diff options
| author | Matt Morehouse <mascasa@google.com> | 2018-06-27 18:24:46 +0000 |
|---|---|---|
| committer | Matt Morehouse <mascasa@google.com> | 2018-06-27 18:24:46 +0000 |
| commit | e833fe37b0abc09640c727ab55449d6e96a3e61e (patch) | |
| tree | e300a41da507050af44561f2f1d23a0ebe6fe8ed /lib | |
| parent | 1523dfc20a7df45eae863bbe79a3cf768e26fd2f (diff) | |
[UBSan] Add silence_unsigned_overflow flag.
Summary:
Setting UBSAN_OPTIONS=silence_unsigned_overflow=1 will silence all UIO
reports. This feature, combined with
-fsanitize-recover=unsigned-integer-overflow, is useful for providing
fuzzing signal without the excessive log output.
Helps with https://github.com/google/oss-fuzz/issues/910.
Reviewers: kcc, vsk
Reviewed By: vsk
Subscribers: vsk, kubamracek, Dor1s, llvm-commits
Differential Revision: https://reviews.llvm.org/D48660
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@335762 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/ubsan/ubsan_flags.inc | 3 | ||||
| -rw-r--r-- | lib/ubsan/ubsan_handlers.cc | 4 |
2 files changed, 7 insertions, 0 deletions
diff --git a/lib/ubsan/ubsan_flags.inc b/lib/ubsan/ubsan_flags.inc index d171a98e1..1638a054e 100644 --- a/lib/ubsan/ubsan_flags.inc +++ b/lib/ubsan/ubsan_flags.inc @@ -24,3 +24,6 @@ UBSAN_FLAG(bool, print_stacktrace, false, UBSAN_FLAG(const char *, suppressions, "", "Suppressions file name.") UBSAN_FLAG(bool, report_error_type, false, "Print specific error type instead of 'undefined-behavior' in summary.") +UBSAN_FLAG(bool, silence_unsigned_overflow, false, + "Do not print error reports for unsigned integer overflow. " + "Used to provide fuzzing signal without blowing up logs.") diff --git a/lib/ubsan/ubsan_handlers.cc b/lib/ubsan/ubsan_handlers.cc index 59a5a6b72..b48862a9d 100644 --- a/lib/ubsan/ubsan_handlers.cc +++ b/lib/ubsan/ubsan_handlers.cc @@ -15,6 +15,7 @@ #if CAN_SANITIZE_UB #include "ubsan_handlers.h" #include "ubsan_diag.h" +#include "ubsan_flags.h" #include "ubsan_monitor.h" #include "sanitizer_common/sanitizer_common.h" @@ -118,6 +119,9 @@ static void handleIntegerOverflowImpl(OverflowData *Data, ValueHandle LHS, if (ignoreReport(Loc, Opts, ET)) return; + if (!IsSigned && flags()->silence_unsigned_overflow) + return; + ScopedReport R(Opts, Loc, ET); Diag(Loc, DL_Error, ET, "%0 integer overflow: " |