lkml.org 
[lkml]   [2008]   [Jun]   [17]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateTue, 17 Jun 2008 22:36:18 +0100
FromAl Viro <>
SubjectRe: BUG: mmapfile/writev spurious zero bytes (x86_64/not i386, bisected, reproducable)
On Tue, Jun 17, 2008 at 02:24:39PM -0700, Linus Torvalds wrote:

> The whole *and*only* reason for copy_to/from_user() existing AT ALL is 
> exactly the fact that the source or destination access can fault. 

Erm...  The reason for copy_to_user() existing is that dereferencing
a user-supplied address in the kernel does not have to access any
memory reachable in user mode, regardless of any faults.  WTF are you
guys talking about?


\
 
 \ /
  Last update: 2008-06-17 23:39    [from the cache]
©2003-2008