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+# 2015-03-30
+#
+# 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.
+#
+#***********************************************************************
+#
+# Corruption consisting of a database page that thinks it is a child
+# of itself.
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+set testprefix corruptJ
+
+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(a,b);
+ WITH RECURSIVE c(i) AS (VALUES(1) UNION ALL SELECT i+1 FROM c WHERE i<10)
+ INSERT INTO t1(a,b) SELECT i, zeroblob(700) FROM c;
+} {}
+db close
+
+# Corrupt the root page of the t1 table such that the left-child pointer
+# for the very first cell points back to the root. Then try to DROP the
+# table. The clearDatabasePage() routine should not loop.
+#
+do_test 1.2 {
+ hexio_write test.db [expr {2*1024-2}] 02
+ sqlite3 db test.db
+ catchsql { DROP TABLE t1 }
+} {1 {database disk image is malformed}}
+
+# Similar test using a WITHOUT ROWID table
+#
+do_test 2.1 {
+ db close
+ forcedelete test.db
+ sqlite3 db test.db
+ db eval {
+ PRAGMA page_size=1024;
+ PRAGMA auto_vacuum=0;
+ CREATE TABLE t1(a,b,PRIMARY KEY(a,b)) WITHOUT ROWID;
+ WITH RECURSIVE c(i) AS (VALUES(1) UNION ALL SELECT i+1 FROM c WHERE i<100)
+ INSERT INTO t1(a,b) SELECT i, zeroblob(200) FROM c;
+ }
+} {}
+
+# The table is three levels deep. Corrupt the left child of an intermediate
+# page so that it points back to the root page.
+#
+do_test 2.2 {
+ db close
+ hexio_read test.db [expr {9*1024+391}] 8
+} {00000008814D0401}
+do_test 2.2b {
+ hexio_write test.db [expr {9*1024+391}] 00000002
+ sqlite3 db test.db
+ catchsql { PRAGMA secure_delete=ON; DROP TABLE t1; }
+} {1 {database disk image is malformed}}
+
+finish_test