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selinux/stable-5.9 PR 20200803 

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Merge tag 'selinux-pr-20200803' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux

Pull selinux updates from Paul Moore:
 "Beyond the usual smattering of bug fixes, we've got three small
  improvements worth highlighting:

   - improved SELinux policy symbol table performance due to a reworking
     of the insert and search functions

   - allow reading of SELinux labels before the policy is loaded,
     allowing for some more "exotic" initramfs approaches

   - improved checking an error reporting about process
     class/permissions during SELinux policy load"

* tag 'selinux-pr-20200803' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux:
  selinux: complete the inlining of hashtab functions
  selinux: prepare for inlining of hashtab functions
  selinux: specialize symtab insert and search functions
  selinux: Fix spelling mistakes in the comments
  selinux: fixed a checkpatch warning with the sizeof macro
  selinux: log error messages on required process class / permissions
  scripts/selinux/mdp: fix initial SID handling
  selinux: allow reading labels before policy is loaded
5.9.x+fslc
Linus Torvalds 2020-08-04 14:18:01 -07:00
parent 9ecc6ea491 54b27f9287
commit 49e917deeb
15 changed files with 258 additions and 166 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
scripts/selinux/mdp/mdp.c
View File

@ -67,8 +67,14 @@ int main(int argc, char *argv[])
initial_sid_to_string_len = sizeof(initial_sid_to_string) / sizeof (char *);
/* print out the sids */
for (i = 1; i < initial_sid_to_string_len; i++)
fprintf(fout, "sid %s\n", initial_sid_to_string[i]);
for (i = 1; i < initial_sid_to_string_len; i++) {
const char *name = initial_sid_to_string[i];
if (name)
fprintf(fout, "sid %s\n", name);
else
fprintf(fout, "sid unused%d\n", i);
}
fprintf(fout, "\n");
/* print out the class permissions */
@ -126,9 +132,16 @@ int main(int argc, char *argv[])
#define OBJUSERROLETYPE "user_u:object_r:base_t"
/* default sids */
for (i = 1; i < initial_sid_to_string_len; i++)
fprintf(fout, "sid %s " SUBJUSERROLETYPE "%s\n",
initial_sid_to_string[i], mls ? ":" SYSTEMLOW : "");
for (i = 1; i < initial_sid_to_string_len; i++) {
const char *name = initial_sid_to_string[i];
if (name)
fprintf(fout, "sid %s ", name);
else
fprintf(fout, "sid unused%d\n", i);
fprintf(fout, SUBJUSERROLETYPE "%s\n",
mls ? ":" SYSTEMLOW : "");
}
fprintf(fout, "\n");
#define FS_USE(behavior, fstype) \

7
security/selinux/hooks.c
View File

@ -3332,7 +3332,12 @@ static int selinux_inode_getsecurity(struct inode *inode, const char *name, void
char *context = NULL;
struct inode_security_struct *isec;
if (strcmp(name, XATTR_SELINUX_SUFFIX))
/*
* If we're not initialized yet, then we can't validate contexts, so
* just let vfs_getxattr fall back to using the on-disk xattr.
*/
if (!selinux_initialized(&selinux_state) ||
strcmp(name, XATTR_SELINUX_SUFFIX))
return -EOPNOTSUPP;
/*

2
security/selinux/netif.c
View File

@ -124,7 +124,7 @@ static void sel_netif_destroy(struct sel_netif *netif)
* @sid: interface SID
*
* Description:
* This function determines the SID of a network interface by quering the
* This function determines the SID of a network interface by querying the
* security policy. The result is added to the network interface table to
* speedup future queries. Returns zero on success, negative values on
* failure.

2
security/selinux/netnode.c
View File

@ -181,7 +181,7 @@ static void sel_netnode_insert(struct sel_netnode *node)
* @sid: node SID
*
* Description:
* This function determines the SID of a network address by quering the
* This function determines the SID of a network address by querying the
* security policy. The result is added to the network address table to
* speedup future queries. Returns zero on success, negative values on
* failure.

2
security/selinux/netport.c
View File

@ -130,7 +130,7 @@ static void sel_netport_insert(struct sel_netport *port)
* @sid: port SID
*
* Description:
* This function determines the SID of a network port by quering the security
* This function determines the SID of a network port by querying the security
* policy. The result is added to the network port table to speedup future
* queries. Returns zero on success, negative values on failure.
*

8
security/selinux/ss/conditional.c
View File

@ -203,7 +203,7 @@ static int bool_isvalid(struct cond_bool_datum *b)
return 1;
}
int cond_read_bool(struct policydb *p, struct hashtab *h, void *fp)
int cond_read_bool(struct policydb *p, struct symtab *s, void *fp)
{
char *key = NULL;
struct cond_bool_datum *booldatum;
@ -215,7 +215,7 @@ int cond_read_bool(struct policydb *p, struct hashtab *h, void *fp)
if (!booldatum)
return -ENOMEM;
rc = next_entry(buf, fp, sizeof buf);
rc = next_entry(buf, fp, sizeof(buf));
if (rc)
goto err;
@ -238,7 +238,7 @@ int cond_read_bool(struct policydb *p, struct hashtab *h, void *fp)
if (rc)
goto err;
key[len] = '\0';
rc = hashtab_insert(h, key, booldatum);
rc = symtab_insert(s, key, booldatum);
if (rc)
goto err;
@ -416,7 +416,7 @@ int cond_read_list(struct policydb *p, void *fp)
u32 i, len;
int rc;
rc = next_entry(buf, fp, sizeof buf);
rc = next_entry(buf, fp, sizeof(buf));
if (rc)
return rc;

2
security/selinux/ss/conditional.h
View File

@ -69,7 +69,7 @@ int cond_destroy_bool(void *key, void *datum, void *p);
int cond_index_bool(void *key, void *datum, void *datap);
int cond_read_bool(struct policydb *p, struct hashtab *h, void *fp);
int cond_read_bool(struct policydb *p, struct symtab *s, void *fp);
int cond_read_list(struct policydb *p, void *fp);
int cond_write_bool(void *key, void *datum, void *ptr);
int cond_write_list(struct policydb *p, void *fp);

59
security/selinux/ss/hashtab.c
View File

@ -7,7 +7,6 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include "hashtab.h"
static struct kmem_cache *hashtab_node_cachep;
@ -29,16 +28,10 @@ static u32 hashtab_compute_size(u32 nel)
return nel == 0 ? 0 : roundup_pow_of_two(nel);
}
int hashtab_init(struct hashtab *h,
u32 (*hash_value)(struct hashtab *h, const void *key),
int (*keycmp)(struct hashtab *h, const void *key1,
const void *key2),
u32 nel_hint)
int hashtab_init(struct hashtab *h, u32 nel_hint)
{
h->size = hashtab_compute_size(nel_hint);
h->nel = 0;
h->hash_value = hash_value;
h->keycmp = keycmp;
if (!h->size)
return 0;
@ -46,63 +39,23 @@ int hashtab_init(struct hashtab *h,
return h->htable ? 0 : -ENOMEM;
}
int hashtab_insert(struct hashtab *h, void *key, void *datum)
int __hashtab_insert(struct hashtab *h, struct hashtab_node **dst,
void *key, void *datum)
{
u32 hvalue;
struct hashtab_node *prev, *cur, *newnode;
cond_resched();
if (!h->size || h->nel == HASHTAB_MAX_NODES)
return -EINVAL;
hvalue = h->hash_value(h, key);
prev = NULL;
cur = h->htable[hvalue];
while (cur && h->keycmp(h, key, cur->key) > 0) {
prev = cur;
cur = cur->next;
}
if (cur && (h->keycmp(h, key, cur->key) == 0))
return -EEXIST;
struct hashtab_node *newnode;
newnode = kmem_cache_zalloc(hashtab_node_cachep, GFP_KERNEL);
if (!newnode)
return -ENOMEM;
newnode->key = key;
newnode->datum = datum;
if (prev) {
newnode->next = prev->next;
prev->next = newnode;
} else {
newnode->next = h->htable[hvalue];
h->htable[hvalue] = newnode;
}
newnode->next = *dst;
*dst = newnode;
h->nel++;
return 0;
}
void *hashtab_search(struct hashtab *h, const void *key)
{
u32 hvalue;
struct hashtab_node *cur;
if (!h->size)
return NULL;
hvalue = h->hash_value(h, key);
cur = h->htable[hvalue];
while (cur && h->keycmp(h, key, cur->key) > 0)
cur = cur->next;
if (!cur || (h->keycmp(h, key, cur->key) != 0))
return NULL;
return cur->datum;
}
void hashtab_destroy(struct hashtab *h)
{
u32 i;

77
security/selinux/ss/hashtab.h
View File

@ -11,7 +11,17 @@
#ifndef _SS_HASHTAB_H_
#define _SS_HASHTAB_H_
#define HASHTAB_MAX_NODES 0xffffffff
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/sched.h>
#define HASHTAB_MAX_NODES U32_MAX
struct hashtab_key_params {
u32 (*hash)(const void *key); /* hash function */
int (*cmp)(const void *key1, const void *key2);
/* key comparison function */
};
struct hashtab_node {
void *key;
@ -23,10 +33,6 @@ struct hashtab {
struct hashtab_node **htable; /* hash table */
u32 size; /* number of slots in hash table */
u32 nel; /* number of elements in hash table */
u32 (*hash_value)(struct hashtab *h, const void *key);
/* hash function */
int (*keycmp)(struct hashtab *h, const void *key1, const void *key2);
/* key comparison function */
};
struct hashtab_info {
@ -39,11 +45,10 @@ struct hashtab_info {
*
* Returns -ENOMEM if insufficient space is available or 0 otherwise.
*/
int hashtab_init(struct hashtab *h,
u32 (*hash_value)(struct hashtab *h, const void *key),
int (*keycmp)(struct hashtab *h, const void *key1,
const void *key2),
u32 nel_hint);
int hashtab_init(struct hashtab *h, u32 nel_hint);
int __hashtab_insert(struct hashtab *h, struct hashtab_node **dst,
void *key, void *datum);
/*
* Inserts the specified (key, datum) pair into the specified hash table.
@ -53,7 +58,34 @@ int hashtab_init(struct hashtab *h,
* -EINVAL for general errors or
0 otherwise.
*/
int hashtab_insert(struct hashtab *h, void *k, void *d);
static inline int hashtab_insert(struct hashtab *h, void *key, void *datum,
struct hashtab_key_params key_params)
{
u32 hvalue;
struct hashtab_node *prev, *cur;
cond_resched();
if (!h->size || h->nel == HASHTAB_MAX_NODES)
return -EINVAL;
hvalue = key_params.hash(key) & (h->size - 1);
prev = NULL;
cur = h->htable[hvalue];
while (cur) {
int cmp = key_params.cmp(key, cur->key);
if (cmp == 0)
return -EEXIST;
if (cmp < 0)
break;
prev = cur;
cur = cur->next;
}
return __hashtab_insert(h, prev ? &prev->next : &h->htable[hvalue],
key, datum);
}
/*
* Searches for the entry with the specified key in the hash table.
@ -61,7 +93,28 @@ int hashtab_insert(struct hashtab *h, void *k, void *d);
* Returns NULL if no entry has the specified key or
* the datum of the entry otherwise.
*/
void *hashtab_search(struct hashtab *h, const void *k);
static inline void *hashtab_search(struct hashtab *h, const void *key,
struct hashtab_key_params key_params)
{
u32 hvalue;
struct hashtab_node *cur;
if (!h->size)
return NULL;
hvalue = key_params.hash(key) & (h->size - 1);
cur = h->htable[hvalue];
while (cur) {
int cmp = key_params.cmp(key, cur->key);
if (cmp == 0)
return cur->datum;
if (cmp < 0)
break;
cur = cur->next;
}
return NULL;
}
/*
* Destroys the specified hash table.

23
security/selinux/ss/mls.c
View File

@ -165,8 +165,8 @@ int mls_level_isvalid(struct policydb *p, struct mls_level *l)
if (!l->sens || l->sens > p->p_levels.nprim)
return 0;
levdatum = hashtab_search(&p->p_levels.table,
sym_name(p, SYM_LEVELS, l->sens - 1));
levdatum = symtab_search(&p->p_levels,
sym_name(p, SYM_LEVELS, l->sens - 1));
if (!levdatum)
return 0;
@ -293,7 +293,7 @@ int mls_context_to_sid(struct policydb *pol,
*(next_cat++) = '\0';
/* Parse sensitivity. */
levdatum = hashtab_search(&pol->p_levels.table, sensitivity);
levdatum = symtab_search(&pol->p_levels, sensitivity);
if (!levdatum)
return -EINVAL;
context->range.level[l].sens = levdatum->level->sens;
@ -312,7 +312,7 @@ int mls_context_to_sid(struct policydb *pol,
*rngptr++ = '\0';
}
catdatum = hashtab_search(&pol->p_cats.table, cur_cat);
catdatum = symtab_search(&pol->p_cats, cur_cat);
if (!catdatum)
return -EINVAL;
@ -325,7 +325,7 @@ int mls_context_to_sid(struct policydb *pol,
if (rngptr == NULL)
continue;
rngdatum = hashtab_search(&pol->p_cats.table, rngptr);
rngdatum = symtab_search(&pol->p_cats, rngptr);
if (!rngdatum)
return -EINVAL;
@ -458,9 +458,10 @@ int mls_convert_context(struct policydb *oldp,
return 0;
for (l = 0; l < 2; l++) {
levdatum = hashtab_search(&newp->p_levels.table,
sym_name(oldp, SYM_LEVELS,
oldc->range.level[l].sens - 1));
char *name = sym_name(oldp, SYM_LEVELS,
oldc->range.level[l].sens - 1);
levdatum = symtab_search(&newp->p_levels, name);
if (!levdatum)
return -EINVAL;
@ -470,8 +471,8 @@ int mls_convert_context(struct policydb *oldp,
node, i) {
int rc;
catdatum = hashtab_search(&newp->p_cats.table,
sym_name(oldp, SYM_CATS, i));
catdatum = symtab_search(&newp->p_cats,
sym_name(oldp, SYM_CATS, i));
if (!catdatum)
return -EINVAL;
rc = ebitmap_set_bit(&newc->range.level[l].cat,
@ -506,7 +507,7 @@ int mls_compute_sid(struct policydb *p,
rtr.source_type = scontext->type;
rtr.target_type = tcontext->type;
rtr.target_class = tclass;
r = hashtab_search(&p->range_tr, &rtr);
r = policydb_rangetr_search(p, &rtr);
if (r)
return mls_range_set(newcontext, r);

148
security/selinux/ss/policydb.c
View File

@ -400,7 +400,7 @@ static int roles_init(struct policydb *p)
if (!key)
goto out;
rc = hashtab_insert(&p->p_roles.table, key, role);
rc = symtab_insert(&p->p_roles, key, role);
if (rc)
goto out;
@ -411,7 +411,7 @@ out:
return rc;
}
static u32 filenametr_hash(struct hashtab *h, const void *k)
static u32 filenametr_hash(const void *k)
{
const struct filename_trans_key *ft = k;
unsigned long hash;
@ -423,10 +423,10 @@ static u32 filenametr_hash(struct hashtab *h, const void *k)
byte_num = 0;
while ((focus = ft->name[byte_num++]))
hash = partial_name_hash(focus, hash);
return hash & (h->size - 1);
return hash;
}
static int filenametr_cmp(struct hashtab *h, const void *k1, const void *k2)
static int filenametr_cmp(const void *k1, const void *k2)
{
const struct filename_trans_key *ft1 = k1;
const struct filename_trans_key *ft2 = k2;
@ -444,15 +444,26 @@ static int filenametr_cmp(struct hashtab *h, const void *k1, const void *k2)
}
static u32 rangetr_hash(struct hashtab *h, const void *k)
static const struct hashtab_key_params filenametr_key_params = {
.hash = filenametr_hash,
.cmp = filenametr_cmp,
};
struct filename_trans_datum *policydb_filenametr_search(
struct policydb *p, struct filename_trans_key *key)
{
return hashtab_search(&p->filename_trans, key, filenametr_key_params);
}
static u32 rangetr_hash(const void *k)
{
const struct range_trans *key = k;
return (key->source_type + (key->target_type << 3) +
(key->target_class << 5)) & (h->size - 1);
return key->source_type + (key->target_type << 3) +
(key->target_class << 5);
}
static int rangetr_cmp(struct hashtab *h, const void *k1, const void *k2)
static int rangetr_cmp(const void *k1, const void *k2)
{
const struct range_trans *key1 = k1, *key2 = k2;
int v;
@ -470,15 +481,25 @@ static int rangetr_cmp(struct hashtab *h, const void *k1, const void *k2)
return v;
}
static u32 role_trans_hash(struct hashtab *h, const void *k)
static const struct hashtab_key_params rangetr_key_params = {
.hash = rangetr_hash,
.cmp = rangetr_cmp,
};
struct mls_range *policydb_rangetr_search(struct policydb *p,
struct range_trans *key)
{
return hashtab_search(&p->range_tr, key, rangetr_key_params);
}
static u32 role_trans_hash(const void *k)
{
const struct role_trans_key *key = k;
return (key->role + (key->type << 3) + (key->tclass << 5)) &
(h->size - 1);
return key->role + (key->type << 3) + (key->tclass << 5);
}
static int role_trans_cmp(struct hashtab *h, const void *k1, const void *k2)
static int role_trans_cmp(const void *k1, const void *k2)
{
const struct role_trans_key *key1 = k1, *key2 = k2;
int v;
@ -494,6 +515,17 @@ static int role_trans_cmp(struct hashtab *h, const void *k1, const void *k2)
return key1->tclass - key2->tclass;
}
static const struct hashtab_key_params roletr_key_params = {
.hash = role_trans_hash,
.cmp = role_trans_cmp,
};
struct role_trans_datum *policydb_roletr_search(struct policydb *p,
struct role_trans_key *key)
{
return hashtab_search(&p->role_tr, key, roletr_key_params);
}
/*
* Initialize a policy database structure.
*/
@ -1065,7 +1097,7 @@ static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
return 0;
}
static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
static int perm_read(struct policydb *p, struct symtab *s, void *fp)
{
char *key = NULL;
struct perm_datum *perdatum;
@ -1088,7 +1120,7 @@ static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
if (rc)
goto bad;
rc = hashtab_insert(h, key, perdatum);
rc = symtab_insert(s, key, perdatum);
if (rc)
goto bad;
@ -1098,7 +1130,7 @@ bad:
return rc;
}
static int common_read(struct policydb *p, struct hashtab *h, void *fp)
static int common_read(struct policydb *p, struct symtab *s, void *fp)
{
char *key = NULL;
struct common_datum *comdatum;
@ -1128,12 +1160,12 @@ static int common_read(struct policydb *p, struct hashtab *h, void *fp)
goto bad;
for (i = 0; i < nel; i++) {
rc = perm_read(p, &comdatum->permissions.table, fp);
rc = perm_read(p, &comdatum->permissions, fp);
if (rc)
goto bad;
}
rc = hashtab_insert(h, key, comdatum);
rc = symtab_insert(s, key, comdatum);
if (rc)
goto bad;
return 0;
@ -1262,7 +1294,7 @@ static int read_cons_helper(struct policydb *p,
return 0;
}
static int class_read(struct policydb *p, struct hashtab *h, void *fp)
static int class_read(struct policydb *p, struct symtab *s, void *fp)
{
char *key = NULL;
struct class_datum *cladatum;
@ -1300,8 +1332,8 @@ static int class_read(struct policydb *p, struct hashtab *h, void *fp)
goto bad;
rc = -EINVAL;
cladatum->comdatum = hashtab_search(&p->p_commons.table,
cladatum->comkey);
cladatum->comdatum = symtab_search(&p->p_commons,
cladatum->comkey);
if (!cladatum->comdatum) {
pr_err("SELinux: unknown common %s\n",
cladatum->comkey);
@ -1309,7 +1341,7 @@ static int class_read(struct policydb *p, struct hashtab *h, void *fp)
}
}
for (i = 0; i < nel; i++) {
rc = perm_read(p, &cladatum->permissions.table, fp);
rc = perm_read(p, &cladatum->permissions, fp);
if (rc)
goto bad;
}
@ -1347,7 +1379,7 @@ static int class_read(struct policydb *p, struct hashtab *h, void *fp)
cladatum->default_type = le32_to_cpu(buf[0]);
}
rc = hashtab_insert(h, key, cladatum);
rc = symtab_insert(s, key, cladatum);
if (rc)
goto bad;
@ -1357,7 +1389,7 @@ bad:
return rc;
}
static int role_read(struct policydb *p, struct hashtab *h, void *fp)
static int role_read(struct policydb *p, struct symtab *s, void *fp)
{
char *key = NULL;
struct role_datum *role;
@ -1404,7 +1436,7 @@ static int role_read(struct policydb *p, struct hashtab *h, void *fp)
goto bad;
}
rc = hashtab_insert(h, key, role);
rc = symtab_insert(s, key, role);
if (rc)
goto bad;
return 0;
@ -1413,7 +1445,7 @@ bad:
return rc;
}
static int type_read(struct policydb *p, struct hashtab *h, void *fp)
static int type_read(struct policydb *p, struct symtab *s, void *fp)
{
char *key = NULL;
struct type_datum *typdatum;
@ -1451,7 +1483,7 @@ static int type_read(struct policydb *p, struct hashtab *h, void *fp)
if (rc)
goto bad;
rc = hashtab_insert(h, key, typdatum);
rc = symtab_insert(s, key, typdatum);
if (rc)
goto bad;
return 0;
@ -1487,7 +1519,7 @@ static int mls_read_level(struct mls_level *lp, void *fp)
return 0;
}
static int user_read(struct policydb *p, struct hashtab *h, void *fp)
static int user_read(struct policydb *p, struct symtab *s, void *fp)
{
char *key = NULL;
struct user_datum *usrdatum;
@ -1528,7 +1560,7 @@ static int user_read(struct policydb *p, struct hashtab *h, void *fp)
goto bad;
}
rc = hashtab_insert(h, key, usrdatum);
rc = symtab_insert(s, key, usrdatum);
if (rc)
goto bad;
return 0;
@ -1537,7 +1569,7 @@ bad:
return rc;
}
static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
static int sens_read(struct policydb *p, struct symtab *s, void *fp)
{
char *key = NULL;
struct level_datum *levdatum;
@ -1569,7 +1601,7 @@ static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
if (rc)
goto bad;
rc = hashtab_insert(h, key, levdatum);
rc = symtab_insert(s, key, levdatum);
if (rc)
goto bad;
return 0;
@ -1578,7 +1610,7 @@ bad:
return rc;
}
static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
static int cat_read(struct policydb *p, struct symtab *s, void *fp)
{
char *key = NULL;
struct cat_datum *catdatum;
@ -1602,7 +1634,7 @@ static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
if (rc)
goto bad;
rc = hashtab_insert(h, key, catdatum);
rc = symtab_insert(s, key, catdatum);
if (rc)
goto bad;
return 0;
@ -1611,7 +1643,7 @@ bad:
return rc;
}
static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
static int (*read_f[SYM_NUM]) (struct policydb *p, struct symtab *s, void *fp) =
{
common_read,
class_read,
@ -1751,7 +1783,7 @@ u16 string_to_security_class(struct policydb *p, const char *name)
{
struct class_datum *cladatum;
cladatum = hashtab_search(&p->p_classes.table, name);
cladatum = symtab_search(&p->p_classes, name);
if (!cladatum)
return 0;
@ -1770,9 +1802,9 @@ u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
cladatum = p->class_val_to_struct[tclass-1];
comdatum = cladatum->comdatum;
if (comdatum)
perdatum = hashtab_search(&comdatum->permissions.table, name);
perdatum = symtab_search(&comdatum->permissions, name);
if (!perdatum)
perdatum = hashtab_search(&cladatum->permissions.table, name);
perdatum = symtab_search(&cladatum->permissions, name);
if (!perdatum)
return 0;
@ -1796,7 +1828,7 @@ static int range_read(struct policydb *p, void *fp)
nel = le32_to_cpu(buf[0]);
rc = hashtab_init(&p->range_tr, rangetr_hash, rangetr_cmp, nel);
rc = hashtab_init(&p->range_tr, nel);
if (rc)
return rc;
@ -1841,7 +1873,7 @@ static int range_read(struct policydb *p, void *fp)
goto out;
}
rc = hashtab_insert(&p->range_tr, rt, r);
rc = hashtab_insert(&p->range_tr, rt, r, rangetr_key_params);
if (rc)
goto out;
@ -1888,7 +1920,7 @@ static int filename_trans_read_helper_compat(struct policydb *p, void *fp)
otype = le32_to_cpu(buf[3]);
last = NULL;
datum = hashtab_search(&p->filename_trans, &key);
datum = policydb_filenametr_search(p, &key);
while (datum) {
if (unlikely(ebitmap_get_bit(&datum->stypes, stype - 1))) {
/* conflicting/duplicate rules are ignored */
@ -1918,7 +1950,8 @@ static int filename_trans_read_helper_compat(struct policydb *p, void *fp)
if (!ft)
goto out;
rc = hashtab_insert(&p->filename_trans, ft, datum);
rc = hashtab_insert(&p->filename_trans, ft, datum,
filenametr_key_params);
if (rc)
goto out;
name = NULL;
@ -2006,7 +2039,8 @@ static int filename_trans_read_helper(struct policydb *p, void *fp)
ft->tclass = tclass;
ft->name = name;
rc = hashtab_insert(&p->filename_trans, ft, first);
rc = hashtab_insert(&p->filename_trans, ft, first,
filenametr_key_params);
if (rc == -EEXIST)
pr_err("SELinux: Duplicate filename transition key\n");
if (rc)
@ -2044,8 +2078,7 @@ static int filename_trans_read(struct policydb *p, void *fp)
if (p->policyvers < POLICYDB_VERSION_COMP_FTRANS) {
p->compat_filename_trans_count = nel;
rc = hashtab_init(&p->filename_trans, filenametr_hash,
filenametr_cmp, (1 << 11));
rc = hashtab_init(&p->filename_trans, (1 << 11));
if (rc)
return rc;
@ -2055,8 +2088,7 @@ static int filename_trans_read(struct policydb *p, void *fp)
return rc;
}
} else {
rc = hashtab_init(&p->filename_trans, filenametr_hash,
filenametr_cmp, nel);
rc = hashtab_init(&p->filename_trans, nel);
if (rc)
return rc;
@ -2376,7 +2408,7 @@ int policydb_read(struct policydb *p, void *fp)
struct role_trans_datum *rtd = NULL;
int i, j, rc;
__le32 buf[4];
u32 len, nprim, nel;
u32 len, nprim, nel, perm;
char *policydb_str;
struct policydb_compat_info *info;
@ -2509,7 +2541,7 @@ int policydb_read(struct policydb *p, void *fp)
}
for (j = 0; j < nel; j++) {
rc = read_f[i](p, &p->symtab[i].table, fp);
rc = read_f[i](p, &p->symtab[i], fp);
if (rc)
goto bad;
}
@ -2519,8 +2551,10 @@ int policydb_read(struct policydb *p, void *fp)
rc = -EINVAL;
p->process_class = string_to_security_class(p, "process");
if (!p->process_class)
if (!p->process_class) {
pr_err("SELinux: process class is required, not defined in policy\n");
goto bad;
}
rc = avtab_read(&p->te_avtab, fp, p);
if (rc)
@ -2537,7 +2571,7 @@ int policydb_read(struct policydb *p, void *fp)
goto bad;
nel = le32_to_cpu(buf[0]);
rc = hashtab_init(&p->role_tr, role_trans_hash, role_trans_cmp, nel);
rc = hashtab_init(&p->role_tr, nel);
if (rc)
goto bad;
for (i = 0; i < nel; i++) {
@ -2574,7 +2608,7 @@ int policydb_read(struct policydb *p, void *fp)
!policydb_role_isvalid(p, rtd->new_role))
goto bad;
rc = hashtab_insert(&p->role_tr, rtk, rtd);
rc = hashtab_insert(&p->role_tr, rtk, rtd, roletr_key_params);
if (rc)
goto bad;
@ -2618,10 +2652,18 @@ int policydb_read(struct policydb *p, void *fp)
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)
perm = string_to_av_perm(p, p->process_class, "transition");
if (!perm) {
pr_err("SELinux: process transition permission is required, not defined in policy\n");
goto bad;
}
p->process_trans_perms = perm;
perm = string_to_av_perm(p, p->process_class, "dyntransition");
if (!perm) {
pr_err("SELinux: process dyntransition permission is required, not defined in policy\n");
goto bad;
}
p->process_trans_perms |= perm;
rc = ocontext_read(p, info, fp);
if (rc)

9
security/selinux/ss/policydb.h
View File

@ -324,6 +324,15 @@ extern int policydb_role_isvalid(struct policydb *p, unsigned int role);
extern int policydb_read(struct policydb *p, void *fp);
extern int policydb_write(struct policydb *p, void *fp);
extern struct filename_trans_datum *policydb_filenametr_search(
struct policydb *p, struct filename_trans_key *key);
extern struct mls_range *policydb_rangetr_search(
struct policydb *p, struct range_trans *key);
extern struct role_trans_datum *policydb_roletr_search(
struct policydb *p, struct role_trans_key *key);
#define POLICYDB_CONFIG_MLS 1
/* the config flags related to unknown classes/perms are bits 2 and 3 */

38
security/selinux/ss/services.c
View File

@ -1441,7 +1441,7 @@ static int string_to_context_struct(struct policydb *pol,
*p++ = 0;
usrdatum = hashtab_search(&pol->p_users.table, scontextp);
usrdatum = symtab_search(&pol->p_users, scontextp);
if (!usrdatum)
goto out;
@ -1457,7 +1457,7 @@ static int string_to_context_struct(struct policydb *pol,
*p++ = 0;
role = hashtab_search(&pol->p_roles.table, scontextp);
role = symtab_search(&pol->p_roles, scontextp);
if (!role)
goto out;
ctx->role = role->value;
@ -1469,7 +1469,7 @@ static int string_to_context_struct(struct policydb *pol,
oldc = *p;
*p++ = 0;
typdatum = hashtab_search(&pol->p_types.table, scontextp);
typdatum = symtab_search(&pol->p_types, scontextp);
if (!typdatum || typdatum->attribute)
goto out;
@ -1671,7 +1671,7 @@ static void filename_compute_type(struct policydb *policydb,
ft.tclass = tclass;
ft.name = objname;
datum = hashtab_search(&policydb->filename_trans, &ft);
datum = policydb_filenametr_search(policydb, &ft);
while (datum) {
if (ebitmap_get_bit(&datum->stypes, stype - 1)) {
newcontext->type = datum->otype;
@ -1834,7 +1834,7 @@ static int security_compute_sid(struct selinux_state *state,
.tclass = tclass,
};
rtd = hashtab_search(&policydb->role_tr, &rtk);
rtd = policydb_roletr_search(policydb, &rtk);
if (rtd)
newcontext.role = rtd->new_role;
}
@ -2024,26 +2024,26 @@ static int convert_context(struct context *oldc, struct context *newc, void *p)
/* Convert the user. */
rc = -EINVAL;
usrdatum = hashtab_search(&args->newp->p_users.table,
sym_name(args->oldp,
SYM_USERS, oldc->user - 1));
usrdatum = symtab_search(&args->newp->p_users,
sym_name(args->oldp,
SYM_USERS, oldc->user - 1));
if (!usrdatum)
goto bad;
newc->user = usrdatum->value;
/* Convert the role. */
rc = -EINVAL;
role = hashtab_search(&args->newp->p_roles.table,
sym_name(args->oldp, SYM_ROLES, oldc->role - 1));
role = symtab_search(&args->newp->p_roles,
sym_name(args->oldp, SYM_ROLES, oldc->role - 1));
if (!role)
goto bad;
newc->role = role->value;
/* Convert the type. */
rc = -EINVAL;
typdatum = hashtab_search(&args->newp->p_types.table,
sym_name(args->oldp,
SYM_TYPES, oldc->type - 1));
typdatum = symtab_search(&args->newp->p_types,
sym_name(args->oldp,
SYM_TYPES, oldc->type - 1));
if (!typdatum)
goto bad;
newc->type = typdatum->value;
@ -2623,7 +2623,7 @@ int security_get_user_sids(struct selinux_state *state,
goto out_unlock;
rc = -EINVAL;
user = hashtab_search(&policydb->p_users.table, username);
user = symtab_search(&policydb->p_users, username);
if (!user)
goto out_unlock;
@ -2979,7 +2979,7 @@ static int security_preserve_bools(struct selinux_state *state,
if (rc)
goto out;
for (i = 0; i < nbools; i++) {
booldatum = hashtab_search(&policydb->p_bools.table, bnames[i]);
booldatum = symtab_search(&policydb->p_bools, bnames[i]);
if (booldatum)
booldatum->state = bvalues[i];
}
@ -3230,7 +3230,7 @@ int security_get_permissions(struct selinux_state *state,
read_lock(&state->ss->policy_rwlock);
rc = -EINVAL;
match = hashtab_search(&policydb->p_classes.table, class);
match = symtab_search(&policydb->p_classes, class);
if (!match) {
pr_err("SELinux: %s: unrecognized class %s\n",
__func__, class);
@ -3369,7 +3369,7 @@ int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
case AUDIT_SUBJ_USER:
case AUDIT_OBJ_USER:
rc = -EINVAL;
userdatum = hashtab_search(&policydb->p_users.table, rulestr);
userdatum = symtab_search(&policydb->p_users, rulestr);
if (!userdatum)
goto out;
tmprule->au_ctxt.user = userdatum->value;
@ -3377,7 +3377,7 @@ int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
case AUDIT_SUBJ_ROLE:
case AUDIT_OBJ_ROLE:
rc = -EINVAL;
roledatum = hashtab_search(&policydb->p_roles.table, rulestr);
roledatum = symtab_search(&policydb->p_roles, rulestr);
if (!roledatum)
goto out;
tmprule->au_ctxt.role = roledatum->value;
@ -3385,7 +3385,7 @@ int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
case AUDIT_SUBJ_TYPE:
case AUDIT_OBJ_TYPE:
rc = -EINVAL;
typedatum = hashtab_search(&policydb->p_types.table, rulestr);
typedatum = symtab_search(&policydb->p_types, rulestr);
if (!typedatum)
goto out;
tmprule->au_ctxt.type = typedatum->value;

21
security/selinux/ss/symtab.c
View File

@ -9,7 +9,7 @@
#include <linux/errno.h>
#include "symtab.h"
static unsigned int symhash(struct hashtab *h, const void *key)
static unsigned int symhash(const void *key)
{
const char *p, *keyp;
unsigned int size;
@ -20,10 +20,10 @@ static unsigned int symhash(struct hashtab *h, const void *key)
size = strlen(keyp);
for (p = keyp; (p - keyp) < size; p++)
val = (val << 4 | (val >> (8*sizeof(unsigned int)-4))) ^ (*p);
return val & (h->size - 1);
return val;
}
static int symcmp(struct hashtab *h, const void *key1, const void *key2)
static int symcmp(const void *key1, const void *key2)
{
const char *keyp1, *keyp2;
@ -32,10 +32,23 @@ static int symcmp(struct hashtab *h, const void *key1, const void *key2)
return strcmp(keyp1, keyp2);
}
static const struct hashtab_key_params symtab_key_params = {
.hash = symhash,
.cmp = symcmp,
};
int symtab_init(struct symtab *s, unsigned int size)
{
s->nprim = 0;
return hashtab_init(&s->table, symhash, symcmp, size);
return hashtab_init(&s->table, size);
}
int symtab_insert(struct symtab *s, char *name, void *datum)
{
return hashtab_insert(&s->table, name, datum, symtab_key_params);
}
void *symtab_search(struct symtab *s, const char *name)
{
return hashtab_search(&s->table, name, symtab_key_params);
}

3
security/selinux/ss/symtab.h
View File

@ -19,6 +19,9 @@ struct symtab {
int symtab_init(struct symtab *s, unsigned int size);
int symtab_insert(struct symtab *s, char *name, void *datum);
void *symtab_search(struct symtab *s, const char *name);
#endif /* _SS_SYMTAB_H_ */