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-rw-r--r--security/smack/smack_access.c4
-rw-r--r--security/smack/smack_lsm.c176
-rw-r--r--security/smack/smackfs.c6
3 files changed, 119 insertions, 67 deletions
diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c
index 79ff21ed4c3b..247cec3b5a43 100644
--- a/security/smack/smack_access.c
+++ b/security/smack/smack_access.c
@@ -164,7 +164,7 @@ int smk_curacc(char *obj_label, u32 mode)
{
int rc;
- rc = smk_access(current->security, obj_label, mode);
+ rc = smk_access(current_security(), obj_label, mode);
if (rc == 0)
return 0;
@@ -173,7 +173,7 @@ int smk_curacc(char *obj_label, u32 mode)
* only one that gets privilege and current does not
* have that label.
*/
- if (smack_onlycap != NULL && smack_onlycap != current->security)
+ if (smack_onlycap != NULL && smack_onlycap != current->cred->security)
return rc;
if (capable(CAP_MAC_OVERRIDE))
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 6e2dc0bab70d..1b5551dfc1f7 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -30,6 +30,8 @@
#include "smack.h"
+#define task_security(task) (task_cred_xxx((task), security))
+
/*
* I hope these are the hokeyist lines of code in the module. Casey.
*/
@@ -102,7 +104,7 @@ static int smack_ptrace_may_access(struct task_struct *ctp, unsigned int mode)
if (rc != 0)
return rc;
- rc = smk_access(current->security, ctp->security, MAY_READWRITE);
+ rc = smk_access(current_security(), task_security(ctp), MAY_READWRITE);
if (rc != 0 && capable(CAP_MAC_OVERRIDE))
return 0;
return rc;
@@ -124,7 +126,7 @@ static int smack_ptrace_traceme(struct task_struct *ptp)
if (rc != 0)
return rc;
- rc = smk_access(ptp->security, current->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;
@@ -141,7 +143,7 @@ static int smack_ptrace_traceme(struct task_struct *ptp)
static int smack_syslog(int type)
{
int rc;
- char *sp = current->security;
+ char *sp = current_security();
rc = cap_syslog(type);
if (rc != 0)
@@ -248,11 +250,12 @@ static int smack_sb_copy_data(char *orig, char *smackopts)
/**
* smack_sb_kern_mount - Smack specific mount processing
* @sb: the file system superblock
+ * @flags: the mount flags
* @data: the smack mount options
*
* Returns 0 on success, an error code on failure
*/
-static int smack_sb_kern_mount(struct super_block *sb, void *data)
+static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
{
struct dentry *root = sb->s_root;
struct inode *inode = root->d_inode;
@@ -373,7 +376,7 @@ static int smack_sb_umount(struct vfsmount *mnt, int flags)
*/
static int smack_inode_alloc_security(struct inode *inode)
{
- inode->i_security = new_inode_smack(current->security);
+ inode->i_security = new_inode_smack(current_security());
if (inode->i_security == NULL)
return -ENOMEM;
return 0;
@@ -818,7 +821,7 @@ static int smack_file_permission(struct file *file, int mask)
*/
static int smack_file_alloc_security(struct file *file)
{
- file->f_security = current->security;
+ file->f_security = current_security();
return 0;
}
@@ -916,7 +919,7 @@ static int smack_file_fcntl(struct file *file, unsigned int cmd,
*/
static int smack_file_set_fowner(struct file *file)
{
- file->f_security = current->security;
+ file->f_security = current_security();
return 0;
}
@@ -941,7 +944,7 @@ static int smack_file_send_sigiotask(struct task_struct *tsk,
* struct fown_struct is never outside the context of a struct file
*/
file = container_of(fown, struct file, f_owner);
- rc = smk_access(file->f_security, tsk->security, MAY_WRITE);
+ rc = smk_access(file->f_security, tsk->cred->security, MAY_WRITE);
if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
return 0;
return rc;
@@ -973,33 +976,75 @@ static int smack_file_receive(struct file *file)
*/
/**
- * smack_task_alloc_security - "allocate" a task blob
- * @tsk: the task in need of a blob
+ * smack_cred_free - "free" task-level security credentials
+ * @cred: the credentials in question
*
* Smack isn't using copies of blobs. Everyone
- * points to an immutable list. No alloc required.
- * No data copy required.
+ * points to an immutable list. The blobs never go away.
+ * There is no leak here.
+ */
+static void smack_cred_free(struct cred *cred)
+{
+ cred->security = NULL;
+}
+
+/**
+ * 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_kernel_act_as - Set the subjective context in a set of credentials
+ * @new points to the set of credentials to be modified.
+ * @secid specifies the security ID to be set
*
- * Always returns 0
+ * Set the security data for a kernel service.
*/
-static int smack_task_alloc_security(struct task_struct *tsk)
+static int smack_kernel_act_as(struct cred *new, u32 secid)
{
- tsk->security = current->security;
+ char *smack = smack_from_secid(secid);
+
+ if (smack == NULL)
+ return -EINVAL;
+ new->security = smack;
return 0;
}
/**
- * smack_task_free_security - "free" a task blob
- * @task: the task with the blob
+ * smack_kernel_create_files_as - Set the file creation label in a set of creds
+ * @new points to the set of credentials to be modified
+ * @inode points to the inode to use as a reference
*
- * Smack isn't using copies of blobs. Everyone
- * points to an immutable list. The blobs never go away.
- * There is no leak here.
+ * Set the file creation context in a set of credentials to the same
+ * as the objective context of the specified inode
*/
-static void smack_task_free_security(struct task_struct *task)
+static int smack_kernel_create_files_as(struct cred *new,
+ struct inode *inode)
{
- task->security = NULL;
+ struct inode_smack *isp = inode->i_security;
+
+ new->security = isp->smk_inode;
+ return 0;
}
/**
@@ -1011,7 +1056,7 @@ static void smack_task_free_security(struct task_struct *task)
*/
static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
{
- return smk_curacc(p->security, MAY_WRITE);
+ return smk_curacc(task_security(p), MAY_WRITE);
}
/**
@@ -1022,7 +1067,7 @@ static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
*/
static int smack_task_getpgid(struct task_struct *p)
{
- return smk_curacc(p->security, MAY_READ);
+ return smk_curacc(task_security(p), MAY_READ);
}
/**
@@ -1033,7 +1078,7 @@ static int smack_task_getpgid(struct task_struct *p)
*/
static int smack_task_getsid(struct task_struct *p)
{
- return smk_curacc(p->security, MAY_READ);
+ return smk_curacc(task_security(p), MAY_READ);
}
/**
@@ -1045,7 +1090,7 @@ static int smack_task_getsid(struct task_struct *p)
*/
static void smack_task_getsecid(struct task_struct *p, u32 *secid)
{
- *secid = smack_to_secid(p->security);
+ *secid = smack_to_secid(task_security(p));
}
/**
@@ -1061,7 +1106,7 @@ static int smack_task_setnice(struct task_struct *p, int nice)
rc = cap_task_setnice(p, nice);
if (rc == 0)
- rc = smk_curacc(p->security, MAY_WRITE);
+ rc = smk_curacc(task_security(p), MAY_WRITE);
return rc;
}
@@ -1078,7 +1123,7 @@ static int smack_task_setioprio(struct task_struct *p, int ioprio)
rc = cap_task_setioprio(p, ioprio);
if (rc == 0)
- rc = smk_curacc(p->security, MAY_WRITE);
+ rc = smk_curacc(task_security(p), MAY_WRITE);
return rc;
}
@@ -1090,7 +1135,7 @@ static int smack_task_setioprio(struct task_struct *p, int ioprio)
*/
static int smack_task_getioprio(struct task_struct *p)
{
- return smk_curacc(p->security, MAY_READ);
+ return smk_curacc(task_security(p), MAY_READ);
}
/**
@@ -1108,7 +1153,7 @@ static int smack_task_setscheduler(struct task_struct *p, int policy,
rc = cap_task_setscheduler(p, policy, lp);
if (rc == 0)
- rc = smk_curacc(p->security, MAY_WRITE);
+ rc = smk_curacc(task_security(p), MAY_WRITE);
return rc;
}
@@ -1120,7 +1165,7 @@ static int smack_task_setscheduler(struct task_struct *p, int policy,
*/
static int smack_task_getscheduler(struct task_struct *p)
{
- return smk_curacc(p->security, MAY_READ);
+ return smk_curacc(task_security(p), MAY_READ);
}
/**
@@ -1131,7 +1176,7 @@ static int smack_task_getscheduler(struct task_struct *p)
*/
static int smack_task_movememory(struct task_struct *p)
{
- return smk_curacc(p->security, MAY_WRITE);
+ return smk_curacc(task_security(p), MAY_WRITE);
}
/**
@@ -1154,13 +1199,13 @@ static int smack_task_kill(struct task_struct *p, struct siginfo *info,
* can write the receiver.
*/
if (secid == 0)
- return smk_curacc(p->security, MAY_WRITE);
+ return smk_curacc(task_security(p), MAY_WRITE);
/*
* If the secid isn't 0 we're dealing with some USB IO
* specific behavior. This is not clean. For one thing
* we can't take privilege into account.
*/
- return smk_access(smack_from_secid(secid), p->security, MAY_WRITE);
+ return smk_access(smack_from_secid(secid), task_security(p), MAY_WRITE);
}
/**
@@ -1173,7 +1218,7 @@ static int smack_task_wait(struct task_struct *p)
{
int rc;
- rc = smk_access(current->security, p->security, MAY_WRITE);
+ rc = smk_access(current_security(), task_security(p), MAY_WRITE);
if (rc == 0)
return 0;
@@ -1204,7 +1249,7 @@ static int smack_task_wait(struct task_struct *p)
static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
{
struct inode_smack *isp = inode->i_security;
- isp->smk_inode = p->security;
+ isp->smk_inode = task_security(p);
}
/*
@@ -1223,7 +1268,7 @@ static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
*/
static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
{
- char *csp = current->security;
+ char *csp = current_security();
struct socket_smack *ssp;
ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
@@ -1448,7 +1493,7 @@ static int smack_flags_to_may(int flags)
*/
static int smack_msg_msg_alloc_security(struct msg_msg *msg)
{
- msg->security = current->security;
+ msg->security = current_security();
return 0;
}
@@ -1484,7 +1529,7 @@ static int smack_shm_alloc_security(struct shmid_kernel *shp)
{
struct kern_ipc_perm *isp = &shp->shm_perm;
- isp->security = current->security;
+ isp->security = current_security();
return 0;
}
@@ -1593,7 +1638,7 @@ static int smack_sem_alloc_security(struct sem_array *sma)
{
struct kern_ipc_perm *isp = &sma->sem_perm;
- isp->security = current->security;
+ isp->security = current_security();
return 0;
}
@@ -1697,7 +1742,7 @@ static int smack_msg_queue_alloc_security(struct msg_queue *msq)
{
struct kern_ipc_perm *kisp = &msq->q_perm;
- kisp->security = current->security;
+ kisp->security = current_security();
return 0;
}
@@ -1852,7 +1897,7 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
struct super_block *sbp;
struct superblock_smack *sbsp;
struct inode_smack *isp;
- char *csp = current->security;
+ char *csp = current_security();
char *fetched;
char *final;
struct dentry *dp;
@@ -2009,7 +2054,7 @@ static int smack_getprocattr(struct task_struct *p, char *name, char **value)
if (strcmp(name, "current") != 0)
return -EINVAL;
- cp = kstrdup(p->security, GFP_KERNEL);
+ cp = kstrdup(task_security(p), GFP_KERNEL);
if (cp == NULL)
return -ENOMEM;
@@ -2033,6 +2078,7 @@ 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;
/*
@@ -2055,7 +2101,11 @@ static int smack_setprocattr(struct task_struct *p, char *name,
if (newsmack == NULL)
return -EINVAL;
- p->security = newsmack;
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+ new->security = newsmack;
+ commit_creds(new);
return size;
}
@@ -2288,8 +2338,7 @@ static void smack_sock_graft(struct sock *sk, struct socket *parent)
return;
ssp = sk->sk_security;
- ssp->smk_in = current->security;
- ssp->smk_out = current->security;
+ ssp->smk_in = ssp->smk_out = current_security();
ssp->smk_packet[0] = '\0';
rc = smack_netlabel(sk);
@@ -2352,17 +2401,17 @@ 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->security;
+ key->security = cred->security;
return 0;
}
@@ -2380,14 +2429,14 @@ 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;
@@ -2403,10 +2452,10 @@ static int smack_key_permission(key_ref_t key_ref,
/*
* This should not occur
*/
- if (context->security == NULL)
+ if (cred->security == NULL)
return -EACCES;
- return smk_access(context->security, keyp->security, MAY_READWRITE);
+ return smk_access(cred->security, keyp->security, MAY_READWRITE);
}
#endif /* CONFIG_KEYS */
@@ -2577,15 +2626,13 @@ 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,
.vm_enough_memory = cap_vm_enough_memory,
- .bprm_apply_creds = cap_bprm_apply_creds,
- .bprm_set_security = cap_bprm_set_security,
+ .bprm_set_creds = cap_bprm_set_creds,
.bprm_secureexec = cap_bprm_secureexec,
.sb_alloc_security = smack_sb_alloc_security,
@@ -2627,9 +2674,12 @@ struct security_operations smack_ops = {
.file_send_sigiotask = smack_file_send_sigiotask,
.file_receive = smack_file_receive,
- .task_alloc_security = smack_task_alloc_security,
- .task_free_security = smack_task_free_security,
- .task_post_setuid = cap_task_post_setuid,
+ .cred_free = smack_cred_free,
+ .cred_prepare = smack_cred_prepare,
+ .cred_commit = smack_cred_commit,
+ .kernel_act_as = smack_kernel_act_as,
+ .kernel_create_files_as = smack_kernel_create_files_as,
+ .task_fix_setuid = cap_task_fix_setuid,
.task_setpgid = smack_task_setpgid,
.task_getpgid = smack_task_getpgid,
.task_getsid = smack_task_getsid,
@@ -2642,7 +2692,6 @@ 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,
@@ -2718,6 +2767,8 @@ struct security_operations smack_ops = {
*/
static __init int smack_init(void)
{
+ struct cred *cred;
+
if (!security_module_enable(&smack_ops))
return 0;
@@ -2726,7 +2777,8 @@ static __init int smack_init(void)
/*
* Set the security state for the initial task.
*/
- current->security = &smack_known_floor.smk_known;
+ cred = (struct cred *) current->cred;
+ cred->security = &smack_known_floor.smk_known;
/*
* Initialize locks
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index c21d8c8bf0c7..ca257dfdc75d 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -336,7 +336,7 @@ static void smk_cipso_doi(void)
audit_info.loginuid = audit_get_loginuid(current);
audit_info.sessionid = audit_get_sessionid(current);
- audit_info.secid = smack_to_secid(current->security);
+ audit_info.secid = smack_to_secid(current_security());
rc = netlbl_cfg_map_del(NULL, &audit_info);
if (rc != 0)
@@ -371,7 +371,7 @@ static void smk_unlbl_ambient(char *oldambient)
audit_info.loginuid = audit_get_loginuid(current);
audit_info.sessionid = audit_get_sessionid(current);
- audit_info.secid = smack_to_secid(current->security);
+ audit_info.secid = smack_to_secid(current_security());
if (oldambient != NULL) {
rc = netlbl_cfg_map_del(oldambient, &audit_info);
@@ -843,7 +843,7 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
char in[SMK_LABELLEN];
- char *sp = current->security;
+ char *sp = current->cred->security;
if (!capable(CAP_MAC_ADMIN))
return -EPERM;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 19:54:13 +0000