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https://github.com/brain-hackers/linux-brain.git
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38addce8b6
This adds a new gcc plugin named "latent_entropy". It is designed to extract as much possible uncertainty from a running system at boot time as possible, hoping to capitalize on any possible variation in CPU operation (due to runtime data differences, hardware differences, SMP ordering, thermal timing variation, cache behavior, etc). At the very least, this plugin is a much more comprehensive example for how to manipulate kernel code using the gcc plugin internals. The need for very-early boot entropy tends to be very architecture or system design specific, so this plugin is more suited for those sorts of special cases. The existing kernel RNG already attempts to extract entropy from reliable runtime variation, but this plugin takes the idea to a logical extreme by permuting a global variable based on any variation in code execution (e.g. a different value (and permutation function) is used to permute the global based on loop count, case statement, if/then/else branching, etc). To do this, the plugin starts by inserting a local variable in every marked function. The plugin then adds logic so that the value of this variable is modified by randomly chosen operations (add, xor and rol) and random values (gcc generates separate static values for each location at compile time and also injects the stack pointer at runtime). The resulting value depends on the control flow path (e.g., loops and branches taken). Before the function returns, the plugin mixes this local variable into the latent_entropy global variable. The value of this global variable is added to the kernel entropy pool in do_one_initcall() and _do_fork(), though it does not credit any bytes of entropy to the pool; the contents of the global are just used to mix the pool. Additionally, the plugin can pre-initialize arrays with build-time random contents, so that two different kernel builds running on identical hardware will not have the same starting values. Signed-off-by: Emese Revfy <re.emese@gmail.com> [kees: expanded commit message and code comments] Signed-off-by: Kees Cook <keescook@chromium.org>
68 lines
2.5 KiB
Makefile
68 lines
2.5 KiB
Makefile
ifdef CONFIG_GCC_PLUGINS
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__PLUGINCC := $(call cc-ifversion, -ge, 0408, $(HOSTCXX), $(HOSTCC))
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PLUGINCC := $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-plugin.sh "$(__PLUGINCC)" "$(HOSTCXX)" "$(CC)")
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SANCOV_PLUGIN := -fplugin=$(objtree)/scripts/gcc-plugins/sancov_plugin.so
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gcc-plugin-$(CONFIG_GCC_PLUGIN_CYC_COMPLEXITY) += cyc_complexity_plugin.so
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gcc-plugin-$(CONFIG_GCC_PLUGIN_LATENT_ENTROPY) += latent_entropy_plugin.so
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gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_LATENT_ENTROPY) += -DLATENT_ENTROPY_PLUGIN
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ifdef CONFIG_PAX_LATENT_ENTROPY
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DISABLE_LATENT_ENTROPY_PLUGIN += -fplugin-arg-latent_entropy_plugin-disable
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endif
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ifdef CONFIG_GCC_PLUGIN_SANCOV
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ifeq ($(CFLAGS_KCOV),)
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# It is needed because of the gcc-plugin.sh and gcc version checks.
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gcc-plugin-$(CONFIG_GCC_PLUGIN_SANCOV) += sancov_plugin.so
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ifneq ($(PLUGINCC),)
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CFLAGS_KCOV := $(SANCOV_PLUGIN)
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else
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$(warning warning: cannot use CONFIG_KCOV: -fsanitize-coverage=trace-pc is not supported by compiler)
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endif
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endif
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endif
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GCC_PLUGINS_CFLAGS := $(strip $(addprefix -fplugin=$(objtree)/scripts/gcc-plugins/, $(gcc-plugin-y)) $(gcc-plugin-cflags-y))
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export PLUGINCC GCC_PLUGINS_CFLAGS GCC_PLUGIN GCC_PLUGIN_SUBDIR
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export SANCOV_PLUGIN DISABLE_LATENT_ENTROPY_PLUGIN
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ifneq ($(PLUGINCC),)
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# SANCOV_PLUGIN can be only in CFLAGS_KCOV because avoid duplication.
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GCC_PLUGINS_CFLAGS := $(filter-out $(SANCOV_PLUGIN), $(GCC_PLUGINS_CFLAGS))
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endif
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KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
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GCC_PLUGIN := $(gcc-plugin-y)
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GCC_PLUGIN_SUBDIR := $(gcc-plugin-subdir-y)
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endif
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# If plugins aren't supported, abort the build before hard-to-read compiler
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# errors start getting spewed by the main build.
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PHONY += gcc-plugins-check
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gcc-plugins-check: FORCE
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ifdef CONFIG_GCC_PLUGINS
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ifeq ($(PLUGINCC),)
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ifneq ($(GCC_PLUGINS_CFLAGS),)
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ifeq ($(call cc-ifversion, -ge, 0405, y), y)
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$(Q)$(srctree)/scripts/gcc-plugin.sh --show-error "$(__PLUGINCC)" "$(HOSTCXX)" "$(CC)" || true
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@echo "Cannot use CONFIG_GCC_PLUGINS: your gcc installation does not support plugins, perhaps the necessary headers are missing?" >&2 && exit 1
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else
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@echo "Cannot use CONFIG_GCC_PLUGINS: your gcc version does not support plugins, you should upgrade it to at least gcc 4.5" >&2 && exit 1
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endif
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endif
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endif
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endif
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@:
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# Actually do the build, if requested.
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PHONY += gcc-plugins
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gcc-plugins: scripts_basic gcc-plugins-check
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ifdef CONFIG_GCC_PLUGINS
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$(Q)$(MAKE) $(build)=scripts/gcc-plugins
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endif
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@:
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