Date: Mon, 7 Mar 2016 13:07:32 -0800 From: Kees Cook <keescook@...omium.org> To: Dmitry Vyukov <dvyukov@...gle.com>, Emese Revfy <re.emese@...il.com> Cc: linux-kbuild <linux-kbuild@...r.kernel.org>, PaX Team <pageexec@...email.hu>, Brad Spengler <spender@...ecurity.net>, "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>, Michal Marek <mmarek@...e.com>, Rasmus Villemoes <linux@...musvillemoes.dk>, Fengguang Wu <fengguang.wu@...el.com>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH v5 5/5] Add sancov plugin On Sun, Mar 6, 2016 at 3:07 PM, Emese Revfy <re.emese@...il.com> wrote: > The sancov gcc plugin inserts a __sanitizer_cov_trace_pc() call > at the start of basic blocks. > > This plugin is a helper plugin for the kcov feature. It supports > all gcc versions with plugin support (from gcc-4.5 on). > It is based on the gcc commit "Add fuzzing coverage support" by Dmitry Vyukov > (https://gcc.gnu.org/viewcvs/gcc?limit_changes=0&view=revision&revision=231296). Very cool! Dmitry, is this something you could put to good use? > [...] > diff --git a/tools/gcc/sancov_plugin.c b/tools/gcc/sancov_plugin.c > new file mode 100644 > index 0000000..5a9179b > --- /dev/null > +++ b/tools/gcc/sancov_plugin.c > @@ -0,0 +1,133 @@ > +/* > + * Copyright 2011-2016 by Emese Revfy <re.emese@...il.com> > + * Licensed under the GPL v2, or (at your option) v3 > + * > + * Homepage: > + * https://github.com/ephox-gcc-plugins/sancov > + * > + * This plugin inserts a __sanitizer_cov_trace_pc() call at the start of basic blocks. > + * It supports all gcc versions with plugin support (from gcc-4.5 on). > + * It is based on the commit "Add fuzzing coverage support" by Dmitry Vyukov <dvyukov@...gle.com>. > + * > + * You can read about it more here: > + * https://gcc.gnu.org/viewcvs/gcc?limit_changes=0&view=revision&revision=231296 > + * http://lwn.net/Articles/674854/ > + * https://github.com/google/syzkaller > + * https://lwn.net/Articles/677764/ > + * > + * Usage: > + * make run Is this accurate? Wouldn't it just be selected from CONFIGs during kernel build? -Kees -- Kees Cook Chrome OS & Brillo Security
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