diff options
Diffstat (limited to 'security/tomoyo/common.c')
| -rw-r--r-- | security/tomoyo/common.c | 41 |
1 files changed, 14 insertions, 27 deletions
diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c index 50481d2cf970..691c34025a4a 100644 --- a/security/tomoyo/common.c +++ b/security/tomoyo/common.c @@ -1820,9 +1820,7 @@ static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head) * @type: Type of interface. * @file: Pointer to "struct file". * - * Associates policy handler and returns 0 on success, -ENOMEM otherwise. - * - * Caller acquires tomoyo_read_lock(). + * Returns 0 on success, negative value otherwise. */ int tomoyo_open_control(const u8 type, struct file *file) { @@ -1921,9 +1919,6 @@ int tomoyo_open_control(const u8 type, struct file *file) return -ENOMEM; } } - if (type != TOMOYO_QUERY && type != TOMOYO_AUDIT) - head->reader_idx = tomoyo_read_lock(); - file->private_data = head; /* * If the file is /sys/kernel/security/tomoyo/query , increment the * observer counter. @@ -1932,6 +1927,8 @@ int tomoyo_open_control(const u8 type, struct file *file) */ if (type == TOMOYO_QUERY) atomic_inc(&tomoyo_query_observers); + file->private_data = head; + tomoyo_notify_gc(head, true); return 0; } @@ -2000,13 +1997,12 @@ static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head) * @buffer_len: Size of @buffer. * * Returns bytes read on success, negative value otherwise. - * - * Caller holds tomoyo_read_lock(). */ int tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer, const int buffer_len) { int len; + int idx; if (!head->read) return -ENOSYS; @@ -2014,6 +2010,7 @@ int tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer, return -EINTR; head->read_user_buf = buffer; head->read_user_buf_avail = buffer_len; + idx = tomoyo_read_lock(); if (tomoyo_flush(head)) /* Call the policy handler. */ do { @@ -2021,6 +2018,7 @@ int tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer, head->read(head); } while (tomoyo_flush(head) && tomoyo_has_more_namespace(head)); + tomoyo_read_unlock(idx); len = head->read_user_buf - buffer; mutex_unlock(&head->io_sem); return len; @@ -2071,8 +2069,6 @@ static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line) * @buffer_len: Size of @buffer. * * Returns @buffer_len on success, negative value otherwise. - * - * Caller holds tomoyo_read_lock(). */ int tomoyo_write_control(struct tomoyo_io_buffer *head, const char __user *buffer, const int buffer_len) @@ -2080,12 +2076,14 @@ int tomoyo_write_control(struct tomoyo_io_buffer *head, int error = buffer_len; size_t avail_len = buffer_len; char *cp0 = head->write_buf; + int idx; if (!head->write) return -ENOSYS; if (!access_ok(VERIFY_READ, buffer, buffer_len)) return -EFAULT; if (mutex_lock_interruptible(&head->io_sem)) return -EINTR; + idx = tomoyo_read_lock(); /* Read a line and dispatch it to the policy handler. */ while (avail_len > 0) { char c; @@ -2148,6 +2146,7 @@ int tomoyo_write_control(struct tomoyo_io_buffer *head, } } out: + tomoyo_read_unlock(idx); mutex_unlock(&head->io_sem); return error; } @@ -2157,30 +2156,18 @@ out: * * @head: Pointer to "struct tomoyo_io_buffer". * - * Releases memory and returns 0. - * - * Caller looses tomoyo_read_lock(). + * Returns 0. */ int tomoyo_close_control(struct tomoyo_io_buffer *head) { - const bool is_write = !!head->write_buf; - /* * If the file is /sys/kernel/security/tomoyo/query , decrement the * observer counter. */ - if (head->type == TOMOYO_QUERY) - atomic_dec(&tomoyo_query_observers); - else if (head->type != TOMOYO_AUDIT) - tomoyo_read_unlock(head->reader_idx); - /* Release memory used for policy I/O. */ - kfree(head->read_buf); - head->read_buf = NULL; - kfree(head->write_buf); - head->write_buf = NULL; - kfree(head); - if (is_write) - tomoyo_run_gc(); + if (head->type == TOMOYO_QUERY && + atomic_dec_and_test(&tomoyo_query_observers)) + wake_up_all(&tomoyo_answer_wait); + tomoyo_notify_gc(head, false); return 0; } |