Date: Tue, 13 Jan 2015 14:23:50 -0800 From: "Chris H" <bsd-lists@bsdforge.com> To: <freebsd-current@freebsd.org> Subject: Re: Connected sanitizer libraries to the build (for x86) Message-ID: <16cb4b4f0ffd697fa913197ba163727d@ultimatedns.net> In-Reply-To: <FCF2A752-8B03-45BD-B548-A28FCBB27C7B@FreeBSD.org> References: <FCF2A752-8B03-45BD-B548-A28FCBB27C7B@FreeBSD.org>
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On Tue, 13 Jan 2015 21:28:08 +0100 Dimitry Andric <dim@FreeBSD.org> wrote > Hi, > > In r277146, I have connected the sanitizer libraries from compiler-rt to > the build. Currently, this works for i386 and amd64, and contains > Address Sanitizer (ASan) and Undefined Behavior Sanitizer. > > AddressSanitizer is a fast memory error detector [1]. It consists of a > compiler instrumentation module and a run-time library. The tool can > detect the following types of bugs: > > * Out-of-bounds accesses to heap, stack and globals > * Use-after-free > * Use-after-return (to some extent) > * Double-free, invalid free > * Memory leaks (experimental) > > The typical slowdown introduced by AddressSanitizer is 2x. Enable it by > compiling and linking with clang, and using the -fsanitize=address flag. > > Undefined Behavior Sanitizer is a fast and compatible undefined behavior > checker, which enables a number of checks that have small runtime cost > and no impact on address space layout or ABI. Enable it by using the > -fsanitize=undefined flag. [2] > > Please note that the sanitizers still have some rough edges on FreeBSD, > particularly on i386. These will hopefully be smoothed out in the > coming time. Reports of problems (and fixes :) are very welcome, but > please log them in Bugzilla, so they can be tracked. These looks like welcomed addition(s). Thank you, Dimitry! --Chris > > -Dimitry > > [1] http://llvm.org/releases/3.5.0/tools/clang/docs/AddressSanitizer.html > [2] > http://llvm.org/releases/3.5.0/tools/clang/docs/UsersManual.html#opt-fsanitiz
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