zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/security/smack/smack_lsm.c b/ap/os/linux/linux-3.4.x/security/smack/smack_lsm.c
new file mode 100644
index 0000000..82df24d
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/security/smack/smack_lsm.c
@@ -0,0 +1,3727 @@
+/*
+ * Simplified MAC Kernel (smack) security module
+ *
+ * This file contains the smack hook function implementations.
+ *
+ * Authors:
+ * Casey Schaufler <casey@schaufler-ca.com>
+ * Jarkko Sakkinen <jarkko.sakkinen@intel.com>
+ *
+ * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
+ * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
+ * Paul Moore <paul@paul-moore.com>
+ * Copyright (C) 2010 Nokia Corporation
+ * Copyright (C) 2011 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2,
+ * as published by the Free Software Foundation.
+ */
+
+#include <linux/xattr.h>
+#include <linux/pagemap.h>
+#include <linux/mount.h>
+#include <linux/stat.h>
+#include <linux/kd.h>
+#include <asm/ioctls.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
+#include <linux/pipe_fs_i.h>
+#include <net/netlabel.h>
+#include <net/cipso_ipv4.h>
+#include <linux/audit.h>
+#include <linux/magic.h>
+#include <linux/dcache.h>
+#include <linux/personality.h>
+#include <linux/msg.h>
+#include <linux/shm.h>
+#include <linux/binfmts.h>
+#include "smack.h"
+
+#define TRANS_TRUE "TRUE"
+#define TRANS_TRUE_SIZE 4
+
+/**
+ * smk_fetch - Fetch the smack label from a file.
+ * @ip: a pointer to the inode
+ * @dp: a pointer to the dentry
+ *
+ * Returns a pointer to the master list entry for the Smack label
+ * or NULL if there was no label to fetch.
+ */
+static char *smk_fetch(const char *name, struct inode *ip, struct dentry *dp)
+{
+ int rc;
+ char in[SMK_LABELLEN];
+
+ if (ip->i_op->getxattr == NULL)
+ return NULL;
+
+ rc = ip->i_op->getxattr(dp, name, in, SMK_LABELLEN);
+ if (rc < 0)
+ return NULL;
+
+ return smk_import(in, rc);
+}
+
+/**
+ * new_inode_smack - allocate an inode security blob
+ * @smack: a pointer to the Smack label to use in the blob
+ *
+ * Returns the new blob or NULL if there's no memory available
+ */
+struct inode_smack *new_inode_smack(char *smack)
+{
+ struct inode_smack *isp;
+
+ isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL);
+ if (isp == NULL)
+ return NULL;
+
+ isp->smk_inode = smack;
+ isp->smk_flags = 0;
+ mutex_init(&isp->smk_lock);
+
+ return isp;
+}
+
+/**
+ * new_task_smack - allocate a task security blob
+ * @smack: a pointer to the Smack label to use in the blob
+ *
+ * Returns the new blob or NULL if there's no memory available
+ */
+static struct task_smack *new_task_smack(char *task, char *forked, gfp_t gfp)
+{
+ struct task_smack *tsp;
+
+ tsp = kzalloc(sizeof(struct task_smack), gfp);
+ if (tsp == NULL)
+ return NULL;
+
+ tsp->smk_task = task;
+ tsp->smk_forked = forked;
+ INIT_LIST_HEAD(&tsp->smk_rules);
+ mutex_init(&tsp->smk_rules_lock);
+
+ return tsp;
+}
+
+/**
+ * smk_copy_rules - copy a rule set
+ * @nhead - new rules header pointer
+ * @ohead - old rules header pointer
+ *
+ * Returns 0 on success, -ENOMEM on error
+ */
+static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
+ gfp_t gfp)
+{
+ struct smack_rule *nrp;
+ struct smack_rule *orp;
+ int rc = 0;
+
+ INIT_LIST_HEAD(nhead);
+
+ list_for_each_entry_rcu(orp, ohead, list) {
+ nrp = kzalloc(sizeof(struct smack_rule), gfp);
+ if (nrp == NULL) {
+ rc = -ENOMEM;
+ break;
+ }
+ *nrp = *orp;
+ list_add_rcu(&nrp->list, nhead);
+ }
+ return rc;
+}
+
+/*
+ * LSM hooks.
+ * We he, that is fun!
+ */
+
+/**
+ * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
+ * @ctp: child task pointer
+ * @mode: ptrace attachment mode
+ *
+ * Returns 0 if access is OK, an error code otherwise
+ *
+ * Do the capability checks, and require read and write.
+ */
+static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
+{
+ int rc;
+ struct smk_audit_info ad;
+ char *tsp;
+
+ rc = cap_ptrace_access_check(ctp, mode);
+ if (rc != 0)
+ return rc;
+
+ tsp = smk_of_task_struct(ctp);
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
+ smk_ad_setfield_u_tsk(&ad, ctp);
+
+ rc = smk_curacc(tsp, MAY_READWRITE, &ad);
+ return rc;
+}
+
+/**
+ * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
+ * @ptp: parent task pointer
+ *
+ * Returns 0 if access is OK, an error code otherwise
+ *
+ * Do the capability checks, and require read and write.
+ */
+static int smack_ptrace_traceme(struct task_struct *ptp)
+{
+ int rc;
+ struct smk_audit_info ad;
+ char *tsp;
+
+ rc = cap_ptrace_traceme(ptp);
+ if (rc != 0)
+ return rc;
+
+ tsp = smk_of_task_struct(ptp);
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
+ smk_ad_setfield_u_tsk(&ad, ptp);
+
+ rc = smk_curacc(tsp, MAY_READWRITE, &ad);
+ return rc;
+}
+
+/**
+ * smack_syslog - Smack approval on syslog
+ * @type: message type
+ *
+ * Require that the task has the floor label
+ *
+ * Returns 0 on success, error code otherwise.
+ */
+static int smack_syslog(int typefrom_file)
+{
+ int rc = 0;
+ char *sp = smk_of_current();
+
+ if (capable(CAP_MAC_OVERRIDE))
+ return 0;
+
+ if (sp != smack_known_floor.smk_known)
+ rc = -EACCES;
+
+ return rc;
+}
+
+
+/*
+ * Superblock Hooks.
+ */
+
+/**
+ * smack_sb_alloc_security - allocate a superblock blob
+ * @sb: the superblock getting the blob
+ *
+ * Returns 0 on success or -ENOMEM on error.
+ */
+static int smack_sb_alloc_security(struct super_block *sb)
+{
+ struct superblock_smack *sbsp;
+
+ sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
+
+ if (sbsp == NULL)
+ return -ENOMEM;
+
+ sbsp->smk_root = smack_known_floor.smk_known;
+ sbsp->smk_default = smack_known_floor.smk_known;
+ sbsp->smk_floor = smack_known_floor.smk_known;
+ sbsp->smk_hat = smack_known_hat.smk_known;
+ sbsp->smk_initialized = 0;
+ spin_lock_init(&sbsp->smk_sblock);
+
+ sb->s_security = sbsp;
+
+ return 0;
+}
+
+/**
+ * smack_sb_free_security - free a superblock blob
+ * @sb: the superblock getting the blob
+ *
+ */
+static void smack_sb_free_security(struct super_block *sb)
+{
+ kfree(sb->s_security);
+ sb->s_security = NULL;
+}
+
+/**
+ * smack_sb_copy_data - copy mount options data for processing
+ * @orig: where to start
+ * @smackopts: mount options string
+ *
+ * Returns 0 on success or -ENOMEM on error.
+ *
+ * Copy the Smack specific mount options out of the mount
+ * options list.
+ */
+static int smack_sb_copy_data(char *orig, char *smackopts)
+{
+ char *cp, *commap, *otheropts, *dp;
+
+ otheropts = (char *)get_zeroed_page(GFP_KERNEL);
+ if (otheropts == NULL)
+ return -ENOMEM;
+
+ for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
+ if (strstr(cp, SMK_FSDEFAULT) == cp)
+ dp = smackopts;
+ else if (strstr(cp, SMK_FSFLOOR) == cp)
+ dp = smackopts;
+ else if (strstr(cp, SMK_FSHAT) == cp)
+ dp = smackopts;
+ else if (strstr(cp, SMK_FSROOT) == cp)
+ dp = smackopts;
+ else
+ dp = otheropts;
+
+ commap = strchr(cp, ',');
+ if (commap != NULL)
+ *commap = '\0';
+
+ if (*dp != '\0')
+ strcat(dp, ",");
+ strcat(dp, cp);
+ }
+
+ strcpy(orig, otheropts);
+ free_page((unsigned long)otheropts);
+
+ return 0;
+}
+
+/**
+ * smack_sb_kern_mount - Smack specific mount processing
+ * @sb: the file system superblock
+ * @flags: the mount flags
+ * @data: the smack mount options
+ *
+ * Returns 0 on success, an error code on failure
+ */
+static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
+{
+ struct dentry *root = sb->s_root;
+ struct inode *inode = root->d_inode;
+ struct superblock_smack *sp = sb->s_security;
+ struct inode_smack *isp;
+ char *op;
+ char *commap;
+ char *nsp;
+
+ spin_lock(&sp->smk_sblock);
+ if (sp->smk_initialized != 0) {
+ spin_unlock(&sp->smk_sblock);
+ return 0;
+ }
+ sp->smk_initialized = 1;
+ spin_unlock(&sp->smk_sblock);
+
+ for (op = data; op != NULL; op = commap) {
+ commap = strchr(op, ',');
+ if (commap != NULL)
+ *commap++ = '\0';
+
+ if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
+ op += strlen(SMK_FSHAT);
+ nsp = smk_import(op, 0);
+ if (nsp != NULL)
+ sp->smk_hat = nsp;
+ } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
+ op += strlen(SMK_FSFLOOR);
+ nsp = smk_import(op, 0);
+ if (nsp != NULL)
+ sp->smk_floor = nsp;
+ } else if (strncmp(op, SMK_FSDEFAULT,
+ strlen(SMK_FSDEFAULT)) == 0) {
+ op += strlen(SMK_FSDEFAULT);
+ nsp = smk_import(op, 0);
+ if (nsp != NULL)
+ sp->smk_default = nsp;
+ } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
+ op += strlen(SMK_FSROOT);
+ nsp = smk_import(op, 0);
+ if (nsp != NULL)
+ sp->smk_root = nsp;
+ }
+ }
+
+ /*
+ * Initialize the root inode.
+ */
+ isp = inode->i_security;
+ if (isp == NULL)
+ inode->i_security = new_inode_smack(sp->smk_root);
+ else
+ isp->smk_inode = sp->smk_root;
+
+ return 0;
+}
+
+/**
+ * smack_sb_statfs - Smack check on statfs
+ * @dentry: identifies the file system in question
+ *
+ * Returns 0 if current can read the floor of the filesystem,
+ * and error code otherwise
+ */
+static int smack_sb_statfs(struct dentry *dentry)
+{
+ struct superblock_smack *sbp = dentry->d_sb->s_security;
+ int rc;
+ struct smk_audit_info ad;
+
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
+ smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
+
+ rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
+ return rc;
+}
+
+/**
+ * smack_sb_mount - Smack check for mounting
+ * @dev_name: unused
+ * @path: mount point
+ * @type: unused
+ * @flags: unused
+ * @data: unused
+ *
+ * Returns 0 if current can write the floor of the filesystem
+ * being mounted on, an error code otherwise.
+ */
+static int smack_sb_mount(char *dev_name, struct path *path,
+ char *type, unsigned long flags, void *data)
+{
+ struct superblock_smack *sbp = path->dentry->d_sb->s_security;
+ struct smk_audit_info ad;
+
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
+ smk_ad_setfield_u_fs_path(&ad, *path);
+
+ return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
+}
+
+/**
+ * smack_sb_umount - Smack check for unmounting
+ * @mnt: file system to unmount
+ * @flags: unused
+ *
+ * Returns 0 if current can write the floor of the filesystem
+ * being unmounted, an error code otherwise.
+ */
+static int smack_sb_umount(struct vfsmount *mnt, int flags)
+{
+ struct superblock_smack *sbp;
+ struct smk_audit_info ad;
+ struct path path;
+
+ path.dentry = mnt->mnt_root;
+ path.mnt = mnt;
+
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
+ smk_ad_setfield_u_fs_path(&ad, path);
+
+ sbp = path.dentry->d_sb->s_security;
+ return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
+}
+
+/*
+ * BPRM hooks
+ */
+
+/**
+ * smack_bprm_set_creds - set creds for exec
+ * @bprm: the exec information
+ *
+ * Returns 0 if it gets a blob, -ENOMEM otherwise
+ */
+static int smack_bprm_set_creds(struct linux_binprm *bprm)
+{
+ struct inode *inode = bprm->file->f_path.dentry->d_inode;
+ struct task_smack *bsp = bprm->cred->security;
+ struct inode_smack *isp;
+ int rc;
+
+ rc = cap_bprm_set_creds(bprm);
+ if (rc != 0)
+ return rc;
+
+ if (bprm->cred_prepared)
+ return 0;
+
+ isp = inode->i_security;
+ if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
+ return 0;
+
+ if (bprm->unsafe)
+ return -EPERM;
+
+ bsp->smk_task = isp->smk_task;
+ bprm->per_clear |= PER_CLEAR_ON_SETID;
+
+ return 0;
+}
+
+/**
+ * smack_bprm_committing_creds - Prepare to install the new credentials
+ * from bprm.
+ *
+ * @bprm: binprm for exec
+ */
+static void smack_bprm_committing_creds(struct linux_binprm *bprm)
+{
+ struct task_smack *bsp = bprm->cred->security;
+
+ if (bsp->smk_task != bsp->smk_forked)
+ current->pdeath_signal = 0;
+}
+
+/**
+ * smack_bprm_secureexec - Return the decision to use secureexec.
+ * @bprm: binprm for exec
+ *
+ * Returns 0 on success.
+ */
+static int smack_bprm_secureexec(struct linux_binprm *bprm)
+{
+ struct task_smack *tsp = current_security();
+ int ret = cap_bprm_secureexec(bprm);
+
+ if (!ret && (tsp->smk_task != tsp->smk_forked))
+ ret = 1;
+
+ return ret;
+}
+
+/*
+ * Inode hooks
+ */
+
+/**
+ * smack_inode_alloc_security - allocate an inode blob
+ * @inode: the inode in need of a blob
+ *
+ * Returns 0 if it gets a blob, -ENOMEM otherwise
+ */
+static int smack_inode_alloc_security(struct inode *inode)
+{
+ inode->i_security = new_inode_smack(smk_of_current());
+ if (inode->i_security == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+/**
+ * smack_inode_free_security - free an inode blob
+ * @inode: the inode with a blob
+ *
+ * Clears the blob pointer in inode
+ */
+static void smack_inode_free_security(struct inode *inode)
+{
+ kfree(inode->i_security);
+ inode->i_security = NULL;
+}
+
+/**
+ * smack_inode_init_security - copy out the smack from an inode
+ * @inode: the inode
+ * @dir: unused
+ * @qstr: unused
+ * @name: where to put the attribute name
+ * @value: where to put the attribute value
+ * @len: where to put the length of the attribute
+ *
+ * Returns 0 if it all works out, -ENOMEM if there's no memory
+ */
+static int smack_inode_init_security(struct inode *inode, struct inode *dir,
+ const struct qstr *qstr, char **name,
+ void **value, size_t *len)
+{
+ struct smack_known *skp;
+ char *csp = smk_of_current();
+ char *isp = smk_of_inode(inode);
+ char *dsp = smk_of_inode(dir);
+ int may;
+
+ if (name) {
+ *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL);
+ if (*name == NULL)
+ return -ENOMEM;
+ }
+
+ if (value) {
+ skp = smk_find_entry(csp);
+ rcu_read_lock();
+ may = smk_access_entry(csp, dsp, &skp->smk_rules);
+ rcu_read_unlock();
+
+ /*
+ * If the access rule allows transmutation and
+ * the directory requests transmutation then
+ * by all means transmute.
+ */
+ if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
+ smk_inode_transmutable(dir))
+ isp = dsp;
+
+ *value = kstrdup(isp, GFP_KERNEL);
+ if (*value == NULL)
+ return -ENOMEM;
+ }
+
+ if (len)
+ *len = strlen(isp) + 1;
+
+ return 0;
+}
+
+/**
+ * smack_inode_link - Smack check on link
+ * @old_dentry: the existing object
+ * @dir: unused
+ * @new_dentry: the new object
+ *
+ * Returns 0 if access is permitted, an error code otherwise
+ */
+static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
+ struct dentry *new_dentry)
+{
+ char *isp;
+ struct smk_audit_info ad;
+ int rc;
+
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
+ smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
+
+ isp = smk_of_inode(old_dentry->d_inode);
+ rc = smk_curacc(isp, MAY_WRITE, &ad);
+
+ if (rc == 0 && new_dentry->d_inode != NULL) {
+ isp = smk_of_inode(new_dentry->d_inode);
+ smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
+ rc = smk_curacc(isp, MAY_WRITE, &ad);
+ }
+
+ return rc;
+}
+
+/**
+ * smack_inode_unlink - Smack check on inode deletion
+ * @dir: containing directory object
+ * @dentry: file to unlink
+ *
+ * Returns 0 if current can write the containing directory
+ * and the object, error code otherwise
+ */
+static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
+{
+ struct inode *ip = dentry->d_inode;
+ struct smk_audit_info ad;
+ int rc;
+
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
+ smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
+
+ /*
+ * You need write access to the thing you're unlinking
+ */
+ rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
+ if (rc == 0) {
+ /*
+ * You also need write access to the containing directory
+ */
+ smk_ad_setfield_u_fs_path_dentry(&ad, NULL);
+ smk_ad_setfield_u_fs_inode(&ad, dir);
+ rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
+ }
+ return rc;
+}
+
+/**
+ * smack_inode_rmdir - Smack check on directory deletion
+ * @dir: containing directory object
+ * @dentry: directory to unlink
+ *
+ * Returns 0 if current can write the containing directory
+ * and the directory, error code otherwise
+ */
+static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
+{
+ struct smk_audit_info ad;
+ int rc;
+
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
+ smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
+
+ /*
+ * You need write access to the thing you're removing
+ */
+ rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
+ if (rc == 0) {
+ /*
+ * You also need write access to the containing directory
+ */
+ smk_ad_setfield_u_fs_path_dentry(&ad, NULL);
+ smk_ad_setfield_u_fs_inode(&ad, dir);
+ rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
+ }
+
+ return rc;
+}
+
+/**
+ * smack_inode_rename - Smack check on rename
+ * @old_inode: the old directory
+ * @old_dentry: unused
+ * @new_inode: the new directory
+ * @new_dentry: unused
+ *
+ * Read and write access is required on both the old and
+ * new directories.
+ *
+ * Returns 0 if access is permitted, an error code otherwise
+ */
+static int smack_inode_rename(struct inode *old_inode,
+ struct dentry *old_dentry,
+ struct inode *new_inode,
+ struct dentry *new_dentry)
+{
+ int rc;
+ char *isp;
+ struct smk_audit_info ad;
+
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
+ smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
+
+ isp = smk_of_inode(old_dentry->d_inode);
+ rc = smk_curacc(isp, MAY_READWRITE, &ad);
+
+ if (rc == 0 && new_dentry->d_inode != NULL) {
+ isp = smk_of_inode(new_dentry->d_inode);
+ smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
+ rc = smk_curacc(isp, MAY_READWRITE, &ad);
+ }
+ return rc;
+}
+
+/**
+ * smack_inode_permission - Smack version of permission()
+ * @inode: the inode in question
+ * @mask: the access requested
+ *
+ * This is the important Smack hook.
+ *
+ * Returns 0 if access is permitted, -EACCES otherwise
+ */
+static int smack_inode_permission(struct inode *inode, int mask)
+{
+ struct smk_audit_info ad;
+ int no_block = mask & MAY_NOT_BLOCK;
+
+ mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
+ /*
+ * No permission to check. Existence test. Yup, it's there.
+ */
+ if (mask == 0)
+ return 0;
+
+ /* May be droppable after audit */
+ if (no_block)
+ return -ECHILD;
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
+ smk_ad_setfield_u_fs_inode(&ad, inode);
+ return smk_curacc(smk_of_inode(inode), mask, &ad);
+}
+
+/**
+ * smack_inode_setattr - Smack check for setting attributes
+ * @dentry: the object
+ * @iattr: for the force flag
+ *
+ * Returns 0 if access is permitted, an error code otherwise
+ */
+static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
+{
+ struct smk_audit_info ad;
+ /*
+ * Need to allow for clearing the setuid bit.
+ */
+ if (iattr->ia_valid & ATTR_FORCE)
+ return 0;
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
+ smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
+
+ return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
+}
+
+/**
+ * smack_inode_getattr - Smack check for getting attributes
+ * @mnt: unused
+ * @dentry: the object
+ *
+ * Returns 0 if access is permitted, an error code otherwise
+ */
+static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
+{
+ struct smk_audit_info ad;
+ struct path path;
+
+ path.dentry = dentry;
+ path.mnt = mnt;
+
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
+ smk_ad_setfield_u_fs_path(&ad, path);
+ return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
+}
+
+/**
+ * smack_inode_setxattr - Smack check for setting xattrs
+ * @dentry: the object
+ * @name: name of the attribute
+ * @value: unused
+ * @size: unused
+ * @flags: unused
+ *
+ * This protects the Smack attribute explicitly.
+ *
+ * Returns 0 if access is permitted, an error code otherwise
+ */
+static int smack_inode_setxattr(struct dentry *dentry, const char *name,
+ const void *value, size_t size, int flags)
+{
+ struct smk_audit_info ad;
+ int rc = 0;
+
+ if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
+ strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
+ strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
+ strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
+ strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
+ if (!capable(CAP_MAC_ADMIN))
+ rc = -EPERM;
+ /*
+ * check label validity here so import wont fail on
+ * post_setxattr
+ */
+ if (size == 0 || size >= SMK_LABELLEN ||
+ smk_import(value, size) == NULL)
+ rc = -EINVAL;
+ } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
+ if (!capable(CAP_MAC_ADMIN))
+ rc = -EPERM;
+ if (size != TRANS_TRUE_SIZE ||
+ strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
+ rc = -EINVAL;
+ } else
+ rc = cap_inode_setxattr(dentry, name, value, size, flags);
+
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
+ smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
+
+ if (rc == 0)
+ rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
+
+ return rc;
+}
+
+/**
+ * smack_inode_post_setxattr - Apply the Smack update approved above
+ * @dentry: object
+ * @name: attribute name
+ * @value: attribute value
+ * @size: attribute size
+ * @flags: unused
+ *
+ * Set the pointer in the inode blob to the entry found
+ * in the master label list.
+ */
+static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
+ const void *value, size_t size, int flags)
+{
+ char *nsp;
+ struct inode_smack *isp = dentry->d_inode->i_security;
+
+ if (strcmp(name, XATTR_NAME_SMACK) == 0) {
+ nsp = smk_import(value, size);
+ if (nsp != NULL)
+ isp->smk_inode = nsp;
+ else
+ isp->smk_inode = smack_known_invalid.smk_known;
+ } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
+ nsp = smk_import(value, size);
+ if (nsp != NULL)
+ isp->smk_task = nsp;
+ else
+ isp->smk_task = smack_known_invalid.smk_known;
+ } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
+ nsp = smk_import(value, size);
+ if (nsp != NULL)
+ isp->smk_mmap = nsp;
+ else
+ isp->smk_mmap = smack_known_invalid.smk_known;
+ } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
+ isp->smk_flags |= SMK_INODE_TRANSMUTE;
+
+ return;
+}
+
+/**
+ * smack_inode_getxattr - Smack check on getxattr
+ * @dentry: the object
+ * @name: unused
+ *
+ * Returns 0 if access is permitted, an error code otherwise
+ */
+static int smack_inode_getxattr(struct dentry *dentry, const char *name)
+{
+ struct smk_audit_info ad;
+
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
+ smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
+
+ return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
+}
+
+/**
+ * smack_inode_removexattr - Smack check on removexattr
+ * @dentry: the object
+ * @name: name of the attribute
+ *
+ * Removing the Smack attribute requires CAP_MAC_ADMIN
+ *
+ * Returns 0 if access is permitted, an error code otherwise
+ */
+static int smack_inode_removexattr(struct dentry *dentry, const char *name)
+{
+ struct inode_smack *isp;
+ struct smk_audit_info ad;
+ int rc = 0;
+
+ if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
+ strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
+ strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
+ strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
+ strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
+ strcmp(name, XATTR_NAME_SMACKMMAP)) {
+ if (!capable(CAP_MAC_ADMIN))
+ rc = -EPERM;
+ } else
+ rc = cap_inode_removexattr(dentry, name);
+
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
+ smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
+ if (rc == 0)
+ rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
+
+ if (rc == 0) {
+ isp = dentry->d_inode->i_security;
+ isp->smk_task = NULL;
+ isp->smk_mmap = NULL;
+ }
+
+ return rc;
+}
+
+/**
+ * smack_inode_getsecurity - get smack xattrs
+ * @inode: the object
+ * @name: attribute name
+ * @buffer: where to put the result
+ * @alloc: unused
+ *
+ * Returns the size of the attribute or an error code
+ */
+static int smack_inode_getsecurity(const struct inode *inode,
+ const char *name, void **buffer,
+ bool alloc)
+{
+ struct socket_smack *ssp;
+ struct socket *sock;
+ struct super_block *sbp;
+ struct inode *ip = (struct inode *)inode;
+ char *isp;
+ int ilen;
+ int rc = 0;
+
+ if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
+ isp = smk_of_inode(inode);
+ ilen = strlen(isp) + 1;
+ *buffer = isp;
+ return ilen;
+ }
+
+ /*
+ * The rest of the Smack xattrs are only on sockets.
+ */
+ sbp = ip->i_sb;
+ if (sbp->s_magic != SOCKFS_MAGIC)
+ return -EOPNOTSUPP;
+
+ sock = SOCKET_I(ip);
+ if (sock == NULL || sock->sk == NULL)
+ return -EOPNOTSUPP;
+
+ ssp = sock->sk->sk_security;
+
+ if (strcmp(name, XATTR_SMACK_IPIN) == 0)
+ isp = ssp->smk_in;
+ else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
+ isp = ssp->smk_out;
+ else
+ return -EOPNOTSUPP;
+
+ ilen = strlen(isp) + 1;
+ if (rc == 0) {
+ *buffer = isp;
+ rc = ilen;
+ }
+
+ return rc;
+}
+
+
+/**
+ * smack_inode_listsecurity - list the Smack attributes
+ * @inode: the object
+ * @buffer: where they go
+ * @buffer_size: size of buffer
+ *
+ * Returns 0 on success, -EINVAL otherwise
+ */
+static int smack_inode_listsecurity(struct inode *inode, char *buffer,
+ size_t buffer_size)
+{
+ int len = strlen(XATTR_NAME_SMACK);
+
+ if (buffer != NULL && len <= buffer_size) {
+ memcpy(buffer, XATTR_NAME_SMACK, len);
+ return len;
+ }
+ return -EINVAL;
+}
+
+/**
+ * smack_inode_getsecid - Extract inode's security id
+ * @inode: inode to extract the info from
+ * @secid: where result will be saved
+ */
+static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
+{
+ struct inode_smack *isp = inode->i_security;
+
+ *secid = smack_to_secid(isp->smk_inode);
+}
+
+/*
+ * File Hooks
+ */
+
+/**
+ * smack_file_permission - Smack check on file operations
+ * @file: unused
+ * @mask: unused
+ *
+ * Returns 0
+ *
+ * Should access checks be done on each read or write?
+ * UNICOS and SELinux say yes.
+ * Trusted Solaris, Trusted Irix, and just about everyone else says no.
+ *
+ * I'll say no for now. Smack does not do the frequent
+ * label changing that SELinux does.
+ */
+static int smack_file_permission(struct file *file, int mask)
+{
+ return 0;
+}
+
+/**
+ * smack_file_alloc_security - assign a file security blob
+ * @file: the object
+ *
+ * The security blob for a file is a pointer to the master
+ * label list, so no allocation is done.
+ *
+ * Returns 0
+ */
+static int smack_file_alloc_security(struct file *file)
+{
+ file->f_security = smk_of_current();
+ return 0;
+}
+
+/**
+ * smack_file_free_security - clear a file security blob
+ * @file: the object
+ *
+ * The security blob for a file is a pointer to the master
+ * label list, so no memory is freed.
+ */
+static void smack_file_free_security(struct file *file)
+{
+ file->f_security = NULL;
+}
+
+/**
+ * smack_file_ioctl - Smack check on ioctls
+ * @file: the object
+ * @cmd: what to do
+ * @arg: unused
+ *
+ * Relies heavily on the correct use of the ioctl command conventions.
+ *
+ * Returns 0 if allowed, error code otherwise
+ */
+static int smack_file_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ int rc = 0;
+ struct smk_audit_info ad;
+
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
+ smk_ad_setfield_u_fs_path(&ad, file->f_path);
+
+ if (_IOC_DIR(cmd) & _IOC_WRITE)
+ rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
+
+ if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
+ rc = smk_curacc(file->f_security, MAY_READ, &ad);
+
+ return rc;
+}
+
+/**
+ * smack_file_lock - Smack check on file locking
+ * @file: the object
+ * @cmd: unused
+ *
+ * Returns 0 if current has write access, error code otherwise
+ */
+static int smack_file_lock(struct file *file, unsigned int cmd)
+{
+ struct smk_audit_info ad;
+
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
+ smk_ad_setfield_u_fs_path(&ad, file->f_path);
+ return smk_curacc(file->f_security, MAY_WRITE, &ad);
+}
+
+/**
+ * smack_file_fcntl - Smack check on fcntl
+ * @file: the object
+ * @cmd: what action to check
+ * @arg: unused
+ *
+ * Generally these operations are harmless.
+ * File locking operations present an obvious mechanism
+ * for passing information, so they require write access.
+ *
+ * Returns 0 if current has access, error code otherwise
+ */
+static int smack_file_fcntl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct smk_audit_info ad;
+ int rc = 0;
+
+
+ switch (cmd) {
+ case F_GETLK:
+ case F_SETLK:
+ case F_SETLKW:
+ case F_SETOWN:
+ case F_SETSIG:
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
+ smk_ad_setfield_u_fs_path(&ad, file->f_path);
+ rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
+ break;
+ default:
+ break;
+ }
+
+ return rc;
+}
+
+/**
+ * smack_file_mmap :
+ * Check permissions for a mmap operation. The @file may be NULL, e.g.
+ * if mapping anonymous memory.
+ * @file contains the file structure for file to map (may be NULL).
+ * @reqprot contains the protection requested by the application.
+ * @prot contains the protection that will be applied by the kernel.
+ * @flags contains the operational flags.
+ * Return 0 if permission is granted.
+ */
+static int smack_file_mmap(struct file *file,
+ unsigned long reqprot, unsigned long prot,
+ unsigned long flags, unsigned long addr,
+ unsigned long addr_only)
+{
+ struct smack_known *skp;
+ struct smack_rule *srp;
+ struct task_smack *tsp;
+ char *sp;
+ char *msmack;
+ char *osmack;
+ struct inode_smack *isp;
+ struct dentry *dp;
+ int may;
+ int mmay;
+ int tmay;
+ int rc;
+
+ /* do DAC check on address space usage */
+ rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only);
+ if (rc || addr_only)
+ return rc;
+
+ if (file == NULL || file->f_dentry == NULL)
+ return 0;
+
+ dp = file->f_dentry;
+
+ if (dp->d_inode == NULL)
+ return 0;
+
+ isp = dp->d_inode->i_security;
+ if (isp->smk_mmap == NULL)
+ return 0;
+ msmack = isp->smk_mmap;
+
+ tsp = current_security();
+ sp = smk_of_current();
+ skp = smk_find_entry(sp);
+ rc = 0;
+
+ rcu_read_lock();
+ /*
+ * For each Smack rule associated with the subject
+ * label verify that the SMACK64MMAP also has access
+ * to that rule's object label.
+ */
+ list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
+ osmack = srp->smk_object;
+ /*
+ * Matching labels always allows access.
+ */
+ if (msmack == osmack)
+ continue;
+ /*
+ * If there is a matching local rule take
+ * that into account as well.
+ */
+ may = smk_access_entry(srp->smk_subject, osmack,
+ &tsp->smk_rules);
+ if (may == -ENOENT)
+ may = srp->smk_access;
+ else
+ may &= srp->smk_access;
+ /*
+ * If may is zero the SMACK64MMAP subject can't
+ * possibly have less access.
+ */
+ if (may == 0)
+ continue;
+
+ /*
+ * Fetch the global list entry.
+ * If there isn't one a SMACK64MMAP subject
+ * can't have as much access as current.
+ */
+ skp = smk_find_entry(msmack);
+ mmay = smk_access_entry(msmack, osmack, &skp->smk_rules);
+ if (mmay == -ENOENT) {
+ rc = -EACCES;
+ break;
+ }
+ /*
+ * If there is a local entry it modifies the
+ * potential access, too.
+ */
+ tmay = smk_access_entry(msmack, osmack, &tsp->smk_rules);
+ if (tmay != -ENOENT)
+ mmay &= tmay;
+
+ /*
+ * If there is any access available to current that is
+ * not available to a SMACK64MMAP subject
+ * deny access.
+ */
+ if ((may | mmay) != mmay) {
+ rc = -EACCES;
+ break;
+ }
+ }
+
+ rcu_read_unlock();
+
+ return rc;
+}
+
+/**
+ * smack_file_set_fowner - set the file security blob value
+ * @file: object in question
+ *
+ * Returns 0
+ * Further research may be required on this one.
+ */
+static int smack_file_set_fowner(struct file *file)
+{
+ file->f_security = smk_of_current();
+ return 0;
+}
+
+/**
+ * smack_file_send_sigiotask - Smack on sigio
+ * @tsk: The target task
+ * @fown: the object the signal come from
+ * @signum: unused
+ *
+ * Allow a privileged task to get signals even if it shouldn't
+ *
+ * Returns 0 if a subject with the object's smack could
+ * write to the task, an error code otherwise.
+ */
+static int smack_file_send_sigiotask(struct task_struct *tsk,
+ struct fown_struct *fown, int signum)
+{
+ struct file *file;
+ int rc;
+ char *tsp = smk_of_task(tsk->cred->security);
+ struct smk_audit_info ad;
+
+ /*
+ * struct fown_struct is never outside the context of a struct file
+ */
+ file = container_of(fown, struct file, f_owner);
+
+ /* we don't log here as rc can be overriden */
+ rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL);
+ if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
+ rc = 0;
+
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
+ smk_ad_setfield_u_tsk(&ad, tsk);
+ smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad);
+ return rc;
+}
+
+/**
+ * smack_file_receive - Smack file receive check
+ * @file: the object
+ *
+ * Returns 0 if current has access, error code otherwise
+ */
+static int smack_file_receive(struct file *file)
+{
+ int may = 0;
+ struct smk_audit_info ad;
+
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
+ smk_ad_setfield_u_fs_path(&ad, file->f_path);
+ /*
+ * This code relies on bitmasks.
+ */
+ if (file->f_mode & FMODE_READ)
+ may = MAY_READ;
+ if (file->f_mode & FMODE_WRITE)
+ may |= MAY_WRITE;
+
+ return smk_curacc(file->f_security, may, &ad);
+}
+
+/**
+ * smack_dentry_open - Smack dentry open processing
+ * @file: the object
+ * @cred: unused
+ *
+ * Set the security blob in the file structure.
+ *
+ * Returns 0
+ */
+static int smack_dentry_open(struct file *file, const struct cred *cred)
+{
+ struct inode_smack *isp = file->f_path.dentry->d_inode->i_security;
+
+ file->f_security = isp->smk_inode;
+
+ return 0;
+}
+
+/*
+ * Task hooks
+ */
+
+/**
+ * smack_cred_alloc_blank - "allocate" blank task-level security credentials
+ * @new: the new credentials
+ * @gfp: the atomicity of any memory allocations
+ *
+ * Prepare a blank set of credentials for modification. This must allocate all
+ * the memory the LSM module might require such that cred_transfer() can
+ * complete without error.
+ */
+static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
+{
+ struct task_smack *tsp;
+
+ tsp = new_task_smack(NULL, NULL, gfp);
+ if (tsp == NULL)
+ return -ENOMEM;
+
+ cred->security = tsp;
+
+ return 0;
+}
+
+
+/**
+ * smack_cred_free - "free" task-level security credentials
+ * @cred: the credentials in question
+ *
+ */
+static void smack_cred_free(struct cred *cred)
+{
+ struct task_smack *tsp = cred->security;
+ struct smack_rule *rp;
+ struct list_head *l;
+ struct list_head *n;
+
+ if (tsp == NULL)
+ return;
+ cred->security = NULL;
+
+ list_for_each_safe(l, n, &tsp->smk_rules) {
+ rp = list_entry(l, struct smack_rule, list);
+ list_del(&rp->list);
+ kfree(rp);
+ }
+ kfree(tsp);
+}
+
+/**
+ * smack_cred_prepare - prepare new set of credentials for modification
+ * @new: the new credentials
+ * @old: the original credentials
+ * @gfp: the atomicity of any memory allocations
+ *
+ * Prepare a new set of credentials for modification.
+ */
+static int smack_cred_prepare(struct cred *new, const struct cred *old,
+ gfp_t gfp)
+{
+ struct task_smack *old_tsp = old->security;
+ struct task_smack *new_tsp;
+ int rc;
+
+ new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
+ if (new_tsp == NULL)
+ return -ENOMEM;
+
+ rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
+ if (rc != 0)
+ return rc;
+
+ new->security = new_tsp;
+ return 0;
+}
+
+/**
+ * smack_cred_transfer - Transfer the old credentials to the new credentials
+ * @new: the new credentials
+ * @old: the original credentials
+ *
+ * Fill in a set of blank credentials from another set of credentials.
+ */
+static void smack_cred_transfer(struct cred *new, const struct cred *old)
+{
+ struct task_smack *old_tsp = old->security;
+ struct task_smack *new_tsp = new->security;
+
+ new_tsp->smk_task = old_tsp->smk_task;
+ new_tsp->smk_forked = old_tsp->smk_task;
+ mutex_init(&new_tsp->smk_rules_lock);
+ INIT_LIST_HEAD(&new_tsp->smk_rules);
+
+
+ /* cbs copy rule list */
+}
+
+/**
+ * smack_kernel_act_as - Set the subjective context in a set of credentials
+ * @new: points to the set of credentials to be modified.
+ * @secid: specifies the security ID to be set
+ *
+ * Set the security data for a kernel service.
+ */
+static int smack_kernel_act_as(struct cred *new, u32 secid)
+{
+ struct task_smack *new_tsp = new->security;
+ char *smack = smack_from_secid(secid);
+
+ if (smack == NULL)
+ return -EINVAL;
+
+ new_tsp->smk_task = smack;
+ return 0;
+}
+
+/**
+ * smack_kernel_create_files_as - Set the file creation label in a set of creds
+ * @new: points to the set of credentials to be modified
+ * @inode: points to the inode to use as a reference
+ *
+ * Set the file creation context in a set of credentials to the same
+ * as the objective context of the specified inode
+ */
+static int smack_kernel_create_files_as(struct cred *new,
+ struct inode *inode)
+{
+ struct inode_smack *isp = inode->i_security;
+ struct task_smack *tsp = new->security;
+
+ tsp->smk_forked = isp->smk_inode;
+ tsp->smk_task = isp->smk_inode;
+ return 0;
+}
+
+/**
+ * smk_curacc_on_task - helper to log task related access
+ * @p: the task object
+ * @access: the access requested
+ * @caller: name of the calling function for audit
+ *
+ * Return 0 if access is permitted
+ */
+static int smk_curacc_on_task(struct task_struct *p, int access,
+ const char *caller)
+{
+ struct smk_audit_info ad;
+
+ smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
+ smk_ad_setfield_u_tsk(&ad, p);
+ return smk_curacc(smk_of_task_struct(p), access, &ad);
+}
+
+/**
+ * smack_task_setpgid - Smack check on setting pgid
+ * @p: the task object
+ * @pgid: unused
+ *
+ * Return 0 if write access is permitted
+ */
+static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
+{
+ return smk_curacc_on_task(p, MAY_WRITE, __func__);
+}
+
+/**
+ * smack_task_getpgid - Smack access check for getpgid
+ * @p: the object task
+ *
+ * Returns 0 if current can read the object task, error code otherwise
+ */
+static int smack_task_getpgid(struct task_struct *p)
+{
+ return smk_curacc_on_task(p, MAY_READ, __func__);
+}
+
+/**
+ * smack_task_getsid - Smack access check for getsid
+ * @p: the object task
+ *
+ * Returns 0 if current can read the object task, error code otherwise
+ */
+static int smack_task_getsid(struct task_struct *p)
+{
+ return smk_curacc_on_task(p, MAY_READ, __func__);
+}
+
+/**
+ * smack_task_getsecid - get the secid of the task
+ * @p: the object task
+ * @secid: where to put the result
+ *
+ * Sets the secid to contain a u32 version of the smack label.
+ */
+static void smack_task_getsecid(struct task_struct *p, u32 *secid)
+{
+ *secid = smack_to_secid(smk_of_task_struct(p));
+}
+
+/**
+ * smack_task_setnice - Smack check on setting nice
+ * @p: the task object
+ * @nice: unused
+ *
+ * Return 0 if write access is permitted
+ */
+static int smack_task_setnice(struct task_struct *p, int nice)
+{
+ int rc;
+
+ rc = cap_task_setnice(p, nice);
+ if (rc == 0)
+ rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
+ return rc;
+}
+
+/**
+ * smack_task_setioprio - Smack check on setting ioprio
+ * @p: the task object
+ * @ioprio: unused
+ *
+ * Return 0 if write access is permitted
+ */
+static int smack_task_setioprio(struct task_struct *p, int ioprio)
+{
+ int rc;
+
+ rc = cap_task_setioprio(p, ioprio);
+ if (rc == 0)
+ rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
+ return rc;
+}
+
+/**
+ * smack_task_getioprio - Smack check on reading ioprio
+ * @p: the task object
+ *
+ * Return 0 if read access is permitted
+ */
+static int smack_task_getioprio(struct task_struct *p)
+{
+ return smk_curacc_on_task(p, MAY_READ, __func__);
+}
+
+/**
+ * smack_task_setscheduler - Smack check on setting scheduler
+ * @p: the task object
+ * @policy: unused
+ * @lp: unused
+ *
+ * Return 0 if read access is permitted
+ */
+static int smack_task_setscheduler(struct task_struct *p)
+{
+ int rc;
+
+ rc = cap_task_setscheduler(p);
+ if (rc == 0)
+ rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
+ return rc;
+}
+
+/**
+ * smack_task_getscheduler - Smack check on reading scheduler
+ * @p: the task object
+ *
+ * Return 0 if read access is permitted
+ */
+static int smack_task_getscheduler(struct task_struct *p)
+{
+ return smk_curacc_on_task(p, MAY_READ, __func__);
+}
+
+/**
+ * smack_task_movememory - Smack check on moving memory
+ * @p: the task object
+ *
+ * Return 0 if write access is permitted
+ */
+static int smack_task_movememory(struct task_struct *p)
+{
+ return smk_curacc_on_task(p, MAY_WRITE, __func__);
+}
+
+/**
+ * smack_task_kill - Smack check on signal delivery
+ * @p: the task object
+ * @info: unused
+ * @sig: unused
+ * @secid: identifies the smack to use in lieu of current's
+ *
+ * Return 0 if write access is permitted
+ *
+ * The secid behavior is an artifact of an SELinux hack
+ * in the USB code. Someday it may go away.
+ */
+static int smack_task_kill(struct task_struct *p, struct siginfo *info,
+ int sig, u32 secid)
+{
+ struct smk_audit_info ad;
+
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
+ smk_ad_setfield_u_tsk(&ad, p);
+ /*
+ * Sending a signal requires that the sender
+ * can write the receiver.
+ */
+ if (secid == 0)
+ return smk_curacc(smk_of_task_struct(p), MAY_WRITE,
+ &ad);
+ /*
+ * If the secid isn't 0 we're dealing with some USB IO
+ * specific behavior. This is not clean. For one thing
+ * we can't take privilege into account.
+ */
+ return smk_access(smack_from_secid(secid),
+ smk_of_task_struct(p), MAY_WRITE, &ad);
+}
+
+/**
+ * smack_task_wait - Smack access check for waiting
+ * @p: task to wait for
+ *
+ * Returns 0 if current can wait for p, error code otherwise
+ */
+static int smack_task_wait(struct task_struct *p)
+{
+ struct smk_audit_info ad;
+ char *sp = smk_of_current();
+ char *tsp;
+ int rc;
+
+ rcu_read_lock();
+ tsp = smk_of_forked(__task_cred(p)->security);
+ rcu_read_unlock();
+
+ /* we don't log here, we can be overriden */
+ rc = smk_access(tsp, sp, MAY_WRITE, NULL);
+ if (rc == 0)
+ goto out_log;
+
+ /*
+ * Allow the operation to succeed if either task
+ * has privilege to perform operations that might
+ * account for the smack labels having gotten to
+ * be different in the first place.
+ *
+ * This breaks the strict subject/object access
+ * control ideal, taking the object's privilege
+ * state into account in the decision as well as
+ * the smack value.
+ */
+ if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE))
+ rc = 0;
+ /* we log only if we didn't get overriden */
+ out_log:
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
+ smk_ad_setfield_u_tsk(&ad, p);
+ smack_log(tsp, sp, MAY_WRITE, rc, &ad);
+ return rc;
+}
+
+/**
+ * smack_task_to_inode - copy task smack into the inode blob
+ * @p: task to copy from
+ * @inode: inode to copy to
+ *
+ * Sets the smack pointer in the inode security blob
+ */
+static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
+{
+ struct inode_smack *isp = inode->i_security;
+ isp->smk_inode = smk_of_task_struct(p);
+}
+
+/*
+ * Socket hooks.
+ */
+
+/**
+ * smack_sk_alloc_security - Allocate a socket blob
+ * @sk: the socket
+ * @family: unused
+ * @gfp_flags: memory allocation flags
+ *
+ * Assign Smack pointers to current
+ *
+ * Returns 0 on success, -ENOMEM is there's no memory
+ */
+static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
+{
+ char *csp = smk_of_current();
+ struct socket_smack *ssp;
+
+ ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
+ if (ssp == NULL)
+ return -ENOMEM;
+
+ ssp->smk_in = csp;
+ ssp->smk_out = csp;
+ ssp->smk_packet = NULL;
+
+ sk->sk_security = ssp;
+
+ return 0;
+}
+
+/**
+ * smack_sk_free_security - Free a socket blob
+ * @sk: the socket
+ *
+ * Clears the blob pointer
+ */
+static void smack_sk_free_security(struct sock *sk)
+{
+ kfree(sk->sk_security);
+}
+
+/**
+* smack_host_label - check host based restrictions
+* @sip: the object end
+*
+* looks for host based access restrictions
+*
+* This version will only be appropriate for really small sets of single label
+* hosts. The caller is responsible for ensuring that the RCU read lock is
+* taken before calling this function.
+*
+* Returns the label of the far end or NULL if it's not special.
+*/
+static char *smack_host_label(struct sockaddr_in *sip)
+{
+ struct smk_netlbladdr *snp;
+ struct in_addr *siap = &sip->sin_addr;
+
+ if (siap->s_addr == 0)
+ return NULL;
+
+ list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list)
+ /*
+ * we break after finding the first match because
+ * the list is sorted from longest to shortest mask
+ * so we have found the most specific match
+ */
+ if ((&snp->smk_host.sin_addr)->s_addr ==
+ (siap->s_addr & (&snp->smk_mask)->s_addr)) {
+ /* we have found the special CIPSO option */
+ if (snp->smk_label == smack_cipso_option)
+ return NULL;
+ return snp->smk_label;
+ }
+
+ return NULL;
+}
+
+/**
+ * smack_set_catset - convert a capset to netlabel mls categories
+ * @catset: the Smack categories
+ * @sap: where to put the netlabel categories
+ *
+ * Allocates and fills attr.mls.cat
+ */
+static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap)
+{
+ unsigned char *cp;
+ unsigned char m;
+ int cat;
+ int rc;
+ int byte;
+
+ if (!catset)
+ return;
+
+ sap->flags |= NETLBL_SECATTR_MLS_CAT;
+ sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
+ sap->attr.mls.cat->startbit = 0;
+
+ for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++)
+ for (m = 0x80; m != 0; m >>= 1, cat++) {
+ if ((m & *cp) == 0)
+ continue;
+ rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat,
+ cat, GFP_ATOMIC);
+ }
+}
+
+/**
+ * smack_to_secattr - fill a secattr from a smack value
+ * @smack: the smack value
+ * @nlsp: where the result goes
+ *
+ * Casey says that CIPSO is good enough for now.
+ * It can be used to effect.
+ * It can also be abused to effect when necessary.
+ * Apologies to the TSIG group in general and GW in particular.
+ */
+static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp)
+{
+ struct smack_cipso cipso;
+ int rc;
+
+ nlsp->domain = smack;
+ nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
+
+ rc = smack_to_cipso(smack, &cipso);
+ if (rc == 0) {
+ nlsp->attr.mls.lvl = cipso.smk_level;
+ smack_set_catset(cipso.smk_catset, nlsp);
+ } else {
+ nlsp->attr.mls.lvl = smack_cipso_direct;
+ smack_set_catset(smack, nlsp);
+ }
+}
+
+/**
+ * smack_netlabel - Set the secattr on a socket
+ * @sk: the socket
+ * @labeled: socket label scheme
+ *
+ * Convert the outbound smack value (smk_out) to a
+ * secattr and attach it to the socket.
+ *
+ * Returns 0 on success or an error code
+ */
+static int smack_netlabel(struct sock *sk, int labeled)
+{
+ struct socket_smack *ssp = sk->sk_security;
+ struct netlbl_lsm_secattr secattr;
+ int rc = 0;
+
+ /*
+ * Usually the netlabel code will handle changing the
+ * packet labeling based on the label.
+ * The case of a single label host is different, because
+ * a single label host should never get a labeled packet
+ * even though the label is usually associated with a packet
+ * label.
+ */
+ local_bh_disable();
+ bh_lock_sock_nested(sk);
+
+ if (ssp->smk_out == smack_net_ambient ||
+ labeled == SMACK_UNLABELED_SOCKET)
+ netlbl_sock_delattr(sk);
+ else {
+ netlbl_secattr_init(&secattr);
+ smack_to_secattr(ssp->smk_out, &secattr);
+ rc = netlbl_sock_setattr(sk, sk->sk_family, &secattr);
+ netlbl_secattr_destroy(&secattr);
+ }
+
+ bh_unlock_sock(sk);
+ local_bh_enable();
+
+ return rc;
+}
+
+/**
+ * smack_netlbel_send - Set the secattr on a socket and perform access checks
+ * @sk: the socket
+ * @sap: the destination address
+ *
+ * Set the correct secattr for the given socket based on the destination
+ * address and perform any outbound access checks needed.
+ *
+ * Returns 0 on success or an error code.
+ *
+ */
+static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
+{
+ int rc;
+ int sk_lbl;
+ char *hostsp;
+ struct socket_smack *ssp = sk->sk_security;
+ struct smk_audit_info ad;
+
+ rcu_read_lock();
+ hostsp = smack_host_label(sap);
+ if (hostsp != NULL) {
+#ifdef CONFIG_AUDIT
+ struct lsm_network_audit net;
+
+ smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
+ ad.a.u.net->family = sap->sin_family;
+ ad.a.u.net->dport = sap->sin_port;
+ ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
+#endif
+ sk_lbl = SMACK_UNLABELED_SOCKET;
+ rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad);
+ } else {
+ sk_lbl = SMACK_CIPSO_SOCKET;
+ rc = 0;
+ }
+ rcu_read_unlock();
+ if (rc != 0)
+ return rc;
+
+ return smack_netlabel(sk, sk_lbl);
+}
+
+/**
+ * smack_inode_setsecurity - set smack xattrs
+ * @inode: the object
+ * @name: attribute name
+ * @value: attribute value
+ * @size: size of the attribute
+ * @flags: unused
+ *
+ * Sets the named attribute in the appropriate blob
+ *
+ * Returns 0 on success, or an error code
+ */
+static int smack_inode_setsecurity(struct inode *inode, const char *name,
+ const void *value, size_t size, int flags)
+{
+ char *sp;
+ struct inode_smack *nsp = inode->i_security;
+ struct socket_smack *ssp;
+ struct socket *sock;
+ int rc = 0;
+
+ if (value == NULL || size > SMK_LABELLEN || size == 0)
+ return -EACCES;
+
+ sp = smk_import(value, size);
+ if (sp == NULL)
+ return -EINVAL;
+
+ if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
+ nsp->smk_inode = sp;
+ nsp->smk_flags |= SMK_INODE_INSTANT;
+ return 0;
+ }
+ /*
+ * The rest of the Smack xattrs are only on sockets.
+ */
+ if (inode->i_sb->s_magic != SOCKFS_MAGIC)
+ return -EOPNOTSUPP;
+
+ sock = SOCKET_I(inode);
+ if (sock == NULL || sock->sk == NULL)
+ return -EOPNOTSUPP;
+
+ ssp = sock->sk->sk_security;
+
+ if (strcmp(name, XATTR_SMACK_IPIN) == 0)
+ ssp->smk_in = sp;
+ else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
+ ssp->smk_out = sp;
+ if (sock->sk->sk_family != PF_UNIX) {
+ rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
+ if (rc != 0)
+ printk(KERN_WARNING
+ "Smack: \"%s\" netlbl error %d.\n",
+ __func__, -rc);
+ }
+ } else
+ return -EOPNOTSUPP;
+
+ return 0;
+}
+
+/**
+ * smack_socket_post_create - finish socket setup
+ * @sock: the socket
+ * @family: protocol family
+ * @type: unused
+ * @protocol: unused
+ * @kern: unused
+ *
+ * Sets the netlabel information on the socket
+ *
+ * Returns 0 on success, and error code otherwise
+ */
+static int smack_socket_post_create(struct socket *sock, int family,
+ int type, int protocol, int kern)
+{
+ if (family != PF_INET || sock->sk == NULL)
+ return 0;
+ /*
+ * Set the outbound netlbl.
+ */
+ return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
+}
+
+/**
+ * smack_socket_connect - connect access check
+ * @sock: the socket
+ * @sap: the other end
+ * @addrlen: size of sap
+ *
+ * Verifies that a connection may be possible
+ *
+ * Returns 0 on success, and error code otherwise
+ */
+static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
+ int addrlen)
+{
+ if (sock->sk == NULL || sock->sk->sk_family != PF_INET)
+ return 0;
+ if (addrlen < sizeof(struct sockaddr_in))
+ return -EINVAL;
+
+ return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
+}
+
+/**
+ * smack_flags_to_may - convert S_ to MAY_ values
+ * @flags: the S_ value
+ *
+ * Returns the equivalent MAY_ value
+ */
+static int smack_flags_to_may(int flags)
+{
+ int may = 0;
+
+ if (flags & S_IRUGO)
+ may |= MAY_READ;
+ if (flags & S_IWUGO)
+ may |= MAY_WRITE;
+ if (flags & S_IXUGO)
+ may |= MAY_EXEC;
+
+ return may;
+}
+
+/**
+ * smack_msg_msg_alloc_security - Set the security blob for msg_msg
+ * @msg: the object
+ *
+ * Returns 0
+ */
+static int smack_msg_msg_alloc_security(struct msg_msg *msg)
+{
+ msg->security = smk_of_current();
+ return 0;
+}
+
+/**
+ * smack_msg_msg_free_security - Clear the security blob for msg_msg
+ * @msg: the object
+ *
+ * Clears the blob pointer
+ */
+static void smack_msg_msg_free_security(struct msg_msg *msg)
+{
+ msg->security = NULL;
+}
+
+/**
+ * smack_of_shm - the smack pointer for the shm
+ * @shp: the object
+ *
+ * Returns a pointer to the smack value
+ */
+static char *smack_of_shm(struct shmid_kernel *shp)
+{
+ return (char *)shp->shm_perm.security;
+}
+
+/**
+ * smack_shm_alloc_security - Set the security blob for shm
+ * @shp: the object
+ *
+ * Returns 0
+ */
+static int smack_shm_alloc_security(struct shmid_kernel *shp)
+{
+ struct kern_ipc_perm *isp = &shp->shm_perm;
+
+ isp->security = smk_of_current();
+ return 0;
+}
+
+/**
+ * smack_shm_free_security - Clear the security blob for shm
+ * @shp: the object
+ *
+ * Clears the blob pointer
+ */
+static void smack_shm_free_security(struct shmid_kernel *shp)
+{
+ struct kern_ipc_perm *isp = &shp->shm_perm;
+
+ isp->security = NULL;
+}
+
+/**
+ * smk_curacc_shm : check if current has access on shm
+ * @shp : the object
+ * @access : access requested
+ *
+ * Returns 0 if current has the requested access, error code otherwise
+ */
+static int smk_curacc_shm(struct shmid_kernel *shp, int access)
+{
+ char *ssp = smack_of_shm(shp);
+ struct smk_audit_info ad;
+
+#ifdef CONFIG_AUDIT
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
+ ad.a.u.ipc_id = shp->shm_perm.id;
+#endif
+ return smk_curacc(ssp, access, &ad);
+}
+
+/**
+ * smack_shm_associate - Smack access check for shm
+ * @shp: the object
+ * @shmflg: access requested
+ *
+ * Returns 0 if current has the requested access, error code otherwise
+ */
+static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
+{
+ int may;
+
+ may = smack_flags_to_may(shmflg);
+ return smk_curacc_shm(shp, may);
+}
+
+/**
+ * smack_shm_shmctl - Smack access check for shm
+ * @shp: the object
+ * @cmd: what it wants to do
+ *
+ * Returns 0 if current has the requested access, error code otherwise
+ */
+static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
+{
+ int may;
+
+ switch (cmd) {
+ case IPC_STAT:
+ case SHM_STAT:
+ may = MAY_READ;
+ break;
+ case IPC_SET:
+ case SHM_LOCK:
+ case SHM_UNLOCK:
+ case IPC_RMID:
+ may = MAY_READWRITE;
+ break;
+ case IPC_INFO:
+ case SHM_INFO:
+ /*
+ * System level information.
+ */
+ return 0;
+ default:
+ return -EINVAL;
+ }
+ return smk_curacc_shm(shp, may);
+}
+
+/**
+ * smack_shm_shmat - Smack access for shmat
+ * @shp: the object
+ * @shmaddr: unused
+ * @shmflg: access requested
+ *
+ * Returns 0 if current has the requested access, error code otherwise
+ */
+static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
+ int shmflg)
+{
+ int may;
+
+ may = smack_flags_to_may(shmflg);
+ return smk_curacc_shm(shp, may);
+}
+
+/**
+ * smack_of_sem - the smack pointer for the sem
+ * @sma: the object
+ *
+ * Returns a pointer to the smack value
+ */
+static char *smack_of_sem(struct sem_array *sma)
+{
+ return (char *)sma->sem_perm.security;
+}
+
+/**
+ * smack_sem_alloc_security - Set the security blob for sem
+ * @sma: the object
+ *
+ * Returns 0
+ */
+static int smack_sem_alloc_security(struct sem_array *sma)
+{
+ struct kern_ipc_perm *isp = &sma->sem_perm;
+
+ isp->security = smk_of_current();
+ return 0;
+}
+
+/**
+ * smack_sem_free_security - Clear the security blob for sem
+ * @sma: the object
+ *
+ * Clears the blob pointer
+ */
+static void smack_sem_free_security(struct sem_array *sma)
+{
+ struct kern_ipc_perm *isp = &sma->sem_perm;
+
+ isp->security = NULL;
+}
+
+/**
+ * smk_curacc_sem : check if current has access on sem
+ * @sma : the object
+ * @access : access requested
+ *
+ * Returns 0 if current has the requested access, error code otherwise
+ */
+static int smk_curacc_sem(struct sem_array *sma, int access)
+{
+ char *ssp = smack_of_sem(sma);
+ struct smk_audit_info ad;
+
+#ifdef CONFIG_AUDIT
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
+ ad.a.u.ipc_id = sma->sem_perm.id;
+#endif
+ return smk_curacc(ssp, access, &ad);
+}
+
+/**
+ * smack_sem_associate - Smack access check for sem
+ * @sma: the object
+ * @semflg: access requested
+ *
+ * Returns 0 if current has the requested access, error code otherwise
+ */
+static int smack_sem_associate(struct sem_array *sma, int semflg)
+{
+ int may;
+
+ may = smack_flags_to_may(semflg);
+ return smk_curacc_sem(sma, may);
+}
+
+/**
+ * smack_sem_shmctl - Smack access check for sem
+ * @sma: the object
+ * @cmd: what it wants to do
+ *
+ * Returns 0 if current has the requested access, error code otherwise
+ */
+static int smack_sem_semctl(struct sem_array *sma, int cmd)
+{
+ int may;
+
+ switch (cmd) {
+ case GETPID:
+ case GETNCNT:
+ case GETZCNT:
+ case GETVAL:
+ case GETALL:
+ case IPC_STAT:
+ case SEM_STAT:
+ may = MAY_READ;
+ break;
+ case SETVAL:
+ case SETALL:
+ case IPC_RMID:
+ case IPC_SET:
+ may = MAY_READWRITE;
+ break;
+ case IPC_INFO:
+ case SEM_INFO:
+ /*
+ * System level information
+ */
+ return 0;
+ default:
+ return -EINVAL;
+ }
+
+ return smk_curacc_sem(sma, may);
+}
+
+/**
+ * smack_sem_semop - Smack checks of semaphore operations
+ * @sma: the object
+ * @sops: unused
+ * @nsops: unused
+ * @alter: unused
+ *
+ * Treated as read and write in all cases.
+ *
+ * Returns 0 if access is allowed, error code otherwise
+ */
+static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
+ unsigned nsops, int alter)
+{
+ return smk_curacc_sem(sma, MAY_READWRITE);
+}
+
+/**
+ * smack_msg_alloc_security - Set the security blob for msg
+ * @msq: the object
+ *
+ * Returns 0
+ */
+static int smack_msg_queue_alloc_security(struct msg_queue *msq)
+{
+ struct kern_ipc_perm *kisp = &msq->q_perm;
+
+ kisp->security = smk_of_current();
+ return 0;
+}
+
+/**
+ * smack_msg_free_security - Clear the security blob for msg
+ * @msq: the object
+ *
+ * Clears the blob pointer
+ */
+static void smack_msg_queue_free_security(struct msg_queue *msq)
+{
+ struct kern_ipc_perm *kisp = &msq->q_perm;
+
+ kisp->security = NULL;
+}
+
+/**
+ * smack_of_msq - the smack pointer for the msq
+ * @msq: the object
+ *
+ * Returns a pointer to the smack value
+ */
+static char *smack_of_msq(struct msg_queue *msq)
+{
+ return (char *)msq->q_perm.security;
+}
+
+/**
+ * smk_curacc_msq : helper to check if current has access on msq
+ * @msq : the msq
+ * @access : access requested
+ *
+ * return 0 if current has access, error otherwise
+ */
+static int smk_curacc_msq(struct msg_queue *msq, int access)
+{
+ char *msp = smack_of_msq(msq);
+ struct smk_audit_info ad;
+
+#ifdef CONFIG_AUDIT
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
+ ad.a.u.ipc_id = msq->q_perm.id;
+#endif
+ return smk_curacc(msp, access, &ad);
+}
+
+/**
+ * smack_msg_queue_associate - Smack access check for msg_queue
+ * @msq: the object
+ * @msqflg: access requested
+ *
+ * Returns 0 if current has the requested access, error code otherwise
+ */
+static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
+{
+ int may;
+
+ may = smack_flags_to_may(msqflg);
+ return smk_curacc_msq(msq, may);
+}
+
+/**
+ * smack_msg_queue_msgctl - Smack access check for msg_queue
+ * @msq: the object
+ * @cmd: what it wants to do
+ *
+ * Returns 0 if current has the requested access, error code otherwise
+ */
+static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
+{
+ int may;
+
+ switch (cmd) {
+ case IPC_STAT:
+ case MSG_STAT:
+ may = MAY_READ;
+ break;
+ case IPC_SET:
+ case IPC_RMID:
+ may = MAY_READWRITE;
+ break;
+ case IPC_INFO:
+ case MSG_INFO:
+ /*
+ * System level information
+ */
+ return 0;
+ default:
+ return -EINVAL;
+ }
+
+ return smk_curacc_msq(msq, may);
+}
+
+/**
+ * smack_msg_queue_msgsnd - Smack access check for msg_queue
+ * @msq: the object
+ * @msg: unused
+ * @msqflg: access requested
+ *
+ * Returns 0 if current has the requested access, error code otherwise
+ */
+static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
+ int msqflg)
+{
+ int may;
+
+ may = smack_flags_to_may(msqflg);
+ return smk_curacc_msq(msq, may);
+}
+
+/**
+ * smack_msg_queue_msgsnd - Smack access check for msg_queue
+ * @msq: the object
+ * @msg: unused
+ * @target: unused
+ * @type: unused
+ * @mode: unused
+ *
+ * Returns 0 if current has read and write access, error code otherwise
+ */
+static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
+ struct task_struct *target, long type, int mode)
+{
+ return smk_curacc_msq(msq, MAY_READWRITE);
+}
+
+/**
+ * smack_ipc_permission - Smack access for ipc_permission()
+ * @ipp: the object permissions
+ * @flag: access requested
+ *
+ * Returns 0 if current has read and write access, error code otherwise
+ */
+static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
+{
+ char *isp = ipp->security;
+ int may = smack_flags_to_may(flag);
+ struct smk_audit_info ad;
+
+#ifdef CONFIG_AUDIT
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
+ ad.a.u.ipc_id = ipp->id;
+#endif
+ return smk_curacc(isp, may, &ad);
+}
+
+/**
+ * smack_ipc_getsecid - Extract smack security id
+ * @ipp: the object permissions
+ * @secid: where result will be saved
+ */
+static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
+{
+ char *smack = ipp->security;
+
+ *secid = smack_to_secid(smack);
+}
+
+/**
+ * smack_d_instantiate - Make sure the blob is correct on an inode
+ * @opt_dentry: dentry where inode will be attached
+ * @inode: the object
+ *
+ * Set the inode's security blob if it hasn't been done already.
+ */
+static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
+{
+ struct super_block *sbp;
+ struct superblock_smack *sbsp;
+ struct inode_smack *isp;
+ char *csp = smk_of_current();
+ char *fetched;
+ char *final;
+ char trattr[TRANS_TRUE_SIZE];
+ int transflag = 0;
+ struct dentry *dp;
+
+ if (inode == NULL)
+ return;
+
+ isp = inode->i_security;
+
+ mutex_lock(&isp->smk_lock);
+ /*
+ * If the inode is already instantiated
+ * take the quick way out
+ */
+ if (isp->smk_flags & SMK_INODE_INSTANT)
+ goto unlockandout;
+
+ sbp = inode->i_sb;
+ sbsp = sbp->s_security;
+ /*
+ * We're going to use the superblock default label
+ * if there's no label on the file.
+ */
+ final = sbsp->smk_default;
+
+ /*
+ * If this is the root inode the superblock
+ * may be in the process of initialization.
+ * If that is the case use the root value out
+ * of the superblock.
+ */
+ if (opt_dentry->d_parent == opt_dentry) {
+ isp->smk_inode = sbsp->smk_root;
+ isp->smk_flags |= SMK_INODE_INSTANT;
+ goto unlockandout;
+ }
+
+ /*
+ * This is pretty hackish.
+ * Casey says that we shouldn't have to do
+ * file system specific code, but it does help
+ * with keeping it simple.
+ */
+ switch (sbp->s_magic) {
+ case SMACK_MAGIC:
+ /*
+ * Casey says that it's a little embarrassing
+ * that the smack file system doesn't do
+ * extended attributes.
+ */
+ final = smack_known_star.smk_known;
+ break;
+ case PIPEFS_MAGIC:
+ /*
+ * Casey says pipes are easy (?)
+ */
+ final = smack_known_star.smk_known;
+ break;
+ case DEVPTS_SUPER_MAGIC:
+ /*
+ * devpts seems content with the label of the task.
+ * Programs that change smack have to treat the
+ * pty with respect.
+ */
+ final = csp;
+ break;
+ case SOCKFS_MAGIC:
+ /*
+ * Socket access is controlled by the socket
+ * structures associated with the task involved.
+ */
+ final = smack_known_star.smk_known;
+ break;
+ case PROC_SUPER_MAGIC:
+ /*
+ * Casey says procfs appears not to care.
+ * The superblock default suffices.
+ */
+ break;
+ case TMPFS_MAGIC:
+ /*
+ * Device labels should come from the filesystem,
+ * but watch out, because they're volitile,
+ * getting recreated on every reboot.
+ */
+ final = smack_known_star.smk_known;
+ /*
+ * No break.
+ *
+ * If a smack value has been set we want to use it,
+ * but since tmpfs isn't giving us the opportunity
+ * to set mount options simulate setting the
+ * superblock default.
+ */
+ default:
+ /*
+ * This isn't an understood special case.
+ * Get the value from the xattr.
+ */
+
+ /*
+ * UNIX domain sockets use lower level socket data.
+ */
+ if (S_ISSOCK(inode->i_mode)) {
+ final = smack_known_star.smk_known;
+ break;
+ }
+ /*
+ * No xattr support means, alas, no SMACK label.
+ * Use the aforeapplied default.
+ * It would be curious if the label of the task
+ * does not match that assigned.
+ */
+ if (inode->i_op->getxattr == NULL)
+ break;
+ /*
+ * Get the dentry for xattr.
+ */
+ dp = dget(opt_dentry);
+ fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp);
+ if (fetched != NULL) {
+ final = fetched;
+ if (S_ISDIR(inode->i_mode)) {
+ trattr[0] = '\0';
+ inode->i_op->getxattr(dp,
+ XATTR_NAME_SMACKTRANSMUTE,
+ trattr, TRANS_TRUE_SIZE);
+ if (strncmp(trattr, TRANS_TRUE,
+ TRANS_TRUE_SIZE) == 0)
+ transflag = SMK_INODE_TRANSMUTE;
+ }
+ }
+ isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
+ isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
+
+ dput(dp);
+ break;
+ }
+
+ if (final == NULL)
+ isp->smk_inode = csp;
+ else
+ isp->smk_inode = final;
+
+ isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
+
+unlockandout:
+ mutex_unlock(&isp->smk_lock);
+ return;
+}
+
+/**
+ * smack_getprocattr - Smack process attribute access
+ * @p: the object task
+ * @name: the name of the attribute in /proc/.../attr
+ * @value: where to put the result
+ *
+ * Places a copy of the task Smack into value
+ *
+ * Returns the length of the smack label or an error code
+ */
+static int smack_getprocattr(struct task_struct *p, char *name, char **value)
+{
+ char *cp;
+ int slen;
+
+ if (strcmp(name, "current") != 0)
+ return -EINVAL;
+
+ cp = kstrdup(smk_of_task_struct(p), GFP_KERNEL);
+ if (cp == NULL)
+ return -ENOMEM;
+
+ slen = strlen(cp);
+ *value = cp;
+ return slen;
+}
+
+/**
+ * smack_setprocattr - Smack process attribute setting
+ * @p: the object task
+ * @name: the name of the attribute in /proc/.../attr
+ * @value: the value to set
+ * @size: the size of the value
+ *
+ * Sets the Smack value of the task. Only setting self
+ * is permitted and only with privilege
+ *
+ * Returns the length of the smack label or an error code
+ */
+static int smack_setprocattr(struct task_struct *p, char *name,
+ void *value, size_t size)
+{
+ int rc;
+ struct task_smack *tsp;
+ struct task_smack *oldtsp;
+ struct cred *new;
+ char *newsmack;
+
+ /*
+ * Changing another process' Smack value is too dangerous
+ * and supports no sane use case.
+ */
+ if (p != current)
+ return -EPERM;
+
+ if (!capable(CAP_MAC_ADMIN))
+ return -EPERM;
+
+ if (value == NULL || size == 0 || size >= SMK_LABELLEN)
+ return -EINVAL;
+
+ if (strcmp(name, "current") != 0)
+ return -EINVAL;
+
+ newsmack = smk_import(value, size);
+ if (newsmack == NULL)
+ return -EINVAL;
+
+ /*
+ * No process is ever allowed the web ("@") label.
+ */
+ if (newsmack == smack_known_web.smk_known)
+ return -EPERM;
+
+ oldtsp = p->cred->security;
+ new = prepare_creds();
+ if (new == NULL)
+ return -ENOMEM;
+
+ tsp = new_task_smack(newsmack, oldtsp->smk_forked, GFP_KERNEL);
+ if (tsp == NULL) {
+ kfree(new);
+ return -ENOMEM;
+ }
+ rc = smk_copy_rules(&tsp->smk_rules, &oldtsp->smk_rules, GFP_KERNEL);
+ if (rc != 0)
+ return rc;
+
+ new->security = tsp;
+ commit_creds(new);
+ return size;
+}
+
+/**
+ * smack_unix_stream_connect - Smack access on UDS
+ * @sock: one sock
+ * @other: the other sock
+ * @newsk: unused
+ *
+ * Return 0 if a subject with the smack of sock could access
+ * an object with the smack of other, otherwise an error code
+ */
+static int smack_unix_stream_connect(struct sock *sock,
+ struct sock *other, struct sock *newsk)
+{
+ struct socket_smack *ssp = sock->sk_security;
+ struct socket_smack *osp = other->sk_security;
+ struct socket_smack *nsp = newsk->sk_security;
+ struct smk_audit_info ad;
+ int rc = 0;
+
+#ifdef CONFIG_AUDIT
+ struct lsm_network_audit net;
+
+ smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
+ smk_ad_setfield_u_net_sk(&ad, other);
+#endif
+
+ if (!capable(CAP_MAC_OVERRIDE))
+ rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
+
+ /*
+ * Cross reference the peer labels for SO_PEERSEC.
+ */
+ if (rc == 0) {
+ nsp->smk_packet = ssp->smk_out;
+ ssp->smk_packet = osp->smk_out;
+ }
+
+ return rc;
+}
+
+/**
+ * smack_unix_may_send - Smack access on UDS
+ * @sock: one socket
+ * @other: the other socket
+ *
+ * Return 0 if a subject with the smack of sock could access
+ * an object with the smack of other, otherwise an error code
+ */
+static int smack_unix_may_send(struct socket *sock, struct socket *other)
+{
+ struct socket_smack *ssp = sock->sk->sk_security;
+ struct socket_smack *osp = other->sk->sk_security;
+ struct smk_audit_info ad;
+ int rc = 0;
+
+#ifdef CONFIG_AUDIT
+ struct lsm_network_audit net;
+
+ smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
+ smk_ad_setfield_u_net_sk(&ad, other->sk);
+#endif
+
+ if (!capable(CAP_MAC_OVERRIDE))
+ rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
+
+ return rc;
+}
+
+/**
+ * smack_socket_sendmsg - Smack check based on destination host
+ * @sock: the socket
+ * @msg: the message
+ * @size: the size of the message
+ *
+ * Return 0 if the current subject can write to the destination
+ * host. This is only a question if the destination is a single
+ * label host.
+ */
+static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
+ int size)
+{
+ struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
+
+ /*
+ * Perfectly reasonable for this to be NULL
+ */
+ if (sip == NULL || sip->sin_family != AF_INET)
+ return 0;
+
+ return smack_netlabel_send(sock->sk, sip);
+}
+
+/**
+ * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
+ * @sap: netlabel secattr
+ * @ssp: socket security information
+ *
+ * Returns a pointer to a Smack label found on the label list.
+ */
+static char *smack_from_secattr(struct netlbl_lsm_secattr *sap,
+ struct socket_smack *ssp)
+{
+ struct smack_known *skp;
+ char smack[SMK_LABELLEN];
+ char *sp;
+ int pcat;
+
+ if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
+ /*
+ * Looks like a CIPSO packet.
+ * If there are flags but no level netlabel isn't
+ * behaving the way we expect it to.
+ *
+ * Get the categories, if any
+ * Without guidance regarding the smack value
+ * for the packet fall back on the network
+ * ambient value.
+ */
+ memset(smack, '\0', SMK_LABELLEN);
+ if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0)
+ for (pcat = -1;;) {
+ pcat = netlbl_secattr_catmap_walk(
+ sap->attr.mls.cat, pcat + 1);
+ if (pcat < 0)
+ break;
+ smack_catset_bit(pcat, smack);
+ }
+ /*
+ * If it is CIPSO using smack direct mapping
+ * we are already done. WeeHee.
+ */
+ if (sap->attr.mls.lvl == smack_cipso_direct) {
+ /*
+ * The label sent is usually on the label list.
+ *
+ * If it is not we may still want to allow the
+ * delivery.
+ *
+ * If the recipient is accepting all packets
+ * because it is using the star ("*") label
+ * for SMACK64IPIN provide the web ("@") label
+ * so that a directed response will succeed.
+ * This is not very correct from a MAC point
+ * of view, but gets around the problem that
+ * locking prevents adding the newly discovered
+ * label to the list.
+ * The case where the recipient is not using
+ * the star label should obviously fail.
+ * The easy way to do this is to provide the
+ * star label as the subject label.
+ */
+ skp = smk_find_entry(smack);
+ if (skp != NULL)
+ return skp->smk_known;
+ if (ssp != NULL &&
+ ssp->smk_in == smack_known_star.smk_known)
+ return smack_known_web.smk_known;
+ return smack_known_star.smk_known;
+ }
+ /*
+ * Look it up in the supplied table if it is not
+ * a direct mapping.
+ */
+ sp = smack_from_cipso(sap->attr.mls.lvl, smack);
+ if (sp != NULL)
+ return sp;
+ if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known)
+ return smack_known_web.smk_known;
+ return smack_known_star.smk_known;
+ }
+ if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
+ /*
+ * Looks like a fallback, which gives us a secid.
+ */
+ sp = smack_from_secid(sap->attr.secid);
+ /*
+ * This has got to be a bug because it is
+ * impossible to specify a fallback without
+ * specifying the label, which will ensure
+ * it has a secid, and the only way to get a
+ * secid is from a fallback.
+ */
+ BUG_ON(sp == NULL);
+ return sp;
+ }
+ /*
+ * Without guidance regarding the smack value
+ * for the packet fall back on the network
+ * ambient value.
+ */
+ return smack_net_ambient;
+}
+
+/**
+ * smack_socket_sock_rcv_skb - Smack packet delivery access check
+ * @sk: socket
+ * @skb: packet
+ *
+ * Returns 0 if the packet should be delivered, an error code otherwise
+ */
+static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
+{
+ struct netlbl_lsm_secattr secattr;
+ struct socket_smack *ssp = sk->sk_security;
+ char *csp;
+ int rc;
+ struct smk_audit_info ad;
+#ifdef CONFIG_AUDIT
+ struct lsm_network_audit net;
+#endif
+ if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
+ return 0;
+
+ /*
+ * Translate what netlabel gave us.
+ */
+ netlbl_secattr_init(&secattr);
+
+ rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
+ if (rc == 0)
+ csp = smack_from_secattr(&secattr, ssp);
+ else
+ csp = smack_net_ambient;
+
+ netlbl_secattr_destroy(&secattr);
+
+#ifdef CONFIG_AUDIT
+ smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
+ ad.a.u.net->family = sk->sk_family;
+ ad.a.u.net->netif = skb->skb_iif;
+ ipv4_skb_to_auditdata(skb, &ad.a, NULL);
+#endif
+ /*
+ * Receiving a packet requires that the other end
+ * be able to write here. Read access is not required.
+ * This is the simplist possible security model
+ * for networking.
+ */
+ rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad);
+ if (rc != 0)
+ netlbl_skbuff_err(skb, rc, 0);
+ return rc;
+}
+
+/**
+ * smack_socket_getpeersec_stream - pull in packet label
+ * @sock: the socket
+ * @optval: user's destination
+ * @optlen: size thereof
+ * @len: max thereof
+ *
+ * returns zero on success, an error code otherwise
+ */
+static int smack_socket_getpeersec_stream(struct socket *sock,
+ char __user *optval,
+ int __user *optlen, unsigned len)
+{
+ struct socket_smack *ssp;
+ char *rcp = "";
+ int slen = 1;
+ int rc = 0;
+
+ ssp = sock->sk->sk_security;
+ if (ssp->smk_packet != NULL) {
+ rcp = ssp->smk_packet;
+ slen = strlen(rcp) + 1;
+ }
+
+ if (slen > len)
+ rc = -ERANGE;
+ else if (copy_to_user(optval, rcp, slen) != 0)
+ rc = -EFAULT;
+
+ if (put_user(slen, optlen) != 0)
+ rc = -EFAULT;
+
+ return rc;
+}
+
+
+/**
+ * smack_socket_getpeersec_dgram - pull in packet label
+ * @sock: the peer socket
+ * @skb: packet data
+ * @secid: pointer to where to put the secid of the packet
+ *
+ * Sets the netlabel socket state on sk from parent
+ */
+static int smack_socket_getpeersec_dgram(struct socket *sock,
+ struct sk_buff *skb, u32 *secid)
+
+{
+ struct netlbl_lsm_secattr secattr;
+ struct socket_smack *ssp = NULL;
+ char *sp;
+ int family = PF_UNSPEC;
+ u32 s = 0; /* 0 is the invalid secid */
+ int rc;
+
+ if (skb != NULL) {
+ if (skb->protocol == htons(ETH_P_IP))
+ family = PF_INET;
+ else if (skb->protocol == htons(ETH_P_IPV6))
+ family = PF_INET6;
+ }
+ if (family == PF_UNSPEC && sock != NULL)
+ family = sock->sk->sk_family;
+
+ if (family == PF_UNIX) {
+ ssp = sock->sk->sk_security;
+ s = smack_to_secid(ssp->smk_out);
+ } else if (family == PF_INET || family == PF_INET6) {
+ /*
+ * Translate what netlabel gave us.
+ */
+ if (sock != NULL && sock->sk != NULL)
+ ssp = sock->sk->sk_security;
+ netlbl_secattr_init(&secattr);
+ rc = netlbl_skbuff_getattr(skb, family, &secattr);
+ if (rc == 0) {
+ sp = smack_from_secattr(&secattr, ssp);
+ s = smack_to_secid(sp);
+ }
+ netlbl_secattr_destroy(&secattr);
+ }
+ *secid = s;
+ if (s == 0)
+ return -EINVAL;
+ return 0;
+}
+
+/**
+ * smack_sock_graft - Initialize a newly created socket with an existing sock
+ * @sk: child sock
+ * @parent: parent socket
+ *
+ * Set the smk_{in,out} state of an existing sock based on the process that
+ * is creating the new socket.
+ */
+static void smack_sock_graft(struct sock *sk, struct socket *parent)
+{
+ struct socket_smack *ssp;
+
+ if (sk == NULL ||
+ (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
+ return;
+
+ ssp = sk->sk_security;
+ ssp->smk_in = ssp->smk_out = smk_of_current();
+ /* cssp->smk_packet is already set in smack_inet_csk_clone() */
+}
+
+/**
+ * smack_inet_conn_request - Smack access check on connect
+ * @sk: socket involved
+ * @skb: packet
+ * @req: unused
+ *
+ * Returns 0 if a task with the packet label could write to
+ * the socket, otherwise an error code
+ */
+static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
+ struct request_sock *req)
+{
+ u16 family = sk->sk_family;
+ struct socket_smack *ssp = sk->sk_security;
+ struct netlbl_lsm_secattr secattr;
+ struct sockaddr_in addr;
+ struct iphdr *hdr;
+ char *sp;
+ int rc;
+ struct smk_audit_info ad;
+#ifdef CONFIG_AUDIT
+ struct lsm_network_audit net;
+#endif
+
+ /* handle mapped IPv4 packets arriving via IPv6 sockets */
+ if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
+ family = PF_INET;
+
+ netlbl_secattr_init(&secattr);
+ rc = netlbl_skbuff_getattr(skb, family, &secattr);
+ if (rc == 0)
+ sp = smack_from_secattr(&secattr, ssp);
+ else
+ sp = smack_known_huh.smk_known;
+ netlbl_secattr_destroy(&secattr);
+
+#ifdef CONFIG_AUDIT
+ smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
+ ad.a.u.net->family = family;
+ ad.a.u.net->netif = skb->skb_iif;
+ ipv4_skb_to_auditdata(skb, &ad.a, NULL);
+#endif
+ /*
+ * Receiving a packet requires that the other end be able to write
+ * here. Read access is not required.
+ */
+ rc = smk_access(sp, ssp->smk_in, MAY_WRITE, &ad);
+ if (rc != 0)
+ return rc;
+
+ /*
+ * Save the peer's label in the request_sock so we can later setup
+ * smk_packet in the child socket so that SO_PEERCRED can report it.
+ */
+ req->peer_secid = smack_to_secid(sp);
+
+ /*
+ * We need to decide if we want to label the incoming connection here
+ * if we do we only need to label the request_sock and the stack will
+ * propagate the wire-label to the sock when it is created.
+ */
+ hdr = ip_hdr(skb);
+ addr.sin_addr.s_addr = hdr->saddr;
+ rcu_read_lock();
+ if (smack_host_label(&addr) == NULL) {
+ rcu_read_unlock();
+ netlbl_secattr_init(&secattr);
+ smack_to_secattr(sp, &secattr);
+ rc = netlbl_req_setattr(req, &secattr);
+ netlbl_secattr_destroy(&secattr);
+ } else {
+ rcu_read_unlock();
+ netlbl_req_delattr(req);
+ }
+
+ return rc;
+}
+
+/**
+ * smack_inet_csk_clone - Copy the connection information to the new socket
+ * @sk: the new socket
+ * @req: the connection's request_sock
+ *
+ * Transfer the connection's peer label to the newly created socket.
+ */
+static void smack_inet_csk_clone(struct sock *sk,
+ const struct request_sock *req)
+{
+ struct socket_smack *ssp = sk->sk_security;
+
+ if (req->peer_secid != 0)
+ ssp->smk_packet = smack_from_secid(req->peer_secid);
+ else
+ ssp->smk_packet = NULL;
+}
+
+/*
+ * Key management security hooks
+ *
+ * Casey has not tested key support very heavily.
+ * The permission check is most likely too restrictive.
+ * If you care about keys please have a look.
+ */
+#ifdef CONFIG_KEYS
+
+/**
+ * smack_key_alloc - Set the key security blob
+ * @key: object
+ * @cred: the credentials to use
+ * @flags: unused
+ *
+ * No allocation required
+ *
+ * Returns 0
+ */
+static int smack_key_alloc(struct key *key, const struct cred *cred,
+ unsigned long flags)
+{
+ key->security = smk_of_task(cred->security);
+ return 0;
+}
+
+/**
+ * smack_key_free - Clear the key security blob
+ * @key: the object
+ *
+ * Clear the blob pointer
+ */
+static void smack_key_free(struct key *key)
+{
+ key->security = NULL;
+}
+
+/*
+ * smack_key_permission - Smack access on a key
+ * @key_ref: gets to the object
+ * @cred: the credentials to use
+ * @perm: unused
+ *
+ * Return 0 if the task has read and write to the object,
+ * an error code otherwise
+ */
+static int smack_key_permission(key_ref_t key_ref,
+ const struct cred *cred, key_perm_t perm)
+{
+ struct key *keyp;
+ struct smk_audit_info ad;
+ char *tsp = smk_of_task(cred->security);
+
+ keyp = key_ref_to_ptr(key_ref);
+ if (keyp == NULL)
+ return -EINVAL;
+ /*
+ * If the key hasn't been initialized give it access so that
+ * it may do so.
+ */
+ if (keyp->security == NULL)
+ return 0;
+ /*
+ * This should not occur
+ */
+ if (tsp == NULL)
+ return -EACCES;
+#ifdef CONFIG_AUDIT
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
+ ad.a.u.key_struct.key = keyp->serial;
+ ad.a.u.key_struct.key_desc = keyp->description;
+#endif
+ return smk_access(tsp, keyp->security,
+ MAY_READWRITE, &ad);
+}
+#endif /* CONFIG_KEYS */
+
+/*
+ * Smack Audit hooks
+ *
+ * Audit requires a unique representation of each Smack specific
+ * rule. This unique representation is used to distinguish the
+ * object to be audited from remaining kernel objects and also
+ * works as a glue between the audit hooks.
+ *
+ * Since repository entries are added but never deleted, we'll use
+ * the smack_known label address related to the given audit rule as
+ * the needed unique representation. This also better fits the smack
+ * model where nearly everything is a label.
+ */
+#ifdef CONFIG_AUDIT
+
+/**
+ * smack_audit_rule_init - Initialize a smack audit rule
+ * @field: audit rule fields given from user-space (audit.h)
+ * @op: required testing operator (=, !=, >, <, ...)
+ * @rulestr: smack label to be audited
+ * @vrule: pointer to save our own audit rule representation
+ *
+ * Prepare to audit cases where (@field @op @rulestr) is true.
+ * The label to be audited is created if necessay.
+ */
+static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
+{
+ char **rule = (char **)vrule;
+ *rule = NULL;
+
+ if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
+ return -EINVAL;
+
+ if (op != Audit_equal && op != Audit_not_equal)
+ return -EINVAL;
+
+ *rule = smk_import(rulestr, 0);
+
+ return 0;
+}
+
+/**
+ * smack_audit_rule_known - Distinguish Smack audit rules
+ * @krule: rule of interest, in Audit kernel representation format
+ *
+ * This is used to filter Smack rules from remaining Audit ones.
+ * If it's proved that this rule belongs to us, the
+ * audit_rule_match hook will be called to do the final judgement.
+ */
+static int smack_audit_rule_known(struct audit_krule *krule)
+{
+ struct audit_field *f;
+ int i;
+
+ for (i = 0; i < krule->field_count; i++) {
+ f = &krule->fields[i];
+
+ if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
+ return 1;
+ }
+
+ return 0;
+}
+
+/**
+ * smack_audit_rule_match - Audit given object ?
+ * @secid: security id for identifying the object to test
+ * @field: audit rule flags given from user-space
+ * @op: required testing operator
+ * @vrule: smack internal rule presentation
+ * @actx: audit context associated with the check
+ *
+ * The core Audit hook. It's used to take the decision of
+ * whether to audit or not to audit a given object.
+ */
+static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
+ struct audit_context *actx)
+{
+ char *smack;
+ char *rule = vrule;
+
+ if (!rule) {
+ audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR,
+ "Smack: missing rule\n");
+ return -ENOENT;
+ }
+
+ if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
+ return 0;
+
+ smack = smack_from_secid(secid);
+
+ /*
+ * No need to do string comparisons. If a match occurs,
+ * both pointers will point to the same smack_known
+ * label.
+ */
+ if (op == Audit_equal)
+ return (rule == smack);
+ if (op == Audit_not_equal)
+ return (rule != smack);
+
+ return 0;
+}
+
+/**
+ * smack_audit_rule_free - free smack rule representation
+ * @vrule: rule to be freed.
+ *
+ * No memory was allocated.
+ */
+static void smack_audit_rule_free(void *vrule)
+{
+ /* No-op */
+}
+
+#endif /* CONFIG_AUDIT */
+
+/**
+ * smack_secid_to_secctx - return the smack label for a secid
+ * @secid: incoming integer
+ * @secdata: destination
+ * @seclen: how long it is
+ *
+ * Exists for networking code.
+ */
+static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
+{
+ char *sp = smack_from_secid(secid);
+
+ if (secdata)
+ *secdata = sp;
+ *seclen = strlen(sp);
+ return 0;
+}
+
+/**
+ * smack_secctx_to_secid - return the secid for a smack label
+ * @secdata: smack label
+ * @seclen: how long result is
+ * @secid: outgoing integer
+ *
+ * Exists for audit and networking code.
+ */
+static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
+{
+ *secid = smack_to_secid(secdata);
+ return 0;
+}
+
+/**
+ * smack_release_secctx - don't do anything.
+ * @secdata: unused
+ * @seclen: unused
+ *
+ * Exists to make sure nothing gets done, and properly
+ */
+static void smack_release_secctx(char *secdata, u32 seclen)
+{
+}
+
+static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
+{
+ return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
+}
+
+static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
+{
+ return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
+}
+
+static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
+{
+ int len = 0;
+ len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
+
+ if (len < 0)
+ return len;
+ *ctxlen = len;
+ return 0;
+}
+
+struct security_operations smack_ops = {
+ .name = "smack",
+
+ .ptrace_access_check = smack_ptrace_access_check,
+ .ptrace_traceme = smack_ptrace_traceme,
+ .syslog = smack_syslog,
+
+ .sb_alloc_security = smack_sb_alloc_security,
+ .sb_free_security = smack_sb_free_security,
+ .sb_copy_data = smack_sb_copy_data,
+ .sb_kern_mount = smack_sb_kern_mount,
+ .sb_statfs = smack_sb_statfs,
+ .sb_mount = smack_sb_mount,
+ .sb_umount = smack_sb_umount,
+
+ .bprm_set_creds = smack_bprm_set_creds,
+ .bprm_committing_creds = smack_bprm_committing_creds,
+ .bprm_secureexec = smack_bprm_secureexec,
+
+ .inode_alloc_security = smack_inode_alloc_security,
+ .inode_free_security = smack_inode_free_security,
+ .inode_init_security = smack_inode_init_security,
+ .inode_link = smack_inode_link,
+ .inode_unlink = smack_inode_unlink,
+ .inode_rmdir = smack_inode_rmdir,
+ .inode_rename = smack_inode_rename,
+ .inode_permission = smack_inode_permission,
+ .inode_setattr = smack_inode_setattr,
+ .inode_getattr = smack_inode_getattr,
+ .inode_setxattr = smack_inode_setxattr,
+ .inode_post_setxattr = smack_inode_post_setxattr,
+ .inode_getxattr = smack_inode_getxattr,
+ .inode_removexattr = smack_inode_removexattr,
+ .inode_getsecurity = smack_inode_getsecurity,
+ .inode_setsecurity = smack_inode_setsecurity,
+ .inode_listsecurity = smack_inode_listsecurity,
+ .inode_getsecid = smack_inode_getsecid,
+
+ .file_permission = smack_file_permission,
+ .file_alloc_security = smack_file_alloc_security,
+ .file_free_security = smack_file_free_security,
+ .file_ioctl = smack_file_ioctl,
+ .file_lock = smack_file_lock,
+ .file_fcntl = smack_file_fcntl,
+ .file_mmap = smack_file_mmap,
+ .file_set_fowner = smack_file_set_fowner,
+ .file_send_sigiotask = smack_file_send_sigiotask,
+ .file_receive = smack_file_receive,
+
+ .dentry_open = smack_dentry_open,
+
+ .cred_alloc_blank = smack_cred_alloc_blank,
+ .cred_free = smack_cred_free,
+ .cred_prepare = smack_cred_prepare,
+ .cred_transfer = smack_cred_transfer,
+ .kernel_act_as = smack_kernel_act_as,
+ .kernel_create_files_as = smack_kernel_create_files_as,
+ .task_setpgid = smack_task_setpgid,
+ .task_getpgid = smack_task_getpgid,
+ .task_getsid = smack_task_getsid,
+ .task_getsecid = smack_task_getsecid,
+ .task_setnice = smack_task_setnice,
+ .task_setioprio = smack_task_setioprio,
+ .task_getioprio = smack_task_getioprio,
+ .task_setscheduler = smack_task_setscheduler,
+ .task_getscheduler = smack_task_getscheduler,
+ .task_movememory = smack_task_movememory,
+ .task_kill = smack_task_kill,
+ .task_wait = smack_task_wait,
+ .task_to_inode = smack_task_to_inode,
+
+ .ipc_permission = smack_ipc_permission,
+ .ipc_getsecid = smack_ipc_getsecid,
+
+ .msg_msg_alloc_security = smack_msg_msg_alloc_security,
+ .msg_msg_free_security = smack_msg_msg_free_security,
+
+ .msg_queue_alloc_security = smack_msg_queue_alloc_security,
+ .msg_queue_free_security = smack_msg_queue_free_security,
+ .msg_queue_associate = smack_msg_queue_associate,
+ .msg_queue_msgctl = smack_msg_queue_msgctl,
+ .msg_queue_msgsnd = smack_msg_queue_msgsnd,
+ .msg_queue_msgrcv = smack_msg_queue_msgrcv,
+
+ .shm_alloc_security = smack_shm_alloc_security,
+ .shm_free_security = smack_shm_free_security,
+ .shm_associate = smack_shm_associate,
+ .shm_shmctl = smack_shm_shmctl,
+ .shm_shmat = smack_shm_shmat,
+
+ .sem_alloc_security = smack_sem_alloc_security,
+ .sem_free_security = smack_sem_free_security,
+ .sem_associate = smack_sem_associate,
+ .sem_semctl = smack_sem_semctl,
+ .sem_semop = smack_sem_semop,
+
+ .d_instantiate = smack_d_instantiate,
+
+ .getprocattr = smack_getprocattr,
+ .setprocattr = smack_setprocattr,
+
+ .unix_stream_connect = smack_unix_stream_connect,
+ .unix_may_send = smack_unix_may_send,
+
+ .socket_post_create = smack_socket_post_create,
+ .socket_connect = smack_socket_connect,
+ .socket_sendmsg = smack_socket_sendmsg,
+ .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
+ .socket_getpeersec_stream = smack_socket_getpeersec_stream,
+ .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
+ .sk_alloc_security = smack_sk_alloc_security,
+ .sk_free_security = smack_sk_free_security,
+ .sock_graft = smack_sock_graft,
+ .inet_conn_request = smack_inet_conn_request,
+ .inet_csk_clone = smack_inet_csk_clone,
+
+ /* key management security hooks */
+#ifdef CONFIG_KEYS
+ .key_alloc = smack_key_alloc,
+ .key_free = smack_key_free,
+ .key_permission = smack_key_permission,
+#endif /* CONFIG_KEYS */
+
+ /* Audit hooks */
+#ifdef CONFIG_AUDIT
+ .audit_rule_init = smack_audit_rule_init,
+ .audit_rule_known = smack_audit_rule_known,
+ .audit_rule_match = smack_audit_rule_match,
+ .audit_rule_free = smack_audit_rule_free,
+#endif /* CONFIG_AUDIT */
+
+ .secid_to_secctx = smack_secid_to_secctx,
+ .secctx_to_secid = smack_secctx_to_secid,
+ .release_secctx = smack_release_secctx,
+ .inode_notifysecctx = smack_inode_notifysecctx,
+ .inode_setsecctx = smack_inode_setsecctx,
+ .inode_getsecctx = smack_inode_getsecctx,
+};
+
+
+static __init void init_smack_known_list(void)
+{
+ /*
+ * Initialize CIPSO locks
+ */
+ spin_lock_init(&smack_known_huh.smk_cipsolock);
+ spin_lock_init(&smack_known_hat.smk_cipsolock);
+ spin_lock_init(&smack_known_star.smk_cipsolock);
+ spin_lock_init(&smack_known_floor.smk_cipsolock);
+ spin_lock_init(&smack_known_invalid.smk_cipsolock);
+ spin_lock_init(&smack_known_web.smk_cipsolock);
+ /*
+ * Initialize rule list locks
+ */
+ mutex_init(&smack_known_huh.smk_rules_lock);
+ mutex_init(&smack_known_hat.smk_rules_lock);
+ mutex_init(&smack_known_floor.smk_rules_lock);
+ mutex_init(&smack_known_star.smk_rules_lock);
+ mutex_init(&smack_known_invalid.smk_rules_lock);
+ mutex_init(&smack_known_web.smk_rules_lock);
+ /*
+ * Initialize rule lists
+ */
+ INIT_LIST_HEAD(&smack_known_huh.smk_rules);
+ INIT_LIST_HEAD(&smack_known_hat.smk_rules);
+ INIT_LIST_HEAD(&smack_known_star.smk_rules);
+ INIT_LIST_HEAD(&smack_known_floor.smk_rules);
+ INIT_LIST_HEAD(&smack_known_invalid.smk_rules);
+ INIT_LIST_HEAD(&smack_known_web.smk_rules);
+ /*
+ * Create the known labels list
+ */
+ list_add(&smack_known_huh.list, &smack_known_list);
+ list_add(&smack_known_hat.list, &smack_known_list);
+ list_add(&smack_known_star.list, &smack_known_list);
+ list_add(&smack_known_floor.list, &smack_known_list);
+ list_add(&smack_known_invalid.list, &smack_known_list);
+ list_add(&smack_known_web.list, &smack_known_list);
+}
+
+/**
+ * smack_init - initialize the smack system
+ *
+ * Returns 0
+ */
+static __init int smack_init(void)
+{
+ struct cred *cred;
+ struct task_smack *tsp;
+
+ if (!security_module_enable(&smack_ops))
+ return 0;
+
+ tsp = new_task_smack(smack_known_floor.smk_known,
+ smack_known_floor.smk_known, GFP_KERNEL);
+ if (tsp == NULL)
+ return -ENOMEM;
+
+ printk(KERN_INFO "Smack: Initializing.\n");
+
+ /*
+ * Set the security state for the initial task.
+ */
+ cred = (struct cred *) current->cred;
+ cred->security = tsp;
+
+ /* initialize the smack_known_list */
+ init_smack_known_list();
+
+ /*
+ * Register with LSM
+ */
+ if (register_security(&smack_ops))
+ panic("smack: Unable to register with kernel.\n");
+
+ return 0;
+}
+
+/*
+ * Smack requires early initialization in order to label
+ * all processes and objects when they are created.
+ */
+security_initcall(smack_init);