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-rw-r--r--security/smack/smack_lsm.c82
1 files changed, 47 insertions, 35 deletions
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 11167fd..e952b39 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -104,8 +104,7 @@ static int smack_ptrace_may_access(struct task_struct *ctp, unsigned int mode)
if (rc != 0)
return rc;
- rc = smk_access(current->cred->security, ctp->cred->security,
- MAY_READWRITE);
+ rc = smk_access(current_security(), task_security(ctp), MAY_READWRITE);
if (rc != 0 && capable(CAP_MAC_OVERRIDE))
return 0;
return rc;
@@ -127,8 +126,7 @@ static int smack_ptrace_traceme(struct task_struct *ptp)
if (rc != 0)
return rc;
- rc = smk_access(ptp->cred->security, current->cred->security,
- MAY_READWRITE);
+ rc = smk_access(task_security(ptp), current_security(), MAY_READWRITE);
if (rc != 0 && has_capability(ptp, CAP_MAC_OVERRIDE))
return 0;
return rc;
@@ -977,22 +975,6 @@ static int smack_file_receive(struct file *file)
*/
/**
- * smack_cred_alloc_security - "allocate" a task cred blob
- * @cred: the task creds in need of a blob
- *
- * Smack isn't using copies of blobs. Everyone
- * points to an immutable list. No alloc required.
- * No data copy required.
- *
- * Always returns 0
- */
-static int smack_cred_alloc_security(struct cred *cred)
-{
- cred->security = current_security();
- return 0;
-}
-
-/**
* smack_cred_free - "free" task-level security credentials
* @cred: the credentials in question
*
@@ -1006,6 +988,30 @@ static void smack_cred_free(struct cred *cred)
}
/**
+ * smack_cred_prepare - prepare new set of credentials for modification
+ * @new: the new credentials
+ * @old: the original credentials
+ * @gfp: the atomicity of any memory allocations
+ *
+ * Prepare a new set of credentials for modification.
+ */
+static int smack_cred_prepare(struct cred *new, const struct cred *old,
+ gfp_t gfp)
+{
+ new->security = old->security;
+ return 0;
+}
+
+/*
+ * commit new credentials
+ * @new: the new credentials
+ * @old: the original credentials
+ */
+static void smack_cred_commit(struct cred *new, const struct cred *old)
+{
+}
+
+/**
* smack_task_setpgid - Smack check on setting pgid
* @p: the task object
* @pgid: unused
@@ -2036,6 +2042,7 @@ 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 cred *new;
char *newsmack;
/*
@@ -2058,7 +2065,11 @@ static int smack_setprocattr(struct task_struct *p, char *name,
if (newsmack == NULL)
return -EINVAL;
- p->cred->security = newsmack;
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+ new->security = newsmack;
+ commit_creds(new);
return size;
}
@@ -2354,17 +2365,17 @@ static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
/**
* smack_key_alloc - Set the key security blob
* @key: object
- * @tsk: the task associated with the key
+ * @cred: the credentials to use
* @flags: unused
*
* No allocation required
*
* Returns 0
*/
-static int smack_key_alloc(struct key *key, struct task_struct *tsk,
+static int smack_key_alloc(struct key *key, const struct cred *cred,
unsigned long flags)
{
- key->security = tsk->cred->security;
+ key->security = cred->security;
return 0;
}
@@ -2382,14 +2393,14 @@ static void smack_key_free(struct key *key)
/*
* smack_key_permission - Smack access on a key
* @key_ref: gets to the object
- * @context: task involved
+ * @cred: the credentials to use
* @perm: unused
*
* Return 0 if the task has read and write to the object,
* an error code otherwise
*/
static int smack_key_permission(key_ref_t key_ref,
- struct task_struct *context, key_perm_t perm)
+ const struct cred *cred, key_perm_t perm)
{
struct key *keyp;
@@ -2405,11 +2416,10 @@ static int smack_key_permission(key_ref_t key_ref,
/*
* This should not occur
*/
- if (context->cred->security == NULL)
+ if (cred->security == NULL)
return -EACCES;
- return smk_access(context->cred->security, keyp->security,
- MAY_READWRITE);
+ return smk_access(cred->security, keyp->security, MAY_READWRITE);
}
#endif /* CONFIG_KEYS */
@@ -2580,8 +2590,7 @@ struct security_operations smack_ops = {
.ptrace_may_access = smack_ptrace_may_access,
.ptrace_traceme = smack_ptrace_traceme,
.capget = cap_capget,
- .capset_check = cap_capset_check,
- .capset_set = cap_capset_set,
+ .capset = cap_capset,
.capable = cap_capable,
.syslog = smack_syslog,
.settime = cap_settime,
@@ -2630,9 +2639,10 @@ struct security_operations smack_ops = {
.file_send_sigiotask = smack_file_send_sigiotask,
.file_receive = smack_file_receive,
- .cred_alloc_security = smack_cred_alloc_security,
.cred_free = smack_cred_free,
- .task_post_setuid = cap_task_post_setuid,
+ .cred_prepare = smack_cred_prepare,
+ .cred_commit = smack_cred_commit,
+ .task_fix_setuid = cap_task_fix_setuid,
.task_setpgid = smack_task_setpgid,
.task_getpgid = smack_task_getpgid,
.task_getsid = smack_task_getsid,
@@ -2645,7 +2655,6 @@ struct security_operations smack_ops = {
.task_movememory = smack_task_movememory,
.task_kill = smack_task_kill,
.task_wait = smack_task_wait,
- .task_reparent_to_init = cap_task_reparent_to_init,
.task_to_inode = smack_task_to_inode,
.task_prctl = cap_task_prctl,
@@ -2721,6 +2730,8 @@ struct security_operations smack_ops = {
*/
static __init int smack_init(void)
{
+ struct cred *cred;
+
if (!security_module_enable(&smack_ops))
return 0;
@@ -2729,7 +2740,8 @@ static __init int smack_init(void)
/*
* Set the security state for the initial task.
*/
- current->cred->security = &smack_known_floor.smk_known;
+ cred = (struct cred *) current->cred;
+ cred->security = &smack_known_floor.smk_known;
/*
* Initialize locks
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