sanitize audit_mq_getsetattr()

* get rid of allocations
* make it return void
* don't duplicate parts of audit_dummy_context()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

3 files changed, 22 insertions, 47 deletions

diff --git a/include/linux/audit.h b/include/linux/audit.h
index b7abfe0d6737..b7707e577b80 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -454,7 +454,7 @@ extern int __audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr
 extern int __audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec __user *u_abs_timeout);
 extern int __audit_mq_timedreceive(mqd_t mqdes, size_t msg_len, unsigned int __user *u_msg_prio, const struct timespec __user *u_abs_timeout);
 extern int __audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_notification);
-extern int __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);
+extern void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);
 extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
                                   const struct cred *new,
                                   const struct cred *old);
@@ -500,11 +500,10 @@ static inline int audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_n
                 return __audit_mq_notify(mqdes, u_notification);
         return 0;
 }
-static inline int audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
+static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
 {
         if (unlikely(!audit_dummy_context()))
-                return __audit_mq_getsetattr(mqdes, mqstat);
-        return 0;
+                __audit_mq_getsetattr(mqdes, mqstat);
 }
 
 static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
@@ -555,7 +554,7 @@ extern int audit_signals;
 #define audit_mq_timedsend(d,l,p,t) ({ 0; })
 #define audit_mq_timedreceive(d,l,p,t) ({ 0; })
 #define audit_mq_notify(d,n) ({ 0; })
-#define audit_mq_getsetattr(d,s) ({ 0; })
+#define audit_mq_getsetattr(d,s) ((void)0)
 #define audit_log_bprm_fcaps(b, ncr, ocr) ({ 0; })
 #define audit_log_capset(pid, ncr, ocr) ({ 0; })
 #define audit_ptrace(t) ((void)0)
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index d9393f8e4c3e..7563611c6615 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -1150,11 +1150,7 @@ asmlinkage long sys_mq_getsetattr(mqd_t mqdes,
         omqstat = info->attr;
         omqstat.mq_flags = filp->f_flags & O_NONBLOCK;
         if (u_mqstat) {
-                ret = audit_mq_getsetattr(mqdes, &mqstat);
-                if (ret != 0) {
-                        spin_unlock(&info->lock);
-                        goto out_fput;
-                }
+                audit_mq_getsetattr(mqdes, &mqstat);
                 if (mqstat.mq_flags & O_NONBLOCK)
                         filp->f_flags |= O_NONBLOCK;
                 else
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index fbed62e05bce..c50178c7e245 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -145,12 +145,6 @@ struct audit_aux_data_mq_notify {
         struct sigevent         notification;
 };
 
-struct audit_aux_data_mq_getsetattr {
-        struct audit_aux_data   d;
-        mqd_t                   mqdes;
-        struct mq_attr          mqstat;
-};
-
 struct audit_aux_data_execve {
         struct audit_aux_data   d;
         int argc;
@@ -248,6 +242,10 @@ struct audit_context {
                         mode_t                  perm_mode;
                         unsigned long           qbytes;
                 } ipc;
+                struct {
+                        mqd_t                   mqdes;
+                        struct mq_attr          mqstat;
+                } mq_getsetattr;
         };
 
 #if AUDIT_DEBUG
@@ -1269,6 +1267,15 @@ static void show_special(struct audit_context *context, int *call_panic)
                                 return;
                 }
                 break; }
+        case AUDIT_MQ_GETSETATTR: {
+                struct mq_attr *attr = &context->mq_getsetattr.mqstat;
+                audit_log_format(ab,
+                        "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld "
+                        "mq_curmsgs=%ld ",
+                        context->mq_getsetattr.mqdes,
+                        attr->mq_flags, attr->mq_maxmsg,
+                        attr->mq_msgsize, attr->mq_curmsgs);
+                break; }
         }
         audit_log_end(ab);
 }
@@ -1377,16 +1384,6 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
                                 axi->notification.sigev_signo);
                         break; }
 
-                case AUDIT_MQ_GETSETATTR: {
-                        struct audit_aux_data_mq_getsetattr *axi = (void *)aux;
-                        audit_log_format(ab,
-                                "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld "
-                                "mq_curmsgs=%ld ",
-                                axi->mqdes,
-                                axi->mqstat.mq_flags, axi->mqstat.mq_maxmsg,
-                                axi->mqstat.mq_msgsize, axi->mqstat.mq_curmsgs);
-                        break; }
-
                 case AUDIT_EXECVE: {
                         struct audit_aux_data_execve *axi = (void *)aux;
                         audit_log_execve_info(context, &ab, axi);
@@ -2316,30 +2313,13 @@ int __audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_notification)
  * @mqdes: MQ descriptor
  * @mqstat: MQ flags
  *
- * Returns 0 for success or NULL context or < 0 on error.
  */
-int __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
+void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
 {
-        struct audit_aux_data_mq_getsetattr *ax;
         struct audit_context *context = current->audit_context;
-
-        if (!audit_enabled)
-                return 0;
-
-        if (likely(!context))
-                return 0;
-
-        ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
-        if (!ax)
-                return -ENOMEM;
-
-        ax->mqdes = mqdes;
-        ax->mqstat = *mqstat;
-
-        ax->d.type = AUDIT_MQ_GETSETATTR;
-        ax->d.next = context->aux;
-        context->aux = (void *)ax;
-        return 0;
+        context->mq_getsetattr.mqdes = mqdes;
+        context->mq_getsetattr.mqstat = *mqstat;
+        context->type = AUDIT_MQ_GETSETATTR;
 }
 
 /**