Apple Inc.

Ryan Nielsen

Pierre-Olivier J Martel

Dallas Blake De Atley

Pierre Jonathan De Filippis

Eugene M Bistolas

Damien Pascal Sorresso

Stephen M Lottermoser

David P Remahl

Lilynaz Hashemi

Julien Oster

Cristina L Formaini

Eric S Harmon

Mitchell K Allison

Improved messaging applications are described that use a first set of software to test rendering of a message, and if the test is successful the message is allowed to be presented. In one embodiment, a first set of software can attempt to test the renderability of a message and if the test is successful, the message can be stored in a message database. In one embodiment, the first set of software operates in a separate sandbox from a sandbox for a messaging application which displays the message. The first set of software can operate in a first process which is different than a process in which the messaging application runs.

Messaging systems with improved reliability

In an embodiment, a system supports an external trust cache. That is, the trust cache is separate from the kernel image on the non-volatile storage in the system. During boot, the boot code may read the trust cache from the storage and write it to the working memory of the system (e.g. the Random Access Memory (RAM) forming the memory system in the system). The boot code may also validate the kernel image and write it to the memory system. The boot code may program a region register in the processor to define a region in the working memory that encompasses the kernel image and the trust cache, to protect the region from modification/tampering.

External trust cache

Growing community of inventors

San Francisco, CA, United States of America

Ryan Nielsen