3 # The author disclaims copyright to this source code. In place of
4 # a legal notice, here is a blessing:
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.
10 #***********************************************************************
11 # This file implements regression tests for SQLite library.
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.
17 # $Id: corrupt7.test,v 1.8 2009/08/10 10:18:08 danielk1977 Exp $
19 set testdir [file dirname $argv0]
20 source $testdir/tester.tcl
22 # This module uses hard-coded offsets which do not work if the reserved_bytes
24 if {[nonzero_reserved_bytes]} {finish_test; return;}
26 # These tests deal with corrupt database files
28 database_may_be_corrupt
30 # We must have the page_size pragma for these tests to work.
32 ifcapable !pager_pragmas {
37 # Create a simple, small database.
39 do_test corrupt7-1.1 {
41 PRAGMA auto_vacuum=OFF;
42 PRAGMA page_size=1024;
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;
53 # Verify that the file format is as we expect. The page size
54 # should be 1024 bytes.
56 do_test corrupt7-1.2 {
57 hexio_get_int [hexio_read test.db 16 2]
58 } 1024 ;# The page size is 1024
59 do_test corrupt7-1.3 {
60 hexio_get_int [hexio_read test.db 20 1]
61 } 0 ;# Unused bytes per page is 0
63 integrity_check corrupt7-1.4
65 # Deliberately corrupt some of the cell offsets in the btree page
66 # on page 2 of the database.
67 do_test corrupt7-2.1 {
69 hexio_write test.db 1062 FF
71 db eval {PRAGMA integrity_check(1)}
72 } {{*** in database main ***
73 On tree page 2 cell 15: Offset 65457 out of range 945..1020}}
74 do_test corrupt7-2.2 {
76 hexio_write test.db 1062 04
78 db eval {PRAGMA integrity_check(1)}
79 } {{*** in database main ***
80 On tree page 2 cell 15: Offset 1201 out of range 945..1020}}
82 # The code path that was causing the buffer overrun that this test
83 # case was checking for was removed.
85 #do_test corrupt7-3.1 {
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);
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]
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
108 # SELECT b FROM t1 WHERE b > 'o' AND b < 'p';
110 #} {1 {database disk image is malformed}}