Re: [PATCH v3] ipc,shm: disable shmmax and shmall by default

[Manfred Spraul]

On 04/18/2014 05:36 PM, Michael Kerrisk (man-pages) wrote:
> On Fri, Apr 18, 2014 at 11:26 AM, Manfred Spraul
> <manfred@xxxxxxxxxxxxxxxx> wrote:
> > Obviously my patch has the opposite problem: 64-bit wrap-arounds.
> I know you alluded to a case in another thread, but I couldn't quite
> work out from the mail you referred to whether this was really the
> problem. (And I assume those folks were forced to fix their set-up
> scripts anyway.) So, it's not clear to me whether this is a real
> problem. (And your patch does not worsen things from the current
> situation, right?)
a) When I wrote the comment it was just an idea.
But now I think wrap-around could be an issue, e.g. 
find_vma_intersection(,addr,addr+ULONG_MAX) always returns false, even 
if there are vmas inbetween.

b) If we make ULONG_MAX the default, then it should work.

--
    Manfred
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