linux-master/ipc/util.c

8  *            Occurs in several places in the IPC code.
22  *          obtain the ipc object (kern_ipc_perm) by looking up the id in an idr
39  *	- creating, removing and iterating the existing entries in ipc
133  * @path: Path in procfs
163  * ipc_findkey	- find a key in an ipc identifier set
188  * in the correct order.
271  * is returned. The 'new' entry is returned in a locked state on success.
358  * when the key is not IPC_PRIVATE and that key already exists in the
459  * The function determines the highest assigned index in @ids. It is intended
566 	/* is there some bit set in requested_mode but not in granted_mode? */
581  * @in: kernel permissions
584  * Turn the kernel object @in into a set of permissions descriptions
587 void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out)
589 	out->key	= in->key;
590 	out->uid	= from_kuid_munged(current_user_ns(), in->uid);
591 	out->gid	= from_kgid_munged(current_user_ns(), in->gid);
592 	out->cuid	= from_kuid_munged(current_user_ns(), in->cuid);
593 	out->cgid	= from_kgid_munged(current_user_ns(), in->cgid);
594 	out->mode	= in->mode;
595 	out->seq	= in->seq;
600  * @in: new style ipc permissions
603  * Turn the new style permissions object @in into a compatibility
606 void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out)
608 	out->key	= in->key;
609 	SET_UID(out->uid, in->uid);
610 	SET_GID(out->gid, in->gid);
611 	SET_UID(out->cuid, in->cuid);
612 	SET_GID(out->cgid, in->cgid);
613 	out->mode	= in->mode;
614 	out->seq	= in->seq;
622  * Look for an id in the ipc ids idr and return associated ipc object.
684  * @in:  the permission given as input.
687 int ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out)
689 	kuid_t uid = make_kuid(current_user_ns(), in->uid);
690 	kgid_t gid = make_kgid(current_user_ns(), in->gid);
697 		| (in->mode & S_IRWXUGO);
715  *   - retrieves the ipc object with the given id in the given table.
876 	/* Release the lock we took in start() */