Messages in this thread | | | Date | Wed, 24 Nov 2004 22:17:05 -0500 (EST) | From | Rik van Riel <> | Subject | Re: Further shmctl() SHM_LOCK strangeness |
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On Wed, 24 Nov 2004, Hugh Dickins wrote:
>> regardles of the segment's ownership or permissions, >> providing the size of the segment falls within the >> process's RLIMIT_MEMLOCK limit.
> Offhand I find it hard to grasp whether it's harmless or bad, > but inclined to think bad - if there happen to be lots of small > enough shared memory segments on the system, a series of processes > run by one unprivileged user can lock down lots of memory?
Mlocking and munlocking of shm segments is accounted against the user_struct, not against the process.
This should stop any malicious exploits.
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