#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
+#include <linux/mutex.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/security.h>
__setup("checkreqprot=", checkreqprot_setup);
-static DECLARE_MUTEX(sel_sem);
+static DEFINE_MUTEX(sel_mutex);
/* global data for booleans */
static struct dentry *bool_dir = NULL;
ssize_t length;
void *data = NULL;
- down(&sel_sem);
+ mutex_lock(&sel_mutex);
length = task_has_security(current, SECURITY__LOAD_POLICY);
if (length)
else
length = count;
out:
- up(&sel_sem);
+ mutex_unlock(&sel_mutex);
vfree(data);
return length;
}
.write = sel_write_load,
};
-
-static ssize_t sel_write_context(struct file * file, const char __user * buf,
- size_t count, loff_t *ppos)
-
+static ssize_t sel_write_context(struct file * file, char *buf, size_t size)
{
- char *page;
- u32 sid;
+ char *canon;
+ u32 sid, len;
ssize_t length;
length = task_has_security(current, SECURITY__CHECK_CONTEXT);
if (length)
return length;
- if (count >= PAGE_SIZE)
- return -ENOMEM;
- if (*ppos != 0) {
- /* No partial writes. */
- return -EINVAL;
- }
- page = (char*)get_zeroed_page(GFP_KERNEL);
- if (!page)
- return -ENOMEM;
- length = -EFAULT;
- if (copy_from_user(page, buf, count))
- goto out;
+ length = security_context_to_sid(buf, size, &sid);
+ if (length < 0)
+ return length;
- length = security_context_to_sid(page, count, &sid);
+ length = security_sid_to_context(sid, &canon, &len);
if (length < 0)
+ return length;
+
+ if (len > SIMPLE_TRANSACTION_LIMIT) {
+ printk(KERN_ERR "%s: context size (%u) exceeds payload "
+ "max\n", __FUNCTION__, len);
+ length = -ERANGE;
goto out;
+ }
- length = count;
+ memcpy(buf, canon, len);
+ length = len;
out:
- free_page((unsigned long) page);
+ kfree(canon);
return length;
}
-static struct file_operations sel_context_ops = {
- .write = sel_write_context,
-};
-
static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
size_t count, loff_t *ppos)
{
[SEL_RELABEL] = sel_write_relabel,
[SEL_USER] = sel_write_user,
[SEL_MEMBER] = sel_write_member,
+ [SEL_CONTEXT] = sel_write_context,
};
static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
char *data;
ssize_t rv;
- if (ino >= sizeof(write_op)/sizeof(write_op[0]) || !write_op[ino])
+ if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
return -EINVAL;
data = simple_transaction_get(file, buf, size);
{
char *page = NULL;
ssize_t length;
- ssize_t end;
ssize_t ret;
int cur_enforcing;
struct inode *inode;
- down(&sel_sem);
+ mutex_lock(&sel_mutex);
ret = -EFAULT;
length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
bool_pending_values[inode->i_ino - BOOL_INO_OFFSET]);
- if (length < 0) {
- ret = length;
- goto out;
- }
-
- if (*ppos >= length) {
- ret = 0;
- goto out;
- }
- if (count + *ppos > length)
- count = length - *ppos;
- end = count + *ppos;
- if (copy_to_user(buf, (char *) page + *ppos, count)) {
- ret = -EFAULT;
- goto out;
- }
- *ppos = end;
- ret = count;
+ ret = simple_read_from_buffer(buf, count, ppos, page, length);
out:
- up(&sel_sem);
+ mutex_unlock(&sel_mutex);
if (page)
free_page((unsigned long)page);
return ret;
int new_value;
struct inode *inode;
- down(&sel_sem);
+ mutex_lock(&sel_mutex);
length = task_has_security(current, SECURITY__SETBOOL);
if (length)
length = count;
out:
- up(&sel_sem);
+ mutex_unlock(&sel_mutex);
if (page)
free_page((unsigned long) page);
return length;
ssize_t length = -EFAULT;
int new_value;
- down(&sel_sem);
+ mutex_lock(&sel_mutex);
length = task_has_security(current, SECURITY__SETBOOL);
if (length)
length = count;
out:
- up(&sel_sem);
+ mutex_unlock(&sel_mutex);
if (page)
free_page((unsigned long) page);
return length;
spin_lock(&dcache_lock);
node = de->d_subdirs.next;
while (node != &de->d_subdirs) {
- struct dentry *d = list_entry(node, struct dentry, d_child);
+ struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
list_del_init(node);
if (d->d_inode) {
return ret;
err:
kfree(values);
- d_genocide(dir);
+ sel_remove_bools(dir);
ret = -ENOMEM;
goto out;
}
#endif
};
- for (i = 0; i < sizeof (files) / sizeof (files[0]); i++) {
+ for (i = 0; i < ARRAY_SIZE(files); i++) {
struct inode *inode;
struct dentry *dentry;
dentry = d_alloc_name(dir, files[i].name);
if (!dentry) {
ret = -ENOMEM;
- goto err;
+ goto out;
}
inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
if (!inode) {
ret = -ENOMEM;
- goto err;
+ goto out;
}
inode->i_fop = files[i].ops;
d_add(dentry, inode);
}
out:
return ret;
-err:
- d_genocide(dir);
- goto out;
}
-static int sel_make_dir(struct super_block *sb, struct dentry *dentry)
+static int sel_make_dir(struct inode *dir, struct dentry *dentry)
{
int ret = 0;
struct inode *inode;
- inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
+ inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
if (!inode) {
ret = -ENOMEM;
goto out;
}
inode->i_op = &simple_dir_inode_operations;
inode->i_fop = &simple_dir_operations;
+ /* directory inodes start off with i_nlink == 2 (for "." entry) */
+ inode->i_nlink++;
d_add(dentry, inode);
+ /* bump link count on parent directory, too */
+ dir->i_nlink++;
out:
return ret;
}
{
int ret;
struct dentry *dentry;
- struct inode *inode;
+ struct inode *inode, *root_inode;
struct inode_security_struct *isec;
static struct tree_descr selinux_files[] = {
[SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
[SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
- [SEL_CONTEXT] = {"context", &sel_context_ops, S_IRUGO|S_IWUGO},
+ [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
[SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
[SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
[SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
};
ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
if (ret)
- return ret;
+ goto err;
+
+ root_inode = sb->s_root->d_inode;
dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
- if (!dentry)
- return -ENOMEM;
+ if (!dentry) {
+ ret = -ENOMEM;
+ goto err;
+ }
- inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
- if (!inode)
- goto out;
- inode->i_op = &simple_dir_inode_operations;
- inode->i_fop = &simple_dir_operations;
- d_add(dentry, inode);
- bool_dir = dentry;
- ret = sel_make_bools();
+ ret = sel_make_dir(root_inode, dentry);
if (ret)
- goto out;
+ goto err;
+
+ bool_dir = dentry;
dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
- if (!dentry)
- return -ENOMEM;
+ if (!dentry) {
+ ret = -ENOMEM;
+ goto err;
+ }
inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
- if (!inode)
- goto out;
+ if (!inode) {
+ ret = -ENOMEM;
+ goto err;
+ }
isec = (struct inode_security_struct*)inode->i_security;
isec->sid = SECINITSID_DEVNULL;
isec->sclass = SECCLASS_CHR_FILE;
selinux_null = dentry;
dentry = d_alloc_name(sb->s_root, "avc");
- if (!dentry)
- return -ENOMEM;
+ if (!dentry) {
+ ret = -ENOMEM;
+ goto err;
+ }
- ret = sel_make_dir(sb, dentry);
+ ret = sel_make_dir(root_inode, dentry);
if (ret)
- goto out;
+ goto err;
ret = sel_make_avc_files(dentry);
if (ret)
- goto out;
-
- return 0;
+ goto err;
out:
- dput(dentry);
+ return ret;
+err:
printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__);
- return -ENOMEM;
+ goto out;
}
static struct super_block *sel_get_sb(struct file_system_type *fs_type,
git.samba.org / sfrench / cifs-2.6.git / blobdiff