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Linux/scripts/gcc-plugins/Kconfig

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Diff markup

Differences between /scripts/gcc-plugins/Kconfig (Version linux-6.11.5) and /scripts/gcc-plugins/Kconfig (Version linux-5.12.19)


  1 # SPDX-License-Identifier: GPL-2.0-only             1 # SPDX-License-Identifier: GPL-2.0-only
  2 config HAVE_GCC_PLUGINS                             2 config HAVE_GCC_PLUGINS
  3         bool                                        3         bool
  4         help                                        4         help
  5           An arch should select this symbol if      5           An arch should select this symbol if it supports building with
  6           GCC plugins.                              6           GCC plugins.
  7                                                     7 
  8 menuconfig GCC_PLUGINS                              8 menuconfig GCC_PLUGINS
  9         bool "GCC plugins"                          9         bool "GCC plugins"
 10         depends on HAVE_GCC_PLUGINS                10         depends on HAVE_GCC_PLUGINS
 11         depends on CC_IS_GCC                       11         depends on CC_IS_GCC
 12         depends on $(success,test -e $(shell,$     12         depends on $(success,test -e $(shell,$(CC) -print-file-name=plugin)/include/plugin-version.h)
 13         default y                                  13         default y
 14         help                                       14         help
 15           GCC plugins are loadable modules tha     15           GCC plugins are loadable modules that provide extra features to the
 16           compiler. They are useful for runtim     16           compiler. They are useful for runtime instrumentation and static analysis.
 17                                                    17 
 18           See Documentation/kbuild/gcc-plugins     18           See Documentation/kbuild/gcc-plugins.rst for details.
 19                                                    19 
 20 if GCC_PLUGINS                                     20 if GCC_PLUGINS
 21                                                    21 
                                                   >>  22 config GCC_PLUGIN_CYC_COMPLEXITY
                                                   >>  23         bool "Compute the cyclomatic complexity of a function" if EXPERT
                                                   >>  24         depends on !COMPILE_TEST        # too noisy
                                                   >>  25         help
                                                   >>  26           The complexity M of a function's control flow graph is defined as:
                                                   >>  27            M = E - N + 2P
                                                   >>  28           where
                                                   >>  29 
                                                   >>  30           E = the number of edges
                                                   >>  31           N = the number of nodes
                                                   >>  32           P = the number of connected components (exit nodes).
                                                   >>  33 
                                                   >>  34           Enabling this plugin reports the complexity to stderr during the
                                                   >>  35           build. It mainly serves as a simple example of how to create a
                                                   >>  36           gcc plugin for the kernel.
                                                   >>  37 
 22 config GCC_PLUGIN_SANCOV                           38 config GCC_PLUGIN_SANCOV
 23         bool                                       39         bool
 24         # Plugin can be removed once the kerne << 
 25         depends on !CC_HAS_SANCOV_TRACE_PC     << 
 26         help                                       40         help
 27           This plugin inserts a __sanitizer_co     41           This plugin inserts a __sanitizer_cov_trace_pc() call at the start of
 28           basic blocks. It supports all gcc ve     42           basic blocks. It supports all gcc versions with plugin support (from
 29           gcc-4.5 on). It is based on the comm     43           gcc-4.5 on). It is based on the commit "Add fuzzing coverage support"
 30           by Dmitry Vyukov <dvyukov@google.com>     44           by Dmitry Vyukov <dvyukov@google.com>.
 31                                                    45 
 32 config GCC_PLUGIN_LATENT_ENTROPY                   46 config GCC_PLUGIN_LATENT_ENTROPY
 33         bool "Generate some entropy during boo     47         bool "Generate some entropy during boot and runtime"
 34         help                                       48         help
 35           By saying Y here the kernel will ins     49           By saying Y here the kernel will instrument some kernel code to
 36           extract some entropy from both origi     50           extract some entropy from both original and artificially created
 37           program state.  This will help espec     51           program state.  This will help especially embedded systems where
 38           there is little 'natural' source of      52           there is little 'natural' source of entropy normally.  The cost
 39           is some slowdown of the boot process     53           is some slowdown of the boot process (about 0.5%) and fork and
 40           irq processing.                          54           irq processing.
 41                                                    55 
 42           Note that entropy extracted this way     56           Note that entropy extracted this way is not cryptographically
 43           secure!                                  57           secure!
 44                                                    58 
 45           This plugin was ported from grsecuri     59           This plugin was ported from grsecurity/PaX. More information at:
 46            * https://grsecurity.net/               60            * https://grsecurity.net/
 47            * https://pax.grsecurity.net/           61            * https://pax.grsecurity.net/
                                                   >>  62 
                                                   >>  63 config GCC_PLUGIN_RANDSTRUCT
                                                   >>  64         bool "Randomize layout of sensitive kernel structures"
                                                   >>  65         select MODVERSIONS if MODULES
                                                   >>  66         help
                                                   >>  67           If you say Y here, the layouts of structures that are entirely
                                                   >>  68           function pointers (and have not been manually annotated with
                                                   >>  69           __no_randomize_layout), or structures that have been explicitly
                                                   >>  70           marked with __randomize_layout, will be randomized at compile-time.
                                                   >>  71           This can introduce the requirement of an additional information
                                                   >>  72           exposure vulnerability for exploits targeting these structure
                                                   >>  73           types.
                                                   >>  74 
                                                   >>  75           Enabling this feature will introduce some performance impact,
                                                   >>  76           slightly increase memory usage, and prevent the use of forensic
                                                   >>  77           tools like Volatility against the system (unless the kernel
                                                   >>  78           source tree isn't cleaned after kernel installation).
                                                   >>  79 
                                                   >>  80           The seed used for compilation is located at
                                                   >>  81           scripts/gcc-plugins/randomize_layout_seed.h.  It remains after
                                                   >>  82           a make clean to allow for external modules to be compiled with
                                                   >>  83           the existing seed and will be removed by a make mrproper or
                                                   >>  84           make distclean.
                                                   >>  85 
                                                   >>  86           Note that the implementation requires gcc 4.7 or newer.
                                                   >>  87 
                                                   >>  88           This plugin was ported from grsecurity/PaX. More information at:
                                                   >>  89            * https://grsecurity.net/
                                                   >>  90            * https://pax.grsecurity.net/
                                                   >>  91 
                                                   >>  92 config GCC_PLUGIN_RANDSTRUCT_PERFORMANCE
                                                   >>  93         bool "Use cacheline-aware structure randomization"
                                                   >>  94         depends on GCC_PLUGIN_RANDSTRUCT
                                                   >>  95         depends on !COMPILE_TEST        # do not reduce test coverage
                                                   >>  96         help
                                                   >>  97           If you say Y here, the RANDSTRUCT randomization will make a
                                                   >>  98           best effort at restricting randomization to cacheline-sized
                                                   >>  99           groups of elements.  It will further not randomize bitfields
                                                   >> 100           in structures.  This reduces the performance hit of RANDSTRUCT
                                                   >> 101           at the cost of weakened randomization.
 48                                                   102 
 49 config GCC_PLUGIN_ARM_SSP_PER_TASK                103 config GCC_PLUGIN_ARM_SSP_PER_TASK
 50         bool                                      104         bool
 51         depends on GCC_PLUGINS && ARM             105         depends on GCC_PLUGINS && ARM
 52                                                   106 
 53 endif                                             107 endif
                                                      

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