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 1.8 2009/08/10 10:18:08 danielk1977 Exp $ 18 19set testdir [file dirname $argv0] 20source $testdir/tester.tcl 21 22# This module uses hard-coded offsets which do not work if the reserved_bytes 23# value is nonzero. 24if {[nonzero_reserved_bytes]} {finish_test; return;} 25 26# These tests deal with corrupt database files 27# 28database_may_be_corrupt 29 30# We must have the page_size pragma for these tests to work. 31# 32ifcapable !pager_pragmas { 33 finish_test 34 return 35} 36 37# Create a simple, small database. 38# 39do_test corrupt7-1.1 { 40 execsql { 41 PRAGMA auto_vacuum=OFF; 42 PRAGMA page_size=1024; 43 CREATE TABLE t1(x); 44 INSERT INTO t1(x) VALUES(1); 45 INSERT INTO t1(x) VALUES(2); 46 INSERT INTO t1(x) SELECT x+2 FROM t1; 47 INSERT INTO t1(x) SELECT x+4 FROM t1; 48 INSERT INTO t1(x) SELECT x+8 FROM t1; 49 } 50 file size test.db 51} [expr {1024*2}] 52 53# Verify that the file format is as we expect. The page size 54# should be 1024 bytes. 55# 56do_test corrupt7-1.2 { 57 hexio_get_int [hexio_read test.db 16 2] 58} 1024 ;# The page size is 1024 59do_test corrupt7-1.3 { 60 hexio_get_int [hexio_read test.db 20 1] 61} 0 ;# Unused bytes per page is 0 62 63integrity_check corrupt7-1.4 64 65# Deliberately corrupt some of the cell offsets in the btree page 66# on page 2 of the database. 67do_test corrupt7-2.1 { 68 db close 69 hexio_write test.db 1062 FF 70 sqlite3 db test.db 71 db eval {PRAGMA integrity_check(1)} 72} {{*** in database main *** 73On tree page 2 cell 15: Offset 65457 out of range 945..1020}} 74do_test corrupt7-2.2 { 75 db close 76 hexio_write test.db 1062 04 77 sqlite3 db test.db 78 db eval {PRAGMA integrity_check(1)} 79} {{*** in database main *** 80On tree page 2 cell 15: Offset 1201 out of range 945..1020}} 81 82# The code path that was causing the buffer overrun that this test 83# case was checking for was removed. 84# 85#do_test corrupt7-3.1 { 86# execsql { 87# DROP TABLE t1; 88# CREATE TABLE t1(a, b); 89# INSERT INTO t1 VALUES(1, 'one'); 90# INSERT INTO t1 VALUES(100, 'one hundred'); 91# INSERT INTO t1 VALUES(100000, 'one hundred thousand'); 92# CREATE INDEX i1 ON t1(b); 93# } 94# db close 95# 96# # Locate the 3rd cell in the index. 97# set cell_offset [hexio_get_int [hexio_read test.db [expr 1024*2 + 12] 2]] 98# incr cell_offset [expr 1024*2] 99# incr cell_offset 1 100# 101# # This write corrupts the "header-size" field of the database record 102# # stored in the index cell. At one point this was causing sqlite to 103# # reference invalid memory. 104# hexio_write test.db $cell_offset FFFF7F 105# 106# sqlite3 db test.db 107# catchsql { 108# SELECT b FROM t1 WHERE b > 'o' AND b < 'p'; 109# } 110#} {1 {database disk image is malformed}} 111 112finish_test 113