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tipc: Abort excessive send requests as early as possible 

Adds checks to TIPC's socket send routines to promptly detect and
abort attempts to send more than 66,000 bytes in a single TIPC
message or more than 2**31-1 bytes in a single TIPC byte stream request.
In addition, this ensures that the number of iovecs in a send request
does not exceed the limits of a standard integer variable.

Signed-off-by: Allan Stephens <Allan.Stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
This commit is contained in:
Allan Stephens 2010-04-20 17:58:24 -04:00 committed by Paul Gortmaker
parent 66e019a6af
commit c29c3f70c9
2 changed files with 14 additions and 1 deletions
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2
include/linux/tipc.h
View File

@ -101,7 +101,7 @@ static inline unsigned int tipc_node(__u32 addr)
* Limiting values for messages
*/
#define TIPC_MAX_USER_MSG_SIZE 66000
#define TIPC_MAX_USER_MSG_SIZE 66000U
/*
* Message importance levels

13
net/tipc/socket.c
View File

@ -535,6 +535,9 @@ static int send_msg(struct kiocb *iocb, struct socket *sock,
if (unlikely((m->msg_namelen < sizeof(*dest)) ||
(dest->family != AF_TIPC)))
return -EINVAL;
if ((total_len > TIPC_MAX_USER_MSG_SIZE) ||
(m->msg_iovlen > (unsigned)INT_MAX))
return -EMSGSIZE;
if (iocb)
lock_sock(sk);
@ -640,6 +643,10 @@ static int send_packet(struct kiocb *iocb, struct socket *sock,
if (unlikely(dest))
return send_msg(iocb, sock, m, total_len);
if ((total_len > TIPC_MAX_USER_MSG_SIZE) ||
(m->msg_iovlen > (unsigned)INT_MAX))
return -EMSGSIZE;
if (iocb)
lock_sock(sk);
@ -723,6 +730,12 @@ static int send_stream(struct kiocb *iocb, struct socket *sock,
goto exit;
}
if ((total_len > (unsigned)INT_MAX) ||
(m->msg_iovlen > (unsigned)INT_MAX)) {
res = -EMSGSIZE;
goto exit;
}
/*
* Send each iovec entry using one or more messages
*