sanitize AUDIT_MQ_SENDRECV
* logging the original value of *msg_prio in mq_timedreceive(2)
is insane - the argument is write-only (i.e. syscall always
ignores the original value and only overwrites it).
* merge __audit_mq_timed{send,receive}
* don't do copy_from_user() twice
* don't mess with allocations in auditsc part
* ... and don't bother checking !audit_enabled and !context in there -
we'd already checked for audit_dummy_context().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index e7b2f68..192da80 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -524,31 +524,27 @@
wake_up(&info->wait_q);
}
-static long prepare_timeout(const struct timespec __user *u_arg)
+static long prepare_timeout(struct timespec *p)
{
- struct timespec ts, nowts;
+ struct timespec nowts;
long timeout;
- if (u_arg) {
- if (unlikely(copy_from_user(&ts, u_arg,
- sizeof(struct timespec))))
- return -EFAULT;
-
- if (unlikely(ts.tv_nsec < 0 || ts.tv_sec < 0
- || ts.tv_nsec >= NSEC_PER_SEC))
+ if (p) {
+ if (unlikely(p->tv_nsec < 0 || p->tv_sec < 0
+ || p->tv_nsec >= NSEC_PER_SEC))
return -EINVAL;
nowts = CURRENT_TIME;
/* first subtract as jiffies can't be too big */
- ts.tv_sec -= nowts.tv_sec;
- if (ts.tv_nsec < nowts.tv_nsec) {
- ts.tv_nsec += NSEC_PER_SEC;
- ts.tv_sec--;
+ p->tv_sec -= nowts.tv_sec;
+ if (p->tv_nsec < nowts.tv_nsec) {
+ p->tv_nsec += NSEC_PER_SEC;
+ p->tv_sec--;
}
- ts.tv_nsec -= nowts.tv_nsec;
- if (ts.tv_sec < 0)
+ p->tv_nsec -= nowts.tv_nsec;
+ if (p->tv_sec < 0)
return 0;
- timeout = timespec_to_jiffies(&ts) + 1;
+ timeout = timespec_to_jiffies(p) + 1;
} else
return MAX_SCHEDULE_TIMEOUT;
@@ -829,17 +825,22 @@
struct ext_wait_queue *receiver;
struct msg_msg *msg_ptr;
struct mqueue_inode_info *info;
+ struct timespec ts, *p = NULL;
long timeout;
int ret;
- ret = audit_mq_timedsend(mqdes, msg_len, msg_prio, u_abs_timeout);
- if (ret != 0)
- return ret;
+ if (u_abs_timeout) {
+ if (copy_from_user(&ts, u_abs_timeout,
+ sizeof(struct timespec)))
+ return -EFAULT;
+ p = &ts;
+ }
if (unlikely(msg_prio >= (unsigned long) MQ_PRIO_MAX))
return -EINVAL;
- timeout = prepare_timeout(u_abs_timeout);
+ audit_mq_sendrecv(mqdes, msg_len, msg_prio, p);
+ timeout = prepare_timeout(p);
ret = -EBADF;
filp = fget(mqdes);
@@ -918,12 +919,17 @@
struct inode *inode;
struct mqueue_inode_info *info;
struct ext_wait_queue wait;
+ struct timespec ts, *p = NULL;
- ret = audit_mq_timedreceive(mqdes, msg_len, u_msg_prio, u_abs_timeout);
- if (ret != 0)
- return ret;
+ if (u_abs_timeout) {
+ if (copy_from_user(&ts, u_abs_timeout,
+ sizeof(struct timespec)))
+ return -EFAULT;
+ p = &ts;
+ }
- timeout = prepare_timeout(u_abs_timeout);
+ audit_mq_sendrecv(mqdes, msg_len, 0, p);
+ timeout = prepare_timeout(p);
ret = -EBADF;
filp = fget(mqdes);