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Reliable Datagram Sockets
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Reliable Datagram Sockets (RDS) is a high-performance, low-latency, reliable, connectionless protocol for delivering datagrams. It is developed by Oracle Corporation.
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It was included in the Linux kernel 2.6.30 which was released on 9 June 2009. The code was contributed by the OpenFabrics Alliance (OFA).[1]
On October 19, 2010, VSR announced CVE-2010-3904, a vulnerability within the Linux 2.6.30 kernel which could result in a local privilege escalation via the kernel's implementation of RDS.[2] This was subsequently fixed in Linux 2.6.36.[3]
On May 8, 2019, CVE-2019-11815 was published, regarding a race condition in the Linux RDS implementation that could lead to a use-after-free bug and possible arbitrary code execution.[4] The bug has been fixed in Linux 5.0.8.
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Header
- Sequence (h_sequence): 64 bits:The sequence number.
- Acknowledge (h_ack): 64 bits:The sequence number of last received message.
- Length (h_len): 32 bits:The length of the message payload.
- Source Port (h_sport): 16 bits:Identifies the sending port.
- Destination Port (h_dport): 16 bits:Identifies the receiving port.
- Flags (h_flags): 8 bits:Described below.
- Credits (h_credit): 8 bits:Credits given (used for credit-based flow control).
- Padding (h_padding): 32 bits:Padding for 64-bit struct alignment.
- Checksum (h_csum): 16 bits:1's complement header checksum.
- Extension Header (h_exthdr): 128 bits:Optional extension header space.
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