init android origin source code

1 files changed, 355 insertions, 0 deletions

diff --git a/ANDROID_3.4.5/security/apparmor/apparmorfs.c b/ANDROID_3.4.5/security/apparmor/apparmorfs.c
new file mode 100644
index 00000000..16c15ec6
--- /dev/null
+++ b/ANDROID_3.4.5/security/apparmor/apparmorfs.c
@@ -0,0 +1,355 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor /sys/kernel/security/apparmor interface functions
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2010 Canonical Ltd.
+ *
+ * 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, version 2 of the
+ * License.
+ */
+
+#include <linux/security.h>
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+#include <linux/namei.h>
+#include <linux/capability.h>
+
+#include "include/apparmor.h"
+#include "include/apparmorfs.h"
+#include "include/audit.h"
+#include "include/context.h"
+#include "include/policy.h"
+#include "include/resource.h"
+
+/**
+ * aa_simple_write_to_buffer - common routine for getting policy from user
+ * @op: operation doing the user buffer copy
+ * @userbuf: user buffer to copy data from  (NOT NULL)
+ * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size)
+ * @copy_size: size of data to copy from user buffer
+ * @pos: position write is at in the file (NOT NULL)
+ *
+ * Returns: kernel buffer containing copy of user buffer data or an
+ *          ERR_PTR on failure.
+ */
+static char *aa_simple_write_to_buffer(int op, const char __user *userbuf,
+				       size_t alloc_size, size_t copy_size,
+				       loff_t *pos)
+{
+	char *data;
+
+	BUG_ON(copy_size > alloc_size);
+
+	if (*pos != 0)
+		/* only writes from pos 0, that is complete writes */
+		return ERR_PTR(-ESPIPE);
+
+	/*
+	 * Don't allow profile load/replace/remove from profiles that don't
+	 * have CAP_MAC_ADMIN
+	 */
+	if (!aa_may_manage_policy(op))
+		return ERR_PTR(-EACCES);
+
+	/* freed by caller to simple_write_to_buffer */
+	data = kvmalloc(alloc_size);
+	if (data == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	if (copy_from_user(data, userbuf, copy_size)) {
+		kvfree(data);
+		return ERR_PTR(-EFAULT);
+	}
+
+	return data;
+}
+
+
+/* .load file hook fn to load policy */
+static ssize_t profile_load(struct file *f, const char __user *buf, size_t size,
+			    loff_t *pos)
+{
+	char *data;
+	ssize_t error;
+
+	data = aa_simple_write_to_buffer(OP_PROF_LOAD, buf, size, size, pos);
+
+	error = PTR_ERR(data);
+	if (!IS_ERR(data)) {
+		error = aa_replace_profiles(data, size, PROF_ADD);
+		kvfree(data);
+	}
+
+	return error;
+}
+
+static const struct file_operations aa_fs_profile_load = {
+	.write = profile_load,
+	.llseek = default_llseek,
+};
+
+/* .replace file hook fn to load and/or replace policy */
+static ssize_t profile_replace(struct file *f, const char __user *buf,
+			       size_t size, loff_t *pos)
+{
+	char *data;
+	ssize_t error;
+
+	data = aa_simple_write_to_buffer(OP_PROF_REPL, buf, size, size, pos);
+	error = PTR_ERR(data);
+	if (!IS_ERR(data)) {
+		error = aa_replace_profiles(data, size, PROF_REPLACE);
+		kvfree(data);
+	}
+
+	return error;
+}
+
+static const struct file_operations aa_fs_profile_replace = {
+	.write = profile_replace,
+	.llseek = default_llseek,
+};
+
+/* .remove file hook fn to remove loaded policy */
+static ssize_t profile_remove(struct file *f, const char __user *buf,
+			      size_t size, loff_t *pos)
+{
+	char *data;
+	ssize_t error;
+
+	/*
+	 * aa_remove_profile needs a null terminated string so 1 extra
+	 * byte is allocated and the copied data is null terminated.
+	 */
+	data = aa_simple_write_to_buffer(OP_PROF_RM, buf, size + 1, size, pos);
+
+	error = PTR_ERR(data);
+	if (!IS_ERR(data)) {
+		data[size] = 0;
+		error = aa_remove_profiles(data, size);
+		kvfree(data);
+	}
+
+	return error;
+}
+
+static const struct file_operations aa_fs_profile_remove = {
+	.write = profile_remove,
+	.llseek = default_llseek,
+};
+
+static int aa_fs_seq_show(struct seq_file *seq, void *v)
+{
+	struct aa_fs_entry *fs_file = seq->private;
+
+	if (!fs_file)
+		return 0;
+
+	switch (fs_file->v_type) {
+	case AA_FS_TYPE_BOOLEAN:
+		seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no");
+		break;
+	case AA_FS_TYPE_STRING:
+		seq_printf(seq, "%s\n", fs_file->v.string);
+		break;
+	case AA_FS_TYPE_U64:
+		seq_printf(seq, "%#08lx\n", fs_file->v.u64);
+		break;
+	default:
+		/* Ignore unpritable entry types. */
+		break;
+	}
+
+	return 0;
+}
+
+static int aa_fs_seq_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, aa_fs_seq_show, inode->i_private);
+}
+
+const struct file_operations aa_fs_seq_file_ops = {
+	.owner		= THIS_MODULE,
+	.open		= aa_fs_seq_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+/** Base file system setup **/
+
+static struct aa_fs_entry aa_fs_entry_file[] = {
+	AA_FS_FILE_STRING("mask", "create read write exec append mmap_exec " \
+				  "link lock"),
+	{ }
+};
+
+static struct aa_fs_entry aa_fs_entry_domain[] = {
+	AA_FS_FILE_BOOLEAN("change_hat",	1),
+	AA_FS_FILE_BOOLEAN("change_hatv",	1),
+	AA_FS_FILE_BOOLEAN("change_onexec",	1),
+	AA_FS_FILE_BOOLEAN("change_profile",	1),
+	{ }
+};
+
+static struct aa_fs_entry aa_fs_entry_features[] = {
+	AA_FS_DIR("domain",			aa_fs_entry_domain),
+	AA_FS_DIR("file",			aa_fs_entry_file),
+	AA_FS_FILE_U64("capability",		VFS_CAP_FLAGS_MASK),
+	AA_FS_DIR("rlimit",			aa_fs_entry_rlimit),
+	{ }
+};
+
+static struct aa_fs_entry aa_fs_entry_apparmor[] = {
+	AA_FS_FILE_FOPS(".load", 0640, &aa_fs_profile_load),
+	AA_FS_FILE_FOPS(".replace", 0640, &aa_fs_profile_replace),
+	AA_FS_FILE_FOPS(".remove", 0640, &aa_fs_profile_remove),
+	AA_FS_DIR("features", aa_fs_entry_features),
+	{ }
+};
+
+static struct aa_fs_entry aa_fs_entry =
+	AA_FS_DIR("apparmor", aa_fs_entry_apparmor);
+
+/**
+ * aafs_create_file - create a file entry in the apparmor securityfs
+ * @fs_file: aa_fs_entry to build an entry for (NOT NULL)
+ * @parent: the parent dentry in the securityfs
+ *
+ * Use aafs_remove_file to remove entries created with this fn.
+ */
+static int __init aafs_create_file(struct aa_fs_entry *fs_file,
+				   struct dentry *parent)
+{
+	int error = 0;
+
+	fs_file->dentry = securityfs_create_file(fs_file->name,
+						 S_IFREG | fs_file->mode,
+						 parent, fs_file,
+						 fs_file->file_ops);
+	if (IS_ERR(fs_file->dentry)) {
+		error = PTR_ERR(fs_file->dentry);
+		fs_file->dentry = NULL;
+	}
+	return error;
+}
+
+/**
+ * aafs_create_dir - recursively create a directory entry in the securityfs
+ * @fs_dir: aa_fs_entry (and all child entries) to build (NOT NULL)
+ * @parent: the parent dentry in the securityfs
+ *
+ * Use aafs_remove_dir to remove entries created with this fn.
+ */
+static int __init aafs_create_dir(struct aa_fs_entry *fs_dir,
+				  struct dentry *parent)
+{
+	int error;
+	struct aa_fs_entry *fs_file;
+
+	fs_dir->dentry = securityfs_create_dir(fs_dir->name, parent);
+	if (IS_ERR(fs_dir->dentry)) {
+		error = PTR_ERR(fs_dir->dentry);
+		fs_dir->dentry = NULL;
+		goto failed;
+	}
+
+	for (fs_file = fs_dir->v.files; fs_file->name; ++fs_file) {
+		if (fs_file->v_type == AA_FS_TYPE_DIR)
+			error = aafs_create_dir(fs_file, fs_dir->dentry);
+		else
+			error = aafs_create_file(fs_file, fs_dir->dentry);
+		if (error)
+			goto failed;
+	}
+
+	return 0;
+
+failed:
+	return error;
+}
+
+/**
+ * aafs_remove_file - drop a single file entry in the apparmor securityfs
+ * @fs_file: aa_fs_entry to detach from the securityfs (NOT NULL)
+ */
+static void __init aafs_remove_file(struct aa_fs_entry *fs_file)
+{
+	if (!fs_file->dentry)
+		return;
+
+	securityfs_remove(fs_file->dentry);
+	fs_file->dentry = NULL;
+}
+
+/**
+ * aafs_remove_dir - recursively drop a directory entry from the securityfs
+ * @fs_dir: aa_fs_entry (and all child entries) to detach (NOT NULL)
+ */
+static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir)
+{
+	struct aa_fs_entry *fs_file;
+
+	for (fs_file = fs_dir->v.files; fs_file->name; ++fs_file) {
+		if (fs_file->v_type == AA_FS_TYPE_DIR)
+			aafs_remove_dir(fs_file);
+		else
+			aafs_remove_file(fs_file);
+	}
+
+	aafs_remove_file(fs_dir);
+}
+
+/**
+ * aa_destroy_aafs - cleanup and free aafs
+ *
+ * releases dentries allocated by aa_create_aafs
+ */
+void __init aa_destroy_aafs(void)
+{
+	aafs_remove_dir(&aa_fs_entry);
+}
+
+/**
+ * aa_create_aafs - create the apparmor security filesystem
+ *
+ * dentries created here are released by aa_destroy_aafs
+ *
+ * Returns: error on failure
+ */
+static int __init aa_create_aafs(void)
+{
+	int error;
+
+	if (!apparmor_initialized)
+		return 0;
+
+	if (aa_fs_entry.dentry) {
+		AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
+		return -EEXIST;
+	}
+
+	/* Populate fs tree. */
+	error = aafs_create_dir(&aa_fs_entry, NULL);
+	if (error)
+		goto error;
+
+	/* TODO: add support for apparmorfs_null and apparmorfs_mnt */
+
+	/* Report that AppArmor fs is enabled */
+	aa_info_message("AppArmor Filesystem Enabled");
+	return 0;
+
+error:
+	aa_destroy_aafs();
+	AA_ERROR("Error creating AppArmor securityfs\n");
+	return error;
+}
+
+fs_initcall(aa_create_aafs);