MDEV-10977: [ERROR] InnoDB: Block in space_id 0 in file ibdata1 encrypted.

MDEV-10394: Innodb system table space corrupted

Analysis: After we have read the page in buf_page_io_complete try to
find if the page is encrypted or corrupted. Encryption was determined
by reading FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION field from FIL-header
as a key_version. However, this field is not always zero even when
encryption is not used. Thus, incorrect key_version could lead situation where
decryption is tried to page that is not encrypted.

Fix: We still read key_version information from FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION
field but also check if tablespace has encryption information before trying
encrypt the page.

storage/innobase/buf/buf0buf.cc

@@ -526,6 +526,14 @@ buf_page_is_checksum_valid_crc32(
 {
 	ib_uint32_t	crc32 = buf_calc_page_crc32(read_buf);
 
+#ifdef UNIV_DEBUG_LEVEL2
+	if (!(checksum_field1 == crc32 && checksum_field2 == crc32)) {
+		ib_logf(IB_LOG_LEVEL_INFO,
+			"Page checksum crc32 not valid field1 %lu field2 %lu crc32 %lu.",
+			checksum_field1, checksum_field2, crc32);
+	}
+#endif
+
 	return(checksum_field1 == crc32 && checksum_field2 == crc32);
 }
 
@@ -553,6 +561,13 @@ buf_page_is_checksum_valid_innodb(
 
 	if (checksum_field2 != mach_read_from_4(read_buf + FIL_PAGE_LSN)
 	    && checksum_field2 != buf_calc_page_old_checksum(read_buf)) {
+#ifdef UNIV_DEBUG_LEVEL2
+		ib_logf(IB_LOG_LEVEL_INFO,
+			"Page checksum innodb not valid field1 %lu field2 %lu crc32 %lu lsn %lu.",
+			checksum_field1, checksum_field2, buf_calc_page_old_checksum(read_buf),
+			mach_read_from_4(read_buf + FIL_PAGE_LSN)
+		);
+#endif
 		return(false);
 	}
 
@@ -563,6 +578,13 @@ buf_page_is_checksum_valid_innodb(
 
 	if (checksum_field1 != 0
 	    && checksum_field1 != buf_calc_page_new_checksum(read_buf)) {
+#ifdef UNIV_DEBUG_LEVEL2
+		ib_logf(IB_LOG_LEVEL_INFO,
+			"Page checksum innodb not valid field1 %lu field2 %lu crc32 %lu lsn %lu.",
+			checksum_field1, checksum_field2, buf_calc_page_old_checksum(read_buf),
+			mach_read_from_4(read_buf + FIL_PAGE_LSN)
+		);
+#endif
 		return(false);
 	}
 
@@ -581,6 +603,16 @@ buf_page_is_checksum_valid_none(
 	ulint		checksum_field1,
 	ulint		checksum_field2)
 {
+#ifdef UNIV_DEBUG_LEVEL2
+	if (!(checksum_field1 == checksum_field2 || checksum_field1 == BUF_NO_CHECKSUM_MAGIC)) {
+		ib_logf(IB_LOG_LEVEL_INFO,
+			"Page checksum none not valid field1 %lu field2 %lu crc32 %lu lsn %lu.",
+			checksum_field1, checksum_field2, buf_calc_page_old_checksum(read_buf),
+			mach_read_from_4(read_buf + FIL_PAGE_LSN)
+		);
+	}
+#endif
+
 	return(checksum_field1 == checksum_field2
 	       && checksum_field1 == BUF_NO_CHECKSUM_MAGIC);
 }
@@ -598,9 +630,21 @@ buf_page_is_corrupted(
 	ulint		zip_size)	/*!< in: size of compressed page;
 					0 for uncompressed pages */
 {
-	ulint		page_encrypted = fil_page_is_encrypted(read_buf);
 	ulint		checksum_field1;
 	ulint		checksum_field2;
+	ulint 		space_id = mach_read_from_4(
+		read_buf + FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID);
+	fil_space_crypt_t* crypt_data = fil_space_get_crypt_data(space_id);
+	bool page_encrypted = false;
+
+	/* Page is encrypted if encryption information is found from
+	tablespace and page contains used key_version. This is true
+	also for pages first compressed and then encrypted. */
+	if (crypt_data &&
+	    crypt_data->type != CRYPT_SCHEME_UNENCRYPTED &&
+	    fil_page_is_encrypted(read_buf)) {
+		page_encrypted = true;
+	}
 
 	if (!page_encrypted && !zip_size
 	    && memcmp(read_buf + FIL_PAGE_LSN + 4,
@@ -610,6 +654,11 @@ buf_page_is_corrupted(
 		/* Stored log sequence numbers at the start and the end
 		of page do not match */
 
+		ib_logf(IB_LOG_LEVEL_INFO,
+			"Log sequence number at the start %lu and the end %lu do not match.",
+			mach_read_from_4(read_buf + FIL_PAGE_LSN + 4),
+			mach_read_from_4(read_buf + UNIV_PAGE_SIZE - FIL_PAGE_END_LSN_OLD_CHKSUM + 4));
+
 		return(TRUE);
 	}
 
@@ -676,6 +725,9 @@ buf_page_is_corrupted(
 		/* make sure that the page is really empty */
 		for (ulint i = 0; i < UNIV_PAGE_SIZE; i++) {
 			if (read_buf[i] != 0) {
+				ib_logf(IB_LOG_LEVEL_INFO,
+					"Checksum fields zero but page is not empty.");
+
 				return(TRUE);
 			}
 		}
@@ -686,7 +738,7 @@ buf_page_is_corrupted(
 	DBUG_EXECUTE_IF("buf_page_is_corrupt_failure", return(TRUE); );
 
 	ulint	page_no = mach_read_from_4(read_buf + FIL_PAGE_OFFSET);
-	ulint	space_id = mach_read_from_4(read_buf + FIL_PAGE_SPACE_ID);
+
 	const srv_checksum_algorithm_t	curr_algo =
 		static_cast<srv_checksum_algorithm_t>(srv_checksum_algorithm);
 
@@ -4531,7 +4583,7 @@ buf_page_io_complete(
 	if (io_type == BUF_IO_READ) {
 		ulint	read_page_no;
 		ulint	read_space_id;
-		byte*	frame;
+		byte*	frame = NULL;
 
 		if (!buf_page_decrypt_after_read(bpage)) {
 			/* encryption error! */
@@ -4540,7 +4592,8 @@ buf_page_io_complete(
 			} else {
 				frame = ((buf_block_t*) bpage)->frame;
 			}
-			goto corrupt;
+
+			goto database_corrupted;
 		}
 
 		if (buf_page_get_zip_size(bpage)) {
@@ -4551,7 +4604,7 @@ buf_page_io_complete(
 						   FALSE)) {
 
 				buf_pool->n_pend_unzip--;
-				goto corrupt;
+				goto database_corrupted;
 			}
 			buf_pool->n_pend_unzip--;
 		} else {
@@ -4614,7 +4667,7 @@ buf_page_io_complete(
 				}
 				goto page_not_corrupt;
 				;);
-corrupt:
+database_corrupted:
 			bool corrupted = buf_page_check_corrupt(bpage);
 
 			if (corrupted) {
@@ -6177,6 +6230,19 @@ buf_page_decrypt_after_read(
 	bool page_compressed_encrypted = fil_page_is_compressed_encrypted(dst_frame);
 	buf_pool_t* buf_pool = buf_pool_from_bpage(bpage);
 	bool success = true;
+	ulint 		space_id = mach_read_from_4(
+		dst_frame + FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID);
+	fil_space_crypt_t* crypt_data = fil_space_get_crypt_data(space_id);
+
+	/* Page is encrypted if encryption information is found from
+	tablespace and page contains used key_version. This is true
+	also for pages first compressed and then encrypted. */
+	if (!crypt_data ||
+	    (crypt_data &&
+	     crypt_data->type == CRYPT_SCHEME_UNENCRYPTED &&
+	     key_version != 0)) {
+		key_version = 0;
+	}
 
 	/* If page is encrypted read post-encryption checksum */
 	if (!page_compressed_encrypted && key_version != 0) {