lkml.org 
[lkml]   [2019]   [Feb]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 1/2 v2] kprobe: Do not use uaccess functions to access kernel memory that can fault
On Sat, 23 Feb 2019 12:47:46 +0900
Masami Hiramatsu <mhiramat@kernel.org> wrote:

> Since kprobes handler runs in IRQ context, we can not use access_ok() in it.
> (only on x86 + CONFIG_DEBUG_ATOMIC_SLEEP=y)

Is it really IRQ context or exception context? That is, one
(interrupts) happen for any task, but exceptions happen because of the
software that is executed (like a breakpoint). Although you can have a
kprobe trigger in an interrupt handler (where user access wouldn't make
sense anyway). But there should be no problem with user access from an
exception handler.

-- Steve

\
 
 \ /
  Last update: 2019-02-24 01:44    [W:0.169 / U:4.636 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site