Bug 69277 – A little more WebSQLDatabase thread safety

• Component: WebCore Misc.
• Status: RESOLVED FIXED

[Michael Nordman]

We're getting reports of INVALID_STATE exceptions being throw from the openDatabase method. It looks like there some unsafe initialization code paths that may be the culprit.

[Michael Nordman]

Created attachment 109505 [details]
safer

[WebKit Review Bot]

Attachment 109505 [details] did not pass style-queue:

Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'Source/WebCore/ChangeLog', u'Source/WebCor..." exit_code: 1

Source/WebCore/ChangeLog:5:  Need whitespace between colon and description  [changelog/filechangedescriptionwhitespace] [5]
Source/WebCore/ChangeLog:6:  Need whitespace between colon and description  [changelog/filechangedescriptionwhitespace] [5]
Total errors found: 2 in 5 files


If any of these errors are false positives, please file a bug against check-webkit-style.

[Michael Nordman]

Created attachment 109508 [details]
safer

made some whitespace changes in the changelog file

[Alexey Proskuryakov]

Comment on attachment 109508 [details]
safer

View in context: https://bugs.webkit.org/attachment.cgi?id=109508&action=review

I don't understand thread-safe string copying well enough, so leaving this for someone else (Dave Levin?) to review.

> Source/WebCore/storage/AbstractDatabase.cpp:51
> +static const char versionKey[] = "WebKitDatabaseVersionKey";

Is this actually guaranteed to not use initialization, or do you need to use a pointer?

> Source/WebCore/storage/AbstractDatabase.cpp:298
> +            const String tableName(infoTableName);

We don't use local const variables in WebKit.

> Source/WebCore/storage/AbstractDatabase.cpp:396
> +    const String query(String("SELECT value FROM ") + infoTableName +  " WHERE key = '" + versionKey + "';");

We don't use local const variables in WebKit.

> Source/WebCore/storage/AbstractDatabase.cpp:416
> +    const String query(String("INSERT INTO ") + infoTableName +  " (key, value) VALUES ('" + versionKey + "', ?);");

We don't use local const variables in WebKit.

[Michael Nordman]

Created attachment 109530 [details]
safer

[Michael Nordman]

> Is this actually guaranteed to not use initialization, or do you need to use a pointer?

Yes, no.

> We don't use local const variables in WebKit.

Done x 3

[David Levin]

Comment on attachment 109530 [details]
safer

View in context: https://bugs.webkit.org/attachment.cgi?id=109530&action=review

Looks great!

> Source/WebCore/storage/AbstractDatabase.cpp:2
> + * Copyright (C) 2011 Google Inc. All rights reserved.

In WebKit, we leave the year in tact, so this would become 2010, 2011.

But you don't need to change this back -- just fyi for future changes.

[Michael Nordman]

thank you good reviewer sir!

[WebKit Review Bot]

Comment on attachment 109530 [details]
safer

Clearing flags on attachment: 109530

Committed r96554: <http://trac.webkit.org/changeset/96554>

[WebKit Review Bot]

All reviewed patches have been landed.  Closing bug.