Re: [RFC, PATCH] ipc/util.c: use idr_alloc_cyclic() for ipc allocations

On 10/2/18 8:27 PM, Waiman Long wrote: On 10/02/2018 12:19 PM, Manfred Spraul wrote: A bit related to the patch series that increases IPC_MNI: (User space) id reuse create the risk of data corruption: Process A: calls ipc function Process A: sleeps just at the beginning of the syscall Process

Re: [RFC, PATCH] ipc/util.c: use idr_alloc_cyclic() for ipc allocations

On 10/02/2018 12:19 PM, Manfred Spraul wrote: > A bit related to the patch series that increases IPC_MNI: > > (User space) id reuse create the risk of data corruption: > > Process A: calls ipc function > Process A: sleeps just at the beginning of the syscall > Process B: Frees the ipc object (i.e.:

[RFC, PATCH] ipc/util.c: use idr_alloc_cyclic() for ipc allocations

A bit related to the patch series that increases IPC_MNI: (User space) id reuse create the risk of data corruption: Process A: calls ipc function Process A: sleeps just at the beginning of the syscall Process B: Frees the ipc object (i.e.: calls ...ctl(IPC_RMID) Process B: Creates a new ipc objec