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_SANCOV 22 config GCC_PLUGIN_SANCOV
23 bool 23 bool
24 # Plugin can be removed once the kerne 24 # Plugin can be removed once the kernel only supports GCC 6+
25 depends on !CC_HAS_SANCOV_TRACE_PC 25 depends on !CC_HAS_SANCOV_TRACE_PC
26 help 26 help
27 This plugin inserts a __sanitizer_co 27 This plugin inserts a __sanitizer_cov_trace_pc() call at the start of
28 basic blocks. It supports all gcc ve 28 basic blocks. It supports all gcc versions with plugin support (from
29 gcc-4.5 on). It is based on the comm 29 gcc-4.5 on). It is based on the commit "Add fuzzing coverage support"
30 by Dmitry Vyukov <dvyukov@google.com> 30 by Dmitry Vyukov <dvyukov@google.com>.
31 31
32 config GCC_PLUGIN_LATENT_ENTROPY 32 config GCC_PLUGIN_LATENT_ENTROPY
33 bool "Generate some entropy during boo 33 bool "Generate some entropy during boot and runtime"
34 help 34 help
35 By saying Y here the kernel will ins 35 By saying Y here the kernel will instrument some kernel code to
36 extract some entropy from both origi 36 extract some entropy from both original and artificially created
37 program state. This will help espec 37 program state. This will help especially embedded systems where
38 there is little 'natural' source of 38 there is little 'natural' source of entropy normally. The cost
39 is some slowdown of the boot process 39 is some slowdown of the boot process (about 0.5%) and fork and
40 irq processing. 40 irq processing.
41 41
42 Note that entropy extracted this way 42 Note that entropy extracted this way is not cryptographically
43 secure! 43 secure!
44 44
45 This plugin was ported from grsecuri 45 This plugin was ported from grsecurity/PaX. More information at:
46 * https://grsecurity.net/ 46 * https://grsecurity.net/
47 * https://pax.grsecurity.net/ 47 * https://pax.grsecurity.net/
48 48
>> 49 config GCC_PLUGIN_RANDSTRUCT
>> 50 bool "Randomize layout of sensitive kernel structures"
>> 51 select MODVERSIONS if MODULES
>> 52 help
>> 53 If you say Y here, the layouts of structures that are entirely
>> 54 function pointers (and have not been manually annotated with
>> 55 __no_randomize_layout), or structures that have been explicitly
>> 56 marked with __randomize_layout, will be randomized at compile-time.
>> 57 This can introduce the requirement of an additional information
>> 58 exposure vulnerability for exploits targeting these structure
>> 59 types.
>> 60
>> 61 Enabling this feature will introduce some performance impact,
>> 62 slightly increase memory usage, and prevent the use of forensic
>> 63 tools like Volatility against the system (unless the kernel
>> 64 source tree isn't cleaned after kernel installation).
>> 65
>> 66 The seed used for compilation is located at
>> 67 scripts/gcc-plugins/randomize_layout_seed.h. It remains after
>> 68 a make clean to allow for external modules to be compiled with
>> 69 the existing seed and will be removed by a make mrproper or
>> 70 make distclean.
>> 71
>> 72 This plugin was ported from grsecurity/PaX. More information at:
>> 73 * https://grsecurity.net/
>> 74 * https://pax.grsecurity.net/
>> 75
>> 76 config GCC_PLUGIN_RANDSTRUCT_PERFORMANCE
>> 77 bool "Use cacheline-aware structure randomization"
>> 78 depends on GCC_PLUGIN_RANDSTRUCT
>> 79 depends on !COMPILE_TEST # do not reduce test coverage
>> 80 help
>> 81 If you say Y here, the RANDSTRUCT randomization will make a
>> 82 best effort at restricting randomization to cacheline-sized
>> 83 groups of elements. It will further not randomize bitfields
>> 84 in structures. This reduces the performance hit of RANDSTRUCT
>> 85 at the cost of weakened randomization.
>> 86
49 config GCC_PLUGIN_ARM_SSP_PER_TASK 87 config GCC_PLUGIN_ARM_SSP_PER_TASK
50 bool 88 bool
51 depends on GCC_PLUGINS && ARM 89 depends on GCC_PLUGINS && ARM
52 90
53 endif 91 endif
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