mirror of
https://github.com/torvalds/linux.git
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- Kconfig and Makefile clean-ups (Masahiro Yamada, Kees Cook)
- gcc-common.h definition clean-ups (Alexander Popov) -----BEGIN PGP SIGNATURE----- Comment: Kees Cook <kees@outflux.net> iQJKBAABCgA0FiEEpcP2jyKd1g9yPm4TiXL039xtwCYFAlt0cwAWHGtlZXNjb29r QGNocm9taXVtLm9yZwAKCRCJcvTf3G3AJqOnD/4mlboKrkClTLvk6VgaCll55tQD dN7DYn03SVUqch9LTgBsRQfwZm5uYILUjZxEJxaKNTmsX2VNS5OjAqKM7lkDutEl /QcE/ikv+6+hlQY0lHiidiapPw80fFeZN6TREWu+Xjo+04RCYb8AuNWyw7mh+5RF a5juVgAHNeWc08dZUvX+ms8/xkHATPtTGmnYponJakMUqzpXdYJSPo7VmuFRp3hp TqS8KBhzOoc4Fo4/BSLbQOXU0cbNIvvifee1eAiBz7kvNafU/l0gihb/DG5hd4rs PpBEDoG7afhqJykFPbDYwwB0Ac2HiDeY2TS2yTy0ZOMbWbHITaC5IIikd5u069O5 AwNWgO4knMoBsVYz9PrCY8vY4z7zMjK16aWrjpqDQ7gsRic0tNXDeXR8T8Zd4pqT 6KlsGFyL0W5d9Zry76ucNP3AuqmstLk8Y+UqVm4H8hQ6ggTBjgHLLpze/aBk6SKn Fnb8/3qsC0kPzG5THMNvCnImXIMD5e2hVhnhFzWmF0rJXQ4MFQcRbmHSMEdzoB68 jwIzYQv7dwRi0924zRFAQ3iEorFgJuKY3M/3leIkKlcsFNVMPt+2LJLzdmPkPTng 5qd+eWxCtEfIek5rWJ6wxINwlDmItldb7zZMbZBGY4RJRPyiOpb6Qwuy+oZOSItj h4MZKscE3dfuvBRL8g== =FwNt -----END PGP SIGNATURE----- Merge tag 'gcc-plugin-cleanup-v4.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux Pull gcc plugin cleanups from Kees Cook: - Kconfig and Makefile clean-ups (Masahiro Yamada, Kees Cook) - gcc-common.h definition clean-ups (Alexander Popov) * tag 'gcc-plugin-cleanup-v4.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: gcc-plugins: Clean up the cgraph_create_edge* macros gcc-plugins: Regularize Makefile.gcc-plugins gcc-plugins: split out Kconfig entries to scripts/gcc-plugins/Kconfig gcc-plugins: remove unused GCC_PLUGIN_SUBDIR
This commit is contained in:
Linus Torvalds
commit
7c7b562c6f
146
arch/Kconfig
146
arch/Kconfig
@ -408,150 +408,6 @@ config SECCOMP_FILTER
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||||
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See Documentation/userspace-api/seccomp_filter.rst for details.
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preferred-plugin-hostcc := $(if-success,[ $(gcc-version) -ge 40800 ],$(HOSTCXX),$(HOSTCC))
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config PLUGIN_HOSTCC
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string
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default "$(shell,$(srctree)/scripts/gcc-plugin.sh "$(preferred-plugin-hostcc)" "$(HOSTCXX)" "$(CC)")"
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help
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Host compiler used to build GCC plugins. This can be $(HOSTCXX),
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$(HOSTCC), or a null string if GCC plugin is unsupported.
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config HAVE_GCC_PLUGINS
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bool
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help
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An arch should select this symbol if it supports building with
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GCC plugins.
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menuconfig GCC_PLUGINS
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bool "GCC plugins"
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depends on HAVE_GCC_PLUGINS
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depends on PLUGIN_HOSTCC != ""
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help
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GCC plugins are loadable modules that provide extra features to the
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compiler. They are useful for runtime instrumentation and static analysis.
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See Documentation/gcc-plugins.txt for details.
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||||
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config GCC_PLUGIN_CYC_COMPLEXITY
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bool "Compute the cyclomatic complexity of a function" if EXPERT
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depends on GCC_PLUGINS
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depends on !COMPILE_TEST # too noisy
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help
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The complexity M of a function's control flow graph is defined as:
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M = E - N + 2P
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where
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E = the number of edges
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N = the number of nodes
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P = the number of connected components (exit nodes).
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Enabling this plugin reports the complexity to stderr during the
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build. It mainly serves as a simple example of how to create a
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gcc plugin for the kernel.
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config GCC_PLUGIN_SANCOV
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bool
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depends on GCC_PLUGINS
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help
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This plugin inserts a __sanitizer_cov_trace_pc() call at the start of
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basic blocks. It supports all gcc versions with plugin support (from
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gcc-4.5 on). It is based on the commit "Add fuzzing coverage support"
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by Dmitry Vyukov <dvyukov@google.com>.
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config GCC_PLUGIN_LATENT_ENTROPY
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bool "Generate some entropy during boot and runtime"
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depends on GCC_PLUGINS
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help
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By saying Y here the kernel will instrument some kernel code to
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extract some entropy from both original and artificially created
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program state. This will help especially embedded systems where
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there is little 'natural' source of entropy normally. The cost
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||||
is some slowdown of the boot process (about 0.5%) and fork and
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irq processing.
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||||
|
||||
Note that entropy extracted this way is not cryptographically
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secure!
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||||
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||||
This plugin was ported from grsecurity/PaX. More information at:
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* https://grsecurity.net/
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* https://pax.grsecurity.net/
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config GCC_PLUGIN_STRUCTLEAK
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bool "Force initialization of variables containing userspace addresses"
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depends on GCC_PLUGINS
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# Currently STRUCTLEAK inserts initialization out of live scope of
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# variables from KASAN point of view. This leads to KASAN false
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# positive reports. Prohibit this combination for now.
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depends on !KASAN_EXTRA
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help
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This plugin zero-initializes any structures containing a
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__user attribute. This can prevent some classes of information
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exposures.
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This plugin was ported from grsecurity/PaX. More information at:
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* https://grsecurity.net/
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* https://pax.grsecurity.net/
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config GCC_PLUGIN_STRUCTLEAK_BYREF_ALL
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bool "Force initialize all struct type variables passed by reference"
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depends on GCC_PLUGIN_STRUCTLEAK
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depends on !COMPILE_TEST
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help
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Zero initialize any struct type local variable that may be passed by
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reference without having been initialized.
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config GCC_PLUGIN_STRUCTLEAK_VERBOSE
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bool "Report forcefully initialized variables"
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depends on GCC_PLUGIN_STRUCTLEAK
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depends on !COMPILE_TEST # too noisy
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help
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This option will cause a warning to be printed each time the
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structleak plugin finds a variable it thinks needs to be
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initialized. Since not all existing initializers are detected
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by the plugin, this can produce false positive warnings.
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config GCC_PLUGIN_RANDSTRUCT
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bool "Randomize layout of sensitive kernel structures"
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depends on GCC_PLUGINS
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select MODVERSIONS if MODULES
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help
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If you say Y here, the layouts of structures that are entirely
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function pointers (and have not been manually annotated with
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__no_randomize_layout), or structures that have been explicitly
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marked with __randomize_layout, will be randomized at compile-time.
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This can introduce the requirement of an additional information
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exposure vulnerability for exploits targeting these structure
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types.
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|
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Enabling this feature will introduce some performance impact,
|
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slightly increase memory usage, and prevent the use of forensic
|
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tools like Volatility against the system (unless the kernel
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source tree isn't cleaned after kernel installation).
|
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|
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The seed used for compilation is located at
|
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scripts/gcc-plgins/randomize_layout_seed.h. It remains after
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a make clean to allow for external modules to be compiled with
|
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the existing seed and will be removed by a make mrproper or
|
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make distclean.
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||||
|
||||
Note that the implementation requires gcc 4.7 or newer.
|
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|
||||
This plugin was ported from grsecurity/PaX. More information at:
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* https://grsecurity.net/
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* https://pax.grsecurity.net/
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config GCC_PLUGIN_RANDSTRUCT_PERFORMANCE
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bool "Use cacheline-aware structure randomization"
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depends on GCC_PLUGIN_RANDSTRUCT
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depends on !COMPILE_TEST # do not reduce test coverage
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help
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If you say Y here, the RANDSTRUCT randomization will make a
|
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best effort at restricting randomization to cacheline-sized
|
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groups of elements. It will further not randomize bitfields
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in structures. This reduces the performance hit of RANDSTRUCT
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at the cost of weakened randomization.
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config HAVE_STACKPROTECTOR
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bool
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help
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@ -975,3 +831,5 @@ config REFCOUNT_FULL
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security flaw exploits.
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source "kernel/gcov/Kconfig"
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source "scripts/gcc-plugins/Kconfig"
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@ -1,33 +1,44 @@
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# SPDX-License-Identifier: GPL-2.0
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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-$(CONFIG_GCC_PLUGIN_LATENT_ENTROPY) += -DLATENT_ENTROPY_PLUGIN
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gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_LATENT_ENTROPY) \
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+= -DLATENT_ENTROPY_PLUGIN
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ifdef CONFIG_GCC_PLUGIN_LATENT_ENTROPY
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DISABLE_LATENT_ENTROPY_PLUGIN += -fplugin-arg-latent_entropy_plugin-disable
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DISABLE_LATENT_ENTROPY_PLUGIN += -fplugin-arg-latent_entropy_plugin-disable
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endif
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gcc-plugin-$(CONFIG_GCC_PLUGIN_SANCOV) += sancov_plugin.so
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gcc-plugin-$(CONFIG_GCC_PLUGIN_STRUCTLEAK) += structleak_plugin.so
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gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE) += -fplugin-arg-structleak_plugin-verbose
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gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL) += -fplugin-arg-structleak_plugin-byref-all
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gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK) += -DSTRUCTLEAK_PLUGIN
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gcc-plugin-$(CONFIG_GCC_PLUGIN_RANDSTRUCT) += randomize_layout_plugin.so
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gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_RANDSTRUCT) += -DRANDSTRUCT_PLUGIN
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gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_RANDSTRUCT_PERFORMANCE) += -fplugin-arg-randomize_layout_plugin-performance-mode
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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 GCC_PLUGINS_CFLAGS GCC_PLUGIN GCC_PLUGIN_SUBDIR
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export DISABLE_LATENT_ENTROPY_PLUGIN
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# sancov_plugin.so can be only in CFLAGS_KCOV because avoid duplication.
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GCC_PLUGINS_CFLAGS := $(filter-out %/sancov_plugin.so, $(GCC_PLUGINS_CFLAGS))
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gcc-plugin-$(CONFIG_GCC_PLUGIN_SANCOV) += sancov_plugin.so
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gcc-plugin-$(CONFIG_GCC_PLUGIN_STRUCTLEAK) += structleak_plugin.so
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gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE) \
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+= -fplugin-arg-structleak_plugin-verbose
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gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL) \
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+= -fplugin-arg-structleak_plugin-byref-all
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gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK) \
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+= -DSTRUCTLEAK_PLUGIN
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gcc-plugin-$(CONFIG_GCC_PLUGIN_RANDSTRUCT) += randomize_layout_plugin.so
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gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_RANDSTRUCT) \
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+= -DRANDSTRUCT_PLUGIN
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gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_RANDSTRUCT_PERFORMANCE) \
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+= -fplugin-arg-randomize_layout_plugin-performance-mode
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# All the plugin CFLAGS are collected here in case a build target needs to
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# filter them out of the KBUILD_CFLAGS.
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GCC_PLUGINS_CFLAGS := $(strip $(addprefix -fplugin=$(objtree)/scripts/gcc-plugins/, $(gcc-plugin-y)) $(gcc-plugin-cflags-y))
|
||||
# The sancov_plugin.so is included via CFLAGS_KCOV, so it is removed here.
|
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GCC_PLUGINS_CFLAGS := $(filter-out %/sancov_plugin.so, $(GCC_PLUGINS_CFLAGS))
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export GCC_PLUGINS_CFLAGS
|
||||
|
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# Add the flags to the build!
|
||||
KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
|
||||
|
||||
# All enabled GCC plugins are collected here for building below.
|
||||
GCC_PLUGIN := $(gcc-plugin-y)
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GCC_PLUGIN_SUBDIR := $(gcc-plugin-subdir-y)
|
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export GCC_PLUGIN
|
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|
||||
# Actually do the build, if requested.
|
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PHONY += gcc-plugins
|
||||
|
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142
scripts/gcc-plugins/Kconfig
Normal file
142
scripts/gcc-plugins/Kconfig
Normal file
@ -0,0 +1,142 @@
|
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preferred-plugin-hostcc := $(if-success,[ $(gcc-version) -ge 40800 ],$(HOSTCXX),$(HOSTCC))
|
||||
|
||||
config PLUGIN_HOSTCC
|
||||
string
|
||||
default "$(shell,$(srctree)/scripts/gcc-plugin.sh "$(preferred-plugin-hostcc)" "$(HOSTCXX)" "$(CC)")"
|
||||
help
|
||||
Host compiler used to build GCC plugins. This can be $(HOSTCXX),
|
||||
$(HOSTCC), or a null string if GCC plugin is unsupported.
|
||||
|
||||
config HAVE_GCC_PLUGINS
|
||||
bool
|
||||
help
|
||||
An arch should select this symbol if it supports building with
|
||||
GCC plugins.
|
||||
|
||||
menuconfig GCC_PLUGINS
|
||||
bool "GCC plugins"
|
||||
depends on HAVE_GCC_PLUGINS
|
||||
depends on PLUGIN_HOSTCC != ""
|
||||
help
|
||||
GCC plugins are loadable modules that provide extra features to the
|
||||
compiler. They are useful for runtime instrumentation and static analysis.
|
||||
|
||||
See Documentation/gcc-plugins.txt for details.
|
||||
|
||||
if GCC_PLUGINS
|
||||
|
||||
config GCC_PLUGIN_CYC_COMPLEXITY
|
||||
bool "Compute the cyclomatic complexity of a function" if EXPERT
|
||||
depends on !COMPILE_TEST # too noisy
|
||||
help
|
||||
The complexity M of a function's control flow graph is defined as:
|
||||
M = E - N + 2P
|
||||
where
|
||||
|
||||
E = the number of edges
|
||||
N = the number of nodes
|
||||
P = the number of connected components (exit nodes).
|
||||
|
||||
Enabling this plugin reports the complexity to stderr during the
|
||||
build. It mainly serves as a simple example of how to create a
|
||||
gcc plugin for the kernel.
|
||||
|
||||
config GCC_PLUGIN_SANCOV
|
||||
bool
|
||||
help
|
||||
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@google.com>.
|
||||
|
||||
config GCC_PLUGIN_LATENT_ENTROPY
|
||||
bool "Generate some entropy during boot and runtime"
|
||||
help
|
||||
By saying Y here the kernel will instrument some kernel code to
|
||||
extract some entropy from both original and artificially created
|
||||
program state. This will help especially embedded systems where
|
||||
there is little 'natural' source of entropy normally. The cost
|
||||
is some slowdown of the boot process (about 0.5%) and fork and
|
||||
irq processing.
|
||||
|
||||
Note that entropy extracted this way is not cryptographically
|
||||
secure!
|
||||
|
||||
This plugin was ported from grsecurity/PaX. More information at:
|
||||
* https://grsecurity.net/
|
||||
* https://pax.grsecurity.net/
|
||||
|
||||
config GCC_PLUGIN_STRUCTLEAK
|
||||
bool "Force initialization of variables containing userspace addresses"
|
||||
# Currently STRUCTLEAK inserts initialization out of live scope of
|
||||
# variables from KASAN point of view. This leads to KASAN false
|
||||
# positive reports. Prohibit this combination for now.
|
||||
depends on !KASAN_EXTRA
|
||||
help
|
||||
This plugin zero-initializes any structures containing a
|
||||
__user attribute. This can prevent some classes of information
|
||||
exposures.
|
||||
|
||||
This plugin was ported from grsecurity/PaX. More information at:
|
||||
* https://grsecurity.net/
|
||||
* https://pax.grsecurity.net/
|
||||
|
||||
config GCC_PLUGIN_STRUCTLEAK_BYREF_ALL
|
||||
bool "Force initialize all struct type variables passed by reference"
|
||||
depends on GCC_PLUGIN_STRUCTLEAK
|
||||
depends on !COMPILE_TEST
|
||||
help
|
||||
Zero initialize any struct type local variable that may be passed by
|
||||
reference without having been initialized.
|
||||
|
||||
config GCC_PLUGIN_STRUCTLEAK_VERBOSE
|
||||
bool "Report forcefully initialized variables"
|
||||
depends on GCC_PLUGIN_STRUCTLEAK
|
||||
depends on !COMPILE_TEST # too noisy
|
||||
help
|
||||
This option will cause a warning to be printed each time the
|
||||
structleak plugin finds a variable it thinks needs to be
|
||||
initialized. Since not all existing initializers are detected
|
||||
by the plugin, this can produce false positive warnings.
|
||||
|
||||
config GCC_PLUGIN_RANDSTRUCT
|
||||
bool "Randomize layout of sensitive kernel structures"
|
||||
select MODVERSIONS if MODULES
|
||||
help
|
||||
If you say Y here, the layouts of structures that are entirely
|
||||
function pointers (and have not been manually annotated with
|
||||
__no_randomize_layout), or structures that have been explicitly
|
||||
marked with __randomize_layout, will be randomized at compile-time.
|
||||
This can introduce the requirement of an additional information
|
||||
exposure vulnerability for exploits targeting these structure
|
||||
types.
|
||||
|
||||
Enabling this feature will introduce some performance impact,
|
||||
slightly increase memory usage, and prevent the use of forensic
|
||||
tools like Volatility against the system (unless the kernel
|
||||
source tree isn't cleaned after kernel installation).
|
||||
|
||||
The seed used for compilation is located at
|
||||
scripts/gcc-plgins/randomize_layout_seed.h. It remains after
|
||||
a make clean to allow for external modules to be compiled with
|
||||
the existing seed and will be removed by a make mrproper or
|
||||
make distclean.
|
||||
|
||||
Note that the implementation requires gcc 4.7 or newer.
|
||||
|
||||
This plugin was ported from grsecurity/PaX. More information at:
|
||||
* https://grsecurity.net/
|
||||
* https://pax.grsecurity.net/
|
||||
|
||||
config GCC_PLUGIN_RANDSTRUCT_PERFORMANCE
|
||||
bool "Use cacheline-aware structure randomization"
|
||||
depends on GCC_PLUGIN_RANDSTRUCT
|
||||
depends on !COMPILE_TEST # do not reduce test coverage
|
||||
help
|
||||
If you say Y here, the RANDSTRUCT randomization will make a
|
||||
best effort at restricting randomization to cacheline-sized
|
||||
groups of elements. It will further not randomize bitfields
|
||||
in structures. This reduces the performance hit of RANDSTRUCT
|
||||
at the cost of weakened randomization.
|
||||
|
||||
endif
|
||||
@ -14,8 +14,6 @@ else
|
||||
export HOST_EXTRACXXFLAGS
|
||||
endif
|
||||
|
||||
export HOSTLIBS
|
||||
|
||||
$(obj)/randomize_layout_plugin.o: $(objtree)/$(obj)/randomize_layout_seed.h
|
||||
quiet_cmd_create_randomize_layout_seed = GENSEED $@
|
||||
cmd_create_randomize_layout_seed = \
|
||||
@ -29,7 +27,4 @@ always := $($(HOSTLIBS)-y)
|
||||
|
||||
$(foreach p,$($(HOSTLIBS)-y:%.so=%),$(eval $(p)-objs := $(p).o))
|
||||
|
||||
subdir-y := $(GCC_PLUGIN_SUBDIR)
|
||||
subdir- += $(GCC_PLUGIN_SUBDIR)
|
||||
|
||||
clean-files += *.so
|
||||
|
||||
@ -392,13 +392,6 @@ static inline struct cgraph_node *cgraph_alias_target(struct cgraph_node *n)
|
||||
}
|
||||
#endif
|
||||
|
||||
#if BUILDING_GCC_VERSION >= 4007 && BUILDING_GCC_VERSION <= 4009
|
||||
#define cgraph_create_edge(caller, callee, call_stmt, count, freq, nest) \
|
||||
cgraph_create_edge((caller), (callee), (call_stmt), (count), (freq))
|
||||
#define cgraph_create_edge_including_clones(caller, callee, old_call_stmt, call_stmt, count, freq, nest, reason) \
|
||||
cgraph_create_edge_including_clones((caller), (callee), (old_call_stmt), (call_stmt), (count), (freq), (reason))
|
||||
#endif
|
||||
|
||||
#if BUILDING_GCC_VERSION <= 4008
|
||||
#define ENTRY_BLOCK_PTR_FOR_FN(FN) ENTRY_BLOCK_PTR_FOR_FUNCTION(FN)
|
||||
#define EXIT_BLOCK_PTR_FOR_FN(FN) EXIT_BLOCK_PTR_FOR_FUNCTION(FN)
|
||||
@ -723,10 +716,23 @@ static inline const char *get_decl_section_name(const_tree decl)
|
||||
#define varpool_get_node(decl) varpool_node::get(decl)
|
||||
#define dump_varpool_node(file, node) (node)->dump(file)
|
||||
|
||||
#define cgraph_create_edge(caller, callee, call_stmt, count, freq, nest) \
|
||||
#if BUILDING_GCC_VERSION >= 8000
|
||||
#define cgraph_create_edge(caller, callee, call_stmt, count, freq) \
|
||||
(caller)->create_edge((callee), (call_stmt), (count))
|
||||
|
||||
#define cgraph_create_edge_including_clones(caller, callee, \
|
||||
old_call_stmt, call_stmt, count, freq, reason) \
|
||||
(caller)->create_edge_including_clones((callee), \
|
||||
(old_call_stmt), (call_stmt), (count), (reason))
|
||||
#else
|
||||
#define cgraph_create_edge(caller, callee, call_stmt, count, freq) \
|
||||
(caller)->create_edge((callee), (call_stmt), (count), (freq))
|
||||
#define cgraph_create_edge_including_clones(caller, callee, old_call_stmt, call_stmt, count, freq, nest, reason) \
|
||||
(caller)->create_edge_including_clones((callee), (old_call_stmt), (call_stmt), (count), (freq), (reason))
|
||||
|
||||
#define cgraph_create_edge_including_clones(caller, callee, \
|
||||
old_call_stmt, call_stmt, count, freq, reason) \
|
||||
(caller)->create_edge_including_clones((callee), \
|
||||
(old_call_stmt), (call_stmt), (count), (freq), (reason))
|
||||
#endif
|
||||
|
||||
typedef struct cgraph_node *cgraph_node_ptr;
|
||||
typedef struct cgraph_edge *cgraph_edge_p;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user