table of contents
| IPCCTL_PRE_DOWN_NOLO(9) | Kernel IPC facilities | IPCCTL_PRE_DOWN_NOLO(9) |
NAME¶
ipcctl_pre_down_nolock - retrieve an ipc and check permissions for some IPC_XXX cmd
SYNOPSIS¶
struct kern_ipc_perm * ipcctl_pre_down_nolock(struct ipc_namespace * ns, struct ipc_ids * ids, int id, int cmd, struct ipc64_perm * perm, int extra_perm);
ARGUMENTS¶
ns
ipc namespace
ids
the table of ids where to look for the ipc
id
the id of the ipc to retrieve
cmd
the cmd to check
perm
the permission to set
extra_perm
one extra permission parameter used by msq
DESCRIPTION¶
This function does some common audit and permissions check for some IPC_XXX cmd and is called from semctl_down, shmctl_down and msgctl_down. It must be called without any lock held and - retrieves the ipc with the given id in the given table. - performs some audit and permission check, depending on the given cmd - returns a pointer to the ipc object or otherwise, the corresponding error.
Call holding the both the rwsem and the rcu read lock.
COPYRIGHT¶
| June 2024 | Kernel Hackers Manual 3.10 |