Stack smashing test

A test to check if -fstack-protector can be enabled and is effective.

Ref #3066

repos/base/recipes/pkg/test-stack_smash/README

@@ -0,0 +1 @@
+Scenario that immediately tries to write into previous stack frame

repos/base/recipes/pkg/test-stack_smash/archives

@@ -0,0 +1,2 @@
+_/src/init
+_/src/test-stack_smash

repos/base/recipes/pkg/test-stack_smash/hash

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+-

repos/base/recipes/pkg/test-stack_smash/runtime

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+<runtime ram="16M" caps="1000" binary="init">
+
+	<events>
+		<timeout meaning="failed" sec="20" />
+		<log meaning="succeeded">Error: stack protector check failed</log>
+	</events>
+
+	<content>
+		<rom label="ld.lib.so"/>
+		<rom label="test-stack_smash"/>
+	</content>
+
+	<config>
+		<parent-provides>
+			<service name="LOG"/>
+			<service name="CPU"/>
+			<service name="ROM"/>
+			<service name="PD"/>
+		</parent-provides>
+		<default-route>
+			<any-service> <parent/> </any-service>
+		</default-route>
+		<default caps="100"/>
+		<start name="test-stack_smash">
+			<resource name="RAM" quantum="4M"/>
+		</start>
+	</config>
+</runtime>

repos/base/recipes/src/test-stack_smash/content.mk

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+SRC_DIR = src/test/stack_smash
+include $(GENODE_DIR)/repos/base/recipes/src/content.inc

repos/base/recipes/src/test-stack_smash/hash

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+-

repos/base/recipes/src/test-stack_smash/used_apis

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+base

repos/base/src/test/stack_smash/main.cc

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+/*
+ * \brief  Simple stack smashing attempt
+ * \author Emery Hemingway
+ * \date   2018-12-05
+ */
+
+#include <base/component.h>
+#include <base/log.h>
+#include <util/string.h>
+
+
+/*
+ * FIXME
+ *
+ * There's a strange optimization implemented in GCC for x86_32 bit using
+ * __stack_chk_fail_local() which must be a local hidden symbol (and therefore
+ * part of a static library linked to the target. For more info see
+ * https://github.com/gcc-mirror/gcc/blob/master/libssp/ssp.c#L195 and
+ * https://raw.githubusercontent.com/gcc-mirror/gcc/master/gcc/config/i386/i386.c
+ * line 45261.
+ */
+extern "C" {
+	__attribute__((noreturn)) void __stack_chk_fail(void);
+
+	extern "C" __attribute__((noreturn)) __attribute__((visibility("hidden")))
+	void __stack_chk_fail_local(void)
+	{
+		__stack_chk_fail();
+	}
+}
+
+
+void Component::construct(Genode::Env &)
+{
+	using namespace Genode;
+
+	char const *msg = "................ wrote into previous frame";
+
+	char buf[16];
+	char *p = buf;
+
+	strncpy(p, msg, strlen(msg)+1);
+	log((char const *)p);
+}

repos/base/src/test/stack_smash/target.mk

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+TARGET  = test-stack_smash
+SRC_CC  = main.cc
+LIBS    = base
+CC_OPT += -fstack-protector

repos/gems/run/depot_autopilot.run

@@ -714,6 +714,7 @@ set default_test_pkgs {
 	test-signal
 	test-slab
 	test-solo5
+	test-stack_smash
 	test-stdcxx
 	test-synced_interface
 	test-tcp_bulk_lwip