[lkml]   [2007]   [Aug]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [BUGFIX] NULL pointer dereference in __vm_enough_memory()
On Sun, Aug 12, 2007 at 02:19:05PM +0100, Alan Cox wrote:
> > > Great! So the problem might have existed for some time, but we never
> > > saw it due to default over commit values? Were you using these values
> > > for over commit even before?
> >
> > No I changed it several weeks ago to stop my desktop from freezing.
> > So yes, the bug may have been there for a while.
> The bug is the new exec with lots of arguments code. It tries to insert a
> vm struct without having a valid current->mm. That isn't permitted and
> never had been (which is also why it broke the sparc mmu code etc).
> You'll need to change the kernel security interface a little to make this
> fly - I think the following should do it.
> - make __vm_enough_memory take a struct mm pointer and use it
> - make security_ops pass the extra current->mm
> - add a vm_enough_memory_mm security op
> - use security_vm_enough_memory_mm(mm, ...) in __insert_vm_struct
> I'll knock up a quick patch and see what is needed (someone else can do
> the selinux changes)

Thank you!

Count me for one - but CC SELinux maintainers first :)

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2007-08-12 16:11    [W:0.127 / U:7.044 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site