policydb.c

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/*
 * Implementation of the policy database.
 *
 * Author : Stephen Smalley, <[email protected]>
 */

/*
 * Updated: Trusted Computer Solutions, Inc. <[email protected]>
 *
 *  Support for enhanced MLS infrastructure.
 *
 * Updated: Frank Mayer <[email protected]> and Karl MacMillan <[email protected]>
 *
 *  Added conditional policy language extensions
 *
 * Updated: Hewlett-Packard <[email protected]>
 *
 *      Added support for the policy capability bitmap
 *
 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
 *  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.
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/audit.h>
#include <linux/flex_array.h>
#include "security.h"

#include "policydb.h"
#include "conditional.h"
#include "mls.h"
#include "services.h"

#define _DEBUG_HASHES

#ifdef DEBUG_HASHES
static const char *symtab_name[SYM_NUM] = {
    "common prefixes",
    "classes",
    "roles",
    "types",
    "users",
    "bools",
    "levels",
    "categories",
};
#endif

static unsigned int symtab_sizes[SYM_NUM] = {
    2,
    32,
    16,
    512,
    128,
    16,
    16,
    16,
};

struct policydb_compat_info {
    int version;
    int sym_num;
    int ocon_num;
};

/* These need to be updated if SYM_NUM or OCON_NUM changes */
static struct policydb_compat_info policydb_compat[] = {
    {
        .version    = POLICYDB_VERSION_BASE,
        .sym_num    = SYM_NUM - 3,
        .ocon_num   = OCON_NUM - 1,
    },
    {
        .version    = POLICYDB_VERSION_BOOL,
        .sym_num    = SYM_NUM - 2,
        .ocon_num   = OCON_NUM - 1,
    },
    {
        .version    = POLICYDB_VERSION_IPV6,
        .sym_num    = SYM_NUM - 2,
        .ocon_num   = OCON_NUM,
    },
    {
        .version    = POLICYDB_VERSION_NLCLASS,
        .sym_num    = SYM_NUM - 2,
        .ocon_num   = OCON_NUM,
    },
    {
        .version    = POLICYDB_VERSION_MLS,
        .sym_num    = SYM_NUM,
        .ocon_num   = OCON_NUM,
    },
    {
        .version    = POLICYDB_VERSION_AVTAB,
        .sym_num    = SYM_NUM,
        .ocon_num   = OCON_NUM,
    },
    {
        .version    = POLICYDB_VERSION_RANGETRANS,
        .sym_num    = SYM_NUM,
        .ocon_num   = OCON_NUM,
    },
    {
        .version    = POLICYDB_VERSION_POLCAP,
        .sym_num    = SYM_NUM,
        .ocon_num   = OCON_NUM,
    },
    {
        .version    = POLICYDB_VERSION_PERMISSIVE,
        .sym_num    = SYM_NUM,
        .ocon_num   = OCON_NUM,
    },
    {
        .version    = POLICYDB_VERSION_BOUNDARY,
        .sym_num    = SYM_NUM,
        .ocon_num   = OCON_NUM,
    },
    {
        .version    = POLICYDB_VERSION_FILENAME_TRANS,
        .sym_num    = SYM_NUM,
        .ocon_num   = OCON_NUM,
    },
    {
        .version    = POLICYDB_VERSION_ROLETRANS,
        .sym_num    = SYM_NUM,
        .ocon_num   = OCON_NUM,
    },
    {
        .version    = POLICYDB_VERSION_NEW_OBJECT_DEFAULTS,
        .sym_num    = SYM_NUM,
        .ocon_num   = OCON_NUM,
    },
    {
        .version    = POLICYDB_VERSION_DEFAULT_TYPE,
        .sym_num    = SYM_NUM,
        .ocon_num   = OCON_NUM,
    },
};

static struct policydb_compat_info *policydb_lookup_compat(int version)
{
    int i;
    struct policydb_compat_info *info = NULL;

    for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
        if (policydb_compat[i].version == version) {
            info = &policydb_compat[i];
            break;
        }
    }
    return info;
}

/*
 * Initialize the role table.
 */
static int roles_init(struct policydb *p)
{
    char *key = NULL;
    int rc;
    struct role_datum *role;

    rc = -ENOMEM;
    role = kzalloc(sizeof(*role), GFP_KERNEL);
    if (!role)
        goto out;

    rc = -EINVAL;
    role->value = ++p->p_roles.nprim;
    if (role->value != OBJECT_R_VAL)
        goto out;

    rc = -ENOMEM;
    key = kstrdup(OBJECT_R, GFP_KERNEL);
    if (!key)
        goto out;

    rc = hashtab_insert(p->p_roles.table, key, role);
    if (rc)
        goto out;

    return 0;
out:
    kfree(key);
    kfree(role);
    return rc;
}

static u32 filenametr_hash(struct hashtab *h, const void *k)
{
    const struct filename_trans *ft = k;
    unsigned long hash;
    unsigned int byte_num;
    unsigned char focus;

    hash = ft->stype ^ ft->ttype ^ ft->tclass;

    byte_num = 0;
    while ((focus = ft->name[byte_num++]))
        hash = partial_name_hash(focus, hash);
    return hash & (h->size - 1);
}

static int filenametr_cmp(struct hashtab *h, const void *k1, const void *k2)
{
    const struct filename_trans *ft1 = k1;
    const struct filename_trans *ft2 = k2;
    int v;

    v = ft1->stype - ft2->stype;
    if (v)
        return v;

    v = ft1->ttype - ft2->ttype;
    if (v)
        return v;

    v = ft1->tclass - ft2->tclass;
    if (v)
        return v;

    return strcmp(ft1->name, ft2->name);

}

static u32 rangetr_hash(struct hashtab *h, const void *k)
{
    const struct range_trans *key = k;
    return (key->source_type + (key->target_type << 3) +
        (key->target_class << 5)) & (h->size - 1);
}

static int rangetr_cmp(struct hashtab *h, const void *k1, const void *k2)
{
    const struct range_trans *key1 = k1, *key2 = k2;
    int v;

    v = key1->source_type - key2->source_type;
    if (v)
        return v;

    v = key1->target_type - key2->target_type;
    if (v)
        return v;

    v = key1->target_class - key2->target_class;

    return v;
}

/*
 * Initialize a policy database structure.
 */
static int policydb_init(struct policydb *p)
{
    int i, rc;

    memset(p, 0, sizeof(*p));

    for (i = 0; i < SYM_NUM; i++) {
        rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
        if (rc)
            goto out;
    }

    rc = avtab_init(&p->te_avtab);
    if (rc)
        goto out;

    rc = roles_init(p);
    if (rc)
        goto out;

    rc = cond_policydb_init(p);
    if (rc)
        goto out;

    p->filename_trans = hashtab_create(filenametr_hash, filenametr_cmp, (1 << 10));
    if (!p->filename_trans)
        goto out;

    p->range_tr = hashtab_create(rangetr_hash, rangetr_cmp, 256);
    if (!p->range_tr)
        goto out;

    ebitmap_init(&p->filename_trans_ttypes);
    ebitmap_init(&p->policycaps);
    ebitmap_init(&p->permissive_map);

    return 0;
out:
    hashtab_destroy(p->filename_trans);
    hashtab_destroy(p->range_tr);
    for (i = 0; i < SYM_NUM; i++)
        hashtab_destroy(p->symtab[i].table);
    return rc;
}

/*
 * The following *_index functions are used to
 * define the val_to_name and val_to_struct arrays
 * in a policy database structure.  The val_to_name
 * arrays are used when converting security context
 * structures into string representations.  The
 * val_to_struct arrays are used when the attributes
 * of a class, role, or user are needed.
 */

static int common_index(void *key, void *datum, void *datap)
{
    struct policydb *p;
    struct common_datum *comdatum;
    struct flex_array *fa;

    comdatum = datum;
    p = datap;
    if (!comdatum->value || comdatum->value > p->p_commons.nprim)
        return -EINVAL;

    fa = p->sym_val_to_name[SYM_COMMONS];
    if (flex_array_put_ptr(fa, comdatum->value - 1, key,
                   GFP_KERNEL | __GFP_ZERO))
        BUG();
    return 0;
}

static int class_index(void *key, void *datum, void *datap)
{
    struct policydb *p;
    struct class_datum *cladatum;
    struct flex_array *fa;

    cladatum = datum;
    p = datap;
    if (!cladatum->value || cladatum->value > p->p_classes.nprim)
        return -EINVAL;
    fa = p->sym_val_to_name[SYM_CLASSES];
    if (flex_array_put_ptr(fa, cladatum->value - 1, key,
                   GFP_KERNEL | __GFP_ZERO))
        BUG();
    p->class_val_to_struct[cladatum->value - 1] = cladatum;
    return 0;
}

static int role_index(void *key, void *datum, void *datap)
{
    struct policydb *p;
    struct role_datum *role;
    struct flex_array *fa;

    role = datum;
    p = datap;
    if (!role->value
        || role->value > p->p_roles.nprim
        || role->bounds > p->p_roles.nprim)
        return -EINVAL;

    fa = p->sym_val_to_name[SYM_ROLES];
    if (flex_array_put_ptr(fa, role->value - 1, key,
                   GFP_KERNEL | __GFP_ZERO))
        BUG();
    p->role_val_to_struct[role->value - 1] = role;
    return 0;
}

static int type_index(void *key, void *datum, void *datap)
{
    struct policydb *p;
    struct type_datum *typdatum;
    struct flex_array *fa;

    typdatum = datum;
    p = datap;

    if (typdatum->primary) {
        if (!typdatum->value
            || typdatum->value > p->p_types.nprim
            || typdatum->bounds > p->p_types.nprim)
            return -EINVAL;
        fa = p->sym_val_to_name[SYM_TYPES];
        if (flex_array_put_ptr(fa, typdatum->value - 1, key,
                       GFP_KERNEL | __GFP_ZERO))
            BUG();

        fa = p->type_val_to_struct_array;
        if (flex_array_put_ptr(fa, typdatum->value - 1, typdatum,
                       GFP_KERNEL | __GFP_ZERO))
            BUG();
    }

    return 0;
}

static int user_index(void *key, void *datum, void *datap)
{
    struct policydb *p;
    struct user_datum *usrdatum;
    struct flex_array *fa;

    usrdatum = datum;
    p = datap;
    if (!usrdatum->value
        || usrdatum->value > p->p_users.nprim
        || usrdatum->bounds > p->p_users.nprim)
        return -EINVAL;

    fa = p->sym_val_to_name[SYM_USERS];
    if (flex_array_put_ptr(fa, usrdatum->value - 1, key,
                   GFP_KERNEL | __GFP_ZERO))
        BUG();
    p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
    return 0;
}

static int sens_index(void *key, void *datum, void *datap)
{
    struct policydb *p;
    struct level_datum *levdatum;
    struct flex_array *fa;

    levdatum = datum;
    p = datap;

    if (!levdatum->isalias) {
        if (!levdatum->level->sens ||
            levdatum->level->sens > p->p_levels.nprim)
            return -EINVAL;
        fa = p->sym_val_to_name[SYM_LEVELS];
        if (flex_array_put_ptr(fa, levdatum->level->sens - 1, key,
                       GFP_KERNEL | __GFP_ZERO))
            BUG();
    }

    return 0;
}

static int cat_index(void *key, void *datum, void *datap)
{
    struct policydb *p;
    struct cat_datum *catdatum;
    struct flex_array *fa;

    catdatum = datum;
    p = datap;

    if (!catdatum->isalias) {
        if (!catdatum->value || catdatum->value > p->p_cats.nprim)
            return -EINVAL;
        fa = p->sym_val_to_name[SYM_CATS];
        if (flex_array_put_ptr(fa, catdatum->value - 1, key,
                       GFP_KERNEL | __GFP_ZERO))
            BUG();
    }

    return 0;
}

static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
{
    common_index,
    class_index,
    role_index,
    type_index,
    user_index,
    cond_index_bool,
    sens_index,
    cat_index,
};

#ifdef DEBUG_HASHES
static void hash_eval(struct hashtab *h, const char *hash_name)
{
    struct hashtab_info info;

    hashtab_stat(h, &info);
    printk(KERN_DEBUG "SELinux: %s:  %d entries and %d/%d buckets used, "
           "longest chain length %d\n", hash_name, h->nel,
           info.slots_used, h->size, info.max_chain_len);
}

static void symtab_hash_eval(struct symtab *s)
{
    int i;

    for (i = 0; i < SYM_NUM; i++)
        hash_eval(s[i].table, symtab_name[i]);
}

#else
static inline void hash_eval(struct hashtab *h, char *hash_name)
{
}
#endif

/*
 * Define the other val_to_name and val_to_struct arrays
 * in a policy database structure.
 *
 * Caller must clean up on failure.
 */
static int policydb_index(struct policydb *p)
{
    int i, rc;

    printk(KERN_DEBUG "SELinux:  %d users, %d roles, %d types, %d bools",
           p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim);
    if (p->mls_enabled)
        printk(", %d sens, %d cats", p->p_levels.nprim,
               p->p_cats.nprim);
    printk("\n");

    printk(KERN_DEBUG "SELinux:  %d classes, %d rules\n",
           p->p_classes.nprim, p->te_avtab.nel);

#ifdef DEBUG_HASHES
    avtab_hash_eval(&p->te_avtab, "rules");
    symtab_hash_eval(p->symtab);
#endif

    rc = -ENOMEM;
    p->class_val_to_struct =
        kmalloc(p->p_classes.nprim * sizeof(*(p->class_val_to_struct)),
            GFP_KERNEL);
    if (!p->class_val_to_struct)
        goto out;

    rc = -ENOMEM;
    p->role_val_to_struct =
        kmalloc(p->p_roles.nprim * sizeof(*(p->role_val_to_struct)),
            GFP_KERNEL);
    if (!p->role_val_to_struct)
        goto out;

    rc = -ENOMEM;
    p->user_val_to_struct =
        kmalloc(p->p_users.nprim * sizeof(*(p->user_val_to_struct)),
            GFP_KERNEL);
    if (!p->user_val_to_struct)
        goto out;

    /* Yes, I want the sizeof the pointer, not the structure */
    rc = -ENOMEM;
    p->type_val_to_struct_array = flex_array_alloc(sizeof(struct type_datum *),
                               p->p_types.nprim,
                               GFP_KERNEL | __GFP_ZERO);
    if (!p->type_val_to_struct_array)
        goto out;

    rc = flex_array_prealloc(p->type_val_to_struct_array, 0,
                 p->p_types.nprim, GFP_KERNEL | __GFP_ZERO);
    if (rc)
        goto out;

    rc = cond_init_bool_indexes(p);
    if (rc)
        goto out;

    for (i = 0; i < SYM_NUM; i++) {
        rc = -ENOMEM;
        p->sym_val_to_name[i] = flex_array_alloc(sizeof(char *),
                             p->symtab[i].nprim,
                             GFP_KERNEL | __GFP_ZERO);
        if (!p->sym_val_to_name[i])
            goto out;

        rc = flex_array_prealloc(p->sym_val_to_name[i],
                     0, p->symtab[i].nprim,
                     GFP_KERNEL | __GFP_ZERO);
        if (rc)
            goto out;

        rc = hashtab_map(p->symtab[i].table, index_f[i], p);
        if (rc)
            goto out;
    }
    rc = 0;
out:
    return rc;
}

/*
 * The following *_destroy functions are used to
 * free any memory allocated for each kind of
 * symbol data in the policy database.
 */

static int perm_destroy(void *key, void *datum, void *p)
{
    kfree(key);
    kfree(datum);
    return 0;
}

static int common_destroy(void *key, void *datum, void *p)
{
    struct common_datum *comdatum;

    kfree(key);
    if (datum) {
        comdatum = datum;
        hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
        hashtab_destroy(comdatum->permissions.table);
    }
    kfree(datum);
    return 0;
}

static int cls_destroy(void *key, void *datum, void *p)
{
    struct class_datum *cladatum;
    struct constraint_node *constraint, *ctemp;
    struct constraint_expr *e, *etmp;

    kfree(key);
    if (datum) {
        cladatum = datum;
        hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
        hashtab_destroy(cladatum->permissions.table);
        constraint = cladatum->constraints;
        while (constraint) {
            e = constraint->expr;
            while (e) {
                ebitmap_destroy(&e->names);
                etmp = e;
                e = e->next;
                kfree(etmp);
            }
            ctemp = constraint;
            constraint = constraint->next;
            kfree(ctemp);
        }

        constraint = cladatum->validatetrans;
        while (constraint) {
            e = constraint->expr;
            while (e) {
                ebitmap_destroy(&e->names);
                etmp = e;
                e = e->next;
                kfree(etmp);
            }
            ctemp = constraint;
            constraint = constraint->next;
            kfree(ctemp);
        }

        kfree(cladatum->comkey);
    }
    kfree(datum);
    return 0;
}

static int role_destroy(void *key, void *datum, void *p)
{
    struct role_datum *role;

    kfree(key);
    if (datum) {
        role = datum;
        ebitmap_destroy(&role->dominates);
        ebitmap_destroy(&role->types);
    }
    kfree(datum);
    return 0;
}

static int type_destroy(void *key, void *datum, void *p)
{
    kfree(key);
    kfree(datum);
    return 0;
}

static int user_destroy(void *key, void *datum, void *p)
{
    struct user_datum *usrdatum;

    kfree(key);
    if (datum) {
        usrdatum = datum;
        ebitmap_destroy(&usrdatum->roles);
        ebitmap_destroy(&usrdatum->range.level[0].cat);
        ebitmap_destroy(&usrdatum->range.level[1].cat);
        ebitmap_destroy(&usrdatum->dfltlevel.cat);
    }
    kfree(datum);
    return 0;
}

static int sens_destroy(void *key, void *datum, void *p)
{
    struct level_datum *levdatum;

    kfree(key);
    if (datum) {
        levdatum = datum;
        ebitmap_destroy(&levdatum->level->cat);
        kfree(levdatum->level);
    }
    kfree(datum);
    return 0;
}

static int cat_destroy(void *key, void *datum, void *p)
{
    kfree(key);
    kfree(datum);
    return 0;
}

static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
{
    common_destroy,
    cls_destroy,
    role_destroy,
    type_destroy,
    user_destroy,
    cond_destroy_bool,
    sens_destroy,
    cat_destroy,
};

static int filenametr_destroy(void *key, void *datum, void *p)
{
    struct filename_trans *ft = key;
    kfree(ft->name);
    kfree(key);
    kfree(datum);
    cond_resched();
    return 0;
}

static int range_tr_destroy(void *key, void *datum, void *p)
{
    struct mls_range *rt = datum;
    kfree(key);
    ebitmap_destroy(&rt->level[0].cat);
    ebitmap_destroy(&rt->level[1].cat);
    kfree(datum);
    cond_resched();
    return 0;
}

static void ocontext_destroy(struct ocontext *c, int i)
{
    if (!c)
        return;

    context_destroy(&c->context[0]);
    context_destroy(&c->context[1]);
    if (i == OCON_ISID || i == OCON_FS ||
        i == OCON_NETIF || i == OCON_FSUSE)
        kfree(c->u.name);
    kfree(c);
}

/*
 * Free any memory allocated by a policy database structure.
 */
void policydb_destroy(struct policydb *p)
{
    struct ocontext *c, *ctmp;
    struct genfs *g, *gtmp;
    int i;
    struct role_allow *ra, *lra = NULL;
    struct role_trans *tr, *ltr = NULL;

    for (i = 0; i < SYM_NUM; i++) {
        cond_resched();
        hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
        hashtab_destroy(p->symtab[i].table);
    }

    for (i = 0; i < SYM_NUM; i++) {
        if (p->sym_val_to_name[i])
            flex_array_free(p->sym_val_to_name[i]);
    }

    kfree(p->class_val_to_struct);
    kfree(p->role_val_to_struct);
    kfree(p->user_val_to_struct);
    if (p->type_val_to_struct_array)
        flex_array_free(p->type_val_to_struct_array);

    avtab_destroy(&p->te_avtab);

    for (i = 0; i < OCON_NUM; i++) {
        cond_resched();
        c = p->ocontexts[i];
        while (c) {
            ctmp = c;
            c = c->next;
            ocontext_destroy(ctmp, i);
        }
        p->ocontexts[i] = NULL;
    }

    g = p->genfs;
    while (g) {
        cond_resched();
        kfree(g->fstype);
        c = g->head;
        while (c) {
            ctmp = c;
            c = c->next;
            ocontext_destroy(ctmp, OCON_FSUSE);
        }
        gtmp = g;
        g = g->next;
        kfree(gtmp);
    }
    p->genfs = NULL;

    cond_policydb_destroy(p);

    for (tr = p->role_tr; tr; tr = tr->next) {
        cond_resched();
        kfree(ltr);
        ltr = tr;
    }
    kfree(ltr);

    for (ra = p->role_allow; ra; ra = ra->next) {
        cond_resched();
        kfree(lra);
        lra = ra;
    }
    kfree(lra);

    hashtab_map(p->filename_trans, filenametr_destroy, NULL);
    hashtab_destroy(p->filename_trans);

    hashtab_map(p->range_tr, range_tr_destroy, NULL);
    hashtab_destroy(p->range_tr);

    if (p->type_attr_map_array) {
        for (i = 0; i < p->p_types.nprim; i++) {
            struct ebitmap *e;

            e = flex_array_get(p->type_attr_map_array, i);
            if (!e)
                continue;
            ebitmap_destroy(e);
        }
        flex_array_free(p->type_attr_map_array);
    }

    ebitmap_destroy(&p->filename_trans_ttypes);
    ebitmap_destroy(&p->policycaps);
    ebitmap_destroy(&p->permissive_map);

    return;
}

/*
 * Load the initial SIDs specified in a policy database
 * structure into a SID table.
 */
int policydb_load_isids(struct policydb *p, struct sidtab *s)
{
    struct ocontext *head, *c;
    int rc;

    rc = sidtab_init(s);
    if (rc) {
        printk(KERN_ERR "SELinux:  out of memory on SID table init\n");
        goto out;
    }

    head = p->ocontexts[OCON_ISID];
    for (c = head; c; c = c->next) {
        rc = -EINVAL;
        if (!c->context[0].user) {
            printk(KERN_ERR "SELinux:  SID %s was never defined.\n",
                c->u.name);
            goto out;
        }

        rc = sidtab_insert(s, c->sid[0], &c->context[0]);
        if (rc) {
            printk(KERN_ERR "SELinux:  unable to load initial SID %s.\n",
                c->u.name);
            goto out;
        }
    }
    rc = 0;
out:
    return rc;
}

int policydb_class_isvalid(struct policydb *p, unsigned int class)
{
    if (!class || class > p->p_classes.nprim)
        return 0;
    return 1;
}

int policydb_role_isvalid(struct policydb *p, unsigned int role)
{
    if (!role || role > p->p_roles.nprim)
        return 0;
    return 1;
}

int policydb_type_isvalid(struct policydb *p, unsigned int type)
{
    if (!type || type > p->p_types.nprim)
        return 0;
    return 1;
}

/*
 * Return 1 if the fields in the security context
 * structure `c' are valid.  Return 0 otherwise.
 */
int policydb_context_isvalid(struct policydb *p, struct context *c)
{
    struct role_datum *role;
    struct user_datum *usrdatum;

    if (!c->role || c->role > p->p_roles.nprim)
        return 0;

    if (!c->user || c->user > p->p_users.nprim)
        return 0;

    if (!c->type || c->type > p->p_types.nprim)
        return 0;

    if (c->role != OBJECT_R_VAL) {
        /*
         * Role must be authorized for the type.
         */
        role = p->role_val_to_struct[c->role - 1];
        if (!ebitmap_get_bit(&role->types, c->type - 1))
            /* role may not be associated with type */
            return 0;

        /*
         * User must be authorized for the role.
         */
        usrdatum = p->user_val_to_struct[c->user - 1];
        if (!usrdatum)
            return 0;

        if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
            /* user may not be associated with role */
            return 0;
    }

    if (!mls_context_isvalid(p, c))
        return 0;

    return 1;
}

/*
 * Read a MLS range structure from a policydb binary
 * representation file.
 */
static int mls_read_range_helper(struct mls_range *r, void *fp)
{
    __le32 buf[2];
    u32 items;
    int rc;

    rc = next_entry(buf, fp, sizeof(u32));
    if (rc)
        goto out;

    rc = -EINVAL;
    items = le32_to_cpu(buf[0]);
    if (items > ARRAY_SIZE(buf)) {
        printk(KERN_ERR "SELinux: mls:  range overflow\n");
        goto out;
    }

    rc = next_entry(buf, fp, sizeof(u32) * items);
    if (rc) {
        printk(KERN_ERR "SELinux: mls:  truncated range\n");
        goto out;
    }

    r->level[0].sens = le32_to_cpu(buf[0]);
    if (items > 1)
        r->level[1].sens = le32_to_cpu(buf[1]);
    else
        r->level[1].sens = r->level[0].sens;

    rc = ebitmap_read(&r->level[0].cat, fp);
    if (rc) {
        printk(KERN_ERR "SELinux: mls:  error reading low categories\n");
        goto out;
    }
    if (items > 1) {
        rc = ebitmap_read(&r->level[1].cat, fp);
        if (rc) {
            printk(KERN_ERR "SELinux: mls:  error reading high categories\n");
            goto bad_high;
        }
    } else {
        rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
        if (rc) {
            printk(KERN_ERR "SELinux: mls:  out of memory\n");
            goto bad_high;
        }
    }

    return 0;
bad_high:
    ebitmap_destroy(&r->level[0].cat);
out:
    return rc;
}

/*
 * Read and validate a security context structure
 * from a policydb binary representation file.
 */
static int context_read_and_validate(struct context *c,
                     struct policydb *p,
                     void *fp)
{
    __le32 buf[3];
    int rc;

    rc = next_entry(buf, fp, sizeof buf);
    if (rc) {
        printk(KERN_ERR "SELinux: context truncated\n");
        goto out;
    }
    c->user = le32_to_cpu(buf[0]);
    c->role = le32_to_cpu(buf[1]);
    c->type = le32_to_cpu(buf[2]);
    if (p->policyvers >= POLICYDB_VERSION_MLS) {
        rc = mls_read_range_helper(&c->range, fp);
        if (rc) {
            printk(KERN_ERR "SELinux: error reading MLS range of context\n");
            goto out;
        }
    }

    rc = -EINVAL;
    if (!policydb_context_isvalid(p, c)) {
        printk(KERN_ERR "SELinux:  invalid security context\n");
        context_destroy(c);
        goto out;
    }
    rc = 0;
out:
    return rc;
}

/*
 * The following *_read functions are used to
 * read the symbol data from a policy database
 * binary representation file.
 */

static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
{
    char *key = NULL;
    struct perm_datum *perdatum;
    int rc;
    __le32 buf[2];
    u32 len;

    rc = -ENOMEM;
    perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
    if (!perdatum)
        goto bad;

    rc = next_entry(buf, fp, sizeof buf);
    if (rc)
        goto bad;

    len = le32_to_cpu(buf[0]);
    perdatum->value = le32_to_cpu(buf[1]);

    rc = -ENOMEM;
    key = kmalloc(len + 1, GFP_KERNEL);
    if (!key)
        goto bad;

    rc = next_entry(key, fp, len);
    if (rc)
        goto bad;
    key[len] = '\0';

    rc = hashtab_insert(h, key, perdatum);
    if (rc)
        goto bad;

    return 0;
bad:
    perm_destroy(key, perdatum, NULL);
    return rc;
}

static int common_read(struct policydb *p, struct hashtab *h, void *fp)
{
    char *key = NULL;
    struct common_datum *comdatum;
    __le32 buf[4];
    u32 len, nel;
    int i, rc;

    rc = -ENOMEM;
    comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
    if (!comdatum)
        goto bad;

    rc = next_entry(buf, fp, sizeof buf);
    if (rc)
        goto bad;

    len = le32_to_cpu(buf[0]);
    comdatum->value = le32_to_cpu(buf[1]);

    rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
    if (rc)
        goto bad;
    comdatum->permissions.nprim = le32_to_cpu(buf[2]);
    nel = le32_to_cpu(buf[3]);

    rc = -ENOMEM;
    key = kmalloc(len + 1, GFP_KERNEL);
    if (!key)
        goto bad;

    rc = next_entry(key, fp, len);
    if (rc)
        goto bad;
    key[len] = '\0';

    for (i = 0; i < nel; i++) {
        rc = perm_read(p, comdatum->permissions.table, fp);
        if (rc)
            goto bad;
    }

    rc = hashtab_insert(h, key, comdatum);
    if (rc)
        goto bad;
    return 0;
bad:
    common_destroy(key, comdatum, NULL);
    return rc;
}

static int read_cons_helper(struct constraint_node **nodep, int ncons,
                int allowxtarget, void *fp)
{
    struct constraint_node *c, *lc;
    struct constraint_expr *e, *le;
    __le32 buf[3];
    u32 nexpr;
    int rc, i, j, depth;

    lc = NULL;
    for (i = 0; i < ncons; i++) {
        c = kzalloc(sizeof(*c), GFP_KERNEL);
        if (!c)
            return -ENOMEM;

        if (lc)
            lc->next = c;
        else
            *nodep = c;

        rc = next_entry(buf, fp, (sizeof(u32) * 2));
        if (rc)
            return rc;
        c->permissions = le32_to_cpu(buf[0]);
        nexpr = le32_to_cpu(buf[1]);
        le = NULL;
        depth = -1;
        for (j = 0; j < nexpr; j++) {
            e = kzalloc(sizeof(*e), GFP_KERNEL);
            if (!e)
                return -ENOMEM;

            if (le)
                le->next = e;
            else
                c->expr = e;

            rc = next_entry(buf, fp, (sizeof(u32) * 3));
            if (rc)
                return rc;
            e->expr_type = le32_to_cpu(buf[0]);
            e->attr = le32_to_cpu(buf[1]);
            e->op = le32_to_cpu(buf[2]);

            switch (e->expr_type) {
            case CEXPR_NOT:
                if (depth < 0)
                    return -EINVAL;
                break;
            case CEXPR_AND:
            case CEXPR_OR:
                if (depth < 1)
                    return -EINVAL;
                depth--;
                break;
            case CEXPR_ATTR:
                if (depth == (CEXPR_MAXDEPTH - 1))
                    return -EINVAL;
                depth++;
                break;
            case CEXPR_NAMES:
                if (!allowxtarget && (e->attr & CEXPR_XTARGET))
                    return -EINVAL;
                if (depth == (CEXPR_MAXDEPTH - 1))
                    return -EINVAL;
                depth++;
                rc = ebitmap_read(&e->names, fp);
                if (rc)
                    return rc;
                break;
            default:
                return -EINVAL;
            }
            le = e;
        }
        if (depth != 0)
            return -EINVAL;
        lc = c;
    }

    return 0;
}

static int class_read(struct policydb *p, struct hashtab *h, void *fp)
{
    char *key = NULL;
    struct class_datum *cladatum;
    __le32 buf[6];
    u32 len, len2, ncons, nel;
    int i, rc;

    rc = -ENOMEM;
    cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
    if (!cladatum)
        goto bad;

    rc = next_entry(buf, fp, sizeof(u32)*6);
    if (rc)
        goto bad;

    len = le32_to_cpu(buf[0]);
    len2 = le32_to_cpu(buf[1]);
    cladatum->value = le32_to_cpu(buf[2]);

    rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
    if (rc)
        goto bad;
    cladatum->permissions.nprim = le32_to_cpu(buf[3]);
    nel = le32_to_cpu(buf[4]);

    ncons = le32_to_cpu(buf[5]);

    rc = -ENOMEM;
    key = kmalloc(len + 1, GFP_KERNEL);
    if (!key)
        goto bad;

    rc = next_entry(key, fp, len);
    if (rc)
        goto bad;
    key[len] = '\0';

    if (len2) {
        rc = -ENOMEM;
        cladatum->comkey = kmalloc(len2 + 1, GFP_KERNEL);
        if (!cladatum->comkey)
            goto bad;
        rc = next_entry(cladatum->comkey, fp, len2);
        if (rc)
            goto bad;
        cladatum->comkey[len2] = '\0';

        rc = -EINVAL;
        cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey);
        if (!cladatum->comdatum) {
            printk(KERN_ERR "SELinux:  unknown common %s\n", cladatum->comkey);
            goto bad;
        }
    }
    for (i = 0; i < nel; i++) {
        rc = perm_read(p, cladatum->permissions.table, fp);
        if (rc)
            goto bad;
    }

    rc = read_cons_helper(&cladatum->constraints, ncons, 0, fp);
    if (rc)
        goto bad;

    if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
        /* grab the validatetrans rules */
        rc = next_entry(buf, fp, sizeof(u32));
        if (rc)
            goto bad;
        ncons = le32_to_cpu(buf[0]);
        rc = read_cons_helper(&cladatum->validatetrans, ncons, 1, fp);
        if (rc)
            goto bad;
    }

    if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
        rc = next_entry(buf, fp, sizeof(u32) * 3);
        if (rc)
            goto bad;

        cladatum->default_user = le32_to_cpu(buf[0]);
        cladatum->default_role = le32_to_cpu(buf[1]);
        cladatum->default_range = le32_to_cpu(buf[2]);
    }

    if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
        rc = next_entry(buf, fp, sizeof(u32) * 1);
        if (rc)
            goto bad;
        cladatum->default_type = le32_to_cpu(buf[0]);
    }

    rc = hashtab_insert(h, key, cladatum);
    if (rc)
        goto bad;

    return 0;
bad:
    cls_destroy(key, cladatum, NULL);
    return rc;
}

static int role_read(struct policydb *p, struct hashtab *h, void *fp)
{
    char *key = NULL;
    struct role_datum *role;
    int rc, to_read = 2;
    __le32 buf[3];
    u32 len;

    rc = -ENOMEM;
    role = kzalloc(sizeof(*role), GFP_KERNEL);
    if (!role)
        goto bad;

    if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
        to_read = 3;

    rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
    if (rc)
        goto bad;

    len = le32_to_cpu(buf[0]);
    role->value = le32_to_cpu(buf[1]);
    if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
        role->bounds = le32_to_cpu(buf[2]);

    rc = -ENOMEM;
    key = kmalloc(len + 1, GFP_KERNEL);
    if (!key)
        goto bad;

    rc = next_entry(key, fp, len);
    if (rc)
        goto bad;
    key[len] = '\0';

    rc = ebitmap_read(&role->dominates, fp);
    if (rc)
        goto bad;

    rc = ebitmap_read(&role->types, fp);
    if (rc)
        goto bad;

    if (strcmp(key, OBJECT_R) == 0) {
        rc = -EINVAL;
        if (role->value != OBJECT_R_VAL) {
            printk(KERN_ERR "SELinux: Role %s has wrong value %d\n",
                   OBJECT_R, role->value);
            goto bad;
        }
        rc = 0;
        goto bad;
    }

    rc = hashtab_insert(h, key, role);
    if (rc)
        goto bad;
    return 0;
bad:
    role_destroy(key, role, NULL);
    return rc;
}

static int type_read(struct policydb *p, struct hashtab *h, void *fp)
{
    char *key = NULL;
    struct type_datum *typdatum;
    int rc, to_read = 3;
    __le32 buf[4];
    u32 len;

    rc = -ENOMEM;
    typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
    if (!typdatum)
        goto bad;

    if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
        to_read = 4;

    rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
    if (rc)
        goto bad;

    len = le32_to_cpu(buf[0]);
    typdatum->value = le32_to_cpu(buf[1]);
    if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
        u32 prop = le32_to_cpu(buf[2]);

        if (prop & TYPEDATUM_PROPERTY_PRIMARY)
            typdatum->primary = 1;
        if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
            typdatum->attribute = 1;

        typdatum->bounds = le32_to_cpu(buf[3]);
    } else {
        typdatum->primary = le32_to_cpu(buf[2]);
    }

    rc = -ENOMEM;
    key = kmalloc(len + 1, GFP_KERNEL);
    if (!key)
        goto bad;
    rc = next_entry(key, fp, len);
    if (rc)
        goto bad;
    key[len] = '\0';

    rc = hashtab_insert(h, key, typdatum);
    if (rc)
        goto bad;
    return 0;
bad:
    type_destroy(key, typdatum, NULL);
    return rc;
}


/*
 * Read a MLS level structure from a policydb binary
 * representation file.
 */
static int mls_read_level(struct mls_level *lp, void *fp)
{
    __le32 buf[1];
    int rc;

    memset(lp, 0, sizeof(*lp));

    rc = next_entry(buf, fp, sizeof buf);
    if (rc) {
        printk(KERN_ERR "SELinux: mls: truncated level\n");
        return rc;
    }
    lp->sens = le32_to_cpu(buf[0]);

    rc = ebitmap_read(&lp->cat, fp);
    if (rc) {
        printk(KERN_ERR "SELinux: mls:  error reading level categories\n");
        return rc;
    }
    return 0;
}

static int user_read(struct policydb *p, struct hashtab *h, void *fp)
{
    char *key = NULL;
    struct user_datum *usrdatum;
    int rc, to_read = 2;
    __le32 buf[3];
    u32 len;

    rc = -ENOMEM;
    usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
    if (!usrdatum)
        goto bad;

    if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
        to_read = 3;

    rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
    if (rc)
        goto bad;

    len = le32_to_cpu(buf[0]);
    usrdatum->value = le32_to_cpu(buf[1]);
    if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
        usrdatum->bounds = le32_to_cpu(buf[2]);

    rc = -ENOMEM;
    key = kmalloc(len + 1, GFP_KERNEL);
    if (!key)
        goto bad;
    rc = next_entry(key, fp, len);
    if (rc)
        goto bad;
    key[len] = '\0';

    rc = ebitmap_read(&usrdatum->roles, fp);
    if (rc)
        goto bad;

    if (p->policyvers >= POLICYDB_VERSION_MLS) {
        rc = mls_read_range_helper(&usrdatum->range, fp);
        if (rc)
            goto bad;
        rc = mls_read_level(&usrdatum->dfltlevel, fp);
        if (rc)
            goto bad;
    }

    rc = hashtab_insert(h, key, usrdatum);
    if (rc)
        goto bad;
    return 0;
bad:
    user_destroy(key, usrdatum, NULL);
    return rc;
}

static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
{
    char *key = NULL;
    struct level_datum *levdatum;
    int rc;
    __le32 buf[2];
    u32 len;

    rc = -ENOMEM;
    levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
    if (!levdatum)
        goto bad;

    rc = next_entry(buf, fp, sizeof buf);
    if (rc)
        goto bad;

    len = le32_to_cpu(buf[0]);
    levdatum->isalias = le32_to_cpu(buf[1]);

    rc = -ENOMEM;
    key = kmalloc(len + 1, GFP_ATOMIC);
    if (!key)
        goto bad;
    rc = next_entry(key, fp, len);
    if (rc)
        goto bad;
    key[len] = '\0';

    rc = -ENOMEM;
    levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC);
    if (!levdatum->level)
        goto bad;

    rc = mls_read_level(levdatum->level, fp);
    if (rc)
        goto bad;

    rc = hashtab_insert(h, key, levdatum);
    if (rc)
        goto bad;
    return 0;
bad:
    sens_destroy(key, levdatum, NULL);
    return rc;
}

static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
{
    char *key = NULL;
    struct cat_datum *catdatum;
    int rc;
    __le32 buf[3];
    u32 len;

    rc = -ENOMEM;
    catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
    if (!catdatum)
        goto bad;

    rc = next_entry(buf, fp, sizeof buf);
    if (rc)
        goto bad;

    len = le32_to_cpu(buf[0]);
    catdatum->value = le32_to_cpu(buf[1]);
    catdatum->isalias = le32_to_cpu(buf[2]);

    rc = -ENOMEM;
    key = kmalloc(len + 1, GFP_ATOMIC);
    if (!key)
        goto bad;
    rc = next_entry(key, fp, len);
    if (rc)
        goto bad;
    key[len] = '\0';

    rc = hashtab_insert(h, key, catdatum);
    if (rc)
        goto bad;
    return 0;
bad:
    cat_destroy(key, catdatum, NULL);
    return rc;
}

static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
{
    common_read,
    class_read,
    role_read,
    type_read,
    user_read,
    cond_read_bool,
    sens_read,
    cat_read,
};

static int user_bounds_sanity_check(void *key, void *datum, void *datap)
{
    struct user_datum *upper, *user;
    struct policydb *p = datap;
    int depth = 0;

    upper = user = datum;
    while (upper->bounds) {
        struct ebitmap_node *node;
        unsigned long bit;

        if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
            printk(KERN_ERR "SELinux: user %s: "
                   "too deep or looped boundary",
                   (char *) key);
            return -EINVAL;
        }

        upper = p->user_val_to_struct[upper->bounds - 1];
        ebitmap_for_each_positive_bit(&user->roles, node, bit) {
            if (ebitmap_get_bit(&upper->roles, bit))
                continue;

            printk(KERN_ERR
                   "SELinux: boundary violated policy: "
                   "user=%s role=%s bounds=%s\n",
                   sym_name(p, SYM_USERS, user->value - 1),
                   sym_name(p, SYM_ROLES, bit),
                   sym_name(p, SYM_USERS, upper->value - 1));

            return -EINVAL;
        }
    }

    return 0;
}

static int role_bounds_sanity_check(void *key, void *datum, void *datap)
{
    struct role_datum *upper, *role;
    struct policydb *p = datap;
    int depth = 0;

    upper = role = datum;
    while (upper->bounds) {
        struct ebitmap_node *node;
        unsigned long bit;

        if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
            printk(KERN_ERR "SELinux: role %s: "
                   "too deep or looped bounds\n",
                   (char *) key);
            return -EINVAL;
        }

        upper = p->role_val_to_struct[upper->bounds - 1];
        ebitmap_for_each_positive_bit(&role->types, node, bit) {
            if (ebitmap_get_bit(&upper->types, bit))
                continue;

            printk(KERN_ERR
                   "SELinux: boundary violated policy: "
                   "role=%s type=%s bounds=%s\n",
                   sym_name(p, SYM_ROLES, role->value - 1),
                   sym_name(p, SYM_TYPES, bit),
                   sym_name(p, SYM_ROLES, upper->value - 1));

            return -EINVAL;
        }
    }

    return 0;
}

static int type_bounds_sanity_check(void *key, void *datum, void *datap)
{
    struct type_datum *upper;
    struct policydb *p = datap;
    int depth = 0;

    upper = datum;
    while (upper->bounds) {
        if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
            printk(KERN_ERR "SELinux: type %s: "
                   "too deep or looped boundary\n",
                   (char *) key);
            return -EINVAL;
        }

        upper = flex_array_get_ptr(p->type_val_to_struct_array,
                       upper->bounds - 1);
        BUG_ON(!upper);

        if (upper->attribute) {
            printk(KERN_ERR "SELinux: type %s: "
                   "bounded by attribute %s",
                   (char *) key,
                   sym_name(p, SYM_TYPES, upper->value - 1));
            return -EINVAL;
        }
    }

    return 0;
}

static int policydb_bounds_sanity_check(struct policydb *p)
{
    int rc;

    if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
        return 0;

    rc = hashtab_map(p->p_users.table,
             user_bounds_sanity_check, p);
    if (rc)
        return rc;

    rc = hashtab_map(p->p_roles.table,
             role_bounds_sanity_check, p);
    if (rc)
        return rc;

    rc = hashtab_map(p->p_types.table,
             type_bounds_sanity_check, p);
    if (rc)
        return rc;

    return 0;
}

u16 string_to_security_class(struct policydb *p, const char *name)
{
    struct class_datum *cladatum;

    cladatum = hashtab_search(p->p_classes.table, name);
    if (!cladatum)
        return 0;

    return cladatum->value;
}

u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
{
    struct class_datum *cladatum;
    struct perm_datum *perdatum = NULL;
    struct common_datum *comdatum;

    if (!tclass || tclass > p->p_classes.nprim)
        return 0;

    cladatum = p->class_val_to_struct[tclass-1];
    comdatum = cladatum->comdatum;
    if (comdatum)
        perdatum = hashtab_search(comdatum->permissions.table,
                      name);
    if (!perdatum)
        perdatum = hashtab_search(cladatum->permissions.table,
                      name);
    if (!perdatum)
        return 0;

    return 1U << (perdatum->value-1);
}

static int range_read(struct policydb *p, void *fp)
{
    struct range_trans *rt = NULL;
    struct mls_range *r = NULL;
    int i, rc;
    __le32 buf[2];
    u32 nel;

    if (p->policyvers < POLICYDB_VERSION_MLS)
        return 0;

    rc = next_entry(buf, fp, sizeof(u32));
    if (rc)
        goto out;

    nel = le32_to_cpu(buf[0]);
    for (i = 0; i < nel; i++) {
        rc = -ENOMEM;
        rt = kzalloc(sizeof(*rt), GFP_KERNEL);
        if (!rt)
            goto out;

        rc = next_entry(buf, fp, (sizeof(u32) * 2));
        if (rc)
            goto out;

        rt->source_type = le32_to_cpu(buf[0]);
        rt->target_type = le32_to_cpu(buf[1]);
        if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
            rc = next_entry(buf, fp, sizeof(u32));
            if (rc)
                goto out;
            rt->target_class = le32_to_cpu(buf[0]);
        } else
            rt->target_class = p->process_class;

        rc = -EINVAL;
        if (!policydb_type_isvalid(p, rt->source_type) ||
            !policydb_type_isvalid(p, rt->target_type) ||
            !policydb_class_isvalid(p, rt->target_class))
            goto out;

        rc = -ENOMEM;
        r = kzalloc(sizeof(*r), GFP_KERNEL);
        if (!r)
            goto out;

        rc = mls_read_range_helper(r, fp);
        if (rc)
            goto out;

        rc = -EINVAL;
        if (!mls_range_isvalid(p, r)) {
            printk(KERN_WARNING "SELinux:  rangetrans:  invalid range\n");
            goto out;
        }

        rc = hashtab_insert(p->range_tr, rt, r);
        if (rc)
            goto out;

        rt = NULL;
        r = NULL;
    }
    hash_eval(p->range_tr, "rangetr");
    rc = 0;
out:
    kfree(rt);
    kfree(r);
    return rc;
}

static int filename_trans_read(struct policydb *p, void *fp)
{
    struct filename_trans *ft;
    struct filename_trans_datum *otype;
    char *name;
    u32 nel, len;
    __le32 buf[4];
    int rc, i;

    if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
        return 0;

    rc = next_entry(buf, fp, sizeof(u32));
    if (rc)
        return rc;
    nel = le32_to_cpu(buf[0]);

    for (i = 0; i < nel; i++) {
        ft = NULL;
        otype = NULL;
        name = NULL;

        rc = -ENOMEM;
        ft = kzalloc(sizeof(*ft), GFP_KERNEL);
        if (!ft)
            goto out;

        rc = -ENOMEM;
        otype = kmalloc(sizeof(*otype), GFP_KERNEL);
        if (!otype)
            goto out;

        /* length of the path component string */
        rc = next_entry(buf, fp, sizeof(u32));
        if (rc)
            goto out;
        len = le32_to_cpu(buf[0]);

        rc = -ENOMEM;
        name = kmalloc(len + 1, GFP_KERNEL);
        if (!name)
            goto out;

        ft->name = name;

        /* path component string */
        rc = next_entry(name, fp, len);
        if (rc)
            goto out;
        name[len] = 0;

        rc = next_entry(buf, fp, sizeof(u32) * 4);
        if (rc)
            goto out;

        ft->stype = le32_to_cpu(buf[0]);
        ft->ttype = le32_to_cpu(buf[1]);
        ft->tclass = le32_to_cpu(buf[2]);

        otype->otype = le32_to_cpu(buf[3]);

        rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1);
        if (rc)
            goto out;

        hashtab_insert(p->filename_trans, ft, otype);
    }
    hash_eval(p->filename_trans, "filenametr");
    return 0;
out:
    kfree(ft);
    kfree(name);
    kfree(otype);

    return rc;
}

static int genfs_read(struct policydb *p, void *fp)
{
    int i, j, rc;
    u32 nel, nel2, len, len2;
    __le32 buf[1];
    struct ocontext *l, *c;
    struct ocontext *newc = NULL;
    struct genfs *genfs_p, *genfs;
    struct genfs *newgenfs = NULL;

    rc = next_entry(buf, fp, sizeof(u32));
    if (rc)
        goto out;
    nel = le32_to_cpu(buf[0]);

    for (i = 0; i < nel; i++) {
        rc = next_entry(buf, fp, sizeof(u32));
        if (rc)
            goto out;
        len = le32_to_cpu(buf[0]);

        rc = -ENOMEM;
        newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
        if (!newgenfs)
            goto out;

        rc = -ENOMEM;
        newgenfs->fstype = kmalloc(len + 1, GFP_KERNEL);
        if (!newgenfs->fstype)
            goto out;

        rc = next_entry(newgenfs->fstype, fp, len);
        if (rc)
            goto out;

        newgenfs->fstype[len] = 0;

        for (genfs_p = NULL, genfs = p->genfs; genfs;
             genfs_p = genfs, genfs = genfs->next) {
            rc = -EINVAL;
            if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
                printk(KERN_ERR "SELinux:  dup genfs fstype %s\n",
                       newgenfs->fstype);
                goto out;
            }
            if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
                break;
        }
        newgenfs->next = genfs;
        if (genfs_p)
            genfs_p->next = newgenfs;
        else
            p->genfs = newgenfs;
        genfs = newgenfs;
        newgenfs = NULL;

        rc = next_entry(buf, fp, sizeof(u32));
        if (rc)
            goto out;

        nel2 = le32_to_cpu(buf[0]);
        for (j = 0; j < nel2; j++) {
            rc = next_entry(buf, fp, sizeof(u32));
            if (rc)
                goto out;
            len = le32_to_cpu(buf[0]);

            rc = -ENOMEM;
            newc = kzalloc(sizeof(*newc), GFP_KERNEL);
            if (!newc)
                goto out;

            rc = -ENOMEM;
            newc->u.name = kmalloc(len + 1, GFP_KERNEL);
            if (!newc->u.name)
                goto out;

            rc = next_entry(newc->u.name, fp, len);
            if (rc)
                goto out;
            newc->u.name[len] = 0;

            rc = next_entry(buf, fp, sizeof(u32));
            if (rc)
                goto out;

            newc->v.sclass = le32_to_cpu(buf[0]);
            rc = context_read_and_validate(&newc->context[0], p, fp);
            if (rc)
                goto out;

            for (l = NULL, c = genfs->head; c;
                 l = c, c = c->next) {
                rc = -EINVAL;
                if (!strcmp(newc->u.name, c->u.name) &&
                    (!c->v.sclass || !newc->v.sclass ||
                     newc->v.sclass == c->v.sclass)) {
                    printk(KERN_ERR "SELinux:  dup genfs entry (%s,%s)\n",
                           genfs->fstype, c->u.name);
                    goto out;
                }
                len = strlen(newc->u.name);
                len2 = strlen(c->u.name);
                if (len > len2)
                    break;
            }

            newc->next = c;
            if (l)
                l->next = newc;
            else
                genfs->head = newc;
            newc = NULL;
        }
    }
    rc = 0;
out:
    if (newgenfs)
        kfree(newgenfs->fstype);
    kfree(newgenfs);
    ocontext_destroy(newc, OCON_FSUSE);

    return rc;
}

static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
             void *fp)
{
    int i, j, rc;
    u32 nel, len;
    __le32 buf[3];
    struct ocontext *l, *c;
    u32 nodebuf[8];

    for (i = 0; i < info->ocon_num; i++) {
        rc = next_entry(buf, fp, sizeof(u32));
        if (rc)
            goto out;
        nel = le32_to_cpu(buf[0]);

        l = NULL;
        for (j = 0; j < nel; j++) {
            rc = -ENOMEM;
            c = kzalloc(sizeof(*c), GFP_KERNEL);
            if (!c)
                goto out;
            if (l)
                l->next = c;
            else
                p->ocontexts[i] = c;
            l = c;

            switch (i) {
            case OCON_ISID:
                rc = next_entry(buf, fp, sizeof(u32));
                if (rc)
                    goto out;

                c->sid[0] = le32_to_cpu(buf[0]);
                rc = context_read_and_validate(&c->context[0], p, fp);
                if (rc)
                    goto out;
                break;
            case OCON_FS:
            case OCON_NETIF:
                rc = next_entry(buf, fp, sizeof(u32));
                if (rc)
                    goto out;
                len = le32_to_cpu(buf[0]);

                rc = -ENOMEM;
                c->u.name = kmalloc(len + 1, GFP_KERNEL);
                if (!c->u.name)
                    goto out;

                rc = next_entry(c->u.name, fp, len);
                if (rc)
                    goto out;

                c->u.name[len] = 0;
                rc = context_read_and_validate(&c->context[0], p, fp);
                if (rc)
                    goto out;
                rc = context_read_and_validate(&c->context[1], p, fp);
                if (rc)
                    goto out;
                break;
            case OCON_PORT:
                rc = next_entry(buf, fp, sizeof(u32)*3);
                if (rc)
                    goto out;
                c->u.port.protocol = le32_to_cpu(buf[0]);
                c->u.port.low_port = le32_to_cpu(buf[1]);
                c->u.port.high_port = le32_to_cpu(buf[2]);
                rc = context_read_and_validate(&c->context[0], p, fp);
                if (rc)
                    goto out;
                break;
            case OCON_NODE:
                rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
                if (rc)
                    goto out;
                c->u.node.addr = nodebuf[0]; /* network order */
                c->u.node.mask = nodebuf[1]; /* network order */
                rc = context_read_and_validate(&c->context[0], p, fp);
                if (rc)
                    goto out;
                break;
            case OCON_FSUSE:
                rc = next_entry(buf, fp, sizeof(u32)*2);
                if (rc)
                    goto out;

                rc = -EINVAL;
                c->v.behavior = le32_to_cpu(buf[0]);
                if (c->v.behavior > SECURITY_FS_USE_NONE)
                    goto out;

                rc = -ENOMEM;
                len = le32_to_cpu(buf[1]);
                c->u.name = kmalloc(len + 1, GFP_KERNEL);
                if (!c->u.name)
                    goto out;

                rc = next_entry(c->u.name, fp, len);
                if (rc)
                    goto out;
                c->u.name[len] = 0;
                rc = context_read_and_validate(&c->context[0], p, fp);
                if (rc)
                    goto out;
                break;
            case OCON_NODE6: {
                int k;

                rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
                if (rc)
                    goto out;
                for (k = 0; k < 4; k++)
                    c->u.node6.addr[k] = nodebuf[k];
                for (k = 0; k < 4; k++)
                    c->u.node6.mask[k] = nodebuf[k+4];
                rc = context_read_and_validate(&c->context[0], p, fp);
                if (rc)
                    goto out;
                break;
            }
            }
        }
    }
    rc = 0;
out:
    return rc;
}

/*
 * Read the configuration data from a policy database binary
 * representation file into a policy database structure.
 */
int policydb_read(struct policydb *p, void *fp)
{
    struct role_allow *ra, *lra;
    struct role_trans *tr, *ltr;
    int i, j, rc;
    __le32 buf[4];
    u32 len, nprim, nel;

    char *policydb_str;
    struct policydb_compat_info *info;

    rc = policydb_init(p);
    if (rc)
        return rc;

    /* Read the magic number and string length. */
    rc = next_entry(buf, fp, sizeof(u32) * 2);
    if (rc)
        goto bad;

    rc = -EINVAL;
    if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
        printk(KERN_ERR "SELinux:  policydb magic number 0x%x does "
               "not match expected magic number 0x%x\n",
               le32_to_cpu(buf[0]), POLICYDB_MAGIC);
        goto bad;
    }

    rc = -EINVAL;
    len = le32_to_cpu(buf[1]);
    if (len != strlen(POLICYDB_STRING)) {
        printk(KERN_ERR "SELinux:  policydb string length %d does not "
               "match expected length %Zu\n",
               len, strlen(POLICYDB_STRING));
        goto bad;
    }

    rc = -ENOMEM;
    policydb_str = kmalloc(len + 1, GFP_KERNEL);
    if (!policydb_str) {
        printk(KERN_ERR "SELinux:  unable to allocate memory for policydb "
               "string of length %d\n", len);
        goto bad;
    }

    rc = next_entry(policydb_str, fp, len);
    if (rc) {
        printk(KERN_ERR "SELinux:  truncated policydb string identifier\n");
        kfree(policydb_str);
        goto bad;
    }

    rc = -EINVAL;
    policydb_str[len] = '\0';
    if (strcmp(policydb_str, POLICYDB_STRING)) {
        printk(KERN_ERR "SELinux:  policydb string %s does not match "
               "my string %s\n", policydb_str, POLICYDB_STRING);
        kfree(policydb_str);
        goto bad;
    }
    /* Done with policydb_str. */
    kfree(policydb_str);
    policydb_str = NULL;

    /* Read the version and table sizes. */
    rc = next_entry(buf, fp, sizeof(u32)*4);
    if (rc)
        goto bad;

    rc = -EINVAL;
    p->policyvers = le32_to_cpu(buf[0]);
    if (p->policyvers < POLICYDB_VERSION_MIN ||
        p->policyvers > POLICYDB_VERSION_MAX) {
        printk(KERN_ERR "SELinux:  policydb version %d does not match "
               "my version range %d-%d\n",
               le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
        goto bad;
    }

    if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
        p->mls_enabled = 1;

        rc = -EINVAL;
        if (p->policyvers < POLICYDB_VERSION_MLS) {
            printk(KERN_ERR "SELinux: security policydb version %d "
                "(MLS) not backwards compatible\n",
                p->policyvers);
            goto bad;
        }
    }
    p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
    p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);

    if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
        rc = ebitmap_read(&p->policycaps, fp);
        if (rc)
            goto bad;
    }

    if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
        rc = ebitmap_read(&p->permissive_map, fp);
        if (rc)
            goto bad;
    }

    rc = -EINVAL;
    info = policydb_lookup_compat(p->policyvers);
    if (!info) {
        printk(KERN_ERR "SELinux:  unable to find policy compat info "
               "for version %d\n", p->policyvers);
        goto bad;
    }

    rc = -EINVAL;
    if (le32_to_cpu(buf[2]) != info->sym_num ||
        le32_to_cpu(buf[3]) != info->ocon_num) {
        printk(KERN_ERR "SELinux:  policydb table sizes (%d,%d) do "
               "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
            le32_to_cpu(buf[3]),
               info->sym_num, info->ocon_num);
        goto bad;
    }

    for (i = 0; i < info->sym_num; i++) {
        rc = next_entry(buf, fp, sizeof(u32)*2);
        if (rc)
            goto bad;
        nprim = le32_to_cpu(buf[0]);
        nel = le32_to_cpu(buf[1]);
        for (j = 0; j < nel; j++) {
            rc = read_f[i](p, p->symtab[i].table, fp);
            if (rc)
                goto bad;
        }

        p->symtab[i].nprim = nprim;
    }

    rc = -EINVAL;
    p->process_class = string_to_security_class(p, "process");
    if (!p->process_class)
        goto bad;

    rc = avtab_read(&p->te_avtab, fp, p);
    if (rc)
        goto bad;

    if (p->policyvers >= POLICYDB_VERSION_BOOL) {
        rc = cond_read_list(p, fp);
        if (rc)
            goto bad;
    }

    rc = next_entry(buf, fp, sizeof(u32));
    if (rc)
        goto bad;
    nel = le32_to_cpu(buf[0]);
    ltr = NULL;
    for (i = 0; i < nel; i++) {
        rc = -ENOMEM;
        tr = kzalloc(sizeof(*tr), GFP_KERNEL);
        if (!tr)
            goto bad;
        if (ltr)
            ltr->next = tr;
        else
            p->role_tr = tr;
        rc = next_entry(buf, fp, sizeof(u32)*3);
        if (rc)
            goto bad;

        rc = -EINVAL;
        tr->role = le32_to_cpu(buf[0]);
        tr->type = le32_to_cpu(buf[1]);
        tr->new_role = le32_to_cpu(buf[2]);
        if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
            rc = next_entry(buf, fp, sizeof(u32));
            if (rc)
                goto bad;
            tr->tclass = le32_to_cpu(buf[0]);
        } else
            tr->tclass = p->process_class;

        if (!policydb_role_isvalid(p, tr->role) ||
            !policydb_type_isvalid(p, tr->type) ||
            !policydb_class_isvalid(p, tr->tclass) ||
            !policydb_role_isvalid(p, tr->new_role))
            goto bad;
        ltr = tr;
    }

    rc = next_entry(buf, fp, sizeof(u32));
    if (rc)
        goto bad;
    nel = le32_to_cpu(buf[0]);
    lra = NULL;
    for (i = 0; i < nel; i++) {
        rc = -ENOMEM;
        ra = kzalloc(sizeof(*ra), GFP_KERNEL);
        if (!ra)
            goto bad;
        if (lra)
            lra->next = ra;
        else
            p->role_allow = ra;
        rc = next_entry(buf, fp, sizeof(u32)*2);
        if (rc)
            goto bad;

        rc = -EINVAL;
        ra->role = le32_to_cpu(buf[0]);
        ra->new_role = le32_to_cpu(buf[1]);
        if (!policydb_role_isvalid(p, ra->role) ||
            !policydb_role_isvalid(p, ra->new_role))
            goto bad;
        lra = ra;
    }

    rc = filename_trans_read(p, fp);
    if (rc)
        goto bad;

    rc = policydb_index(p);
    if (rc)
        goto bad;

    rc = -EINVAL;
    p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition");
    p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition");
    if (!p->process_trans_perms)
        goto bad;

    rc = ocontext_read(p, info, fp);
    if (rc)
        goto bad;

    rc = genfs_read(p, fp);
    if (rc)
        goto bad;

    rc = range_read(p, fp);
    if (rc)
        goto bad;

    rc = -ENOMEM;
    p->type_attr_map_array = flex_array_alloc(sizeof(struct ebitmap),
                          p->p_types.nprim,
                          GFP_KERNEL | __GFP_ZERO);
    if (!p->type_attr_map_array)
        goto bad;

    /* preallocate so we don't have to worry about the put ever failing */
    rc = flex_array_prealloc(p->type_attr_map_array, 0, p->p_types.nprim,
                 GFP_KERNEL | __GFP_ZERO);
    if (rc)
        goto bad;

    for (i = 0; i < p->p_types.nprim; i++) {
        struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);

        BUG_ON(!e);
        ebitmap_init(e);
        if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
            rc = ebitmap_read(e, fp);
            if (rc)
                goto bad;
        }
        /* add the type itself as the degenerate case */
        rc = ebitmap_set_bit(e, i, 1);
        if (rc)
            goto bad;
    }

    rc = policydb_bounds_sanity_check(p);
    if (rc)
        goto bad;

    rc = 0;
out:
    return rc;
bad:
    policydb_destroy(p);
    goto out;
}

/*
 * Write a MLS level structure to a policydb binary
 * representation file.
 */
static int mls_write_level(struct mls_level *l, void *fp)
{
    __le32 buf[1];
    int rc;

    buf[0] = cpu_to_le32(l->sens);
    rc = put_entry(buf, sizeof(u32), 1, fp);
    if (rc)
        return rc;

    rc = ebitmap_write(&l->cat, fp);
    if (rc)
        return rc;

    return 0;
}

/*
 * Write a MLS range structure to a policydb binary
 * representation file.
 */
static int mls_write_range_helper(struct mls_range *r, void *fp)
{
    __le32 buf[3];
    size_t items;
    int rc, eq;

    eq = mls_level_eq(&r->level[1], &r->level[0]);

    if (eq)
        items = 2;
    else
        items = 3;
    buf[0] = cpu_to_le32(items-1);
    buf[1] = cpu_to_le32(r->level[0].sens);
    if (!eq)
        buf[2] = cpu_to_le32(r->level[1].sens);

    BUG_ON(items > (sizeof(buf)/sizeof(buf[0])));

    rc = put_entry(buf, sizeof(u32), items, fp);
    if (rc)
        return rc;

    rc = ebitmap_write(&r->level[0].cat, fp);
    if (rc)
        return rc;
    if (!eq) {
        rc = ebitmap_write(&r->level[1].cat, fp);
        if (rc)
            return rc;
    }

    return 0;
}

static int sens_write(void *vkey, void *datum, void *ptr)
{
    char *key = vkey;
    struct level_datum *levdatum = datum;
    struct policy_data *pd = ptr;
    void *fp = pd->fp;
    __le32 buf[2];
    size_t len;
    int rc;

    len = strlen(key);
    buf[0] = cpu_to_le32(len);
    buf[1] = cpu_to_le32(levdatum->isalias);
    rc = put_entry(buf, sizeof(u32), 2, fp);
    if (rc)
        return rc;

    rc = put_entry(key, 1, len, fp);
    if (rc)
        return rc;

    rc = mls_write_level(levdatum->level, fp);
    if (rc)
        return rc;

    return 0;
}

static int cat_write(void *vkey, void *datum, void *ptr)
{
    char *key = vkey;
    struct cat_datum *catdatum = datum;
    struct policy_data *pd = ptr;
    void *fp = pd->fp;
    __le32 buf[3];
    size_t len;
    int rc;

    len = strlen(key);
    buf[0] = cpu_to_le32(len);
    buf[1] = cpu_to_le32(catdatum->value);
    buf[2] = cpu_to_le32(catdatum->isalias);
    rc = put_entry(buf, sizeof(u32), 3, fp);
    if (rc)
        return rc;

    rc = put_entry(key, 1, len, fp);
    if (rc)
        return rc;

    return 0;
}

static int role_trans_write(struct policydb *p, void *fp)
{
    struct role_trans *r = p->role_tr;
    struct role_trans *tr;
    u32 buf[3];
    size_t nel;
    int rc;

    nel = 0;
    for (tr = r; tr; tr = tr->next)
        nel++;
    buf[0] = cpu_to_le32(nel);
    rc = put_entry(buf, sizeof(u32), 1, fp);
    if (rc)
        return rc;
    for (tr = r; tr; tr = tr->next) {
        buf[0] = cpu_to_le32(tr->role);
        buf[1] = cpu_to_le32(tr->type);
        buf[2] = cpu_to_le32(tr->new_role);
        rc = put_entry(buf, sizeof(u32), 3, fp);
        if (rc)
            return rc;
        if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
            buf[0] = cpu_to_le32(tr->tclass);
            rc = put_entry(buf, sizeof(u32), 1, fp);
            if (rc)
                return rc;
        }
    }

    return 0;
}

static int role_allow_write(struct role_allow *r, void *fp)
{
    struct role_allow *ra;
    u32 buf[2];
    size_t nel;
    int rc;

    nel = 0;
    for (ra = r; ra; ra = ra->next)
        nel++;
    buf[0] = cpu_to_le32(nel);
    rc = put_entry(buf, sizeof(u32), 1, fp);
    if (rc)
        return rc;
    for (ra = r; ra; ra = ra->next) {
        buf[0] = cpu_to_le32(ra->role);
        buf[1] = cpu_to_le32(ra->new_role);
        rc = put_entry(buf, sizeof(u32), 2, fp);
        if (rc)
            return rc;
    }
    return 0;
}

/*
 * Write a security context structure
 * to a policydb binary representation file.
 */
static int context_write(struct policydb *p, struct context *c,
             void *fp)
{
    int rc;
    __le32 buf[3];

    buf[0] = cpu_to_le32(c->user);
    buf[1] = cpu_to_le32(c->role);
    buf[2] = cpu_to_le32(c->type);

    rc = put_entry(buf, sizeof(u32), 3, fp);
    if (rc)
        return rc;

    rc = mls_write_range_helper(&c->range, fp);
    if (rc)
        return rc;

    return 0;
}

/*
 * The following *_write functions are used to
 * write the symbol data to a policy database
 * binary representation file.
 */

static int perm_write(void *vkey, void *datum, void *fp)
{
    char *key = vkey;
    struct perm_datum *perdatum = datum;
    __le32 buf[2];
    size_t len;
    int rc;

    len = strlen(key);
    buf[0] = cpu_to_le32(len);
    buf[1] = cpu_to_le32(perdatum->value);
    rc = put_entry(buf, sizeof(u32), 2, fp);
    if (rc)
        return rc;

    rc = put_entry(key, 1, len, fp);
    if (rc)
        return rc;

    return 0;
}

static int common_write(void *vkey, void *datum, void *ptr)
{
    char *key = vkey;
    struct common_datum *comdatum = datum;
    struct policy_data *pd = ptr;
    void *fp = pd->fp;
    __le32 buf[4];
    size_t len;
    int rc;

    len = strlen(key);
    buf[0] = cpu_to_le32(len);
    buf[1] = cpu_to_le32(comdatum->value);
    buf[2] = cpu_to_le32(comdatum->permissions.nprim);
    buf[3] = cpu_to_le32(comdatum->permissions.table->nel);
    rc = put_entry(buf, sizeof(u32), 4, fp);
    if (rc)
        return rc;

    rc = put_entry(key, 1, len, fp);
    if (rc)
        return rc;

    rc = hashtab_map(comdatum->permissions.table, perm_write, fp);
    if (rc)
        return rc;

    return 0;
}

static int write_cons_helper(struct policydb *p, struct constraint_node *node,
                 void *fp)
{
    struct constraint_node *c;
    struct constraint_expr *e;
    __le32 buf[3];
    u32 nel;
    int rc;

    for (c = node; c; c = c->next) {
        nel = 0;
        for (e = c->expr; e; e = e->next)
            nel++;
        buf[0] = cpu_to_le32(c->permissions);
        buf[1] = cpu_to_le32(nel);
        rc = put_entry(buf, sizeof(u32), 2, fp);
        if (rc)
            return rc;
        for (e = c->expr; e; e = e->next) {
            buf[0] = cpu_to_le32(e->expr_type);
            buf[1] = cpu_to_le32(e->attr);
            buf[2] = cpu_to_le32(e->op);
            rc = put_entry(buf, sizeof(u32), 3, fp);
            if (rc)
                return rc;

            switch (e->expr_type) {
            case CEXPR_NAMES:
                rc = ebitmap_write(&e->names, fp);
                if (rc)
                    return rc;
                break;
            default:
                break;
            }
        }
    }

    return 0;
}

static int class_write(void *vkey, void *datum, void *ptr)
{
    char *key = vkey;
    struct class_datum *cladatum = datum;
    struct policy_data *pd = ptr;
    void *fp = pd->fp;
    struct policydb *p = pd->p;
    struct constraint_node *c;
    __le32 buf[6];
    u32 ncons;
    size_t len, len2;
    int rc;

    len = strlen(key);
    if (cladatum->comkey)
        len2 = strlen(cladatum->comkey);
    else
        len2 = 0;

    ncons = 0;
    for (c = cladatum->constraints; c; c = c->next)
        ncons++;

    buf[0] = cpu_to_le32(len);
    buf[1] = cpu_to_le32(len2);
    buf[2] = cpu_to_le32(cladatum->value);
    buf[3] = cpu_to_le32(cladatum->permissions.nprim);
    if (cladatum->permissions.table)
        buf[4] = cpu_to_le32(cladatum->permissions.table->nel);
    else
        buf[4] = 0;
    buf[5] = cpu_to_le32(ncons);
    rc = put_entry(buf, sizeof(u32), 6, fp);
    if (rc)
        return rc;

    rc = put_entry(key, 1, len, fp);
    if (rc)
        return rc;

    if (cladatum->comkey) {
        rc = put_entry(cladatum->comkey, 1, len2, fp);
        if (rc)
            return rc;
    }

    rc = hashtab_map(cladatum->permissions.table, perm_write, fp);
    if (rc)
        return rc;

    rc = write_cons_helper(p, cladatum->constraints, fp);
    if (rc)
        return rc;

    /* write out the validatetrans rule */
    ncons = 0;
    for (c = cladatum->validatetrans; c; c = c->next)
        ncons++;

    buf[0] = cpu_to_le32(ncons);
    rc = put_entry(buf, sizeof(u32), 1, fp);
    if (rc)
        return rc;

    rc = write_cons_helper(p, cladatum->validatetrans, fp);
    if (rc)
        return rc;

    if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
        buf[0] = cpu_to_le32(cladatum->default_user);
        buf[1] = cpu_to_le32(cladatum->default_role);
        buf[2] = cpu_to_le32(cladatum->default_range);

        rc = put_entry(buf, sizeof(uint32_t), 3, fp);
        if (rc)
            return rc;
    }

    if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
        buf[0] = cpu_to_le32(cladatum->default_type);
        rc = put_entry(buf, sizeof(uint32_t), 1, fp);
        if (rc)
            return rc;
    }

    return 0;
}

static int role_write(void *vkey, void *datum, void *ptr)
{
    char *key = vkey;
    struct role_datum *role = datum;
    struct policy_data *pd = ptr;
    void *fp = pd->fp;
    struct policydb *p = pd->p;
    __le32 buf[3];
    size_t items, len;
    int rc;

    len = strlen(key);
    items = 0;
    buf[items++] = cpu_to_le32(len);
    buf[items++] = cpu_to_le32(role->value);
    if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
        buf[items++] = cpu_to_le32(role->bounds);

    BUG_ON(items > (sizeof(buf)/sizeof(buf[0])));

    rc = put_entry(buf, sizeof(u32), items, fp);
    if (rc)
        return rc;

    rc = put_entry(key, 1, len, fp);
    if (rc)
        return rc;

    rc = ebitmap_write(&role->dominates, fp);
    if (rc)
        return rc;

    rc = ebitmap_write(&role->types, fp);
    if (rc)
        return rc;

    return 0;
}

static int type_write(void *vkey, void *datum, void *ptr)
{
    char *key = vkey;
    struct type_datum *typdatum = datum;
    struct policy_data *pd = ptr;
    struct policydb *p = pd->p;
    void *fp = pd->fp;
    __le32 buf[4];
    int rc;
    size_t items, len;

    len = strlen(key);
    items = 0;
    buf[items++] = cpu_to_le32(len);
    buf[items++] = cpu_to_le32(typdatum->value);
    if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
        u32 properties = 0;

        if (typdatum->primary)
            properties |= TYPEDATUM_PROPERTY_PRIMARY;

        if (typdatum->attribute)
            properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;

        buf[items++] = cpu_to_le32(properties);
        buf[items++] = cpu_to_le32(typdatum->bounds);
    } else {
        buf[items++] = cpu_to_le32(typdatum->primary);
    }
    BUG_ON(items > (sizeof(buf) / sizeof(buf[0])));
    rc = put_entry(buf, sizeof(u32), items, fp);
    if (rc)
        return rc;

    rc = put_entry(key, 1, len, fp);
    if (rc)
        return rc;

    return 0;
}

static int user_write(void *vkey, void *datum, void *ptr)
{
    char *key = vkey;
    struct user_datum *usrdatum = datum;
    struct policy_data *pd = ptr;
    struct policydb *p = pd->p;
    void *fp = pd->fp;
    __le32 buf[3];
    size_t items, len;
    int rc;

    len = strlen(key);
    items = 0;
    buf[items++] = cpu_to_le32(len);
    buf[items++] = cpu_to_le32(usrdatum->value);
    if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
        buf[items++] = cpu_to_le32(usrdatum->bounds);
    BUG_ON(items > (sizeof(buf) / sizeof(buf[0])));
    rc = put_entry(buf, sizeof(u32), items, fp);
    if (rc)
        return rc;

    rc = put_entry(key, 1, len, fp);
    if (rc)
        return rc;

    rc = ebitmap_write(&usrdatum->roles, fp);
    if (rc)
        return rc;

    rc = mls_write_range_helper(&usrdatum->range, fp);
    if (rc)
        return rc;

    rc = mls_write_level(&usrdatum->dfltlevel, fp);
    if (rc)
        return rc;

    return 0;
}

static int (*write_f[SYM_NUM]) (void *key, void *datum,
                void *datap) =
{
    common_write,
    class_write,
    role_write,
    type_write,
    user_write,
    cond_write_bool,
    sens_write,
    cat_write,
};

static int ocontext_write(struct policydb *p, struct policydb_compat_info *info,
              void *fp)
{
    unsigned int i, j, rc;
    size_t nel, len;
    __le32 buf[3];
    u32 nodebuf[8];
    struct ocontext *c;
    for (i = 0; i < info->ocon_num; i++) {
        nel = 0;
        for (c = p->ocontexts[i]; c; c = c->next)
            nel++;
        buf[0] = cpu_to_le32(nel);
        rc = put_entry(buf, sizeof(u32), 1, fp);
        if (rc)
            return rc;
        for (c = p->ocontexts[i]; c; c = c->next) {
            switch (i) {
            case OCON_ISID:
                buf[0] = cpu_to_le32(c->sid[0]);
                rc = put_entry(buf, sizeof(u32), 1, fp);
                if (rc)
                    return rc;
                rc = context_write(p, &c->context[0], fp);
                if (rc)
                    return rc;
                break;
            case OCON_FS:
            case OCON_NETIF:
                len = strlen(c->u.name);
                buf[0] = cpu_to_le32(len);
                rc = put_entry(buf, sizeof(u32), 1, fp);
                if (rc)
                    return rc;
                rc = put_entry(c->u.name, 1, len, fp);
                if (rc)
                    return rc;
                rc = context_write(p, &c->context[0], fp);
                if (rc)
                    return rc;
                rc = context_write(p, &c->context[1], fp);
                if (rc)
                    return rc;
                break;
            case OCON_PORT:
                buf[0] = cpu_to_le32(c->u.port.protocol);
                buf[1] = cpu_to_le32(c->u.port.low_port);
                buf[2] = cpu_to_le32(c->u.port.high_port);
                rc = put_entry(buf, sizeof(u32), 3, fp);
                if (rc)
                    return rc;
                rc = context_write(p, &c->context[0], fp);
                if (rc)
                    return rc;
                break;
            case OCON_NODE:
                nodebuf[0] = c->u.node.addr; /* network order */
                nodebuf[1] = c->u.node.mask; /* network order */
                rc = put_entry(nodebuf, sizeof(u32), 2, fp);
                if (rc)
                    return rc;
                rc = context_write(p, &c->context[0], fp);
                if (rc)
                    return rc;
                break;
            case OCON_FSUSE:
                buf[0] = cpu_to_le32(c->v.behavior);
                len = strlen(c->u.name);
                buf[1] = cpu_to_le32(len);
                rc = put_entry(buf, sizeof(u32), 2, fp);
                if (rc)
                    return rc;
                rc = put_entry(c->u.name, 1, len, fp);
                if (rc)
                    return rc;
                rc = context_write(p, &c->context[0], fp);
                if (rc)
                    return rc;
                break;
            case OCON_NODE6:
                for (j = 0; j < 4; j++)
                    nodebuf[j] = c->u.node6.addr[j]; /* network order */
                for (j = 0; j < 4; j++)
                    nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */
                rc = put_entry(nodebuf, sizeof(u32), 8, fp);
                if (rc)
                    return rc;
                rc = context_write(p, &c->context[0], fp);
                if (rc)
                    return rc;
                break;
            }
        }
    }
    return 0;
}

static int genfs_write(struct policydb *p, void *fp)
{
    struct genfs *genfs;
    struct ocontext *c;
    size_t len;
    __le32 buf[1];
    int rc;

    len = 0;
    for (genfs = p->genfs; genfs; genfs = genfs->next)
        len++;
    buf[0] = cpu_to_le32(len);
    rc = put_entry(buf, sizeof(u32), 1, fp);
    if (rc)
        return rc;
    for (genfs = p->genfs; genfs; genfs = genfs->next) {
        len = strlen(genfs->fstype);
        buf[0] = cpu_to_le32(len);
        rc = put_entry(buf, sizeof(u32), 1, fp);
        if (rc)
            return rc;
        rc = put_entry(genfs->fstype, 1, len, fp);
        if (rc)
            return rc;
        len = 0;
        for (c = genfs->head; c; c = c->next)
            len++;
        buf[0] = cpu_to_le32(len);
        rc = put_entry(buf, sizeof(u32), 1, fp);
        if (rc)
            return rc;
        for (c = genfs->head; c; c = c->next) {
            len = strlen(c->u.name);
            buf[0] = cpu_to_le32(len);
            rc = put_entry(buf, sizeof(u32), 1, fp);
            if (rc)
                return rc;
            rc = put_entry(c->u.name, 1, len, fp);
            if (rc)
                return rc;
            buf[0] = cpu_to_le32(c->v.sclass);
            rc = put_entry(buf, sizeof(u32), 1, fp);
            if (rc)
                return rc;
            rc = context_write(p, &c->context[0], fp);
            if (rc)
                return rc;
        }
    }
    return 0;
}

static int hashtab_cnt(void *key, void *data, void *ptr)
{
    int *cnt = ptr;
    *cnt = *cnt + 1;

    return 0;
}

static int range_write_helper(void *key, void *data, void *ptr)
{
    __le32 buf[2];
    struct range_trans *rt = key;
    struct mls_range *r = data;
    struct policy_data *pd = ptr;
    void *fp = pd->fp;
    struct policydb *p = pd->p;
    int rc;

    buf[0] = cpu_to_le32(rt->source_type);
    buf[1] = cpu_to_le32(rt->target_type);
    rc = put_entry(buf, sizeof(u32), 2, fp);
    if (rc)
        return rc;
    if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
        buf[0] = cpu_to_le32(rt->target_class);
        rc = put_entry(buf, sizeof(u32), 1, fp);
        if (rc)
            return rc;
    }
    rc = mls_write_range_helper(r, fp);
    if (rc)
        return rc;

    return 0;
}

static int range_write(struct policydb *p, void *fp)
{
    size_t nel;
    __le32 buf[1];
    int rc;
    struct policy_data pd;

    pd.p = p;
    pd.fp = fp;

    /* count the number of entries in the hashtab */
    nel = 0;
    rc = hashtab_map(p->range_tr, hashtab_cnt, &nel);
    if (rc)
        return rc;

    buf[0] = cpu_to_le32(nel);
    rc = put_entry(buf, sizeof(u32), 1, fp);
    if (rc)
        return rc;

    /* actually write all of the entries */
    rc = hashtab_map(p->range_tr, range_write_helper, &pd);
    if (rc)
        return rc;

    return 0;
}

static int filename_write_helper(void *key, void *data, void *ptr)
{
    __le32 buf[4];
    struct filename_trans *ft = key;
    struct filename_trans_datum *otype = data;
    void *fp = ptr;
    int rc;
    u32 len;

    len = strlen(ft->name);
    buf[0] = cpu_to_le32(len);
    rc = put_entry(buf, sizeof(u32), 1, fp);
    if (rc)
        return rc;

    rc = put_entry(ft->name, sizeof(char), len, fp);
    if (rc)
        return rc;

    buf[0] = ft->stype;
    buf[1] = ft->ttype;
    buf[2] = ft->tclass;
    buf[3] = otype->otype;

    rc = put_entry(buf, sizeof(u32), 4, fp);
    if (rc)
        return rc;

    return 0;
}

static int filename_trans_write(struct policydb *p, void *fp)
{
    u32 nel;
    __le32 buf[1];
    int rc;

    if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
        return 0;

    nel = 0;
    rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel);
    if (rc)
        return rc;

    buf[0] = cpu_to_le32(nel);
    rc = put_entry(buf, sizeof(u32), 1, fp);
    if (rc)
        return rc;

    rc = hashtab_map(p->filename_trans, filename_write_helper, fp);
    if (rc)
        return rc;

    return 0;
}

/*
 * Write the configuration data in a policy database
 * structure to a policy database binary representation
 * file.
 */
int policydb_write(struct policydb *p, void *fp)
{
    unsigned int i, num_syms;
    int rc;
    __le32 buf[4];
    u32 config;
    size_t len;
    struct policydb_compat_info *info;

    /*
     * refuse to write policy older than compressed avtab
     * to simplify the writer.  There are other tests dropped
     * since we assume this throughout the writer code.  Be
     * careful if you ever try to remove this restriction
     */
    if (p->policyvers < POLICYDB_VERSION_AVTAB) {
        printk(KERN_ERR "SELinux: refusing to write policy version %d."
               "  Because it is less than version %d\n", p->policyvers,
               POLICYDB_VERSION_AVTAB);
        return -EINVAL;
    }

    config = 0;
    if (p->mls_enabled)
        config |= POLICYDB_CONFIG_MLS;

    if (p->reject_unknown)
        config |= REJECT_UNKNOWN;
    if (p->allow_unknown)
        config |= ALLOW_UNKNOWN;

    /* Write the magic number and string identifiers. */
    buf[0] = cpu_to_le32(POLICYDB_MAGIC);
    len = strlen(POLICYDB_STRING);
    buf[1] = cpu_to_le32(len);
    rc = put_entry(buf, sizeof(u32), 2, fp);
    if (rc)
        return rc;
    rc = put_entry(POLICYDB_STRING, 1, len, fp);
    if (rc)
        return rc;

    /* Write the version, config, and table sizes. */
    info = policydb_lookup_compat(p->policyvers);
    if (!info) {
        printk(KERN_ERR "SELinux: compatibility lookup failed for policy "
            "version %d", p->policyvers);
        return -EINVAL;
    }

    buf[0] = cpu_to_le32(p->policyvers);
    buf[1] = cpu_to_le32(config);
    buf[2] = cpu_to_le32(info->sym_num);
    buf[3] = cpu_to_le32(info->ocon_num);

    rc = put_entry(buf, sizeof(u32), 4, fp);
    if (rc)
        return rc;

    if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
        rc = ebitmap_write(&p->policycaps, fp);
        if (rc)
            return rc;
    }

    if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
        rc = ebitmap_write(&p->permissive_map, fp);
        if (rc)
            return rc;
    }

    num_syms = info->sym_num;
    for (i = 0; i < num_syms; i++) {
        struct policy_data pd;

        pd.fp = fp;
        pd.p = p;

        buf[0] = cpu_to_le32(p->symtab[i].nprim);
        buf[1] = cpu_to_le32(p->symtab[i].table->nel);

        rc = put_entry(buf, sizeof(u32), 2, fp);
        if (rc)
            return rc;
        rc = hashtab_map(p->symtab[i].table, write_f[i], &pd);
        if (rc)
            return rc;
    }

    rc = avtab_write(p, &p->te_avtab, fp);
    if (rc)
        return rc;

    rc = cond_write_list(p, p->cond_list, fp);
    if (rc)
        return rc;

    rc = role_trans_write(p, fp);
    if (rc)
        return rc;

    rc = role_allow_write(p->role_allow, fp);
    if (rc)
        return rc;

    rc = filename_trans_write(p, fp);
    if (rc)
        return rc;

    rc = ocontext_write(p, info, fp);
    if (rc)
        return rc;

    rc = genfs_write(p, fp);
    if (rc)
        return rc;

    rc = range_write(p, fp);
    if (rc)
        return rc;

    for (i = 0; i < p->p_types.nprim; i++) {
        struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);

        BUG_ON(!e);
        rc = ebitmap_write(e, fp);
        if (rc)
            return rc;
    }

    return 0;
}