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

Browse source 
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/selinux-2.6:
  security: unexport mmap_min_addr
  SELinux: use SECINITSID_NETMSG instead of SECINITSID_UNLABELED for NetLabel
  security: Protection for exploiting null dereference using mmap
  SELinux: Use %lu for inode->i_no when printing avc
  SELinux: allow preemption between transition permission checks
  selinux: introduce schedule points in policydb_destroy()
  selinux: add selinuxfs structure for object class discovery
  selinux: change sel_make_dir() to specify inode counter.
  selinux: rename sel_remove_bools() for more general usage.
  selinux: add support for querying object classes and permissions from the running policy
This commit is contained in:
Linus Torvalds 2007-07-12 13:46:48 -07:00
commit bb50cbbd4b
20 changed files with 504 additions and 86 deletions
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15
Documentation/sysctl/vm.txt
View file

@ -31,6 +31,7 @@ Currently, these files are in /proc/sys/vm:
- min_unmapped_ratio
- min_slab_ratio
- panic_on_oom
- mmap_min_address
==============================================================
@ -216,3 +217,17 @@ above-mentioned.
The default value is 0.
1 and 2 are for failover of clustering. Please select either
according to your policy of failover.
==============================================================
mmap_min_addr
This file indicates the amount of address space which a user process will
be restricted from mmaping. Since kernel null dereference bugs could
accidentally operate based on the information in the first couple of pages
of memory userspace processes should not be allowed to write to them. By
default this value is set to 0 and no protections will be enforced by the
security module. Setting this value to something like 64k will allow the
vast majority of applications to work correctly and provide defense in depth
against future potential kernel bugs.

17
include/linux/security.h
View file

@ -71,6 +71,7 @@ struct xfrm_user_sec_ctx;
extern int cap_netlink_send(struct sock *sk, struct sk_buff *skb);
extern int cap_netlink_recv(struct sk_buff *skb, int cap);
extern unsigned long mmap_min_addr;
/*
* Values used in the task_security_ops calls
*/
@ -1241,8 +1242,9 @@ struct security_operations {
int (*file_ioctl) (struct file * file, unsigned int cmd,
unsigned long arg);
int (*file_mmap) (struct file * file,
unsigned long reqprot,
unsigned long prot, unsigned long flags);
unsigned long reqprot, unsigned long prot,
unsigned long flags, unsigned long addr,
unsigned long addr_only);
int (*file_mprotect) (struct vm_area_struct * vma,
unsigned long reqprot,
unsigned long prot);
@ -1814,9 +1816,12 @@ static inline int security_file_ioctl (struct file *file, unsigned int cmd,
static inline int security_file_mmap (struct file *file, unsigned long reqprot,
unsigned long prot,
unsigned long flags)
unsigned long flags,
unsigned long addr,
unsigned long addr_only)
{
return security_ops->file_mmap (file, reqprot, prot, flags);
return security_ops->file_mmap (file, reqprot, prot, flags, addr,
addr_only);
}
static inline int security_file_mprotect (struct vm_area_struct *vma,
@ -2489,7 +2494,9 @@ static inline int security_file_ioctl (struct file *file, unsigned int cmd,
static inline int security_file_mmap (struct file *file, unsigned long reqprot,
unsigned long prot,
unsigned long flags)
unsigned long flags,
unsigned long addr,
unsigned long addr_only)
{
return 0;
}

10
kernel/sysctl.c
View file

@ -949,6 +949,16 @@ static ctl_table vm_table[] = {
.strategy = &sysctl_jiffies,
},
#endif
#ifdef CONFIG_SECURITY
{
.ctl_name = CTL_UNNUMBERED,
.procname = "mmap_min_addr",
.data = &mmap_min_addr,
.maxlen = sizeof(unsigned long),
.mode = 0644,
.proc_handler = &proc_doulongvec_minmax,
},
#endif
#if defined(CONFIG_X86_32) || \
(defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
{

2
mm/mmap.c
View file

@ -1023,7 +1023,7 @@ unsigned long do_mmap_pgoff(struct file * file, unsigned long addr,
}
}
error = security_file_mmap(file, reqprot, prot, flags);
error = security_file_mmap(file, reqprot, prot, flags, addr, 0);
if (error)
return error;

13
mm/mremap.c
View file

@ -291,6 +291,10 @@ unsigned long do_mremap(unsigned long addr,
if ((addr <= new_addr) && (addr+old_len) > new_addr)
goto out;
ret = security_file_mmap(0, 0, 0, 0, new_addr, 1);
if (ret)
goto out;
ret = do_munmap(mm, new_addr, new_len);
if (ret)
goto out;
@ -390,8 +394,13 @@ unsigned long do_mremap(unsigned long addr,
new_addr = get_unmapped_area(vma->vm_file, 0, new_len,
vma->vm_pgoff, map_flags);
ret = new_addr;
if (new_addr & ~PAGE_MASK)
if (new_addr & ~PAGE_MASK) {
ret = new_addr;
goto out;
}
ret = security_file_mmap(0, 0, 0, 0, new_addr, 1);
if (ret)
goto out;
}
ret = move_vma(vma, addr, old_len, new_len, new_addr);

2
mm/nommu.c
View file

@ -639,7 +639,7 @@ static int validate_mmap_request(struct file *file,
}
/* allow the security API to have its say */
ret = security_file_mmap(file, reqprot, prot, flags);
ret = security_file_mmap(file, reqprot, prot, flags, addr, 0);
if (ret < 0)
return ret;

6
security/dummy.c
View file

@ -420,8 +420,12 @@ static int dummy_file_ioctl (struct file *file, unsigned int command,
static int dummy_file_mmap (struct file *file, unsigned long reqprot,
unsigned long prot,
unsigned long flags)
unsigned long flags,
unsigned long addr,
unsigned long addr_only)
{
if (addr < mmap_min_addr)
return -EACCES;
return 0;
}

1
security/security.c
View file

@ -24,6 +24,7 @@ extern struct security_operations dummy_security_ops;
extern void security_fixup_ops(struct security_operations *ops);
struct security_operations *security_ops; /* Initialized to NULL */
unsigned long mmap_min_addr; /* 0 means no protection */
static inline int verify(struct security_operations *ops)
{

12
security/selinux/avc.c
View file

@ -586,7 +586,7 @@ void avc_audit(u32 ssid, u32 tsid,
}
}
if (inode)
audit_log_format(ab, " dev=%s ino=%ld",
audit_log_format(ab, " dev=%s ino=%lu",
inode->i_sb->s_id,
inode->i_ino);
break;
@ -832,6 +832,7 @@ int avc_ss_reset(u32 seqno)
* @tsid: target security identifier
* @tclass: target security class
* @requested: requested permissions, interpreted based on @tclass
* @flags: AVC_STRICT or 0
* @avd: access vector decisions
*
* Check the AVC to determine whether the @requested permissions are granted
@ -846,8 +847,9 @@ int avc_ss_reset(u32 seqno)
* should be released for the auditing.
*/
int avc_has_perm_noaudit(u32 ssid, u32 tsid,
u16 tclass, u32 requested,
struct av_decision *avd)
u16 tclass, u32 requested,
unsigned flags,
struct av_decision *avd)
{
struct avc_node *node;
struct avc_entry entry, *p_ae;
@ -874,7 +876,7 @@ int avc_has_perm_noaudit(u32 ssid, u32 tsid,
denied = requested & ~(p_ae->avd.allowed);
if (!requested || denied) {
if (selinux_enforcing)
if (selinux_enforcing || (flags & AVC_STRICT))
rc = -EACCES;
else
if (node)
@ -909,7 +911,7 @@ int avc_has_perm(u32 ssid, u32 tsid, u16 tclass,
struct av_decision avd;
int rc;
rc = avc_has_perm_noaudit(ssid, tsid, tclass, requested, &avd);
rc = avc_has_perm_noaudit(ssid, tsid, tclass, requested, 0, &avd);
avc_audit(ssid, tsid, tclass, requested, &avd, rc, auditdata);
return rc;
}

42
security/selinux/hooks.c
View file

@ -1592,9 +1592,10 @@ static int selinux_vm_enough_memory(long pages)
rc = secondary_ops->capable(current, CAP_SYS_ADMIN);
if (rc == 0)
rc = avc_has_perm_noaudit(tsec->sid, tsec->sid,
SECCLASS_CAPABILITY,
CAP_TO_MASK(CAP_SYS_ADMIN),
NULL);
SECCLASS_CAPABILITY,
CAP_TO_MASK(CAP_SYS_ADMIN),
0,
NULL);
if (rc == 0)
cap_sys_admin = 1;
@ -2568,12 +2569,16 @@ static int file_map_prot_check(struct file *file, unsigned long prot, int shared
}
static int selinux_file_mmap(struct file *file, unsigned long reqprot,
unsigned long prot, unsigned long flags)
unsigned long prot, unsigned long flags,
unsigned long addr, unsigned long addr_only)
{
int rc;
int rc = 0;
u32 sid = ((struct task_security_struct*)(current->security))->sid;
rc = secondary_ops->file_mmap(file, reqprot, prot, flags);
if (rc)
if (addr < mmap_min_addr)
rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT,
MEMPROTECT__MMAP_ZERO, NULL);
if (rc || addr_only)
return rc;
if (selinux_checkreqprot)
@ -3124,17 +3129,19 @@ static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad,
/**
* selinux_skb_extlbl_sid - Determine the external label of a packet
* @skb: the packet
* @base_sid: the SELinux SID to use as a context for MLS only external labels
* @sid: the packet's SID
*
* Description:
* Check the various different forms of external packet labeling and determine
* the external SID for the packet.
* the external SID for the packet. If only one form of external labeling is
* present then it is used, if both labeled IPsec and NetLabel labels are
* present then the SELinux type information is taken from the labeled IPsec
* SA and the MLS sensitivity label information is taken from the NetLabel
* security attributes. This bit of "magic" is done in the call to
* selinux_netlbl_skbuff_getsid().
*
*/
static void selinux_skb_extlbl_sid(struct sk_buff *skb,
u32 base_sid,
u32 *sid)
static void selinux_skb_extlbl_sid(struct sk_buff *skb, u32 *sid)
{
u32 xfrm_sid;
u32 nlbl_sid;
@ -3142,10 +3149,9 @@ static void selinux_skb_extlbl_sid(struct sk_buff *skb,
selinux_skb_xfrm_sid(skb, &xfrm_sid);
if (selinux_netlbl_skbuff_getsid(skb,
(xfrm_sid == SECSID_NULL ?
base_sid : xfrm_sid),
SECINITSID_NETMSG : xfrm_sid),
&nlbl_sid) != 0)
nlbl_sid = SECSID_NULL;
*sid = (nlbl_sid == SECSID_NULL ? xfrm_sid : nlbl_sid);
}
@ -3690,7 +3696,7 @@ static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *
if (sock && sock->sk->sk_family == PF_UNIX)
selinux_get_inode_sid(SOCK_INODE(sock), &peer_secid);
else if (skb)
selinux_skb_extlbl_sid(skb, SECINITSID_UNLABELED, &peer_secid);
selinux_skb_extlbl_sid(skb, &peer_secid);
if (peer_secid == SECSID_NULL)
err = -EINVAL;
@ -3751,7 +3757,7 @@ static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
u32 newsid;
u32 peersid;
selinux_skb_extlbl_sid(skb, SECINITSID_UNLABELED, &peersid);
selinux_skb_extlbl_sid(skb, &peersid);
if (peersid == SECSID_NULL) {
req->secid = sksec->sid;
req->peer_secid = SECSID_NULL;
@ -3789,7 +3795,7 @@ static void selinux_inet_conn_established(struct sock *sk,
{
struct sk_security_struct *sksec = sk->sk_security;
selinux_skb_extlbl_sid(skb, SECINITSID_UNLABELED, &sksec->peer_sid);
selinux_skb_extlbl_sid(skb, &sksec->peer_sid);
}
static void selinux_req_classify_flow(const struct request_sock *req,
@ -4626,7 +4632,7 @@ static int selinux_setprocattr(struct task_struct *p,
if (p->ptrace & PT_PTRACED) {
error = avc_has_perm_noaudit(tsec->ptrace_sid, sid,
SECCLASS_PROCESS,
PROCESS__PTRACE, &avd);
PROCESS__PTRACE, 0, &avd);
if (!error)
tsec->sid = sid;
task_unlock(p);

1
security/selinux/include/av_perm_to_string.h
View file

@ -158,3 +158,4 @@
S_(SECCLASS_KEY, KEY__CREATE, "create")
S_(SECCLASS_DCCP_SOCKET, DCCP_SOCKET__NODE_BIND, "node_bind")
S_(SECCLASS_DCCP_SOCKET, DCCP_SOCKET__NAME_CONNECT, "name_connect")
S_(SECCLASS_MEMPROTECT, MEMPROTECT__MMAP_ZERO, "mmap_zero")

1
security/selinux/include/av_permissions.h
View file

@ -823,3 +823,4 @@
#define DCCP_SOCKET__NAME_BIND 0x00200000UL
#define DCCP_SOCKET__NODE_BIND 0x00400000UL
#define DCCP_SOCKET__NAME_CONNECT 0x00800000UL
#define MEMPROTECT__MMAP_ZERO 0x00000001UL

6
security/selinux/include/avc.h
View file

@ -102,9 +102,11 @@ void avc_audit(u32 ssid, u32 tsid,
u16 tclass, u32 requested,
struct av_decision *avd, int result, struct avc_audit_data *auditdata);
#define AVC_STRICT 1 /* Ignore permissive mode. */
int avc_has_perm_noaudit(u32 ssid, u32 tsid,
u16 tclass, u32 requested,
struct av_decision *avd);
u16 tclass, u32 requested,
unsigned flags,
struct av_decision *avd);
int avc_has_perm(u32 ssid, u32 tsid,
u16 tclass, u32 requested,

1
security/selinux/include/class_to_string.h
View file

@ -63,3 +63,4 @@
S_("key")
S_(NULL)
S_("dccp_socket")
S_("memprotect")

1
security/selinux/include/flask.h
View file

@ -49,6 +49,7 @@
#define SECCLASS_PACKET 57
#define SECCLASS_KEY 58
#define SECCLASS_DCCP_SOCKET 60
#define SECCLASS_MEMPROTECT 61
/*
* Security identifier indices for initial entities

4
security/selinux/include/security.h
View file

@ -41,6 +41,7 @@ extern int selinux_mls_enabled;
int security_load_policy(void * data, size_t len);
#define SEL_VEC_MAX 32
struct av_decision {
u32 allowed;
u32 decided;
@ -87,6 +88,9 @@ int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
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);
#define SECURITY_FS_USE_XATTR 1 /* use xattr */
#define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
#define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */

34
security/selinux/netlabel.c
View file

@ -158,9 +158,7 @@ int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, u32 base_sid, u32 *sid)
netlbl_secattr_init(&secattr);
rc = netlbl_skbuff_getattr(skb, &secattr);
if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE)
rc = security_netlbl_secattr_to_sid(&secattr,
base_sid,
sid);
rc = security_netlbl_secattr_to_sid(&secattr, base_sid, sid);
else
*sid = SECSID_NULL;
netlbl_secattr_destroy(&secattr);
@ -198,7 +196,7 @@ void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock)
if (netlbl_sock_getattr(sk, &secattr) == 0 &&
secattr.flags != NETLBL_SECATTR_NONE &&
security_netlbl_secattr_to_sid(&secattr,
SECINITSID_UNLABELED,
SECINITSID_NETMSG,
&nlbl_peer_sid) == 0)
sksec->peer_sid = nlbl_peer_sid;
netlbl_secattr_destroy(&secattr);
@ -295,38 +293,32 @@ int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
struct avc_audit_data *ad)
{
int rc;
u32 netlbl_sid;
u32 recv_perm;
u32 nlbl_sid;
u32 perm;
rc = selinux_netlbl_skbuff_getsid(skb,
SECINITSID_UNLABELED,
&netlbl_sid);
rc = selinux_netlbl_skbuff_getsid(skb, SECINITSID_NETMSG, &nlbl_sid);
if (rc != 0)
return rc;
if (netlbl_sid == SECSID_NULL)
return 0;
if (nlbl_sid == SECSID_NULL)
nlbl_sid = SECINITSID_UNLABELED;
switch (sksec->sclass) {
case SECCLASS_UDP_SOCKET:
recv_perm = UDP_SOCKET__RECVFROM;
perm = UDP_SOCKET__RECVFROM;
break;
case SECCLASS_TCP_SOCKET:
recv_perm = TCP_SOCKET__RECVFROM;
perm = TCP_SOCKET__RECVFROM;
break;
default:
recv_perm = RAWIP_SOCKET__RECVFROM;
perm = RAWIP_SOCKET__RECVFROM;
}
rc = avc_has_perm(sksec->sid,
netlbl_sid,
sksec->sclass,
recv_perm,
ad);
rc = avc_has_perm(sksec->sid, nlbl_sid, sksec->sclass, perm, ad);
if (rc == 0)
return 0;
netlbl_skbuff_err(skb, rc);
if (nlbl_sid != SECINITSID_UNLABELED)
netlbl_skbuff_err(skb, rc);
return rc;
}

269
security/selinux/selinuxfs.c
View file

@ -67,6 +67,10 @@ static struct dentry *bool_dir = NULL;
static int bool_num = 0;
static int *bool_pending_values = NULL;
/* global data for classes */
static struct dentry *class_dir = NULL;
static unsigned long last_class_ino;
extern void selnl_notify_setenforce(int val);
/* Check whether a task is allowed to use a security operation. */
@ -106,6 +110,7 @@ static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
#define SEL_INITCON_INO_OFFSET 0x01000000
#define SEL_BOOL_INO_OFFSET 0x02000000
#define SEL_CLASS_INO_OFFSET 0x04000000
#define SEL_INO_MASK 0x00ffffff
#define TMPBUFLEN 12
@ -237,6 +242,11 @@ static const struct file_operations sel_policyvers_ops = {
/* declaration for sel_write_load */
static int sel_make_bools(void);
static int sel_make_classes(void);
/* declaration for sel_make_class_dirs */
static int sel_make_dir(struct inode *dir, struct dentry *dentry,
unsigned long *ino);
static ssize_t sel_read_mls(struct file *filp, char __user *buf,
size_t count, loff_t *ppos)
@ -287,10 +297,18 @@ static ssize_t sel_write_load(struct file * file, const char __user * buf,
goto out;
ret = sel_make_bools();
if (ret) {
length = ret;
goto out1;
}
ret = sel_make_classes();
if (ret)
length = ret;
else
length = count;
out1:
audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
"policy loaded auid=%u",
audit_get_loginuid(current->audit_context));
@ -940,9 +958,8 @@ static const struct file_operations sel_commit_bools_ops = {
.write = sel_commit_bools_write,
};
/* delete booleans - partial revoke() from
* fs/proc/generic.c proc_kill_inodes */
static void sel_remove_bools(struct dentry *de)
/* partial revoke() from fs/proc/generic.c proc_kill_inodes */
static void sel_remove_entries(struct dentry *de)
{
struct list_head *p, *node;
struct super_block *sb = de->d_sb;
@ -998,7 +1015,7 @@ static int sel_make_bools(void)
kfree(bool_pending_values);
bool_pending_values = NULL;
sel_remove_bools(dir);
sel_remove_entries(dir);
if (!(page = (char*)get_zeroed_page(GFP_KERNEL)))
return -ENOMEM;
@ -1048,7 +1065,7 @@ static int sel_make_bools(void)
return ret;
err:
kfree(values);
sel_remove_bools(dir);
sel_remove_entries(dir);
ret = -ENOMEM;
goto out;
}
@ -1294,7 +1311,227 @@ static int sel_make_initcon_files(struct dentry *dir)
return ret;
}
static int sel_make_dir(struct inode *dir, struct dentry *dentry)
static inline unsigned int sel_div(unsigned long a, unsigned long b)
{
return a / b - (a % b < 0);
}
static inline unsigned long sel_class_to_ino(u16 class)
{
return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
}
static inline u16 sel_ino_to_class(unsigned long ino)
{
return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
}
static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
{
return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
}
static inline u32 sel_ino_to_perm(unsigned long ino)
{
return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
}
static ssize_t sel_read_class(struct file * file, char __user *buf,
size_t count, loff_t *ppos)
{
ssize_t rc, len;
char *page;
unsigned long ino = file->f_path.dentry->d_inode->i_ino;
page = (char *)__get_free_page(GFP_KERNEL);
if (!page) {
rc = -ENOMEM;
goto out;
}
len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
rc = simple_read_from_buffer(buf, count, ppos, page, len);
free_page((unsigned long)page);
out:
return rc;
}
static const struct file_operations sel_class_ops = {
.read = sel_read_class,
};
static ssize_t sel_read_perm(struct file * file, char __user *buf,
size_t count, loff_t *ppos)
{
ssize_t rc, len;
char *page;
unsigned long ino = file->f_path.dentry->d_inode->i_ino;
page = (char *)__get_free_page(GFP_KERNEL);
if (!page) {
rc = -ENOMEM;
goto out;
}
len = snprintf(page, PAGE_SIZE,"%d", sel_ino_to_perm(ino));
rc = simple_read_from_buffer(buf, count, ppos, page, len);
free_page((unsigned long)page);
out:
return rc;
}
static const struct file_operations sel_perm_ops = {
.read = sel_read_perm,
};
static int sel_make_perm_files(char *objclass, int classvalue,
struct dentry *dir)
{
int i, rc = 0, nperms;
char **perms;
rc = security_get_permissions(objclass, &perms, &nperms);
if (rc)
goto out;
for (i = 0; i < nperms; i++) {
struct inode *inode;
struct dentry *dentry;
dentry = d_alloc_name(dir, perms[i]);
if (!dentry) {
rc = -ENOMEM;
goto out1;
}
inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
if (!inode) {
rc = -ENOMEM;
goto out1;
}
inode->i_fop = &sel_perm_ops;
/* i+1 since perm values are 1-indexed */
inode->i_ino = sel_perm_to_ino(classvalue, i+1);
d_add(dentry, inode);
}
out1:
for (i = 0; i < nperms; i++)
kfree(perms[i]);
kfree(perms);
out:
return rc;
}
static int sel_make_class_dir_entries(char *classname, int index,
struct dentry *dir)
{
struct dentry *dentry = NULL;
struct inode *inode = NULL;
int rc;
dentry = d_alloc_name(dir, "index");
if (!dentry) {
rc = -ENOMEM;
goto out;
}
inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
if (!inode) {
rc = -ENOMEM;
goto out;
}
inode->i_fop = &sel_class_ops;
inode->i_ino = sel_class_to_ino(index);
d_add(dentry, inode);
dentry = d_alloc_name(dir, "perms");
if (!dentry) {
rc = -ENOMEM;
goto out;
}
rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
if (rc)
goto out;
rc = sel_make_perm_files(classname, index, dentry);
out:
return rc;
}
static void sel_remove_classes(void)
{
struct list_head *class_node;
list_for_each(class_node, &class_dir->d_subdirs) {
struct dentry *class_subdir = list_entry(class_node,
struct dentry, d_u.d_child);
struct list_head *class_subdir_node;
list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
struct dentry *d = list_entry(class_subdir_node,
struct dentry, d_u.d_child);
if (d->d_inode)
if (d->d_inode->i_mode & S_IFDIR)
sel_remove_entries(d);
}
sel_remove_entries(class_subdir);
}
sel_remove_entries(class_dir);
}
static int sel_make_classes(void)
{
int rc = 0, nclasses, i;
char **classes;
/* delete any existing entries */
sel_remove_classes();
rc = security_get_classes(&classes, &nclasses);
if (rc < 0)
goto out;
/* +2 since classes are 1-indexed */
last_class_ino = sel_class_to_ino(nclasses+2);
for (i = 0; i < nclasses; i++) {
struct dentry *class_name_dir;
class_name_dir = d_alloc_name(class_dir, classes[i]);
if (!class_name_dir) {
rc = -ENOMEM;
goto out1;
}
rc = sel_make_dir(class_dir->d_inode, class_name_dir,
&last_class_ino);
if (rc)
goto out1;
/* i+1 since class values are 1-indexed */
rc = sel_make_class_dir_entries(classes[i], i+1,
class_name_dir);
if (rc)
goto out1;
}
out1:
for (i = 0; i < nclasses; i++)
kfree(classes[i]);
kfree(classes);
out:
return rc;
}
static int sel_make_dir(struct inode *dir, struct dentry *dentry,
unsigned long *ino)
{
int ret = 0;
struct inode *inode;
@ -1306,7 +1543,7 @@ static int sel_make_dir(struct inode *dir, struct dentry *dentry)
}
inode->i_op = &simple_dir_inode_operations;
inode->i_fop = &simple_dir_operations;
inode->i_ino = ++sel_last_ino;
inode->i_ino = ++(*ino);
/* directory inodes start off with i_nlink == 2 (for "." entry) */
inc_nlink(inode);
d_add(dentry, inode);
@ -1352,7 +1589,7 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent)
goto err;
}
ret = sel_make_dir(root_inode, dentry);
ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
if (ret)
goto err;
@ -1385,7 +1622,7 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent)
goto err;
}
ret = sel_make_dir(root_inode, dentry);
ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
if (ret)
goto err;
@ -1399,7 +1636,7 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent)
goto err;
}
ret = sel_make_dir(root_inode, dentry);
ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
if (ret)
goto err;
@ -1407,6 +1644,18 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent)
if (ret)
goto err;
dentry = d_alloc_name(sb->s_root, "class");
if (!dentry) {
ret = -ENOMEM;
goto err;
}
ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
if (ret)
goto err;
class_dir = dentry;
out:
return ret;
err:

7
security/selinux/ss/policydb.c
View file

@ -21,6 +21,7 @@
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/errno.h>
@ -598,6 +599,7 @@ void policydb_destroy(struct policydb *p)
struct range_trans *rt, *lrt = 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);
}
@ -612,6 +614,7 @@ void policydb_destroy(struct policydb *p)
avtab_destroy(&p->te_avtab);
for (i = 0; i < OCON_NUM; i++) {
cond_resched();
c = p->ocontexts[i];
while (c) {
ctmp = c;
@ -623,6 +626,7 @@ void policydb_destroy(struct policydb *p)
g = p->genfs;
while (g) {
cond_resched();
kfree(g->fstype);
c = g->head;
while (c) {
@ -639,18 +643,21 @@ void policydb_destroy(struct policydb *p)
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);
for (rt = p->range_tr; rt; rt = rt -> next) {
cond_resched();
if (lrt) {
ebitmap_destroy(&lrt->target_range.level[0].cat);
ebitmap_destroy(&lrt->target_range.level[1].cat);

144
security/selinux/ss/services.c
View file

@ -1587,19 +1587,18 @@ int security_get_user_sids(u32 fromsid,
u32 *nel)
{
struct context *fromcon, usercon;
u32 *mysids, *mysids2, sid;
u32 *mysids = NULL, *mysids2, sid;
u32 mynel = 0, maxnel = SIDS_NEL;
struct user_datum *user;
struct role_datum *role;
struct av_decision avd;
struct ebitmap_node *rnode, *tnode;
int rc = 0, i, j;
if (!ss_initialized) {
*sids = NULL;
*nel = 0;
*sids = NULL;
*nel = 0;
if (!ss_initialized)
goto out;
}
POLICY_RDLOCK;
@ -1635,17 +1634,9 @@ int security_get_user_sids(u32 fromsid,
if (mls_setup_user_range(fromcon, user, &usercon))
continue;
rc = context_struct_compute_av(fromcon, &usercon,
SECCLASS_PROCESS,
PROCESS__TRANSITION,
&avd);
if (rc || !(avd.allowed & PROCESS__TRANSITION))
continue;
rc = sidtab_context_to_sid(&sidtab, &usercon, &sid);
if (rc) {
kfree(mysids);
if (rc)
goto out_unlock;
}
if (mynel < maxnel) {
mysids[mynel++] = sid;
} else {
@ -1653,7 +1644,6 @@ int security_get_user_sids(u32 fromsid,
mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC);
if (!mysids2) {
rc = -ENOMEM;
kfree(mysids);
goto out_unlock;
}
memcpy(mysids2, mysids, mynel * sizeof(*mysids2));
@ -1664,11 +1654,32 @@ int security_get_user_sids(u32 fromsid,
}
}
*sids = mysids;
*nel = mynel;
out_unlock:
POLICY_RDUNLOCK;
if (rc || !mynel) {
kfree(mysids);
goto out;
}
mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL);
if (!mysids2) {
rc = -ENOMEM;
kfree(mysids);
goto out;
}
for (i = 0, j = 0; i < mynel; i++) {
rc = avc_has_perm_noaudit(fromsid, mysids[i],
SECCLASS_PROCESS,
PROCESS__TRANSITION, AVC_STRICT,
NULL);
if (!rc)
mysids2[j++] = mysids[i];
cond_resched();
}
rc = 0;
kfree(mysids);
*sids = mysids2;
*nel = j;
out:
return rc;
}
@ -1996,6 +2007,101 @@ int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid)
return rc;
}
static int get_classes_callback(void *k, void *d, void *args)
{
struct class_datum *datum = d;
char *name = k, **classes = args;
int value = datum->value - 1;
classes[value] = kstrdup(name, GFP_ATOMIC);
if (!classes[value])
return -ENOMEM;
return 0;
}
int security_get_classes(char ***classes, int *nclasses)
{
int rc = -ENOMEM;
POLICY_RDLOCK;
*nclasses = policydb.p_classes.nprim;
*classes = kcalloc(*nclasses, sizeof(*classes), GFP_ATOMIC);
if (!*classes)
goto out;
rc = hashtab_map(policydb.p_classes.table, get_classes_callback,
*classes);
if (rc < 0) {
int i;
for (i = 0; i < *nclasses; i++)
kfree((*classes)[i]);
kfree(*classes);
}
out:
POLICY_RDUNLOCK;
return rc;
}
static int get_permissions_callback(void *k, void *d, void *args)
{
struct perm_datum *datum = d;
char *name = k, **perms = args;
int value = datum->value - 1;
perms[value] = kstrdup(name, GFP_ATOMIC);
if (!perms[value])
return -ENOMEM;
return 0;
}
int security_get_permissions(char *class, char ***perms, int *nperms)
{
int rc = -ENOMEM, i;
struct class_datum *match;
POLICY_RDLOCK;
match = hashtab_search(policydb.p_classes.table, class);
if (!match) {
printk(KERN_ERR "%s: unrecognized class %s\n",
__FUNCTION__, class);
rc = -EINVAL;
goto out;
}
*nperms = match->permissions.nprim;
*perms = kcalloc(*nperms, sizeof(*perms), GFP_ATOMIC);
if (!*perms)
goto out;
if (match->comdatum) {
rc = hashtab_map(match->comdatum->permissions.table,
get_permissions_callback, *perms);
if (rc < 0)
goto err;
}
rc = hashtab_map(match->permissions.table, get_permissions_callback,
*perms);
if (rc < 0)
goto err;
out:
POLICY_RDUNLOCK;
return rc;
err:
POLICY_RDUNLOCK;
for (i = 0; i < *nperms; i++)
kfree((*perms)[i]);
kfree(*perms);
return rc;
}
struct selinux_audit_rule {
u32 au_seqno;
struct context au_ctxt;