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Roman Lebedev 1d0c7f563c [compiler-rt][UBSan] silence_unsigned_overflow: do *NOT* ignore *fatal* unsigned overflows 
Summary:
D48660 / rL335762 added a `silence_unsigned_overflow` env flag for [[ https://github.com/google/oss-fuzz/pull/1717 | oss-fuzz needs ]],
that allows to silence the reports from unsigned overflows.
It makes sense, it is there because `-fsanitize=integer` sanitizer is not enabled on oss-fuzz,
so this allows to still use it as an interestingness signal, without getting the actual reports.

However there is a slight problem here.
All types of unsigned overflows are ignored.
Even if `-fno-sanitize-recover=unsigned` was used (which means the program will die after the report)
there will still be no report, the program will just silently die.

At the moment there are just two projects on oss-fuzz that care:
* [[ 8eeffa627f/projects/llvm_libcxx/build.sh (L18-L20) | libc++ ]]
* [[ 8eeffa627f/projects/librawspeed/build.sh | RawSpeed ]] (me)

I suppose this could be overridden there ^, but i really don't think this is intended behavior in any case..

Reviewers: kcc, Dor1s, #sanitizers, filcab, vsk, kubamracek

Reviewed By: Dor1s

Subscribers: dberris, mclow.lists, llvm-commits

Tags: #sanitizers

Differential Revision: https://reviews.llvm.org/D54771

llvm-svn: 347415
2018-11-21 20:35:43 +00:00
..
cmake [cmake] Fix detecting terminfo library 2018-11-20 18:41:11 +00:00
docs
include Regenerate syscall hooks for NetBSD 8.99.25 2018-10-30 11:10:36 +00:00
lib [compiler-rt][UBSan] silence_unsigned_overflow: do *NOT* ignore *fatal* unsigned overflows 2018-11-21 20:35:43 +00:00
test [compiler-rt][UBSan] silence_unsigned_overflow: do *NOT* ignore *fatal* unsigned overflows 2018-11-21 20:35:43 +00:00
unittests [XRay] Add LD_LIBRARY_PATH to env variables for Unit Tests 2018-09-27 23:15:05 +00:00
utils Update generate_netbsd_ioctls.awk for NetBSD 8.99.25 2018-10-31 12:52:08 +00:00
www
.arcconfig [compiler-rt] Set up .arcconfig to point to new Diffusion CRT repository 2017-12-06 20:55:32 +00:00
.gitignore Add .pyc files to .gitignore to compiler-rt 2017-07-24 21:51:12 +00:00
CMakeLists.txt [CMake] When built with LLVM, not use -Wl,-z,defs 2018-10-29 22:16:56 +00:00
CODE_OWNERS.TXT
CREDITS.TXT
LICENSE.TXT Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
README.txt

README.txt 

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.

================================