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The MSG_TRUNC flag makes recvmsg return the real length of the packet, even if it was too big to fit in the provided buffer. This is commonly used together with MSG_PEEK. Without this patch, dfsan's clear_msghdr_labels expects the return value of recvmsg (size recieved) to be less than or equal to the iov buffer length where recvmsg writes data, resulting in a crash.
Compiler-RT ================================ This directory and its subdirectories contain source code for the compiler support routines. Compiler-RT is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. ================================