[all-commits] [llvm/llvm-project] 3b3d62: [DFSan] Fix recvmsg wrapper to support MSG_TRUNC f...

[Andrew Browne via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3b3d622be993faa985ed9cbb9ab098c8d6b8f681
      https://github.com/llvm/llvm-project/commit/3b3d622be993faa985ed9cbb9ab098c8d6b8f681
  Author: Andrew Browne <browneee at google.com>
  Date:   2024-05-21 (Tue, 21 May 2024)

  Changed paths:
    M compiler-rt/lib/dfsan/dfsan_custom.cpp
    M compiler-rt/test/dfsan/custom.cpp

  Log Message:
  -----------
  [DFSan] Fix recvmsg wrapper to support MSG_TRUNC flag. (#92599)

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.



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