4 ms·

I just looked it up in the Armv8 manual and there is a control setting that makes the processor ignore the executable permissions for any writable pages. It sta

I just looked it up in the Armv8 manual and there is a control setting that makes the processor ignore the executable permissions for any writable pages. It states these controls ‘are intended to be used in systems with very high security requirements.’ which suggests there are drawbacks. https://armv8-ref.codingbelief.com/en/chapter_d4/d44_1_memory_access_control.html https://armv8-ref.codingbelief.com/en/chapter_d4/d44_1_memor...

Dylan16807 4y ago
The drawback is you have to rewrite some old code. I don't think there's anything else of note. Maybe there are situations where switching permissions is too expensive in an unavoidable way but that borders on chip design problem...
- Jweb_Guru 4y ago
  My understanding is that trying to execute a page that's been written to is already insanely slow on essentially all modern processors, whether or not they care about security.
  - tinus_hn 4y ago
    Makes sense, that would conflict with features like branch prediction.