[PATCH netdev] "wrong timeout value" in sk_wait_data() v2

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



sys_setsockopt() do not check properly timeout values for
SO_RCVTIMEO/SO_SNDTIMEO, for example it's possible to set negative timeout
values. POSIX do not defines behaviour for sys_setsockopt in case negative
timeouts, but requires that setsockopt() shall fail with -EDOM if the send and
receive timeout values are too big to fit into the timeout fields in the socket
structure.
In current implementation negative timeout can lead to error messages like
"schedule_timeout: wrong timeout value".

Proposed patch:
- checks tv_usec and returns -EDOM if it is wrong
- do not allows to set negative timeout values (sets 0 instead) and outputs
ratelimited information message about such attempts.

Signed-Off-By:	Vasily Averin <[email protected]>

diff --git a/net/core/sock.c b/net/core/sock.c
index 22183c2..7e51d3a 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -206,7 +206,19 @@ static int sock_set_timeout(long *timeo_p, char __user
*optval, int optlen)
 		return -EINVAL;
 	if (copy_from_user(&tv, optval, sizeof(tv)))
 		return -EFAULT;
-
+	if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
+		return -EDOM;
+
+	if (tv.tv_sec < 0) {
+		static int warned = 0;
+		*timeo_p = 0;
+		if (warned < 10 && net_ratelimit())
+			warned++;
+			printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
+			       "tries to set negative timeout\n",
+			        current->comm, current->pid);
+		return 0;
+	}
 	*timeo_p = MAX_SCHEDULE_TIMEOUT;
 	if (tv.tv_sec == 0 && tv.tv_usec == 0)
 		return 0;
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux