https://llvm.org/bugs/show_bug.cgi?id=27673
Bug ID: 27673
Summary: [ASan] False alarm to recv/recvfrom
Product: compiler-rt
Version: unspecified
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: compiler-rt
Assignee: unassignedb...@nondot.org
Reporter: las...@google.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
ASan checks the return value of real recv/recvfrom to see if the written bytes
fit in the buffer:
https://github.com/llvm-mirror/compiler-rt/commit/c06094fbd7e254dc8ebf03f02d0e9935896829fe
That works fine most of time. However, there is an exception: (from the RECV(2)
man page)
MSG_TRUNC (since Linux 2.2)
... return the real length of the packet or datagram, even when it was
longer than the passed buffer. ...
Some programs combine MSG_TRUNK, MSG_PEEK and a single-byte buffer to peek the
incoming data size without reading (much of) them. In this case, the return
value is usually longer than what's been written and ASan raises a false alarm
here.
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