TOMOYO: Cleanup part 3.
Use common structure for ACL with "struct list_head" + "atomic_t".
Use array/struct where possible.
Remove is_group from "struct tomoyo_name_union"/"struct tomoyo_number_union".
Pass "struct file"->private_data rather than "struct file".
Update some of comments.
Bring tomoyo_same_acl_head() from common.h to domain.c .
Bring tomoyo_invalid()/tomoyo_valid() from common.h to util.c .
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
index 1c34021..2e6792d 100644
--- a/security/tomoyo/common.c
+++ b/security/tomoyo/common.c
@@ -192,7 +192,7 @@
const struct tomoyo_name_union *ptr)
{
tomoyo_set_space(head);
- if (ptr->is_group) {
+ if (ptr->group) {
tomoyo_set_string(head, "@");
tomoyo_set_string(head, ptr->group->group_name->name);
} else {
@@ -210,15 +210,15 @@
const struct tomoyo_number_union *ptr)
{
tomoyo_set_space(head);
- if (ptr->is_group) {
+ if (ptr->group) {
tomoyo_set_string(head, "@");
tomoyo_set_string(head, ptr->group->group_name->name);
} else {
int i;
unsigned long min = ptr->values[0];
const unsigned long max = ptr->values[1];
- u8 min_type = ptr->min_type;
- const u8 max_type = ptr->max_type;
+ u8 min_type = ptr->value_type[0];
+ const u8 max_type = ptr->value_type[1];
char buffer[128];
buffer[0] = '\0';
for (i = 0; i < 2; i++) {
@@ -769,7 +769,7 @@
domain = tomoyo_find_domain(data + 7);
} else
return false;
- head->write_var1 = domain;
+ head->w.domain = domain;
/* Accessing read_buf is safe because head->io_sem is held. */
if (!head->read_buf)
return true; /* Do nothing if open(O_WRONLY). */
@@ -847,7 +847,7 @@
static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
{
char *data = head->write_buf;
- struct tomoyo_domain_info *domain = head->write_var1;
+ struct tomoyo_domain_info *domain = head->w.domain;
bool is_delete = false;
bool is_select = false;
unsigned int profile;
@@ -869,7 +869,7 @@
domain = tomoyo_find_domain(data);
else
domain = tomoyo_assign_domain(data, 0);
- head->write_var1 = domain;
+ head->w.domain = domain;
return 0;
}
if (!domain)
@@ -1250,7 +1250,7 @@
{
list_for_each_cookie(head->r.group, &tomoyo_group_list[idx]) {
struct tomoyo_group *group =
- list_entry(head->r.group, typeof(*group), list);
+ list_entry(head->r.group, typeof(*group), head.list);
list_for_each_cookie(head->r.acl, &group->member_list) {
struct tomoyo_acl_head *ptr =
list_entry(head->r.acl, typeof(*ptr), list);
@@ -1874,7 +1874,7 @@
/**
* tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
*
- * @file: Pointer to "struct file".
+ * @head: Pointer to "struct tomoyo_io_buffer".
* @buffer: Poiner to buffer to write to.
* @buffer_len: Size of @buffer.
*
@@ -1882,11 +1882,10 @@
*
* Caller holds tomoyo_read_lock().
*/
-int tomoyo_read_control(struct file *file, char __user *buffer,
+int tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
const int buffer_len)
{
int len;
- struct tomoyo_io_buffer *head = file->private_data;
if (!head->read)
return -ENOSYS;
@@ -1906,7 +1905,7 @@
/**
* tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
*
- * @file: Pointer to "struct file".
+ * @head: Pointer to "struct tomoyo_io_buffer".
* @buffer: Pointer to buffer to read from.
* @buffer_len: Size of @buffer.
*
@@ -1914,10 +1913,9 @@
*
* Caller holds tomoyo_read_lock().
*/
-int tomoyo_write_control(struct file *file, const char __user *buffer,
- const int buffer_len)
+int tomoyo_write_control(struct tomoyo_io_buffer *head,
+ const char __user *buffer, const int buffer_len)
{
- struct tomoyo_io_buffer *head = file->private_data;
int error = buffer_len;
int avail_len = buffer_len;
char *cp0 = head->write_buf;
@@ -1935,7 +1933,7 @@
/* Read a line and dispatch it to the policy handler. */
while (avail_len > 0) {
char c;
- if (head->write_avail >= head->writebuf_size - 1) {
+ if (head->w.avail >= head->writebuf_size - 1) {
error = -ENOMEM;
break;
} else if (get_user(c, buffer)) {
@@ -1944,11 +1942,11 @@
}
buffer++;
avail_len--;
- cp0[head->write_avail++] = c;
+ cp0[head->w.avail++] = c;
if (c != '\n')
continue;
- cp0[head->write_avail - 1] = '\0';
- head->write_avail = 0;
+ cp0[head->w.avail - 1] = '\0';
+ head->w.avail = 0;
tomoyo_normalize_line(cp0);
head->write(head);
}
@@ -1959,15 +1957,14 @@
/**
* tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
*
- * @file: Pointer to "struct file".
+ * @head: Pointer to "struct tomoyo_io_buffer".
*
* Releases memory and returns 0.
*
* Caller looses tomoyo_read_lock().
*/
-int tomoyo_close_control(struct file *file)
+int tomoyo_close_control(struct tomoyo_io_buffer *head)
{
- struct tomoyo_io_buffer *head = file->private_data;
const bool is_write = !!head->write_buf;
/*
@@ -1984,8 +1981,6 @@
kfree(head->write_buf);
head->write_buf = NULL;
kfree(head);
- head = NULL;
- file->private_data = NULL;
if (is_write)
tomoyo_run_gc();
return 0;
diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h
index d064573..7aa55ee 100644
--- a/security/tomoyo/common.h
+++ b/security/tomoyo/common.h
@@ -219,6 +219,12 @@
bool is_deleted;
} __packed;
+/* Common header for shared entries. */
+struct tomoyo_shared_acl_head {
+ struct list_head list;
+ atomic_t users;
+} __packed;
+
/* Structure for request info. */
struct tomoyo_request_info {
struct tomoyo_domain_info *domain;
@@ -281,8 +287,7 @@
/* Structure for holding string data. */
struct tomoyo_name {
- struct list_head list;
- atomic_t users;
+ struct tomoyo_shared_acl_head head;
struct tomoyo_path_info entry;
};
@@ -291,8 +296,6 @@
/* Either @filename or @group is NULL. */
const struct tomoyo_path_info *filename;
struct tomoyo_group *group;
- /* True if @group != NULL, false if @filename != NULL. */
- u8 is_group;
};
/* Structure for holding a number. */
@@ -300,18 +303,14 @@
unsigned long values[2];
struct tomoyo_group *group; /* Maybe NULL. */
/* One of values in "enum tomoyo_value_type". */
- u8 min_type;
- u8 max_type;
- /* True if @group != NULL, false otherwise. */
- u8 is_group;
+ u8 value_type[2];
};
/* Structure for "path_group"/"number_group" directive. */
struct tomoyo_group {
- struct list_head list;
+ struct tomoyo_shared_acl_head head;
const struct tomoyo_path_info *group_name;
struct list_head member_list;
- atomic_t users;
};
/* Structure for "path_group" directive. */
@@ -429,16 +428,18 @@
bool print_execute_only;
const char *w[TOMOYO_MAX_IO_READ_QUEUE];
} r;
- /* The position currently writing to. */
- struct tomoyo_domain_info *write_var1;
+ struct {
+ /* The position currently writing to. */
+ struct tomoyo_domain_info *domain;
+ /* Bytes available for writing. */
+ int avail;
+ } w;
/* Buffer for reading. */
char *read_buf;
/* Size of read buffer. */
int readbuf_size;
/* Buffer for writing. */
char *write_buf;
- /* Bytes available for writing. */
- int write_avail;
/* Size of write buffer. */
int writebuf_size;
/* Type of this interface. */
@@ -500,12 +501,12 @@
__attribute__ ((format(printf, 2, 3)));
void tomoyo_check_profile(void);
int tomoyo_open_control(const u8 type, struct file *file);
-int tomoyo_close_control(struct file *file);
+int tomoyo_close_control(struct tomoyo_io_buffer *head);
int tomoyo_poll_control(struct file *file, poll_table *wait);
-int tomoyo_read_control(struct file *file, char __user *buffer,
+int tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
const int buffer_len);
-int tomoyo_write_control(struct file *file, const char __user *buffer,
- const int buffer_len);
+int tomoyo_write_control(struct tomoyo_io_buffer *head,
+ const char __user *buffer, const int buffer_len);
bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r);
void tomoyo_warn_oom(const char *function);
const struct tomoyo_path_info *
@@ -672,30 +673,6 @@
}
/**
- * tomoyo_valid - Check whether the character is a valid char.
- *
- * @c: The character to check.
- *
- * Returns true if @c is a valid character, false otherwise.
- */
-static inline bool tomoyo_valid(const unsigned char c)
-{
- return c > ' ' && c < 127;
-}
-
-/**
- * tomoyo_invalid - Check whether the character is an invalid char.
- *
- * @c: The character to check.
- *
- * Returns true if @c is an invalid character, false otherwise.
- */
-static inline bool tomoyo_invalid(const unsigned char c)
-{
- return c && (c <= ' ' || c >= 127);
-}
-
-/**
* tomoyo_put_name - Drop reference on "struct tomoyo_name".
*
* @name: Pointer to "struct tomoyo_path_info". Maybe NULL.
@@ -707,7 +684,7 @@
if (name) {
struct tomoyo_name *ptr =
container_of(name, typeof(*ptr), entry);
- atomic_dec(&ptr->users);
+ atomic_dec(&ptr->head.users);
}
}
@@ -721,7 +698,7 @@
static inline void tomoyo_put_group(struct tomoyo_group *group)
{
if (group)
- atomic_dec(&group->users);
+ atomic_dec(&group->head.users);
}
/**
@@ -747,12 +724,6 @@
return task_cred_xxx(task, security);
}
-static inline bool tomoyo_same_acl_head(const struct tomoyo_acl_info *p1,
- const struct tomoyo_acl_info *p2)
-{
- return p1->type == p2->type;
-}
-
/**
* tomoyo_same_name_union - Check for duplicated "struct tomoyo_name_union" entry.
*
@@ -764,8 +735,7 @@
static inline bool tomoyo_same_name_union
(const struct tomoyo_name_union *a, const struct tomoyo_name_union *b)
{
- return a->filename == b->filename && a->group == b->group &&
- a->is_group == b->is_group;
+ return a->filename == b->filename && a->group == b->group;
}
/**
@@ -780,8 +750,8 @@
(const struct tomoyo_number_union *a, const struct tomoyo_number_union *b)
{
return a->values[0] == b->values[0] && a->values[1] == b->values[1] &&
- a->group == b->group && a->min_type == b->min_type &&
- a->max_type == b->max_type && a->is_group == b->is_group;
+ a->group == b->group && a->value_type[0] == b->value_type[0] &&
+ a->value_type[1] == b->value_type[1];
}
/**
diff --git a/security/tomoyo/domain.c b/security/tomoyo/domain.c
index 355b536..4397708 100644
--- a/security/tomoyo/domain.c
+++ b/security/tomoyo/domain.c
@@ -59,6 +59,20 @@
}
/**
+ * tomoyo_same_acl_head - Check for duplicated "struct tomoyo_acl_info" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
+static inline bool tomoyo_same_acl_head(const struct tomoyo_acl_info *a,
+ const struct tomoyo_acl_info *b)
+{
+ return a->type == b->type;
+}
+
+/**
* tomoyo_update_domain - Update an entry for domain policy.
*
* @new_entry: Pointer to "struct tomoyo_acl_info".
@@ -88,7 +102,8 @@
if (mutex_lock_interruptible(&tomoyo_policy_lock))
return error;
list_for_each_entry_rcu(entry, &domain->acl_info_list, list) {
- if (!check_duplicate(entry, new_entry))
+ if (!tomoyo_same_acl_head(entry, new_entry) ||
+ !check_duplicate(entry, new_entry))
continue;
if (merge_duplicate)
entry->is_deleted = merge_duplicate(entry, new_entry,
diff --git a/security/tomoyo/file.c b/security/tomoyo/file.c
index 3323802..4259e0a 100644
--- a/security/tomoyo/file.c
+++ b/security/tomoyo/file.c
@@ -49,6 +49,9 @@
[TOMOYO_TYPE_CHGRP] = "chgrp",
};
+/*
+ * Mapping table from "enum tomoyo_path_acl_index" to "enum tomoyo_mac_index".
+ */
static const u8 tomoyo_p2mac[TOMOYO_MAX_PATH_OPERATION] = {
[TOMOYO_TYPE_EXECUTE] = TOMOYO_MAC_FILE_EXECUTE,
[TOMOYO_TYPE_READ] = TOMOYO_MAC_FILE_OPEN,
@@ -63,17 +66,27 @@
[TOMOYO_TYPE_UMOUNT] = TOMOYO_MAC_FILE_UMOUNT,
};
+/*
+ * Mapping table from "enum tomoyo_mkdev_acl_index" to "enum tomoyo_mac_index".
+ */
static const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION] = {
[TOMOYO_TYPE_MKBLOCK] = TOMOYO_MAC_FILE_MKBLOCK,
[TOMOYO_TYPE_MKCHAR] = TOMOYO_MAC_FILE_MKCHAR,
};
+/*
+ * Mapping table from "enum tomoyo_path2_acl_index" to "enum tomoyo_mac_index".
+ */
static const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION] = {
[TOMOYO_TYPE_LINK] = TOMOYO_MAC_FILE_LINK,
[TOMOYO_TYPE_RENAME] = TOMOYO_MAC_FILE_RENAME,
[TOMOYO_TYPE_PIVOT_ROOT] = TOMOYO_MAC_FILE_PIVOT_ROOT,
};
+/*
+ * Mapping table from "enum tomoyo_path_number_acl_index" to
+ * "enum tomoyo_mac_index".
+ */
static const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION] = {
[TOMOYO_TYPE_CREATE] = TOMOYO_MAC_FILE_CREATE,
[TOMOYO_TYPE_MKDIR] = TOMOYO_MAC_FILE_MKDIR,
@@ -85,41 +98,76 @@
[TOMOYO_TYPE_CHGRP] = TOMOYO_MAC_FILE_CHGRP,
};
+/**
+ * tomoyo_put_name_union - Drop reference on "struct tomoyo_name_union".
+ *
+ * @ptr: Pointer to "struct tomoyo_name_union".
+ *
+ * Returns nothing.
+ */
void tomoyo_put_name_union(struct tomoyo_name_union *ptr)
{
- if (!ptr)
- return;
- if (ptr->is_group)
- tomoyo_put_group(ptr->group);
- else
- tomoyo_put_name(ptr->filename);
+ tomoyo_put_group(ptr->group);
+ tomoyo_put_name(ptr->filename);
}
+/**
+ * tomoyo_compare_name_union - Check whether a name matches "struct tomoyo_name_union" or not.
+ *
+ * @name: Pointer to "struct tomoyo_path_info".
+ * @ptr: Pointer to "struct tomoyo_name_union".
+ *
+ * Returns "struct tomoyo_path_info" if @name matches @ptr, NULL otherwise.
+ */
const struct tomoyo_path_info *
tomoyo_compare_name_union(const struct tomoyo_path_info *name,
const struct tomoyo_name_union *ptr)
{
- if (ptr->is_group)
+ if (ptr->group)
return tomoyo_path_matches_group(name, ptr->group);
if (tomoyo_path_matches_pattern(name, ptr->filename))
return ptr->filename;
return NULL;
}
+/**
+ * tomoyo_put_number_union - Drop reference on "struct tomoyo_number_union".
+ *
+ * @ptr: Pointer to "struct tomoyo_number_union".
+ *
+ * Returns nothing.
+ */
void tomoyo_put_number_union(struct tomoyo_number_union *ptr)
{
- if (ptr && ptr->is_group)
- tomoyo_put_group(ptr->group);
+ tomoyo_put_group(ptr->group);
}
+/**
+ * tomoyo_compare_number_union - Check whether a value matches "struct tomoyo_number_union" or not.
+ *
+ * @value: Number to check.
+ * @ptr: Pointer to "struct tomoyo_number_union".
+ *
+ * Returns true if @value matches @ptr, false otherwise.
+ */
bool tomoyo_compare_number_union(const unsigned long value,
const struct tomoyo_number_union *ptr)
{
- if (ptr->is_group)
+ if (ptr->group)
return tomoyo_number_matches_group(value, value, ptr->group);
return value >= ptr->values[0] && value <= ptr->values[1];
}
+/**
+ * tomoyo_add_slash - Add trailing '/' if needed.
+ *
+ * @buf: Pointer to "struct tomoyo_path_info".
+ *
+ * Returns nothing.
+ *
+ * @buf must be generated by tomoyo_encode() because this function does not
+ * allocate memory for adding '/'.
+ */
static void tomoyo_add_slash(struct tomoyo_path_info *buf)
{
if (buf->is_dir)
@@ -247,6 +295,18 @@
filename->name, buffer);
}
+/**
+ * tomoyo_check_path_acl - Check permission for path operation.
+ *
+ * @r: Pointer to "struct tomoyo_request_info".
+ * @ptr: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if granted, false otherwise.
+ *
+ * To be able to use wildcard for domain transition, this function sets
+ * matching entry on success. Since the caller holds tomoyo_read_lock(),
+ * it is safe to set matching entry.
+ */
static bool tomoyo_check_path_acl(struct tomoyo_request_info *r,
const struct tomoyo_acl_info *ptr)
{
@@ -261,6 +321,14 @@
return false;
}
+/**
+ * tomoyo_check_path_number_acl - Check permission for path number operation.
+ *
+ * @r: Pointer to "struct tomoyo_request_info".
+ * @ptr: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if granted, false otherwise.
+ */
static bool tomoyo_check_path_number_acl(struct tomoyo_request_info *r,
const struct tomoyo_acl_info *ptr)
{
@@ -273,6 +341,14 @@
&acl->name);
}
+/**
+ * tomoyo_check_path2_acl - Check permission for path path operation.
+ *
+ * @r: Pointer to "struct tomoyo_request_info".
+ * @ptr: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if granted, false otherwise.
+ */
static bool tomoyo_check_path2_acl(struct tomoyo_request_info *r,
const struct tomoyo_acl_info *ptr)
{
@@ -284,8 +360,16 @@
&acl->name2);
}
+/**
+ * tomoyo_check_mkdev_acl - Check permission for path number number number operation.
+ *
+ * @r: Pointer to "struct tomoyo_request_info".
+ * @ptr: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if granted, false otherwise.
+ */
static bool tomoyo_check_mkdev_acl(struct tomoyo_request_info *r,
- const struct tomoyo_acl_info *ptr)
+ const struct tomoyo_acl_info *ptr)
{
const struct tomoyo_mkdev_acl *acl =
container_of(ptr, typeof(*acl), head);
@@ -300,13 +384,20 @@
&acl->name);
}
+/**
+ * tomoyo_same_path_acl - Check for duplicated "struct tomoyo_path_acl" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if @a == @b except permission bits, false otherwise.
+ */
static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a,
const struct tomoyo_acl_info *b)
{
const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head);
const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head);
- return tomoyo_same_acl_head(&p1->head, &p2->head) &&
- tomoyo_same_name_union(&p1->name, &p2->name);
+ return tomoyo_same_name_union(&p1->name, &p2->name);
}
/**
@@ -364,23 +455,37 @@
return error;
}
+/**
+ * tomoyo_same_mkdev_acl - Check for duplicated "struct tomoyo_mkdev_acl" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if @a == @b except permission bits, false otherwise.
+ */
static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a,
const struct tomoyo_acl_info *b)
{
- const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1),
- head);
- const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2),
- head);
- return tomoyo_same_acl_head(&p1->head, &p2->head)
- && tomoyo_same_name_union(&p1->name, &p2->name)
- && tomoyo_same_number_union(&p1->mode, &p2->mode)
- && tomoyo_same_number_union(&p1->major, &p2->major)
- && tomoyo_same_number_union(&p1->minor, &p2->minor);
+ const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1), head);
+ const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2), head);
+ return tomoyo_same_name_union(&p1->name, &p2->name) &&
+ tomoyo_same_number_union(&p1->mode, &p2->mode) &&
+ tomoyo_same_number_union(&p1->major, &p2->major) &&
+ tomoyo_same_number_union(&p1->minor, &p2->minor);
}
+/**
+ * tomoyo_merge_mkdev_acl - Merge duplicated "struct tomoyo_mkdev_acl" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ * @is_delete: True for @a &= ~@b, false for @a |= @b.
+ *
+ * Returns true if @a is empty, false otherwise.
+ */
static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a,
- struct tomoyo_acl_info *b,
- const bool is_delete)
+ struct tomoyo_acl_info *b,
+ const bool is_delete)
{
u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl,
head)->perm;
@@ -411,9 +516,9 @@
* Caller holds tomoyo_read_lock().
*/
static int tomoyo_update_mkdev_acl(const u8 type, const char *filename,
- char *mode, char *major, char *minor,
- struct tomoyo_domain_info * const
- domain, const bool is_delete)
+ char *mode, char *major, char *minor,
+ struct tomoyo_domain_info * const domain,
+ const bool is_delete)
{
struct tomoyo_mkdev_acl e = {
.head.type = TOMOYO_TYPE_MKDEV_ACL,
@@ -436,16 +541,32 @@
return error;
}
+/**
+ * tomoyo_same_path2_acl - Check for duplicated "struct tomoyo_path2_acl" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if @a == @b except permission bits, false otherwise.
+ */
static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a,
const struct tomoyo_acl_info *b)
{
const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head);
const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head);
- return tomoyo_same_acl_head(&p1->head, &p2->head)
- && tomoyo_same_name_union(&p1->name1, &p2->name1)
- && tomoyo_same_name_union(&p1->name2, &p2->name2);
+ return tomoyo_same_name_union(&p1->name1, &p2->name1) &&
+ tomoyo_same_name_union(&p1->name2, &p2->name2);
}
+/**
+ * tomoyo_merge_path2_acl - Merge duplicated "struct tomoyo_path2_acl" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ * @is_delete: True for @a &= ~@b, false for @a |= @b.
+ *
+ * Returns true if @a is empty, false otherwise.
+ */
static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a,
struct tomoyo_acl_info *b,
const bool is_delete)
@@ -532,6 +653,14 @@
return error;
}
+/**
+ * tomoyo_same_path_number_acl - Check for duplicated "struct tomoyo_path_number_acl" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if @a == @b except permission bits, false otherwise.
+ */
static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a,
const struct tomoyo_acl_info *b)
{
@@ -539,11 +668,19 @@
head);
const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2),
head);
- return tomoyo_same_acl_head(&p1->head, &p2->head)
- && tomoyo_same_name_union(&p1->name, &p2->name)
- && tomoyo_same_number_union(&p1->number, &p2->number);
+ return tomoyo_same_name_union(&p1->name, &p2->name) &&
+ tomoyo_same_number_union(&p1->number, &p2->number);
}
+/**
+ * tomoyo_merge_path_number_acl - Merge duplicated "struct tomoyo_path_number_acl" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ * @is_delete: True for @a &= ~@b, false for @a |= @b.
+ *
+ * Returns true if @a is empty, false otherwise.
+ */
static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a,
struct tomoyo_acl_info *b,
const bool is_delete)
@@ -575,8 +712,7 @@
static int tomoyo_update_path_number_acl(const u8 type, const char *filename,
char *number,
struct tomoyo_domain_info * const
- domain,
- const bool is_delete)
+ domain, const bool is_delete)
{
struct tomoyo_path_number_acl e = {
.head.type = TOMOYO_TYPE_PATH_NUMBER_ACL,
@@ -737,7 +873,7 @@
* Returns 0 on success, negative value otherwise.
*/
int tomoyo_mkdev_perm(const u8 operation, struct path *path,
- const unsigned int mode, unsigned int dev)
+ const unsigned int mode, unsigned int dev)
{
struct tomoyo_request_info r;
int error = -ENOMEM;
diff --git a/security/tomoyo/gc.c b/security/tomoyo/gc.c
index ba799b4..de14030 100644
--- a/security/tomoyo/gc.c
+++ b/security/tomoyo/gc.c
@@ -13,13 +13,30 @@
struct tomoyo_gc {
struct list_head list;
- int type;
+ enum tomoyo_policy_id type;
struct list_head *element;
};
static LIST_HEAD(tomoyo_gc_queue);
static DEFINE_MUTEX(tomoyo_gc_mutex);
-/* Caller holds tomoyo_policy_lock mutex. */
+/**
+ * tomoyo_add_to_gc - Add an entry to to be deleted list.
+ *
+ * @type: One of values in "enum tomoyo_policy_id".
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns true on success, false otherwise.
+ *
+ * Caller holds tomoyo_policy_lock mutex.
+ *
+ * Adding an entry needs kmalloc(). Thus, if we try to add thousands of
+ * entries at once, it will take too long time. Thus, do not add more than 128
+ * entries per a scan. But to be able to handle worst case where all entries
+ * are in-use, we accept one more entry per a scan.
+ *
+ * If we use singly linked list using "struct list_head"->prev (which is
+ * LIST_POISON2), we can avoid kmalloc().
+ */
static bool tomoyo_add_to_gc(const int type, struct list_head *element)
{
struct tomoyo_gc *entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
@@ -32,6 +49,13 @@
return true;
}
+/**
+ * tomoyo_del_transition_control - Delete members in "struct tomoyo_transition_control".
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
static void tomoyo_del_transition_control(struct list_head *element)
{
struct tomoyo_transition_control *ptr =
@@ -40,6 +64,13 @@
tomoyo_put_name(ptr->program);
}
+/**
+ * tomoyo_del_aggregator - Delete members in "struct tomoyo_aggregator".
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
static void tomoyo_del_aggregator(struct list_head *element)
{
struct tomoyo_aggregator *ptr =
@@ -48,6 +79,13 @@
tomoyo_put_name(ptr->aggregated_name);
}
+/**
+ * tomoyo_del_manager - Delete members in "struct tomoyo_manager".
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
static void tomoyo_del_manager(struct list_head *element)
{
struct tomoyo_manager *ptr =
@@ -55,6 +93,13 @@
tomoyo_put_name(ptr->manager);
}
+/**
+ * tomoyo_del_acl - Delete members in "struct tomoyo_acl_info".
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
static void tomoyo_del_acl(struct list_head *element)
{
struct tomoyo_acl_info *acl =
@@ -145,12 +190,26 @@
}
+/**
+ * tomoyo_del_name - Delete members in "struct tomoyo_name".
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
static void tomoyo_del_name(struct list_head *element)
{
const struct tomoyo_name *ptr =
- container_of(element, typeof(*ptr), list);
+ container_of(element, typeof(*ptr), head.list);
}
+/**
+ * tomoyo_del_path_group - Delete members in "struct tomoyo_path_group".
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
static void tomoyo_del_path_group(struct list_head *element)
{
struct tomoyo_path_group *member =
@@ -158,20 +217,43 @@
tomoyo_put_name(member->member_name);
}
+/**
+ * tomoyo_del_group - Delete "struct tomoyo_group".
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
static void tomoyo_del_group(struct list_head *element)
{
struct tomoyo_group *group =
- container_of(element, typeof(*group), list);
+ container_of(element, typeof(*group), head.list);
tomoyo_put_name(group->group_name);
}
+/**
+ * tomoyo_del_number_group - Delete members in "struct tomoyo_number_group".
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
static void tomoyo_del_number_group(struct list_head *element)
{
struct tomoyo_number_group *member =
container_of(element, typeof(*member), head.list);
}
-static bool tomoyo_collect_member(struct list_head *member_list, int id)
+/**
+ * tomoyo_collect_member - Delete elements with "struct tomoyo_acl_head".
+ *
+ * @id: One of values in "enum tomoyo_policy_id".
+ * @member_list: Pointer to "struct list_head".
+ *
+ * Returns true if some elements are deleted, false otherwise.
+ */
+static bool tomoyo_collect_member(const enum tomoyo_policy_id id,
+ struct list_head *member_list)
{
struct tomoyo_acl_head *member;
list_for_each_entry(member, member_list, list) {
@@ -195,13 +277,18 @@
return true;
}
+/**
+ * tomoyo_collect_entry - Scan lists for deleted elements.
+ *
+ * Returns nothing.
+ */
static void tomoyo_collect_entry(void)
{
int i;
if (mutex_lock_interruptible(&tomoyo_policy_lock))
return;
for (i = 0; i < TOMOYO_MAX_POLICY; i++) {
- if (!tomoyo_collect_member(&tomoyo_policy_list[i], i))
+ if (!tomoyo_collect_member(i, &tomoyo_policy_list[i]))
goto unlock;
}
{
@@ -222,10 +309,10 @@
}
for (i = 0; i < TOMOYO_MAX_HASH; i++) {
struct tomoyo_name *ptr;
- list_for_each_entry_rcu(ptr, &tomoyo_name_list[i], list) {
- if (atomic_read(&ptr->users))
+ list_for_each_entry_rcu(ptr, &tomoyo_name_list[i], head.list) {
+ if (atomic_read(&ptr->head.users))
continue;
- if (!tomoyo_add_to_gc(TOMOYO_ID_NAME, &ptr->list))
+ if (!tomoyo_add_to_gc(TOMOYO_ID_NAME, &ptr->head.list))
goto unlock;
}
}
@@ -241,13 +328,14 @@
id = TOMOYO_ID_NUMBER_GROUP;
break;
}
- list_for_each_entry(group, list, list) {
- if (!tomoyo_collect_member(&group->member_list, id))
+ list_for_each_entry(group, list, head.list) {
+ if (!tomoyo_collect_member(id, &group->member_list))
goto unlock;
if (!list_empty(&group->member_list) ||
- atomic_read(&group->users))
+ atomic_read(&group->head.users))
continue;
- if (!tomoyo_add_to_gc(TOMOYO_ID_GROUP, &group->list))
+ if (!tomoyo_add_to_gc(TOMOYO_ID_GROUP,
+ &group->head.list))
goto unlock;
}
}
@@ -291,6 +379,8 @@
case TOMOYO_ID_NUMBER_GROUP:
tomoyo_del_number_group(element);
break;
+ case TOMOYO_MAX_POLICY:
+ break;
}
tomoyo_memory_free(element);
list_del(&p->list);
@@ -298,6 +388,17 @@
}
}
+/**
+ * tomoyo_gc_thread - Garbage collector thread function.
+ *
+ * @unused: Unused.
+ *
+ * In case OOM-killer choose this thread for termination, we create this thread
+ * as a short live thread whenever /sys/kernel/security/tomoyo/ interface was
+ * close()d.
+ *
+ * Returns 0.
+ */
static int tomoyo_gc_thread(void *unused)
{
daemonize("GC for TOMOYO");
diff --git a/security/tomoyo/memory.c b/security/tomoyo/memory.c
index 42a7b1b..dfef0cb 100644
--- a/security/tomoyo/memory.c
+++ b/security/tomoyo/memory.c
@@ -110,10 +110,10 @@
return NULL;
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
- list_for_each_entry(group, &tomoyo_group_list[idx], list) {
+ list_for_each_entry(group, &tomoyo_group_list[idx], head.list) {
if (e.group_name != group->group_name)
continue;
- atomic_inc(&group->users);
+ atomic_inc(&group->head.users);
found = true;
break;
}
@@ -121,8 +121,8 @@
struct tomoyo_group *entry = tomoyo_commit_ok(&e, sizeof(e));
if (entry) {
INIT_LIST_HEAD(&entry->member_list);
- atomic_set(&entry->users, 1);
- list_add_tail_rcu(&entry->list,
+ atomic_set(&entry->head.users, 1);
+ list_add_tail_rcu(&entry->head.list,
&tomoyo_group_list[idx]);
group = entry;
found = true;
@@ -164,10 +164,10 @@
head = &tomoyo_name_list[hash_long(hash, TOMOYO_HASH_BITS)];
if (mutex_lock_interruptible(&tomoyo_policy_lock))
return NULL;
- list_for_each_entry(ptr, head, list) {
+ list_for_each_entry(ptr, head, head.list) {
if (hash != ptr->entry.hash || strcmp(name, ptr->entry.name))
continue;
- atomic_inc(&ptr->users);
+ atomic_inc(&ptr->head.users);
goto out;
}
ptr = kzalloc(sizeof(*ptr) + len, GFP_NOFS);
@@ -183,9 +183,9 @@
atomic_add(allocated_len, &tomoyo_policy_memory_size);
ptr->entry.name = ((char *) ptr) + sizeof(*ptr);
memmove((char *) ptr->entry.name, name, len);
- atomic_set(&ptr->users, 1);
+ atomic_set(&ptr->head.users, 1);
tomoyo_fill_path_info(&ptr->entry);
- list_add_tail(&ptr->list, head);
+ list_add_tail(&ptr->head.list, head);
out:
mutex_unlock(&tomoyo_policy_lock);
return ptr ? &ptr->entry : NULL;
diff --git a/security/tomoyo/mount.c b/security/tomoyo/mount.c
index 5cfc720..7649dbc 100644
--- a/security/tomoyo/mount.c
+++ b/security/tomoyo/mount.c
@@ -52,16 +52,28 @@
r->param.mount.dir->name, type, flags);
}
+/**
+ * tomoyo_check_mount_acl - Check permission for path path path number operation.
+ *
+ * @r: Pointer to "struct tomoyo_request_info".
+ * @ptr: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if granted, false otherwise.
+ */
static bool tomoyo_check_mount_acl(struct tomoyo_request_info *r,
const struct tomoyo_acl_info *ptr)
{
const struct tomoyo_mount_acl *acl =
container_of(ptr, typeof(*acl), head);
- return tomoyo_compare_number_union(r->param.mount.flags, &acl->flags) &&
- tomoyo_compare_name_union(r->param.mount.type, &acl->fs_type) &&
- tomoyo_compare_name_union(r->param.mount.dir, &acl->dir_name) &&
+ return tomoyo_compare_number_union(r->param.mount.flags,
+ &acl->flags) &&
+ tomoyo_compare_name_union(r->param.mount.type,
+ &acl->fs_type) &&
+ tomoyo_compare_name_union(r->param.mount.dir,
+ &acl->dir_name) &&
(!r->param.mount.need_dev ||
- tomoyo_compare_name_union(r->param.mount.dev, &acl->dev_name));
+ tomoyo_compare_name_union(r->param.mount.dev,
+ &acl->dev_name));
}
/**
@@ -232,13 +244,20 @@
return error;
}
+/**
+ * tomoyo_same_mount_acl - Check for duplicated "struct tomoyo_mount_acl" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
static bool tomoyo_same_mount_acl(const struct tomoyo_acl_info *a,
const struct tomoyo_acl_info *b)
{
const struct tomoyo_mount_acl *p1 = container_of(a, typeof(*p1), head);
const struct tomoyo_mount_acl *p2 = container_of(b, typeof(*p2), head);
- return tomoyo_same_acl_head(&p1->head, &p2->head) &&
- tomoyo_same_name_union(&p1->dev_name, &p2->dev_name) &&
+ return tomoyo_same_name_union(&p1->dev_name, &p2->dev_name) &&
tomoyo_same_name_union(&p1->dir_name, &p2->dir_name) &&
tomoyo_same_name_union(&p1->fs_type, &p2->fs_type) &&
tomoyo_same_number_union(&p1->flags, &p2->flags);
diff --git a/security/tomoyo/securityfs_if.c b/security/tomoyo/securityfs_if.c
index a5bd76d..6410868 100644
--- a/security/tomoyo/securityfs_if.c
+++ b/security/tomoyo/securityfs_if.c
@@ -34,7 +34,7 @@
*/
static int tomoyo_release(struct inode *inode, struct file *file)
{
- return tomoyo_close_control(file);
+ return tomoyo_close_control(file->private_data);
}
/**
@@ -63,7 +63,7 @@
static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count,
loff_t *ppos)
{
- return tomoyo_read_control(file, buf, count);
+ return tomoyo_read_control(file->private_data, buf, count);
}
/**
@@ -79,7 +79,7 @@
static ssize_t tomoyo_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
- return tomoyo_write_control(file, buf, count);
+ return tomoyo_write_control(file->private_data, buf, count);
}
/*
diff --git a/security/tomoyo/util.c b/security/tomoyo/util.c
index 7fb9bbf..abb177c 100644
--- a/security/tomoyo/util.c
+++ b/security/tomoyo/util.c
@@ -21,7 +21,7 @@
* @result: Pointer to "unsigned long".
* @str: Pointer to string to parse.
*
- * Returns value type on success, 0 otherwise.
+ * Returns one of values in "enum tomoyo_value_type".
*
* The @src is updated to point the first character after the value
* on success.
@@ -43,7 +43,7 @@
}
*result = simple_strtoul(cp, &ep, base);
if (cp == ep)
- return 0;
+ return TOMOYO_VALUE_TYPE_INVALID;
*str = ep;
switch (base) {
case 16:
@@ -93,11 +93,9 @@
return false;
if (filename[0] == '@') {
ptr->group = tomoyo_get_group(filename + 1, TOMOYO_PATH_GROUP);
- ptr->is_group = true;
return ptr->group != NULL;
}
ptr->filename = tomoyo_get_name(filename);
- ptr->is_group = false;
return ptr->filename != NULL;
}
@@ -118,17 +116,16 @@
if (!tomoyo_correct_word(data))
return false;
num->group = tomoyo_get_group(data + 1, TOMOYO_NUMBER_GROUP);
- num->is_group = true;
return num->group != NULL;
}
type = tomoyo_parse_ulong(&v, &data);
if (!type)
return false;
num->values[0] = v;
- num->min_type = type;
+ num->value_type[0] = type;
if (!*data) {
num->values[1] = v;
- num->max_type = type;
+ num->value_type[1] = type;
return true;
}
if (*data++ != '-')
@@ -137,7 +134,7 @@
if (!type || *data)
return false;
num->values[1] = v;
- num->max_type = type;
+ num->value_type[1] = type;
return true;
}
@@ -185,6 +182,30 @@
}
/**
+ * tomoyo_valid - Check whether the character is a valid char.
+ *
+ * @c: The character to check.
+ *
+ * Returns true if @c is a valid character, false otherwise.
+ */
+static inline bool tomoyo_valid(const unsigned char c)
+{
+ return c > ' ' && c < 127;
+}
+
+/**
+ * tomoyo_invalid - Check whether the character is an invalid char.
+ *
+ * @c: The character to check.
+ *
+ * Returns true if @c is an invalid character, false otherwise.
+ */
+static inline bool tomoyo_invalid(const unsigned char c)
+{
+ return c && (c <= ' ' || c >= 127);
+}
+
+/**
* tomoyo_str_starts - Check whether the given string starts with the given keyword.
*
* @src: Pointer to pointer to the string.