Follow-up to MDEV-12112: corruption in encrypted table may be overlooked

The initial fix only covered a part of Mariabackup.
This fix hardens InnoDB and XtraDB in a similar way, in order
to reduce the probability of mistaking a corrupted encrypted page
for a valid unencrypted one.

This is based on work by Thirunarayanan Balathandayuthapani.

fil_space_verify_crypt_checksum(): Assert that key_version!=0.
Let the callers guarantee that. Now that we have this assertion,
we also know that buf_page_is_zeroes() cannot hold.
Also, remove all diagnostic output and related parameters,
and let the relevant callers emit such messages.
Last but not least, validate the post-encryption checksum
according to the innodb_checksum_algorithm (only accepting
one checksum for the strict variants), and no longer
try to validate the page as if it was unencrypted.

buf_page_is_zeroes(): Move to the compilation unit of the only callers,
and declare static.

xb_fil_cur_read(), buf_page_check_corrupt(): Add a condition before
calling fil_space_verify_crypt_checksum(). This is a non-functional
change.

buf_dblwr_process(): Validate the page only as encrypted or unencrypted,
but not both.

2 files changed, 5 insertions, 7 deletions

diff --git a/mysql-test/suite/encryption/r/innodb-force-corrupt.result b/mysql-test/suite/encryption/r/innodb-force-corrupt.result
index 7d63f47d17e..3b1a2d8300f 100644
--- a/mysql-test/suite/encryption/r/innodb-force-corrupt.result
+++ b/mysql-test/suite/encryption/r/innodb-force-corrupt.result
@@ -1,5 +1,4 @@
-call mtr.add_suppression("InnoDB: The page \\[page id: space=[1-9][0-9]*, page number=[1-9][0-9]*\\] in file '.*test.t[123]\\.ibd' cannot be decrypted\\.");
-call mtr.add_suppression("InnoDB: Database page corruption on disk or a failed file read of tablespace test/t[0-9]+ page \[page id: space=[0-9]+, page number=[0-9]+\]. You may have to recover from a backup.");
+call mtr.add_suppression("InnoDB: Encrypted page \\d+:[36] in file .*test.t[123]\\.ibd looks corrupted; key_version=3221342974");
 SET GLOBAL innodb_file_format = `Barracuda`;
 SET GLOBAL innodb_file_per_table = ON;
 set global innodb_compression_algorithm = 1;
diff --git a/mysql-test/suite/encryption/t/innodb-force-corrupt.test b/mysql-test/suite/encryption/t/innodb-force-corrupt.test
index cb6440127cc..07f79c6b378 100644
--- a/mysql-test/suite/encryption/t/innodb-force-corrupt.test
+++ b/mysql-test/suite/encryption/t/innodb-force-corrupt.test
@@ -7,8 +7,7 @@
 # Don't test under embedded
 -- source include/not_embedded.inc
 
-call mtr.add_suppression("InnoDB: The page \\[page id: space=[1-9][0-9]*, page number=[1-9][0-9]*\\] in file '.*test.t[123]\\.ibd' cannot be decrypted\\.");
-call mtr.add_suppression("InnoDB: Database page corruption on disk or a failed file read of tablespace test/t[0-9]+ page \[page id: space=[0-9]+, page number=[0-9]+\]. You may have to recover from a backup.");
+call mtr.add_suppression("InnoDB: Encrypted page \\d+:[36] in file .*test.t[123]\\.ibd looks corrupted; key_version=3221342974");
 
 --disable_warnings
 SET GLOBAL innodb_file_format = `Barracuda`;
@@ -53,17 +52,17 @@ perl;
 open(FILE, "+<", "$ENV{MYSQLD_DATADIR}/test/t1.ibd") or die "open";
 binmode FILE;
 seek(FILE, $ENV{'INNODB_PAGE_SIZE'} * 3 + 26, SEEK_SET) or die "seek";
-print FILE pack("H*", "c00lcafedeadb017");
+print FILE pack("H*", "c001cafedeadb017");
 close FILE or die "close";
 open(FILE, "+<", "$ENV{MYSQLD_DATADIR}/test/t2.ibd") or die "open";
 binmode FILE;
 seek(FILE, $ENV{'INNODB_PAGE_SIZE'} * 3 + 26, SEEK_SET) or die "seek";
-print FILE pack("H*", "c00lcafedeadb017");
+print FILE pack("H*", "c001cafedeadb017");
 close FILE or die "close";
 open(FILE, "+<", "$ENV{MYSQLD_DATADIR}/test/t3.ibd") or die "open";
 binmode FILE;
 seek(FILE, $ENV{'INNODB_PAGE_SIZE'} * 3 + 26, SEEK_SET) or die "seek";
-print FILE pack("H*", "c00lcafedeadb017");
+print FILE pack("H*", "c001cafedeadb017");
 close FILE or die "close";
 EOF