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Date: Fri, 26 Sep 2008 17:18:50 -0400
From: Eric Paris <eparis@...hat.com>
To: linux-kernel@...r.kernel.org, malware-list@...ts.printk.net
Subject: [RFC 4/11] fanotify: display group registration info
fanotify: display group registration info
From: Eric Paris <eparis@...hat.com>
new file /security/fanotify/[name]/info will display registration
information so a process can know if the group gives what it wants, needs
to be cleanup up, should be reused, etc etc.
Signed-off-by: Eric Paris <eparis@...hat.com>
---
fs/notify/Makefile | 2 +
fs/notify/fanotify.h | 4 ++
fs/notify/group.c | 7 ++++
fs/notify/info_user.c | 85 +++++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 97 insertions(+), 1 deletions(-)
create mode 100644 fs/notify/info_user.c
diff --git a/fs/notify/Makefile b/fs/notify/Makefile
index 21ca1da..01915f7 100644
--- a/fs/notify/Makefile
+++ b/fs/notify/Makefile
@@ -3,4 +3,4 @@ obj-$(CONFIG_INOTIFY_USER) += inotify_user.o
obj-$(CONFIG_DNOTIFY) += dnotify.o
-obj-$(CONFIG_FANOTIFY) += fanotify.o notification.o notification_user.o group.o group_user.o
+obj-$(CONFIG_FANOTIFY) += fanotify.o notification.o notification_user.o group.o group_user.o info_user.o
diff --git a/fs/notify/fanotify.h b/fs/notify/fanotify.h
index d6bc0c0..78d8be0 100644
--- a/fs/notify/fanotify.h
+++ b/fs/notify/fanotify.h
@@ -24,6 +24,7 @@ struct fanotify_group {
char *name; /* group name used for register/unregister matching */
struct dentry *subdir; /* pointer to fanotify/name dentry */
struct dentry *notification; /* pointer to fanotify/name/notification dentry */
+ struct dentry *info; /* pointer to fanotify/name/info dentry */
};
/*
@@ -66,6 +67,9 @@ extern struct list_head groups;
extern __init int fanotify_register_init(void);
extern __init int fanotify_register_uninit(void);
+extern int fanotify_info_user_destroy(struct fanotify_group *group);
+extern int fanotify_info_user_create(struct fanotify_group *group);
+
extern int fanotify_notification_user_destroy(struct fanotify_group *group);
extern int fanotify_notification_user_create(struct fanotify_group *group);
diff --git a/fs/notify/group.c b/fs/notify/group.c
index a7a4d7f..926d0a4 100644
--- a/fs/notify/group.c
+++ b/fs/notify/group.c
@@ -45,6 +45,7 @@ void fanotify_get_group(struct fanotify_group *group)
void fanotify_kill_group(struct fanotify_group *group)
{
fanotify_notification_user_destroy(group);
+ fanotify_info_user_destroy(group);
securityfs_remove(group->subdir);
group->subdir = NULL;
@@ -107,12 +108,18 @@ int fanotify_register_group(char *name, unsigned int mask)
if (rc)
goto out_clean_subdir;
+ rc = fanotify_info_user_create(group);
+ if (rc)
+ goto out_clean_notification;
+
/* add it */
list_add_rcu(&group->group_list, &groups);
mutex_unlock(&groups_mutex);
return 0;
+out_clean_notification:
+ fanotify_notification_user_destroy(group);
out_clean_subdir:
securityfs_remove(subdir);
out_free_name:
diff --git a/fs/notify/info_user.c b/fs/notify/info_user.c
new file mode 100644
index 0000000..21a4465
--- /dev/null
+++ b/fs/notify/info_user.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2008 Red Hat, Inc., Eric Paris <eparis@...hat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING. If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/dcache.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/gfp.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/mount.h>
+#include <linux/mutex.h>
+#include <linux/namei.h>
+#include <linux/poll.h>
+#include <linux/sched.h>
+#include <linux/security.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/wait.h>
+
+#include <linux/fanotify.h>
+#include "fanotify.h"
+
+static ssize_t fanotify_info_read(struct file *file, char __user *buf, size_t lenp, loff_t *offset)
+{
+ struct fanotify_group *group = file->f_path.dentry->d_inode->i_private;
+ int len;
+ char *output;
+
+ BUG_ON(!group);
+
+ output = (char *)get_zeroed_page(GFP_KERNEL);
+ if (!output)
+ return -ENOMEM;
+
+ /* Build metadata string to send to the listener */
+ len = snprintf(output, PAGE_SIZE, "%s %x\n", group->name, group->mask);
+ if (len < 0)
+ goto out;
+ len = simple_read_from_buffer(buf, lenp, offset, output, len);
+out:
+ free_page((unsigned long)output);
+ return len;
+}
+
+static struct file_operations info_fops = {
+ .read = fanotify_info_read,
+};
+
+int fanotify_info_user_destroy(struct fanotify_group *group)
+{
+ securityfs_remove(group->info);
+ group->info = NULL;
+
+ return 0;
+}
+
+int fanotify_info_user_create(struct fanotify_group *group)
+{
+ struct dentry *info_file;
+
+ group->info = NULL;
+
+ info_file = securityfs_create_file("info", S_IRUSR|S_IWUSR, group->subdir, group, &info_fops);
+ if (IS_ERR(info_file))
+ return PTR_ERR(info_file);
+
+ group->info = info_file;
+
+ return 0;
+}
--
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