[cfe-dev] [PATCH] Integer Sanitizer Initial Patches

Will Dietz willdtz at gmail.com
Wed Nov 7 17:15:44 PST 2012

Hi all,

Attached are patches that add a new 'sanitizer' to clang for detecting
and reporting integer overfllows.  Unlike the checks added by
-fcatch-undefined-behavior, these also include non-undefined-behavior

The attached clang patch adds:


The first adds support for inserting checks for unsigned integer
overflow, the latter is a new 'sanitizer group' which is used to
enable all integer-related checking.  In the future I'd like to
include value-losing conversions, but for now this includes the
existing checks (signed overflow, divide-by-zero, shifts) as well as
the new unsigned overflow checks.

Also attached is a corresponding patch for compiler-rt that extends
ubsan to include support for reporting unsigned as well as signed

Two issues with this that I'm hoping can be discussed:
* As per PR14247 (http://llvm.org/bugs/show_bug.cgi?id=14247), the
ubsan checks presently aren't recoverable.  This reduces these checks'
utility for quickly getting a new large codebase into shape as
mentioned in that bug, but this is of course even more important to be
made optional when reporting unsigned overflows is enabled as well.

* Extending "ubsan" is unfortunate given its name, but these checks
don't seem to merit a separate library either.  Thoughts?

Thank you for your time and looking forward to your comments.


**Written during the LLVM Hacker's Lab :) **
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