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msg/security: Pass kern_ipc_perm not msg_queue into the msg_queue security hooks

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All of the implementations of security hooks that take msg_queue only
access q_perm the struct kern_ipc_perm member.  This means the
dependencies of the msg_queue security hooks can be simplified by
passing the kern_ipc_perm member of msg_queue.

Making this change will allow struct msg_queue to become private to
ipc/msg.c.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2018-03-22 21:22:26 -05:00
parent 7191adff2a
commit d8c6e85432
6 changed files with 62 additions and 65 deletions
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12
include/linux/lsm_hooks.h
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@ -1575,13 +1575,13 @@ union security_list_options {
int (*msg_msg_alloc_security)(struct msg_msg *msg);
void (*msg_msg_free_security)(struct msg_msg *msg);
int (*msg_queue_alloc_security)(struct msg_queue *msq);
void (*msg_queue_free_security)(struct msg_queue *msq);
int (*msg_queue_associate)(struct msg_queue *msq, int msqflg);
int (*msg_queue_msgctl)(struct msg_queue *msq, int cmd);
int (*msg_queue_msgsnd)(struct msg_queue *msq, struct msg_msg *msg,
int (*msg_queue_alloc_security)(struct kern_ipc_perm *msq);
void (*msg_queue_free_security)(struct kern_ipc_perm *msq);
int (*msg_queue_associate)(struct kern_ipc_perm *msq, int msqflg);
int (*msg_queue_msgctl)(struct kern_ipc_perm *msq, int cmd);
int (*msg_queue_msgsnd)(struct kern_ipc_perm *msq, struct msg_msg *msg,
int msqflg);
int (*msg_queue_msgrcv)(struct msg_queue *msq, struct msg_msg *msg,
int (*msg_queue_msgrcv)(struct kern_ipc_perm *msq, struct msg_msg *msg,
struct task_struct *target, long type,
int mode);