test/corruptK.test

# 2017-03-03
#
# 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.
#
#***********************************************************************
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix corruptK

if {[permutation]=="mmap"} {
  finish_test
  return
}

# This module uses hard-coded offsets which do not work if the reserved_bytes
# value is nonzero.
if {[nonzero_reserved_bytes]} {finish_test; return;}
database_may_be_corrupt

# Initialize the database.
# 
do_execsql_test 1.1 {
  PRAGMA page_size=1024;
  PRAGMA auto_vacuum=0;
  CREATE TABLE t1(x);

  INSERT INTO t1 VALUES(randomblob(20));
  INSERT INTO t1 VALUES(randomblob(100));   -- make this into a free slot
  INSERT INTO t1 VALUES(randomblob(27));    -- this one will be corrupt
  INSERT INTO t1 VALUES(randomblob(800));

  DELETE FROM t1 WHERE rowid=2;  -- free the 100 byte slot
  PRAGMA page_count
} {2}


# Corrupt the database so that the blob stored immediately before 
# the free slot (rowid==3) has an overlarge length field. So that
# we can use sqlite3_blob_write() to manipulate the size field of
# the free slot.
#
# Then use sqlite3_blob_write() to set the size of said free slot
# to 24 bytes (instead of the actual 100).
#
# Then use the new 24 byte slot. Leaving the in-memory version of
# the page with zero free slots and a large nFree value. Then try
# to allocate another slot to get to defragmentPage().
#
do_test 1.2 {
  db close
  hexio_write test.db [expr 1024 + 0x360] 21
  hexio_write test.db [expr 1024 + 0x363] [format %x [expr 31*2 + 12]]
  sqlite3 db test.db

  set fd [db incrblob t1 x 3]
  fconfigure $fd -translation binary -encoding binary
  seek $fd 30
  puts -nonewline $fd "\x18"
  close $fd
} {}
do_execsql_test 1.3 {
  INSERT INTO t1 VALUES(randomblob(20));
}
do_catchsql_test 1.4 {
  INSERT INTO t1 VALUES(randomblob(90));
} {1 {database disk image is malformed}}

#-------------------------------------------------------------------------
reset_db
do_execsql_test 2.1 {
  PRAGMA page_size=1024;
  PRAGMA auto_vacuum=0;
  CREATE TABLE t1(x);

  INSERT INTO t1 VALUES(randomblob(20));
  INSERT INTO t1 VALUES(randomblob(20));    -- free this one
  INSERT INTO t1 VALUES(randomblob(20));
  INSERT INTO t1 VALUES(randomblob(20));    -- and this one
  INSERT INTO t1 VALUES(randomblob(20));    -- corrupt this one.

  DELETE FROM t1 WHERE rowid IN(2, 4);
  PRAGMA page_count
} {2}

do_test 2.2 {
  db close
  hexio_write test.db [expr 1024 + 0x388] 53
  hexio_write test.db [expr 1024 + 0x38A] 03812C

  sqlite3 db test.db
  set fd [db incrblob t1 x 5]
  fconfigure $fd -translation binary -encoding binary

  seek $fd 22
  puts -nonewline $fd "\x5d"
  close $fd
} {}

do_catchsql_test 2.3 {
  INSERT INTO t1 VALUES(randomblob(900));
} {1 {database disk image is malformed}}




finish_test