Previously, a page fault taken during copyin/out and related functions would run the entire fault handler while permitting direct access to user addresses. This could also leak across context switches (e.g. if the page fault handler was preempted by an interrupt or slept for disk I/O). To fix, clear SUM in assembly after saving the original version of SSTATUS in the supervisor mode trapframe. Reviewed by: mhorne, jrtc27 Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D29763 |
||
---|---|---|
.. | ||
conf | ||
include | ||
riscv | ||
sifive |