1# 2007 April 6 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. 15# 16# $Id: corrupt3.test,v 1.2 2007/04/06 21:42:22 drh Exp $ 17 18set testdir [file dirname $argv0] 19source $testdir/tester.tcl 20 21# This module uses hard-coded offsets which do not work if the reserved_bytes 22# value is nonzero. 23if {[nonzero_reserved_bytes]} {finish_test; return;} 24 25# These tests deal with corrupt database files 26# 27database_may_be_corrupt 28 29# We must have the page_size pragma for these tests to work. 30# 31ifcapable !pager_pragmas||direct_read { 32 finish_test 33 return 34} 35 36# Create a database with an overflow page. 37# 38do_test corrupt3-1.1 { 39 set bigstring [string repeat 0123456789 200] 40 execsql { 41 PRAGMA auto_vacuum=OFF; 42 PRAGMA page_size=1024; 43 CREATE TABLE t1(x); 44 INSERT INTO t1 VALUES($bigstring); 45 } 46 file size test.db 47} [expr {1024*3}] 48 49# Verify that the file format is as we expect. The page size 50# should be 1024 bytes. The only record should have a single 51# overflow page. The overflow page is page 3. The pointer to 52# the overflow page is on the last 4 bytes of page 2. 53# 54do_test corrupt3-1.2 { 55 hexio_get_int [hexio_read test.db 16 2] 56} 1024 ;# The page size is 1024 57do_test corrupt3-1.3 { 58 hexio_get_int [hexio_read test.db 20 1] 59} 0 ;# Unused bytes per page is 0 60do_test corrupt3-1.4 { 61 hexio_get_int [hexio_read test.db 2044 4] 62} 3 ;# Overflow page is 3 63do_test corrupt3-1.5 { 64 hexio_get_int [hexio_read test.db 2048 4] 65} 0 ;# First chained overflow is 0 66 67integrity_check corrupt3-1.6 68 69# Make the overflow chain loop back on itself. See if the 70# corruption is detected. (Actually, the last pointer in 71# an overflow chain is ignored, so this is not an error.) 72# 73do_test corrupt3-1.7 { 74 db close 75 hexio_write test.db 2048 [hexio_render_int32 3] 76 sqlite3 db test.db 77 catchsql { 78 SELECT x FROM t1 79 } 80} [list 0 $bigstring] 81integrity_check corrupt3-1.8 82 83# Change the pointer for the first page of the overflow 84# change to be a non-existant page. 85# 86do_test corrupt3-1.9 { 87 db close 88 hexio_write test.db 2044 [hexio_render_int32 4] 89 sqlite3 db test.db 90 catchsql { 91 SELECT substr(x,1,10) FROM t1 92 } 93} [list 0 0123456789] 94do_test corrupt3-1.10 { 95 catchsql { 96 PRAGMA integrity_check 97 } 98} {0 {{*** in database main *** 99On tree page 2 cell 0: invalid page number 4 100Page 3 is never used}}} 101do_test corrupt3-1.11 { 102 db close 103 hexio_write test.db 2044 [hexio_render_int32 0] 104 sqlite3 db test.db 105 catchsql { 106 SELECT substr(x,1,10) FROM t1 107 } 108} [list 1 {database disk image is malformed}] 109do_test corrupt3-1.12 { 110 catchsql { 111 PRAGMA integrity_check 112 } 113} {0 {{*** in database main *** 114On tree page 2 cell 0: 1 of 1 pages missing from overflow list starting at 0 115Page 3 is never used}}} 116 117finish_test 118