[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/security/smack/smackfs.c b/ap/os/linux/linux-3.4.x/security/smack/smackfs.c
new file mode 100644
index 0000000..038811c
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/security/smack/smackfs.c
@@ -0,0 +1,1620 @@
+/*
+ * 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 <linux/slab.h>
+#include <net/net_namespace.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_NETLBLADDR = 8, /* single label hosts */
+ SMK_ONLYCAP = 9, /* the only "capable" label */
+ SMK_LOGGING = 10, /* logging */
+ SMK_LOAD_SELF = 11, /* task specific rules */
+ SMK_ACCESSES = 12, /* access policy */
+};
+
+/*
+ * List locks
+ */
+static DEFINE_MUTEX(smack_list_lock);
+static DEFINE_MUTEX(smack_cipso_lock);
+static DEFINE_MUTEX(smack_ambient_lock);
+static DEFINE_MUTEX(smk_netlbladdr_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 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;
+
+/*
+ * Unless a process is running with this label even
+ * having CAP_MAC_OVERRIDE isn't enough to grant
+ * privilege to violate MAC policy. If no label is
+ * designated (the NULL case) capabilities apply to
+ * everyone. It is expected that the hat (^) label
+ * will be used if any label is used.
+ */
+char *smack_onlycap;
+
+/*
+ * Certain IP addresses may be designated as single label hosts.
+ * Packets are sent there unlabeled, but only from tasks that
+ * can write to the specified label.
+ */
+
+LIST_HEAD(smk_netlbladdr_list);
+
+/*
+ * Rule lists are maintained for each label.
+ * This master list is just for reading /smack/load.
+ */
+struct smack_master_list {
+ struct list_head list;
+ struct smack_rule *smk_rule;
+};
+
+LIST_HEAD(smack_rule_list);
+
+static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
+
+const char *smack_cipso_option = SMACK_CIPSO_OPTION;
+
+/*
+ * Values for parsing cipso rules
+ * SMK_DIGITLEN: Length of a digit field in a rule.
+ * SMK_CIPSOMIN: Minimum possible cipso rule length.
+ * SMK_CIPSOMAX: Maximum possible cipso rule length.
+ */
+#define SMK_DIGITLEN 4
+#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
+#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
+
+/*
+ * Values for parsing MAC rules
+ * SMK_ACCESS: Maximum possible combination of access permissions
+ * SMK_ACCESSLEN: Maximum length for a rule access field
+ * SMK_LOADLEN: Smack rule length
+ */
+#define SMK_OACCESS "rwxa"
+#define SMK_ACCESS "rwxat"
+#define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
+#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
+#define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
+#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
+
+/**
+ * smk_netlabel_audit_set - fill a netlbl_audit struct
+ * @nap: structure to fill
+ */
+static void smk_netlabel_audit_set(struct netlbl_audit *nap)
+{
+ nap->loginuid = audit_get_loginuid(current);
+ nap->sessionid = audit_get_sessionid(current);
+ nap->secid = smack_to_secid(smk_of_current());
+}
+
+/*
+ * Values for parsing single label host rules
+ * "1.2.3.4 X"
+ * "192.168.138.129/32 abcdefghijklmnopqrstuvw"
+ */
+#define SMK_NETLBLADDRMIN 9
+#define SMK_NETLBLADDRMAX 42
+
+/**
+ * smk_set_access - add a rule to the rule list
+ * @srp: the new rule to add
+ * @rule_list: the list of rules
+ * @rule_lock: the rule list lock
+ *
+ * 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.
+ *
+ * Returns 1 if a rule was found to exist already, 0 if it is new
+ * Returns 0 if nothing goes wrong or -ENOMEM if it fails
+ * during the allocation of the new pair to add.
+ */
+static int smk_set_access(struct smack_rule *srp, struct list_head *rule_list,
+ struct mutex *rule_lock)
+{
+ struct smack_rule *sp;
+ int found = 0;
+
+ mutex_lock(rule_lock);
+
+ /*
+ * Because the object label is less likely to match
+ * than the subject label check it first
+ */
+ list_for_each_entry_rcu(sp, rule_list, list) {
+ if (sp->smk_object == srp->smk_object &&
+ sp->smk_subject == srp->smk_subject) {
+ found = 1;
+ sp->smk_access = srp->smk_access;
+ break;
+ }
+ }
+ if (found == 0)
+ list_add_rcu(&srp->list, rule_list);
+
+ mutex_unlock(rule_lock);
+
+ return found;
+}
+
+/**
+ * smk_parse_rule - parse Smack rule from load string
+ * @data: string to be parsed whose size is SMK_LOADLEN
+ * @rule: Smack rule
+ * @import: if non-zero, import labels
+ */
+static int smk_parse_rule(const char *data, struct smack_rule *rule, int import)
+{
+ char smack[SMK_LABELLEN];
+ struct smack_known *skp;
+
+ if (import) {
+ rule->smk_subject = smk_import(data, 0);
+ if (rule->smk_subject == NULL)
+ return -1;
+
+ rule->smk_object = smk_import(data + SMK_LABELLEN, 0);
+ if (rule->smk_object == NULL)
+ return -1;
+ } else {
+ smk_parse_smack(data, 0, smack);
+ skp = smk_find_entry(smack);
+ if (skp == NULL)
+ return -1;
+ rule->smk_subject = skp->smk_known;
+
+ smk_parse_smack(data + SMK_LABELLEN, 0, smack);
+ skp = smk_find_entry(smack);
+ if (skp == NULL)
+ return -1;
+ rule->smk_object = skp->smk_known;
+ }
+
+ rule->smk_access = 0;
+
+ switch (data[SMK_LABELLEN + SMK_LABELLEN]) {
+ case '-':
+ break;
+ case 'r':
+ case 'R':
+ rule->smk_access |= MAY_READ;
+ break;
+ default:
+ return -1;
+ }
+
+ switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) {
+ case '-':
+ break;
+ case 'w':
+ case 'W':
+ rule->smk_access |= MAY_WRITE;
+ break;
+ default:
+ return -1;
+ }
+
+ switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) {
+ case '-':
+ break;
+ case 'x':
+ case 'X':
+ rule->smk_access |= MAY_EXEC;
+ break;
+ default:
+ return -1;
+ }
+
+ switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) {
+ case '-':
+ break;
+ case 'a':
+ case 'A':
+ rule->smk_access |= MAY_APPEND;
+ break;
+ default:
+ return -1;
+ }
+
+ switch (data[SMK_LABELLEN + SMK_LABELLEN + 4]) {
+ case '-':
+ break;
+ case 't':
+ case 'T':
+ rule->smk_access |= MAY_TRANSMUTE;
+ break;
+ default:
+ return -1;
+ }
+
+ return 0;
+}
+
+/**
+ * smk_write_load_list - write() for any /smack/load
+ * @file: file pointer, not actually used
+ * @buf: where to get the data from
+ * @count: bytes sent
+ * @ppos: where to start - must be 0
+ * @rule_list: the list of rules to write to
+ * @rule_lock: lock for the rule list
+ *
+ * Get one smack access rule from above.
+ * The format is exactly:
+ * char subject[SMK_LABELLEN]
+ * char object[SMK_LABELLEN]
+ * char access[SMK_ACCESSLEN]
+ *
+ * writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes.
+ */
+static ssize_t smk_write_load_list(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos,
+ struct list_head *rule_list,
+ struct mutex *rule_lock)
+{
+ struct smack_master_list *smlp;
+ struct smack_known *skp;
+ struct smack_rule *rule;
+ char *data;
+ int rc = -EINVAL;
+ int load = 0;
+
+ /*
+ * No partial writes.
+ * Enough data must be present.
+ */
+ if (*ppos != 0)
+ return -EINVAL;
+ /*
+ * Minor hack for backward compatibility
+ */
+ if (count < (SMK_OLOADLEN) || count > SMK_LOADLEN)
+ return -EINVAL;
+
+ data = kzalloc(SMK_LOADLEN, GFP_KERNEL);
+ if (data == NULL)
+ return -ENOMEM;
+
+ if (copy_from_user(data, buf, count) != 0) {
+ rc = -EFAULT;
+ goto out;
+ }
+
+ /*
+ * More on the minor hack for backward compatibility
+ */
+ if (count == (SMK_OLOADLEN))
+ data[SMK_OLOADLEN] = '-';
+
+ rule = kzalloc(sizeof(*rule), GFP_KERNEL);
+ if (rule == NULL) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ if (smk_parse_rule(data, rule, 1))
+ goto out_free_rule;
+
+ if (rule_list == NULL) {
+ load = 1;
+ skp = smk_find_entry(rule->smk_subject);
+ rule_list = &skp->smk_rules;
+ rule_lock = &skp->smk_rules_lock;
+ }
+
+ rc = count;
+ /*
+ * If this is "load" as opposed to "load-self" and a new rule
+ * it needs to get added for reporting.
+ * smk_set_access returns true if there was already a rule
+ * for the subject/object pair, and false if it was new.
+ */
+ if (load && !smk_set_access(rule, rule_list, rule_lock)) {
+ smlp = kzalloc(sizeof(*smlp), GFP_KERNEL);
+ if (smlp != NULL) {
+ smlp->smk_rule = rule;
+ list_add_rcu(&smlp->list, &smack_rule_list);
+ } else
+ rc = -ENOMEM;
+ goto out;
+ }
+
+out_free_rule:
+ kfree(rule);
+out:
+ kfree(data);
+ return rc;
+}
+
+/*
+ * Core logic for smackfs seq list operations.
+ */
+
+static void *smk_seq_start(struct seq_file *s, loff_t *pos,
+ struct list_head *head)
+{
+ struct list_head *list;
+
+ /*
+ * This is 0 the first time through.
+ */
+ if (s->index == 0)
+ s->private = head;
+
+ if (s->private == NULL)
+ return NULL;
+
+ list = s->private;
+ if (list_empty(list))
+ return NULL;
+
+ if (s->index == 0)
+ return list->next;
+ return list;
+}
+
+static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
+ struct list_head *head)
+{
+ struct list_head *list = v;
+
+ if (list_is_last(list, head)) {
+ s->private = NULL;
+ return NULL;
+ }
+ s->private = list->next;
+ return list->next;
+}
+
+static void smk_seq_stop(struct seq_file *s, void *v)
+{
+ /* No-op */
+}
+
+/*
+ * Seq_file read operations for /smack/load
+ */
+
+static void *load_seq_start(struct seq_file *s, loff_t *pos)
+{
+ return smk_seq_start(s, pos, &smack_rule_list);
+}
+
+static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ return smk_seq_next(s, v, pos, &smack_rule_list);
+}
+
+static int load_seq_show(struct seq_file *s, void *v)
+{
+ struct list_head *list = v;
+ struct smack_master_list *smlp =
+ list_entry(list, struct smack_master_list, list);
+ struct smack_rule *srp = smlp->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 & MAY_TRANSMUTE)
+ seq_putc(s, 't');
+ if (srp->smk_access == 0)
+ seq_putc(s, '-');
+
+ seq_putc(s, '\n');
+
+ return 0;
+}
+
+static const struct seq_operations load_seq_ops = {
+ .start = load_seq_start,
+ .next = load_seq_next,
+ .show = load_seq_show,
+ .stop = smk_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)
+{
+ return seq_open(file, &load_seq_ops);
+}
+
+/**
+ * smk_write_load - write() for /smack/load
+ * @file: file pointer, not actually used
+ * @buf: where to get the data from
+ * @count: bytes sent
+ * @ppos: where to start - must be 0
+ *
+ */
+static ssize_t smk_write_load(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+
+ /*
+ * Must have privilege.
+ * No partial writes.
+ * Enough data must be present.
+ */
+ if (!capable(CAP_MAC_ADMIN))
+ return -EPERM;
+
+ return smk_write_load_list(file, buf, count, ppos, NULL, NULL);
+}
+
+static const struct file_operations smk_load_ops = {
+ .open = smk_open_load,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .write = smk_write_load,
+ .release = seq_release,
+};
+
+/**
+ * smk_cipso_doi - initialize the CIPSO domain
+ */
+static void smk_cipso_doi(void)
+{
+ int rc;
+ struct cipso_v4_doi *doip;
+ struct netlbl_audit nai;
+
+ smk_netlabel_audit_set(&nai);
+
+ rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
+ 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(doip, &nai);
+ if (rc != 0) {
+ printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
+ __func__, __LINE__, rc);
+ kfree(doip);
+ return;
+ }
+ rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
+ if (rc != 0) {
+ printk(KERN_WARNING "%s:%d map add rc = %d\n",
+ __func__, __LINE__, rc);
+ kfree(doip);
+ return;
+ }
+}
+
+/**
+ * smk_unlbl_ambient - initialize the unlabeled domain
+ * @oldambient: previous domain string
+ */
+static void smk_unlbl_ambient(char *oldambient)
+{
+ int rc;
+ struct netlbl_audit nai;
+
+ smk_netlabel_audit_set(&nai);
+
+ if (oldambient != NULL) {
+ rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
+ if (rc != 0)
+ printk(KERN_WARNING "%s:%d remove rc = %d\n",
+ __func__, __LINE__, rc);
+ }
+
+ rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET,
+ NULL, NULL, &nai);
+ 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)
+{
+ return smk_seq_start(s, pos, &smack_known_list);
+}
+
+static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ return smk_seq_next(s, v, pos, &smack_known_list);
+}
+
+/*
+ * Print cipso labels in format:
+ * label level[/cat[,cat]]
+ */
+static int cipso_seq_show(struct seq_file *s, void *v)
+{
+ struct list_head *list = v;
+ struct smack_known *skp =
+ list_entry(list, struct smack_known, list);
+ 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 const struct seq_operations cipso_seq_ops = {
+ .start = cipso_seq_start,
+ .next = cipso_seq_next,
+ .show = cipso_seq_show,
+ .stop = smk_seq_stop,
+};
+
+/**
+ * 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
+ * @file: 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 || count > SMK_CIPSOMAX)
+ 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;
+ }
+
+ /* labels cannot begin with a '-' */
+ if (data[0] == '-') {
+ rc = -EINVAL;
+ 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,
+};
+
+/*
+ * Seq_file read operations for /smack/netlabel
+ */
+
+static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos)
+{
+ return smk_seq_start(s, pos, &smk_netlbladdr_list);
+}
+
+static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ return smk_seq_next(s, v, pos, &smk_netlbladdr_list);
+}
+#define BEBITS (sizeof(__be32) * 8)
+
+/*
+ * Print host/label pairs
+ */
+static int netlbladdr_seq_show(struct seq_file *s, void *v)
+{
+ struct list_head *list = v;
+ struct smk_netlbladdr *skp =
+ list_entry(list, struct smk_netlbladdr, list);
+ unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr;
+ int maskn;
+ u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr);
+
+ for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++);
+
+ seq_printf(s, "%u.%u.%u.%u/%d %s\n",
+ hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label);
+
+ return 0;
+}
+
+static const struct seq_operations netlbladdr_seq_ops = {
+ .start = netlbladdr_seq_start,
+ .next = netlbladdr_seq_next,
+ .show = netlbladdr_seq_show,
+ .stop = smk_seq_stop,
+};
+
+/**
+ * smk_open_netlbladdr - open() for /smack/netlabel
+ * @inode: inode structure representing file
+ * @file: "netlabel" file pointer
+ *
+ * Connect our netlbladdr_seq_* operations with /smack/netlabel
+ * file_operations
+ */
+static int smk_open_netlbladdr(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &netlbladdr_seq_ops);
+}
+
+/**
+ * smk_netlbladdr_insert
+ * @new : netlabel to insert
+ *
+ * This helper insert netlabel in the smack_netlbladdrs list
+ * sorted by netmask length (longest to smallest)
+ * locked by &smk_netlbladdr_lock in smk_write_netlbladdr
+ *
+ */
+static void smk_netlbladdr_insert(struct smk_netlbladdr *new)
+{
+ struct smk_netlbladdr *m, *m_next;
+
+ if (list_empty(&smk_netlbladdr_list)) {
+ list_add_rcu(&new->list, &smk_netlbladdr_list);
+ return;
+ }
+
+ m = list_entry_rcu(smk_netlbladdr_list.next,
+ struct smk_netlbladdr, list);
+
+ /* the comparison '>' is a bit hacky, but works */
+ if (new->smk_mask.s_addr > m->smk_mask.s_addr) {
+ list_add_rcu(&new->list, &smk_netlbladdr_list);
+ return;
+ }
+
+ list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) {
+ if (list_is_last(&m->list, &smk_netlbladdr_list)) {
+ list_add_rcu(&new->list, &m->list);
+ return;
+ }
+ m_next = list_entry_rcu(m->list.next,
+ struct smk_netlbladdr, list);
+ if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) {
+ list_add_rcu(&new->list, &m->list);
+ return;
+ }
+ }
+}
+
+
+/**
+ * smk_write_netlbladdr - write() for /smack/netlabel
+ * @file: file pointer, not actually used
+ * @buf: where to get the data from
+ * @count: bytes sent
+ * @ppos: where to start
+ *
+ * Accepts only one netlbladdr per write call.
+ * Returns number of bytes written or error code, as appropriate
+ */
+static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct smk_netlbladdr *skp;
+ struct sockaddr_in newname;
+ char smack[SMK_LABELLEN];
+ char *sp;
+ char data[SMK_NETLBLADDRMAX + 1];
+ char *host = (char *)&newname.sin_addr.s_addr;
+ int rc;
+ struct netlbl_audit audit_info;
+ struct in_addr mask;
+ unsigned int m;
+ int found;
+ u32 mask_bits = (1<<31);
+ __be32 nsa;
+ u32 temp_mask;
+
+ /*
+ * Must have privilege.
+ * No partial writes.
+ * Enough data must be present.
+ * "<addr/mask, as a.b.c.d/e><space><label>"
+ * "<addr, as a.b.c.d><space><label>"
+ */
+ if (!capable(CAP_MAC_ADMIN))
+ return -EPERM;
+ if (*ppos != 0)
+ return -EINVAL;
+ if (count < SMK_NETLBLADDRMIN || count > SMK_NETLBLADDRMAX)
+ return -EINVAL;
+ if (copy_from_user(data, buf, count) != 0)
+ return -EFAULT;
+
+ data[count] = '\0';
+
+ rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s",
+ &host[0], &host[1], &host[2], &host[3], &m, smack);
+ if (rc != 6) {
+ rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
+ &host[0], &host[1], &host[2], &host[3], smack);
+ if (rc != 5)
+ return -EINVAL;
+ m = BEBITS;
+ }
+ if (m > BEBITS)
+ return -EINVAL;
+
+ /* if smack begins with '-', its an option, don't import it */
+ if (smack[0] != '-') {
+ sp = smk_import(smack, 0);
+ if (sp == NULL)
+ return -EINVAL;
+ } else {
+ /* check known options */
+ if (strcmp(smack, smack_cipso_option) == 0)
+ sp = (char *)smack_cipso_option;
+ else
+ return -EINVAL;
+ }
+
+ for (temp_mask = 0; m > 0; m--) {
+ temp_mask |= mask_bits;
+ mask_bits >>= 1;
+ }
+ mask.s_addr = cpu_to_be32(temp_mask);
+
+ newname.sin_addr.s_addr &= mask.s_addr;
+ /*
+ * Only allow one writer at a time. Writes should be
+ * quite rare and small in any case.
+ */
+ mutex_lock(&smk_netlbladdr_lock);
+
+ nsa = newname.sin_addr.s_addr;
+ /* try to find if the prefix is already in the list */
+ found = 0;
+ list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) {
+ if (skp->smk_host.sin_addr.s_addr == nsa &&
+ skp->smk_mask.s_addr == mask.s_addr) {
+ found = 1;
+ break;
+ }
+ }
+ smk_netlabel_audit_set(&audit_info);
+
+ if (found == 0) {
+ skp = kzalloc(sizeof(*skp), GFP_KERNEL);
+ if (skp == NULL)
+ rc = -ENOMEM;
+ else {
+ rc = 0;
+ skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr;
+ skp->smk_mask.s_addr = mask.s_addr;
+ skp->smk_label = sp;
+ smk_netlbladdr_insert(skp);
+ }
+ } else {
+ /* we delete the unlabeled entry, only if the previous label
+ * wasn't the special CIPSO option */
+ if (skp->smk_label != smack_cipso_option)
+ rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
+ &skp->smk_host.sin_addr, &skp->smk_mask,
+ PF_INET, &audit_info);
+ else
+ rc = 0;
+ skp->smk_label = sp;
+ }
+
+ /*
+ * Now tell netlabel about the single label nature of
+ * this host so that incoming packets get labeled.
+ * but only if we didn't get the special CIPSO option
+ */
+ if (rc == 0 && sp != smack_cipso_option)
+ rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
+ &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET,
+ smack_to_secid(skp->smk_label), &audit_info);
+
+ if (rc == 0)
+ rc = count;
+
+ mutex_unlock(&smk_netlbladdr_lock);
+
+ return rc;
+}
+
+static const struct file_operations smk_netlbladdr_ops = {
+ .open = smk_open_netlbladdr,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .write = smk_write_netlbladdr,
+ .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
+ * @file: 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,
+ .llseek = default_llseek,
+};
+
+/**
+ * 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
+ * @file: 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,
+ .llseek = default_llseek,
+};
+
+/**
+ * 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
+ * @file: 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,
+ .llseek = default_llseek,
+};
+
+/**
+ * smk_read_onlycap - read() for /smack/onlycap
+ * @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_onlycap(struct file *filp, char __user *buf,
+ size_t cn, loff_t *ppos)
+{
+ char *smack = "";
+ ssize_t rc = -EINVAL;
+ int asize;
+
+ if (*ppos != 0)
+ return 0;
+
+ if (smack_onlycap != NULL)
+ smack = smack_onlycap;
+
+ asize = strlen(smack) + 1;
+
+ if (cn >= asize)
+ rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
+
+ return rc;
+}
+
+/**
+ * smk_write_onlycap - write() for /smack/onlycap
+ * @file: 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_onlycap(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char in[SMK_LABELLEN];
+ char *sp = smk_of_task(current->cred->security);
+
+ if (!capable(CAP_MAC_ADMIN))
+ return -EPERM;
+
+ /*
+ * This can be done using smk_access() but is done
+ * explicitly for clarity. The smk_access() implementation
+ * would use smk_access(smack_onlycap, MAY_WRITE)
+ */
+ if (smack_onlycap != NULL && smack_onlycap != sp)
+ return -EPERM;
+
+ if (count >= SMK_LABELLEN)
+ return -EINVAL;
+
+ if (copy_from_user(in, buf, count) != 0)
+ return -EFAULT;
+
+ /*
+ * Should the null string be passed in unset the onlycap value.
+ * This seems like something to be careful with as usually
+ * smk_import only expects to return NULL for errors. It
+ * is usually the case that a nullstring or "\n" would be
+ * bad to pass to smk_import but in fact this is useful here.
+ */
+ smack_onlycap = smk_import(in, count);
+
+ return count;
+}
+
+static const struct file_operations smk_onlycap_ops = {
+ .read = smk_read_onlycap,
+ .write = smk_write_onlycap,
+ .llseek = default_llseek,
+};
+
+/**
+ * smk_read_logging - read() for /smack/logging
+ * @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_logging(struct file *filp, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char temp[32];
+ ssize_t rc;
+
+ if (*ppos != 0)
+ return 0;
+
+ sprintf(temp, "%d\n", log_policy);
+ rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
+ return rc;
+}
+
+/**
+ * smk_write_logging - write() for /smack/logging
+ * @file: 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_logging(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char temp[32];
+ 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;
+ if (i < 0 || i > 3)
+ return -EINVAL;
+ log_policy = i;
+ return count;
+}
+
+
+
+static const struct file_operations smk_logging_ops = {
+ .read = smk_read_logging,
+ .write = smk_write_logging,
+ .llseek = default_llseek,
+};
+
+/*
+ * Seq_file read operations for /smack/load-self
+ */
+
+static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
+{
+ struct task_smack *tsp = current_security();
+
+ return smk_seq_start(s, pos, &tsp->smk_rules);
+}
+
+static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ struct task_smack *tsp = current_security();
+
+ return smk_seq_next(s, v, pos, &tsp->smk_rules);
+}
+
+static int load_self_seq_show(struct seq_file *s, void *v)
+{
+ struct list_head *list = v;
+ struct smack_rule *srp =
+ list_entry(list, struct smack_rule, list);
+
+ 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 & MAY_TRANSMUTE)
+ seq_putc(s, 't');
+ if (srp->smk_access == 0)
+ seq_putc(s, '-');
+
+ seq_putc(s, '\n');
+
+ return 0;
+}
+
+static const struct seq_operations load_self_seq_ops = {
+ .start = load_self_seq_start,
+ .next = load_self_seq_next,
+ .show = load_self_seq_show,
+ .stop = smk_seq_stop,
+};
+
+
+/**
+ * smk_open_load_self - open() for /smack/load-self
+ * @inode: inode structure representing file
+ * @file: "load" file pointer
+ *
+ * For reading, use load_seq_* seq_file reading operations.
+ */
+static int smk_open_load_self(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &load_self_seq_ops);
+}
+
+/**
+ * smk_write_load_self - write() for /smack/load-self
+ * @file: file pointer, not actually used
+ * @buf: where to get the data from
+ * @count: bytes sent
+ * @ppos: where to start - must be 0
+ *
+ */
+static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct task_smack *tsp = current_security();
+
+ return smk_write_load_list(file, buf, count, ppos, &tsp->smk_rules,
+ &tsp->smk_rules_lock);
+}
+
+static const struct file_operations smk_load_self_ops = {
+ .open = smk_open_load_self,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .write = smk_write_load_self,
+ .release = seq_release,
+};
+
+/**
+ * smk_write_access - handle access check transaction
+ * @file: file pointer
+ * @buf: data from user space
+ * @count: bytes sent
+ * @ppos: where to start - must be 0
+ */
+static ssize_t smk_write_access(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct smack_rule rule;
+ char *data;
+ int res;
+
+ data = simple_transaction_get(file, buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ if (count < SMK_LOADLEN || smk_parse_rule(data, &rule, 0))
+ return -EINVAL;
+
+ res = smk_access(rule.smk_subject, rule.smk_object, rule.smk_access,
+ NULL);
+ data[0] = res == 0 ? '1' : '0';
+ data[1] = '\0';
+
+ simple_transaction_set(file, 2);
+ return SMK_LOADLEN;
+}
+
+static const struct file_operations smk_access_ops = {
+ .write = smk_write_access,
+ .read = simple_transaction_read,
+ .release = simple_transaction_release,
+ .llseek = generic_file_llseek,
+};
+
+/**
+ * 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_NETLBLADDR] = {
+ "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR},
+ [SMK_ONLYCAP] = {
+ "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
+ [SMK_LOGGING] = {
+ "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
+ [SMK_LOAD_SELF] = {
+ "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
+ [SMK_ACCESSES] = {
+ "access", &smk_access_ops, S_IRUGO|S_IWUGO},
+ /* 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_mount - 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
+ *
+ * Just passes everything along.
+ *
+ * Returns what the lower level code does.
+ */
+static struct dentry *smk_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return mount_single(fs_type, flags, data, smk_fill_super);
+}
+
+static struct file_system_type smk_fs_type = {
+ .name = "smackfs",
+ .mount = smk_mount,
+ .kill_sb = kill_litter_super,
+};
+
+static struct vfsmount *smackfs_mount;
+
+/**
+ * init_smk_fs - get the smackfs superblock
+ *
+ * register the smackfs
+ *
+ * Do not register smackfs if Smack wasn't enabled
+ * on boot. We can not put this method normally under the
+ * smack_init() code path since the security subsystem get
+ * initialized before the vfs caches.
+ *
+ * Returns true if we were not chosen on boot or if
+ * we were chosen and filesystem registration succeeded.
+ */
+static int __init init_smk_fs(void)
+{
+ int err;
+
+ if (!security_module_enable(&smack_ops))
+ return 0;
+
+ 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;
+ }
+ }
+
+ smk_cipso_doi();
+ smk_unlbl_ambient(NULL);
+
+ return err;
+}
+
+__initcall(init_smk_fs);