[Webkit-unassigned] [Bug 190281] New: Validation in Connection::readBytesFromSocket() is too aggressive

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190281

            Bug ID: 190281
           Summary: Validation in Connection::readBytesFromSocket() is too
                    aggressive
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Platform
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: annulen at yandex.ru

Since r217206 Connection::readBytesFromSocket() validates size of control message. However, it compares cmsg_len with attachmentMaxAmount, while Connection::sendOutgoingMessage() computes it as CMSG_LEN(sizeof(int) * attachmentFDBufferLength) where attachmentFDBufferLength <= attachmentMaxAmount. This mismatch between sender and receiver leads to possibility of assertion failure with large number of attachments, e.g. here 62 attachments have cmsg_length == 264.

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