lkml.org 
[lkml]   [2023]   [Mar]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v5 22/34] x86/fred: FRED initialization code
On Sat, Mar 18, 2023 at 02:33:30PM +0800, Lai Jiangshan wrote:
> If there is no other concrete reason other than overflowing for
> assigning NMI and #DB with a stack level > 0, #VE should also
> be assigned with a stack level > 0, and #BP too. #VE can happen
> anytime and anywhere, so it is subject to overflowing too.

So #BP needs the stack-gap (redzone) for text_poke_bp().

#BP can end up in kprobes which can then end up in ftrace/perf,
depending on how it's all wired up.

#VE is currently a trainwreck vs NMI/MCE, but I think FRED solves the
worst of that. I'm not exactly sure how deep the #VE handler goes.


\
 
 \ /
  Last update: 2023-03-27 01:09    [W:0.139 / U:0.012 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site