#include <linux/personality.h>
#include <linux/backing-dev.h>
#include <linux/string.h>
-#include <linux/msg.h>
+#include <linux/prctl.h>
#include <net/flow.h>
-#include <net/sock.h>
#define MAX_LSM_EVM_XATTR 2
/* Maximum number of letters for an LSM name string */
#define SECURITY_NAME_MAX 10
+#define SECURITY_CHOSEN_NAMES_MAX (SECURITY_NAME_MAX * LSM_MAX_MAJOR)
#define MODULE_STACK "(stacking)"
struct security_hook_heads security_hook_heads __lsm_ro_after_init;
static ATOMIC_NOTIFIER_HEAD(lsm_notifier_chain);
char *lsm_names;
-static struct lsm_blob_sizes blob_sizes;
+
+/*
+ * If stacking is enabled the task blob will always
+ * include an indicator of what security module data
+ * should be displayed. This is set with PR_SET_DISPLAY_LSM.
+ */
+static struct lsm_blob_sizes blob_sizes = {
+#ifdef CONFIG_SECURITY_STACKING
+ .lbs_task = SECURITY_NAME_MAX + 6,
+#endif
+};
/* Boot-time LSM user choice */
-static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] =
+static __initdata char chosen_lsms[SECURITY_CHOSEN_NAMES_MAX + 1] =
#ifdef CONFIG_SECURITY_STACKING
MODULE_STACK;
#else
CONFIG_DEFAULT_SECURITY;
#endif
+static __initdata char chosen_display_lsm[SECURITY_NAME_MAX + 1]
+#ifdef CONFIG_SECURITY_STACKING
+ = CONFIG_SECURITY_DEFAULT_DISPLAY_NAME
+#endif
+;
+static char default_display_lsm[SECURITY_NAME_MAX + 1];
static void __init do_security_initcalls(void)
{
#ifdef CONFIG_SECURITY_LSM_DEBUG
pr_info("LSM: cred blob size = %d\n", blob_sizes.lbs_cred);
pr_info("LSM: file blob size = %d\n", blob_sizes.lbs_file);
- pr_info("LSM: inode blob size = %d\n", blob_sizes.lbs_inode);
- pr_info("LSM: ipc blob size = %d\n", blob_sizes.lbs_ipc);
-#ifdef CONFIG_KEYS
- pr_info("LSM: key blob size = %d\n", blob_sizes.lbs_key);
-#endif /* CONFIG_KEYS */
- pr_info("LSM: msg_msg blob size = %d\n", blob_sizes.lbs_msg_msg);
- pr_info("LSM: sock blob size = %d\n", blob_sizes.lbs_sock);
- pr_info("LSM: superblock blob size = %d\n", blob_sizes.lbs_superblock);
pr_info("LSM: task blob size = %d\n", blob_sizes.lbs_task);
-#endif /* CONFIG_SECURITY_LSM_DEBUG */
+#endif
return 0;
}
/* Save user chosen LSM */
static int __init choose_lsm(char *str)
{
- strncpy(chosen_lsm, str, SECURITY_NAME_MAX);
+ strncpy(chosen_lsms, str, SECURITY_CHOSEN_NAMES_MAX);
+ pr_info("LSM: command line set '%s' security module(s).\n",
+ chosen_lsms);
return 1;
}
__setup("security=", choose_lsm);
+static int __init choose_display_lsm(char *str)
+{
+ strncpy(chosen_display_lsm, str, SECURITY_NAME_MAX);
+ pr_info("LSM: command line set default display lsm %s'\n",
+ chosen_display_lsm);
+ return 1;
+}
+__setup("security.display=", choose_display_lsm);
+
static bool match_last_lsm(const char *list, const char *lsm)
{
const char *last;
*
* Otherwise, return false.
*/
+#ifdef CONFIG_SECURITY_STACKING
+static bool __init cmp_lsms(const char *lsm)
+{
+ const char *str = chosen_lsms;
+ const char *split;
+ int len = strlen(lsm);
+
+ if (len > SECURITY_NAME_MAX) {
+ pr_info("LSM: security module name '%s' exceeds limit\n", lsm);
+ return false;
+ }
+ for (split = strchr(str, ','); split; split = strchr(str, ',')) {
+ if ((len == split - str) && !strncmp(lsm, str, split - str))
+ return true;
+ str = split + 1;
+ }
+ if ((len == strlen(str)) && !strncmp(lsm, str, strlen(str)))
+ return true;
+ return false;
+}
+#endif
+
bool __init security_module_enable(const char *lsm, const bool stacked)
{
#ifdef CONFIG_SECURITY_STACKING
/*
* Module defined on the command line security=XXXX
*/
- if (strcmp(chosen_lsm, MODULE_STACK)) {
- if (!strcmp(lsm, chosen_lsm)) {
- pr_info("Command line sets the %s security module.\n",
- lsm);
+ if (strcmp(chosen_lsms, MODULE_STACK)) {
+ if (cmp_lsms(lsm)) {
+ /* set to first LSM registered and then override */
+ if (!*default_display_lsm)
+ strcpy(default_display_lsm, lsm);
+ else if (*chosen_display_lsm && !strcmp(chosen_display_lsm, lsm)) {
+ strcpy(default_display_lsm, lsm);
+ pr_info("LSM: default display lsm '%s'\n", default_display_lsm);
+ }
return true;
}
return false;
/*
* Module configured as stacked.
*/
+ if (stacked && !*default_display_lsm)
+ strcpy(default_display_lsm, lsm);
+ else if (stacked && *chosen_display_lsm && !strcmp(chosen_display_lsm, lsm)) {
+ strcpy(default_display_lsm, lsm);
+ pr_info("LSM: default display lsm '%s'\n", default_display_lsm);
+ }
+
return stacked;
#else
- if (strcmp(lsm, chosen_lsm) == 0)
+ if (strcmp(lsm, chosen_lsms) == 0) {
+ strcpy(default_display_lsm, lsm);
return true;
+ }
return false;
#endif
}
+/*
+ * Keep the order of major modules for mapping secids.
+ */
+static int lsm_next_major;
+
/**
* security_add_hooks - Add a modules hooks to the hook lists.
* @hooks: the hooks to add
char *lsm)
{
int i;
+ int lsm_index = lsm_next_major++;
+#ifdef CONFIG_SECURITY_LSM_DEBUG
+ pr_info("LSM: Security module %s gets index %d\n", lsm, lsm_index);
+#endif
for (i = 0; i < count; i++) {
hooks[i].lsm = lsm;
+ hooks[i].lsm_index = lsm_index;
list_add_tail_rcu(&hooks[i].list, hooks[i].head);
}
if (lsm_append(lsm, &lsm_names) < 0)
{
lsm_set_size(&needed->lbs_cred, &blob_sizes.lbs_cred);
lsm_set_size(&needed->lbs_file, &blob_sizes.lbs_file);
- lsm_set_size(&needed->lbs_ipc, &blob_sizes.lbs_ipc);
- lsm_set_size(&needed->lbs_key, &blob_sizes.lbs_key);
- lsm_set_size(&needed->lbs_msg_msg, &blob_sizes.lbs_msg_msg);
- lsm_set_size(&needed->lbs_sock, &blob_sizes.lbs_sock);
- lsm_set_size(&needed->lbs_superblock, &blob_sizes.lbs_superblock);
lsm_set_size(&needed->lbs_task, &blob_sizes.lbs_task);
- /*
- * The inode blob gets an rcu_head in addition to
- * what the modules might need.
- */
- if (needed->lbs_inode && blob_sizes.lbs_inode == 0)
- blob_sizes.lbs_inode = sizeof(struct rcu_head);
- lsm_set_size(&needed->lbs_inode, &blob_sizes.lbs_inode);
}
/**
return 0;
}
-/**
- * lsm_task_alloc - allocate a composite task blob
- * @task: the task that needs a blob
- *
- * Allocate the task blob for all the modules
- *
- * Returns 0, or -ENOMEM if memory can't be allocated.
- */
-int lsm_task_alloc(struct task_struct *task)
+#ifdef CONFIG_SECURITY_STACKING
+static inline char *lsm_of_task(struct task_struct *task)
{
#ifdef CONFIG_SECURITY_LSM_DEBUG
- if (task->security)
- pr_info("%s: Inbound task blob is not NULL.\n", __func__);
-#endif
- if (blob_sizes.lbs_task == 0)
- return 0;
-
- task->security = kzalloc(blob_sizes.lbs_task, GFP_KERNEL);
if (task->security == NULL)
- return -ENOMEM;
- return 0;
-}
-
-/**
- * lsm_inode_alloc - allocate a composite inode blob
- * @inode: the inode that needs a blob
- *
- * Allocate the inode blob for all the modules
- *
- * Returns 0, or -ENOMEM if memory can't be allocated.
- */
-int lsm_inode_alloc(struct inode *inode)
-{
-#ifdef CONFIG_SECURITY_LSM_DEBUG
- if (inode->i_security)
- pr_info("%s: Inbound inode blob is not NULL.\n", __func__);
+ pr_info("%s: task has no lsm name.\n", __func__);
#endif
- if (blob_sizes.lbs_inode == 0)
- return 0;
-
- inode->i_security = kzalloc(blob_sizes.lbs_inode, GFP_KERNEL);
- if (inode->i_security == NULL)
- return -ENOMEM;
- return 0;
+ return task->security;
}
-
-/**
- * lsm_early_inode - during initialization allocate a composite inode blob
- * @inode: the inode that needs a blob
- *
- * Allocate the inode blob for all the modules if it's not already there
- */
-void lsm_early_inode(struct inode *inode)
-{
- int rc;
-
- if (inode == NULL)
- panic("%s: NULL inode.\n", __func__);
- if (inode->i_security != NULL)
- return;
- rc = lsm_inode_alloc(inode);
- if (rc)
- panic("%s: Early inode alloc failed.\n", __func__);
-}
-
-/**
- * lsm_ipc_alloc - allocate a composite ipc blob
- * @kip: the ipc that needs a blob
- *
- * Allocate the ipc blob for all the modules
- *
- * Returns 0, or -ENOMEM if memory can't be allocated.
- */
-int lsm_ipc_alloc(struct kern_ipc_perm *kip)
-{
-#ifdef CONFIG_SECURITY_LSM_DEBUG
- if (kip->security)
- pr_info("%s: Inbound ipc blob is not NULL.\n", __func__);
#endif
- if (blob_sizes.lbs_ipc == 0)
- return 0;
- kip->security = kzalloc(blob_sizes.lbs_ipc, GFP_KERNEL);
- if (kip->security == NULL)
- return -ENOMEM;
- return 0;
-}
+#ifdef CONFIG_SECURITY_STACKING
+struct lsm_value {
+ char *lsm;
+ char *data;
+};
-#ifdef CONFIG_KEYS
/**
- * lsm_key_alloc - allocate a composite key blob
- * @key: the key that needs a blob
- *
- * Allocate the key blob for all the modules
+ * lsm_parse_context - break a compound "context" into module data
+ * @cxt: the initial data, which will be modified
+ * @vlist: an array to receive the results
*
- * Returns 0, or -ENOMEM if memory can't be allocated.
+ * Returns the number of entries, or -EINVAL if the cxt is unworkable.
*/
-int lsm_key_alloc(struct key *key)
+static int lsm_parse_context(char *cxt, struct lsm_value *vlist)
{
-#ifdef CONFIG_SECURITY_LSM_DEBUG
- if (key->security)
- pr_info("%s: Inbound key blob is not NULL.\n", __func__);
-#endif
- if (blob_sizes.lbs_key == 0)
- return 0;
+ char *lsm;
+ char *data;
+ char *cp;
+ int i;
- key->security = kzalloc(blob_sizes.lbs_key, GFP_KERNEL);
- if (key->security == NULL)
- return -ENOMEM;
- return 0;
+ lsm = cxt;
+ for (i = 0; i < LSM_MAX_MAJOR; i++) {
+ data = strstr(lsm, "='");
+ if (!data)
+ break;
+ *data = '\0';
+ data += 2;
+ cp = strchr(data, '\'');
+ if (!cp)
+ return -EINVAL;
+ *cp++ = '\0';
+ vlist[i].lsm = lsm;
+ vlist[i].data = data;
+ if (*cp == '\0') {
+ i++;
+ break;
+ }
+ if (*cp == ',')
+ cp++;
+ else
+ return -EINVAL;
+ lsm = cp;
+ }
+ return i;
}
-#endif /* CONFIG_KEYS */
+#endif /* CONFIG_SECURITY_STACKING */
/**
- * lsm_msg_msg_alloc - allocate a composite msg_msg blob
- * @mp: the msg_msg that needs a blob
+ * lsm_task_alloc - allocate a composite task blob
+ * @task: the task that needs a blob
*
- * Allocate the ipc blob for all the modules
+ * Allocate the task blob for all the modules
*
* Returns 0, or -ENOMEM if memory can't be allocated.
*/
-int lsm_msg_msg_alloc(struct msg_msg *mp)
+int lsm_task_alloc(struct task_struct *task)
{
#ifdef CONFIG_SECURITY_LSM_DEBUG
- if (mp->security)
- pr_info("%s: Inbound msg_msg blob is not NULL.\n", __func__);
+ if (task->security)
+ pr_info("%s: Inbound task blob is not NULL.\n", __func__);
#endif
- if (blob_sizes.lbs_msg_msg == 0)
+ if (blob_sizes.lbs_task == 0)
return 0;
- mp->security = kzalloc(blob_sizes.lbs_msg_msg, GFP_KERNEL);
- if (mp->security == NULL)
+ task->security = kzalloc(blob_sizes.lbs_task, GFP_KERNEL);
+ if (task->security == NULL)
return -ENOMEM;
- return 0;
-}
-
-/**
- * lsm_sock_alloc - allocate a composite sock blob
- * @sock: the sock that needs a blob
- * @priority: allocation mode
- *
- * Allocate the sock blob for all the modules
- *
- * Returns 0, or -ENOMEM if memory can't be allocated.
- */
-int lsm_sock_alloc(struct sock *sock, gfp_t priority)
-{
-#ifdef CONFIG_SECURITY_LSM_DEBUG
- if (sock->sk_security)
- pr_info("%s: Inbound sock blob is not NULL.\n", __func__);
-#endif
- if (blob_sizes.lbs_sock == 0)
- return 0;
- sock->sk_security = kzalloc(blob_sizes.lbs_sock, priority);
- if (sock->sk_security == NULL)
- return -ENOMEM;
- return 0;
-}
-
-/**
- * lsm_superblock_alloc - allocate a composite superblock blob
- * @sb: the superblock that needs a blob
- *
- * Allocate the superblock blob for all the modules
- *
- * Returns 0, or -ENOMEM if memory can't be allocated.
- */
-int lsm_superblock_alloc(struct super_block *sb)
-{
-#ifdef CONFIG_SECURITY_LSM_DEBUG
- if (sb->s_security)
- pr_info("%s: Inbound superblock blob is not NULL.\n", __func__);
+ /* inherit current display lsm */
+#ifdef CONFIG_SECURITY_STACKING
+ if (current->security)
+ strcpy(task->security, lsm_of_task(current));
+ else
+ strcpy(task->security, default_display_lsm);
#endif
- if (blob_sizes.lbs_superblock == 0)
- return 0;
-
- sb->s_security = kzalloc(blob_sizes.lbs_superblock, GFP_KERNEL);
- if (sb->s_security == NULL)
- return -ENOMEM;
return 0;
}
int security_sb_alloc(struct super_block *sb)
{
- int rc = lsm_superblock_alloc(sb);
-
- if (rc)
- return rc;
return call_int_hook(sb_alloc_security, 0, sb);
}
void security_sb_free(struct super_block *sb)
{
call_void_hook(sb_free_security, sb);
- kfree(sb->s_security);
- sb->s_security = NULL;
}
int security_sb_copy_data(char *orig, char *copy)
int security_inode_alloc(struct inode *inode)
{
- int rc = lsm_inode_alloc(inode);
-
- if (rc)
- return rc;
+ inode->i_security = NULL;
return call_int_hook(inode_alloc_security, 0, inode);
}
-static void inode_free_by_rcu(struct rcu_head *head)
-{
- /*
- * The rcu head is at the start of the inode blob
- */
- kfree(head);
-}
-
void security_inode_free(struct inode *inode)
{
integrity_inode_free(inode);
call_void_hook(inode_free_security, inode);
- /*
- * The inode may still be referenced in a path walk and
- * a call to security_inode_permission() can be made
- * after inode_free_security() is called. Ideally, the VFS
- * wouldn't do this, but fixing that is a much harder
- * job. For now, simply free the i_security via RCU, and
- * leave the current inode->i_security pointer intact.
- * The inode will be freed after the RCU grace period too.
- */
- if (inode->i_security != NULL) {
- call_rcu((struct rcu_head *)inode->i_security,
- inode_free_by_rcu);
- inode->i_security = NULL;
- }
}
int security_dentry_init_security(struct dentry *dentry, int mode,
int security_task_alloc(struct task_struct *task, unsigned long clone_flags)
{
+ int rc = lsm_task_alloc(task);
+
+ if (rc)
+ return rc;
return call_int_hook(task_alloc, 0, task, clone_flags);
}
return call_int_hook(task_kill, 0, p, info, sig, secid);
}
+#ifdef CONFIG_SECURITY_STACKING
+static char *nolsm = "-default";
+#define NOLSMLEN 9
+
+static bool is_registered_lsm(const char *str, size_t size)
+{
+ struct security_hook_list *hp;
+
+ list_for_each_entry(hp, &security_hook_heads.getprocattr, list) {
+ if (size == strlen(hp->lsm) && !strncmp(str, hp->lsm, size))
+ return true;
+ }
+
+ return false;
+}
+
+static bool set_lsm_of_current(const char *str, size_t size)
+{
+ char *lsm = lsm_of_task(current);
+
+ if (is_registered_lsm(str, size)) {
+ strncpy(lsm, str, size);
+ lsm[size] = '\0';
+ } else if (size == NOLSMLEN && !strncmp(str, nolsm, size)) {
+ lsm[0] = '\0';
+ } else {
+ return false;
+ }
+ return true;
+}
+
+static int lsm_task_prctl(int option, unsigned long arg2, unsigned long arg3,
+ unsigned long arg4, unsigned long arg5)
+{
+ char *lsm = lsm_of_task(current);
+ char buffer[SECURITY_NAME_MAX + 1];
+ __user char *optval = (__user char *)arg2;
+ __user int *optlen = (__user int *)arg3;
+ int dlen;
+ int len;
+
+ switch (option) {
+ case PR_GET_DISPLAY_LSM:
+ len = arg4;
+ if (lsm[0] == '\0') {
+ lsm = nolsm;
+ dlen = NOLSMLEN;
+ } else
+ dlen = strlen(lsm) + 1;
+ if (dlen > len)
+ return -ERANGE;
+ if (copy_to_user(optval, lsm, dlen))
+ return -EFAULT;
+ if (put_user(dlen, optlen))
+ return -EFAULT;
+ break;
+ case PR_SET_DISPLAY_LSM:
+ len = arg3;
+ if (len > SECURITY_NAME_MAX)
+ return -EINVAL;
+ if (copy_from_user(buffer, optval, len))
+ return -EFAULT;
+ buffer[len] = '\0';
+ /* verify the requested LSM is registered */
+ if (!set_lsm_of_current(buffer, len))
+ return -ENOENT;
+ break;
+ default:
+ return -ENOSYS;
+ }
+ return 0;
+}
+#endif
+
int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
unsigned long arg4, unsigned long arg5)
{
int rc = -ENOSYS;
struct security_hook_list *hp;
+#ifdef CONFIG_SECURITY_STACKING
+ rc = lsm_task_prctl(option, arg2, arg3, arg4, arg5);
+ if (rc != -ENOSYS)
+ return rc;
+#endif
+
list_for_each_entry(hp, &security_hook_heads.task_prctl, list) {
thisrc = hp->hook.task_prctl(option, arg2, arg3, arg4, arg5);
if (thisrc != -ENOSYS) {
int security_msg_msg_alloc(struct msg_msg *msg)
{
- int rc = lsm_msg_msg_alloc(msg);
-
- if (rc)
- return rc;
return call_int_hook(msg_msg_alloc_security, 0, msg);
}
void security_msg_msg_free(struct msg_msg *msg)
{
call_void_hook(msg_msg_free_security, msg);
- kfree(msg->security);
- msg->security = NULL;
}
int security_msg_queue_alloc(struct msg_queue *msq)
{
- int rc = lsm_ipc_alloc(&msq->q_perm);
-
- if (rc)
- return rc;
return call_int_hook(msg_queue_alloc_security, 0, msq);
}
void security_msg_queue_free(struct msg_queue *msq)
{
- struct kern_ipc_perm *kip = &msq->q_perm;
-
call_void_hook(msg_queue_free_security, msq);
- kfree(kip->security);
- kip->security = NULL;
}
int security_msg_queue_associate(struct msg_queue *msq, int msqflg)
int security_shm_alloc(struct shmid_kernel *shp)
{
- int rc = lsm_ipc_alloc(&shp->shm_perm);
-
- if (rc)
- return rc;
return call_int_hook(shm_alloc_security, 0, shp);
}
void security_shm_free(struct shmid_kernel *shp)
{
- struct kern_ipc_perm *kip = &shp->shm_perm;
-
call_void_hook(shm_free_security, shp);
- kfree(kip->security);
- kip->security = NULL;
}
int security_shm_associate(struct shmid_kernel *shp, int shmflg)
int security_sem_alloc(struct sem_array *sma)
{
- int rc = lsm_ipc_alloc(&sma->sem_perm);
-
- if (rc)
- return rc;
return call_int_hook(sem_alloc_security, 0, sma);
}
void security_sem_free(struct sem_array *sma)
{
- struct kern_ipc_perm *kip = &sma->sem_perm;
-
call_void_hook(sem_free_security, sma);
- kfree(kip->security);
- kip->security = NULL;
}
int security_sem_associate(struct sem_array *sma, int semflg)
int security_getprocattr(struct task_struct *p, const char *lsm, char *name,
char **value)
{
+#ifdef CONFIG_SECURITY_STACKING
+ char *speclsm = lsm_of_task(p);
+#endif
struct security_hook_list *hp;
char *vp;
char *cp = NULL;
if (rc > 0)
return strlen(*value);
return rc;
+ } else if (strcmp(name, "display_lsm") == 0) {
+ *value = kstrdup(current->security, GFP_KERNEL);
+ if (*value == NULL)
+ return -ENOMEM;
+ return strlen(*value);
}
list_for_each_entry(hp, &security_hook_heads.getprocattr, list) {
if (lsm != NULL && strcmp(lsm, hp->lsm))
continue;
+#ifdef CONFIG_SECURITY_STACKING
+ if (!lsm && speclsm && speclsm[0] && strcmp(speclsm, hp->lsm))
+ continue;
+#endif
rc = hp->hook.getprocattr(p, name, value);
- if (rc != -ENOENT)
+ if (rc != -ENOSYS)
return rc;
}
return -EINVAL;
int security_setprocattr(const char *lsm, const char *name, void *value,
size_t size)
{
+#ifdef CONFIG_SECURITY_STACKING
+ char *speclsm = lsm_of_task(current);
+ struct lsm_value *lsm_value = NULL;
+ int count;
+#else
+ char *tvalue;
+#endif
struct security_hook_list *hp;
int rc;
- char *local;
+ char *temp;
char *cp;
- int slen;
- int failed = 0;
+
+ if (!size)
+ return -EINVAL;
/*
* If lsm is NULL look at all the modules to find one
* "context" is handled directly here.
*/
if (strcmp(name, "context") == 0) {
- /*
- * First verify that the input is acceptable.
- * lsm1='v1'lsm2='v2'lsm3='v3'
- *
- * A note on the use of strncmp() below.
- * The check is for the substring at the beginning of cp.
- * The kzalloc of size + 1 ensures a terminated string.
- */
rc = -EINVAL;
- local = kzalloc(size + 1, GFP_KERNEL);
- memcpy(local, value, size);
- cp = local;
- list_for_each_entry(hp, &security_hook_heads.setprocattr,
- list) {
- if (lsm != NULL && strcmp(lsm, hp->lsm))
- continue;
- if (cp[0] == ',') {
- if (cp == local)
- goto free_out;
- cp++;
- }
- slen = strlen(hp->lsm);
- if (strncmp(cp, hp->lsm, slen))
- goto free_out;
- cp += slen;
- if (cp[0] != '=' || cp[1] != '\'' || cp[2] == '\'')
- goto free_out;
- for (cp += 2; cp[0] != '\''; cp++)
- if (cp[0] == '\0')
- goto free_out;
- cp++;
+ temp = kmemdup(value, size + 1, GFP_KERNEL);
+ if (!temp)
+ return -ENOMEM;
+
+ temp[size] = '\0';
+ cp = strrchr(temp, '\'');
+ if (!cp)
+ goto free_out;
+
+ cp[1] = '\0';
+#ifdef CONFIG_SECURITY_STACKING
+ lsm_value = kzalloc(sizeof(*lsm_value) * LSM_MAX_MAJOR,
+ GFP_KERNEL);
+ if (!lsm_value) {
+ rc = -ENOMEM;
+ goto free_out;
}
- cp = local;
+ count = lsm_parse_context(temp, lsm_value);
+ if (count <= 0)
+ goto free_out;
+
+ for (count--; count >= 0; count--) {
+ list_for_each_entry(hp,
+ &security_hook_heads.setprocattr, list) {
+
+ if (lsm && strcmp(lsm, hp->lsm))
+ continue;
+ if (!strcmp(hp->lsm, lsm_value[count].lsm)) {
+ rc = hp->hook.setprocattr("context",
+ lsm_value[count].data,
+ strlen(lsm_value[count].data));
+ break;
+ }
+ }
+ if (rc < 0 || (lsm && rc >0))
+ break;
+ }
+#else /* CONFIG_SECURITY_STACKING */
+ cp = strstr(temp, "='");
+ if (!cp)
+ goto free_out;
+ *cp = '\0';
+ tvalue = strchr(cp + 2, '\'');
+ if (!tvalue)
+ goto free_out;
list_for_each_entry(hp, &security_hook_heads.setprocattr,
- list) {
- if (lsm != NULL && strcmp(lsm, hp->lsm))
- continue;
- if (cp[0] == ',')
- cp++;
- cp += strlen(hp->lsm) + 2;
- for (slen = 0; cp[slen] != '\''; slen++)
- ;
- cp[slen] = '\0';
-
- rc = hp->hook.setprocattr("context", cp, slen);
- if (rc < 0)
- failed = rc;
- cp += slen + 1;
+ list) {
+ if (lsm == NULL || !strcmp(lsm, hp->lsm)) {
+ rc = hp->hook.setprocattr(name, tvalue, size);
+ break;
+ }
}
- if (failed != 0)
- rc = failed;
- else
- rc = size;
+#endif /* CONFIG_SECURITY_STACKING */
free_out:
- kfree(local);
+ kfree(temp);
+#ifdef CONFIG_SECURITY_STACKING
+ kfree(lsm_value);
+#endif
+ if (rc >= 0)
+ return size;
return rc;
+ } else if (strcmp(name, "display_lsm") == 0) {
+#ifdef CONFIG_SECURITY_STACKING
+ if (set_lsm_of_current(value, size))
+ return size;
+#endif
+ return -EINVAL;
}
list_for_each_entry(hp, &security_hook_heads.setprocattr, list) {
- if (lsm != NULL && strcmp(lsm, hp->lsm))
+ if (lsm && strcmp(lsm, hp->lsm))
continue;
+#ifdef CONFIG_SECURITY_STACKING
+ if (!lsm && speclsm && speclsm[0] && strcmp(speclsm, hp->lsm))
+ continue;
+#endif
rc = hp->hook.setprocattr(name, value, size);
- if (rc != -ENOENT)
+ if (rc)
return rc;
}
return -EINVAL;
void security_release_secctx(char *secdata, u32 seclen)
{
- call_void_hook(release_secctx, secdata, seclen);
+#ifdef CONFIG_SECURITY_STACKING
+ char *speclsm = lsm_of_task(current);
+#endif
+ struct security_hook_list *hp;
+
+ list_for_each_entry(hp, &security_hook_heads.release_secctx, list) {
+#ifdef CONFIG_SECURITY_STACKING
+ if (speclsm[0] && strcmp(hp->lsm, speclsm))
+ continue;
+#endif
+ hp->hook.release_secctx(secdata, seclen);
+ break;
+ }
}
EXPORT_SYMBOL(security_release_secctx);
int security_socket_getpeersec_stream(struct socket *sock, char __user *optval,
int __user *optlen, unsigned len)
{
+#ifdef CONFIG_SECURITY_STACKING
+ struct security_hook_list *hp;
+ char *lsm = lsm_of_task(current);
+
+ list_for_each_entry(hp, &security_hook_heads.socket_getpeersec_stream,
+ list) {
+ if (!lsm || !lsm[0] || !strcmp(lsm, hp->lsm))
+ return hp->hook.socket_getpeersec_stream(sock, optval,
+ optlen, len);
+ }
+ return -ENOPROTOOPT;
+#else
return call_int_hook(socket_getpeersec_stream, -ENOPROTOOPT, sock,
optval, optlen, len);
+#endif
}
int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
int security_sk_alloc(struct sock *sk, int family, gfp_t priority)
{
- int rc = lsm_sock_alloc(sk, priority);
-
- if (rc)
- return rc;
return call_int_hook(sk_alloc_security, 0, sk, family, priority);
}
void security_sk_free(struct sock *sk)
{
call_void_hook(sk_free_security, sk);
- kfree(sk->sk_security);
- sk->sk_security = NULL;
}
void security_sk_clone(const struct sock *sk, struct sock *newsk)
int security_key_alloc(struct key *key, const struct cred *cred,
unsigned long flags)
{
- int rc = lsm_key_alloc(key);
-
- if (rc)
- return rc;
return call_int_hook(key_alloc, 0, key, cred, flags);
}
void security_key_free(struct key *key)
{
call_void_hook(key_free, key);
- kfree(key->security);
- key->security = NULL;
}
int security_key_permission(key_ref_t key_ref,
projects / mirror_ubuntu-artful-kernel.git / blobdiff