/trunk/test/corruptD.test |
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# 2009 June 3 |
# |
# The author disclaims copyright to this source code. In place of |
# a legal notice, here is a blessing: |
# |
# May you do good and not evil. |
# May you find forgiveness for yourself and forgive others. |
# May you share freely, never taking more than you give. |
# |
#*********************************************************************** |
# |
# $Id: corruptD.test,v 1.2 2009/06/05 17:09:12 drh Exp $ |
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set testdir [file dirname $argv0] |
source $testdir/tester.tcl |
|
# Do not use a codec for tests in this file, as the database file is |
# manipulated directly using tcl scripts (using the [hexio_write] command). |
# |
do_not_use_codec |
|
#-------------------------------------------------------------------------- |
# OVERVIEW |
# |
# This test file attempts to verify that SQLite does not read past the |
# end of any in-memory buffers as a result of corrupted database page |
# images. Usually this happens because a field within a database page |
# that contains an offset to some other structure within the same page |
# is set to too large a value. A database page contains the following |
# such fields: |
# |
# 1. The page header field that contains the offset to the first |
# free block of space. |
# |
# 2. The first two bytes of all but the last free block on the free-block |
# list (the offset to the next free block). |
# |
# 3. The page header field containing the number of cells on the page |
# (implicitly defines the offset to the final element in the cell offset |
# array, which could potentially be off the end of the page). |
# |
# 4. The page header field containing the offset to the start of the cell |
# content area. |
# |
# 5. The contents of the cell offset array. |
# |
# 6. The first few bytes of each cell determine the size of the cell |
# stored within the page, and hence the offset to the final byte of |
# the cell. |
# |
# If any of the above fields are set to too large a value, then a buffer |
# overread may occur. This test script creates and operates on various |
# strategically corrupted database files to attempt to provoke such buffer |
# overreads. |
# |
# Very often, a buffer overread passes unnoticed, particularly in workstation |
# environments. For this reason, this test script should be run using valgrind |
# (or similar) in order to verify that no overreads occur. |
# |
# TEST PLAN |
# |
# Test cases corruptD-1.* are white-box tests. They attempt to corrupt |
# one of the above fields, then exercise each part of the code in btree.c |
# that uses said field. |
# |
# Offset variables 1, 2, 3 and 4 are all checked to make sure they |
# will not result in buffer overruns as part of page initialization in |
# sqlite3BtreeInitPage(). Offsets 5 and 6 cannot be tested as part of |
# page initialization, as trying to do so causes a performance hit. |
# |
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do_test corruptD-1.0 { |
execsql { |
PRAGMA auto_vacuum = 0; |
PRAGMA page_size = 1024; |
CREATE TABLE t1(a, b); |
CREATE INDEX i1 ON t1(a, b); |
} |
for {set ii 1} {$ii < 50} {incr ii} { |
execsql { INSERT INTO t1 VALUES($ii, $ii * $ii) } |
} |
execsql { |
DELETE FROM t1 WHERE a = 10; |
DELETE FROM t1 WHERE a = 20; |
DELETE FROM t1 WHERE a = 30; |
DELETE FROM t1 WHERE a = 40; |
} |
copy_file test.db test.bu |
} {} |
|
proc incr_change_counter {} { |
hexio_write test.db 24 [ |
hexio_render_int32 [expr [hexio_get_int [hexio_read test.db 24 4]] + 1] |
] |
} |
|
proc restore_file {} { |
db close |
copy_file test.bu test.db |
sqlite3 db test.db |
} |
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#------------------------------------------------------------------------- |
# The following tests, corruptD-1.1.*, focus on the page header field |
# containing the offset of the first free block in a page. |
# |
do_test corruptD-1.1.1 { |
incr_change_counter |
hexio_write test.db [expr 1024+1] FFFF |
catchsql { SELECT * FROM t1 } |
} {1 {database disk image is malformed}} |
do_test corruptD-1.1.2 { |
incr_change_counter |
hexio_write test.db [expr 1024+1] [hexio_render_int32 1021] |
catchsql { SELECT * FROM t1 } |
} {1 {database disk image is malformed}} |
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#------------------------------------------------------------------------- |
# The following tests, corruptD-1.2.*, focus on the offsets contained |
# in the first 2 byte of each free-block on the free-list. |
# |
do_test corruptD-1.2.1 { |
restore_file |
} {} |
do_test corruptD-1.2.2 { |
} {} |
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#------------------------------------------------------------------------- |
# The following tests, corruptD-1.4.*, ... |
# |
|
|
#------------------------------------------------------------------------- |
# The following tests, corruptD-1.5.*, focus on the offsets contained |
# in the cell offset array. |
# |
# defragmentPage |
# |
|
finish_test |