common: Add mandatory length field to UDP receive calls
Current UDP receive reads up to MAX_UDP_LENGTH bytes into the passed in buffer, which may lead to buffer overflow if the write buffer is of insufficient size. Add mandatory length argument to UDP socket receive calls. Reported-by: Simone Margaritelli <simone@zimperium.com> Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
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29ef2c82db
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cbb5d790e5
22
Sockets.cpp
22
Sockets.cpp
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@ -199,25 +199,21 @@ int DatagramSocket::send(const struct sockaddr* dest, const char * message)
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return send(dest,message,length);
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}
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int DatagramSocket::read(char* buffer)
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int DatagramSocket::read(char* buffer, size_t length)
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{
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socklen_t temp_len = sizeof(mSource);
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int length = recvfrom(mSocketFD, (void*)buffer, MAX_UDP_LENGTH, 0,
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(struct sockaddr*)&mSource,&temp_len);
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if ((length==-1) && (errno!=EAGAIN)) {
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socklen_t addr_len = sizeof(mSource);
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int rd_length = recvfrom(mSocketFD, (void *) buffer, length, 0,
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(struct sockaddr*) &mSource, &addr_len);
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if ((rd_length==-1) && (errno!=EAGAIN)) {
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perror("DatagramSocket::read() failed");
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devassert(0);
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throw SocketError();
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}
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return length;
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return rd_length;
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}
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int DatagramSocket::read(char* buffer, unsigned timeout)
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int DatagramSocket::read(char* buffer, size_t length, unsigned timeout)
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{
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fd_set fds;
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FD_ZERO(&fds);
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@ -232,7 +228,7 @@ int DatagramSocket::read(char* buffer, unsigned timeout)
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throw SocketError();
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}
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if (sel==0) return -1;
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if (FD_ISSET(mSocketFD,&fds)) return read(buffer);
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if (FD_ISSET(mSocketFD,&fds)) return read(buffer, length);
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return -1;
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}
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@ -110,7 +110,7 @@ public:
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@param buffer A char[MAX_UDP_LENGTH] procured by the caller.
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@return The number of bytes received or -1 on non-blocking pass.
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*/
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int read(char* buffer);
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int read(char* buffer, size_t length);
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/**
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Receive a packet with a timeout.
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@ -118,7 +118,7 @@ public:
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@param maximum wait time in milliseconds
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@return The number of bytes received or -1 on timeout.
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*/
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int read(char* buffer, unsigned timeout);
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int read(char* buffer, size_t length, unsigned timeout);
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/** Send a packet to a given destination, other than the default. */
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@ -45,7 +45,7 @@ void *testReaderIP(void *)
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int rc = 0;
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while (rc<gNumToSend) {
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char buf[MAX_UDP_LENGTH];
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int count = readSocket.read(buf);
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int count = readSocket.read(buf, MAX_UDP_LENGTH);
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if (count>0) {
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COUT("read: " << buf);
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rc++;
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@ -65,7 +65,7 @@ void *testReaderUnix(void *)
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int rc = 0;
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while (rc<gNumToSend) {
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char buf[MAX_UDP_LENGTH];
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int count = readSocket.read(buf);
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int count = readSocket.read(buf, MAX_UDP_LENGTH);
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if (count>0) {
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COUT("read: " << buf);
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rc++;
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