Re: [PATCH] kprobe: safely access memory specified by userspace

[Steven Rostedt]

On Thu, 14 Feb 2019 14:10:44 +0000
Changbin Du <changbin.du@xxxxxxxxx> wrote:

> > No I didn't have the fix. I was running an older kernel actually. One
> > before commit 9da3f2b74054406f87dff7101a569217ffceb29b was added.
> > There's nothing actually wrong with that code, since kprobes is allowed
> > to poke at anything. But that commit considers the kernel using copy
> > from user to poke kernel address space is a security bug.
> >   
> Glade to know that. And I wonder wether all such cases have been
> disclosed. I noticed the uprobe code also uses some usercopy functions.

Well, uprobe shouldn't be poking at kernel addresses ;-)

-- Steve