[lkml]   [1996]   [Jul]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Misc Fixes
Zefram said this, and I just had to respond:
> >Tried getting this patch through during 1.3; Linus rejected it as making
> >it too easy for module to circumvent securelevel. The fix he wanted was
> >write a functional interfaces so that it would be possible for ext2 to
> >obtain the current securelevel settings, without being able to set it.
> A function such as you describe will effectively give away the address
> of securelevel to malicious code (it knows where the function is and
> doesn't need to do as much as a disassembly), but will still hinder
> legitimate code. The obvious solution is to disallow loading/unloading
> of modules at a sufficiently high securelevel.

Not to jump in or anything, but...
How about a small kernel function to return the current securelevel value?
int get_securelevel();
Then export THAT to modules.


 \ /
  Last update: 2005-03-22 13:37    [W:0.117 / U:0.372 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site