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Subject[REVIEW][PATCH 13/11] ipc/smack: Tidy up from the change in type of the ipc security hooks

Rename the variables shp, sma, msq to isp. As that is how the code already
refers to those variables.

Collapse smack_of_shm, smack_of_sem, and smack_of_msq into smack_of_ipc,
as the three functions had become completely identical.

Collapse smack_shm_alloc_security, smack_sem_alloc_security and
smack_msg_queue_alloc_security into smack_ipc_alloc_security as the
three functions had become identical.

Collapse smack_shm_free_security, smack_sem_free_security and
smack_msg_queue_free_security into smack_ipc_free_security as the three
functions had become identical.

Requested-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
security/smack/smack_lsm.c | 197 +++++++++++++--------------------------------
1 file changed, 58 insertions(+), 139 deletions(-)

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index d960c2ea8d79..0735b8db158b 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -2945,25 +2945,24 @@ static void smack_msg_msg_free_security(struct msg_msg *msg)
}

/**
- * smack_of_shm - the smack pointer for the shm
- * @shp: the object
+ * smack_of_ipc - the smack pointer for the ipc
+ * @isp: the object
*
* Returns a pointer to the smack value
*/
-static struct smack_known *smack_of_shm(struct kern_ipc_perm *shp)
+static struct smack_known *smack_of_ipc(struct kern_ipc_perm *isp)
{
- return (struct smack_known *)shp->security;
+ return (struct smack_known *)isp->security;
}

/**
- * smack_shm_alloc_security - Set the security blob for shm
- * @shp: the object
+ * smack_ipc_alloc_security - Set the security blob for ipc
+ * @isp: the object
*
* Returns 0
*/
-static int smack_shm_alloc_security(struct kern_ipc_perm *shp)
+static int smack_ipc_alloc_security(struct kern_ipc_perm *isp)
{
- struct kern_ipc_perm *isp = shp;
struct smack_known *skp = smk_of_current();

isp->security = skp;
@@ -2971,34 +2970,32 @@ static int smack_shm_alloc_security(struct kern_ipc_perm *shp)
}

/**
- * smack_shm_free_security - Clear the security blob for shm
- * @shp: the object
+ * smack_ipc_free_security - Clear the security blob for ipc
+ * @isp: the object
*
* Clears the blob pointer
*/
-static void smack_shm_free_security(struct kern_ipc_perm *shp)
+static void smack_ipc_free_security(struct kern_ipc_perm *isp)
{
- struct kern_ipc_perm *isp = shp;
-
isp->security = NULL;
}

/**
* smk_curacc_shm : check if current has access on shm
- * @shp : the object
+ * @isp : the object
* @access : access requested
*
* Returns 0 if current has the requested access, error code otherwise
*/
-static int smk_curacc_shm(struct kern_ipc_perm *shp, int access)
+static int smk_curacc_shm(struct kern_ipc_perm *isp, int access)
{
- struct smack_known *ssp = smack_of_shm(shp);
+ struct smack_known *ssp = smack_of_ipc(isp);
struct smk_audit_info ad;
int rc;

#ifdef CONFIG_AUDIT
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
- ad.a.u.ipc_id = shp->id;
+ ad.a.u.ipc_id = isp->id;
#endif
rc = smk_curacc(ssp, access, &ad);
rc = smk_bu_current("shm", ssp, access, rc);
@@ -3007,27 +3004,27 @@ static int smk_curacc_shm(struct kern_ipc_perm *shp, int access)

/**
* smack_shm_associate - Smack access check for shm
- * @shp: the object
+ * @isp: the object
* @shmflg: access requested
*
* Returns 0 if current has the requested access, error code otherwise
*/
-static int smack_shm_associate(struct kern_ipc_perm *shp, int shmflg)
+static int smack_shm_associate(struct kern_ipc_perm *isp, int shmflg)
{
int may;

may = smack_flags_to_may(shmflg);
- return smk_curacc_shm(shp, may);
+ return smk_curacc_shm(isp, may);
}

/**
* smack_shm_shmctl - Smack access check for shm
- * @shp: the object
+ * @isp: the object
* @cmd: what it wants to do
*
* Returns 0 if current has the requested access, error code otherwise
*/
-static int smack_shm_shmctl(struct kern_ipc_perm *shp, int cmd)
+static int smack_shm_shmctl(struct kern_ipc_perm *isp, int cmd)
{
int may;

@@ -3051,81 +3048,42 @@ static int smack_shm_shmctl(struct kern_ipc_perm *shp, int cmd)
default:
return -EINVAL;
}
- return smk_curacc_shm(shp, may);
+ return smk_curacc_shm(isp, may);
}

/**
* smack_shm_shmat - Smack access for shmat
- * @shp: the object
+ * @isp: the object
* @shmaddr: unused
* @shmflg: access requested
*
* Returns 0 if current has the requested access, error code otherwise
*/
-static int smack_shm_shmat(struct kern_ipc_perm *shp, char __user *shmaddr,
+static int smack_shm_shmat(struct kern_ipc_perm *ipc, char __user *shmaddr,
int shmflg)
{
int may;

may = smack_flags_to_may(shmflg);
- return smk_curacc_shm(shp, may);
-}
-
-/**
- * smack_of_sem - the smack pointer for the sem
- * @sma: the object
- *
- * Returns a pointer to the smack value
- */
-static struct smack_known *smack_of_sem(struct kern_ipc_perm *sma)
-{
- return (struct smack_known *)sma->security;
-}
-
-/**
- * smack_sem_alloc_security - Set the security blob for sem
- * @sma: the object
- *
- * Returns 0
- */
-static int smack_sem_alloc_security(struct kern_ipc_perm *sma)
-{
- struct kern_ipc_perm *isp = sma;
- struct smack_known *skp = smk_of_current();
-
- isp->security = skp;
- return 0;
-}
-
-/**
- * smack_sem_free_security - Clear the security blob for sem
- * @sma: the object
- *
- * Clears the blob pointer
- */
-static void smack_sem_free_security(struct kern_ipc_perm *sma)
-{
- struct kern_ipc_perm *isp = sma;
-
- isp->security = NULL;
+ return smk_curacc_shm(ipc, may);
}

/**
* smk_curacc_sem : check if current has access on sem
- * @sma : the object
+ * @isp : the object
* @access : access requested
*
* Returns 0 if current has the requested access, error code otherwise
*/
-static int smk_curacc_sem(struct kern_ipc_perm *sma, int access)
+static int smk_curacc_sem(struct kern_ipc_perm *isp, int access)
{
- struct smack_known *ssp = smack_of_sem(sma);
+ struct smack_known *ssp = smack_of_ipc(isp);
struct smk_audit_info ad;
int rc;

#ifdef CONFIG_AUDIT
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
- ad.a.u.ipc_id = sma->id;
+ ad.a.u.ipc_id = isp->id;
#endif
rc = smk_curacc(ssp, access, &ad);
rc = smk_bu_current("sem", ssp, access, rc);
@@ -3134,27 +3092,27 @@ static int smk_curacc_sem(struct kern_ipc_perm *sma, int access)

/**
* smack_sem_associate - Smack access check for sem
- * @sma: the object
+ * @isp: the object
* @semflg: access requested
*
* Returns 0 if current has the requested access, error code otherwise
*/
-static int smack_sem_associate(struct kern_ipc_perm *sma, int semflg)
+static int smack_sem_associate(struct kern_ipc_perm *isp, int semflg)
{
int may;

may = smack_flags_to_may(semflg);
- return smk_curacc_sem(sma, may);
+ return smk_curacc_sem(isp, may);
}

/**
* smack_sem_shmctl - Smack access check for sem
- * @sma: the object
+ * @isp: the object
* @cmd: what it wants to do
*
* Returns 0 if current has the requested access, error code otherwise
*/
-static int smack_sem_semctl(struct kern_ipc_perm *sma, int cmd)
+static int smack_sem_semctl(struct kern_ipc_perm *isp, int cmd)
{
int may;

@@ -3184,12 +3142,12 @@ static int smack_sem_semctl(struct kern_ipc_perm *sma, int cmd)
return -EINVAL;
}

- return smk_curacc_sem(sma, may);
+ return smk_curacc_sem(isp, may);
}

/**
* smack_sem_semop - Smack checks of semaphore operations
- * @sma: the object
+ * @isp: the object
* @sops: unused
* @nsops: unused
* @alter: unused
@@ -3198,67 +3156,28 @@ static int smack_sem_semctl(struct kern_ipc_perm *sma, int cmd)
*
* Returns 0 if access is allowed, error code otherwise
*/
-static int smack_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops,
+static int smack_sem_semop(struct kern_ipc_perm *isp, struct sembuf *sops,
unsigned nsops, int alter)
{
- return smk_curacc_sem(sma, MAY_READWRITE);
-}
-
-/**
- * smack_msg_alloc_security - Set the security blob for msg
- * @msq: the object
- *
- * Returns 0
- */
-static int smack_msg_queue_alloc_security(struct kern_ipc_perm *msq)
-{
- struct kern_ipc_perm *kisp = msq;
- struct smack_known *skp = smk_of_current();
-
- kisp->security = skp;
- return 0;
-}
-
-/**
- * smack_msg_free_security - Clear the security blob for msg
- * @msq: the object
- *
- * Clears the blob pointer
- */
-static void smack_msg_queue_free_security(struct kern_ipc_perm *msq)
-{
- struct kern_ipc_perm *kisp = msq;
-
- kisp->security = NULL;
-}
-
-/**
- * smack_of_msq - the smack pointer for the msq
- * @msq: the object
- *
- * Returns a pointer to the smack label entry
- */
-static struct smack_known *smack_of_msq(struct kern_ipc_perm *msq)
-{
- return (struct smack_known *)msq->security;
+ return smk_curacc_sem(isp, MAY_READWRITE);
}

/**
* smk_curacc_msq : helper to check if current has access on msq
- * @msq : the msq
+ * @isp : the msq
* @access : access requested
*
* return 0 if current has access, error otherwise
*/
-static int smk_curacc_msq(struct kern_ipc_perm *msq, int access)
+static int smk_curacc_msq(struct kern_ipc_perm *isp, int access)
{
- struct smack_known *msp = smack_of_msq(msq);
+ struct smack_known *msp = smack_of_ipc(isp);
struct smk_audit_info ad;
int rc;

#ifdef CONFIG_AUDIT
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
- ad.a.u.ipc_id = msq->id;
+ ad.a.u.ipc_id = isp->id;
#endif
rc = smk_curacc(msp, access, &ad);
rc = smk_bu_current("msq", msp, access, rc);
@@ -3267,27 +3186,27 @@ static int smk_curacc_msq(struct kern_ipc_perm *msq, int access)

/**
* smack_msg_queue_associate - Smack access check for msg_queue
- * @msq: the object
+ * @isp: the object
* @msqflg: access requested
*
* Returns 0 if current has the requested access, error code otherwise
*/
-static int smack_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg)
+static int smack_msg_queue_associate(struct kern_ipc_perm *isp, int msqflg)
{
int may;

may = smack_flags_to_may(msqflg);
- return smk_curacc_msq(msq, may);
+ return smk_curacc_msq(isp, may);
}

/**
* smack_msg_queue_msgctl - Smack access check for msg_queue
- * @msq: the object
+ * @isp: the object
* @cmd: what it wants to do
*
* Returns 0 if current has the requested access, error code otherwise
*/
-static int smack_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd)
+static int smack_msg_queue_msgctl(struct kern_ipc_perm *isp, int cmd)
{
int may;

@@ -3310,29 +3229,29 @@ static int smack_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd)
return -EINVAL;
}

- return smk_curacc_msq(msq, may);
+ return smk_curacc_msq(isp, may);
}

/**
* smack_msg_queue_msgsnd - Smack access check for msg_queue
- * @msq: the object
+ * @isp: the object
* @msg: unused
* @msqflg: access requested
*
* Returns 0 if current has the requested access, error code otherwise
*/
-static int smack_msg_queue_msgsnd(struct kern_ipc_perm *msq, struct msg_msg *msg,
+static int smack_msg_queue_msgsnd(struct kern_ipc_perm *isp, struct msg_msg *msg,
int msqflg)
{
int may;

may = smack_flags_to_may(msqflg);
- return smk_curacc_msq(msq, may);
+ return smk_curacc_msq(isp, may);
}

/**
* smack_msg_queue_msgsnd - Smack access check for msg_queue
- * @msq: the object
+ * @isp: the object
* @msg: unused
* @target: unused
* @type: unused
@@ -3340,10 +3259,10 @@ static int smack_msg_queue_msgsnd(struct kern_ipc_perm *msq, struct msg_msg *msg
*
* Returns 0 if current has read and write access, error code otherwise
*/
-static int smack_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg,
+static int smack_msg_queue_msgrcv(struct kern_ipc_perm *isp, struct msg_msg *msg,
struct task_struct *target, long type, int mode)
{
- return smk_curacc_msq(msq, MAY_READWRITE);
+ return smk_curacc_msq(isp, MAY_READWRITE);
}

/**
@@ -4756,21 +4675,21 @@ static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security),
LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security),

- LSM_HOOK_INIT(msg_queue_alloc_security, smack_msg_queue_alloc_security),
- LSM_HOOK_INIT(msg_queue_free_security, smack_msg_queue_free_security),
+ LSM_HOOK_INIT(msg_queue_alloc_security, smack_ipc_alloc_security),
+ LSM_HOOK_INIT(msg_queue_free_security, smack_ipc_free_security),
LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate),
LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl),
LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd),
LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv),

- LSM_HOOK_INIT(shm_alloc_security, smack_shm_alloc_security),
- LSM_HOOK_INIT(shm_free_security, smack_shm_free_security),
+ LSM_HOOK_INIT(shm_alloc_security, smack_ipc_alloc_security),
+ LSM_HOOK_INIT(shm_free_security, smack_ipc_free_security),
LSM_HOOK_INIT(shm_associate, smack_shm_associate),
LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl),
LSM_HOOK_INIT(shm_shmat, smack_shm_shmat),

- LSM_HOOK_INIT(sem_alloc_security, smack_sem_alloc_security),
- LSM_HOOK_INIT(sem_free_security, smack_sem_free_security),
+ LSM_HOOK_INIT(sem_alloc_security, smack_ipc_alloc_security),
+ LSM_HOOK_INIT(sem_free_security, smack_ipc_free_security),
LSM_HOOK_INIT(sem_associate, smack_sem_associate),
LSM_HOOK_INIT(sem_semctl, smack_sem_semctl),
LSM_HOOK_INIT(sem_semop, smack_sem_semop),
--
2.14.1
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