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build: Add KCOV kernel code coverage for fuzzing

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The adds an option to activate KCOV (Code coverage for fuzzing).

Signed-off-by: Hauke Mehrtens <hauke.mehrtens@intel.com>
Reviewed-by: Alexandru Ardelean <ardeleanalex@gmail.com>
This commit is contained in:
Hauke Mehrtens 2020-02-12 11:49:01 +01:00 committed by Hauke Mehrtens
parent 431594a978
commit 947d2e0a70
1 changed files with 33 additions and 0 deletions
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33
config/Config-kernel.in
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@ -172,6 +172,39 @@ config KERNEL_KASAN_INLINE
endchoice
config KERNEL_KCOV
bool "Compile the kernel with code coverage for fuzzing"
select KERNEL_DEBUG_FS
help
KCOV exposes kernel code coverage information in a form suitable
for coverage-guided fuzzing (randomized testing).
If RANDOMIZE_BASE is enabled, PC values will not be stable across
different machines and across reboots. If you need stable PC values,
disable RANDOMIZE_BASE.
For more details, see Documentation/kcov.txt.
config KERNEL_KCOV_ENABLE_COMPARISONS
bool "Enable comparison operands collection by KCOV"
depends on KERNEL_KCOV
help
KCOV also exposes operands of every comparison in the instrumented
code along with operand sizes and PCs of the comparison instructions.
These operands can be used by fuzzing engines to improve the quality
of fuzzing coverage.
config KERNEL_KCOV_INSTRUMENT_ALL
bool "Instrument all code by default"
depends on KERNEL_KCOV
default y if KERNEL_KCOV
help
If you are doing generic system call fuzzing (like e.g. syzkaller),
then you will want to instrument the whole kernel and you should
say y here. If you are doing more targeted fuzzing (like e.g.
filesystem fuzzing with AFL) then you will want to enable coverage
for more specific subsets of files, and should say n here.
config KERNEL_TASKSTATS
bool "Compile the kernel with task resource/io statistics and accounting"
default n