TOMOYO: Return appropriate value to poll().
"struct file_operations"->poll() expects "unsigned int" return value.
All files in /sys/kernel/security/tomoyo/ directory other than
/sys/kernel/security/tomoyo/query and /sys/kernel/security/tomoyo/audit should
return POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM rather than -ENOSYS.
Also, /sys/kernel/security/tomoyo/query and /sys/kernel/security/tomoyo/audit
should return POLLOUT | POLLWRNORM rather than 0 when there is no data to read.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <james.l.morris@oracle.com>
diff --git a/security/tomoyo/audit.c b/security/tomoyo/audit.c
index 5ca47ea..7ef9fa3 100644
--- a/security/tomoyo/audit.c
+++ b/security/tomoyo/audit.c
@@ -446,11 +446,11 @@
* tomoyo_poll_log - Wait for an audit log.
*
* @file: Pointer to "struct file".
- * @wait: Pointer to "poll_table".
+ * @wait: Pointer to "poll_table". Maybe NULL.
*
* Returns POLLIN | POLLRDNORM when ready to read an audit log.
*/
-int tomoyo_poll_log(struct file *file, poll_table *wait)
+unsigned int tomoyo_poll_log(struct file *file, poll_table *wait)
{
if (tomoyo_log_count)
return POLLIN | POLLRDNORM;
diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
index c47d3ce..d8561c3 100644
--- a/security/tomoyo/common.c
+++ b/security/tomoyo/common.c
@@ -2111,7 +2111,7 @@
struct tomoyo_domain_info *domain = NULL;
spin_lock(&tomoyo_query_list_lock);
list_for_each_entry(ptr, &tomoyo_query_list, list) {
- if (ptr->serial != serial || ptr->answer)
+ if (ptr->serial != serial)
continue;
domain = ptr->domain;
break;
@@ -2130,28 +2130,13 @@
*
* Waits for access requests which violated policy in enforcing mode.
*/
-static int tomoyo_poll_query(struct file *file, poll_table *wait)
+static unsigned int tomoyo_poll_query(struct file *file, poll_table *wait)
{
- struct list_head *tmp;
- bool found = false;
- u8 i;
- for (i = 0; i < 2; i++) {
- spin_lock(&tomoyo_query_list_lock);
- list_for_each(tmp, &tomoyo_query_list) {
- struct tomoyo_query *ptr =
- list_entry(tmp, typeof(*ptr), list);
- if (ptr->answer)
- continue;
- found = true;
- break;
- }
- spin_unlock(&tomoyo_query_list_lock);
- if (found)
- return POLLIN | POLLRDNORM;
- if (i)
- break;
- poll_wait(file, &tomoyo_query_wait, wait);
- }
+ if (!list_empty(&tomoyo_query_list))
+ return POLLIN | POLLRDNORM;
+ poll_wait(file, &tomoyo_query_wait, wait);
+ if (!list_empty(&tomoyo_query_list))
+ return POLLIN | POLLRDNORM;
return 0;
}
@@ -2175,8 +2160,6 @@
spin_lock(&tomoyo_query_list_lock);
list_for_each(tmp, &tomoyo_query_list) {
struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
- if (ptr->answer)
- continue;
if (pos++ != head->r.query_index)
continue;
len = ptr->query_len;
@@ -2194,8 +2177,6 @@
spin_lock(&tomoyo_query_list_lock);
list_for_each(tmp, &tomoyo_query_list) {
struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
- if (ptr->answer)
- continue;
if (pos++ != head->r.query_index)
continue;
/*
@@ -2243,8 +2224,10 @@
struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
if (ptr->serial != serial)
continue;
- if (!ptr->answer)
- ptr->answer = answer;
+ ptr->answer = answer;
+ /* Remove from tomoyo_query_list. */
+ if (ptr->answer)
+ list_del_init(&ptr->list);
break;
}
spin_unlock(&tomoyo_query_list_lock);
@@ -2477,18 +2460,17 @@
* tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
*
* @file: Pointer to "struct file".
- * @wait: Pointer to "poll_table".
+ * @wait: Pointer to "poll_table". Maybe NULL.
*
- * Waits for read readiness.
- * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and
- * /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd.
+ * Returns POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM if ready to read/write,
+ * POLLOUT | POLLWRNORM otherwise.
*/
-int tomoyo_poll_control(struct file *file, poll_table *wait)
+unsigned int tomoyo_poll_control(struct file *file, poll_table *wait)
{
struct tomoyo_io_buffer *head = file->private_data;
- if (!head->poll)
- return -ENOSYS;
- return head->poll(file, wait);
+ if (head->poll)
+ return head->poll(file, wait) | POLLOUT | POLLWRNORM;
+ return POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM;
}
/**
diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h
index 9512222..30fd983 100644
--- a/security/tomoyo/common.h
+++ b/security/tomoyo/common.h
@@ -788,7 +788,7 @@
struct tomoyo_io_buffer {
void (*read) (struct tomoyo_io_buffer *);
int (*write) (struct tomoyo_io_buffer *);
- int (*poll) (struct file *file, poll_table *wait);
+ unsigned int (*poll) (struct file *file, poll_table *wait);
/* Exclusive lock for this structure. */
struct mutex io_sem;
char __user *read_user_buf;
@@ -981,8 +981,8 @@
unsigned long number);
int tomoyo_path_perm(const u8 operation, struct path *path,
const char *target);
-int tomoyo_poll_control(struct file *file, poll_table *wait);
-int tomoyo_poll_log(struct file *file, poll_table *wait);
+unsigned int tomoyo_poll_control(struct file *file, poll_table *wait);
+unsigned int tomoyo_poll_log(struct file *file, poll_table *wait);
int tomoyo_socket_bind_permission(struct socket *sock, struct sockaddr *addr,
int addr_len);
int tomoyo_socket_connect_permission(struct socket *sock,
diff --git a/security/tomoyo/securityfs_if.c b/security/tomoyo/securityfs_if.c
index 482b2a5..8592f2f 100644
--- a/security/tomoyo/securityfs_if.c
+++ b/security/tomoyo/securityfs_if.c
@@ -157,9 +157,10 @@
* tomoyo_poll - poll() for /sys/kernel/security/tomoyo/ interface.
*
* @file: Pointer to "struct file".
- * @wait: Pointer to "poll_table".
+ * @wait: Pointer to "poll_table". Maybe NULL.
*
- * Returns 0 on success, negative value otherwise.
+ * Returns POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM if ready to read/write,
+ * POLLOUT | POLLWRNORM otherwise.
*/
static unsigned int tomoyo_poll(struct file *file, poll_table *wait)
{