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WSL2-Linux-Kernel
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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/selinux-2.6 

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/selinux-2.6:
  SELinux: kills warnings in Improve SELinux performance when AVC misses
  SELinux: improve performance when AVC misses.
  SELinux: policy selectable handling of unknown classes and perms
  SELinux: Improve read/write performance
  SELinux: tune avtab to reduce memory usage
This commit is contained in:
Linus Torvalds 2007-10-16 16:53:20 -07:00
Родитель 1316ff5d52 087feb9804
Коммит b883a688ce
18 изменённых файлов: 580 добавлений и 282 удалений
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4
fs/open.c
Просмотреть файл

@ -757,6 +757,10 @@ static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
f->f_op = fops_get(inode->i_fop);
file_move(f, &inode->i_sb->s_files);
error = security_dentry_open(f);
if (error)
goto cleanup_all;
if (!open && f->f_op)
open = f->f_op->open;
if (open) {

18
include/linux/security.h
Просмотреть файл

@ -504,6 +504,13 @@ struct request_sock;
* @file contains the file structure being received.
* Return 0 if permission is granted.
*
* Security hook for dentry
*
* @dentry_open
* Save open-time permission checking state for later use upon
* file_permission, and recheck access if anything has changed
* since inode_permission.
*
* Security hooks for task operations.
*
* @task_create:
@ -1256,6 +1263,7 @@ struct security_operations {
int (*file_send_sigiotask) (struct task_struct * tsk,
struct fown_struct * fown, int sig);
int (*file_receive) (struct file * file);
int (*dentry_open) (struct file *file);
int (*task_create) (unsigned long clone_flags);
int (*task_alloc_security) (struct task_struct * p);
@ -1864,6 +1872,11 @@ static inline int security_file_receive (struct file *file)
return security_ops->file_receive (file);
}
static inline int security_dentry_open (struct file *file)
{
return security_ops->dentry_open (file);
}
static inline int security_task_create (unsigned long clone_flags)
{
return security_ops->task_create (clone_flags);
@ -2546,6 +2559,11 @@ static inline int security_file_receive (struct file *file)
return 0;
}
static inline int security_dentry_open (struct file *file)
{
return 0;
}
static inline int security_task_create (unsigned long clone_flags)
{
return 0;

6
security/dummy.c
Просмотреть файл

@ -463,6 +463,11 @@ static int dummy_file_receive (struct file *file)
return 0;
}
static int dummy_dentry_open (struct file *file)
{
return 0;
}
static int dummy_task_create (unsigned long clone_flags)
{
return 0;
@ -1033,6 +1038,7 @@ void security_fixup_ops (struct security_operations *ops)
set_to_dummy_if_null(ops, file_set_fowner);
set_to_dummy_if_null(ops, file_send_sigiotask);
set_to_dummy_if_null(ops, file_receive);
set_to_dummy_if_null(ops, dentry_open);
set_to_dummy_if_null(ops, task_create);
set_to_dummy_if_null(ops, task_alloc_security);
set_to_dummy_if_null(ops, task_free_security);

5
security/selinux/avc.c
Просмотреть файл

@ -916,3 +916,8 @@ int avc_has_perm(u32 ssid, u32 tsid, u16 tclass,
avc_audit(ssid, tsid, tclass, requested, &avd, rc, auditdata);
return rc;
}
u32 avc_policy_seqno(void)
{
return avc_cache.latest_notif;
}

53
security/selinux/hooks.c
Просмотреть файл

@ -14,6 +14,8 @@
* <dgoeddel@trustedcs.com>
* Copyright (C) 2006 Hewlett-Packard Development Company, L.P.
* Paul Moore, <paul.moore@hp.com>
* Copyright (C) 2007 Hitachi Software Engineering Co., Ltd.
* Yuichi Nakamura <ynakam@hitachisoft.jp>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2,
@ -2464,7 +2466,7 @@ static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t
/* file security operations */
static int selinux_file_permission(struct file *file, int mask)
static int selinux_revalidate_file_permission(struct file *file, int mask)
{
int rc;
struct inode *inode = file->f_path.dentry->d_inode;
@ -2486,6 +2488,25 @@ static int selinux_file_permission(struct file *file, int mask)
return selinux_netlbl_inode_permission(inode, mask);
}
static int selinux_file_permission(struct file *file, int mask)
{
struct inode *inode = file->f_path.dentry->d_inode;
struct task_security_struct *tsec = current->security;
struct file_security_struct *fsec = file->f_security;
struct inode_security_struct *isec = inode->i_security;
if (!mask) {
/* No permission to check. Existence test. */
return 0;
}
if (tsec->sid == fsec->sid && fsec->isid == isec->sid
&& fsec->pseqno == avc_policy_seqno())
return selinux_netlbl_inode_permission(inode, mask);
return selinux_revalidate_file_permission(file, mask);
}
static int selinux_file_alloc_security(struct file *file)
{
return file_alloc_security(file);
@ -2725,6 +2746,34 @@ static int selinux_file_receive(struct file *file)
return file_has_perm(current, file, file_to_av(file));
}
static int selinux_dentry_open(struct file *file)
{
struct file_security_struct *fsec;
struct inode *inode;
struct inode_security_struct *isec;
inode = file->f_path.dentry->d_inode;
fsec = file->f_security;
isec = inode->i_security;
/*
* Save inode label and policy sequence number
* at open-time so that selinux_file_permission
* can determine whether revalidation is necessary.
* Task label is already saved in the file security
* struct as its SID.
*/
fsec->isid = isec->sid;
fsec->pseqno = avc_policy_seqno();
/*
* Since the inode label or policy seqno may have changed
* between the selinux_inode_permission check and the saving
* of state above, recheck that access is still permitted.
* Otherwise, access might never be revalidated against the
* new inode label or new policy.
* This check is not redundant - do not remove.
*/
return inode_has_perm(current, inode, file_to_av(file), NULL);
}
/* task security operations */
static int selinux_task_create(unsigned long clone_flags)
@ -4794,6 +4843,8 @@ static struct security_operations selinux_ops = {
.file_send_sigiotask = selinux_file_send_sigiotask,
.file_receive = selinux_file_receive,
.dentry_open = selinux_dentry_open,
.task_create = selinux_task_create,
.task_alloc_security = selinux_task_alloc_security,
.task_free_security = selinux_task_free_security,

2
security/selinux/include/avc.h
Просмотреть файл

@ -112,6 +112,8 @@ int avc_has_perm(u32 ssid, u32 tsid,
u16 tclass, u32 requested,
struct avc_audit_data *auditdata);
u32 avc_policy_seqno(void);
#define AVC_CALLBACK_GRANT 1
#define AVC_CALLBACK_TRY_REVOKE 2
#define AVC_CALLBACK_REVOKE 4

2
security/selinux/include/objsec.h
Просмотреть файл

@ -53,6 +53,8 @@ struct file_security_struct {
struct file *file; /* back pointer to file object */
u32 sid; /* SID of open file description */
u32 fown_sid; /* SID of file owner (for SIGIO) */
u32 isid; /* SID of inode at the time of file open */
u32 pseqno; /* Policy seqno at the time of file open */
};
struct superblock_security_struct {

2
security/selinux/include/security.h
Просмотреть файл

@ -90,6 +90,8 @@ int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
int security_get_classes(char ***classes, int *nclasses);
int security_get_permissions(char *class, char ***perms, int *nperms);
int security_get_reject_unknown(void);
int security_get_allow_unknown(void);
#define SECURITY_FS_USE_XATTR 1 /* use xattr */
#define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */

26
security/selinux/selinuxfs.c
Просмотреть файл

@ -103,6 +103,8 @@ enum sel_inos {
SEL_MEMBER, /* compute polyinstantiation membership decision */
SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
SEL_COMPAT_NET, /* whether to use old compat network packet controls */
SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
SEL_INO_NEXT, /* The next inode number to use */
};
@ -177,6 +179,23 @@ static const struct file_operations sel_enforce_ops = {
.write = sel_write_enforce,
};
static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
size_t count, loff_t *ppos)
{
char tmpbuf[TMPBUFLEN];
ssize_t length;
ino_t ino = filp->f_path.dentry->d_inode->i_ino;
int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
security_get_reject_unknown() : !security_get_allow_unknown();
length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
}
static const struct file_operations sel_handle_unknown_ops = {
.read = sel_read_handle_unknown,
};
#ifdef CONFIG_SECURITY_SELINUX_DISABLE
static ssize_t sel_write_disable(struct file * file, const char __user * buf,
size_t count, loff_t *ppos)
@ -309,6 +328,11 @@ static ssize_t sel_write_load(struct file * file, const char __user * buf,
length = count;
out1:
printk(KERN_INFO "SELinux: policy loaded with handle_unknown=%s\n",
(security_get_reject_unknown() ? "reject" :
(security_get_allow_unknown() ? "allow" : "deny")));
audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
"policy loaded auid=%u",
audit_get_loginuid(current->audit_context));
@ -1575,6 +1599,8 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent)
[SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
[SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
[SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
[SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
[SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
/* last one */ {""}
};
ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);

91
security/selinux/ss/avtab.c
Просмотреть файл

@ -12,24 +12,25 @@
* 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.
*
* Updated: Yuichi Nakamura <ynakam@hitachisoft.jp>
* Tuned number of hash slots for avtab to reduce memory usage
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/errno.h>
#include "avtab.h"
#include "policydb.h"
#define AVTAB_HASH(keyp) \
((keyp->target_class + \
(keyp->target_type << 2) + \
(keyp->source_type << 9)) & \
AVTAB_HASH_MASK)
static struct kmem_cache *avtab_node_cachep;
static inline int avtab_hash(struct avtab_key *keyp, u16 mask)
{
return ((keyp->target_class + (keyp->target_type << 2) +
(keyp->source_type << 9)) & mask);
}
static struct avtab_node*
avtab_insert_node(struct avtab *h, int hvalue,
struct avtab_node * prev, struct avtab_node * cur,
@ -59,10 +60,10 @@ static int avtab_insert(struct avtab *h, struct avtab_key *key, struct avtab_dat
struct avtab_node *prev, *cur, *newnode;
u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD);
if (!h)
if (!h || !h->htable)
return -EINVAL;
hvalue = AVTAB_HASH(key);
hvalue = avtab_hash(key, h->mask);
for (prev = NULL, cur = h->htable[hvalue];
cur;
prev = cur, cur = cur->next) {
@ -100,9 +101,9 @@ avtab_insert_nonunique(struct avtab * h, struct avtab_key * key, struct avtab_da
struct avtab_node *prev, *cur, *newnode;
u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD);
if (!h)
if (!h || !h->htable)
return NULL;
hvalue = AVTAB_HASH(key);
hvalue = avtab_hash(key, h->mask);
for (prev = NULL, cur = h->htable[hvalue];
cur;
prev = cur, cur = cur->next) {
@ -132,10 +133,10 @@ struct avtab_datum *avtab_search(struct avtab *h, struct avtab_key *key)
struct avtab_node *cur;
u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD);
if (!h)
if (!h || !h->htable)
return NULL;
hvalue = AVTAB_HASH(key);
hvalue = avtab_hash(key, h->mask);
for (cur = h->htable[hvalue]; cur; cur = cur->next) {
if (key->source_type == cur->key.source_type &&
key->target_type == cur->key.target_type &&
@ -167,10 +168,10 @@ avtab_search_node(struct avtab *h, struct avtab_key *key)
struct avtab_node *cur;
u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD);
if (!h)
if (!h || !h->htable)
return NULL;
hvalue = AVTAB_HASH(key);
hvalue = avtab_hash(key, h->mask);
for (cur = h->htable[hvalue]; cur; cur = cur->next) {
if (key->source_type == cur->key.source_type &&
key->target_type == cur->key.target_type &&
@ -228,7 +229,7 @@ void avtab_destroy(struct avtab *h)
if (!h || !h->htable)
return;
for (i = 0; i < AVTAB_SIZE; i++) {
for (i = 0; i < h->nslot; i++) {
cur = h->htable[i];
while (cur != NULL) {
temp = cur;
@ -237,32 +238,63 @@ void avtab_destroy(struct avtab *h)
}
h->htable[i] = NULL;
}
vfree(h->htable);
kfree(h->htable);
h->htable = NULL;
h->nslot = 0;
h->mask = 0;
}
int avtab_init(struct avtab *h)
{
int i;
h->htable = NULL;
h->nel = 0;
return 0;
}
h->htable = vmalloc(sizeof(*(h->htable)) * AVTAB_SIZE);
int avtab_alloc(struct avtab *h, u32 nrules)
{
u16 mask = 0;
u32 shift = 0;
u32 work = nrules;
u32 nslot = 0;
if (nrules == 0)
goto avtab_alloc_out;
while (work) {
work = work >> 1;
shift++;
}
if (shift > 2)
shift = shift - 2;
nslot = 1 << shift;
if (nslot > MAX_AVTAB_SIZE)
nslot = MAX_AVTAB_SIZE;
mask = nslot - 1;
h->htable = kcalloc(nslot, sizeof(*(h->htable)), GFP_KERNEL);
if (!h->htable)
return -ENOMEM;
for (i = 0; i < AVTAB_SIZE; i++)
h->htable[i] = NULL;
avtab_alloc_out:
h->nel = 0;
h->nslot = nslot;
h->mask = mask;
printk(KERN_DEBUG "SELinux:%d avtab hash slots allocated."
"Num of rules:%d\n", h->nslot, nrules);
return 0;
}
void avtab_hash_eval(struct avtab *h, char *tag)
{
int i, chain_len, slots_used, max_chain_len;
unsigned long long chain2_len_sum;
struct avtab_node *cur;
slots_used = 0;
max_chain_len = 0;
for (i = 0; i < AVTAB_SIZE; i++) {
chain2_len_sum = 0;
for (i = 0; i < h->nslot; i++) {
cur = h->htable[i];
if (cur) {
slots_used++;
@ -274,12 +306,14 @@ void avtab_hash_eval(struct avtab *h, char *tag)
if (chain_len > max_chain_len)
max_chain_len = chain_len;
chain2_len_sum += chain_len * chain_len;
}
}
printk(KERN_DEBUG "%s: %d entries and %d/%d buckets used, longest "
"chain length %d\n", tag, h->nel, slots_used, AVTAB_SIZE,
max_chain_len);
"chain length %d sum of chain length^2 %Lu\n",
tag, h->nel, slots_used, h->nslot, max_chain_len,
chain2_len_sum);
}
static uint16_t spec_order[] = {
@ -419,6 +453,11 @@ int avtab_read(struct avtab *a, void *fp, u32 vers)
rc = -EINVAL;
goto bad;
}
rc = avtab_alloc(a, nel);
if (rc)
goto bad;
for (i = 0; i < nel; i++) {
rc = avtab_read_item(fp,vers, a, avtab_insertf, NULL);
if (rc) {

16
security/selinux/ss/avtab.h
Просмотреть файл

@ -16,6 +16,9 @@
* 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.
*
* Updated: Yuichi Nakamura <ynakam@hitachisoft.jp>
* Tuned number of hash slots for avtab to reduce memory usage
*/
#ifndef _SS_AVTAB_H_
#define _SS_AVTAB_H_
@ -50,9 +53,13 @@ struct avtab_node {
struct avtab {
struct avtab_node **htable;
u32 nel; /* number of elements */
u32 nslot; /* number of hash slots */
u16 mask; /* mask to compute hash func */
};
int avtab_init(struct avtab *);
int avtab_alloc(struct avtab *, u32);
struct avtab_datum *avtab_search(struct avtab *h, struct avtab_key *k);
void avtab_destroy(struct avtab *h);
void avtab_hash_eval(struct avtab *h, char *tag);
@ -74,11 +81,10 @@ struct avtab_node *avtab_search_node_next(struct avtab_node *node, int specified
void avtab_cache_init(void);
void avtab_cache_destroy(void);
#define AVTAB_HASH_BITS 15
#define AVTAB_HASH_BUCKETS (1 << AVTAB_HASH_BITS)
#define AVTAB_HASH_MASK (AVTAB_HASH_BUCKETS-1)
#define AVTAB_SIZE AVTAB_HASH_BUCKETS
#define MAX_AVTAB_HASH_BITS 13
#define MAX_AVTAB_HASH_BUCKETS (1 << MAX_AVTAB_HASH_BITS)
#define MAX_AVTAB_HASH_MASK (MAX_AVTAB_HASH_BUCKETS-1)
#define MAX_AVTAB_SIZE MAX_AVTAB_HASH_BUCKETS
#endif /* _SS_AVTAB_H_ */

4
security/selinux/ss/conditional.c
Просмотреть файл

@ -456,6 +456,10 @@ int cond_read_list(struct policydb *p, void *fp)
len = le32_to_cpu(buf[0]);
rc = avtab_alloc(&(p->te_cond_avtab), p->te_avtab.nel);
if (rc)
goto err;
for (i = 0; i < len; i++) {
node = kzalloc(sizeof(struct cond_node), GFP_KERNEL);
if (!node)

282
security/selinux/ss/ebitmap.c
Просмотреть файл

@ -10,6 +10,10 @@
*
* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
*/
/*
* Updated: KaiGai Kohei <kaigai@ak.jp.nec.com>
* Applied standard bit operations to improve bitmap scanning.
*/
#include <linux/kernel.h>
#include <linux/slab.h>
@ -29,7 +33,7 @@ int ebitmap_cmp(struct ebitmap *e1, struct ebitmap *e2)
n2 = e2->node;
while (n1 && n2 &&
(n1->startbit == n2->startbit) &&
(n1->map == n2->map)) {
!memcmp(n1->maps, n2->maps, EBITMAP_SIZE / 8)) {
n1 = n1->next;
n2 = n2->next;
}
@ -54,7 +58,7 @@ int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src)
return -ENOMEM;
}
new->startbit = n->startbit;
new->map = n->map;
memcpy(new->maps, n->maps, EBITMAP_SIZE / 8);
new->next = NULL;
if (prev)
prev->next = new;
@ -84,13 +88,15 @@ int ebitmap_netlbl_export(struct ebitmap *ebmap,
{
struct ebitmap_node *e_iter = ebmap->node;
struct netlbl_lsm_secattr_catmap *c_iter;
u32 cmap_idx;
u32 cmap_idx, cmap_sft;
int i;
/* This function is a much simpler because SELinux's MAPTYPE happens
* to be the same as NetLabel's NETLBL_CATMAP_MAPTYPE, if MAPTYPE is
* changed from a u64 this function will most likely need to be changed
* as well. It's not ideal but I think the tradeoff in terms of
* neatness and speed is worth it. */
/* NetLabel's NETLBL_CATMAP_MAPTYPE is defined as an array of u64,
* however, it is not always compatible with an array of unsigned long
* in ebitmap_node.
* In addition, you should pay attention the following implementation
* assumes unsigned long has a width equal with or less than 64-bit.
*/
if (e_iter == NULL) {
*catmap = NULL;
@ -104,19 +110,27 @@ int ebitmap_netlbl_export(struct ebitmap *ebmap,
c_iter->startbit = e_iter->startbit & ~(NETLBL_CATMAP_SIZE - 1);
while (e_iter != NULL) {
if (e_iter->startbit >=
(c_iter->startbit + NETLBL_CATMAP_SIZE)) {
c_iter->next = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
if (c_iter->next == NULL)
goto netlbl_export_failure;
c_iter = c_iter->next;
c_iter->startbit = e_iter->startbit &
~(NETLBL_CATMAP_SIZE - 1);
for (i = 0; i < EBITMAP_UNIT_NUMS; i++) {
unsigned int delta, e_startbit, c_endbit;
e_startbit = e_iter->startbit + i * EBITMAP_UNIT_SIZE;
c_endbit = c_iter->startbit + NETLBL_CATMAP_SIZE;
if (e_startbit >= c_endbit) {
c_iter->next
= netlbl_secattr_catmap_alloc(GFP_ATOMIC);
if (c_iter->next == NULL)
goto netlbl_export_failure;
c_iter = c_iter->next;
c_iter->startbit
= e_startbit & ~(NETLBL_CATMAP_SIZE - 1);
}
delta = e_startbit - c_iter->startbit;
cmap_idx = delta / NETLBL_CATMAP_MAPSIZE;
cmap_sft = delta % NETLBL_CATMAP_MAPSIZE;
c_iter->bitmap[cmap_idx]
|= e_iter->maps[cmap_idx] << cmap_sft;
e_iter = e_iter->next;
}
cmap_idx = (e_iter->startbit - c_iter->startbit) /
NETLBL_CATMAP_MAPSIZE;
c_iter->bitmap[cmap_idx] = e_iter->map;
e_iter = e_iter->next;
}
return 0;
@ -128,7 +142,7 @@ netlbl_export_failure:
/**
* ebitmap_netlbl_import - Import a NetLabel category bitmap into an ebitmap
* @ebmap: the ebitmap to export
* @ebmap: the ebitmap to import
* @catmap: the NetLabel category bitmap
*
* Description:
@ -142,36 +156,50 @@ int ebitmap_netlbl_import(struct ebitmap *ebmap,
struct ebitmap_node *e_iter = NULL;
struct ebitmap_node *emap_prev = NULL;
struct netlbl_lsm_secattr_catmap *c_iter = catmap;
u32 c_idx;
u32 c_idx, c_pos, e_idx, e_sft;
/* This function is a much simpler because SELinux's MAPTYPE happens
* to be the same as NetLabel's NETLBL_CATMAP_MAPTYPE, if MAPTYPE is
* changed from a u64 this function will most likely need to be changed
* as well. It's not ideal but I think the tradeoff in terms of
* neatness and speed is worth it. */
/* NetLabel's NETLBL_CATMAP_MAPTYPE is defined as an array of u64,
* however, it is not always compatible with an array of unsigned long
* in ebitmap_node.
* In addition, you should pay attention the following implementation
* assumes unsigned long has a width equal with or less than 64-bit.
*/
do {
for (c_idx = 0; c_idx < NETLBL_CATMAP_MAPCNT; c_idx++) {
if (c_iter->bitmap[c_idx] == 0)
unsigned int delta;
u64 map = c_iter->bitmap[c_idx];
if (!map)
continue;
e_iter = kzalloc(sizeof(*e_iter), GFP_ATOMIC);
if (e_iter == NULL)
goto netlbl_import_failure;
if (emap_prev == NULL)
ebmap->node = e_iter;
else
emap_prev->next = e_iter;
emap_prev = e_iter;
e_iter->startbit = c_iter->startbit +
NETLBL_CATMAP_MAPSIZE * c_idx;
e_iter->map = c_iter->bitmap[c_idx];
c_pos = c_iter->startbit
+ c_idx * NETLBL_CATMAP_MAPSIZE;
if (!e_iter
|| c_pos >= e_iter->startbit + EBITMAP_SIZE) {
e_iter = kzalloc(sizeof(*e_iter), GFP_ATOMIC);
if (!e_iter)
goto netlbl_import_failure;
e_iter->startbit
= c_pos - (c_pos % EBITMAP_SIZE);
if (emap_prev == NULL)
ebmap->node = e_iter;
else
emap_prev->next = e_iter;
emap_prev = e_iter;
}
delta = c_pos - e_iter->startbit;
e_idx = delta / EBITMAP_UNIT_SIZE;
e_sft = delta % EBITMAP_UNIT_SIZE;
while (map) {
e_iter->maps[e_idx++] |= map & (-1UL);
map = EBITMAP_SHIFT_UNIT_SIZE(map);
}
}
c_iter = c_iter->next;
} while (c_iter != NULL);
if (e_iter != NULL)
ebmap->highbit = e_iter->startbit + MAPSIZE;
ebmap->highbit = e_iter->startbit + EBITMAP_SIZE;
else
ebitmap_destroy(ebmap);
@ -186,6 +214,7 @@ netlbl_import_failure:
int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2)
{
struct ebitmap_node *n1, *n2;
int i;
if (e1->highbit < e2->highbit)
return 0;
@ -197,8 +226,10 @@ int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2)
n1 = n1->next;
continue;
}
if ((n1->map & n2->map) != n2->map)
return 0;
for (i = 0; i < EBITMAP_UNIT_NUMS; i++) {
if ((n1->maps[i] & n2->maps[i]) != n2->maps[i])
return 0;
}
n1 = n1->next;
n2 = n2->next;
@ -219,12 +250,8 @@ int ebitmap_get_bit(struct ebitmap *e, unsigned long bit)
n = e->node;
while (n && (n->startbit <= bit)) {
if ((n->startbit + MAPSIZE) > bit) {
if (n->map & (MAPBIT << (bit - n->startbit)))
return 1;
else
return 0;
}
if ((n->startbit + EBITMAP_SIZE) > bit)
return ebitmap_node_get_bit(n, bit);
n = n->next;
}
@ -238,31 +265,35 @@ int ebitmap_set_bit(struct ebitmap *e, unsigned long bit, int value)
prev = NULL;
n = e->node;
while (n && n->startbit <= bit) {
if ((n->startbit + MAPSIZE) > bit) {
if ((n->startbit + EBITMAP_SIZE) > bit) {
if (value) {
n->map |= (MAPBIT << (bit - n->startbit));
ebitmap_node_set_bit(n, bit);
} else {
n->map &= ~(MAPBIT << (bit - n->startbit));
if (!n->map) {
/* drop this node from the bitmap */
unsigned int s;
if (!n->next) {
/*
* this was the highest map
* within the bitmap
*/
if (prev)
e->highbit = prev->startbit + MAPSIZE;
else
e->highbit = 0;
}
ebitmap_node_clr_bit(n, bit);
s = find_first_bit(n->maps, EBITMAP_SIZE);
if (s < EBITMAP_SIZE)
return 0;
/* drop this node from the bitmap */
if (!n->next) {
/*
* this was the highest map
* within the bitmap
*/
if (prev)
prev->next = n->next;
e->highbit = prev->startbit
+ EBITMAP_SIZE;
else
e->node = n->next;
kfree(n);
e->highbit = 0;
}
if (prev)
prev->next = n->next;
else
e->node = n->next;
kfree(n);
}
return 0;
}
@ -277,12 +308,12 @@ int ebitmap_set_bit(struct ebitmap *e, unsigned long bit, int value)
if (!new)
return -ENOMEM;
new->startbit = bit & ~(MAPSIZE - 1);
new->map = (MAPBIT << (bit - new->startbit));
new->startbit = bit - (bit % EBITMAP_SIZE);
ebitmap_node_set_bit(new, bit);
if (!n)
/* this node will be the highest map within the bitmap */
e->highbit = new->startbit + MAPSIZE;
e->highbit = new->startbit + EBITMAP_SIZE;
if (prev) {
new->next = prev->next;
@ -316,11 +347,11 @@ void ebitmap_destroy(struct ebitmap *e)
int ebitmap_read(struct ebitmap *e, void *fp)
{
int rc;
struct ebitmap_node *n, *l;
struct ebitmap_node *n = NULL;
u32 mapunit, count, startbit, index;
u64 map;
__le32 buf[3];
u32 mapsize, count, i;
__le64 map;
int rc, i;
ebitmap_init(e);
@ -328,85 +359,88 @@ int ebitmap_read(struct ebitmap *e, void *fp)
if (rc < 0)
goto out;
mapsize = le32_to_cpu(buf[0]);
mapunit = le32_to_cpu(buf[0]);
e->highbit = le32_to_cpu(buf[1]);
count = le32_to_cpu(buf[2]);
if (mapsize != MAPSIZE) {
if (mapunit != sizeof(u64) * 8) {
printk(KERN_ERR "security: ebitmap: map size %u does not "
"match my size %Zd (high bit was %d)\n", mapsize,
MAPSIZE, e->highbit);
"match my size %Zd (high bit was %d)\n",
mapunit, sizeof(u64) * 8, e->highbit);
goto bad;
}
/* round up e->highbit */
e->highbit += EBITMAP_SIZE - 1;
e->highbit -= (e->highbit % EBITMAP_SIZE);
if (!e->highbit) {
e->node = NULL;
goto ok;
}
if (e->highbit & (MAPSIZE - 1)) {
printk(KERN_ERR "security: ebitmap: high bit (%d) is not a "
"multiple of the map size (%Zd)\n", e->highbit, MAPSIZE);
goto bad;
}
l = NULL;
for (i = 0; i < count; i++) {
rc = next_entry(buf, fp, sizeof(u32));
rc = next_entry(&startbit, fp, sizeof(u32));
if (rc < 0) {
printk(KERN_ERR "security: ebitmap: truncated map\n");
goto bad;
}
n = kzalloc(sizeof(*n), GFP_KERNEL);
if (!n) {
printk(KERN_ERR "security: ebitmap: out of memory\n");
rc = -ENOMEM;
startbit = le32_to_cpu(startbit);
if (startbit & (mapunit - 1)) {
printk(KERN_ERR "security: ebitmap start bit (%d) is "
"not a multiple of the map unit size (%u)\n",
startbit, mapunit);
goto bad;
}
if (startbit > e->highbit - mapunit) {
printk(KERN_ERR "security: ebitmap start bit (%d) is "
"beyond the end of the bitmap (%u)\n",
startbit, (e->highbit - mapunit));
goto bad;
}
n->startbit = le32_to_cpu(buf[0]);
if (!n || startbit >= n->startbit + EBITMAP_SIZE) {
struct ebitmap_node *tmp;
tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
if (!tmp) {
printk(KERN_ERR
"security: ebitmap: out of memory\n");
rc = -ENOMEM;
goto bad;
}
/* round down */
tmp->startbit = startbit - (startbit % EBITMAP_SIZE);
if (n) {
n->next = tmp;
} else {
e->node = tmp;
}
n = tmp;
} else if (startbit <= n->startbit) {
printk(KERN_ERR "security: ebitmap: start bit %d"
" comes after start bit %d\n",
startbit, n->startbit);
goto bad;
}
if (n->startbit & (MAPSIZE - 1)) {
printk(KERN_ERR "security: ebitmap start bit (%d) is "
"not a multiple of the map size (%Zd)\n",
n->startbit, MAPSIZE);
goto bad_free;
}
if (n->startbit > (e->highbit - MAPSIZE)) {
printk(KERN_ERR "security: ebitmap start bit (%d) is "
"beyond the end of the bitmap (%Zd)\n",
n->startbit, (e->highbit - MAPSIZE));
goto bad_free;
}
rc = next_entry(&map, fp, sizeof(u64));
if (rc < 0) {
printk(KERN_ERR "security: ebitmap: truncated map\n");
goto bad_free;
goto bad;
}
n->map = le64_to_cpu(map);
map = le64_to_cpu(map);
if (!n->map) {
printk(KERN_ERR "security: ebitmap: null map in "
"ebitmap (startbit %d)\n", n->startbit);
goto bad_free;
index = (startbit - n->startbit) / EBITMAP_UNIT_SIZE;
while (map) {
n->maps[index++] = map & (-1UL);
map = EBITMAP_SHIFT_UNIT_SIZE(map);
}
if (l) {
if (n->startbit <= l->startbit) {
printk(KERN_ERR "security: ebitmap: start "
"bit %d comes after start bit %d\n",
n->startbit, l->startbit);
goto bad_free;
}
l->next = n;
} else
e->node = n;
l = n;
}
ok:
rc = 0;
out:
return rc;
bad_free:
kfree(n);
bad:
if (!rc)
rc = -EINVAL;

89
security/selinux/ss/ebitmap.h
Просмотреть файл

@ -16,14 +16,18 @@
#include <net/netlabel.h>
#define MAPTYPE u64 /* portion of bitmap in each node */
#define MAPSIZE (sizeof(MAPTYPE) * 8) /* number of bits in node bitmap */
#define MAPBIT 1ULL /* a bit in the node bitmap */
#define EBITMAP_UNIT_NUMS ((32 - sizeof(void *) - sizeof(u32)) \
/ sizeof(unsigned long))
#define EBITMAP_UNIT_SIZE BITS_PER_LONG
#define EBITMAP_SIZE (EBITMAP_UNIT_NUMS * EBITMAP_UNIT_SIZE)
#define EBITMAP_BIT 1ULL
#define EBITMAP_SHIFT_UNIT_SIZE(x) \
(((x) >> EBITMAP_UNIT_SIZE / 2) >> EBITMAP_UNIT_SIZE / 2)
struct ebitmap_node {
u32 startbit; /* starting position in the total bitmap */
MAPTYPE map; /* this node's portion of the bitmap */
struct ebitmap_node *next;
unsigned long maps[EBITMAP_UNIT_NUMS];
u32 startbit;
};
struct ebitmap {
@ -34,11 +38,17 @@ struct ebitmap {
#define ebitmap_length(e) ((e)->highbit)
#define ebitmap_startbit(e) ((e)->node ? (e)->node->startbit : 0)
static inline unsigned int ebitmap_start(struct ebitmap *e,
struct ebitmap_node **n)
static inline unsigned int ebitmap_start_positive(struct ebitmap *e,
struct ebitmap_node **n)
{
*n = e->node;
return ebitmap_startbit(e);
unsigned int ofs;
for (*n = e->node; *n; *n = (*n)->next) {
ofs = find_first_bit((*n)->maps, EBITMAP_SIZE);
if (ofs < EBITMAP_SIZE)
return (*n)->startbit + ofs;
}
return ebitmap_length(e);
}
static inline void ebitmap_init(struct ebitmap *e)
@ -46,28 +56,65 @@ static inline void ebitmap_init(struct ebitmap *e)
memset(e, 0, sizeof(*e));
}
static inline unsigned int ebitmap_next(struct ebitmap_node **n,
unsigned int bit)
static inline unsigned int ebitmap_next_positive(struct ebitmap *e,
struct ebitmap_node **n,
unsigned int bit)
{
if ((bit == ((*n)->startbit + MAPSIZE - 1)) &&
(*n)->next) {
*n = (*n)->next;
return (*n)->startbit;
}
unsigned int ofs;
return (bit+1);
ofs = find_next_bit((*n)->maps, EBITMAP_SIZE, bit - (*n)->startbit + 1);
if (ofs < EBITMAP_SIZE)
return ofs + (*n)->startbit;
for (*n = (*n)->next; *n; *n = (*n)->next) {
ofs = find_first_bit((*n)->maps, EBITMAP_SIZE);
if (ofs < EBITMAP_SIZE)
return ofs + (*n)->startbit;
}
return ebitmap_length(e);
}
static inline int ebitmap_node_get_bit(struct ebitmap_node * n,
#define EBITMAP_NODE_INDEX(node, bit) \
(((bit) - (node)->startbit) / EBITMAP_UNIT_SIZE)
#define EBITMAP_NODE_OFFSET(node, bit) \
(((bit) - (node)->startbit) % EBITMAP_UNIT_SIZE)
static inline int ebitmap_node_get_bit(struct ebitmap_node *n,
unsigned int bit)
{
if (n->map & (MAPBIT << (bit - n->startbit)))
unsigned int index = EBITMAP_NODE_INDEX(n, bit);
unsigned int ofs = EBITMAP_NODE_OFFSET(n, bit);
BUG_ON(index >= EBITMAP_UNIT_NUMS);
if ((n->maps[index] & (EBITMAP_BIT << ofs)))
return 1;
return 0;
}
#define ebitmap_for_each_bit(e, n, bit) \
for (bit = ebitmap_start(e, &n); bit < ebitmap_length(e); bit = ebitmap_next(&n, bit)) \
static inline void ebitmap_node_set_bit(struct ebitmap_node *n,
unsigned int bit)
{
unsigned int index = EBITMAP_NODE_INDEX(n, bit);
unsigned int ofs = EBITMAP_NODE_OFFSET(n, bit);
BUG_ON(index >= EBITMAP_UNIT_NUMS);
n->maps[index] |= (EBITMAP_BIT << ofs);
}
static inline void ebitmap_node_clr_bit(struct ebitmap_node *n,
unsigned int bit)
{
unsigned int index = EBITMAP_NODE_INDEX(n, bit);
unsigned int ofs = EBITMAP_NODE_OFFSET(n, bit);
BUG_ON(index >= EBITMAP_UNIT_NUMS);
n->maps[index] &= ~(EBITMAP_BIT << ofs);
}
#define ebitmap_for_each_positive_bit(e, n, bit) \
for (bit = ebitmap_start_positive(e, &n); \
bit < ebitmap_length(e); \
bit = ebitmap_next_positive(e, &n, bit)) \
int ebitmap_cmp(struct ebitmap *e1, struct ebitmap *e2);
int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src);

152
security/selinux/ss/mls.c
Просмотреть файл

@ -34,7 +34,9 @@
*/
int mls_compute_context_len(struct context * context)
{
int i, l, len, range;
int i, l, len, head, prev;
char *nm;
struct ebitmap *e;
struct ebitmap_node *node;
if (!selinux_mls_enabled)
@ -42,31 +44,33 @@ int mls_compute_context_len(struct context * context)
len = 1; /* for the beginning ":" */
for (l = 0; l < 2; l++) {
range = 0;
len += strlen(policydb.p_sens_val_to_name[context->range.level[l].sens - 1]);
int index_sens = context->range.level[l].sens;
len += strlen(policydb.p_sens_val_to_name[index_sens - 1]);
ebitmap_for_each_bit(&context->range.level[l].cat, node, i) {
if (ebitmap_node_get_bit(node, i)) {
if (range) {
range++;
continue;
/* categories */
head = -2;
prev = -2;
e = &context->range.level[l].cat;
ebitmap_for_each_positive_bit(e, node, i) {
if (i - prev > 1) {
/* one or more negative bits are skipped */
if (head != prev) {
nm = policydb.p_cat_val_to_name[prev];
len += strlen(nm) + 1;
}
len += strlen(policydb.p_cat_val_to_name[i]) + 1;
range++;
} else {
if (range > 1)
len += strlen(policydb.p_cat_val_to_name[i - 1]) + 1;
range = 0;
nm = policydb.p_cat_val_to_name[i];
len += strlen(nm) + 1;
head = i;
}
prev = i;
}
if (prev != head) {
nm = policydb.p_cat_val_to_name[prev];
len += strlen(nm) + 1;
}
/* Handle case where last category is the end of range */
if (range > 1)
len += strlen(policydb.p_cat_val_to_name[i - 1]) + 1;
if (l == 0) {
if (mls_level_eq(&context->range.level[0],
&context->range.level[1]))
&context->range.level[1]))
break;
else
len++;
@ -84,8 +88,9 @@ int mls_compute_context_len(struct context * context)
void mls_sid_to_context(struct context *context,
char **scontext)
{
char *scontextp;
int i, l, range, wrote_sep;
char *scontextp, *nm;
int i, l, head, prev;
struct ebitmap *e;
struct ebitmap_node *node;
if (!selinux_mls_enabled)
@ -97,61 +102,54 @@ void mls_sid_to_context(struct context *context,
scontextp++;
for (l = 0; l < 2; l++) {
range = 0;
wrote_sep = 0;
strcpy(scontextp,
policydb.p_sens_val_to_name[context->range.level[l].sens - 1]);
scontextp += strlen(policydb.p_sens_val_to_name[context->range.level[l].sens - 1]);
scontextp += strlen(scontextp);
/* categories */
ebitmap_for_each_bit(&context->range.level[l].cat, node, i) {
if (ebitmap_node_get_bit(node, i)) {
if (range) {
range++;
continue;
}
if (!wrote_sep) {
*scontextp++ = ':';
wrote_sep = 1;
} else
*scontextp++ = ',';
strcpy(scontextp, policydb.p_cat_val_to_name[i]);
scontextp += strlen(policydb.p_cat_val_to_name[i]);
range++;
} else {
if (range > 1) {
if (range > 2)
head = -2;
prev = -2;
e = &context->range.level[l].cat;
ebitmap_for_each_positive_bit(e, node, i) {
if (i - prev > 1) {
/* one or more negative bits are skipped */
if (prev != head) {
if (prev - head > 1)
*scontextp++ = '.';
else
*scontextp++ = ',';
strcpy(scontextp, policydb.p_cat_val_to_name[i - 1]);
scontextp += strlen(policydb.p_cat_val_to_name[i - 1]);
nm = policydb.p_cat_val_to_name[prev];
strcpy(scontextp, nm);
scontextp += strlen(nm);
}
range = 0;
if (prev < 0)
*scontextp++ = ':';
else
*scontextp++ = ',';
nm = policydb.p_cat_val_to_name[i];
strcpy(scontextp, nm);
scontextp += strlen(nm);
head = i;
}
prev = i;
}
/* Handle case where last category is the end of range */
if (range > 1) {
if (range > 2)
if (prev != head) {
if (prev - head > 1)
*scontextp++ = '.';
else
*scontextp++ = ',';
strcpy(scontextp, policydb.p_cat_val_to_name[i - 1]);
scontextp += strlen(policydb.p_cat_val_to_name[i - 1]);
nm = policydb.p_cat_val_to_name[prev];
strcpy(scontextp, nm);
scontextp += strlen(nm);
}
if (l == 0) {
if (mls_level_eq(&context->range.level[0],
&context->range.level[1]))
break;
else {
*scontextp = '-';
scontextp++;
}
else
*scontextp++ = '-';
}
}
@ -190,17 +188,15 @@ int mls_context_isvalid(struct policydb *p, struct context *c)
if (!levdatum)
return 0;
ebitmap_for_each_bit(&c->range.level[l].cat, node, i) {
if (ebitmap_node_get_bit(node, i)) {
if (i > p->p_cats.nprim)
return 0;
if (!ebitmap_get_bit(&levdatum->level->cat, i))
/*
* Category may not be associated with
* sensitivity in low level.
*/
return 0;
}
ebitmap_for_each_positive_bit(&c->range.level[l].cat, node, i) {
if (i > p->p_cats.nprim)
return 0;
if (!ebitmap_get_bit(&levdatum->level->cat, i))
/*
* Category may not be associated with
* sensitivity in low level.
*/
return 0;
}
}
@ -485,18 +481,16 @@ int mls_convert_context(struct policydb *oldp,
c->range.level[l].sens = levdatum->level->sens;
ebitmap_init(&bitmap);
ebitmap_for_each_bit(&c->range.level[l].cat, node, i) {
if (ebitmap_node_get_bit(node, i)) {
int rc;
ebitmap_for_each_positive_bit(&c->range.level[l].cat, node, i) {
int rc;
catdatum = hashtab_search(newp->p_cats.table,
oldp->p_cat_val_to_name[i]);
if (!catdatum)
return -EINVAL;
rc = ebitmap_set_bit(&bitmap, catdatum->value - 1, 1);
if (rc)
return rc;
}
catdatum = hashtab_search(newp->p_cats.table,
oldp->p_cat_val_to_name[i]);
if (!catdatum)
return -EINVAL;
rc = ebitmap_set_bit(&bitmap, catdatum->value - 1, 1);
if (rc)
return rc;
}
ebitmap_destroy(&c->range.level[l].cat);
c->range.level[l].cat = bitmap;

11
security/selinux/ss/policydb.c
Просмотреть файл

@ -177,18 +177,15 @@ static int policydb_init(struct policydb *p)
rc = roles_init(p);
if (rc)
goto out_free_avtab;
goto out_free_symtab;
rc = cond_policydb_init(p);
if (rc)
goto out_free_avtab;
goto out_free_symtab;
out:
return rc;
out_free_avtab:
avtab_destroy(&p->te_avtab);
out_free_symtab:
for (i = 0; i < SYM_NUM; i++)
hashtab_destroy(p->symtab[i].table);
@ -677,6 +674,8 @@ void policydb_destroy(struct policydb *p)
}
kfree(p->type_attr_map);
kfree(p->undefined_perms);
return;
}
@ -1530,6 +1529,8 @@ int policydb_read(struct policydb *p, void *fp)
goto bad;
}
}
p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
info = policydb_lookup_compat(p->policyvers);
if (!info) {

8
security/selinux/ss/policydb.h
Просмотреть файл

@ -242,6 +242,10 @@ struct policydb {
struct ebitmap *type_attr_map;
unsigned int policyvers;
unsigned int reject_unknown : 1;
unsigned int allow_unknown : 1;
u32 *undefined_perms;
};
extern void policydb_destroy(struct policydb *p);
@ -253,6 +257,10 @@ extern int policydb_read(struct policydb *p, void *fp);
#define POLICYDB_CONFIG_MLS 1
/* the config flags related to unknown classes/perms are bits 2 and 3 */
#define REJECT_UNKNOWN 0x00000002
#define ALLOW_UNKNOWN 0x00000004
#define OBJECT_R "object_r"
#define OBJECT_R_VAL 1

91
security/selinux/ss/services.c
Просмотреть файл

@ -292,6 +292,7 @@ static int context_struct_compute_av(struct context *scontext,
struct class_datum *tclass_datum;
struct ebitmap *sattr, *tattr;
struct ebitmap_node *snode, *tnode;
const struct selinux_class_perm *kdefs = &selinux_class_perm;
unsigned int i, j;
/*
@ -305,13 +306,6 @@ static int context_struct_compute_av(struct context *scontext,
tclass <= SECCLASS_NETLINK_DNRT_SOCKET)
tclass = SECCLASS_NETLINK_SOCKET;
if (!tclass || tclass > policydb.p_classes.nprim) {
printk(KERN_ERR "security_compute_av: unrecognized class %d\n",
tclass);
return -EINVAL;
}
tclass_datum = policydb.class_val_to_struct[tclass - 1];
/*
* Initialize the access vectors to the default values.
*/
@ -321,6 +315,36 @@ static int context_struct_compute_av(struct context *scontext,
avd->auditdeny = 0xffffffff;
avd->seqno = latest_granting;
/*
* Check for all the invalid cases.
* - tclass 0
* - tclass > policy and > kernel
* - tclass > policy but is a userspace class
* - tclass > policy but we do not allow unknowns
*/
if (unlikely(!tclass))
goto inval_class;
if (unlikely(tclass > policydb.p_classes.nprim))
if (tclass > kdefs->cts_len ||
!kdefs->class_to_string[tclass - 1] ||
!policydb.allow_unknown)
goto inval_class;
/*
* Kernel class and we allow unknown so pad the allow decision
* the pad will be all 1 for unknown classes.
*/
if (tclass <= kdefs->cts_len && policydb.allow_unknown)
avd->allowed = policydb.undefined_perms[tclass - 1];
/*
* Not in policy. Since decision is completed (all 1 or all 0) return.
*/
if (unlikely(tclass > policydb.p_classes.nprim))
return 0;
tclass_datum = policydb.class_val_to_struct[tclass - 1];
/*
* If a specific type enforcement rule was defined for
* this permission check, then use it.
@ -329,12 +353,8 @@ static int context_struct_compute_av(struct context *scontext,
avkey.specified = AVTAB_AV;
sattr = &policydb.type_attr_map[scontext->type - 1];
tattr = &policydb.type_attr_map[tcontext->type - 1];
ebitmap_for_each_bit(sattr, snode, i) {
if (!ebitmap_node_get_bit(snode, i))
continue;
ebitmap_for_each_bit(tattr, tnode, j) {
if (!ebitmap_node_get_bit(tnode, j))
continue;
ebitmap_for_each_positive_bit(sattr, snode, i) {
ebitmap_for_each_positive_bit(tattr, tnode, j) {
avkey.source_type = i + 1;
avkey.target_type = j + 1;
for (node = avtab_search_node(&policydb.te_avtab, &avkey);
@ -387,6 +407,10 @@ static int context_struct_compute_av(struct context *scontext,
}
return 0;
inval_class:
printk(KERN_ERR "%s: unrecognized class %d\n", __FUNCTION__, tclass);
return -EINVAL;
}
static int security_validtrans_handle_fail(struct context *ocontext,
@ -1054,6 +1078,13 @@ static int validate_classes(struct policydb *p)
const char *def_class, *def_perm, *pol_class;
struct symtab *perms;
if (p->allow_unknown) {
u32 num_classes = kdefs->cts_len;
p->undefined_perms = kcalloc(num_classes, sizeof(u32), GFP_KERNEL);
if (!p->undefined_perms)
return -ENOMEM;
}
for (i = 1; i < kdefs->cts_len; i++) {
def_class = kdefs->class_to_string[i];
if (!def_class)
@ -1062,6 +1093,10 @@ static int validate_classes(struct policydb *p)
printk(KERN_INFO
"security: class %s not defined in policy\n",
def_class);
if (p->reject_unknown)
return -EINVAL;
if (p->allow_unknown)
p->undefined_perms[i-1] = ~0U;
continue;
}
pol_class = p->p_class_val_to_name[i-1];
@ -1087,12 +1122,16 @@ static int validate_classes(struct policydb *p)
printk(KERN_INFO
"security: permission %s in class %s not defined in policy\n",
def_perm, pol_class);
if (p->reject_unknown)
return -EINVAL;
if (p->allow_unknown)
p->undefined_perms[class_val-1] |= perm_val;
continue;
}
perdatum = hashtab_search(perms->table, def_perm);
if (perdatum == NULL) {
printk(KERN_ERR
"security: permission %s in class %s not found in policy\n",
"security: permission %s in class %s not found in policy, bad policy\n",
def_perm, pol_class);
return -EINVAL;
}
@ -1130,12 +1169,16 @@ static int validate_classes(struct policydb *p)
printk(KERN_INFO
"security: permission %s in class %s not defined in policy\n",
def_perm, pol_class);
if (p->reject_unknown)
return -EINVAL;
if (p->allow_unknown)
p->undefined_perms[class_val-1] |= (1 << j);
continue;
}
perdatum = hashtab_search(perms->table, def_perm);
if (perdatum == NULL) {
printk(KERN_ERR
"security: permission %s in class %s not found in policy\n",
"security: permission %s in class %s not found in policy, bad policy\n",
def_perm, pol_class);
return -EINVAL;
}
@ -1621,14 +1664,10 @@ int security_get_user_sids(u32 fromsid,
goto out_unlock;
}
ebitmap_for_each_bit(&user->roles, rnode, i) {
if (!ebitmap_node_get_bit(rnode, i))
continue;
ebitmap_for_each_positive_bit(&user->roles, rnode, i) {
role = policydb.role_val_to_struct[i];
usercon.role = i+1;
ebitmap_for_each_bit(&role->types, tnode, j) {
if (!ebitmap_node_get_bit(tnode, j))
continue;
ebitmap_for_each_positive_bit(&role->types, tnode, j) {
usercon.type = j+1;
if (mls_setup_user_range(fromcon, user, &usercon))
@ -2102,6 +2141,16 @@ err:
return rc;
}
int security_get_reject_unknown(void)
{
return policydb.reject_unknown;
}
int security_get_allow_unknown(void)
{
return policydb.allow_unknown;
}
struct selinux_audit_rule {
u32 au_seqno;
struct context au_ctxt;