MDEV-19335 adjustment for innodb_checksum_algorithm=full_crc32

When MDEV-12026 introduced innodb_checksum_algorithm=full_crc32 in
MariaDB 10.4, it accidentally added a dependency on buf_page_t::encrypted.
Now that the flag has been removed, we must adjust the page-read routine.

buf_page_io_complete(): When the full_crc32 page checksum matches but the
tablespace ID in the page does not match after decrypting, we should
declare it a decryption failure and suppress the page dump output and
any attempts to re-read the page.

mysql-test/suite/encryption/r/innodb-bad-key-change.result

@@ -6,6 +6,7 @@ call mtr.add_suppression("failed to read or decrypt \\[page id: space=[1-9][0-9]
 call mtr.add_suppression("InnoDB: Encrypted page \\[page id: space=[1-9][0-9]*, page number=3\\] in file .*test.t1.ibd looks corrupted; key_version=1");
 call mtr.add_suppression("InnoDB: Table `test`\\.`t[12]` is corrupted");
 call mtr.add_suppression("File '.*mysql-test.std_data.keysbad3\\.txt' not found");
+call mtr.add_suppression("\\[ERROR\\] InnoDB: Cannot decrypt \\[page id: space=");
 # Start server with keys2.txt
 # restart: --file-key-management-filename=MYSQL_TEST_DIR/std_data/keys2.txt
 SET GLOBAL innodb_file_per_table = ON;

mysql-test/suite/encryption/r/innodb-bad-key-change2.result

@@ -6,6 +6,7 @@ call mtr.add_suppression("InnoDB: Tablespace for table \`test\`.\`t1\` is set as
 call mtr.add_suppression("InnoDB: Table `test`\\.`t1` is corrupted");
 call mtr.add_suppression("InnoDB: Cannot delete tablespace .* because it is not found in the tablespace memory cache");
 call mtr.add_suppression("InnoDB: ALTER TABLE `test`\\.`t1` DISCARD TABLESPACE failed to find tablespace");
+call mtr.add_suppression("\\[ERROR\\] InnoDB: Cannot decrypt \\[page id: space=");
 # restart: --plugin-load-add=file_key_management.so --file-key-management --file-key-management-filename=MYSQL_TEST_DIR/std_data/keys2.txt
 SET GLOBAL innodb_file_per_table = ON;
 CREATE TABLE t1 (pk INT PRIMARY KEY, f VARCHAR(8)) ENGINE=InnoDB

mysql-test/suite/encryption/r/innodb-bad-key-change4.result

@@ -3,6 +3,7 @@ call mtr.add_suppression("InnoDB: The page \\[page id: space=[1-9][0-9]*, page n
 call mtr.add_suppression("failed to read or decrypt \\[page id: space=[1-9][0-9]*, page number=[1-9][0-9]*\\]");
 call mtr.add_suppression("Couldn't load plugins from 'file_key_management");
 call mtr.add_suppression("InnoDB: Table `test`\\.`t1` is corrupted");
+call mtr.add_suppression("\\[ERROR\\] InnoDB: Cannot decrypt \\[page id: space=");
 # restart: --plugin-load-add=file_key_management.so --file-key-management --file-key-management-filename=MYSQL_TEST_DIR/std_data/keys2.txt
 SET GLOBAL innodb_file_per_table = ON;
 CREATE TABLE t1 (pk INT PRIMARY KEY, f VARCHAR(8)) ENGINE=InnoDB

mysql-test/suite/encryption/t/innodb-bad-key-change.combinations

+[crc32]
+loose-innodb-checksum-algorithm=crc32
+[full_crc32]
+loose-innodb-checksum-algorithm=full_crc32

mysql-test/suite/encryption/t/innodb-bad-key-change.test

@@ -16,6 +16,8 @@ call mtr.add_suppression("failed to read or decrypt \\[page id: space=[1-9][0-9]
 call mtr.add_suppression("InnoDB: Encrypted page \\[page id: space=[1-9][0-9]*, page number=3\\] in file .*test.t1.ibd looks corrupted; key_version=1");
 call mtr.add_suppression("InnoDB: Table `test`\\.`t[12]` is corrupted");
 call mtr.add_suppression("File '.*mysql-test.std_data.keysbad3\\.txt' not found");
+# for innodb_checksum_algorithm=full_crc32 only
+call mtr.add_suppression("\\[ERROR\\] InnoDB: Cannot decrypt \\[page id: space=");
 
 --echo # Start server with keys2.txt
 -- let $restart_parameters=--file-key-management-filename=$MYSQL_TEST_DIR/std_data/keys2.txt

mysql-test/suite/encryption/t/innodb-bad-key-change2.combinations

+[crc32]
+loose-innodb-checksum-algorithm=crc32
+[full_crc32]
+loose-innodb-checksum-algorithm=full_crc32

mysql-test/suite/encryption/t/innodb-bad-key-change2.test

@@ -17,6 +17,8 @@ call mtr.add_suppression("InnoDB: Tablespace for table \`test\`.\`t1\` is set as
 call mtr.add_suppression("InnoDB: Table `test`\\.`t1` is corrupted");
 call mtr.add_suppression("InnoDB: Cannot delete tablespace .* because it is not found in the tablespace memory cache");
 call mtr.add_suppression("InnoDB: ALTER TABLE `test`\\.`t1` DISCARD TABLESPACE failed to find tablespace");
+# for innodb_checksum_algorithm=full_crc32 only
+call mtr.add_suppression("\\[ERROR\\] InnoDB: Cannot decrypt \\[page id: space=");
 
 --let $restart_parameters=--plugin-load-add=file_key_management.so --file-key-management --file-key-management-filename=$MYSQL_TEST_DIR/std_data/keys2.txt
 --source include/restart_mysqld.inc

mysql-test/suite/encryption/t/innodb-bad-key-change3.combinations

+[crc32]
+loose-innodb-checksum-algorithm=crc32
+[full_crc32]
+loose-innodb-checksum-algorithm=full_crc32

mysql-test/suite/encryption/t/innodb-bad-key-change4.combinations

+[crc32]
+loose-innodb-checksum-algorithm=crc32
+[full_crc32]
+loose-innodb-checksum-algorithm=full_crc32

mysql-test/suite/encryption/t/innodb-bad-key-change4.test

@@ -13,6 +13,8 @@ call mtr.add_suppression("failed to read or decrypt \\[page id: space=[1-9][0-9]
 # Suppression for builds where file_key_management plugin is linked statically
 call mtr.add_suppression("Couldn't load plugins from 'file_key_management");
 call mtr.add_suppression("InnoDB: Table `test`\\.`t1` is corrupted");
+# for innodb_checksum_algorithm=full_crc32 only
+call mtr.add_suppression("\\[ERROR\\] InnoDB: Cannot decrypt \\[page id: space=");
 
 --let $restart_parameters=--plugin-load-add=file_key_management.so --file-key-management --file-key-management-filename=$MYSQL_TEST_DIR/std_data/keys2.txt
 --source include/restart_mysqld.inc

storage/innobase/buf/buf0buf.cc

@@ -5955,7 +5955,7 @@ static dberr_t buf_page_check_corrupt(buf_page_t* bpage, fil_space_t* space)
 	not decrypted and it could be either encrypted and corrupted
 	or corrupted or good page. If we decrypted, there page could
 	still be corrupted if used key does not match. */
-	const bool seems_encrypted = (!space->full_crc32() && key_version)
+	const bool seems_encrypted = !space->full_crc32() && key_version
 		&& space->crypt_data
 		&& space->crypt_data->type != CRYPT_SCHEME_UNENCRYPTED;
 	ut_ad(space->purpose != FIL_TYPE_TEMPORARY || space->full_crc32());
@@ -5970,7 +5970,6 @@ static dberr_t buf_page_check_corrupt(buf_page_t* bpage, fil_space_t* space)
 			    space->id, dst_frame, space->is_compressed())) {
 			err = DB_PAGE_CORRUPTED;
 		}
-
 	} else if (buf_page_is_corrupted(true, dst_frame, space->flags)) {
 		err = DB_PAGE_CORRUPTED;
 	}
@@ -6085,13 +6084,26 @@ buf_page_io_complete(buf_page_t* bpage, bool dblwr, bool evict)
 
 		} else if (read_space_id == 0 && read_page_no == 0) {
 			/* This is likely an uninitialized page. */
-		} else if ((bpage->id.space() != TRX_SYS_SPACE
+		} else if (((!space->full_crc32()
+			     || bpage->id.space() != TRX_SYS_SPACE)
 			    && bpage->id.space() != read_space_id)
 			   || bpage->id.page_no() != read_page_no) {
-			/* We did not compare space_id to read_space_id
-			in the system tablespace, because the field
-			was written as garbage before MySQL 4.1.1,
-			which did not support innodb_file_per_table. */
+			/* We do not compare space_id to read_space_id
+			in the system tablespace unless space->full_crc32(),
+			because the field was written as garbage before
+			MySQL 4.1.1, which introduced support for
+			innodb_file_per_table. */
+
+			if (space->full_crc32()
+			    && *reinterpret_cast<uint32_t*>
+			    (&frame[FIL_PAGE_FCRC32_KEY_VERSION])
+			    && space->crypt_data
+			    && space->crypt_data->type
+			    != CRYPT_SCHEME_UNENCRYPTED) {
+				ib::error() << "Cannot decrypt " << bpage->id;
+				err = DB_DECRYPTION_FAILED;
+				goto release_page;
+			}
 
 			ib::error() << "Space id and page no stored in "
 				"the page, read in are "
@@ -6165,6 +6177,7 @@ buf_page_io_complete(buf_page_t* bpage, bool dblwr, bool evict)
 
 		if (err == DB_PAGE_CORRUPTED
 		    || err == DB_DECRYPTION_FAILED) {
+release_page:
 			const page_id_t corrupt_page_id = bpage->id;
 
 			buf_corrupt_page_release(bpage, space);