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6d2b6f0a5f
Summary: An implementation of ubsan runtime library suitable for use in production. Minimal attack surface. * No stack traces. * Definitely no C++ demangling. * No UBSAN_OPTIONS=log_file=/path (very suid-unfriendly). And no UBSAN_OPTIONS in general. * as simple as possible Minimal CPU and RAM overhead. * Source locations unnecessary in the presence of (split) debug info. * Values and types (as in A+B overflows T) can be reconstructed from register/stack dumps, once you know what type of error you are looking at. * above two items save 3% binary size. When UBSan is used with -ftrap-function=abort, sometimes it is hard to reason about failures. This library replaces abort with a slightly more informative message without much extra overhead. Since ubsan interface in not stable, this code must reside in compiler-rt. Reviewers: pcc, kcc Subscribers: srhines, mgorny, aprantl, krytarowski, llvm-commits Differential Revision: https://reviews.llvm.org/D36810 llvm-svn: 312029
22 lines
619 B
C
22 lines
619 B
C
// RUN: %clang_cc1 -triple x86_64-linux-gnu -fsanitize=unsigned-integer-overflow -fsanitize-minimal-runtime %s -emit-llvm -o - | FileCheck %s
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unsigned long li, lj, lk;
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// CHECK-LABEL: define void @testlongadd()
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void testlongadd() {
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// CHECK: call void @__ubsan_handle_add_overflow_minimal_abort()
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li = lj + lk;
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}
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// CHECK-LABEL: define void @testlongsub()
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void testlongsub() {
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// CHECK: call void @__ubsan_handle_sub_overflow_minimal_abort()
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li = lj - lk;
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}
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// CHECK-LABEL: define void @testlongmul()
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void testlongmul() {
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// CHECK: call void @__ubsan_handle_mul_overflow_minimal_abort()
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li = lj * lk;
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}
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