linux_dsm_epyc7002/security/smack/smackfs.c
Casey Schaufler 4bc87e6277 Smack: unlabeled outgoing ambient packets
Smack uses CIPSO labeling, but allows for unlabeled packets by
specifying an "ambient" label that is applied to incoming unlabeled
packets.

Because the other end of the connection may dislike IP options, and ssh
is one know application that behaves thus, it is prudent to respond in
kind.

This patch changes the network labeling behavior such that an outgoing
packet that would be given a CIPSO label that matches the ambient label
is left unlabeled.  An "unlbl" domain is added and the netlabel
defaulting mechanism invoked rather than assuming that everything is
CIPSO.  Locking has been added around changes to the ambient label as
the mechanisms used to do so are more involved.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Acked-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-19 07:51:00 -08:00

1013 lines
22 KiB
C

/*
* Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.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, version 2.
*
* Authors:
* Casey Schaufler <casey@schaufler-ca.com>
* Ahmed S. Darwish <darwish.07@gmail.com>
*
* Special thanks to the authors of selinuxfs.
*
* Karl MacMillan <kmacmillan@tresys.com>
* James Morris <jmorris@redhat.com>
*
*/
#include <linux/kernel.h>
#include <linux/vmalloc.h>
#include <linux/security.h>
#include <linux/mutex.h>
#include <net/netlabel.h>
#include <net/cipso_ipv4.h>
#include <linux/seq_file.h>
#include <linux/ctype.h>
#include <linux/audit.h>
#include "smack.h"
/*
* smackfs pseudo filesystem.
*/
enum smk_inos {
SMK_ROOT_INO = 2,
SMK_LOAD = 3, /* load policy */
SMK_CIPSO = 4, /* load label -> CIPSO mapping */
SMK_DOI = 5, /* CIPSO DOI */
SMK_DIRECT = 6, /* CIPSO level indicating direct label */
SMK_AMBIENT = 7, /* internet ambient label */
SMK_NLTYPE = 8, /* label scheme to use by default */
};
/*
* List locks
*/
static DEFINE_MUTEX(smack_list_lock);
static DEFINE_MUTEX(smack_cipso_lock);
static DEFINE_MUTEX(smack_ambient_lock);
/*
* This is the "ambient" label for network traffic.
* If it isn't somehow marked, use this.
* It can be reset via smackfs/ambient
*/
char *smack_net_ambient = smack_known_floor.smk_known;
/*
* This is the default packet marking scheme for network traffic.
* It can be reset via smackfs/nltype
*/
int smack_net_nltype = NETLBL_NLTYPE_CIPSOV4;
/*
* This is the level in a CIPSO header that indicates a
* smack label is contained directly in the category set.
* It can be reset via smackfs/direct
*/
int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
struct smk_list_entry *smack_list;
#define SEQ_READ_FINISHED 1
/*
* Disable concurrent writing open() operations
*/
static struct semaphore smack_write_sem;
/*
* Values for parsing cipso rules
* SMK_DIGITLEN: Length of a digit field in a rule.
* SMK_CIPSOMEN: Minimum possible cipso rule length.
*/
#define SMK_DIGITLEN 4
#define SMK_CIPSOMIN (SMK_MAXLEN + 2 * SMK_DIGITLEN)
/*
* Seq_file read operations for /smack/load
*/
static void *load_seq_start(struct seq_file *s, loff_t *pos)
{
if (*pos == SEQ_READ_FINISHED)
return NULL;
return smack_list;
}
static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
struct smk_list_entry *skp = ((struct smk_list_entry *) v)->smk_next;
if (skp == NULL)
*pos = SEQ_READ_FINISHED;
return skp;
}
static int load_seq_show(struct seq_file *s, void *v)
{
struct smk_list_entry *slp = (struct smk_list_entry *) v;
struct smack_rule *srp = &slp->smk_rule;
seq_printf(s, "%s %s", (char *)srp->smk_subject,
(char *)srp->smk_object);
seq_putc(s, ' ');
if (srp->smk_access & MAY_READ)
seq_putc(s, 'r');
if (srp->smk_access & MAY_WRITE)
seq_putc(s, 'w');
if (srp->smk_access & MAY_EXEC)
seq_putc(s, 'x');
if (srp->smk_access & MAY_APPEND)
seq_putc(s, 'a');
if (srp->smk_access == 0)
seq_putc(s, '-');
seq_putc(s, '\n');
return 0;
}
static void load_seq_stop(struct seq_file *s, void *v)
{
/* No-op */
}
static struct seq_operations load_seq_ops = {
.start = load_seq_start,
.next = load_seq_next,
.show = load_seq_show,
.stop = load_seq_stop,
};
/**
* smk_open_load - open() for /smack/load
* @inode: inode structure representing file
* @file: "load" file pointer
*
* For reading, use load_seq_* seq_file reading operations.
*/
static int smk_open_load(struct inode *inode, struct file *file)
{
if ((file->f_flags & O_ACCMODE) == O_RDONLY)
return seq_open(file, &load_seq_ops);
if (down_interruptible(&smack_write_sem))
return -ERESTARTSYS;
return 0;
}
/**
* smk_release_load - release() for /smack/load
* @inode: inode structure representing file
* @file: "load" file pointer
*
* For a reading session, use the seq_file release
* implementation.
* Otherwise, we are at the end of a writing session so
* clean everything up.
*/
static int smk_release_load(struct inode *inode, struct file *file)
{
if ((file->f_flags & O_ACCMODE) == O_RDONLY)
return seq_release(inode, file);
up(&smack_write_sem);
return 0;
}
/**
* smk_set_access - add a rule to the rule list
* @srp: the new rule to add
*
* Looks through the current subject/object/access list for
* the subject/object pair and replaces the access that was
* there. If the pair isn't found add it with the specified
* access.
*/
static void smk_set_access(struct smack_rule *srp)
{
struct smk_list_entry *sp;
struct smk_list_entry *newp;
mutex_lock(&smack_list_lock);
for (sp = smack_list; sp != NULL; sp = sp->smk_next)
if (sp->smk_rule.smk_subject == srp->smk_subject &&
sp->smk_rule.smk_object == srp->smk_object) {
sp->smk_rule.smk_access = srp->smk_access;
break;
}
if (sp == NULL) {
newp = kzalloc(sizeof(struct smk_list_entry), GFP_KERNEL);
newp->smk_rule = *srp;
newp->smk_next = smack_list;
smack_list = newp;
}
mutex_unlock(&smack_list_lock);
return;
}
/**
* smk_write_load - write() for /smack/load
* @filp: file pointer, not actually used
* @buf: where to get the data from
* @count: bytes sent
* @ppos: where to start - must be 0
*
* Get one smack access rule from above.
* The format is exactly:
* char subject[SMK_LABELLEN]
* char object[SMK_LABELLEN]
* char access[SMK_ACCESSKINDS]
*
* Anything following is commentary and ignored.
*
* writes must be SMK_LABELLEN+SMK_LABELLEN+4 bytes.
*/
#define MINIMUM_LOAD (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSKINDS)
static ssize_t smk_write_load(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct smack_rule rule;
char *data;
int rc = -EINVAL;
/*
* Must have privilege.
* No partial writes.
* Enough data must be present.
*/
if (!capable(CAP_MAC_ADMIN))
return -EPERM;
if (*ppos != 0)
return -EINVAL;
if (count < MINIMUM_LOAD)
return -EINVAL;
data = kzalloc(count, GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
if (copy_from_user(data, buf, count) != 0) {
rc = -EFAULT;
goto out;
}
rule.smk_subject = smk_import(data, 0);
if (rule.smk_subject == NULL)
goto out;
rule.smk_object = smk_import(data + SMK_LABELLEN, 0);
if (rule.smk_object == NULL)
goto out;
rule.smk_access = 0;
switch (data[SMK_LABELLEN + SMK_LABELLEN]) {
case '-':
break;
case 'r':
case 'R':
rule.smk_access |= MAY_READ;
break;
default:
goto out;
}
switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) {
case '-':
break;
case 'w':
case 'W':
rule.smk_access |= MAY_WRITE;
break;
default:
goto out;
}
switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) {
case '-':
break;
case 'x':
case 'X':
rule.smk_access |= MAY_EXEC;
break;
default:
goto out;
}
switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) {
case '-':
break;
case 'a':
case 'A':
rule.smk_access |= MAY_READ;
break;
default:
goto out;
}
smk_set_access(&rule);
rc = count;
out:
kfree(data);
return rc;
}
static const struct file_operations smk_load_ops = {
.open = smk_open_load,
.read = seq_read,
.llseek = seq_lseek,
.write = smk_write_load,
.release = smk_release_load,
};
/**
* smk_cipso_doi - initialize the CIPSO domain
*/
void smk_cipso_doi(void)
{
int rc;
struct cipso_v4_doi *doip;
struct netlbl_audit audit_info;
audit_info.loginuid = audit_get_loginuid(current);
audit_info.secid = smack_to_secid(current->security);
rc = netlbl_cfg_map_del(NULL, &audit_info);
if (rc != 0)
printk(KERN_WARNING "%s:%d remove rc = %d\n",
__func__, __LINE__, rc);
doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
if (doip == NULL)
panic("smack: Failed to initialize cipso DOI.\n");
doip->map.std = NULL;
doip->doi = smk_cipso_doi_value;
doip->type = CIPSO_V4_MAP_PASS;
doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
doip->tags[rc] = CIPSO_V4_TAG_INVALID;
rc = netlbl_cfg_cipsov4_add_map(doip, NULL, &audit_info);
if (rc != 0)
printk(KERN_WARNING "%s:%d add rc = %d\n",
__func__, __LINE__, rc);
}
/**
* smk_unlbl_ambient - initialize the unlabeled domain
*/
void smk_unlbl_ambient(char *oldambient)
{
int rc;
struct netlbl_audit audit_info;
audit_info.loginuid = audit_get_loginuid(current);
audit_info.secid = smack_to_secid(current->security);
if (oldambient != NULL) {
rc = netlbl_cfg_map_del(oldambient, &audit_info);
if (rc != 0)
printk(KERN_WARNING "%s:%d remove rc = %d\n",
__func__, __LINE__, rc);
}
rc = netlbl_cfg_unlbl_add_map(smack_net_ambient, &audit_info);
if (rc != 0)
printk(KERN_WARNING "%s:%d add rc = %d\n",
__func__, __LINE__, rc);
}
/*
* Seq_file read operations for /smack/cipso
*/
static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
{
if (*pos == SEQ_READ_FINISHED)
return NULL;
return smack_known;
}
static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
struct smack_known *skp = ((struct smack_known *) v)->smk_next;
/*
* Omit labels with no associated cipso value
*/
while (skp != NULL && !skp->smk_cipso)
skp = skp->smk_next;
if (skp == NULL)
*pos = SEQ_READ_FINISHED;
return skp;
}
/*
* Print cipso labels in format:
* label level[/cat[,cat]]
*/
static int cipso_seq_show(struct seq_file *s, void *v)
{
struct smack_known *skp = (struct smack_known *) v;
struct smack_cipso *scp = skp->smk_cipso;
char *cbp;
char sep = '/';
int cat = 1;
int i;
unsigned char m;
if (scp == NULL)
return 0;
seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level);
cbp = scp->smk_catset;
for (i = 0; i < SMK_LABELLEN; i++)
for (m = 0x80; m != 0; m >>= 1) {
if (m & cbp[i]) {
seq_printf(s, "%c%d", sep, cat);
sep = ',';
}
cat++;
}
seq_putc(s, '\n');
return 0;
}
static void cipso_seq_stop(struct seq_file *s, void *v)
{
/* No-op */
}
static struct seq_operations cipso_seq_ops = {
.start = cipso_seq_start,
.stop = cipso_seq_stop,
.next = cipso_seq_next,
.show = cipso_seq_show,
};
/**
* smk_open_cipso - open() for /smack/cipso
* @inode: inode structure representing file
* @file: "cipso" file pointer
*
* Connect our cipso_seq_* operations with /smack/cipso
* file_operations
*/
static int smk_open_cipso(struct inode *inode, struct file *file)
{
return seq_open(file, &cipso_seq_ops);
}
/**
* smk_write_cipso - write() for /smack/cipso
* @filp: file pointer, not actually used
* @buf: where to get the data from
* @count: bytes sent
* @ppos: where to start
*
* Accepts only one cipso rule per write call.
* Returns number of bytes written or error code, as appropriate
*/
static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct smack_known *skp;
struct smack_cipso *scp = NULL;
char mapcatset[SMK_LABELLEN];
int maplevel;
int cat;
int catlen;
ssize_t rc = -EINVAL;
char *data = NULL;
char *rule;
int ret;
int i;
/*
* Must have privilege.
* No partial writes.
* Enough data must be present.
*/
if (!capable(CAP_MAC_ADMIN))
return -EPERM;
if (*ppos != 0)
return -EINVAL;
if (count <= SMK_CIPSOMIN)
return -EINVAL;
data = kzalloc(count + 1, GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
if (copy_from_user(data, buf, count) != 0) {
rc = -EFAULT;
goto unlockedout;
}
data[count] = '\0';
rule = data;
/*
* Only allow one writer at a time. Writes should be
* quite rare and small in any case.
*/
mutex_lock(&smack_cipso_lock);
skp = smk_import_entry(rule, 0);
if (skp == NULL)
goto out;
rule += SMK_LABELLEN;;
ret = sscanf(rule, "%d", &maplevel);
if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
goto out;
rule += SMK_DIGITLEN;
ret = sscanf(rule, "%d", &catlen);
if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
goto out;
if (count <= (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
goto out;
memset(mapcatset, 0, sizeof(mapcatset));
for (i = 0; i < catlen; i++) {
rule += SMK_DIGITLEN;
ret = sscanf(rule, "%d", &cat);
if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL)
goto out;
smack_catset_bit(cat, mapcatset);
}
if (skp->smk_cipso == NULL) {
scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL);
if (scp == NULL) {
rc = -ENOMEM;
goto out;
}
}
spin_lock_bh(&skp->smk_cipsolock);
if (scp == NULL)
scp = skp->smk_cipso;
else
skp->smk_cipso = scp;
scp->smk_level = maplevel;
memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset));
spin_unlock_bh(&skp->smk_cipsolock);
rc = count;
out:
mutex_unlock(&smack_cipso_lock);
unlockedout:
kfree(data);
return rc;
}
static const struct file_operations smk_cipso_ops = {
.open = smk_open_cipso,
.read = seq_read,
.llseek = seq_lseek,
.write = smk_write_cipso,
.release = seq_release,
};
/**
* smk_read_doi - read() for /smack/doi
* @filp: file pointer, not actually used
* @buf: where to put the result
* @count: maximum to send along
* @ppos: where to start
*
* Returns number of bytes read or error code, as appropriate
*/
static ssize_t smk_read_doi(struct file *filp, char __user *buf,
size_t count, loff_t *ppos)
{
char temp[80];
ssize_t rc;
if (*ppos != 0)
return 0;
sprintf(temp, "%d", smk_cipso_doi_value);
rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
return rc;
}
/**
* smk_write_doi - write() for /smack/doi
* @filp: file pointer, not actually used
* @buf: where to get the data from
* @count: bytes sent
* @ppos: where to start
*
* Returns number of bytes written or error code, as appropriate
*/
static ssize_t smk_write_doi(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
char temp[80];
int i;
if (!capable(CAP_MAC_ADMIN))
return -EPERM;
if (count >= sizeof(temp) || count == 0)
return -EINVAL;
if (copy_from_user(temp, buf, count) != 0)
return -EFAULT;
temp[count] = '\0';
if (sscanf(temp, "%d", &i) != 1)
return -EINVAL;
smk_cipso_doi_value = i;
smk_cipso_doi();
return count;
}
static const struct file_operations smk_doi_ops = {
.read = smk_read_doi,
.write = smk_write_doi,
};
/**
* smk_read_direct - read() for /smack/direct
* @filp: file pointer, not actually used
* @buf: where to put the result
* @count: maximum to send along
* @ppos: where to start
*
* Returns number of bytes read or error code, as appropriate
*/
static ssize_t smk_read_direct(struct file *filp, char __user *buf,
size_t count, loff_t *ppos)
{
char temp[80];
ssize_t rc;
if (*ppos != 0)
return 0;
sprintf(temp, "%d", smack_cipso_direct);
rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
return rc;
}
/**
* smk_write_direct - write() for /smack/direct
* @filp: file pointer, not actually used
* @buf: where to get the data from
* @count: bytes sent
* @ppos: where to start
*
* Returns number of bytes written or error code, as appropriate
*/
static ssize_t smk_write_direct(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
char temp[80];
int i;
if (!capable(CAP_MAC_ADMIN))
return -EPERM;
if (count >= sizeof(temp) || count == 0)
return -EINVAL;
if (copy_from_user(temp, buf, count) != 0)
return -EFAULT;
temp[count] = '\0';
if (sscanf(temp, "%d", &i) != 1)
return -EINVAL;
smack_cipso_direct = i;
return count;
}
static const struct file_operations smk_direct_ops = {
.read = smk_read_direct,
.write = smk_write_direct,
};
/**
* smk_read_ambient - read() for /smack/ambient
* @filp: file pointer, not actually used
* @buf: where to put the result
* @cn: maximum to send along
* @ppos: where to start
*
* Returns number of bytes read or error code, as appropriate
*/
static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
size_t cn, loff_t *ppos)
{
ssize_t rc;
int asize;
if (*ppos != 0)
return 0;
/*
* Being careful to avoid a problem in the case where
* smack_net_ambient gets changed in midstream.
*/
mutex_lock(&smack_ambient_lock);
asize = strlen(smack_net_ambient) + 1;
if (cn >= asize)
rc = simple_read_from_buffer(buf, cn, ppos,
smack_net_ambient, asize);
else
rc = -EINVAL;
mutex_unlock(&smack_ambient_lock);
return rc;
}
/**
* smk_write_ambient - write() for /smack/ambient
* @filp: file pointer, not actually used
* @buf: where to get the data from
* @count: bytes sent
* @ppos: where to start
*
* Returns number of bytes written or error code, as appropriate
*/
static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
char in[SMK_LABELLEN];
char *oldambient;
char *smack;
if (!capable(CAP_MAC_ADMIN))
return -EPERM;
if (count >= SMK_LABELLEN)
return -EINVAL;
if (copy_from_user(in, buf, count) != 0)
return -EFAULT;
smack = smk_import(in, count);
if (smack == NULL)
return -EINVAL;
mutex_lock(&smack_ambient_lock);
oldambient = smack_net_ambient;
smack_net_ambient = smack;
smk_unlbl_ambient(oldambient);
mutex_unlock(&smack_ambient_lock);
return count;
}
static const struct file_operations smk_ambient_ops = {
.read = smk_read_ambient,
.write = smk_write_ambient,
};
struct option_names {
int o_number;
char *o_name;
char *o_alias;
};
static struct option_names netlbl_choices[] = {
{ NETLBL_NLTYPE_RIPSO,
NETLBL_NLTYPE_RIPSO_NAME, "ripso" },
{ NETLBL_NLTYPE_CIPSOV4,
NETLBL_NLTYPE_CIPSOV4_NAME, "cipsov4" },
{ NETLBL_NLTYPE_CIPSOV4,
NETLBL_NLTYPE_CIPSOV4_NAME, "cipso" },
{ NETLBL_NLTYPE_CIPSOV6,
NETLBL_NLTYPE_CIPSOV6_NAME, "cipsov6" },
{ NETLBL_NLTYPE_UNLABELED,
NETLBL_NLTYPE_UNLABELED_NAME, "unlabeled" },
};
/**
* smk_read_nltype - read() for /smack/nltype
* @filp: file pointer, not actually used
* @buf: where to put the result
* @count: maximum to send along
* @ppos: where to start
*
* Returns number of bytes read or error code, as appropriate
*/
static ssize_t smk_read_nltype(struct file *filp, char __user *buf,
size_t count, loff_t *ppos)
{
char bound[40];
ssize_t rc;
int i;
if (count < SMK_LABELLEN)
return -EINVAL;
if (*ppos != 0)
return 0;
sprintf(bound, "unknown");
for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++)
if (smack_net_nltype == netlbl_choices[i].o_number) {
sprintf(bound, "%s", netlbl_choices[i].o_name);
break;
}
rc = simple_read_from_buffer(buf, count, ppos, bound, strlen(bound));
return rc;
}
/**
* smk_write_nltype - write() for /smack/nltype
* @filp: file pointer, not actually used
* @buf: where to get the data from
* @count: bytes sent
* @ppos: where to start
*
* Returns number of bytes written or error code, as appropriate
*/
static ssize_t smk_write_nltype(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
char bound[40];
char *cp;
int i;
if (!capable(CAP_MAC_ADMIN))
return -EPERM;
if (count >= 40)
return -EINVAL;
if (copy_from_user(bound, buf, count) != 0)
return -EFAULT;
bound[count] = '\0';
cp = strchr(bound, ' ');
if (cp != NULL)
*cp = '\0';
cp = strchr(bound, '\n');
if (cp != NULL)
*cp = '\0';
for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++)
if (strcmp(bound, netlbl_choices[i].o_name) == 0 ||
strcmp(bound, netlbl_choices[i].o_alias) == 0) {
smack_net_nltype = netlbl_choices[i].o_number;
return count;
}
/*
* Not a valid choice.
*/
return -EINVAL;
}
static const struct file_operations smk_nltype_ops = {
.read = smk_read_nltype,
.write = smk_write_nltype,
};
/**
* smk_fill_super - fill the /smackfs superblock
* @sb: the empty superblock
* @data: unused
* @silent: unused
*
* Fill in the well known entries for /smack
*
* Returns 0 on success, an error code on failure
*/
static int smk_fill_super(struct super_block *sb, void *data, int silent)
{
int rc;
struct inode *root_inode;
static struct tree_descr smack_files[] = {
[SMK_LOAD] =
{"load", &smk_load_ops, S_IRUGO|S_IWUSR},
[SMK_CIPSO] =
{"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
[SMK_DOI] =
{"doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
[SMK_DIRECT] =
{"direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
[SMK_AMBIENT] =
{"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
[SMK_NLTYPE] =
{"nltype", &smk_nltype_ops, S_IRUGO|S_IWUSR},
/* last one */ {""}
};
rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
if (rc != 0) {
printk(KERN_ERR "%s failed %d while creating inodes\n",
__func__, rc);
return rc;
}
root_inode = sb->s_root->d_inode;
root_inode->i_security = new_inode_smack(smack_known_floor.smk_known);
return 0;
}
/**
* smk_get_sb - get the smackfs superblock
* @fs_type: passed along without comment
* @flags: passed along without comment
* @dev_name: passed along without comment
* @data: passed along without comment
* @mnt: passed along without comment
*
* Just passes everything along.
*
* Returns what the lower level code does.
*/
static int smk_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data,
struct vfsmount *mnt)
{
return get_sb_single(fs_type, flags, data, smk_fill_super, mnt);
}
static struct file_system_type smk_fs_type = {
.name = "smackfs",
.get_sb = smk_get_sb,
.kill_sb = kill_litter_super,
};
static struct vfsmount *smackfs_mount;
/**
* init_smk_fs - get the smackfs superblock
*
* register the smackfs
*
* Returns 0 unless the registration fails.
*/
static int __init init_smk_fs(void)
{
int err;
err = register_filesystem(&smk_fs_type);
if (!err) {
smackfs_mount = kern_mount(&smk_fs_type);
if (IS_ERR(smackfs_mount)) {
printk(KERN_ERR "smackfs: could not mount!\n");
err = PTR_ERR(smackfs_mount);
smackfs_mount = NULL;
}
}
sema_init(&smack_write_sem, 1);
smk_cipso_doi();
smk_unlbl_ambient(NULL);
return err;
}
__initcall(init_smk_fs);