lkml.org 
[lkml]   [2021]   [Feb]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v19 3/7] x86/cet/ibt: Handle signals for Indirect Branch Tracking
On Wed, Feb 03, 2021 at 02:58:58PM -0800, Yu-cheng Yu wrote:
> When an indirect CALL/JMP instruction is executed and before it reaches
> the target, it is in 'WAIT_ENDBR' status, which can be read from
> MSR_IA32_U_CET. The status is part of a task's status before a signal is
> raised and preserved in the signal frame. It is restored for sigreturn.
>
> IBT state machine is described in Intel SDM Vol. 1, Sec. 18.3.
>
> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>

Reviewed-by: Kees Cook <keescook@chromium.org>

--
Kees Cook

\
 
 \ /
  Last update: 2021-02-04 20:54    [W:0.145 / U:0.168 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site