lkml.org 
[lkml]   [2001]   [Jan]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: Subtle MM bug
Date
Stephen C. Tweedie writes:
> On Wed, Jan 10, 2001 at 12:11:16PM -0800, Linus Torvalds wrote:

>> That said, we can easily support the notion of CLONE_CRED if
>> we absolutely have to (and sane people just shouldn't use it),
>> so if somebody wants to work on this for 2.5.x...
>
> But is it really worth the pain? I'd hate to have to audit the
> entire VFS to make sure that it works if another thread changes our
> credentials in the middle of a syscall, so we either end up having to
> lock the credentials over every VFS syscall, or take a copy of the
> credentials and pass it through every VFS internal call that we make.

1. each thread has a copy, and doesn't need to lock it
2. threads are commanded to change their own copy

Credentials could be changed on syscall exit. It is a bit like
doing signals I think, with less overhead than making userspace
muck around with signal handlers and synchronization crud.

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

\
 
 \ /
  Last update: 2005-03-22 13:28    [W:0.123 / U:2.428 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site