On 5/26/2024 5:03 PM, Stuart Ianna wrote:
With the riscv/litex port, we're able to access the TIME and TIMEH CSRs in usermode. I would like to take advantage of this feature to replace the proxies for syscalls, such as timer_gettime with an equivalent implementation that avoids a context switch, where appropriate.
I've been puzzling about this since this discussion started. Do you mean that you can access the hardware interface from user-space? If so, that would be a MASSIVE security hole and would make the port unusable in any product that has even the most minimal security requirements.
That would really be an error. It might be useful during debugging, but would be catastrophic for most uses. Are you sure that you want to exploit such a design flaw this way? I believe we should create an issue for any such behavior to that people are aware and plug that security hole as soon as possible.
Or maybe I got that wrong.
