diff options
| author | Max Moroz <mmoroz@chromium.org> | 2018-07-13 22:49:06 +0000 |
|---|---|---|
| committer | Max Moroz <mmoroz@chromium.org> | 2018-07-13 22:49:06 +0000 |
| commit | bea00ccdf28bfd0f2773a09b0e429f7f6b54c0c9 (patch) | |
| tree | 250281feca633a6627607290dc99e2e25806f24e /lib | |
| parent | 3b0b1758204f24c622fc59812e4dba2813dfa19d (diff) | |
[UBSan] Followup for silence_unsigned_overflow flag to handle negate overflows.
Summary:
That flag has been introduced in https://reviews.llvm.org/D48660 for
suppressing UIO error messages in an efficient way. The main motivation is to
be able to use UIO checks in builds used for fuzzing as it might provide an
interesting signal to a fuzzing engine such as libFuzzer.
See https://github.com/google/oss-fuzz/issues/910 for more information.
Reviewers: morehouse, kcc
Reviewed By: morehouse
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D49324
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@337068 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/ubsan/ubsan_handlers.cc | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/ubsan/ubsan_handlers.cc b/lib/ubsan/ubsan_handlers.cc index b48862a9d..49c6bcacb 100644 --- a/lib/ubsan/ubsan_handlers.cc +++ b/lib/ubsan/ubsan_handlers.cc @@ -156,6 +156,9 @@ static void handleNegateOverflowImpl(OverflowData *Data, ValueHandle OldVal, if (ignoreReport(Loc, Opts, ET)) return; + if (!IsSigned && flags()->silence_unsigned_overflow) + return; + ScopedReport R(Opts, Loc, ET); if (IsSigned) |