HomePhabricator

Minimal runtime for UBSan.

Authored by eugenis on Aug 29 2017, 1:03 PM.

Description

Minimal runtime for UBSan.

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

Details

Committed
eugenisAug 29 2017, 1:03 PM
Differential Revision
D36810: Minimal runtime for UBSan.
Parents
rG75fa173e202c: [llvm-rc] Fix DIALOG(EX) parsing ability (parser, pt 5/8).
Branches
Unknown
Tags
Unknown