[Bug 265439] copyin() repeatedly traps on some illegal user addresses on RISC-V

In reply to: bugzilla-noreply_a_freebsd.org: "[Bug 265439] copyin() repeatedly traps on some illegal user addresses on RISC-V"
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From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 25 Jul 2022 23:27:40 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265439

Jessica Clarke <jrtc27@freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|New                         |Open
                 CC|                            |jrtc27@freebsd.org
           Assignee|riscv@FreeBSD.org           |markj@FreeBSD.org

--- Comment #1 from Jessica Clarke <jrtc27@freebsd.org> ---
This is a regression in 31218f3209ac ("riscv: Add support for enabling SV48
mode"), right? We do check VIRT_IS_VALID in page_fault_handler and will SIGSEGV
the process or panic the kernel depending on which mode faulted, and copyin etc
will check the address is for userspace before using it, but they check
VM_MAX(_)USER_ADDRESS which is now the SV48 version even when SV39 is in use.

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