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build: Add option KERNEL_UBSAN

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The kernel Undefined Behavior Sanitizer is able to detect some memory
bugs in the kernel like out of range array accesses.

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 11:48:59 +01:00 committed by Hauke Mehrtens
parent cbb6929789
commit d9b043c03c
3 changed files with 42 additions and 0 deletions
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35
config/Config-kernel.in
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@ -85,6 +85,41 @@ config KERNEL_PROFILING
Enable the extended profiling support mechanisms used by profilers such Enable the extended profiling support mechanisms used by profilers such
as OProfile. as OProfile.
config KERNEL_UBSAN
bool "Compile the kernel with undefined behaviour sanity checker"
help
This option enables undefined behaviour sanity checker
Compile-time instrumentation is used to detect various undefined
behaviours in runtime. Various types of checks may be enabled
via boot parameter ubsan_handle
(see: Documentation/dev-tools/ubsan.rst).
config KERNEL_UBSAN_SANITIZE_ALL
bool "Enable instrumentation for the entire kernel"
depends on KERNEL_UBSAN
default y
help
This option activates instrumentation for the entire kernel.
If you don't enable this option, you have to explicitly specify
UBSAN_SANITIZE := y for the files/directories you want to check for UB.
Enabling this option will get kernel image size increased
significantly.
config KERNEL_UBSAN_ALIGNMENT
bool "Enable checking of pointers alignment"
depends on KERNEL_UBSAN
help
This option enables detection of unaligned memory accesses.
Enabling this option on architectures that support unaligned
accesses may produce a lot of false positives.
config KERNEL_UBSAN_NULL
bool "Enable checking of null pointers"
depends on KERNEL_UBSAN
help
This option enables detection of memory accesses via a
null pointer.
config KERNEL_TASKSTATS config KERNEL_TASKSTATS
bool "Compile the kernel with task resource/io statistics and accounting" bool "Compile the kernel with task resource/io statistics and accounting"
default n default n

4
target/linux/generic/config-4.14
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@ -1516,6 +1516,10 @@ CONFIG_GACT_PROB=y
# CONFIG_GAMEPORT is not set # CONFIG_GAMEPORT is not set
# CONFIG_GATEWORKS_GW16083 is not set # CONFIG_GATEWORKS_GW16083 is not set
# CONFIG_GCC_PLUGINS is not set # CONFIG_GCC_PLUGINS is not set
# CONFIG_GCC_PLUGIN_CYC_COMPLEXITY is not set
# CONFIG_GCC_PLUGIN_LATENT_ENTROPY is not set
# CONFIG_GCC_PLUGIN_RANDSTRUCT is not set
# CONFIG_GCC_PLUGIN_STRUCTLEAK is not set
# CONFIG_GCOV is not set # CONFIG_GCOV is not set
# CONFIG_GCOV_KERNEL is not set # CONFIG_GCOV_KERNEL is not set
# CONFIG_GDB_SCRIPTS is not set # CONFIG_GDB_SCRIPTS is not set

3
target/linux/generic/config-4.19
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@ -1605,6 +1605,8 @@ CONFIG_GACT_PROB=y
# CONFIG_GAMEPORT is not set # CONFIG_GAMEPORT is not set
# CONFIG_GATEWORKS_GW16083 is not set # CONFIG_GATEWORKS_GW16083 is not set
# CONFIG_GCC_PLUGINS is not set # CONFIG_GCC_PLUGINS is not set
# CONFIG_GCC_PLUGIN_CYC_COMPLEXITY is not set
# CONFIG_GCC_PLUGIN_LATENT_ENTROPY is not set
# CONFIG_GCOV is not set # CONFIG_GCOV is not set
# CONFIG_GCOV_KERNEL is not set # CONFIG_GCOV_KERNEL is not set
# CONFIG_GDB_SCRIPTS is not set # CONFIG_GDB_SCRIPTS is not set
@ -5197,6 +5199,7 @@ CONFIG_TCP_CONG_CUBIC=y
# CONFIG_TEST_STATIC_KEYS is not set # CONFIG_TEST_STATIC_KEYS is not set
# CONFIG_TEST_STRING_HELPERS is not set # CONFIG_TEST_STRING_HELPERS is not set
# CONFIG_TEST_SYSCTL is not set # CONFIG_TEST_SYSCTL is not set
# CONFIG_TEST_UBSAN is not set
# CONFIG_TEST_UDELAY is not set # CONFIG_TEST_UDELAY is not set
# CONFIG_TEST_USER_COPY is not set # CONFIG_TEST_USER_COPY is not set
# CONFIG_TEST_UUID is not set # CONFIG_TEST_UUID is not set