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TOMOYO: Return appropriate value to poll().

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"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>
This commit is contained in:
Tetsuo Handa
2012-03-14 18:27:49 +09:00
committed by James Morris
parent f67dabbdde
commit 6041e8346f
4 changed files with 26 additions and 43 deletions
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54
security/tomoyo/common.c
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@@ -2111,7 +2111,7 @@ static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
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 @@ static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
*
* 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 @@ static void tomoyo_read_query(struct tomoyo_io_buffer *head)
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 @@ static void tomoyo_read_query(struct tomoyo_io_buffer *head)
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 @@ static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
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 @@ int tomoyo_open_control(const u8 type, struct file *file)
* 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;
}
/**