lkml.org 
[lkml]   [2022]   [Feb]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRE: [PATCH] m68k: Implement "current_stack_pointer"
Date
From: Geert Uytterhoeven <geert@linux-m68k.org>
> Sent: 24 February 2022 09:17
>
> On Thu, Feb 24, 2022 at 10:12 AM David Laight <David.Laight@aculab.com> wrote:
> > From: Geert Uytterhoeven
> > > Sent: 24 February 2022 08:59
> > ...
> > > > +register unsigned long current_stack_pointer __asm__("sp");
> > >
> > > I don't know what HARDENED_USERCOPY does, so I don't know if you need
> > > "usp" (see rdusp()) or "sp"?
> >
> > HARDENED_USERCOPY significantly slows down some systems calls
> > (especially things like sendmsg()) by trying to run-time verify
> > that the kernel buffer doesn't overrun a stack frame or kmalloc()ed
>
> Kernel stack frame of user stack frame?

Kernel, the kernel doesn't care if the user stack gets trashed.

David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
\
 
 \ /
  Last update: 2022-02-24 10:55    [W:0.051 / U:1.280 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site