From d8c6e8543294428426578d74dc7aaf121e762d58 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Thu, 22 Mar 2018 21:22:26 -0500 Subject: msg/security: Pass kern_ipc_perm not msg_queue into the msg_queue security hooks 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" --- include/linux/lsm_hooks.h | 12 ++++++------ include/linux/security.h | 25 ++++++++++++------------- ipc/msg.c | 18 ++++++++---------- security/security.c | 12 ++++++------ security/selinux/hooks.c | 36 ++++++++++++++++++------------------ security/smack/smack_lsm.c | 24 ++++++++++++------------ 6 files changed, 62 insertions(+), 65 deletions(-) diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h index cac7a8082c43..bde167fa2c51 100644 --- a/include/linux/lsm_hooks.h +++ b/include/linux/lsm_hooks.h @@ -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); diff --git a/include/linux/security.h b/include/linux/security.h index f390755808ea..128e1e4a5346 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -50,7 +50,6 @@ struct iattr; struct fown_struct; struct file_operations; struct msg_msg; -struct msg_queue; struct xattr; struct xfrm_sec_ctx; struct mm_struct; @@ -353,13 +352,13 @@ int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag); void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid); int security_msg_msg_alloc(struct msg_msg *msg); void security_msg_msg_free(struct msg_msg *msg); -int security_msg_queue_alloc(struct msg_queue *msq); -void security_msg_queue_free(struct msg_queue *msq); -int security_msg_queue_associate(struct msg_queue *msq, int msqflg); -int security_msg_queue_msgctl(struct msg_queue *msq, int cmd); -int security_msg_queue_msgsnd(struct msg_queue *msq, +int security_msg_queue_alloc(struct kern_ipc_perm *msq); +void security_msg_queue_free(struct kern_ipc_perm *msq); +int security_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg); +int security_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd); +int security_msg_queue_msgsnd(struct kern_ipc_perm *msq, struct msg_msg *msg, int msqflg); -int security_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, +int security_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg, struct task_struct *target, long type, int mode); int security_shm_alloc(struct kern_ipc_perm *shp); void security_shm_free(struct kern_ipc_perm *shp); @@ -1043,32 +1042,32 @@ static inline int security_msg_msg_alloc(struct msg_msg *msg) static inline void security_msg_msg_free(struct msg_msg *msg) { } -static inline int security_msg_queue_alloc(struct msg_queue *msq) +static inline int security_msg_queue_alloc(struct kern_ipc_perm *msq) { return 0; } -static inline void security_msg_queue_free(struct msg_queue *msq) +static inline void security_msg_queue_free(struct kern_ipc_perm *msq) { } -static inline int security_msg_queue_associate(struct msg_queue *msq, +static inline int security_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg) { return 0; } -static inline int security_msg_queue_msgctl(struct msg_queue *msq, int cmd) +static inline int security_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd) { return 0; } -static inline int security_msg_queue_msgsnd(struct msg_queue *msq, +static inline int security_msg_queue_msgsnd(struct kern_ipc_perm *msq, struct msg_msg *msg, int msqflg) { return 0; } -static inline int security_msg_queue_msgrcv(struct msg_queue *msq, +static inline int security_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg, struct task_struct *target, long type, int mode) diff --git a/ipc/msg.c b/ipc/msg.c index 0dcc6699dc53..cdfab0825fce 100644 --- a/ipc/msg.c +++ b/ipc/msg.c @@ -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; diff --git a/security/security.c b/security/security.c index 77b69bd6f234..02d734e69955 100644 --- a/security/security.c +++ b/security/security.c @@ -1163,33 +1163,33 @@ void security_msg_msg_free(struct msg_msg *msg) call_void_hook(msg_msg_free_security, msg); } -int security_msg_queue_alloc(struct msg_queue *msq) +int security_msg_queue_alloc(struct kern_ipc_perm *msq) { return call_int_hook(msg_queue_alloc_security, 0, msq); } -void security_msg_queue_free(struct msg_queue *msq) +void security_msg_queue_free(struct kern_ipc_perm *msq) { call_void_hook(msg_queue_free_security, msq); } -int security_msg_queue_associate(struct msg_queue *msq, int msqflg) +int security_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg) { return call_int_hook(msg_queue_associate, 0, msq, msqflg); } -int security_msg_queue_msgctl(struct msg_queue *msq, int cmd) +int security_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd) { return call_int_hook(msg_queue_msgctl, 0, msq, cmd); } -int security_msg_queue_msgsnd(struct msg_queue *msq, +int security_msg_queue_msgsnd(struct kern_ipc_perm *msq, struct msg_msg *msg, int msqflg) { return call_int_hook(msg_queue_msgsnd, 0, msq, msg, msqflg); } -int security_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, +int security_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg, struct task_struct *target, long type, int mode) { return call_int_hook(msg_queue_msgrcv, 0, msq, msg, target, type, mode); diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 14f9e6c08273..925e546b5a87 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -5532,52 +5532,52 @@ static void selinux_msg_msg_free_security(struct msg_msg *msg) } /* message queue security operations */ -static int selinux_msg_queue_alloc_security(struct msg_queue *msq) +static int selinux_msg_queue_alloc_security(struct kern_ipc_perm *msq) { struct ipc_security_struct *isec; struct common_audit_data ad; u32 sid = current_sid(); int rc; - rc = ipc_alloc_security(&msq->q_perm, SECCLASS_MSGQ); + rc = ipc_alloc_security(msq, SECCLASS_MSGQ); if (rc) return rc; - isec = msq->q_perm.security; + isec = msq->security; ad.type = LSM_AUDIT_DATA_IPC; - ad.u.ipc_id = msq->q_perm.key; + ad.u.ipc_id = msq->key; rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, MSGQ__CREATE, &ad); if (rc) { - ipc_free_security(&msq->q_perm); + ipc_free_security(msq); return rc; } return 0; } -static void selinux_msg_queue_free_security(struct msg_queue *msq) +static void selinux_msg_queue_free_security(struct kern_ipc_perm *msq) { - ipc_free_security(&msq->q_perm); + ipc_free_security(msq); } -static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg) +static int selinux_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg) { struct ipc_security_struct *isec; struct common_audit_data ad; u32 sid = current_sid(); - isec = msq->q_perm.security; + isec = msq->security; ad.type = LSM_AUDIT_DATA_IPC; - ad.u.ipc_id = msq->q_perm.key; + ad.u.ipc_id = msq->key; return avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, MSGQ__ASSOCIATE, &ad); } -static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd) +static int selinux_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd) { int err; int perms; @@ -5602,11 +5602,11 @@ static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd) return 0; } - err = ipc_has_perm(&msq->q_perm, perms); + err = ipc_has_perm(msq, perms); return err; } -static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg) +static int selinux_msg_queue_msgsnd(struct kern_ipc_perm *msq, struct msg_msg *msg, int msqflg) { struct ipc_security_struct *isec; struct msg_security_struct *msec; @@ -5614,7 +5614,7 @@ static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, u32 sid = current_sid(); int rc; - isec = msq->q_perm.security; + isec = msq->security; msec = msg->security; /* @@ -5632,7 +5632,7 @@ static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, } ad.type = LSM_AUDIT_DATA_IPC; - ad.u.ipc_id = msq->q_perm.key; + ad.u.ipc_id = msq->key; /* Can this process write to the queue? */ rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, @@ -5649,7 +5649,7 @@ static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, return rc; } -static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, +static int selinux_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg, struct task_struct *target, long type, int mode) { @@ -5659,11 +5659,11 @@ static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, u32 sid = task_sid(target); int rc; - isec = msq->q_perm.security; + isec = msq->security; msec = msg->security; ad.type = LSM_AUDIT_DATA_IPC; - ad.u.ipc_id = msq->q_perm.key; + ad.u.ipc_id = msq->key; rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, MSGQ__READ, &ad); diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index a3398c7f32c9..d960c2ea8d79 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -3210,9 +3210,9 @@ static int smack_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops, * * Returns 0 */ -static int smack_msg_queue_alloc_security(struct msg_queue *msq) +static int smack_msg_queue_alloc_security(struct kern_ipc_perm *msq) { - struct kern_ipc_perm *kisp = &msq->q_perm; + struct kern_ipc_perm *kisp = msq; struct smack_known *skp = smk_of_current(); kisp->security = skp; @@ -3225,9 +3225,9 @@ static int smack_msg_queue_alloc_security(struct msg_queue *msq) * * Clears the blob pointer */ -static void smack_msg_queue_free_security(struct msg_queue *msq) +static void smack_msg_queue_free_security(struct kern_ipc_perm *msq) { - struct kern_ipc_perm *kisp = &msq->q_perm; + struct kern_ipc_perm *kisp = msq; kisp->security = NULL; } @@ -3238,9 +3238,9 @@ static void smack_msg_queue_free_security(struct msg_queue *msq) * * Returns a pointer to the smack label entry */ -static struct smack_known *smack_of_msq(struct msg_queue *msq) +static struct smack_known *smack_of_msq(struct kern_ipc_perm *msq) { - return (struct smack_known *)msq->q_perm.security; + return (struct smack_known *)msq->security; } /** @@ -3250,7 +3250,7 @@ static struct smack_known *smack_of_msq(struct msg_queue *msq) * * return 0 if current has access, error otherwise */ -static int smk_curacc_msq(struct msg_queue *msq, int access) +static int smk_curacc_msq(struct kern_ipc_perm *msq, int access) { struct smack_known *msp = smack_of_msq(msq); struct smk_audit_info ad; @@ -3258,7 +3258,7 @@ static int smk_curacc_msq(struct msg_queue *msq, int access) #ifdef CONFIG_AUDIT smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); - ad.a.u.ipc_id = msq->q_perm.id; + ad.a.u.ipc_id = msq->id; #endif rc = smk_curacc(msp, access, &ad); rc = smk_bu_current("msq", msp, access, rc); @@ -3272,7 +3272,7 @@ static int smk_curacc_msq(struct msg_queue *msq, int access) * * Returns 0 if current has the requested access, error code otherwise */ -static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) +static int smack_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg) { int may; @@ -3287,7 +3287,7 @@ static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) * * Returns 0 if current has the requested access, error code otherwise */ -static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) +static int smack_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd) { int may; @@ -3321,7 +3321,7 @@ static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) * * Returns 0 if current has the requested access, error code otherwise */ -static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, +static int smack_msg_queue_msgsnd(struct kern_ipc_perm *msq, struct msg_msg *msg, int msqflg) { int may; @@ -3340,7 +3340,7 @@ static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, * * Returns 0 if current has read and write access, error code otherwise */ -static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, +static int smack_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg, struct task_struct *target, long type, int mode) { return smk_curacc_msq(msq, MAY_READWRITE); -- cgit v1.2.3-59-g8ed1b