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    SubjectRe: shmget with SHM_HUGETLB flag: Operation not permitted
    * Jochen Roemling ( wrote:
    > Chris Wright wrote:
    > > In case that part wasn't clear, it would be CAP_IPC_LOCK capability.
    > >
    > Thanks. Capset was the keyword I couldn't remember.
    > _Background:_
    > I would like to install Oracle 10g Database on Linux with HUGETLB
    > support. The oracle binary exits with -EPERM because it is not allowed
    > to create a shared memory segment with the SHM_HUGETLB flag set.

    OK, as expected.

    > I installed the libcap2 package (from debian testing) and now have the
    > tool "setcap" available. I wanted to test this on my example pgm
    > mentioned in the original post using:
    > roesrv01~ # setcap CAP_IPC_LOCK a.out
    > fatal error: Invalid argument
    > usage: setcap [-q] (-|<caps>) <filename> [ ... (-|<capsN>) <filenameN> ]
    > using the number "14" instead of the name "CAP_IPC_LOCK" doesn't work
    > either. I don't have any glue. Do have a simple example for me?

    did you try setpcaps? smth like setpcaps cap_ipc_lock+e <pid>

    > By the way: CAP_IPC_LOCK is only checked in line 508 of ipc/shm.c:
    > if (!capable(CAP_IPC_LOCK)) {
    > err = -EPERM;
    > goto out;
    > }
    > There is nothing around that says: "Allow this only without HUGETLB".
    > Are you sure that this capability is my problem?

    Yes, take a look at fs/hugetlbfs/inode.c::hugetlb_zero_setup()

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