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    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 :)

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      Last update: 2007-08-12 16:11    [W:0.020 / U:6.120 seconds]
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