v4.19.13 snapshot.
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
new file mode 100644
index 0000000..f6482e5
--- /dev/null
+++ b/security/smack/smackfs.c
@@ -0,0 +1,3016 @@
+/*
+ * 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/cipso_ipv4.h>
+#include <linux/seq_file.h>
+#include <linux/ctype.h>
+#include <linux/audit.h>
+#include <linux/magic.h>
+#include "smack.h"
+
+#define BEBITS (sizeof(__be32) * 8)
+/*
+ * 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_NET4ADDR = 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 */
+ SMK_MAPPED = 13, /* CIPSO level indicating mapped label */
+ SMK_LOAD2 = 14, /* load policy with long labels */
+ SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */
+ SMK_ACCESS2 = 16, /* make an access check with long labels */
+ SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */
+ SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */
+ SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */
+ SMK_SYSLOG = 20, /* change syslog label) */
+ SMK_PTRACE = 21, /* set ptrace rule */
+#ifdef CONFIG_SECURITY_SMACK_BRINGUP
+ SMK_UNCONFINED = 22, /* define an unconfined label */
+#endif
+#if IS_ENABLED(CONFIG_IPV6)
+ SMK_NET6ADDR = 23, /* single label IPv6 hosts */
+#endif /* CONFIG_IPV6 */
+ SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */
+};
+
+/*
+ * List locks
+ */
+static DEFINE_MUTEX(smack_master_list_lock);
+static DEFINE_MUTEX(smack_cipso_lock);
+static DEFINE_MUTEX(smack_ambient_lock);
+static DEFINE_MUTEX(smk_net4addr_lock);
+#if IS_ENABLED(CONFIG_IPV6)
+static DEFINE_MUTEX(smk_net6addr_lock);
+#endif /* CONFIG_IPV6 */
+
+/*
+ * This is the "ambient" label for network traffic.
+ * If it isn't somehow marked, use this.
+ * It can be reset via smackfs/ambient
+ */
+struct smack_known *smack_net_ambient;
+
+/*
+ * 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;
+
+/*
+ * This is the level in a CIPSO header that indicates a
+ * secid is contained directly in the category set.
+ * It can be reset via smackfs/mapped
+ */
+int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
+
+#ifdef CONFIG_SECURITY_SMACK_BRINGUP
+/*
+ * Allow one label to be unconfined. This is for
+ * debugging and application bring-up purposes only.
+ * It is bad and wrong, but everyone seems to expect
+ * to have it.
+ */
+struct smack_known *smack_unconfined;
+#endif
+
+/*
+ * If this value is set restrict syslog use to the label specified.
+ * It can be reset via smackfs/syslog
+ */
+struct smack_known *smack_syslog_label;
+
+/*
+ * Ptrace current rule
+ * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based)
+ * SMACK_PTRACE_EXACT labels must match, but can be overriden with
+ * CAP_SYS_PTRACE
+ * SMACK_PTRACE_DRACONIAN lables must match, CAP_SYS_PTRACE has no effect
+ */
+int smack_ptrace_rule = SMACK_PTRACE_DEFAULT;
+
+/*
+ * 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_net4addr_list);
+#if IS_ENABLED(CONFIG_IPV6)
+LIST_HEAD(smk_net6addr_list);
+#endif /* CONFIG_IPV6 */
+
+/*
+ * Rule lists are maintained for each label.
+ * This master list is just for reading /smack/load and /smack/load2.
+ */
+struct smack_master_list {
+ struct list_head list;
+ struct smack_rule *smk_rule;
+};
+
+static LIST_HEAD(smack_rule_list);
+
+struct smack_parsed_rule {
+ struct smack_known *smk_subject;
+ struct smack_known *smk_object;
+ int smk_access1;
+ int smk_access2;
+};
+
+static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
+
+/*
+ * 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 "rwxatl"
+#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)
+
+/*
+ * Stricly for CIPSO level manipulation.
+ * Set the category bit number in a smack label sized buffer.
+ */
+static inline void smack_catset_bit(unsigned int cat, char *catsetp)
+{
+ if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
+ return;
+
+ catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
+}
+
+/**
+ * smk_netlabel_audit_set - fill a netlbl_audit struct
+ * @nap: structure to fill
+ */
+static void smk_netlabel_audit_set(struct netlbl_audit *nap)
+{
+ struct smack_known *skp = smk_of_current();
+
+ nap->loginuid = audit_get_loginuid(current);
+ nap->sessionid = audit_get_sessionid(current);
+ nap->secid = skp->smk_secid;
+}
+
+/*
+ * Value for parsing single label host rules
+ * "1.2.3.4 X"
+ */
+#define SMK_NETLBLADDRMIN 9
+
+/**
+ * smk_set_access - add a rule to the rule list or replace an old rule
+ * @srp: the rule to add or replace
+ * @rule_list: the list of rules
+ * @rule_lock: the rule list lock
+ * @global: if non-zero, indicates a global rule
+ *
+ * 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 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_parsed_rule *srp,
+ struct list_head *rule_list,
+ struct mutex *rule_lock, int global)
+{
+ struct smack_rule *sp;
+ struct smack_master_list *smlp;
+ int found = 0;
+ int rc = 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_access1;
+ sp->smk_access &= ~srp->smk_access2;
+ break;
+ }
+ }
+
+ if (found == 0) {
+ sp = kzalloc(sizeof(*sp), GFP_KERNEL);
+ if (sp == NULL) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ sp->smk_subject = srp->smk_subject;
+ sp->smk_object = srp->smk_object;
+ sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
+
+ list_add_rcu(&sp->list, rule_list);
+ /*
+ * If this is a global as opposed to self and a new rule
+ * it needs to get added for reporting.
+ */
+ if (global) {
+ mutex_unlock(rule_lock);
+ smlp = kzalloc(sizeof(*smlp), GFP_KERNEL);
+ if (smlp != NULL) {
+ smlp->smk_rule = sp;
+ mutex_lock(&smack_master_list_lock);
+ list_add_rcu(&smlp->list, &smack_rule_list);
+ mutex_unlock(&smack_master_list_lock);
+ } else
+ rc = -ENOMEM;
+ return rc;
+ }
+ }
+
+out:
+ mutex_unlock(rule_lock);
+ return rc;
+}
+
+/**
+ * smk_perm_from_str - parse smack accesses from a text string
+ * @string: a text string that contains a Smack accesses code
+ *
+ * Returns an integer with respective bits set for specified accesses.
+ */
+static int smk_perm_from_str(const char *string)
+{
+ int perm = 0;
+ const char *cp;
+
+ for (cp = string; ; cp++)
+ switch (*cp) {
+ case '-':
+ break;
+ case 'r':
+ case 'R':
+ perm |= MAY_READ;
+ break;
+ case 'w':
+ case 'W':
+ perm |= MAY_WRITE;
+ break;
+ case 'x':
+ case 'X':
+ perm |= MAY_EXEC;
+ break;
+ case 'a':
+ case 'A':
+ perm |= MAY_APPEND;
+ break;
+ case 't':
+ case 'T':
+ perm |= MAY_TRANSMUTE;
+ break;
+ case 'l':
+ case 'L':
+ perm |= MAY_LOCK;
+ break;
+ case 'b':
+ case 'B':
+ perm |= MAY_BRINGUP;
+ break;
+ default:
+ return perm;
+ }
+}
+
+/**
+ * smk_fill_rule - Fill Smack rule from strings
+ * @subject: subject label string
+ * @object: object label string
+ * @access1: access string
+ * @access2: string with permissions to be removed
+ * @rule: Smack rule
+ * @import: if non-zero, import labels
+ * @len: label length limit
+ *
+ * Returns 0 on success, appropriate error code on failure.
+ */
+static int smk_fill_rule(const char *subject, const char *object,
+ const char *access1, const char *access2,
+ struct smack_parsed_rule *rule, int import,
+ int len)
+{
+ const char *cp;
+ struct smack_known *skp;
+
+ if (import) {
+ rule->smk_subject = smk_import_entry(subject, len);
+ if (IS_ERR(rule->smk_subject))
+ return PTR_ERR(rule->smk_subject);
+
+ rule->smk_object = smk_import_entry(object, len);
+ if (IS_ERR(rule->smk_object))
+ return PTR_ERR(rule->smk_object);
+ } else {
+ cp = smk_parse_smack(subject, len);
+ if (IS_ERR(cp))
+ return PTR_ERR(cp);
+ skp = smk_find_entry(cp);
+ kfree(cp);
+ if (skp == NULL)
+ return -ENOENT;
+ rule->smk_subject = skp;
+
+ cp = smk_parse_smack(object, len);
+ if (IS_ERR(cp))
+ return PTR_ERR(cp);
+ skp = smk_find_entry(cp);
+ kfree(cp);
+ if (skp == NULL)
+ return -ENOENT;
+ rule->smk_object = skp;
+ }
+
+ rule->smk_access1 = smk_perm_from_str(access1);
+ if (access2)
+ rule->smk_access2 = smk_perm_from_str(access2);
+ else
+ rule->smk_access2 = ~rule->smk_access1;
+
+ return 0;
+}
+
+/**
+ * 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
+ *
+ * Returns 0 on success, -1 on errors.
+ */
+static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
+ int import)
+{
+ int rc;
+
+ rc = smk_fill_rule(data, data + SMK_LABELLEN,
+ data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
+ import, SMK_LABELLEN);
+ return rc;
+}
+
+/**
+ * smk_parse_long_rule - parse Smack rule from rule string
+ * @data: string to be parsed, null terminated
+ * @rule: Will be filled with Smack parsed rule
+ * @import: if non-zero, import labels
+ * @tokens: numer of substrings expected in data
+ *
+ * Returns number of processed bytes on success, -ERRNO on failure.
+ */
+static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
+ int import, int tokens)
+{
+ ssize_t cnt = 0;
+ char *tok[4];
+ int rc;
+ int i;
+
+ /*
+ * Parsing the rule in-place, filling all white-spaces with '\0'
+ */
+ for (i = 0; i < tokens; ++i) {
+ while (isspace(data[cnt]))
+ data[cnt++] = '\0';
+
+ if (data[cnt] == '\0')
+ /* Unexpected end of data */
+ return -EINVAL;
+
+ tok[i] = data + cnt;
+
+ while (data[cnt] && !isspace(data[cnt]))
+ ++cnt;
+ }
+ while (isspace(data[cnt]))
+ data[cnt++] = '\0';
+
+ while (i < 4)
+ tok[i++] = NULL;
+
+ rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
+ return rc == 0 ? cnt : rc;
+}
+
+#define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
+#define SMK_LONG_FMT 1 /* Variable long label format */
+#define SMK_CHANGE_FMT 2 /* Rule modification format */
+/**
+ * smk_write_rules_list - write() for any /smack rule file
+ * @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
+ * @format: /smack/load or /smack/load2 or /smack/change-rule format.
+ *
+ * Get one smack access rule from above.
+ * The format for SMK_LONG_FMT is:
+ * "subject<whitespace>object<whitespace>access[<whitespace>...]"
+ * The format for SMK_FIXED24_FMT is exactly:
+ * "subject object rwxat"
+ * The format for SMK_CHANGE_FMT is:
+ * "subject<whitespace>object<whitespace>
+ * acc_enable<whitespace>acc_disable[<whitespace>...]"
+ */
+static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos,
+ struct list_head *rule_list,
+ struct mutex *rule_lock, int format)
+{
+ struct smack_parsed_rule rule;
+ char *data;
+ int rc;
+ int trunc = 0;
+ int tokens;
+ ssize_t cnt = 0;
+
+ /*
+ * No partial writes.
+ * Enough data must be present.
+ */
+ if (*ppos != 0)
+ return -EINVAL;
+
+ if (format == SMK_FIXED24_FMT) {
+ /*
+ * Minor hack for backward compatibility
+ */
+ if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
+ return -EINVAL;
+ } else {
+ if (count >= PAGE_SIZE) {
+ count = PAGE_SIZE - 1;
+ trunc = 1;
+ }
+ }
+
+ data = memdup_user_nul(buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ /*
+ * In case of parsing only part of user buf,
+ * avoid having partial rule at the data buffer
+ */
+ if (trunc) {
+ while (count > 0 && (data[count - 1] != '\n'))
+ --count;
+ if (count == 0) {
+ rc = -EINVAL;
+ goto out;
+ }
+ }
+
+ data[count] = '\0';
+ tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
+ while (cnt < count) {
+ if (format == SMK_FIXED24_FMT) {
+ rc = smk_parse_rule(data, &rule, 1);
+ if (rc < 0)
+ goto out;
+ cnt = count;
+ } else {
+ rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
+ if (rc < 0)
+ goto out;
+ if (rc == 0) {
+ rc = -EINVAL;
+ goto out;
+ }
+ cnt += rc;
+ }
+
+ if (rule_list == NULL)
+ rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
+ &rule.smk_subject->smk_rules_lock, 1);
+ else
+ rc = smk_set_access(&rule, rule_list, rule_lock, 0);
+
+ if (rc)
+ goto out;
+ }
+
+ rc = cnt;
+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;
+ int i = *pos;
+
+ rcu_read_lock();
+ for (list = rcu_dereference(list_next_rcu(head));
+ list != head;
+ list = rcu_dereference(list_next_rcu(list))) {
+ if (i-- == 0)
+ return list;
+ }
+
+ return NULL;
+}
+
+static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
+ struct list_head *head)
+{
+ struct list_head *list = v;
+
+ ++*pos;
+ list = rcu_dereference(list_next_rcu(list));
+
+ return (list == head) ? NULL : list;
+}
+
+static void smk_seq_stop(struct seq_file *s, void *v)
+{
+ rcu_read_unlock();
+}
+
+static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
+{
+ /*
+ * Don't show any rules with label names too long for
+ * interface file (/smack/load or /smack/load2)
+ * because you should expect to be able to write
+ * anything you read back.
+ */
+ if (strlen(srp->smk_subject->smk_known) >= max ||
+ strlen(srp->smk_object->smk_known) >= max)
+ return;
+
+ if (srp->smk_access == 0)
+ return;
+
+ seq_printf(s, "%s %s",
+ srp->smk_subject->smk_known,
+ srp->smk_object->smk_known);
+
+ 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 & MAY_LOCK)
+ seq_putc(s, 'l');
+ if (srp->smk_access & MAY_BRINGUP)
+ seq_putc(s, 'b');
+
+ seq_putc(s, '\n');
+}
+
+/*
+ * Seq_file read operations for /smack/load
+ */
+
+static void *load2_seq_start(struct seq_file *s, loff_t *pos)
+{
+ return smk_seq_start(s, pos, &smack_rule_list);
+}
+
+static void *load2_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_rcu(list, struct smack_master_list, list);
+
+ smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN);
+
+ return 0;
+}
+
+static const struct seq_operations load_seq_ops = {
+ .start = load2_seq_start,
+ .next = load2_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 (!smack_privileged(CAP_MAC_ADMIN))
+ return -EPERM;
+
+ return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
+ SMK_FIXED24_FMT);
+}
+
+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);
+ }
+ if (smack_net_ambient == NULL)
+ smack_net_ambient = &smack_known_floor;
+
+ rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, 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_rcu(list, struct smack_known, list);
+ struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
+ char sep = '/';
+ int i;
+
+ /*
+ * Don't show a label that could not have been set using
+ * /smack/cipso. This is in support of the notion that
+ * anything read from /smack/cipso ought to be writeable
+ * to /smack/cipso.
+ *
+ * /smack/cipso2 should be used instead.
+ */
+ if (strlen(skp->smk_known) >= SMK_LABELLEN)
+ return 0;
+
+ seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
+
+ for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
+ i = netlbl_catmap_walk(cmp, i + 1)) {
+ seq_printf(s, "%c%d", sep, i);
+ sep = ',';
+ }
+
+ 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_set_cipso - do the work for write() for cipso and cipso2
+ * @file: file pointer, not actually used
+ * @buf: where to get the data from
+ * @count: bytes sent
+ * @ppos: where to start
+ * @format: /smack/cipso or /smack/cipso2
+ *
+ * Accepts only one cipso rule per write call.
+ * Returns number of bytes written or error code, as appropriate
+ */
+static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos, int format)
+{
+ struct smack_known *skp;
+ struct netlbl_lsm_secattr ncats;
+ char mapcatset[SMK_CIPSOLEN];
+ int maplevel;
+ unsigned 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 (!smack_privileged(CAP_MAC_ADMIN))
+ return -EPERM;
+ if (*ppos != 0)
+ return -EINVAL;
+ if (format == SMK_FIXED24_FMT &&
+ (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
+ return -EINVAL;
+
+ data = memdup_user_nul(buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ 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 (IS_ERR(skp)) {
+ rc = PTR_ERR(skp);
+ goto out;
+ }
+
+ if (format == SMK_FIXED24_FMT)
+ rule += SMK_LABELLEN;
+ else
+ rule += strlen(skp->smk_known) + 1;
+
+ 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 (format == SMK_FIXED24_FMT &&
+ 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, "%u", &cat);
+ if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
+ goto out;
+
+ smack_catset_bit(cat, mapcatset);
+ }
+
+ rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
+ if (rc >= 0) {
+ netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat);
+ skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
+ skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
+ rc = count;
+ }
+
+out:
+ mutex_unlock(&smack_cipso_lock);
+ kfree(data);
+ return rc;
+}
+
+/**
+ * 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)
+{
+ return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
+}
+
+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/cipso2
+ */
+
+/*
+ * Print cipso labels in format:
+ * label level[/cat[,cat]]
+ */
+static int cipso2_seq_show(struct seq_file *s, void *v)
+{
+ struct list_head *list = v;
+ struct smack_known *skp =
+ list_entry_rcu(list, struct smack_known, list);
+ struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
+ char sep = '/';
+ int i;
+
+ seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
+
+ for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
+ i = netlbl_catmap_walk(cmp, i + 1)) {
+ seq_printf(s, "%c%d", sep, i);
+ sep = ',';
+ }
+
+ seq_putc(s, '\n');
+
+ return 0;
+}
+
+static const struct seq_operations cipso2_seq_ops = {
+ .start = cipso_seq_start,
+ .next = cipso_seq_next,
+ .show = cipso2_seq_show,
+ .stop = smk_seq_stop,
+};
+
+/**
+ * smk_open_cipso2 - open() for /smack/cipso2
+ * @inode: inode structure representing file
+ * @file: "cipso2" file pointer
+ *
+ * Connect our cipso_seq_* operations with /smack/cipso2
+ * file_operations
+ */
+static int smk_open_cipso2(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &cipso2_seq_ops);
+}
+
+/**
+ * smk_write_cipso2 - write() for /smack/cipso2
+ * @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_cipso2(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
+}
+
+static const struct file_operations smk_cipso2_ops = {
+ .open = smk_open_cipso2,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .write = smk_write_cipso2,
+ .release = seq_release,
+};
+
+/*
+ * Seq_file read operations for /smack/netlabel
+ */
+
+static void *net4addr_seq_start(struct seq_file *s, loff_t *pos)
+{
+ return smk_seq_start(s, pos, &smk_net4addr_list);
+}
+
+static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ return smk_seq_next(s, v, pos, &smk_net4addr_list);
+}
+
+/*
+ * Print host/label pairs
+ */
+static int net4addr_seq_show(struct seq_file *s, void *v)
+{
+ struct list_head *list = v;
+ struct smk_net4addr *skp =
+ list_entry_rcu(list, struct smk_net4addr, list);
+ char *kp = SMACK_CIPSO_OPTION;
+
+ if (skp->smk_label != NULL)
+ kp = skp->smk_label->smk_known;
+ seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr,
+ skp->smk_masks, kp);
+
+ return 0;
+}
+
+static const struct seq_operations net4addr_seq_ops = {
+ .start = net4addr_seq_start,
+ .next = net4addr_seq_next,
+ .show = net4addr_seq_show,
+ .stop = smk_seq_stop,
+};
+
+/**
+ * smk_open_net4addr - open() for /smack/netlabel
+ * @inode: inode structure representing file
+ * @file: "netlabel" file pointer
+ *
+ * Connect our net4addr_seq_* operations with /smack/netlabel
+ * file_operations
+ */
+static int smk_open_net4addr(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &net4addr_seq_ops);
+}
+
+/**
+ * smk_net4addr_insert
+ * @new : netlabel to insert
+ *
+ * This helper insert netlabel in the smack_net4addrs list
+ * sorted by netmask length (longest to smallest)
+ * locked by &smk_net4addr_lock in smk_write_net4addr
+ *
+ */
+static void smk_net4addr_insert(struct smk_net4addr *new)
+{
+ struct smk_net4addr *m;
+ struct smk_net4addr *m_next;
+
+ if (list_empty(&smk_net4addr_list)) {
+ list_add_rcu(&new->list, &smk_net4addr_list);
+ return;
+ }
+
+ m = list_entry_rcu(smk_net4addr_list.next,
+ struct smk_net4addr, list);
+
+ /* the comparison '>' is a bit hacky, but works */
+ if (new->smk_masks > m->smk_masks) {
+ list_add_rcu(&new->list, &smk_net4addr_list);
+ return;
+ }
+
+ list_for_each_entry_rcu(m, &smk_net4addr_list, list) {
+ if (list_is_last(&m->list, &smk_net4addr_list)) {
+ list_add_rcu(&new->list, &m->list);
+ return;
+ }
+ m_next = list_entry_rcu(m->list.next,
+ struct smk_net4addr, list);
+ if (new->smk_masks > m_next->smk_masks) {
+ list_add_rcu(&new->list, &m->list);
+ return;
+ }
+ }
+}
+
+
+/**
+ * smk_write_net4addr - 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 net4addr per write call.
+ * Returns number of bytes written or error code, as appropriate
+ */
+static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct smk_net4addr *snp;
+ struct sockaddr_in newname;
+ char *smack;
+ struct smack_known *skp = NULL;
+ char *data;
+ char *host = (char *)&newname.sin_addr.s_addr;
+ int rc;
+ struct netlbl_audit audit_info;
+ struct in_addr mask;
+ unsigned int m;
+ unsigned int masks;
+ 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 (!smack_privileged(CAP_MAC_ADMIN))
+ return -EPERM;
+ if (*ppos != 0)
+ return -EINVAL;
+ if (count < SMK_NETLBLADDRMIN)
+ return -EINVAL;
+
+ data = memdup_user_nul(buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ smack = kzalloc(count + 1, GFP_KERNEL);
+ if (smack == NULL) {
+ rc = -ENOMEM;
+ goto free_data_out;
+ }
+
+ rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
+ &host[0], &host[1], &host[2], &host[3], &masks, smack);
+ if (rc != 6) {
+ rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
+ &host[0], &host[1], &host[2], &host[3], smack);
+ if (rc != 5) {
+ rc = -EINVAL;
+ goto free_out;
+ }
+ m = BEBITS;
+ masks = 32;
+ }
+ if (masks > BEBITS) {
+ rc = -EINVAL;
+ goto free_out;
+ }
+
+ /*
+ * If smack begins with '-', it is an option, don't import it
+ */
+ if (smack[0] != '-') {
+ skp = smk_import_entry(smack, 0);
+ if (IS_ERR(skp)) {
+ rc = PTR_ERR(skp);
+ goto free_out;
+ }
+ } else {
+ /*
+ * Only the -CIPSO option is supported for IPv4
+ */
+ if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) {
+ rc = -EINVAL;
+ goto free_out;
+ }
+ }
+
+ for (m = masks, 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_net4addr_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(snp, &smk_net4addr_list, list) {
+ if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) {
+ found = 1;
+ break;
+ }
+ }
+ smk_netlabel_audit_set(&audit_info);
+
+ if (found == 0) {
+ snp = kzalloc(sizeof(*snp), GFP_KERNEL);
+ if (snp == NULL)
+ rc = -ENOMEM;
+ else {
+ rc = 0;
+ snp->smk_host.s_addr = newname.sin_addr.s_addr;
+ snp->smk_mask.s_addr = mask.s_addr;
+ snp->smk_label = skp;
+ snp->smk_masks = masks;
+ smk_net4addr_insert(snp);
+ }
+ } else {
+ /*
+ * Delete the unlabeled entry, only if the previous label
+ * wasn't the special CIPSO option
+ */
+ if (snp->smk_label != NULL)
+ rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
+ &snp->smk_host, &snp->smk_mask,
+ PF_INET, &audit_info);
+ else
+ rc = 0;
+ snp->smk_label = skp;
+ }
+
+ /*
+ * 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 && skp != NULL)
+ rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
+ &snp->smk_host, &snp->smk_mask, PF_INET,
+ snp->smk_label->smk_secid, &audit_info);
+
+ if (rc == 0)
+ rc = count;
+
+ mutex_unlock(&smk_net4addr_lock);
+
+free_out:
+ kfree(smack);
+free_data_out:
+ kfree(data);
+
+ return rc;
+}
+
+static const struct file_operations smk_net4addr_ops = {
+ .open = smk_open_net4addr,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .write = smk_write_net4addr,
+ .release = seq_release,
+};
+
+#if IS_ENABLED(CONFIG_IPV6)
+/*
+ * Seq_file read operations for /smack/netlabel6
+ */
+
+static void *net6addr_seq_start(struct seq_file *s, loff_t *pos)
+{
+ return smk_seq_start(s, pos, &smk_net6addr_list);
+}
+
+static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ return smk_seq_next(s, v, pos, &smk_net6addr_list);
+}
+
+/*
+ * Print host/label pairs
+ */
+static int net6addr_seq_show(struct seq_file *s, void *v)
+{
+ struct list_head *list = v;
+ struct smk_net6addr *skp =
+ list_entry(list, struct smk_net6addr, list);
+
+ if (skp->smk_label != NULL)
+ seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks,
+ skp->smk_label->smk_known);
+
+ return 0;
+}
+
+static const struct seq_operations net6addr_seq_ops = {
+ .start = net6addr_seq_start,
+ .next = net6addr_seq_next,
+ .show = net6addr_seq_show,
+ .stop = smk_seq_stop,
+};
+
+/**
+ * smk_open_net6addr - open() for /smack/netlabel
+ * @inode: inode structure representing file
+ * @file: "netlabel" file pointer
+ *
+ * Connect our net6addr_seq_* operations with /smack/netlabel
+ * file_operations
+ */
+static int smk_open_net6addr(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &net6addr_seq_ops);
+}
+
+/**
+ * smk_net6addr_insert
+ * @new : entry to insert
+ *
+ * This inserts an entry in the smack_net6addrs list
+ * sorted by netmask length (longest to smallest)
+ * locked by &smk_net6addr_lock in smk_write_net6addr
+ *
+ */
+static void smk_net6addr_insert(struct smk_net6addr *new)
+{
+ struct smk_net6addr *m_next;
+ struct smk_net6addr *m;
+
+ if (list_empty(&smk_net6addr_list)) {
+ list_add_rcu(&new->list, &smk_net6addr_list);
+ return;
+ }
+
+ m = list_entry_rcu(smk_net6addr_list.next,
+ struct smk_net6addr, list);
+
+ if (new->smk_masks > m->smk_masks) {
+ list_add_rcu(&new->list, &smk_net6addr_list);
+ return;
+ }
+
+ list_for_each_entry_rcu(m, &smk_net6addr_list, list) {
+ if (list_is_last(&m->list, &smk_net6addr_list)) {
+ list_add_rcu(&new->list, &m->list);
+ return;
+ }
+ m_next = list_entry_rcu(m->list.next,
+ struct smk_net6addr, list);
+ if (new->smk_masks > m_next->smk_masks) {
+ list_add_rcu(&new->list, &m->list);
+ return;
+ }
+ }
+}
+
+
+/**
+ * smk_write_net6addr - 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 net6addr per write call.
+ * Returns number of bytes written or error code, as appropriate
+ */
+static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct smk_net6addr *snp;
+ struct in6_addr newname;
+ struct in6_addr fullmask;
+ struct smack_known *skp = NULL;
+ char *smack;
+ char *data;
+ int rc = 0;
+ int found = 0;
+ int i;
+ unsigned int scanned[8];
+ unsigned int m;
+ unsigned int mask = 128;
+
+ /*
+ * Must have privilege.
+ * No partial writes.
+ * Enough data must be present.
+ * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>"
+ * "<addr, as a:b:c:d:e:f:g:h><space><label>"
+ */
+ if (!smack_privileged(CAP_MAC_ADMIN))
+ return -EPERM;
+ if (*ppos != 0)
+ return -EINVAL;
+ if (count < SMK_NETLBLADDRMIN)
+ return -EINVAL;
+
+ data = memdup_user_nul(buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ smack = kzalloc(count + 1, GFP_KERNEL);
+ if (smack == NULL) {
+ rc = -ENOMEM;
+ goto free_data_out;
+ }
+
+ i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s",
+ &scanned[0], &scanned[1], &scanned[2], &scanned[3],
+ &scanned[4], &scanned[5], &scanned[6], &scanned[7],
+ &mask, smack);
+ if (i != 10) {
+ i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s",
+ &scanned[0], &scanned[1], &scanned[2],
+ &scanned[3], &scanned[4], &scanned[5],
+ &scanned[6], &scanned[7], smack);
+ if (i != 9) {
+ rc = -EINVAL;
+ goto free_out;
+ }
+ }
+ if (mask > 128) {
+ rc = -EINVAL;
+ goto free_out;
+ }
+ for (i = 0; i < 8; i++) {
+ if (scanned[i] > 0xffff) {
+ rc = -EINVAL;
+ goto free_out;
+ }
+ newname.s6_addr16[i] = htons(scanned[i]);
+ }
+
+ /*
+ * If smack begins with '-', it is an option, don't import it
+ */
+ if (smack[0] != '-') {
+ skp = smk_import_entry(smack, 0);
+ if (IS_ERR(skp)) {
+ rc = PTR_ERR(skp);
+ goto free_out;
+ }
+ } else {
+ /*
+ * Only -DELETE is supported for IPv6
+ */
+ if (strcmp(smack, SMACK_DELETE_OPTION) != 0) {
+ rc = -EINVAL;
+ goto free_out;
+ }
+ }
+
+ for (i = 0, m = mask; i < 8; i++) {
+ if (m >= 16) {
+ fullmask.s6_addr16[i] = 0xffff;
+ m -= 16;
+ } else if (m > 0) {
+ fullmask.s6_addr16[i] = (1 << m) - 1;
+ m = 0;
+ } else
+ fullmask.s6_addr16[i] = 0;
+ newname.s6_addr16[i] &= fullmask.s6_addr16[i];
+ }
+
+ /*
+ * Only allow one writer at a time. Writes should be
+ * quite rare and small in any case.
+ */
+ mutex_lock(&smk_net6addr_lock);
+ /*
+ * Try to find the prefix in the list
+ */
+ list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
+ if (mask != snp->smk_masks)
+ continue;
+ for (found = 1, i = 0; i < 8; i++) {
+ if (newname.s6_addr16[i] !=
+ snp->smk_host.s6_addr16[i]) {
+ found = 0;
+ break;
+ }
+ }
+ if (found == 1)
+ break;
+ }
+ if (found == 0) {
+ snp = kzalloc(sizeof(*snp), GFP_KERNEL);
+ if (snp == NULL)
+ rc = -ENOMEM;
+ else {
+ snp->smk_host = newname;
+ snp->smk_mask = fullmask;
+ snp->smk_masks = mask;
+ snp->smk_label = skp;
+ smk_net6addr_insert(snp);
+ }
+ } else {
+ snp->smk_label = skp;
+ }
+
+ if (rc == 0)
+ rc = count;
+
+ mutex_unlock(&smk_net6addr_lock);
+
+free_out:
+ kfree(smack);
+free_data_out:
+ kfree(data);
+
+ return rc;
+}
+
+static const struct file_operations smk_net6addr_ops = {
+ .open = smk_open_net6addr,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .write = smk_write_net6addr,
+ .release = seq_release,
+};
+#endif /* CONFIG_IPV6 */
+
+/**
+ * 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 (!smack_privileged(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)
+{
+ struct smack_known *skp;
+ char temp[80];
+ int i;
+
+ if (!smack_privileged(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;
+
+ /*
+ * Don't do anything if the value hasn't actually changed.
+ * If it is changing reset the level on entries that were
+ * set up to be direct when they were created.
+ */
+ if (smack_cipso_direct != i) {
+ mutex_lock(&smack_known_lock);
+ list_for_each_entry_rcu(skp, &smack_known_list, list)
+ if (skp->smk_netlabel.attr.mls.lvl ==
+ smack_cipso_direct)
+ skp->smk_netlabel.attr.mls.lvl = i;
+ smack_cipso_direct = i;
+ mutex_unlock(&smack_known_lock);
+ }
+
+ return count;
+}
+
+static const struct file_operations smk_direct_ops = {
+ .read = smk_read_direct,
+ .write = smk_write_direct,
+ .llseek = default_llseek,
+};
+
+/**
+ * smk_read_mapped - read() for /smack/mapped
+ * @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_mapped(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_mapped);
+ rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
+
+ return rc;
+}
+
+/**
+ * smk_write_mapped - write() for /smack/mapped
+ * @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_mapped(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct smack_known *skp;
+ char temp[80];
+ int i;
+
+ if (!smack_privileged(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;
+
+ /*
+ * Don't do anything if the value hasn't actually changed.
+ * If it is changing reset the level on entries that were
+ * set up to be mapped when they were created.
+ */
+ if (smack_cipso_mapped != i) {
+ mutex_lock(&smack_known_lock);
+ list_for_each_entry_rcu(skp, &smack_known_list, list)
+ if (skp->smk_netlabel.attr.mls.lvl ==
+ smack_cipso_mapped)
+ skp->smk_netlabel.attr.mls.lvl = i;
+ smack_cipso_mapped = i;
+ mutex_unlock(&smack_known_lock);
+ }
+
+ return count;
+}
+
+static const struct file_operations smk_mapped_ops = {
+ .read = smk_read_mapped,
+ .write = smk_write_mapped,
+ .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->smk_known) + 1;
+
+ if (cn >= asize)
+ rc = simple_read_from_buffer(buf, cn, ppos,
+ smack_net_ambient->smk_known,
+ 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)
+{
+ struct smack_known *skp;
+ char *oldambient;
+ char *data;
+ int rc = count;
+
+ if (!smack_privileged(CAP_MAC_ADMIN))
+ return -EPERM;
+
+ data = memdup_user_nul(buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ skp = smk_import_entry(data, count);
+ if (IS_ERR(skp)) {
+ rc = PTR_ERR(skp);
+ goto out;
+ }
+
+ mutex_lock(&smack_ambient_lock);
+
+ oldambient = smack_net_ambient->smk_known;
+ smack_net_ambient = skp;
+ smk_unlbl_ambient(oldambient);
+
+ mutex_unlock(&smack_ambient_lock);
+
+out:
+ kfree(data);
+ return rc;
+}
+
+static const struct file_operations smk_ambient_ops = {
+ .read = smk_read_ambient,
+ .write = smk_write_ambient,
+ .llseek = default_llseek,
+};
+
+/*
+ * Seq_file operations for /smack/onlycap
+ */
+static void *onlycap_seq_start(struct seq_file *s, loff_t *pos)
+{
+ return smk_seq_start(s, pos, &smack_onlycap_list);
+}
+
+static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ return smk_seq_next(s, v, pos, &smack_onlycap_list);
+}
+
+static int onlycap_seq_show(struct seq_file *s, void *v)
+{
+ struct list_head *list = v;
+ struct smack_known_list_elem *sklep =
+ list_entry_rcu(list, struct smack_known_list_elem, list);
+
+ seq_puts(s, sklep->smk_label->smk_known);
+ seq_putc(s, ' ');
+
+ return 0;
+}
+
+static const struct seq_operations onlycap_seq_ops = {
+ .start = onlycap_seq_start,
+ .next = onlycap_seq_next,
+ .show = onlycap_seq_show,
+ .stop = smk_seq_stop,
+};
+
+static int smk_open_onlycap(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &onlycap_seq_ops);
+}
+
+/**
+ * smk_list_swap_rcu - swap public list with a private one in RCU-safe way
+ * The caller must hold appropriate mutex to prevent concurrent modifications
+ * to the public list.
+ * Private list is assumed to be not accessible to other threads yet.
+ *
+ * @public: public list
+ * @private: private list
+ */
+static void smk_list_swap_rcu(struct list_head *public,
+ struct list_head *private)
+{
+ struct list_head *first, *last;
+
+ if (list_empty(public)) {
+ list_splice_init_rcu(private, public, synchronize_rcu);
+ } else {
+ /* Remember public list before replacing it */
+ first = public->next;
+ last = public->prev;
+
+ /* Publish private list in place of public in RCU-safe way */
+ private->prev->next = public;
+ private->next->prev = public;
+ rcu_assign_pointer(public->next, private->next);
+ public->prev = private->prev;
+
+ synchronize_rcu();
+
+ /* When all readers are done with the old public list,
+ * attach it in place of private */
+ private->next = first;
+ private->prev = last;
+ first->prev = private;
+ last->next = private;
+ }
+}
+
+/**
+ * smk_parse_label_list - parse list of Smack labels, separated by spaces
+ *
+ * @data: the string to parse
+ * @private: destination list
+ *
+ * Returns zero on success or error code, as appropriate
+ */
+static int smk_parse_label_list(char *data, struct list_head *list)
+{
+ char *tok;
+ struct smack_known *skp;
+ struct smack_known_list_elem *sklep;
+
+ while ((tok = strsep(&data, " ")) != NULL) {
+ if (!*tok)
+ continue;
+
+ skp = smk_import_entry(tok, 0);
+ if (IS_ERR(skp))
+ return PTR_ERR(skp);
+
+ sklep = kzalloc(sizeof(*sklep), GFP_KERNEL);
+ if (sklep == NULL)
+ return -ENOMEM;
+
+ sklep->smk_label = skp;
+ list_add(&sklep->list, list);
+ }
+
+ return 0;
+}
+
+/**
+ * smk_destroy_label_list - destroy a list of smack_known_list_elem
+ * @head: header pointer of the list to destroy
+ */
+void smk_destroy_label_list(struct list_head *list)
+{
+ struct smack_known_list_elem *sklep;
+ struct smack_known_list_elem *sklep2;
+
+ list_for_each_entry_safe(sklep, sklep2, list, list)
+ kfree(sklep);
+
+ INIT_LIST_HEAD(list);
+}
+
+/**
+ * smk_write_onlycap - write() for smackfs/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 *data;
+ LIST_HEAD(list_tmp);
+ int rc;
+
+ if (!smack_privileged(CAP_MAC_ADMIN))
+ return -EPERM;
+
+ data = memdup_user_nul(buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ rc = smk_parse_label_list(data, &list_tmp);
+ kfree(data);
+
+ /*
+ * Clear the smack_onlycap on invalid label errors. This means
+ * that we can pass a null string to unset the onlycap value.
+ *
+ * Importing will also reject a label beginning with '-',
+ * so "-usecapabilities" will also work.
+ *
+ * But do so only on invalid label, not on system errors.
+ * The invalid label must be first to count as clearing attempt.
+ */
+ if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
+ mutex_lock(&smack_onlycap_lock);
+ smk_list_swap_rcu(&smack_onlycap_list, &list_tmp);
+ mutex_unlock(&smack_onlycap_lock);
+ rc = count;
+ }
+
+ smk_destroy_label_list(&list_tmp);
+
+ return rc;
+}
+
+static const struct file_operations smk_onlycap_ops = {
+ .open = smk_open_onlycap,
+ .read = seq_read,
+ .write = smk_write_onlycap,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+#ifdef CONFIG_SECURITY_SMACK_BRINGUP
+/**
+ * smk_read_unconfined - read() for smackfs/unconfined
+ * @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_unconfined(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_unconfined != NULL)
+ smack = smack_unconfined->smk_known;
+
+ asize = strlen(smack) + 1;
+
+ if (cn >= asize)
+ rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
+
+ return rc;
+}
+
+/**
+ * smk_write_unconfined - write() for smackfs/unconfined
+ * @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_unconfined(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char *data;
+ struct smack_known *skp;
+ int rc = count;
+
+ if (!smack_privileged(CAP_MAC_ADMIN))
+ return -EPERM;
+
+ data = memdup_user_nul(buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ /*
+ * Clear the smack_unconfined on invalid label errors. This means
+ * that we can pass a null string to unset the unconfined value.
+ *
+ * Importing will also reject a label beginning with '-',
+ * so "-confine" will also work.
+ *
+ * But do so only on invalid label, not on system errors.
+ */
+ skp = smk_import_entry(data, count);
+ if (PTR_ERR(skp) == -EINVAL)
+ skp = NULL;
+ else if (IS_ERR(skp)) {
+ rc = PTR_ERR(skp);
+ goto freeout;
+ }
+
+ smack_unconfined = skp;
+
+freeout:
+ kfree(data);
+ return rc;
+}
+
+static const struct file_operations smk_unconfined_ops = {
+ .read = smk_read_unconfined,
+ .write = smk_write_unconfined,
+ .llseek = default_llseek,
+};
+#endif /* CONFIG_SECURITY_SMACK_BRINGUP */
+
+/**
+ * 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 (!smack_privileged(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_rcu(list, struct smack_rule, list);
+
+ smk_rule_show(s, srp, SMK_LABELLEN);
+
+ 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-self2
+ * @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_rules_list(file, buf, count, ppos, &tsp->smk_rules,
+ &tsp->smk_rules_lock, SMK_FIXED24_FMT);
+}
+
+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_user_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_user_access(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos, int format)
+{
+ struct smack_parsed_rule rule;
+ char *data;
+ int res;
+
+ data = simple_transaction_get(file, buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ if (format == SMK_FIXED24_FMT) {
+ if (count < SMK_LOADLEN)
+ return -EINVAL;
+ res = smk_parse_rule(data, &rule, 0);
+ } else {
+ /*
+ * simple_transaction_get() returns null-terminated data
+ */
+ res = smk_parse_long_rule(data, &rule, 0, 3);
+ }
+
+ if (res >= 0)
+ res = smk_access(rule.smk_subject, rule.smk_object,
+ rule.smk_access1, NULL);
+ else if (res != -ENOENT)
+ return res;
+
+ /*
+ * smk_access() can return a value > 0 in the "bringup" case.
+ */
+ data[0] = res >= 0 ? '1' : '0';
+ data[1] = '\0';
+
+ simple_transaction_set(file, 2);
+
+ if (format == SMK_FIXED24_FMT)
+ return SMK_LOADLEN;
+ return count;
+}
+
+/**
+ * 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)
+{
+ return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
+}
+
+static const struct file_operations smk_access_ops = {
+ .write = smk_write_access,
+ .read = simple_transaction_read,
+ .release = simple_transaction_release,
+ .llseek = generic_file_llseek,
+};
+
+
+/*
+ * Seq_file read operations for /smack/load2
+ */
+
+static int load2_seq_show(struct seq_file *s, void *v)
+{
+ struct list_head *list = v;
+ struct smack_master_list *smlp =
+ list_entry_rcu(list, struct smack_master_list, list);
+
+ smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL);
+
+ return 0;
+}
+
+static const struct seq_operations load2_seq_ops = {
+ .start = load2_seq_start,
+ .next = load2_seq_next,
+ .show = load2_seq_show,
+ .stop = smk_seq_stop,
+};
+
+/**
+ * smk_open_load2 - open() for /smack/load2
+ * @inode: inode structure representing file
+ * @file: "load2" file pointer
+ *
+ * For reading, use load2_seq_* seq_file reading operations.
+ */
+static int smk_open_load2(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &load2_seq_ops);
+}
+
+/**
+ * smk_write_load2 - write() for /smack/load2
+ * @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_load2(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ /*
+ * Must have privilege.
+ */
+ if (!smack_privileged(CAP_MAC_ADMIN))
+ return -EPERM;
+
+ return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
+ SMK_LONG_FMT);
+}
+
+static const struct file_operations smk_load2_ops = {
+ .open = smk_open_load2,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .write = smk_write_load2,
+ .release = seq_release,
+};
+
+/*
+ * Seq_file read operations for /smack/load-self2
+ */
+
+static void *load_self2_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_self2_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_self2_seq_show(struct seq_file *s, void *v)
+{
+ struct list_head *list = v;
+ struct smack_rule *srp =
+ list_entry_rcu(list, struct smack_rule, list);
+
+ smk_rule_show(s, srp, SMK_LONGLABEL);
+
+ return 0;
+}
+
+static const struct seq_operations load_self2_seq_ops = {
+ .start = load_self2_seq_start,
+ .next = load_self2_seq_next,
+ .show = load_self2_seq_show,
+ .stop = smk_seq_stop,
+};
+
+/**
+ * smk_open_load_self2 - open() for /smack/load-self2
+ * @inode: inode structure representing file
+ * @file: "load" file pointer
+ *
+ * For reading, use load_seq_* seq_file reading operations.
+ */
+static int smk_open_load_self2(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &load_self2_seq_ops);
+}
+
+/**
+ * smk_write_load_self2 - write() for /smack/load-self2
+ * @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_self2(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct task_smack *tsp = current_security();
+
+ return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
+ &tsp->smk_rules_lock, SMK_LONG_FMT);
+}
+
+static const struct file_operations smk_load_self2_ops = {
+ .open = smk_open_load_self2,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .write = smk_write_load_self2,
+ .release = seq_release,
+};
+
+/**
+ * smk_write_access2 - 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_access2(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
+}
+
+static const struct file_operations smk_access2_ops = {
+ .write = smk_write_access2,
+ .read = simple_transaction_read,
+ .release = simple_transaction_release,
+ .llseek = generic_file_llseek,
+};
+
+/**
+ * smk_write_revoke_subj - write() for /smack/revoke-subject
+ * @file: file pointer
+ * @buf: data from user space
+ * @count: bytes sent
+ * @ppos: where to start - must be 0
+ */
+static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char *data;
+ const char *cp;
+ struct smack_known *skp;
+ struct smack_rule *sp;
+ struct list_head *rule_list;
+ struct mutex *rule_lock;
+ int rc = count;
+
+ if (*ppos != 0)
+ return -EINVAL;
+
+ if (!smack_privileged(CAP_MAC_ADMIN))
+ return -EPERM;
+
+ if (count == 0 || count > SMK_LONGLABEL)
+ return -EINVAL;
+
+ data = memdup_user(buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ cp = smk_parse_smack(data, count);
+ if (IS_ERR(cp)) {
+ rc = PTR_ERR(cp);
+ goto out_data;
+ }
+
+ skp = smk_find_entry(cp);
+ if (skp == NULL)
+ goto out_cp;
+
+ rule_list = &skp->smk_rules;
+ rule_lock = &skp->smk_rules_lock;
+
+ mutex_lock(rule_lock);
+
+ list_for_each_entry_rcu(sp, rule_list, list)
+ sp->smk_access = 0;
+
+ mutex_unlock(rule_lock);
+
+out_cp:
+ kfree(cp);
+out_data:
+ kfree(data);
+
+ return rc;
+}
+
+static const struct file_operations smk_revoke_subj_ops = {
+ .write = smk_write_revoke_subj,
+ .read = simple_transaction_read,
+ .release = simple_transaction_release,
+ .llseek = generic_file_llseek,
+};
+
+/**
+ * smk_init_sysfs - initialize /sys/fs/smackfs
+ *
+ */
+static int smk_init_sysfs(void)
+{
+ return sysfs_create_mount_point(fs_kobj, "smackfs");
+}
+
+/**
+ * smk_write_change_rule - write() for /smack/change-rule
+ * @file: file pointer
+ * @buf: data from user space
+ * @count: bytes sent
+ * @ppos: where to start - must be 0
+ */
+static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ /*
+ * Must have privilege.
+ */
+ if (!smack_privileged(CAP_MAC_ADMIN))
+ return -EPERM;
+
+ return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
+ SMK_CHANGE_FMT);
+}
+
+static const struct file_operations smk_change_rule_ops = {
+ .write = smk_write_change_rule,
+ .read = simple_transaction_read,
+ .release = simple_transaction_release,
+ .llseek = generic_file_llseek,
+};
+
+/**
+ * smk_read_syslog - read() for smackfs/syslog
+ * @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_syslog(struct file *filp, char __user *buf,
+ size_t cn, loff_t *ppos)
+{
+ struct smack_known *skp;
+ ssize_t rc = -EINVAL;
+ int asize;
+
+ if (*ppos != 0)
+ return 0;
+
+ if (smack_syslog_label == NULL)
+ skp = &smack_known_star;
+ else
+ skp = smack_syslog_label;
+
+ asize = strlen(skp->smk_known) + 1;
+
+ if (cn >= asize)
+ rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
+ asize);
+
+ return rc;
+}
+
+/**
+ * smk_write_syslog - write() for smackfs/syslog
+ * @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_syslog(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char *data;
+ struct smack_known *skp;
+ int rc = count;
+
+ if (!smack_privileged(CAP_MAC_ADMIN))
+ return -EPERM;
+
+ data = memdup_user_nul(buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ skp = smk_import_entry(data, count);
+ if (IS_ERR(skp))
+ rc = PTR_ERR(skp);
+ else
+ smack_syslog_label = skp;
+
+ kfree(data);
+ return rc;
+}
+
+static const struct file_operations smk_syslog_ops = {
+ .read = smk_read_syslog,
+ .write = smk_write_syslog,
+ .llseek = default_llseek,
+};
+
+/*
+ * Seq_file read operations for /smack/relabel-self
+ */
+
+static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
+{
+ struct task_smack *tsp = current_security();
+
+ return smk_seq_start(s, pos, &tsp->smk_relabel);
+}
+
+static void *relabel_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_relabel);
+}
+
+static int relabel_self_seq_show(struct seq_file *s, void *v)
+{
+ struct list_head *list = v;
+ struct smack_known_list_elem *sklep =
+ list_entry(list, struct smack_known_list_elem, list);
+
+ seq_puts(s, sklep->smk_label->smk_known);
+ seq_putc(s, ' ');
+
+ return 0;
+}
+
+static const struct seq_operations relabel_self_seq_ops = {
+ .start = relabel_self_seq_start,
+ .next = relabel_self_seq_next,
+ .show = relabel_self_seq_show,
+ .stop = smk_seq_stop,
+};
+
+/**
+ * smk_open_relabel_self - open() for /smack/relabel-self
+ * @inode: inode structure representing file
+ * @file: "relabel-self" file pointer
+ *
+ * Connect our relabel_self_seq_* operations with /smack/relabel-self
+ * file_operations
+ */
+static int smk_open_relabel_self(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &relabel_self_seq_ops);
+}
+
+/**
+ * smk_write_relabel_self - write() for /smack/relabel-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_relabel_self(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct task_smack *tsp = current_security();
+ char *data;
+ int rc;
+ LIST_HEAD(list_tmp);
+
+ /*
+ * Must have privilege.
+ */
+ if (!smack_privileged(CAP_MAC_ADMIN))
+ return -EPERM;
+
+ /*
+ * Enough data must be present.
+ */
+ if (*ppos != 0)
+ return -EINVAL;
+
+ data = memdup_user_nul(buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ rc = smk_parse_label_list(data, &list_tmp);
+ kfree(data);
+
+ if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
+ smk_destroy_label_list(&tsp->smk_relabel);
+ list_splice(&list_tmp, &tsp->smk_relabel);
+ return count;
+ }
+
+ smk_destroy_label_list(&list_tmp);
+ return rc;
+}
+
+static const struct file_operations smk_relabel_self_ops = {
+ .open = smk_open_relabel_self,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .write = smk_write_relabel_self,
+ .release = seq_release,
+};
+
+/**
+ * smk_read_ptrace - read() for /smack/ptrace
+ * @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_ptrace(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", smack_ptrace_rule);
+ rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
+ return rc;
+}
+
+/**
+ * smk_write_ptrace - write() for /smack/ptrace
+ * @file: file pointer
+ * @buf: data from user space
+ * @count: bytes sent
+ * @ppos: where to start - must be 0
+ */
+static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char temp[32];
+ int i;
+
+ if (!smack_privileged(CAP_MAC_ADMIN))
+ return -EPERM;
+
+ if (*ppos != 0 || 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 < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
+ return -EINVAL;
+ smack_ptrace_rule = i;
+
+ return count;
+}
+
+static const struct file_operations smk_ptrace_ops = {
+ .write = smk_write_ptrace,
+ .read = smk_read_ptrace,
+ .llseek = default_llseek,
+};
+
+/**
+ * smk_fill_super - fill the smackfs superblock
+ * @sb: the empty superblock
+ * @data: unused
+ * @silent: unused
+ *
+ * Fill in the well known entries for the smack filesystem
+ *
+ * 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 const 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_NET4ADDR] = {
+ "netlabel", &smk_net4addr_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},
+ [SMK_MAPPED] = {
+ "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
+ [SMK_LOAD2] = {
+ "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
+ [SMK_LOAD_SELF2] = {
+ "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
+ [SMK_ACCESS2] = {
+ "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
+ [SMK_CIPSO2] = {
+ "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
+ [SMK_REVOKE_SUBJ] = {
+ "revoke-subject", &smk_revoke_subj_ops,
+ S_IRUGO|S_IWUSR},
+ [SMK_CHANGE_RULE] = {
+ "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
+ [SMK_SYSLOG] = {
+ "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
+ [SMK_PTRACE] = {
+ "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
+#ifdef CONFIG_SECURITY_SMACK_BRINGUP
+ [SMK_UNCONFINED] = {
+ "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR},
+#endif
+#if IS_ENABLED(CONFIG_IPV6)
+ [SMK_NET6ADDR] = {
+ "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR},
+#endif /* CONFIG_IPV6 */
+ [SMK_RELABEL_SELF] = {
+ "relabel-self", &smk_relabel_self_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 = d_inode(sb->s_root);
+
+ 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;
+
+static int __init smk_preset_netlabel(struct smack_known *skp)
+{
+ skp->smk_netlabel.domain = skp->smk_known;
+ skp->smk_netlabel.flags =
+ NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
+ return smk_netlbl_mls(smack_cipso_direct, skp->smk_known,
+ &skp->smk_netlabel, strlen(skp->smk_known));
+}
+
+/**
+ * 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;
+ int rc;
+
+ if (smack_enabled == 0)
+ return 0;
+
+ err = smk_init_sysfs();
+ if (err)
+ printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
+
+ 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);
+
+ rc = smk_preset_netlabel(&smack_known_floor);
+ if (err == 0 && rc < 0)
+ err = rc;
+ rc = smk_preset_netlabel(&smack_known_hat);
+ if (err == 0 && rc < 0)
+ err = rc;
+ rc = smk_preset_netlabel(&smack_known_huh);
+ if (err == 0 && rc < 0)
+ err = rc;
+ rc = smk_preset_netlabel(&smack_known_star);
+ if (err == 0 && rc < 0)
+ err = rc;
+ rc = smk_preset_netlabel(&smack_known_web);
+ if (err == 0 && rc < 0)
+ err = rc;
+
+ return err;
+}
+
+__initcall(init_smk_fs);