CVSROOT: /cvs
Module name: src
Changes by: guent...@cvs.openbsd.org 2017/10/03 11:36:40
Modified files:
sys/arch/amd64/amd64: fpu.c locore.S trap.c
Log message:
The xrstor instruction will fault if the provided xstate data, which
is under userspace control via sigreturn, fails various consistency
checks. Rather than trying to replicate the CPU's hardwired checks
in C code, handle it like iretq: check in trap() whether a fault
is from the problem instruction and handle it there.
CPU behavior and the potential issue pointed out on Linux kernel-hardening
ok mikeb@ deraadt@
