SELinux: merge policydb_index_classes and policydb_index_others
[linux-2.6.git] / security / selinux / selinuxfs.c
index 0293843..45d35e6 100644 (file)
@@ -68,6 +68,8 @@ static int *bool_pending_values;
 static struct dentry *class_dir;
 static unsigned long last_class_ino;
 
+static char policy_opened;
+
 /* global data for policy capabilities */
 static struct dentry *policycap_dir;
 
@@ -110,6 +112,8 @@ enum sel_inos {
        SEL_COMPAT_NET, /* whether to use old compat network packet controls */
        SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
        SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
+       SEL_STATUS,     /* export current status using mmap() */
+       SEL_POLICY,     /* allow userspace to read the in kernel policy */
        SEL_INO_NEXT,   /* The next inode number to use */
 };
 
@@ -137,19 +141,24 @@ static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
                                 size_t count, loff_t *ppos)
 
 {
-       char *page;
+       char *page = NULL;
        ssize_t length;
        int new_value;
 
+       length = -ENOMEM;
        if (count >= PAGE_SIZE)
-               return -ENOMEM;
-       if (*ppos != 0) {
-               /* No partial writes. */
-               return -EINVAL;
-       }
+               goto out;
+
+       /* No partial writes. */
+       length = EINVAL;
+       if (*ppos != 0)
+               goto out;
+
+       length = -ENOMEM;
        page = (char *)get_zeroed_page(GFP_KERNEL);
        if (!page)
-               return -ENOMEM;
+               goto out;
+
        length = -EFAULT;
        if (copy_from_user(page, buf, count))
                goto out;
@@ -171,6 +180,7 @@ static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
                if (selinux_enforcing)
                        avc_ss_reset(0);
                selnl_notify_setenforce(selinux_enforcing);
+               selinux_status_update_setenforce(selinux_enforcing);
        }
        length = count;
 out:
@@ -184,6 +194,7 @@ out:
 static const struct file_operations sel_enforce_ops = {
        .read           = sel_read_enforce,
        .write          = sel_write_enforce,
+       .llseek         = generic_file_llseek,
 };
 
 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
@@ -201,6 +212,60 @@ static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
 
 static const struct file_operations sel_handle_unknown_ops = {
        .read           = sel_read_handle_unknown,
+       .llseek         = generic_file_llseek,
+};
+
+static int sel_open_handle_status(struct inode *inode, struct file *filp)
+{
+       struct page    *status = selinux_kernel_status_page();
+
+       if (!status)
+               return -ENOMEM;
+
+       filp->private_data = status;
+
+       return 0;
+}
+
+static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
+                                     size_t count, loff_t *ppos)
+{
+       struct page    *status = filp->private_data;
+
+       BUG_ON(!status);
+
+       return simple_read_from_buffer(buf, count, ppos,
+                                      page_address(status),
+                                      sizeof(struct selinux_kernel_status));
+}
+
+static int sel_mmap_handle_status(struct file *filp,
+                                 struct vm_area_struct *vma)
+{
+       struct page    *status = filp->private_data;
+       unsigned long   size = vma->vm_end - vma->vm_start;
+
+       BUG_ON(!status);
+
+       /* only allows one page from the head */
+       if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
+               return -EIO;
+       /* disallow writable mapping */
+       if (vma->vm_flags & VM_WRITE)
+               return -EPERM;
+       /* disallow mprotect() turns it into writable */
+       vma->vm_flags &= ~VM_MAYWRITE;
+
+       return remap_pfn_range(vma, vma->vm_start,
+                              page_to_pfn(status),
+                              size, vma->vm_page_prot);
+}
+
+static const struct file_operations sel_handle_status_ops = {
+       .open           = sel_open_handle_status,
+       .read           = sel_read_handle_status,
+       .mmap           = sel_mmap_handle_status,
+       .llseek         = generic_file_llseek,
 };
 
 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
@@ -208,20 +273,25 @@ static ssize_t sel_write_disable(struct file *file, const char __user *buf,
                                 size_t count, loff_t *ppos)
 
 {
-       char *page;
+       char *page = NULL;
        ssize_t length;
        int new_value;
        extern int selinux_disable(void);
 
+       length = -ENOMEM;
        if (count >= PAGE_SIZE)
-               return -ENOMEM;
-       if (*ppos != 0) {
-               /* No partial writes. */
-               return -EINVAL;
-       }
+               goto out;;
+
+       /* No partial writes. */
+       length = -EINVAL;
+       if (*ppos != 0)
+               goto out;
+
+       length = -ENOMEM;
        page = (char *)get_zeroed_page(GFP_KERNEL);
        if (!page)
-               return -ENOMEM;
+               goto out;
+
        length = -EFAULT;
        if (copy_from_user(page, buf, count))
                goto out;
@@ -232,7 +302,7 @@ static ssize_t sel_write_disable(struct file *file, const char __user *buf,
 
        if (new_value) {
                length = selinux_disable();
-               if (length < 0)
+               if (length)
                        goto out;
                audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
                        "selinux=0 auid=%u ses=%u",
@@ -251,6 +321,7 @@ out:
 
 static const struct file_operations sel_disable_ops = {
        .write          = sel_write_disable,
+       .llseek         = generic_file_llseek,
 };
 
 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
@@ -265,6 +336,7 @@ static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
 
 static const struct file_operations sel_policyvers_ops = {
        .read           = sel_read_policyvers,
+       .llseek         = generic_file_llseek,
 };
 
 /* declaration for sel_write_load */
@@ -289,13 +361,148 @@ static ssize_t sel_read_mls(struct file *filp, char __user *buf,
 
 static const struct file_operations sel_mls_ops = {
        .read           = sel_read_mls,
+       .llseek         = generic_file_llseek,
+};
+
+struct policy_load_memory {
+       size_t len;
+       void *data;
+};
+
+static int sel_open_policy(struct inode *inode, struct file *filp)
+{
+       struct policy_load_memory *plm = NULL;
+       int rc;
+
+       BUG_ON(filp->private_data);
+
+       mutex_lock(&sel_mutex);
+
+       rc = task_has_security(current, SECURITY__READ_POLICY);
+       if (rc)
+               goto err;
+
+       rc = -EBUSY;
+       if (policy_opened)
+               goto err;
+
+       rc = -ENOMEM;
+       plm = kzalloc(sizeof(*plm), GFP_KERNEL);
+       if (!plm)
+               goto err;
+
+       if (i_size_read(inode) != security_policydb_len()) {
+               mutex_lock(&inode->i_mutex);
+               i_size_write(inode, security_policydb_len());
+               mutex_unlock(&inode->i_mutex);
+       }
+
+       rc = security_read_policy(&plm->data, &plm->len);
+       if (rc)
+               goto err;
+
+       policy_opened = 1;
+
+       filp->private_data = plm;
+
+       mutex_unlock(&sel_mutex);
+
+       return 0;
+err:
+       mutex_unlock(&sel_mutex);
+
+       if (plm)
+               vfree(plm->data);
+       kfree(plm);
+       return rc;
+}
+
+static int sel_release_policy(struct inode *inode, struct file *filp)
+{
+       struct policy_load_memory *plm = filp->private_data;
+
+       BUG_ON(!plm);
+
+       policy_opened = 0;
+
+       vfree(plm->data);
+       kfree(plm);
+
+       return 0;
+}
+
+static ssize_t sel_read_policy(struct file *filp, char __user *buf,
+                              size_t count, loff_t *ppos)
+{
+       struct policy_load_memory *plm = filp->private_data;
+       int ret;
+
+       mutex_lock(&sel_mutex);
+
+       ret = task_has_security(current, SECURITY__READ_POLICY);
+       if (ret)
+               goto out;
+
+       ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
+out:
+       mutex_unlock(&sel_mutex);
+       return ret;
+}
+
+static int sel_mmap_policy_fault(struct vm_area_struct *vma,
+                                struct vm_fault *vmf)
+{
+       struct policy_load_memory *plm = vma->vm_file->private_data;
+       unsigned long offset;
+       struct page *page;
+
+       if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
+               return VM_FAULT_SIGBUS;
+
+       offset = vmf->pgoff << PAGE_SHIFT;
+       if (offset >= roundup(plm->len, PAGE_SIZE))
+               return VM_FAULT_SIGBUS;
+
+       page = vmalloc_to_page(plm->data + offset);
+       get_page(page);
+
+       vmf->page = page;
+
+       return 0;
+}
+
+static struct vm_operations_struct sel_mmap_policy_ops = {
+       .fault = sel_mmap_policy_fault,
+       .page_mkwrite = sel_mmap_policy_fault,
+};
+
+int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
+{
+       if (vma->vm_flags & VM_SHARED) {
+               /* do not allow mprotect to make mapping writable */
+               vma->vm_flags &= ~VM_MAYWRITE;
+
+               if (vma->vm_flags & VM_WRITE)
+                       return -EACCES;
+       }
+
+       vma->vm_flags |= VM_RESERVED;
+       vma->vm_ops = &sel_mmap_policy_ops;
+
+       return 0;
+}
+
+static const struct file_operations sel_policy_ops = {
+       .open           = sel_open_policy,
+       .read           = sel_read_policy,
+       .mmap           = sel_mmap_policy,
+       .release        = sel_release_policy,
 };
 
 static ssize_t sel_write_load(struct file *file, const char __user *buf,
                              size_t count, loff_t *ppos)
 
 {
-       int ret;
        ssize_t length;
        void *data = NULL;
 
@@ -305,17 +512,19 @@ static ssize_t sel_write_load(struct file *file, const char __user *buf,
        if (length)
                goto out;
 
-       if (*ppos != 0) {
-               /* No partial writes. */
-               length = -EINVAL;
+       /* No partial writes. */
+       length = -EINVAL;
+       if (*ppos != 0)
                goto out;
-       }
 
-       if ((count > 64 * 1024 * 1024)
-           || (data = vmalloc(count)) == NULL) {
-               length = -ENOMEM;
+       length = -EFBIG;
+       if (count > 64 * 1024 * 1024)
+               goto out;
+
+       length = -ENOMEM;
+       data = vmalloc(count);
+       if (!data)
                goto out;
-       }
 
        length = -EFAULT;
        if (copy_from_user(data, buf, count) != 0)
@@ -325,23 +534,19 @@ static ssize_t sel_write_load(struct file *file, const char __user *buf,
        if (length)
                goto out;
 
-       ret = sel_make_bools();
-       if (ret) {
-               length = ret;
+       length = sel_make_bools();
+       if (length)
                goto out1;
-       }
 
-       ret = sel_make_classes();
-       if (ret) {
-               length = ret;
+       length = sel_make_classes();
+       if (length)
                goto out1;
-       }
 
-       ret = sel_make_policycap();
-       if (ret)
-               length = ret;
-       else
-               length = count;
+       length = sel_make_policycap();
+       if (length)
+               goto out1;
+
+       length = count;
 
 out1:
        audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
@@ -356,30 +561,31 @@ out:
 
 static const struct file_operations sel_load_ops = {
        .write          = sel_write_load,
+       .llseek         = generic_file_llseek,
 };
 
 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
 {
-       char *canon;
+       char *canon = NULL;
        u32 sid, len;
        ssize_t length;
 
        length = task_has_security(current, SECURITY__CHECK_CONTEXT);
        if (length)
-               return length;
+               goto out;
 
        length = security_context_to_sid(buf, size, &sid);
-       if (length < 0)
-               return length;
+       if (length)
+               goto out;
 
        length = security_sid_to_context(sid, &canon, &len);
-       if (length < 0)
-               return length;
+       if (length)
+               goto out;
 
+       length = -ERANGE;
        if (len > SIMPLE_TRANSACTION_LIMIT) {
                printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
                        "payload max\n", __func__, len);
-               length = -ERANGE;
                goto out;
        }
 
@@ -403,23 +609,28 @@ static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
                                      size_t count, loff_t *ppos)
 {
-       char *page;
+       char *page = NULL;
        ssize_t length;
        unsigned int new_value;
 
        length = task_has_security(current, SECURITY__SETCHECKREQPROT);
        if (length)
-               return length;
+               goto out;
 
+       length = -ENOMEM;
        if (count >= PAGE_SIZE)
-               return -ENOMEM;
-       if (*ppos != 0) {
-               /* No partial writes. */
-               return -EINVAL;
-       }
+               goto out;
+
+       /* No partial writes. */
+       length = -EINVAL;
+       if (*ppos != 0)
+               goto out;
+
+       length = -ENOMEM;
        page = (char *)get_zeroed_page(GFP_KERNEL);
        if (!page)
-               return -ENOMEM;
+               goto out;
+
        length = -EFAULT;
        if (copy_from_user(page, buf, count))
                goto out;
@@ -437,6 +648,7 @@ out:
 static const struct file_operations sel_checkreqprot_ops = {
        .read           = sel_read_checkreqprot,
        .write          = sel_write_checkreqprot,
+       .llseek         = generic_file_llseek,
 };
 
 /*
@@ -482,6 +694,7 @@ static const struct file_operations transaction_ops = {
        .write          = selinux_transaction_write,
        .read           = simple_transaction_read,
        .release        = simple_transaction_release,
+       .llseek         = generic_file_llseek,
 };
 
 /*
@@ -492,7 +705,7 @@ static const struct file_operations transaction_ops = {
 
 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
 {
-       char *scon, *tcon;
+       char *scon = NULL, *tcon = NULL;
        u32 ssid, tsid;
        u16 tclass;
        struct av_decision avd;
@@ -500,27 +713,29 @@ static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
 
        length = task_has_security(current, SECURITY__COMPUTE_AV);
        if (length)
-               return length;
+               goto out;
 
        length = -ENOMEM;
        scon = kzalloc(size + 1, GFP_KERNEL);
        if (!scon)
-               return length;
+               goto out;
 
+       length = -ENOMEM;
        tcon = kzalloc(size + 1, GFP_KERNEL);
        if (!tcon)
                goto out;
 
        length = -EINVAL;
        if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
-               goto out2;
+               goto out;
 
        length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
-       if (length < 0)
-               goto out2;
+       if (length)
+               goto out;
+
        length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
-       if (length < 0)
-               goto out2;
+       if (length)
+               goto out;
 
        security_compute_av_user(ssid, tsid, tclass, &avd);
 
@@ -529,133 +744,131 @@ static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
                          avd.allowed, 0xffffffff,
                          avd.auditallow, avd.auditdeny,
                          avd.seqno, avd.flags);
-out2:
-       kfree(tcon);
 out:
+       kfree(tcon);
        kfree(scon);
        return length;
 }
 
 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
 {
-       char *scon, *tcon;
+       char *scon = NULL, *tcon = NULL;
        u32 ssid, tsid, newsid;
        u16 tclass;
        ssize_t length;
-       char *newcon;
+       char *newcon = NULL;
        u32 len;
 
        length = task_has_security(current, SECURITY__COMPUTE_CREATE);
        if (length)
-               return length;
+               goto out;
 
        length = -ENOMEM;
        scon = kzalloc(size + 1, GFP_KERNEL);
        if (!scon)
-               return length;
+               goto out;
 
+       length = -ENOMEM;
        tcon = kzalloc(size + 1, GFP_KERNEL);
        if (!tcon)
                goto out;
 
        length = -EINVAL;
        if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
-               goto out2;
+               goto out;
 
        length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
-       if (length < 0)
-               goto out2;
+       if (length)
+               goto out;
+
        length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
-       if (length < 0)
-               goto out2;
+       if (length)
+               goto out;
 
        length = security_transition_sid_user(ssid, tsid, tclass, &newsid);
-       if (length < 0)
-               goto out2;
+       if (length)
+               goto out;
 
        length = security_sid_to_context(newsid, &newcon, &len);
-       if (length < 0)
-               goto out2;
+       if (length)
+               goto out;
 
+       length = -ERANGE;
        if (len > SIMPLE_TRANSACTION_LIMIT) {
                printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
                        "payload max\n", __func__, len);
-               length = -ERANGE;
-               goto out3;
+               goto out;
        }
 
        memcpy(buf, newcon, len);
        length = len;
-out3:
+out:
        kfree(newcon);
-out2:
        kfree(tcon);
-out:
        kfree(scon);
        return length;
 }
 
 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
 {
-       char *scon, *tcon;
+       char *scon = NULL, *tcon = NULL;
        u32 ssid, tsid, newsid;
        u16 tclass;
        ssize_t length;
-       char *newcon;
+       char *newcon = NULL;
        u32 len;
 
        length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
        if (length)
-               return length;
+               goto out;
 
        length = -ENOMEM;
        scon = kzalloc(size + 1, GFP_KERNEL);
        if (!scon)
-               return length;
+               goto out;
 
+       length = -ENOMEM;
        tcon = kzalloc(size + 1, GFP_KERNEL);
        if (!tcon)
                goto out;
 
        length = -EINVAL;
        if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
-               goto out2;
+               goto out;
 
        length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
-       if (length < 0)
-               goto out2;
+       if (length)
+               goto out;
+
        length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
-       if (length < 0)
-               goto out2;
+       if (length)
+               goto out;
 
        length = security_change_sid(ssid, tsid, tclass, &newsid);
-       if (length < 0)
-               goto out2;
+       if (length)
+               goto out;
 
        length = security_sid_to_context(newsid, &newcon, &len);
-       if (length < 0)
-               goto out2;
+       if (length)
+               goto out;
 
-       if (len > SIMPLE_TRANSACTION_LIMIT) {
-               length = -ERANGE;
-               goto out3;
-       }
+       length = -ERANGE;
+       if (len > SIMPLE_TRANSACTION_LIMIT)
+               goto out;
 
        memcpy(buf, newcon, len);
        length = len;
-out3:
+out:
        kfree(newcon);
-out2:
        kfree(tcon);
-out:
        kfree(scon);
        return length;
 }
 
 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
 {
-       char *con, *user, *ptr;
-       u32 sid, *sids;
+       char *con = NULL, *user = NULL, *ptr;
+       u32 sid, *sids = NULL;
        ssize_t length;
        char *newcon;
        int i, rc;
@@ -663,28 +876,29 @@ static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
 
        length = task_has_security(current, SECURITY__COMPUTE_USER);
        if (length)
-               return length;
+               goto out;;
 
        length = -ENOMEM;
        con = kzalloc(size + 1, GFP_KERNEL);
        if (!con)
-               return length;
+               goto out;;
 
+       length = -ENOMEM;
        user = kzalloc(size + 1, GFP_KERNEL);
        if (!user)
                goto out;
 
        length = -EINVAL;
        if (sscanf(buf, "%s %s", con, user) != 2)
-               goto out2;
+               goto out;
 
        length = security_context_to_sid(con, strlen(con) + 1, &sid);
-       if (length < 0)
-               goto out2;
+       if (length)
+               goto out;
 
        length = security_get_user_sids(sid, user, &sids, &nsids);
-       if (length < 0)
-               goto out2;
+       if (length)
+               goto out;
 
        length = sprintf(buf, "%u", nsids) + 1;
        ptr = buf + length;
@@ -692,82 +906,80 @@ static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
                rc = security_sid_to_context(sids[i], &newcon, &len);
                if (rc) {
                        length = rc;
-                       goto out3;
+                       goto out;
                }
                if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
                        kfree(newcon);
                        length = -ERANGE;
-                       goto out3;
+                       goto out;
                }
                memcpy(ptr, newcon, len);
                kfree(newcon);
                ptr += len;
                length += len;
        }
-out3:
+out:
        kfree(sids);
-out2:
        kfree(user);
-out:
        kfree(con);
        return length;
 }
 
 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
 {
-       char *scon, *tcon;
+       char *scon = NULL, *tcon = NULL;
        u32 ssid, tsid, newsid;
        u16 tclass;
        ssize_t length;
-       char *newcon;
+       char *newcon = NULL;
        u32 len;
 
        length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
        if (length)
-               return length;
+               goto out;
 
        length = -ENOMEM;
        scon = kzalloc(size + 1, GFP_KERNEL);
        if (!scon)
-               return length;
+               goto out;;
 
+       length = -ENOMEM;
        tcon = kzalloc(size + 1, GFP_KERNEL);
        if (!tcon)
                goto out;
 
        length = -EINVAL;
        if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
-               goto out2;
+               goto out;
 
        length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
-       if (length < 0)
-               goto out2;
+       if (length)
+               goto out;
+
        length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
-       if (length < 0)
-               goto out2;
+       if (length)
+               goto out;
 
        length = security_member_sid(ssid, tsid, tclass, &newsid);
-       if (length < 0)
-               goto out2;
+       if (length)
+               goto out;
 
        length = security_sid_to_context(newsid, &newcon, &len);
-       if (length < 0)
-               goto out2;
+       if (length)
+               goto out;
 
+       length = -ERANGE;
        if (len > SIMPLE_TRANSACTION_LIMIT) {
                printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
                        "payload max\n", __func__, len);
-               length = -ERANGE;
-               goto out3;
+               goto out;
        }
 
        memcpy(buf, newcon, len);
        length = len;
-out3:
+out:
        kfree(newcon);
-out2:
        kfree(tcon);
-out:
        kfree(scon);
        return length;
 }
@@ -796,16 +1008,14 @@ static ssize_t sel_read_bool(struct file *filep, char __user *buf,
 
        mutex_lock(&sel_mutex);
 
-       if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
-               ret = -EINVAL;
+       ret = -EINVAL;
+       if (index >= bool_num || strcmp(name, bool_pending_names[index]))
                goto out;
-       }
 
+       ret = -ENOMEM;
        page = (char *)get_zeroed_page(GFP_KERNEL);
-       if (!page) {
-               ret = -ENOMEM;
+       if (!page)
                goto out;
-       }
 
        cur_enforcing = security_get_bool_value(index);
        if (cur_enforcing < 0) {
@@ -817,8 +1027,7 @@ static ssize_t sel_read_bool(struct file *filep, char __user *buf,
        ret = simple_read_from_buffer(buf, count, ppos, page, length);
 out:
        mutex_unlock(&sel_mutex);
-       if (page)
-               free_page((unsigned long)page);
+       free_page((unsigned long)page);
        return ret;
 }
 
@@ -838,26 +1047,23 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
        if (length)
                goto out;
 
-       if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
-               length = -EINVAL;
+       length = -EINVAL;
+       if (index >= bool_num || strcmp(name, bool_pending_names[index]))
                goto out;
-       }
 
-       if (count >= PAGE_SIZE) {
-               length = -ENOMEM;
+       length = -ENOMEM;
+       if (count >= PAGE_SIZE)
                goto out;
-       }
 
-       if (*ppos != 0) {
-               /* No partial writes. */
-               length = -EINVAL;
+       /* No partial writes. */
+       length = -EINVAL;
+       if (*ppos != 0)
                goto out;
-       }
+
+       length = -ENOMEM;
        page = (char *)get_zeroed_page(GFP_KERNEL);
-       if (!page) {
-               length = -ENOMEM;
+       if (!page)
                goto out;
-       }
 
        length = -EFAULT;
        if (copy_from_user(page, buf, count))
@@ -875,14 +1081,14 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
 
 out:
        mutex_unlock(&sel_mutex);
-       if (page)
-               free_page((unsigned long) page);
+       free_page((unsigned long) page);
        return length;
 }
 
 static const struct file_operations sel_bool_ops = {
        .read           = sel_read_bool,
        .write          = sel_write_bool,
+       .llseek         = generic_file_llseek,
 };
 
 static ssize_t sel_commit_bools_write(struct file *filep,
@@ -899,19 +1105,19 @@ static ssize_t sel_commit_bools_write(struct file *filep,
        if (length)
                goto out;
 
-       if (count >= PAGE_SIZE) {
-               length = -ENOMEM;
+       length = -ENOMEM;
+       if (count >= PAGE_SIZE)
                goto out;
-       }
-       if (*ppos != 0) {
-               /* No partial writes. */
+
+       /* No partial writes. */
+       length = -EINVAL;
+       if (*ppos != 0)
                goto out;
-       }
+
+       length = -ENOMEM;
        page = (char *)get_zeroed_page(GFP_KERNEL);
-       if (!page) {
-               length = -ENOMEM;
+       if (!page)
                goto out;
-       }
 
        length = -EFAULT;
        if (copy_from_user(page, buf, count))
@@ -921,20 +1127,22 @@ static ssize_t sel_commit_bools_write(struct file *filep,
        if (sscanf(page, "%d", &new_value) != 1)
                goto out;
 
+       length = 0;
        if (new_value && bool_pending_values)
-               security_set_bools(bool_num, bool_pending_values);
+               length = security_set_bools(bool_num, bool_pending_values);
 
-       length = count;
+       if (!length)
+               length = count;
 
 out:
        mutex_unlock(&sel_mutex);
-       if (page)
-               free_page((unsigned long) page);
+       free_page((unsigned long) page);
        return length;
 }
 
 static const struct file_operations sel_commit_bools_ops = {
        .write          = sel_commit_bools_write,
+       .llseek         = generic_file_llseek,
 };
 
 static void sel_remove_entries(struct dentry *de)
@@ -965,7 +1173,7 @@ static void sel_remove_entries(struct dentry *de)
 
 static int sel_make_bools(void)
 {
-       int i, ret = 0;
+       int i, ret;
        ssize_t len;
        struct dentry *dentry = NULL;
        struct dentry *dir = bool_dir;
@@ -986,38 +1194,40 @@ static int sel_make_bools(void)
 
        sel_remove_entries(dir);
 
+       ret = -ENOMEM;
        page = (char *)get_zeroed_page(GFP_KERNEL);
        if (!page)
-               return -ENOMEM;
+               goto out;
 
        ret = security_get_bools(&num, &names, &values);
-       if (ret != 0)
+       if (ret)
                goto out;
 
        for (i = 0; i < num; i++) {
+               ret = -ENOMEM;
                dentry = d_alloc_name(dir, names[i]);
-               if (!dentry) {
-                       ret = -ENOMEM;
-                       goto err;
-               }
+               if (!dentry)
+                       goto out;
+
+               ret = -ENOMEM;
                inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
-               if (!inode) {
-                       ret = -ENOMEM;
-                       goto err;
-               }
+               if (!inode)
+                       goto out;
 
+               ret = -EINVAL;
                len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
-               if (len < 0) {
-                       ret = -EINVAL;
-                       goto err;
-               } else if (len >= PAGE_SIZE) {
-                       ret = -ENAMETOOLONG;
-                       goto err;
-               }
+               if (len < 0)
+                       goto out;
+
+               ret = -ENAMETOOLONG;
+               if (len >= PAGE_SIZE)
+                       goto out;
+
                isec = (struct inode_security_struct *)inode->i_security;
                ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
                if (ret)
-                       goto err;
+                       goto out;
+
                isec->sid = sid;
                isec->initialized = 1;
                inode->i_fop = &sel_bool_ops;
@@ -1027,10 +1237,12 @@ static int sel_make_bools(void)
        bool_num = num;
        bool_pending_names = names;
        bool_pending_values = values;
+
+       free_page((unsigned long)page);
+       return 0;
 out:
        free_page((unsigned long)page);
-       return ret;
-err:
+
        if (names) {
                for (i = 0; i < num; i++)
                        kfree(names[i]);
@@ -1038,8 +1250,8 @@ err:
        }
        kfree(values);
        sel_remove_entries(dir);
-       ret = -ENOMEM;
-       goto out;
+
+       return ret;
 }
 
 #define NULL_FILE_NAME "null"
@@ -1061,47 +1273,41 @@ static ssize_t sel_write_avc_cache_threshold(struct file *file,
                                             size_t count, loff_t *ppos)
 
 {
-       char *page;
+       char *page = NULL;
        ssize_t ret;
        int new_value;
 
-       if (count >= PAGE_SIZE) {
-               ret = -ENOMEM;
+       ret = task_has_security(current, SECURITY__SETSECPARAM);
+       if (ret)
                goto out;
-       }
 
-       if (*ppos != 0) {
-               /* No partial writes. */
-               ret = -EINVAL;
+       ret = -ENOMEM;
+       if (count >= PAGE_SIZE)
                goto out;
-       }
 
+       /* No partial writes. */
+       ret = -EINVAL;
+       if (*ppos != 0)
+               goto out;
+
+       ret = -ENOMEM;
        page = (char *)get_zeroed_page(GFP_KERNEL);
-       if (!page) {
-               ret = -ENOMEM;
+       if (!page)
                goto out;
-       }
 
-       if (copy_from_user(page, buf, count)) {
-               ret = -EFAULT;
-               goto out_free;
-       }
+       ret = -EFAULT;
+       if (copy_from_user(page, buf, count))
+               goto out;
 
-       if (sscanf(page, "%u", &new_value) != 1) {
-               ret = -EINVAL;
+       ret = -EINVAL;
+       if (sscanf(page, "%u", &new_value) != 1)
                goto out;
-       }
 
-       if (new_value != avc_cache_threshold) {
-               ret = task_has_security(current, SECURITY__SETSECPARAM);
-               if (ret)
-                       goto out_free;
-               avc_cache_threshold = new_value;
-       }
+       avc_cache_threshold = new_value;
+
        ret = count;
-out_free:
-       free_page((unsigned long)page);
 out:
+       free_page((unsigned long)page);
        return ret;
 }
 
@@ -1109,28 +1315,29 @@ static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
                                       size_t count, loff_t *ppos)
 {
        char *page;
-       ssize_t ret = 0;
+       ssize_t length;
 
        page = (char *)__get_free_page(GFP_KERNEL);
-       if (!page) {
-               ret = -ENOMEM;
-               goto out;
-       }
-       ret = avc_get_hash_stats(page);
-       if (ret >= 0)
-               ret = simple_read_from_buffer(buf, count, ppos, page, ret);
+       if (!page)
+               return -ENOMEM;
+
+       length = avc_get_hash_stats(page);
+       if (length >= 0)
+               length = simple_read_from_buffer(buf, count, ppos, page, length);
        free_page((unsigned long)page);
-out:
-       return ret;
+
+       return length;
 }
 
 static const struct file_operations sel_avc_cache_threshold_ops = {
        .read           = sel_read_avc_cache_threshold,
        .write          = sel_write_avc_cache_threshold,
+       .llseek         = generic_file_llseek,
 };
 
 static const struct file_operations sel_avc_hash_stats_ops = {
        .read           = sel_read_avc_hash_stats,
+       .llseek         = generic_file_llseek,
 };
 
 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
@@ -1201,7 +1408,7 @@ static const struct file_operations sel_avc_cache_stats_ops = {
 
 static int sel_make_avc_files(struct dentry *dir)
 {
-       int i, ret = 0;
+       int i;
        static struct tree_descr files[] = {
                { "cache_threshold",
                  &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
@@ -1216,22 +1423,19 @@ static int sel_make_avc_files(struct dentry *dir)
                struct dentry *dentry;
 
                dentry = d_alloc_name(dir, files[i].name);
-               if (!dentry) {
-                       ret = -ENOMEM;
-                       goto out;
-               }
+               if (!dentry)
+                       return -ENOMEM;
 
                inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
-               if (!inode) {
-                       ret = -ENOMEM;
-                       goto out;
-               }
+               if (!inode)
+                       return -ENOMEM;
+
                inode->i_fop = files[i].ops;
                inode->i_ino = ++sel_last_ino;
                d_add(dentry, inode);
        }
-out:
-       return ret;
+
+       return 0;
 }
 
 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
@@ -1245,7 +1449,7 @@ static ssize_t sel_read_initcon(struct file *file, char __user *buf,
        inode = file->f_path.dentry->d_inode;
        sid = inode->i_ino&SEL_INO_MASK;
        ret = security_sid_to_context(sid, &con, &len);
-       if (ret < 0)
+       if (ret)
                return ret;
 
        ret = simple_read_from_buffer(buf, count, ppos, con, len);
@@ -1255,32 +1459,30 @@ static ssize_t sel_read_initcon(struct file *file, char __user *buf,
 
 static const struct file_operations sel_initcon_ops = {
        .read           = sel_read_initcon,
+       .llseek         = generic_file_llseek,
 };
 
 static int sel_make_initcon_files(struct dentry *dir)
 {
-       int i, ret = 0;
+       int i;
 
        for (i = 1; i <= SECINITSID_NUM; i++) {
                struct inode *inode;
                struct dentry *dentry;
                dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
-               if (!dentry) {
-                       ret = -ENOMEM;
-                       goto out;
-               }
+               if (!dentry)
+                       return -ENOMEM;
 
                inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
-               if (!inode) {
-                       ret = -ENOMEM;
-                       goto out;
-               }
+               if (!inode)
+                       return -ENOMEM;
+
                inode->i_fop = &sel_initcon_ops;
                inode->i_ino = i|SEL_INITCON_INO_OFFSET;
                d_add(dentry, inode);
        }
-out:
-       return ret;
+
+       return 0;
 }
 
 static inline unsigned int sel_div(unsigned long a, unsigned long b)
@@ -1316,20 +1518,19 @@ static ssize_t sel_read_class(struct file *file, char __user *buf,
        unsigned long ino = file->f_path.dentry->d_inode->i_ino;
 
        page = (char *)__get_free_page(GFP_KERNEL);
-       if (!page) {
-               rc = -ENOMEM;
-               goto out;
-       }
+       if (!page)
+               return -ENOMEM;
 
        len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
        rc = simple_read_from_buffer(buf, count, ppos, page, len);
        free_page((unsigned long)page);
-out:
+
        return rc;
 }
 
 static const struct file_operations sel_class_ops = {
        .read           = sel_read_class,
+       .llseek         = generic_file_llseek,
 };
 
 static ssize_t sel_read_perm(struct file *file, char __user *buf,
@@ -1340,20 +1541,19 @@ static ssize_t sel_read_perm(struct file *file, char __user *buf,
        unsigned long ino = file->f_path.dentry->d_inode->i_ino;
 
        page = (char *)__get_free_page(GFP_KERNEL);
-       if (!page) {
-               rc = -ENOMEM;
-               goto out;
-       }
+       if (!page)
+               return -ENOMEM;
 
        len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
        rc = simple_read_from_buffer(buf, count, ppos, page, len);
        free_page((unsigned long)page);
-out:
+
        return rc;
 }
 
 static const struct file_operations sel_perm_ops = {
        .read           = sel_read_perm,
+       .llseek         = generic_file_llseek,
 };
 
 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
@@ -1372,44 +1572,43 @@ static ssize_t sel_read_policycap(struct file *file, char __user *buf,
 
 static const struct file_operations sel_policycap_ops = {
        .read           = sel_read_policycap,
+       .llseek         = generic_file_llseek,
 };
 
 static int sel_make_perm_files(char *objclass, int classvalue,
                                struct dentry *dir)
 {
-       int i, rc = 0, nperms;
+       int i, rc, nperms;
        char **perms;
 
        rc = security_get_permissions(objclass, &perms, &nperms);
        if (rc)
-               goto out;
+               return rc;
 
        for (i = 0; i < nperms; i++) {
                struct inode *inode;
                struct dentry *dentry;
 
+               rc = -ENOMEM;
                dentry = d_alloc_name(dir, perms[i]);
-               if (!dentry) {
-                       rc = -ENOMEM;
-                       goto out1;
-               }
+               if (!dentry)
+                       goto out;
 
+               rc = -ENOMEM;
                inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
-               if (!inode) {
-                       rc = -ENOMEM;
-                       goto out1;
-               }
+               if (!inode)
+                       goto out;
+
                inode->i_fop = &sel_perm_ops;
                /* i+1 since perm values are 1-indexed */
                inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
                d_add(dentry, inode);
        }
-
-out1:
+       rc = 0;
+out:
        for (i = 0; i < nperms; i++)
                kfree(perms[i]);
        kfree(perms);
-out:
        return rc;
 }
 
@@ -1421,34 +1620,27 @@ static int sel_make_class_dir_entries(char *classname, int index,
        int rc;
 
        dentry = d_alloc_name(dir, "index");
-       if (!dentry) {
-               rc = -ENOMEM;
-               goto out;
-       }
+       if (!dentry)
+               return -ENOMEM;
 
        inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
-       if (!inode) {
-               rc = -ENOMEM;
-               goto out;
-       }
+       if (!inode)
+               return -ENOMEM;
 
        inode->i_fop = &sel_class_ops;
        inode->i_ino = sel_class_to_ino(index);
        d_add(dentry, inode);
 
        dentry = d_alloc_name(dir, "perms");
-       if (!dentry) {
-               rc = -ENOMEM;
-               goto out;
-       }
+       if (!dentry)
+               return -ENOMEM;
 
        rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
        if (rc)
-               goto out;
+               return rc;
 
        rc = sel_make_perm_files(classname, index, dentry);
 
-out:
        return rc;
 }
 
@@ -1478,15 +1670,15 @@ static void sel_remove_classes(void)
 
 static int sel_make_classes(void)
 {
-       int rc = 0, nclasses, i;
+       int rc, nclasses, i;
        char **classes;
 
        /* delete any existing entries */
        sel_remove_classes();
 
        rc = security_get_classes(&classes, &nclasses);
-       if (rc < 0)
-               goto out;
+       if (rc)
+               return rc;
 
        /* +2 since classes are 1-indexed */
        last_class_ino = sel_class_to_ino(nclasses + 2);
@@ -1494,29 +1686,27 @@ static int sel_make_classes(void)
        for (i = 0; i < nclasses; i++) {
                struct dentry *class_name_dir;
 
+               rc = -ENOMEM;
                class_name_dir = d_alloc_name(class_dir, classes[i]);
-               if (!class_name_dir) {
-                       rc = -ENOMEM;
-                       goto out1;
-               }
+               if (!class_name_dir)
+                       goto out;
 
                rc = sel_make_dir(class_dir->d_inode, class_name_dir,
                                &last_class_ino);
                if (rc)
-                       goto out1;
+                       goto out;
 
                /* i+1 since class values are 1-indexed */
                rc = sel_make_class_dir_entries(classes[i], i + 1,
                                class_name_dir);
                if (rc)
-                       goto out1;
+                       goto out;
        }
-
-out1:
+       rc = 0;
+out:
        for (i = 0; i < nclasses; i++)
                kfree(classes[i]);
        kfree(classes);
-out:
        return rc;
 }
 
@@ -1553,14 +1743,12 @@ static int sel_make_policycap(void)
 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
                        unsigned long *ino)
 {
-       int ret = 0;
        struct inode *inode;
 
        inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
-       if (!inode) {
-               ret = -ENOMEM;
-               goto out;
-       }
+       if (!inode)
+               return -ENOMEM;
+
        inode->i_op = &simple_dir_inode_operations;
        inode->i_fop = &simple_dir_operations;
        inode->i_ino = ++(*ino);
@@ -1569,8 +1757,8 @@ static int sel_make_dir(struct inode *dir, struct dentry *dentry,
        d_add(dentry, inode);
        /* bump link count on parent directory, too */
        inc_nlink(dir);
-out:
-       return ret;
+
+       return 0;
 }
 
 static int sel_fill_super(struct super_block *sb, void *data, int silent)
@@ -1596,6 +1784,8 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent)
                [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
                [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
                [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
+               [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
+               [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUSR},
                /* last one */ {""}
        };
        ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
@@ -1604,11 +1794,10 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent)
 
        root_inode = sb->s_root->d_inode;
 
+       ret = -ENOMEM;
        dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
-       if (!dentry) {
-               ret = -ENOMEM;
+       if (!dentry)
                goto err;
-       }
 
        ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
        if (ret)
@@ -1616,17 +1805,16 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent)
 
        bool_dir = dentry;
 
+       ret = -ENOMEM;
        dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
-       if (!dentry) {
-               ret = -ENOMEM;
+       if (!dentry)
                goto err;
-       }
 
+       ret = -ENOMEM;
        inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
-       if (!inode) {
-               ret = -ENOMEM;
+       if (!inode)
                goto err;
-       }
+
        inode->i_ino = ++sel_last_ino;
        isec = (struct inode_security_struct *)inode->i_security;
        isec->sid = SECINITSID_DEVNULL;
@@ -1637,11 +1825,10 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent)
        d_add(dentry, inode);
        selinux_null = dentry;
 
+       ret = -ENOMEM;
        dentry = d_alloc_name(sb->s_root, "avc");
-       if (!dentry) {
-               ret = -ENOMEM;
+       if (!dentry)
                goto err;
-       }
 
        ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
        if (ret)
@@ -1651,11 +1838,10 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent)
        if (ret)
                goto err;
 
+       ret = -ENOMEM;
        dentry = d_alloc_name(sb->s_root, "initial_contexts");
-       if (!dentry) {
-               ret = -ENOMEM;
+       if (!dentry)
                goto err;
-       }
 
        ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
        if (ret)
@@ -1665,11 +1851,10 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent)
        if (ret)
                goto err;
 
+       ret = -ENOMEM;
        dentry = d_alloc_name(sb->s_root, "class");
-       if (!dentry) {
-               ret = -ENOMEM;
+       if (!dentry)
                goto err;
-       }
 
        ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
        if (ret)
@@ -1677,11 +1862,10 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent)
 
        class_dir = dentry;
 
+       ret = -ENOMEM;
        dentry = d_alloc_name(sb->s_root, "policy_capabilities");
-       if (!dentry) {
-               ret = -ENOMEM;
+       if (!dentry)
                goto err;
-       }
 
        ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
        if (ret)
@@ -1689,24 +1873,22 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent)
 
        policycap_dir = dentry;
 
-out:
-       return ret;
+       return 0;
 err:
        printk(KERN_ERR "SELinux: %s:  failed while creating inodes\n",
                __func__);
-       goto out;
+       return ret;
 }
 
-static int sel_get_sb(struct file_system_type *fs_type,
-                     int flags, const char *dev_name, void *data,
-                     struct vfsmount *mnt)
+static struct dentry *sel_mount(struct file_system_type *fs_type,
+                     int flags, const char *dev_name, void *data)
 {
-       return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
+       return mount_single(fs_type, flags, data, sel_fill_super);
 }
 
 static struct file_system_type sel_fs_type = {
        .name           = "selinuxfs",
-       .get_sb         = sel_get_sb,
+       .mount          = sel_mount,
        .kill_sb        = kill_litter_super,
 };
 
@@ -1719,14 +1901,16 @@ static int __init init_sel_fs(void)
        if (!selinux_enabled)
                return 0;
        err = register_filesystem(&sel_fs_type);
-       if (!err) {
-               selinuxfs_mount = kern_mount(&sel_fs_type);
-               if (IS_ERR(selinuxfs_mount)) {
-                       printk(KERN_ERR "selinuxfs:  could not mount!\n");
-                       err = PTR_ERR(selinuxfs_mount);
-                       selinuxfs_mount = NULL;
-               }
+       if (err)
+               return err;
+
+       selinuxfs_mount = kern_mount(&sel_fs_type);
+       if (IS_ERR(selinuxfs_mount)) {
+               printk(KERN_ERR "selinuxfs:  could not mount!\n");
+               err = PTR_ERR(selinuxfs_mount);
+               selinuxfs_mount = NULL;
        }
+
        return err;
 }