ARM Overview: Difference between revisions
Added info on new ARM instruction set patches to mitigate Sceptre exploit
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The 'Undefined' Mode is switched to on the encounter by the CPU of an undefined exception. However, based on the tone used in the ARMv4 manual, and the fact that they blatantly imply this, the exception mode was really meant for the kernel to emulate instructions for the usermode process, and then return.
=== Note regarding the 'Sceptre' exploit ===
ARM have recently added a new CPU instruction to their specification that mitigates cache speculation side-channel exploits. You can read more about this design patch and recommended action to take regarding Sceptre (https://developer.arm.com/-/media/Files/pdf/Cache_Speculation_Side-channels.pdf?revision=8b5a5f33-c686-4b00-8186-187dd2910355 here).
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