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Merge branch 'smack-for-3.12' of git://git.gitorious.org/smack-next/kernel into ra-next

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This commit is contained in:
James Morris 2013-08-23 02:50:12 +10:00
commit 7320336146
4 changed files with 151 additions and 115 deletions
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13
security/smack/smack.h
View File

@ -53,6 +53,7 @@
*/
struct smack_known {
struct list_head list;
struct hlist_node smk_hashed;
char *smk_known;
u32 smk_secid;
struct netlbl_lsm_secattr smk_netlabel; /* on wire labels */
@ -167,9 +168,13 @@ struct smk_port_label {
#define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
#define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */
#define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */
#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
#define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */
/*
* CIPSO 2.2 standard is 239, but Smack wants to use the
* categories in a structured way that limits the value to
* the bits in 23 bytes, hence the unusual number.
*/
#define SMACK_CIPSO_MAXCATNUM 184 /* 23 * 8 */
/*
* Flag for transmute access
@ -222,6 +227,7 @@ char *smk_parse_smack(const char *string, int len);
int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
char *smk_import(const char *, int);
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 *);
u32 smack_to_secid(const char *);
@ -247,6 +253,9 @@ extern struct list_head smk_netlbladdr_list;
extern struct security_operations smack_ops;
#define SMACK_HASH_SLOTS 16
extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
/*
* Is the directory transmuting?
*/

29
security/smack/smack_access.c
View File

@ -325,6 +325,25 @@ void smack_log(char *subject_label, char *object_label, int request,
DEFINE_MUTEX(smack_known_lock);
struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
/**
* smk_insert_entry - insert a smack label into a hash map,
*
* this function must be called under smack_known_lock
*/
void smk_insert_entry(struct smack_known *skp)
{
unsigned int hash;
struct hlist_head *head;
hash = full_name_hash(skp->smk_known, strlen(skp->smk_known));
head = &smack_known_hash[hash & (SMACK_HASH_SLOTS - 1)];
hlist_add_head_rcu(&skp->smk_hashed, head);
list_add_rcu(&skp->list, &smack_known_list);
}
/**
* smk_find_entry - find a label on the list, return the list entry
* @string: a text string that might be a Smack label
@ -334,12 +353,16 @@ DEFINE_MUTEX(smack_known_lock);
*/
struct smack_known *smk_find_entry(const char *string)
{
unsigned int hash;
struct hlist_head *head;
struct smack_known *skp;
list_for_each_entry_rcu(skp, &smack_known_list, list) {
hash = full_name_hash(string, strlen(string));
head = &smack_known_hash[hash & (SMACK_HASH_SLOTS - 1)];
hlist_for_each_entry_rcu(skp, head, smk_hashed)
if (strcmp(skp->smk_known, string) == 0)
return skp;
}
return NULL;
}
@ -475,7 +498,7 @@ struct smack_known *smk_import_entry(const char *string, int len)
* Make sure that the entry is actually
* filled before putting it on the list.
*/
list_add_rcu(&skp->list, &smack_known_list);
smk_insert_entry(skp);
goto unlockout;
}
/*

42
security/smack/smack_lsm.c
View File

@ -3063,6 +3063,8 @@ static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
{
struct smack_known *skp;
int found = 0;
int acat;
int kcat;
if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
/*
@ -3079,12 +3081,28 @@ static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
list_for_each_entry(skp, &smack_known_list, list) {
if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
continue;
if (memcmp(sap->attr.mls.cat,
skp->smk_netlabel.attr.mls.cat,
SMK_CIPSOLEN) != 0)
continue;
found = 1;
break;
/*
* Compare the catsets. Use the netlbl APIs.
*/
if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
if ((skp->smk_netlabel.flags &
NETLBL_SECATTR_MLS_CAT) == 0)
found = 1;
break;
}
for (acat = -1, kcat = -1; acat == kcat; ) {
acat = netlbl_secattr_catmap_walk(
sap->attr.mls.cat, acat + 1);
kcat = netlbl_secattr_catmap_walk(
skp->smk_netlabel.attr.mls.cat,
kcat + 1);
if (acat < 0 || kcat < 0)
break;
}
if (acat == kcat) {
found = 1;
break;
}
}
rcu_read_unlock();
@ -3876,12 +3894,12 @@ static __init void init_smack_known_list(void)
/*
* Create the known labels list
*/
list_add(&smack_known_huh.list, &smack_known_list);
list_add(&smack_known_hat.list, &smack_known_list);
list_add(&smack_known_star.list, &smack_known_list);
list_add(&smack_known_floor.list, &smack_known_list);
list_add(&smack_known_invalid.list, &smack_known_list);
list_add(&smack_known_web.list, &smack_known_list);
smk_insert_entry(&smack_known_huh);
smk_insert_entry(&smack_known_hat);
smk_insert_entry(&smack_known_star);
smk_insert_entry(&smack_known_floor);
smk_insert_entry(&smack_known_invalid);
smk_insert_entry(&smack_known_web);
}
/**

182
security/smack/smackfs.c
View File

@ -368,56 +368,43 @@ static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
* @data: string to be parsed, null terminated
* @rule: Will be filled with Smack parsed rule
* @import: if non-zero, import labels
* @change: if non-zero, data is from /smack/change-rule
* @tokens: numer of substrings expected in data
*
* Returns 0 on success, -1 on failure
* Returns number of processed bytes on success, -1 on failure.
*/
static int smk_parse_long_rule(const char *data, struct smack_parsed_rule *rule,
int import, int change)
static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
int import, int tokens)
{
char *subject;
char *object;
char *access1;
char *access2;
int datalen;
int rc = -1;
ssize_t cnt = 0;
char *tok[4];
int i;
/* This is inefficient */
datalen = strlen(data);
/*
* Parsing the rule in-place, filling all white-spaces with '\0'
*/
for (i = 0; i < tokens; ++i) {
while (isspace(data[cnt]))
data[cnt++] = '\0';
/* Our first element can be 64 + \0 with no spaces */
subject = kzalloc(datalen + 1, GFP_KERNEL);
if (subject == NULL)
return -1;
object = kzalloc(datalen, GFP_KERNEL);
if (object == NULL)
goto free_out_s;
access1 = kzalloc(datalen, GFP_KERNEL);
if (access1 == NULL)
goto free_out_o;
access2 = kzalloc(datalen, GFP_KERNEL);
if (access2 == NULL)
goto free_out_a;
if (data[cnt] == '\0')
/* Unexpected end of data */
return -1;
if (change) {
if (sscanf(data, "%s %s %s %s",
subject, object, access1, access2) == 4)
rc = smk_fill_rule(subject, object, access1, access2,
rule, import, 0);
} else {
if (sscanf(data, "%s %s %s", subject, object, access1) == 3)
rc = smk_fill_rule(subject, object, access1, NULL,
rule, import, 0);
tok[i] = data + cnt;
while (data[cnt] && !isspace(data[cnt]))
++cnt;
}
while (isspace(data[cnt]))
data[cnt++] = '\0';
kfree(access2);
free_out_a:
kfree(access1);
free_out_o:
kfree(object);
free_out_s:
kfree(subject);
return rc;
while (i < 4)
tok[i++] = NULL;
if (smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0))
return -1;
return cnt;
}
#define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
@ -447,11 +434,12 @@ static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
struct list_head *rule_list,
struct mutex *rule_lock, int format)
{
struct smack_parsed_rule *rule;
struct smack_parsed_rule rule;
char *data;
int datalen;
int rc = -EINVAL;
int load = 0;
int rc;
int trunc = 0;
int tokens;
ssize_t cnt = 0;
/*
* No partial writes.
@ -466,11 +454,14 @@ static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
*/
if (count != SMK_OLOADLEN && count != SMK_LOADLEN)
return -EINVAL;
datalen = SMK_LOADLEN;
} else
datalen = count + 1;
} else {
if (count >= PAGE_SIZE) {
count = PAGE_SIZE - 1;
trunc = 1;
}
}
data = kzalloc(datalen, GFP_KERNEL);
data = kmalloc(count + 1, GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
@ -479,47 +470,49 @@ static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
goto out;
}
rule = kzalloc(sizeof(*rule), GFP_KERNEL);
if (rule == NULL) {
rc = -ENOMEM;
goto out;
/*
* In case of parsing only part of user buf,
* avoid having partial rule at the data buffer
*/
if (trunc) {
while (count > 0 && (data[count - 1] != '\n'))
--count;
if (count == 0) {
rc = -EINVAL;
goto out;
}
}
if (format == SMK_LONG_FMT) {
/*
* Be sure the data string is terminated.
*/
data[count] = '\0';
if (smk_parse_long_rule(data, rule, 1, 0))
goto out_free_rule;
} else if (format == SMK_CHANGE_FMT) {
data[count] = '\0';
if (smk_parse_long_rule(data, rule, 1, 1))
goto out_free_rule;
} else {
/*
* More on the minor hack for backward compatibility
*/
if (count == (SMK_OLOADLEN))
data[SMK_OLOADLEN] = '-';
if (smk_parse_rule(data, rule, 1))
goto out_free_rule;
data[count] = '\0';
tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
while (cnt < count) {
if (format == SMK_FIXED24_FMT) {
rc = smk_parse_rule(data, &rule, 1);
if (rc != 0) {
rc = -EINVAL;
goto out;
}
cnt = count;
} else {
rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
if (rc <= 0) {
rc = -EINVAL;
goto out;
}
cnt += rc;
}
if (rule_list == NULL)
rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
&rule.smk_subject->smk_rules_lock, 1);
else
rc = smk_set_access(&rule, rule_list, rule_lock, 0);
if (rc)
goto out;
}
if (rule_list == NULL) {
load = 1;
rule_list = &rule->smk_subject->smk_rules;
rule_lock = &rule->smk_subject->smk_rules_lock;
}
rc = smk_set_access(rule, rule_list, rule_lock, load);
if (rc == 0) {
rc = count;
goto out;
}
out_free_rule:
kfree(rule);
rc = cnt;
out:
kfree(data);
return rc;
@ -901,7 +894,7 @@ static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
for (i = 0; i < catlen; i++) {
rule += SMK_DIGITLEN;
ret = sscanf(rule, "%u", &cat);
if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL)
if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
goto out;
smack_catset_bit(cat, mapcatset);
@ -1840,7 +1833,6 @@ static ssize_t smk_user_access(struct file *file, const char __user *buf,
{
struct smack_parsed_rule rule;
char *data;
char *cod;
int res;
data = simple_transaction_get(file, buf, count);
@ -1853,18 +1845,12 @@ static ssize_t smk_user_access(struct file *file, const char __user *buf,
res = smk_parse_rule(data, &rule, 0);
} else {
/*
* Copy the data to make sure the string is terminated.
* simple_transaction_get() returns null-terminated data
*/
cod = kzalloc(count + 1, GFP_KERNEL);
if (cod == NULL)
return -ENOMEM;
memcpy(cod, data, count);
cod[count] = '\0';
res = smk_parse_long_rule(cod, &rule, 0, 0);
kfree(cod);
res = smk_parse_long_rule(data, &rule, 0, 3);
}
if (res)
if (res < 0)
return -EINVAL;
res = smk_access(rule.smk_subject, rule.smk_object,