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Make Smack operate on smack_known struct where it still used char*

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Smack used to use a mix of smack_known struct and char* throughout its
APIs and implementation. This patch unifies the behaviour and makes it
store and operate exclusively on smack_known struct pointers when managing
labels.

Signed-off-by: Lukasz Pawelczyk <l.pawelczyk@samsung.com>

Conflicts:
	security/smack/smack_access.c
	security/smack/smack_lsm.c
This commit is contained in:
Lukasz Pawelczyk
2014-08-29 17:02:55 +02:00
committed by Casey Schaufler
parent d01757904d
commit 21c7eae21a
4 changed files with 233 additions and 255 deletions
Download Patch File Download Diff File Expand all files Collapse all files

94
security/smack/smack_access.c
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@@ -94,7 +94,7 @@ int smk_access_entry(char *subject_label, char *object_label,
struct smack_rule *srp;
list_for_each_entry_rcu(srp, rule_list, list) {
if (srp->smk_object == object_label &&
if (srp->smk_object->smk_known == object_label &&
srp->smk_subject->smk_known == subject_label) {
may = srp->smk_access;
break;
@@ -111,8 +111,8 @@ int smk_access_entry(char *subject_label, char *object_label,
/**
* smk_access - determine if a subject has a specific access to an object
* @subject_known: a pointer to the subject's Smack label entry
* @object_label: a pointer to the object's Smack label
* @subject: a pointer to the subject's Smack label entry
* @object: a pointer to the object's Smack label entry
* @request: the access requested, in "MAY" format
* @a : a pointer to the audit data
*
@@ -122,8 +122,8 @@ int smk_access_entry(char *subject_label, char *object_label,
*
* Smack labels are shared on smack_list
*/
int smk_access(struct smack_known *subject_known, char *object_label,
int request, struct smk_audit_info *a)
int smk_access(struct smack_known *subject, struct smack_known *object,
int request, struct smk_audit_info *a)
{
int may = MAY_NOT;
int rc = 0;
@@ -133,7 +133,7 @@ int smk_access(struct smack_known *subject_known, char *object_label,
*
* A star subject can't access any object.
*/
if (subject_known == &smack_known_star) {
if (subject == &smack_known_star) {
rc = -EACCES;
goto out_audit;
}
@@ -142,28 +142,28 @@ int smk_access(struct smack_known *subject_known, char *object_label,
* Tasks cannot be assigned the internet label.
* An internet subject can access any object.
*/
if (object_label == smack_known_web.smk_known ||
subject_known == &smack_known_web)
if (object == &smack_known_web ||
subject == &smack_known_web)
goto out_audit;
/*
* A star object can be accessed by any subject.
*/
if (object_label == smack_known_star.smk_known)
if (object == &smack_known_star)
goto out_audit;
/*
* An object can be accessed in any way by a subject
* with the same label.
*/
if (subject_known->smk_known == object_label)
if (subject->smk_known == object->smk_known)
goto out_audit;
/*
* A hat subject can read any object.
* A floor object can be read by any subject.
*/
if ((request & MAY_ANYREAD) == request) {
if (object_label == smack_known_floor.smk_known)
if (object == &smack_known_floor)
goto out_audit;
if (subject_known == &smack_known_hat)
if (subject == &smack_known_hat)
goto out_audit;
}
/*
@@ -174,8 +174,8 @@ int smk_access(struct smack_known *subject_known, char *object_label,
* indicates there is no entry for this pair.
*/
rcu_read_lock();
may = smk_access_entry(subject_known->smk_known, object_label,
&subject_known->smk_rules);
may = smk_access_entry(subject->smk_known, object->smk_known,
&subject->smk_rules);
rcu_read_unlock();
if (may <= 0 || (request & may) != request) {
@@ -195,8 +195,8 @@ int smk_access(struct smack_known *subject_known, char *object_label,
out_audit:
#ifdef CONFIG_AUDIT
if (a)
smack_log(subject_known->smk_known, object_label, request,
rc, a);
smack_log(subject->smk_known, object->smk_known,
request, rc, a);
#endif
return rc;
@@ -204,8 +204,8 @@ out_audit:
/**
* smk_tskacc - determine if a task has a specific access to an object
* @tsp: a pointer to the subject task
* @obj_label: a pointer to the object's Smack label
* @tsp: a pointer to the subject's task
* @obj_known: a pointer to the object's label entry
* @mode: the access requested, in "MAY" format
* @a : common audit data
*
@@ -214,24 +214,25 @@ out_audit:
* non zero otherwise. It allows that the task may have the capability
* to override the rules.
*/
int smk_tskacc(struct task_smack *subject, char *obj_label,
int smk_tskacc(struct task_smack *tsp, struct smack_known *obj_known,
u32 mode, struct smk_audit_info *a)
{
struct smack_known *skp = smk_of_task(subject);
struct smack_known *sbj_known = smk_of_task(tsp);
int may;
int rc;
/*
* Check the global rule list
*/
rc = smk_access(skp, obj_label, mode, NULL);
rc = smk_access(sbj_known, obj_known, mode, NULL);
if (rc >= 0) {
/*
* If there is an entry in the task's rule list
* it can further restrict access.
*/
may = smk_access_entry(skp->smk_known, obj_label,
&subject->smk_rules);
may = smk_access_entry(sbj_known->smk_known,
obj_known->smk_known,
&tsp->smk_rules);
if (may < 0)
goto out_audit;
if ((mode & may) == mode)
@@ -248,14 +249,15 @@ int smk_tskacc(struct task_smack *subject, char *obj_label,
out_audit:
#ifdef CONFIG_AUDIT
if (a)
smack_log(skp->smk_known, obj_label, mode, rc, a);
smack_log(sbj_known->smk_known, obj_known->smk_known,
mode, rc, a);
#endif
return rc;
}
/**
* smk_curacc - determine if current has a specific access to an object
* @obj_label: a pointer to the object's Smack label
* @obj_known: a pointer to the object's Smack label entry
* @mode: the access requested, in "MAY" format
* @a : common audit data
*
@@ -264,11 +266,12 @@ out_audit:
* non zero otherwise. It allows that current may have the capability
* to override the rules.
*/
int smk_curacc(char *obj_label, u32 mode, struct smk_audit_info *a)
int smk_curacc(struct smack_known *obj_known,
u32 mode, struct smk_audit_info *a)
{
struct task_smack *tsp = current_security();
return smk_tskacc(tsp, obj_label, mode, a);
return smk_tskacc(tsp, obj_known, mode, a);
}
#ifdef CONFIG_AUDIT
@@ -561,27 +564,6 @@ unlockout:
return skp;
}
/**
* smk_import - import a smack label
* @string: a text string that might be a Smack label
* @len: the maximum size, or zero if it is NULL terminated.
*
* Returns a pointer to the label in the label list that
* matches the passed string, adding it if necessary.
*/
char *smk_import(const char *string, int len)
{
struct smack_known *skp;
/* labels cannot begin with a '-' */
if (string[0] == '-')
return NULL;
skp = smk_import_entry(string, len);
if (skp == NULL)
return NULL;
return skp->smk_known;
}
/**
* smack_from_secid - find the Smack label associated with a secid
* @secid: an integer that might be associated with a Smack label
@@ -608,19 +590,3 @@ struct smack_known *smack_from_secid(const u32 secid)
rcu_read_unlock();
return &smack_known_invalid;
}
/**
* smack_to_secid - find the secid associated with a Smack label
* @smack: the Smack label
*
* Returns the appropriate secid if there is one,
* otherwise 0
*/
u32 smack_to_secid(const char *smack)
{
struct smack_known *skp = smk_find_entry(smack);
if (skp == NULL)
return 0;
return skp->smk_secid;
}