lkml.org 
[lkml]   [1998]   [Aug]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: copy_from_user() fix
Hi!

> > > Thats a matter for glibc. If you wrap the glibc syscall macros to do
> > > a raise(SIGSEGV) then you get your desire. So its a non kernel item ;)
> >
> > Still, I think that this could be in kernel. It is faster to do here
> > (you can SIGSEGV it directly from pagefault handler), and IMO you
> > _should_ get SIGSEGV for read(0,0,1)...
>
> Since when has SIGSEGV on a memory error been performance critical ?

It is not. But read again your solution (marked with smiley ;):

You propose to slow down every syscall return by test
if (retcode == -EFAULT) raise(SIGSEGV).

My argument is that if you do it from within kernel there's no such
slowdown.

Pavel

--
I'm really pavel@atrey.karlin.mff.cuni.cz. Pavel
Look at http://atrey.karlin.mff.cuni.cz/~pavel/ ;-).

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.altern.org/andrebalsa/doc/lkml-faq.html

\
 
 \ /
  Last update: 2005-03-22 13:44    [W:0.080 / U:0.100 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site