Messages in this thread | | | Subject | Re: Users locking memory using futexes | From | Alan Cox <> | Date | 12 Nov 2002 18:06:24 +0000 |
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On Tue, 2002-11-12 at 17:17, Rusty Russell wrote: > > Ouch! It looks to me like userspace can use FUTEX_FD to lock many > > pages of memory, achieving the same as mlock() but without the > > resource checks. > > > > Denial of service attack? > > See "pipe".
Thats not an excuse. If the futex stuff allows arbitary memory locking and it isnt properly accounted then its a bug, with the added problem that its easier to have nasty accidents with than pipes.
We have a per user object nowdays so accounting per user locked memory looks rather doable both for mlock, pipe, af_unix socket and for other things
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