Hi Davidlohr,
On 09/16/2013 05:04 AM, Davidlohr Bueso wrote:
This fixes a race in shmat() between finding the msq and
actually attaching the segment, as another thread can delete shmid
underneath us if we are preempted before acquiring the kern_ipc_perm.lock.
According the the man page, Linux supports attaching to deleted shm
segments:
http://linux.die.net/man/2/shmat
On Linux, it is possible to attach a shared memory segment even if it
is already marked to be deleted. However, POSIX.1-2001 does not
specify this behavior and many other implementations do not support it.
Does your patch change that?
Unfortunately, I have neither any experience with ipc/shm nor any test
cases.
And:
As far as I can see it's not a problem if we are attaching to a deleted
segment: shm_close cleans up everything.
--
Manfred
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