1# 2004 August 30 {} 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: corrupt.test,v 1.12 2009/07/13 09:41:45 danielk1977 Exp $ 17 18catch {forcedelete test.db test.db-journal test.bu} 19 20set testdir [file dirname $argv0] 21source $testdir/tester.tcl 22 23# Do not use a codec for tests in this file, as the database file is 24# manipulated directly using tcl scripts (using the [hexio_write] command). 25# 26do_not_use_codec 27 28# These tests deal with corrupt database files 29# 30database_may_be_corrupt 31 32# Construct a large database for testing. 33# 34do_test corrupt-1.1 { 35 execsql { 36 BEGIN; 37 CREATE TABLE t1(x); 38 INSERT INTO t1 VALUES(randstr(100,100)); 39 INSERT INTO t1 VALUES(randstr(90,90)); 40 INSERT INTO t1 VALUES(randstr(80,80)); 41 INSERT INTO t1 SELECT x || randstr(5,5) FROM t1; 42 INSERT INTO t1 SELECT x || randstr(6,6) FROM t1; 43 INSERT INTO t1 SELECT x || randstr(7,7) FROM t1; 44 INSERT INTO t1 SELECT x || randstr(8,8) FROM t1; 45 INSERT INTO t1 VALUES(randstr(3000,3000)); 46 INSERT INTO t1 SELECT x || randstr(9,9) FROM t1; 47 INSERT INTO t1 SELECT x || randstr(10,10) FROM t1; 48 INSERT INTO t1 SELECT x || randstr(11,11) FROM t1; 49 INSERT INTO t1 SELECT x || randstr(12,12) FROM t1; 50 CREATE INDEX t1i1 ON t1(x); 51 CREATE TABLE t2 AS SELECT * FROM t1; 52 DELETE FROM t2 WHERE rowid%5!=0; 53 COMMIT; 54 } 55} {} 56integrity_check corrupt-1.2 57 58# Setup for the tests. Make a backup copy of the good database in test.bu. 59# Create a string of garbage data that is 256 bytes long. 60# 61forcecopy test.db test.bu 62set fsize [file size test.db] 63set junk "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" 64while {[string length $junk]<256} {append junk $junk} 65set junk [string range $junk 0 255] 66 67# Go through the database and write garbage data into each 256 segment 68# of the file. Then do various operations on the file to make sure that 69# the database engine can recover gracefully from the corruption. 70# 71for {set i [expr {1*256}]} {$i<$fsize-256} {incr i 256} { 72 set tn [expr {$i/256}] 73 db close 74 forcecopy test.bu test.db 75 set fd [open test.db r+] 76 fconfigure $fd -translation binary 77 seek $fd $i 78 puts -nonewline $fd $junk 79 close $fd 80 do_test corrupt-2.$tn.1 { 81 sqlite3 db test.db 82 catchsql {SELECT count(*) FROM sqlite_master} 83 set x {} 84 } {} 85 do_test corrupt-2.$tn.2 { 86 catchsql {SELECT count(*) FROM t1} 87 set x {} 88 } {} 89 do_test corrupt-2.$tn.3 { 90 catchsql {SELECT count(*) FROM t1 WHERE x>'abcdef'} 91 set x {} 92 } {} 93 do_test corrupt-2.$tn.4 { 94 catchsql {SELECT count(*) FROM t2} 95 set x {} 96 } {} 97 do_test corrupt-2.$tn.5 { 98 catchsql {CREATE TABLE t3 AS SELECT * FROM t1} 99 set x {} 100 } {} 101 do_test corrupt-2.$tn.6 { 102 catchsql {DROP TABLE t1} 103 set x {} 104 } {} 105 do_test corrupt-2.$tn.7 { 106 catchsql {PRAGMA integrity_check} 107 set x {} 108 } {} 109 110 # Check that no page references were leaked. 111 do_test corrupt-2.$tn.8 { 112 set bt [btree_from_db db] 113 db_enter db 114 array set stats [btree_pager_stats $bt] 115 db_leave db 116 set stats(ref) 117 } {0} 118} 119 120#------------------------------------------------------------------------ 121# For these tests, swap the rootpage entries of t1 (a table) and t1i1 (an 122# index on t1) in sqlite_master. Then perform a few different queries 123# and make sure this is detected as corruption. 124# 125do_test corrupt-3.1 { 126 db close 127 forcecopy test.bu test.db 128 sqlite3 db test.db 129 list 130} {} 131do_test corrupt-3.2 { 132 set t1_r [execsql {SELECT rootpage FROM sqlite_master WHERE name = 't1i1'}] 133 set t1i1_r [execsql {SELECT rootpage FROM sqlite_master WHERE name = 't1'}] 134 set cookie [expr [execsql {PRAGMA schema_version}] + 1] 135 execsql " 136 PRAGMA writable_schema = 1; 137 UPDATE sqlite_master SET rootpage = $t1_r WHERE name = 't1'; 138 UPDATE sqlite_master SET rootpage = $t1i1_r WHERE name = 't1i1'; 139 PRAGMA writable_schema = 0; 140 PRAGMA schema_version = $cookie; 141 " 142} {} 143 144# This one tests the case caught by code in checkin [2313]. 145do_test corrupt-3.3 { 146 db close 147 sqlite3 db test.db 148 catchsql { 149 INSERT INTO t1 VALUES('abc'); 150 } 151} {1 {database disk image is malformed}} 152do_test corrupt-3.4 { 153 db close 154 sqlite3 db test.db 155 catchsql { 156 SELECT * FROM t1; 157 } 158} {1 {database disk image is malformed}} 159do_test corrupt-3.5 { 160 db close 161 sqlite3 db test.db 162 catchsql { 163 SELECT * FROM t1 WHERE oid = 10; 164 } 165} {1 {database disk image is malformed}} 166do_test corrupt-3.6 { 167 db close 168 sqlite3 db test.db 169 catchsql { 170 SELECT * FROM t1 WHERE x = 'abcde'; 171 } 172} {1 {database disk image is malformed}} 173 174do_test corrupt-4.1 { 175 db close 176 forcedelete test.db test.db-journal 177 sqlite3 db test.db 178 execsql { 179 PRAGMA page_size = 1024; 180 CREATE TABLE t1(a INTEGER PRIMARY KEY, b TEXT); 181 } 182 for {set i 0} {$i < 10} {incr i} { 183 set text [string repeat $i 220] 184 execsql { INSERT INTO t1 VALUES($i, $text) } 185 } 186 execsql { CREATE INDEX i1 ON t1(b) } 187} {} 188do_test corrupt-4.2 { 189 set iRoot [db one {SELECT rootpage FROM sqlite_master WHERE name = 'i1'}] 190 set iOffset [hexio_get_int [hexio_read test.db [expr 12+($iRoot-1)*1024] 2]] 191 set data [hexio_render_int32 [expr $iRoot - 1]] 192 hexio_write test.db [expr ($iRoot-1)*1024 + $iOffset] $data 193 db close 194 sqlite3 db test.db 195 196 # The following DELETE statement attempts to delete a cell stored on the 197 # root page of index i1. After this cell is deleted it must be replaced 198 # by a cell retrieved from the child page (a leaf) of the deleted cell. 199 # This will fail, as the block modified the database image so that the 200 # child page of the deleted cell is from a table (intkey) b-tree, not an 201 # index b-tree as expected. At one point this was causing an assert() 202 # to fail. 203 catchsql { DELETE FROM t1 WHERE rowid = 3 } 204} {1 {database disk image is malformed}} 205 206do_test corrupt-5.1 { 207 db close 208 forcedelete test.db test.db-journal 209 sqlite3 db test.db 210 211 execsql { PRAGMA page_size = 1024 } 212 set ct "CREATE TABLE t1(c0 " 213 set i 0 214 while {[string length $ct] < 950} { append ct ", c[incr i]" } 215 append ct ")" 216 execsql $ct 217} {} 218 219do_test corrupt-5.2 { 220 db close 221 hexio_write test.db 108 00000000 222 sqlite3 db test.db 223 catchsql { SELECT * FROM sqlite_master } 224} {1 {database disk image is malformed}} 225 226# At one point, the specific corruption caused by this test case was 227# causing a buffer overwrite. Although a crash was never demonstrated, 228# running this testcase under valgrind revealed the problem. 229do_test corrupt-6.1 { 230 db close 231 forcedelete test.db test.db-journal 232 sqlite3 db test.db 233 execsql { 234 PRAGMA page_size = 1024; CREATE TABLE t1(x); 235 } 236 237 # The root page of t1 is 1024 bytes in size. The header is 8 bytes, and 238 # each of the cells inserted by the following INSERT statements consume 239 # 16 bytes (including the 2 byte cell-offset array entry). So the page 240 # can contain up to 63 cells. 241 for {set i 0} {$i < 63} {incr i} { 242 execsql { INSERT INTO t1 VALUES( randomblob(10) ) } 243 } 244 245 # Free the cell stored right at the end of the page (at offset pgsz-14). 246 execsql { DELETE FROM t1 WHERE rowid=1 } 247 set rootpage [db one {SELECT rootpage FROM sqlite_master WHERE name = 't1'}] 248 db close 249 250 set offset [expr ($rootpage * 1024)-14+2] 251 hexio_write test.db $offset 00FF 252 sqlite3 db test.db 253 254 catchsql { INSERT INTO t1 VALUES( randomblob(10) ) } 255} {1 {database disk image is malformed}} 256 257ifcapable oversize_cell_check { 258 db close 259 forcedelete test.db test.db-journal 260 sqlite3 db test.db 261 execsql { 262 PRAGMA page_size = 1024; CREATE TABLE t1(x); 263 } 264 265 do_test corrupt-7.1 { 266 for {set i 0} {$i < 39} {incr i} { 267 execsql { 268 INSERT INTO t1 VALUES(X'000100020003000400050006000700080009000A'); 269 } 270 } 271 } {} 272 db close 273 274 # Corrupt the root page of table t1 so that the first offset in the 275 # cell-offset array points to the data for the SQL blob associated with 276 # record (rowid=10). The root page still passes the checks in btreeInitPage(), 277 # because the start of said blob looks like the start of a legitimate 278 # page cell. 279 # 280 # Test case cc-2 overwrites the blob so that it no longer looks like a 281 # real cell. But, by the time it is overwritten, btreeInitPage() has already 282 # initialized the root page, so no corruption is detected. 283 # 284 # Test case cc-3 inserts an extra record into t1, forcing balance-deeper 285 # to run. After copying the contents of the root page to the new child, 286 # btreeInitPage() is called on the child. This time, it detects corruption 287 # (because the start of the blob associated with the (rowid=10) record 288 # no longer looks like a real cell). At one point the code assumed that 289 # detecting corruption was not possible at that point, and an assert() failed. 290 # 291 set fd [open test.db r+] 292 fconfigure $fd -translation binary -encoding binary 293 seek $fd [expr 1024+8] 294 puts -nonewline $fd "\x03\x14" 295 close $fd 296 297 sqlite3 db test.db 298 do_test corrupt-7.2 { 299 execsql { 300 UPDATE t1 SET x = X'870400020003000400050006000700080009000A' 301 WHERE rowid = 10; 302 } 303 } {} 304 do_test corrupt-7.3 { 305 catchsql { 306 INSERT INTO t1 VALUES(X'000100020003000400050006000700080009000A'); 307 } 308 } {1 {database disk image is malformed}} 309} 310 311db close 312forcedelete test.db test.db-journal 313do_test corrupt-8.1 { 314 sqlite3 db test.db 315 execsql { 316 PRAGMA page_size = 1024; 317 PRAGMA secure_delete = on; 318 PRAGMA auto_vacuum = 0; 319 CREATE TABLE t1(x INTEGER PRIMARY KEY, y); 320 INSERT INTO t1 VALUES(5, randomblob(1900)); 321 } 322 323 hexio_write test.db 2044 [hexio_render_int32 2] 324 hexio_write test.db 24 [hexio_render_int32 45] 325 326 catchsql { INSERT OR REPLACE INTO t1 VALUES(5, randomblob(1900)) } 327} {1 {database disk image is malformed}} 328 329db close 330forcedelete test.db test.db-journal 331do_test corrupt-8.2 { 332 sqlite3 db test.db 333 execsql { 334 PRAGMA page_size = 1024; 335 PRAGMA secure_delete = on; 336 PRAGMA auto_vacuum = 0; 337 CREATE TABLE t1(x INTEGER PRIMARY KEY, y); 338 INSERT INTO t1 VALUES(5, randomblob(900)); 339 INSERT INTO t1 VALUES(6, randomblob(900)); 340 } 341 342 hexio_write test.db 2047 FF 343 hexio_write test.db 24 [hexio_render_int32 45] 344 345 catchsql { INSERT INTO t1 VALUES(4, randomblob(1900)) } 346} {1 {database disk image is malformed}} 347 348finish_test 349