selinux: move user accesses in selinuxfs out of locked regions

[sfrench/cifs-2.6.git] / security / selinux / selinuxfs.c

diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index 4be683eeba018d89aa488d156fdaa31d83485750..19e35dd695d7a4efda74b270a00ceb1e074ab7cc 100644 (file)
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -168,10 +168,12 @@ static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
                if (length)
                        goto out;
                audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
-                       "enforcing=%d old_enforcing=%d auid=%u ses=%u",
+                       "enforcing=%d old_enforcing=%d auid=%u ses=%u"
+                       " enabled=%d old-enabled=%d lsm=selinux res=1",
                        new_value, old_value,
                        from_kuid(&init_user_ns, audit_get_loginuid(current)),
-                       audit_get_sessionid(current));
+                       audit_get_sessionid(current),
+                       selinux_enabled, selinux_enabled);
                enforcing_set(state, new_value);
                if (new_value)
                        avc_ss_reset(state->avc, 0);
@@ -279,6 +281,7 @@ static ssize_t sel_write_disable(struct file *file, const char __user *buf,
        char *page;
        ssize_t length;
        int new_value;
+       int enforcing;
 
        if (count >= PAGE_SIZE)
                return -ENOMEM;
@@ -296,13 +299,16 @@ static ssize_t sel_write_disable(struct file *file, const char __user *buf,
                goto out;
 
        if (new_value) {
+               enforcing = enforcing_enabled(fsi->state);
                length = selinux_disable(fsi->state);
                if (length)
                        goto out;
                audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
-                       "selinux=0 auid=%u ses=%u",
+                       "enforcing=%d old_enforcing=%d auid=%u ses=%u"
+                       " enabled=%d old-enabled=%d lsm=selinux res=1",
+                       enforcing, enforcing,
                        from_kuid(&init_user_ns, audit_get_loginuid(current)),
-                       audit_get_sessionid(current));
+                       audit_get_sessionid(current), 0, 1);
        }
 
        length = count;
@@ -435,25 +441,19 @@ static int sel_release_policy(struct inode *inode, struct file *filp)
 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
                               size_t count, loff_t *ppos)
 {
-       struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
        struct policy_load_memory *plm = filp->private_data;
        int ret;
 
-       mutex_lock(&fsi->mutex);
-
        ret = avc_has_perm(&selinux_state,
                           current_sid(), SECINITSID_SECURITY,
                          SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
        if (ret)
-               goto out;
+               return ret;
 
-       ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
-out:
-       mutex_unlock(&fsi->mutex);
-       return ret;
+       return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
 }
 
-static int sel_mmap_policy_fault(struct vm_fault *vmf)
+static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf)
 {
        struct policy_load_memory *plm = vmf->vma->vm_file->private_data;
        unsigned long offset;
@@ -576,7 +576,7 @@ static ssize_t sel_write_load(struct file *file, const char __user *buf,
 
 out1:
        audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
-               "policy loaded auid=%u ses=%u",
+               "auid=%u ses=%u lsm=selinux res=1",
                from_kuid(&init_user_ns, audit_get_loginuid(current)),
                audit_get_sessionid(current));
 out:
@@ -1182,25 +1182,29 @@ static ssize_t sel_read_bool(struct file *filep, char __user *buf,
        ret = -EINVAL;
        if (index >= fsi->bool_num || strcmp(name,
                                             fsi->bool_pending_names[index]))
-               goto out;
+               goto out_unlock;
 
        ret = -ENOMEM;
        page = (char *)get_zeroed_page(GFP_KERNEL);
        if (!page)
-               goto out;
+               goto out_unlock;
 
        cur_enforcing = security_get_bool_value(fsi->state, index);
        if (cur_enforcing < 0) {
                ret = cur_enforcing;
-               goto out;
+               goto out_unlock;
        }
        length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
                          fsi->bool_pending_values[index]);
-       ret = simple_read_from_buffer(buf, count, ppos, page, length);
-out:
        mutex_unlock(&fsi->mutex);
+       ret = simple_read_from_buffer(buf, count, ppos, page, length);
+out_free:
        free_page((unsigned long)page);
        return ret;
+
+out_unlock:
+       mutex_unlock(&fsi->mutex);
+       goto out_free;
 }
 
 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
@@ -1213,6 +1217,17 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
        unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
        const char *name = filep->f_path.dentry->d_name.name;
 
+       if (count >= PAGE_SIZE)
+               return -ENOMEM;
+
+       /* No partial writes. */
+       if (*ppos != 0)
+               return -EINVAL;
+
+       page = memdup_user_nul(buf, count);
+       if (IS_ERR(page))
+               return PTR_ERR(page);
+
        mutex_lock(&fsi->mutex);
 
        length = avc_has_perm(&selinux_state,
@@ -1227,22 +1242,6 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
                                             fsi->bool_pending_names[index]))
                goto out;
 
-       length = -ENOMEM;
-       if (count >= PAGE_SIZE)
-               goto out;
-
-       /* No partial writes. */
-       length = -EINVAL;
-       if (*ppos != 0)
-               goto out;
-
-       page = memdup_user_nul(buf, count);
-       if (IS_ERR(page)) {
-               length = PTR_ERR(page);
-               page = NULL;
-               goto out;
-       }
-
        length = -EINVAL;
        if (sscanf(page, "%d", &new_value) != 1)
                goto out;
@@ -1274,6 +1273,17 @@ static ssize_t sel_commit_bools_write(struct file *filep,
        ssize_t length;
        int new_value;
 
+       if (count >= PAGE_SIZE)
+               return -ENOMEM;
+
+       /* No partial writes. */
+       if (*ppos != 0)
+               return -EINVAL;
+
+       page = memdup_user_nul(buf, count);
+       if (IS_ERR(page))
+               return PTR_ERR(page);
+
        mutex_lock(&fsi->mutex);
 
        length = avc_has_perm(&selinux_state,
@@ -1283,22 +1293,6 @@ static ssize_t sel_commit_bools_write(struct file *filep,
        if (length)
                goto out;
 
-       length = -ENOMEM;
-       if (count >= PAGE_SIZE)
-               goto out;
-
-       /* No partial writes. */
-       length = -EINVAL;
-       if (*ppos != 0)
-               goto out;
-
-       page = memdup_user_nul(buf, count);
-       if (IS_ERR(page)) {
-               length = PTR_ERR(page);
-               page = NULL;
-               goto out;
-       }
-
        length = -EINVAL;
        if (sscanf(page, "%d", &new_value) != 1)
                goto out;
@@ -2061,6 +2055,7 @@ __initcall(init_sel_fs);
 void exit_sel_fs(void)
 {
        sysfs_remove_mount_point(fs_kobj, "selinux");
+       dput(selinux_null.dentry);
        kern_unmount(selinuxfs_mount);
        unregister_filesystem(&sel_fs_type);
 }