aboutsummaryrefslogtreecommitdiff
path: root/security/smack
diff options
context:
space:
mode:
Diffstat (limited to 'security/smack')
-rw-r--r--security/smack/smack.h9
-rw-r--r--security/smack/smack_access.c52
-rw-r--r--security/smack/smack_lsm.c269
-rw-r--r--security/smack/smackfs.c370
4 files changed, 522 insertions, 178 deletions
diff --git a/security/smack/smack.h b/security/smack/smack.h
index 129c4eb8ffb1..e365d455ceb6 100644
--- a/security/smack/smack.h
+++ b/security/smack/smack.h
@@ -52,13 +52,16 @@ struct socket_smack {
struct inode_smack {
char *smk_inode; /* label of the fso */
char *smk_task; /* label of the task */
+ char *smk_mmap; /* label of the mmap domain */
struct mutex smk_lock; /* initialization lock */
int smk_flags; /* smack inode flags */
};
struct task_smack {
- char *smk_task; /* label used for access control */
- char *smk_forked; /* label when forked */
+ char *smk_task; /* label for access control */
+ char *smk_forked; /* label when forked */
+ struct list_head smk_rules; /* per task access rules */
+ struct mutex smk_rules_lock; /* lock for the rules */
};
#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
@@ -202,7 +205,7 @@ struct inode_smack *new_inode_smack(char *);
/*
* These functions are in smack_access.c
*/
-int smk_access_entry(char *, char *);
+int smk_access_entry(char *, char *, struct list_head *);
int smk_access(char *, char *, int, struct smk_audit_info *);
int smk_curacc(char *, u32, struct smk_audit_info *);
int smack_to_cipso(const char *, struct smack_cipso *);
diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c
index 7ba8478f599e..86453db4333d 100644
--- a/security/smack/smack_access.c
+++ b/security/smack/smack_access.c
@@ -70,10 +70,11 @@ int log_policy = SMACK_AUDIT_DENIED;
* smk_access_entry - look up matching access rule
* @subject_label: a pointer to the subject's Smack label
* @object_label: a pointer to the object's Smack label
+ * @rule_list: the list of rules to search
*
* This function looks up the subject/object pair in the
- * access rule list and returns pointer to the matching rule if found,
- * NULL otherwise.
+ * access rule list and returns the access mode. If no
+ * entry is found returns -ENOENT.
*
* NOTE:
* Even though Smack labels are usually shared on smack_list
@@ -85,13 +86,13 @@ int log_policy = SMACK_AUDIT_DENIED;
* will be on the list, so checking the pointers may be a worthwhile
* optimization.
*/
-int smk_access_entry(char *subject_label, char *object_label)
+int smk_access_entry(char *subject_label, char *object_label,
+ struct list_head *rule_list)
{
- u32 may = MAY_NOT;
+ int may = -ENOENT;
struct smack_rule *srp;
- rcu_read_lock();
- list_for_each_entry_rcu(srp, &smack_rule_list, list) {
+ list_for_each_entry_rcu(srp, rule_list, list) {
if (srp->smk_subject == subject_label ||
strcmp(srp->smk_subject, subject_label) == 0) {
if (srp->smk_object == object_label ||
@@ -101,7 +102,6 @@ int smk_access_entry(char *subject_label, char *object_label)
}
}
}
- rcu_read_unlock();
return may;
}
@@ -129,7 +129,7 @@ int smk_access_entry(char *subject_label, char *object_label)
int smk_access(char *subject_label, char *object_label, int request,
struct smk_audit_info *a)
{
- u32 may = MAY_NOT;
+ int may = MAY_NOT;
int rc = 0;
/*
@@ -181,13 +181,14 @@ int smk_access(char *subject_label, char *object_label, int request,
* Beyond here an explicit relationship is required.
* If the requested access is contained in the available
* access (e.g. read is included in readwrite) it's
- * good.
- */
- may = smk_access_entry(subject_label, object_label);
- /*
- * This is a bit map operation.
+ * good. A negative response from smk_access_entry()
+ * indicates there is no entry for this pair.
*/
- if ((request & may) == request)
+ rcu_read_lock();
+ may = smk_access_entry(subject_label, object_label, &smack_rule_list);
+ rcu_read_unlock();
+
+ if (may > 0 && (request & may) == request)
goto out_audit;
rc = -EACCES;
@@ -212,12 +213,27 @@ out_audit:
*/
int smk_curacc(char *obj_label, u32 mode, struct smk_audit_info *a)
{
+ struct task_smack *tsp = current_security();
+ char *sp = smk_of_task(tsp);
+ int may;
int rc;
- char *sp = smk_of_current();
+ /*
+ * Check the global rule list
+ */
rc = smk_access(sp, obj_label, mode, NULL);
- if (rc == 0)
- goto out_audit;
+ if (rc == 0) {
+ /*
+ * If there is an entry in the task's rule list
+ * it can further restrict access.
+ */
+ may = smk_access_entry(sp, obj_label, &tsp->smk_rules);
+ if (may < 0)
+ goto out_audit;
+ if ((mode & may) == mode)
+ goto out_audit;
+ rc = -EACCES;
+ }
/*
* Return if a specific label has been designated as the
@@ -228,7 +244,7 @@ int smk_curacc(char *obj_label, u32 mode, struct smk_audit_info *a)
goto out_audit;
if (capable(CAP_MAC_OVERRIDE))
- return 0;
+ rc = 0;
out_audit:
#ifdef CONFIG_AUDIT
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 533bf3255d7f..123a499ded37 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -84,6 +84,56 @@ struct inode_smack *new_inode_smack(char *smack)
return isp;
}
+/**
+ * new_task_smack - allocate a task security blob
+ * @smack: a pointer to the Smack label to use in the blob
+ *
+ * Returns the new blob or NULL if there's no memory available
+ */
+static struct task_smack *new_task_smack(char *task, char *forked, gfp_t gfp)
+{
+ struct task_smack *tsp;
+
+ tsp = kzalloc(sizeof(struct task_smack), gfp);
+ if (tsp == NULL)
+ return NULL;
+
+ tsp->smk_task = task;
+ tsp->smk_forked = forked;
+ INIT_LIST_HEAD(&tsp->smk_rules);
+ mutex_init(&tsp->smk_rules_lock);
+
+ return tsp;
+}
+
+/**
+ * smk_copy_rules - copy a rule set
+ * @nhead - new rules header pointer
+ * @ohead - old rules header pointer
+ *
+ * Returns 0 on success, -ENOMEM on error
+ */
+static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
+ gfp_t gfp)
+{
+ struct smack_rule *nrp;
+ struct smack_rule *orp;
+ int rc = 0;
+
+ INIT_LIST_HEAD(nhead);
+
+ list_for_each_entry_rcu(orp, ohead, list) {
+ nrp = kzalloc(sizeof(struct smack_rule), gfp);
+ if (nrp == NULL) {
+ rc = -ENOMEM;
+ break;
+ }
+ *nrp = *orp;
+ list_add_rcu(&nrp->list, nhead);
+ }
+ return rc;
+}
+
/*
* LSM hooks.
* We he, that is fun!
@@ -102,23 +152,17 @@ static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
{
int rc;
struct smk_audit_info ad;
- char *sp, *tsp;
+ char *tsp;
rc = cap_ptrace_access_check(ctp, mode);
if (rc != 0)
return rc;
- sp = smk_of_current();
tsp = smk_of_task(task_security(ctp));
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, ctp);
- /* we won't log here, because rc can be overriden */
- rc = smk_access(sp, tsp, MAY_READWRITE, NULL);
- if (rc != 0 && capable(CAP_MAC_OVERRIDE))
- rc = 0;
-
- smack_log(sp, tsp, MAY_READWRITE, rc, &ad);
+ rc = smk_curacc(tsp, MAY_READWRITE, &ad);
return rc;
}
@@ -134,23 +178,17 @@ static int smack_ptrace_traceme(struct task_struct *ptp)
{
int rc;
struct smk_audit_info ad;
- char *sp, *tsp;
+ char *tsp;
rc = cap_ptrace_traceme(ptp);
if (rc != 0)
return rc;
+ tsp = smk_of_task(task_security(ptp));
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, ptp);
- sp = smk_of_current();
- tsp = smk_of_task(task_security(ptp));
- /* we won't log here, because rc can be overriden */
- rc = smk_access(tsp, sp, MAY_READWRITE, NULL);
- if (rc != 0 && has_capability(ptp, CAP_MAC_OVERRIDE))
- rc = 0;
-
- smack_log(tsp, sp, MAY_READWRITE, rc, &ad);
+ rc = smk_curacc(tsp, MAY_READWRITE, &ad);
return rc;
}
@@ -474,7 +512,7 @@ static int smack_inode_init_security(struct inode *inode, struct inode *dir,
{
char *isp = smk_of_inode(inode);
char *dsp = smk_of_inode(dir);
- u32 may;
+ int may;
if (name) {
*name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL);
@@ -483,14 +521,17 @@ static int smack_inode_init_security(struct inode *inode, struct inode *dir,
}
if (value) {
- may = smk_access_entry(smk_of_current(), dsp);
+ rcu_read_lock();
+ may = smk_access_entry(smk_of_current(), dsp, &smack_rule_list);
+ rcu_read_unlock();
/*
* If the access rule allows transmutation and
* the directory requests transmutation then
* by all means transmute.
*/
- if (((may & MAY_TRANSMUTE) != 0) && smk_inode_transmutable(dir))
+ if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
+ smk_inode_transmutable(dir))
isp = dsp;
*value = kstrdup(isp, GFP_KERNEL);
@@ -716,7 +757,8 @@ static int smack_inode_setxattr(struct dentry *dentry, const char *name,
if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
- strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
+ strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
+ strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
if (!capable(CAP_MAC_ADMIN))
rc = -EPERM;
/*
@@ -773,6 +815,12 @@ static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
isp->smk_task = nsp;
else
isp->smk_task = smack_known_invalid.smk_known;
+ } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
+ nsp = smk_import(value, size);
+ if (nsp != NULL)
+ isp->smk_mmap = nsp;
+ else
+ isp->smk_mmap = smack_known_invalid.smk_known;
} else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
isp->smk_flags |= SMK_INODE_TRANSMUTE;
@@ -815,7 +863,8 @@ static int smack_inode_removexattr(struct dentry *dentry, const char *name)
strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
- strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
+ strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
+ strcmp(name, XATTR_NAME_SMACKMMAP)) {
if (!capable(CAP_MAC_ADMIN))
rc = -EPERM;
} else
@@ -829,6 +878,7 @@ static int smack_inode_removexattr(struct dentry *dentry, const char *name)
if (rc == 0) {
isp = dentry->d_inode->i_security;
isp->smk_task = NULL;
+ isp->smk_mmap = NULL;
}
return rc;
@@ -1060,6 +1110,113 @@ static int smack_file_fcntl(struct file *file, unsigned int cmd,
}
/**
+ * smk_mmap_list_check - the mmap check
+ * @sub: subject label
+ * @obj: object label
+ * @access: access mode
+ * @local: the task specific rule list
+ *
+ * Returns 0 if acces is permitted, -EACCES otherwise
+ */
+static int smk_mmap_list_check(char *sub, char *obj, int access,
+ struct list_head *local)
+{
+ int may;
+
+ /*
+ * If there is not a global rule that
+ * allows access say no.
+ */
+ may = smk_access_entry(sub, obj, &smack_rule_list);
+ if (may == -ENOENT || (may & access) != access)
+ return -EACCES;
+ /*
+ * If there is a task local rule that
+ * denies access say no.
+ */
+ may = smk_access_entry(sub, obj, local);
+ if (may != -ENOENT && (may & access) != access)
+ return -EACCES;
+
+ return 0;
+}
+
+/**
+ * smack_file_mmap :
+ * Check permissions for a mmap operation. The @file may be NULL, e.g.
+ * if mapping anonymous memory.
+ * @file contains the file structure for file to map (may be NULL).
+ * @reqprot contains the protection requested by the application.
+ * @prot contains the protection that will be applied by the kernel.
+ * @flags contains the operational flags.
+ * Return 0 if permission is granted.
+ */
+static int smack_file_mmap(struct file *file,
+ unsigned long reqprot, unsigned long prot,
+ unsigned long flags, unsigned long addr,
+ unsigned long addr_only)
+{
+ struct smack_rule *srp;
+ struct task_smack *tsp;
+ char *sp;
+ char *msmack;
+ struct inode_smack *isp;
+ struct dentry *dp;
+ int rc;
+
+ /* do DAC check on address space usage */
+ rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only);
+ if (rc || addr_only)
+ return rc;
+
+ if (file == NULL || file->f_dentry == NULL)
+ return 0;
+
+ dp = file->f_dentry;
+
+ if (dp->d_inode == NULL)
+ return 0;
+
+ isp = dp->d_inode->i_security;
+ if (isp->smk_mmap == NULL)
+ return 0;
+ msmack = isp->smk_mmap;
+
+ tsp = current_security();
+ sp = smk_of_current();
+ rc = 0;
+
+ rcu_read_lock();
+ /*
+ * For each Smack rule associated with the subject
+ * label verify that the SMACK64MMAP also has access
+ * to that rule's object label.
+ *
+ * Because neither of the labels comes
+ * from the networking code it is sufficient
+ * to compare pointers.
+ */
+ list_for_each_entry_rcu(srp, &smack_rule_list, list) {
+ if (srp->smk_subject != sp)
+ continue;
+ /*
+ * Matching labels always allows access.
+ */
+ if (msmack == srp->smk_object)
+ continue;
+
+ rc = smk_mmap_list_check(msmack, srp->smk_object,
+ srp->smk_access, &tsp->smk_rules);
+ if (rc != 0)
+ break;
+ }
+
+ rcu_read_unlock();
+
+ return rc;
+}
+
+/**
* smack_file_set_fowner - set the file security blob value
* @file: object in question
*
@@ -1095,6 +1252,7 @@ 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);
+
/* we don't log here as rc can be overriden */
rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL);
if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
@@ -1145,9 +1303,14 @@ static int smack_file_receive(struct file *file)
*/
static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
{
- cred->security = kzalloc(sizeof(struct task_smack), gfp);
- if (cred->security == NULL)
+ struct task_smack *tsp;
+
+ tsp = new_task_smack(NULL, NULL, gfp);
+ if (tsp == NULL)
return -ENOMEM;
+
+ cred->security = tsp;
+
return 0;
}
@@ -1156,13 +1319,24 @@ static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
* 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. The blobs never go away.
- * There is no leak here.
*/
static void smack_cred_free(struct cred *cred)
{
- kfree(cred->security);
+ struct task_smack *tsp = cred->security;
+ struct smack_rule *rp;
+ struct list_head *l;
+ struct list_head *n;
+
+ if (tsp == NULL)
+ return;
+ cred->security = NULL;
+
+ list_for_each_safe(l, n, &tsp->smk_rules) {
+ rp = list_entry(l, struct smack_rule, list);
+ list_del(&rp->list);
+ kfree(rp);
+ }
+ kfree(tsp);
}
/**
@@ -1178,13 +1352,16 @@ static int smack_cred_prepare(struct cred *new, const struct cred *old,
{
struct task_smack *old_tsp = old->security;
struct task_smack *new_tsp;
+ int rc;
- new_tsp = kzalloc(sizeof(struct task_smack), gfp);
+ new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
if (new_tsp == NULL)
return -ENOMEM;
- new_tsp->smk_task = old_tsp->smk_task;
- new_tsp->smk_forked = old_tsp->smk_task;
+ rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
+ if (rc != 0)
+ return rc;
+
new->security = new_tsp;
return 0;
}
@@ -1203,6 +1380,11 @@ static void smack_cred_transfer(struct cred *new, const struct cred *old)
new_tsp->smk_task = old_tsp->smk_task;
new_tsp->smk_forked = old_tsp->smk_task;
+ mutex_init(&new_tsp->smk_rules_lock);
+ INIT_LIST_HEAD(&new_tsp->smk_rules);
+
+
+ /* cbs copy rule list */
}
/**
@@ -2419,6 +2601,7 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
}
}
isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
+ isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
dput(dp);
break;
@@ -2478,6 +2661,7 @@ 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)
{
+ int rc;
struct task_smack *tsp;
struct task_smack *oldtsp;
struct cred *new;
@@ -2513,13 +2697,16 @@ static int smack_setprocattr(struct task_struct *p, char *name,
new = prepare_creds();
if (new == NULL)
return -ENOMEM;
- tsp = kzalloc(sizeof(struct task_smack), GFP_KERNEL);
+
+ tsp = new_task_smack(newsmack, oldtsp->smk_forked, GFP_KERNEL);
if (tsp == NULL) {
kfree(new);
return -ENOMEM;
}
- tsp->smk_task = newsmack;
- tsp->smk_forked = oldtsp->smk_forked;
+ rc = smk_copy_rules(&tsp->smk_rules, &oldtsp->smk_rules, GFP_KERNEL);
+ if (rc != 0)
+ return rc;
+
new->security = tsp;
commit_creds(new);
return size;
@@ -3221,6 +3408,7 @@ struct security_operations smack_ops = {
.file_ioctl = smack_file_ioctl,
.file_lock = smack_file_lock,
.file_fcntl = smack_file_fcntl,
+ .file_mmap = smack_file_mmap,
.file_set_fowner = smack_file_set_fowner,
.file_send_sigiotask = smack_file_send_sigiotask,
.file_receive = smack_file_receive,
@@ -3334,23 +3522,20 @@ static __init int smack_init(void)
struct cred *cred;
struct task_smack *tsp;
- tsp = kzalloc(sizeof(struct task_smack), GFP_KERNEL);
+ if (!security_module_enable(&smack_ops))
+ return 0;
+
+ tsp = new_task_smack(smack_known_floor.smk_known,
+ smack_known_floor.smk_known, GFP_KERNEL);
if (tsp == NULL)
return -ENOMEM;
- if (!security_module_enable(&smack_ops)) {
- kfree(tsp);
- return 0;
- }
-
printk(KERN_INFO "Smack: Initializing.\n");
/*
* Set the security state for the initial task.
*/
cred = (struct cred *) current->cred;
- tsp->smk_forked = smack_known_floor.smk_known;
- tsp->smk_task = smack_known_floor.smk_known;
cred->security = tsp;
/* initialize the smack_know_list */
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 362d5eda948b..90d1bbaaa6f3 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -43,6 +43,7 @@ enum smk_inos {
SMK_NETLBLADDR = 8, /* single label hosts */
SMK_ONLYCAP = 9, /* the only "capable" label */
SMK_LOGGING = 10, /* logging */
+ SMK_LOAD_SELF = 11, /* task specific rules */
};
/*
@@ -135,104 +136,30 @@ static void smk_netlabel_audit_set(struct netlbl_audit *nap)
#define SMK_NETLBLADDRMIN 9
#define SMK_NETLBLADDRMAX 42
-/*
- * Seq_file read operations for /smack/load
- */
-
-static void *load_seq_start(struct seq_file *s, loff_t *pos)
-{
- if (*pos == SEQ_READ_FINISHED)
- return NULL;
- if (list_empty(&smack_rule_list))
- return NULL;
- return smack_rule_list.next;
-}
-
-static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
-{
- struct list_head *list = v;
-
- if (list_is_last(list, &smack_rule_list)) {
- *pos = SEQ_READ_FINISHED;
- return NULL;
- }
- return list->next;
-}
-
-static int load_seq_show(struct seq_file *s, void *v)
-{
- struct list_head *list = v;
- struct smack_rule *srp =
- list_entry(list, struct smack_rule, list);
-
- seq_printf(s, "%s %s", (char *)srp->smk_subject,
- (char *)srp->smk_object);
-
- seq_putc(s, ' ');
-
- if (srp->smk_access & MAY_READ)
- seq_putc(s, 'r');
- if (srp->smk_access & MAY_WRITE)
- seq_putc(s, 'w');
- if (srp->smk_access & MAY_EXEC)
- seq_putc(s, 'x');
- if (srp->smk_access & MAY_APPEND)
- seq_putc(s, 'a');
- if (srp->smk_access & MAY_TRANSMUTE)
- seq_putc(s, 't');
- if (srp->smk_access == 0)
- seq_putc(s, '-');
-
- seq_putc(s, '\n');
-
- return 0;
-}
-
-static void load_seq_stop(struct seq_file *s, void *v)
-{
- /* No-op */
-}
-
-static const struct seq_operations load_seq_ops = {
- .start = load_seq_start,
- .next = load_seq_next,
- .show = load_seq_show,
- .stop = load_seq_stop,
-};
-
-/**
- * smk_open_load - open() for /smack/load
- * @inode: inode structure representing file
- * @file: "load" file pointer
- *
- * For reading, use load_seq_* seq_file reading operations.
- */
-static int smk_open_load(struct inode *inode, struct file *file)
-{
- return seq_open(file, &load_seq_ops);
-}
-
/**
* smk_set_access - add a rule to the rule list
* @srp: the new rule to add
+ * @rule_list: the list of rules
+ * @rule_lock: the rule list lock
*
* Looks through the current subject/object/access list for
* the subject/object pair and replaces the access that was
* there. If the pair isn't found add it with the specified
* access.
*
+ * Returns 1 if a rule was found to exist already, 0 if it is new
* Returns 0 if nothing goes wrong or -ENOMEM if it fails
* during the allocation of the new pair to add.
*/
-static int smk_set_access(struct smack_rule *srp)
+static int smk_set_access(struct smack_rule *srp, struct list_head *rule_list,
+ struct mutex *rule_lock)
{
struct smack_rule *sp;
- int ret = 0;
- int found;
- mutex_lock(&smack_list_lock);
+ int found = 0;
- found = 0;
- list_for_each_entry_rcu(sp, &smack_rule_list, list) {
+ mutex_lock(rule_lock);
+
+ list_for_each_entry_rcu(sp, rule_list, list) {
if (sp->smk_subject == srp->smk_subject &&
sp->smk_object == srp->smk_object) {
found = 1;
@@ -241,19 +168,21 @@ static int smk_set_access(struct smack_rule *srp)
}
}
if (found == 0)
- list_add_rcu(&srp->list, &smack_rule_list);
+ list_add_rcu(&srp->list, rule_list);
- mutex_unlock(&smack_list_lock);
+ mutex_unlock(rule_lock);
- return ret;
+ return found;
}
/**
- * smk_write_load - write() for /smack/load
+ * smk_write_load_list - write() for any /smack/load
* @file: file pointer, not actually used
* @buf: where to get the data from
* @count: bytes sent
* @ppos: where to start - must be 0
+ * @rule_list: the list of rules to write to
+ * @rule_lock: lock for the rule list
*
* Get one smack access rule from above.
* The format is exactly:
@@ -263,21 +192,19 @@ static int smk_set_access(struct smack_rule *srp)
*
* writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes.
*/
-static ssize_t smk_write_load(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
+static ssize_t smk_write_load_list(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos,
+ struct list_head *rule_list,
+ struct mutex *rule_lock)
{
struct smack_rule *rule;
char *data;
int rc = -EINVAL;
/*
- * Must have privilege.
* No partial writes.
* Enough data must be present.
*/
- if (!capable(CAP_MAC_ADMIN))
- return -EPERM;
-
if (*ppos != 0)
return -EINVAL;
/*
@@ -372,11 +299,13 @@ static ssize_t smk_write_load(struct file *file, const char __user *buf,
goto out_free_rule;
}
- rc = smk_set_access(rule);
-
- if (!rc)
- rc = count;
- goto out;
+ rc = count;
+ /*
+ * smk_set_access returns true if there was already a rule
+ * for the subject/object pair, and false if it was new.
+ */
+ if (!smk_set_access(rule, rule_list, rule_lock))
+ goto out;
out_free_rule:
kfree(rule);
@@ -385,6 +314,108 @@ out:
return rc;
}
+
+/*
+ * Seq_file read operations for /smack/load
+ */
+
+static void *load_seq_start(struct seq_file *s, loff_t *pos)
+{
+ if (*pos == SEQ_READ_FINISHED)
+ return NULL;
+ if (list_empty(&smack_rule_list))
+ return NULL;
+ return smack_rule_list.next;
+}
+
+static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ struct list_head *list = v;
+
+ if (list_is_last(list, &smack_rule_list)) {
+ *pos = SEQ_READ_FINISHED;
+ return NULL;
+ }
+ return list->next;
+}
+
+static int load_seq_show(struct seq_file *s, void *v)
+{
+ struct list_head *list = v;
+ struct smack_rule *srp =
+ list_entry(list, struct smack_rule, list);
+
+ seq_printf(s, "%s %s", (char *)srp->smk_subject,
+ (char *)srp->smk_object);
+
+ seq_putc(s, ' ');
+
+ if (srp->smk_access & MAY_READ)
+ seq_putc(s, 'r');
+ if (srp->smk_access & MAY_WRITE)
+ seq_putc(s, 'w');
+ if (srp->smk_access & MAY_EXEC)
+ seq_putc(s, 'x');
+ if (srp->smk_access & MAY_APPEND)
+ seq_putc(s, 'a');
+ if (srp->smk_access & MAY_TRANSMUTE)
+ seq_putc(s, 't');
+ if (srp->smk_access == 0)
+ seq_putc(s, '-');
+
+ seq_putc(s, '\n');
+
+ return 0;
+}
+
+static void load_seq_stop(struct seq_file *s, void *v)
+{
+ /* No-op */
+}
+
+static const struct seq_operations load_seq_ops = {
+ .start = load_seq_start,
+ .next = load_seq_next,
+ .show = load_seq_show,
+ .stop = load_seq_stop,
+};
+
+/**
+ * smk_open_load - open() for /smack/load
+ * @inode: inode structure representing file
+ * @file: "load" file pointer
+ *
+ * For reading, use load_seq_* seq_file reading operations.
+ */
+static int smk_open_load(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &load_seq_ops);
+}
+
+/**
+ * smk_write_load - write() for /smack/load
+ * @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_load(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+
+ /*
+ * Must have privilege.
+ * No partial writes.
+ * Enough data must be present.
+ */
+ if (!capable(CAP_MAC_ADMIN))
+ return -EPERM;
+
+ return smk_write_load_list(file, buf, count, ppos, &smack_rule_list,
+ &smack_list_lock);
+}
+
static const struct file_operations smk_load_ops = {
.open = smk_open_load,
.read = seq_read,
@@ -1288,6 +1319,112 @@ static const struct file_operations smk_logging_ops = {
.write = smk_write_logging,
.llseek = default_llseek,
};
+
+/*
+ * Seq_file read operations for /smack/load-self
+ */
+
+static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
+{
+ struct task_smack *tsp = current_security();
+
+ if (*pos == SEQ_READ_FINISHED)
+ return NULL;
+ if (list_empty(&tsp->smk_rules))
+ return NULL;
+ return tsp->smk_rules.next;
+}
+
+static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ struct task_smack *tsp = current_security();
+ struct list_head *list = v;
+
+ if (list_is_last(list, &tsp->smk_rules)) {
+ *pos = SEQ_READ_FINISHED;
+ return NULL;
+ }
+ return list->next;
+}
+
+static int load_self_seq_show(struct seq_file *s, void *v)
+{
+ struct list_head *list = v;
+ struct smack_rule *srp =
+ list_entry(list, struct smack_rule, list);
+
+ seq_printf(s, "%s %s", (char *)srp->smk_subject,
+ (char *)srp->smk_object);
+
+ seq_putc(s, ' ');
+
+ if (srp->smk_access & MAY_READ)
+ seq_putc(s, 'r');
+ if (srp->smk_access & MAY_WRITE)
+ seq_putc(s, 'w');
+ if (srp->smk_access & MAY_EXEC)
+ seq_putc(s, 'x');
+ if (srp->smk_access & MAY_APPEND)
+ seq_putc(s, 'a');
+ if (srp->smk_access & MAY_TRANSMUTE)
+ seq_putc(s, 't');
+ if (srp->smk_access == 0)
+ seq_putc(s, '-');
+
+ seq_putc(s, '\n');
+
+ return 0;
+}
+
+static void load_self_seq_stop(struct seq_file *s, void *v)
+{
+ /* No-op */
+}
+
+static const struct seq_operations load_self_seq_ops = {
+ .start = load_self_seq_start,
+ .next = load_self_seq_next,
+ .show = load_self_seq_show,
+ .stop = load_self_seq_stop,
+};
+
+
+/**
+ * smk_open_load_self - open() for /smack/load-self
+ * @inode: inode structure representing file
+ * @file: "load" file pointer
+ *
+ * For reading, use load_seq_* seq_file reading operations.
+ */
+static int smk_open_load_self(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &load_self_seq_ops);
+}
+
+/**
+ * smk_write_load_self - write() for /smack/load-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_load_self(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct task_smack *tsp = current_security();
+
+ return smk_write_load_list(file, buf, count, ppos, &tsp->smk_rules,
+ &tsp->smk_rules_lock);
+}
+
+static const struct file_operations smk_load_self_ops = {
+ .open = smk_open_load_self,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .write = smk_write_load_self,
+ .release = seq_release,
+};
/**
* smk_fill_super - fill the /smackfs superblock
* @sb: the empty superblock
@@ -1304,23 +1441,26 @@ static int smk_fill_super(struct super_block *sb, void *data, int silent)
struct inode *root_inode;
static struct tree_descr smack_files[] = {
- [SMK_LOAD] =
- {"load", &smk_load_ops, S_IRUGO|S_IWUSR},
- [SMK_CIPSO] =
- {"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
- [SMK_DOI] =
- {"doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
- [SMK_DIRECT] =
- {"direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
- [SMK_AMBIENT] =
- {"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
- [SMK_NETLBLADDR] =
- {"netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR},
- [SMK_ONLYCAP] =
- {"onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
- [SMK_LOGGING] =
- {"logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
- /* last one */ {""}
+ [SMK_LOAD] = {
+ "load", &smk_load_ops, S_IRUGO|S_IWUSR},
+ [SMK_CIPSO] = {
+ "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
+ [SMK_DOI] = {
+ "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
+ [SMK_DIRECT] = {
+ "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
+ [SMK_AMBIENT] = {
+ "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
+ [SMK_NETLBLADDR] = {
+ "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR},
+ [SMK_ONLYCAP] = {
+ "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
+ [SMK_LOGGING] = {
+ "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
+ [SMK_LOAD_SELF] = {
+ "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
+ /* last one */
+ {""}
};
rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-19 01:12:53 +0000