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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" <[email protected]>
This commit is contained in:
Eric W. Biederman 2018-03-22 21:22:26 -05:00
commit d8c6e85432
6 changed files with 62 additions and 65 deletions
Download patch file Download diff file Expand all files Collapse all files

18
ipc/msg.c
View file

@ -101,7 +101,7 @@ static void msg_rcu_free(struct rcu_head *head)
struct kern_ipc_perm *p = container_of(head, struct kern_ipc_perm, rcu);
struct msg_queue *msq = container_of(p, struct msg_queue, q_perm);
security_msg_queue_free(msq);
security_msg_queue_free(&msq->q_perm);
kvfree(msq);
}
@ -127,7 +127,7 @@ static int newque(struct ipc_namespace *ns, struct ipc_params *params)
msq->q_perm.key = key;
msq->q_perm.security = NULL;
retval = security_msg_queue_alloc(msq);
retval = security_msg_queue_alloc(&msq->q_perm);
if (retval) {
kvfree(msq);
return retval;
@ -258,9 +258,7 @@ static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
*/
static inline int msg_security(struct kern_ipc_perm *ipcp, int msgflg)
{
struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm);
return security_msg_queue_associate(msq, msgflg);
return security_msg_queue_associate(ipcp, msgflg);
}
SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg)
@ -380,7 +378,7 @@ static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
msq = container_of(ipcp, struct msg_queue, q_perm);
err = security_msg_queue_msgctl(msq, cmd);
err = security_msg_queue_msgctl(&msq->q_perm, cmd);
if (err)
goto out_unlock1;
@ -502,7 +500,7 @@ static int msgctl_stat(struct ipc_namespace *ns, int msqid,
if (ipcperms(ns, &msq->q_perm, S_IRUGO))
goto out_unlock;
err = security_msg_queue_msgctl(msq, cmd);
err = security_msg_queue_msgctl(&msq->q_perm, cmd);
if (err)
goto out_unlock;
@ -718,7 +716,7 @@ static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg,
list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) {
if (testmsg(msg, msr->r_msgtype, msr->r_mode) &&
!security_msg_queue_msgrcv(msq, msg, msr->r_tsk,
!security_msg_queue_msgrcv(&msq->q_perm, msg, msr->r_tsk,
msr->r_msgtype, msr->r_mode)) {
list_del(&msr->r_list);
@ -784,7 +782,7 @@ static long do_msgsnd(int msqid, long mtype, void __user *mtext,
goto out_unlock0;
}
err = security_msg_queue_msgsnd(msq, msg, msgflg);
err = security_msg_queue_msgsnd(&msq->q_perm, msg, msgflg);
if (err)
goto out_unlock0;
@ -960,7 +958,7 @@ static struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode)
list_for_each_entry(msg, &msq->q_messages, m_list) {
if (testmsg(msg, *msgtyp, mode) &&
!security_msg_queue_msgrcv(msq, msg, current,
!security_msg_queue_msgrcv(&msq->q_perm, msg, current,
*msgtyp, mode)) {
if (mode == SEARCH_LESSEQUAL && msg->m_type != 1) {
*msgtyp = msg->m_type - 1;