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Merge branch 'smack-for-4.4' of https://github.com/cschaufler/smack-next into next

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This commit is contained in:
James Morris
2015-10-21 10:49:29 +11:00
parent fbf9826589 38416e5393
commit 09302fd19e
5 changed files with 248 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files
security/smack/smack.h
+3 -1
View File
@@ -115,6 +115,7 @@ struct task_smack {
struct smack_known *smk_forked; /* label when forked */
struct list_head smk_rules; /* per task access rules */
struct mutex smk_rules_lock; /* lock for the rules */
struct list_head smk_relabel; /* transit allowed labels */
};
#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
@@ -169,7 +170,7 @@ struct smk_port_label {
};
#endif /* SMACK_IPV6_PORT_LABELING */
struct smack_onlycap {
struct smack_known_list_elem {
struct list_head list;
struct smack_known *smk_label;
};
@@ -301,6 +302,7 @@ struct smack_known *smk_import_entry(const char *, int);
void smk_insert_entry(struct smack_known *skp);
struct smack_known *smk_find_entry(const char *);
int smack_privileged(int cap);
void smk_destroy_label_list(struct list_head *list);
/*
* Shared data.
security/smack/smack_access.c
+3 -3
View File
@@ -637,7 +637,7 @@ DEFINE_MUTEX(smack_onlycap_lock);
int smack_privileged(int cap)
{
struct smack_known *skp = smk_of_current();
struct smack_onlycap *sop;
struct smack_known_list_elem *sklep;
/*
* All kernel tasks are privileged
@@ -654,8 +654,8 @@ int smack_privileged(int cap)
return 1;
}
list_for_each_entry_rcu(sop, &smack_onlycap_list, list) {
if (sop->smk_label == skp) {
list_for_each_entry_rcu(sklep, &smack_onlycap_list, list) {
if (sklep->smk_label == skp) {
rcu_read_unlock();
return 1;
}
security/smack/smack_lsm.c
+62 -5
View File
@@ -52,7 +52,7 @@
#define SMK_SENDING 2
#ifdef SMACK_IPV6_PORT_LABELING
LIST_HEAD(smk_ipv6_port_list);
static LIST_HEAD(smk_ipv6_port_list);
#endif
static struct kmem_cache *smack_inode_cache;
int smack_enabled;
@@ -326,6 +326,7 @@ static struct task_smack *new_task_smack(struct smack_known *task,
tsp->smk_task = task;
tsp->smk_forked = forked;
INIT_LIST_HEAD(&tsp->smk_rules);
INIT_LIST_HEAD(&tsp->smk_relabel);
mutex_init(&tsp->smk_rules_lock);
return tsp;
@@ -360,6 +361,35 @@ static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
return rc;
}
/**
* smk_copy_relabel - copy smk_relabel labels list
* @nhead: new rules header pointer
* @ohead: old rules header pointer
* @gfp: type of the memory for the allocation
*
* Returns 0 on success, -ENOMEM on error
*/
static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead,
gfp_t gfp)
{
struct smack_known_list_elem *nklep;
struct smack_known_list_elem *oklep;
INIT_LIST_HEAD(nhead);
list_for_each_entry(oklep, ohead, list) {
nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp);
if (nklep == NULL) {
smk_destroy_label_list(nhead);
return -ENOMEM;
}
nklep->smk_label = oklep->smk_label;
list_add(&nklep->list, nhead);
}
return 0;
}
/**
* smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
* @mode - input mode in form of PTRACE_MODE_*
@@ -1922,6 +1952,8 @@ static void smack_cred_free(struct cred *cred)
return;
cred->security = NULL;
smk_destroy_label_list(&tsp->smk_relabel);
list_for_each_safe(l, n, &tsp->smk_rules) {
rp = list_entry(l, struct smack_rule, list);
list_del(&rp->list);
@@ -1953,6 +1985,11 @@ static int smack_cred_prepare(struct cred *new, const struct cred *old,
if (rc != 0)
return rc;
rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel,
gfp);
if (rc != 0)
return rc;
new->security = new_tsp;
return 0;
}
@@ -3354,6 +3391,9 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
*/
isp->smk_inode = smk_of_current();
break;
case PIPEFS_MAGIC:
isp->smk_inode = smk_of_current();
break;
default:
isp->smk_inode = sbsp->smk_root;
break;
@@ -3549,9 +3589,11 @@ static int smack_getprocattr(struct task_struct *p, char *name, char **value)
static int smack_setprocattr(struct task_struct *p, char *name,
void *value, size_t size)
{
struct task_smack *tsp;
struct task_smack *tsp = current_security();
struct cred *new;
struct smack_known *skp;
struct smack_known_list_elem *sklep;
int rc;
/*
* Changing another process' Smack value is too dangerous
@@ -3560,7 +3602,7 @@ static int smack_setprocattr(struct task_struct *p, char *name,
if (p != current)
return -EPERM;
if (!smack_privileged(CAP_MAC_ADMIN))
if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel))
return -EPERM;
if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
@@ -3579,12 +3621,27 @@ static int smack_setprocattr(struct task_struct *p, char *name,
if (skp == &smack_known_web)
return -EPERM;
if (!smack_privileged(CAP_MAC_ADMIN)) {
rc = -EPERM;
list_for_each_entry(sklep, &tsp->smk_relabel, list)
if (sklep->smk_label == skp) {
rc = 0;
break;
}
if (rc)
return rc;
}
new = prepare_creds();
if (new == NULL)
return -ENOMEM;
tsp = new->security;
tsp->smk_task = skp;
/*
* process can change its label only once
*/
smk_destroy_label_list(&tsp->smk_relabel);
commit_creds(new);
return size;
@@ -4708,8 +4765,6 @@ static __init int smack_init(void)
if (!security_module_enable("smack"))
return 0;
smack_enabled = 1;
smack_inode_cache = KMEM_CACHE(inode_smack, 0);
if (!smack_inode_cache)
return -ENOMEM;
@@ -4721,6 +4776,8 @@ static __init int smack_init(void)
return -ENOMEM;
}
smack_enabled = 1;
pr_info("Smack: Initializing.\n");
#ifdef CONFIG_SECURITY_SMACK_NETFILTER
pr_info("Smack: Netfilter enabled.\n");
security/smack/smackfs.c
+170 -38
View File
@@ -61,6 +61,7 @@ enum smk_inos {
#if IS_ENABLED(CONFIG_IPV6)
SMK_NET6ADDR = 23, /* single label IPv6 hosts */
#endif /* CONFIG_IPV6 */
SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */
};
/*
@@ -1501,8 +1502,8 @@ static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
*/
if (smack[0] != '-') {
skp = smk_import_entry(smack, 0);
if (skp == NULL) {
rc = -EINVAL;
if (IS_ERR(skp)) {
rc = PTR_ERR(skp);
goto free_out;
}
} else {
@@ -1914,10 +1915,10 @@ static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos)
static int onlycap_seq_show(struct seq_file *s, void *v)
{
struct list_head *list = v;
struct smack_onlycap *sop =
list_entry_rcu(list, struct smack_onlycap, list);
struct smack_known_list_elem *sklep =
list_entry_rcu(list, struct smack_known_list_elem, list);
seq_puts(s, sop->smk_label->smk_known);
seq_puts(s, sklep->smk_label->smk_known);
seq_putc(s, ' ');
return 0;
@@ -1973,6 +1974,54 @@ static void smk_list_swap_rcu(struct list_head *public,
}
}
/**
* smk_parse_label_list - parse list of Smack labels, separated by spaces
*
* @data: the string to parse
* @private: destination list
*
* Returns zero on success or error code, as appropriate
*/
static int smk_parse_label_list(char *data, struct list_head *list)
{
char *tok;
struct smack_known *skp;
struct smack_known_list_elem *sklep;
while ((tok = strsep(&data, " ")) != NULL) {
if (!*tok)
continue;
skp = smk_import_entry(tok, 0);
if (IS_ERR(skp))
return PTR_ERR(skp);
sklep = kzalloc(sizeof(*sklep), GFP_KERNEL);
if (sklep == NULL)
return -ENOMEM;
sklep->smk_label = skp;
list_add(&sklep->list, list);
}
return 0;
}
/**
* smk_destroy_label_list - destroy a list of smack_known_list_elem
* @head: header pointer of the list to destroy
*/
void smk_destroy_label_list(struct list_head *list)
{
struct smack_known_list_elem *sklep;
struct smack_known_list_elem *sklep2;
list_for_each_entry_safe(sklep, sklep2, list, list)
kfree(sklep);
INIT_LIST_HEAD(list);
}
/**
* smk_write_onlycap - write() for smackfs/onlycap
* @file: file pointer, not actually used
@@ -1986,13 +2035,8 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
char *data;
char *data_parse;
char *tok;
struct smack_known *skp;
struct smack_onlycap *sop;
struct smack_onlycap *sop2;
LIST_HEAD(list_tmp);
int rc = count;
int rc;
if (!smack_privileged(CAP_MAC_ADMIN))
return -EPERM;
@@ -2006,26 +2050,7 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
return -EFAULT;
}
data_parse = data;
while ((tok = strsep(&data_parse, " ")) != NULL) {
if (!*tok)
continue;
skp = smk_import_entry(tok, 0);
if (IS_ERR(skp)) {
rc = PTR_ERR(skp);
break;
}
sop = kzalloc(sizeof(*sop), GFP_KERNEL);
if (sop == NULL) {
rc = -ENOMEM;
break;
}
sop->smk_label = skp;
list_add_rcu(&sop->list, &list_tmp);
}
rc = smk_parse_label_list(data, &list_tmp);
kfree(data);
/*
@@ -2038,17 +2063,14 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
* But do so only on invalid label, not on system errors.
* The invalid label must be first to count as clearing attempt.
*/
if (rc == -EINVAL && list_empty(&list_tmp))
rc = count;
if (rc >= 0) {
if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
mutex_lock(&smack_onlycap_lock);
smk_list_swap_rcu(&smack_onlycap_list, &list_tmp);
mutex_unlock(&smack_onlycap_lock);
rc = count;
}
list_for_each_entry_safe(sop, sop2, &list_tmp, list)
kfree(sop);
smk_destroy_label_list(&list_tmp);
return rc;
}
@@ -2698,6 +2720,113 @@ static const struct file_operations smk_syslog_ops = {
.llseek = default_llseek,
};
/*
* Seq_file read operations for /smack/relabel-self
*/
static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
{
struct task_smack *tsp = current_security();
return smk_seq_start(s, pos, &tsp->smk_relabel);
}
static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
struct task_smack *tsp = current_security();
return smk_seq_next(s, v, pos, &tsp->smk_relabel);
}
static int relabel_self_seq_show(struct seq_file *s, void *v)
{
struct list_head *list = v;
struct smack_known_list_elem *sklep =
list_entry(list, struct smack_known_list_elem, list);
seq_puts(s, sklep->smk_label->smk_known);
seq_putc(s, ' ');
return 0;
}
static const struct seq_operations relabel_self_seq_ops = {
.start = relabel_self_seq_start,
.next = relabel_self_seq_next,
.show = relabel_self_seq_show,
.stop = smk_seq_stop,
};
/**
* smk_open_relabel_self - open() for /smack/relabel-self
* @inode: inode structure representing file
* @file: "relabel-self" file pointer
*
* Connect our relabel_self_seq_* operations with /smack/relabel-self
* file_operations
*/
static int smk_open_relabel_self(struct inode *inode, struct file *file)
{
return seq_open(file, &relabel_self_seq_ops);
}
/**
* smk_write_relabel_self - write() for /smack/relabel-self
* @file: file pointer, not actually used
* @buf: where to get the data from
* @count: bytes sent
* @ppos: where to start - must be 0
*
*/
static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct task_smack *tsp = current_security();
char *data;
int rc;
LIST_HEAD(list_tmp);
/*
* Must have privilege.
*/
if (!smack_privileged(CAP_MAC_ADMIN))
return -EPERM;
/*
* Enough data must be present.
*/
if (*ppos != 0)
return -EINVAL;
data = kzalloc(count + 1, GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
if (copy_from_user(data, buf, count) != 0) {
kfree(data);
return -EFAULT;
}
rc = smk_parse_label_list(data, &list_tmp);
kfree(data);
if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
smk_destroy_label_list(&tsp->smk_relabel);
list_splice(&list_tmp, &tsp->smk_relabel);
return count;
}
smk_destroy_label_list(&list_tmp);
return rc;
}
static const struct file_operations smk_relabel_self_ops = {
.open = smk_open_relabel_self,
.read = seq_read,
.llseek = seq_lseek,
.write = smk_write_relabel_self,
.release = seq_release,
};
/**
* smk_read_ptrace - read() for /smack/ptrace
@@ -2824,6 +2953,9 @@ static int smk_fill_super(struct super_block *sb, void *data, int silent)
[SMK_NET6ADDR] = {
"ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR},
#endif /* CONFIG_IPV6 */
[SMK_RELABEL_SELF] = {
"relabel-self", &smk_relabel_self_ops,
S_IRUGO|S_IWUGO},
/* last one */
{""}
};
@@ -2892,7 +3024,7 @@ static int __init init_smk_fs(void)
int err;
int rc;
if (!security_module_enable("smack"))
if (smack_enabled == 0)
return 0;
err = smk_init_sysfs();