3# The author disclaims copyright to this source code. In place of 4# a legal notice, here is a blessing: 5# 6# May you do good and not evil. 7# May you find forgiveness for yourself and forgive others. 8# May you share freely, never taking more than you give. 9# 10#*********************************************************************** 11# This file implements regression tests for SQLite library. 12# 13# This file implements tests to make sure SQLite does not crash or 14# segfault if it sees a corrupt database file. It specifically focuses 15# on corrupt cell offsets in a btree page. 16# 17# $Id: corrupt7.test,v 1.5 2008/08/13 14:07:41 drh Exp $ 18 19set testdir [file dirname $argv0] 20source $testdir/tester.tcl 21 22# We must have the page_size pragma for these tests to work. 23# 24ifcapable !pager_pragmas { 25 finish_test 26 return 27} 28 29# Create a simple, small database. 30# 31do_test corrupt7-1.1 { 32 execsql { 33 PRAGMA auto_vacuum=OFF; 34 PRAGMA page_size=1024; 35 CREATE TABLE t1(x); 36 INSERT INTO t1(x) VALUES(1); 37 INSERT INTO t1(x) VALUES(2); 38 INSERT INTO t1(x) SELECT x+2 FROM t1; 39 INSERT INTO t1(x) SELECT x+4 FROM t1; 40 INSERT INTO t1(x) SELECT x+8 FROM t1; 41 } 42 file size test.db 43} [expr {1024*2}] 44 45# Verify that the file format is as we expect. The page size 46# should be 1024 bytes. 47# 48do_test corrupt7-1.2 { 49 hexio_get_int [hexio_read test.db 16 2] 50} 1024 ;# The page size is 1024 51do_test corrupt7-1.3 { 52 hexio_get_int [hexio_read test.db 20 1] 53} 0 ;# Unused bytes per page is 0 54 55integrity_check corrupt7-1.4 56 57# Deliberately corrupt some of the cell offsets in the btree page 58# on page 2 of the database. 59# 60do_test corrupt7-2.1 { 61 db close 62 hexio_write test.db 1062 FF 63 sqlite3 db test.db 64 db eval {PRAGMA integrity_check(1)} 65} {{*** in database main *** 66Corruption detected in cell 15 on page 2}} 67do_test corrupt7-2.2 { 68 db close 69 hexio_write test.db 1062 04 70 sqlite3 db test.db 71 db eval {PRAGMA integrity_check(1)} 72} {{*** in database main *** 73Corruption detected in cell 15 on page 2}} 74 75# The code path that was causing the buffer overrun that this test 76# case was checking for was removed. 77# 78#do_test corrupt7-3.1 { 79# execsql { 80# DROP TABLE t1; 81# CREATE TABLE t1(a, b); 82# INSERT INTO t1 VALUES(1, 'one'); 83# INSERT INTO t1 VALUES(100, 'one hundred'); 84# INSERT INTO t1 VALUES(100000, 'one hundred thousand'); 85# CREATE INDEX i1 ON t1(b); 86# } 87# db close 88# 89# # Locate the 3rd cell in the index. 90# set cell_offset [hexio_get_int [hexio_read test.db [expr 1024*2 + 12] 2]] 91# incr cell_offset [expr 1024*2] 92# incr cell_offset 1 93# 94# # This write corrupts the "header-size" field of the database record 95# # stored in the index cell. At one point this was causing sqlite to 96# # reference invalid memory. 97# hexio_write test.db $cell_offset FFFF7F 98# 99# sqlite3 db test.db 100# catchsql { 101# SELECT b FROM t1 WHERE b > 'o' AND b < 'p'; 102# } 103#} {1 {database disk image is malformed}} 104 105finish_test 106