On Mon, Jan 16, 2017 at 11:54:35AM +0000, Mark Rutland wrote:
> Hi,
>
> [adding Dave, so retaining full context below]
>
> On Fri, Jan 13, 2017 at 02:02:56PM -0800, Kees Cook wrote:
> > This plugin detects any structures that contain __user attributes and
> > makes sure it is being fulling initialized so that a specific class of
>
> Nit: s/fulling/fully/
>
> > information exposure is eliminated. (For example, the exposure of siginfo
> > in CVE-2013-2141 would have been blocked by this plugin.)
> >
> > Ported from grsecurity/PaX. This version adds a verbose option to the
> > plugin and the Kconfig.
> >
> > Signed-off-by: Kees Cook <keesc...@chromium.org>
> > ---
> > arch/Kconfig | 22 +++
> > include/linux/compiler.h | 6 +-
> > scripts/Makefile.gcc-plugins | 4 +
> > scripts/gcc-plugins/structleak_plugin.c | 246
> > ++++++++++++++++++++++++++++++++
> > 4 files changed, 277 insertions(+), 1 deletion(-)
> > create mode 100644 scripts/gcc-plugins/structleak_plugin.c
>
> I tried giving this a go, but I got the build failure below:
Looking again, I see that there was another patch to add PASS_INFO() and
other bits that the patch required. Sorry for the noise there.
In the mean time, I cribbed from the latent entropy plugin, and built
with the below applied:
----
diff --git a/scripts/gcc-plugins/structleak_plugin.c
b/scripts/gcc-plugins/structleak_plugin.c
index deddb72..1e01763 100644
--- a/scripts/gcc-plugins/structleak_plugin.c
+++ b/scripts/gcc-plugins/structleak_plugin.c
@@ -210,8 +210,12 @@ __visible int plugin_init(struct plugin_name_args
*plugin_info, struct plugin_gc
const int argc = plugin_info->argc;
const struct plugin_argument * const argv = plugin_info->argv;
bool enable = true;
-
- PASS_INFO(structleak, "early_optimizations", 1, PASS_POS_INSERT_BEFORE);
+ struct register_pass_info structleak_pass_info = {
+ .pass = make_structleak_pass(),
+ .reference_pass_name = "early_optimizations",
+ .ref_pass_instance_number = 1,
+ .pos_op = PASS_POS_INSERT_BEFORE,
+ };
if (!plugin_default_version_check(version, &gcc_version)) {
error(G_("incompatible gcc/plugin versions"));
----
With verbose mode, I see quite a few initializations, mostly in signal
handling. Something to add to the queue of things to investigate...
Mark.
