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Subject[RESEND PATCH v3 4/9] hacking: Move kernel testing and coverage options to same submenu
Date
Move error injection, coverage, testing, kunit options to a new submenu
'Kernel Testing and Coverage'. They are all for test purpose.

Signed-off-by: Changbin Du <changbin.du@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
---
lib/Kconfig.debug | 499 +++++++++++++++++++++++-----------------------
1 file changed, 252 insertions(+), 247 deletions(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index f1de5e79573b..9911e5c6eafa 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -766,53 +766,6 @@ source "lib/Kconfig.kasan"

endmenu # "Memory Debugging"

-config ARCH_HAS_KCOV
- bool
- help
- An architecture should select this when it can successfully
- build and run with CONFIG_KCOV. This typically requires
- disabling instrumentation for some early boot code.
-
-config CC_HAS_SANCOV_TRACE_PC
- def_bool $(cc-option,-fsanitize-coverage=trace-pc)
-
-config KCOV
- bool "Code coverage for fuzzing"
- depends on ARCH_HAS_KCOV
- depends on CC_HAS_SANCOV_TRACE_PC || GCC_PLUGINS
- select DEBUG_FS
- select GCC_PLUGIN_SANCOV if !CC_HAS_SANCOV_TRACE_PC
- 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/dev-tools/kcov.rst.
-
-config KCOV_ENABLE_COMPARISONS
- bool "Enable comparison operands collection by KCOV"
- depends on KCOV
- depends on $(cc-option,-fsanitize-coverage=trace-cmp)
- 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 KCOV_INSTRUMENT_ALL
- bool "Instrument all code by default"
- depends on KCOV
- default y
- 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 DEBUG_SHIRQ
bool "Debug shared IRQ handlers"
depends on DEBUG_KERNEL
@@ -1482,164 +1435,6 @@ config CPU_HOTPLUG_STATE_CONTROL

Say N if your are unsure.

-config NOTIFIER_ERROR_INJECTION
- tristate "Notifier error injection"
- depends on DEBUG_KERNEL
- select DEBUG_FS
- help
- This option provides the ability to inject artificial errors to
- specified notifier chain callbacks. It is useful to test the error
- handling of notifier call chain failures.
-
- Say N if unsure.
-
-config PM_NOTIFIER_ERROR_INJECT
- tristate "PM notifier error injection module"
- depends on PM && NOTIFIER_ERROR_INJECTION
- default m if PM_DEBUG
- help
- This option provides the ability to inject artificial errors to
- PM notifier chain callbacks. It is controlled through debugfs
- interface /sys/kernel/debug/notifier-error-inject/pm
-
- If the notifier call chain should be failed with some events
- notified, write the error code to "actions/<notifier event>/error".
-
- Example: Inject PM suspend error (-12 = -ENOMEM)
-
- # cd /sys/kernel/debug/notifier-error-inject/pm/
- # echo -12 > actions/PM_SUSPEND_PREPARE/error
- # echo mem > /sys/power/state
- bash: echo: write error: Cannot allocate memory
-
- To compile this code as a module, choose M here: the module will
- be called pm-notifier-error-inject.
-
- If unsure, say N.
-
-config OF_RECONFIG_NOTIFIER_ERROR_INJECT
- tristate "OF reconfig notifier error injection module"
- depends on OF_DYNAMIC && NOTIFIER_ERROR_INJECTION
- help
- This option provides the ability to inject artificial errors to
- OF reconfig notifier chain callbacks. It is controlled
- through debugfs interface under
- /sys/kernel/debug/notifier-error-inject/OF-reconfig/
-
- If the notifier call chain should be failed with some events
- notified, write the error code to "actions/<notifier event>/error".
-
- To compile this code as a module, choose M here: the module will
- be called of-reconfig-notifier-error-inject.
-
- If unsure, say N.
-
-config NETDEV_NOTIFIER_ERROR_INJECT
- tristate "Netdev notifier error injection module"
- depends on NET && NOTIFIER_ERROR_INJECTION
- help
- This option provides the ability to inject artificial errors to
- netdevice notifier chain callbacks. It is controlled through debugfs
- interface /sys/kernel/debug/notifier-error-inject/netdev
-
- If the notifier call chain should be failed with some events
- notified, write the error code to "actions/<notifier event>/error".
-
- Example: Inject netdevice mtu change error (-22 = -EINVAL)
-
- # cd /sys/kernel/debug/notifier-error-inject/netdev
- # echo -22 > actions/NETDEV_CHANGEMTU/error
- # ip link set eth0 mtu 1024
- RTNETLINK answers: Invalid argument
-
- To compile this code as a module, choose M here: the module will
- be called netdev-notifier-error-inject.
-
- If unsure, say N.
-
-config FUNCTION_ERROR_INJECTION
- def_bool y
- depends on HAVE_FUNCTION_ERROR_INJECTION && KPROBES
-
-config FAULT_INJECTION
- bool "Fault-injection framework"
- depends on DEBUG_KERNEL
- help
- Provide fault-injection framework.
- For more details, see Documentation/fault-injection/.
-
-config FAILSLAB
- bool "Fault-injection capability for kmalloc"
- depends on FAULT_INJECTION
- depends on SLAB || SLUB
- help
- Provide fault-injection capability for kmalloc.
-
-config FAIL_PAGE_ALLOC
- bool "Fault-injection capabilitiy for alloc_pages()"
- depends on FAULT_INJECTION
- help
- Provide fault-injection capability for alloc_pages().
-
-config FAIL_MAKE_REQUEST
- bool "Fault-injection capability for disk IO"
- depends on FAULT_INJECTION && BLOCK
- help
- Provide fault-injection capability for disk IO.
-
-config FAIL_IO_TIMEOUT
- bool "Fault-injection capability for faking disk interrupts"
- depends on FAULT_INJECTION && BLOCK
- help
- Provide fault-injection capability on end IO handling. This
- will make the block layer "forget" an interrupt as configured,
- thus exercising the error handling.
-
- Only works with drivers that use the generic timeout handling,
- for others it wont do anything.
-
-config FAIL_FUTEX
- bool "Fault-injection capability for futexes"
- select DEBUG_FS
- depends on FAULT_INJECTION && FUTEX
- help
- Provide fault-injection capability for futexes.
-
-config FAULT_INJECTION_DEBUG_FS
- bool "Debugfs entries for fault-injection capabilities"
- depends on FAULT_INJECTION && SYSFS && DEBUG_FS
- help
- Enable configuration of fault-injection capabilities via debugfs.
-
-config FAIL_FUNCTION
- bool "Fault-injection capability for functions"
- depends on FAULT_INJECTION_DEBUG_FS && FUNCTION_ERROR_INJECTION
- help
- Provide function-based fault-injection capability.
- This will allow you to override a specific function with a return
- with given return value. As a result, function caller will see
- an error value and have to handle it. This is useful to test the
- error handling in various subsystems.
-
-config FAIL_MMC_REQUEST
- bool "Fault-injection capability for MMC IO"
- depends on FAULT_INJECTION_DEBUG_FS && MMC
- help
- Provide fault-injection capability for MMC IO.
- This will make the mmc core return data errors. This is
- useful to test the error handling in the mmc block device
- and to test how the mmc host driver handles retries from
- the block device.
-
-config FAULT_INJECTION_STACKTRACE_FILTER
- bool "stacktrace filter for fault-injection capabilities"
- depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT
- depends on !X86_64
- select STACKTRACE
- select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM && !ARC && !X86
- help
- Provide stacktrace filter for fault-injection capabilities
-
config LATENCYTOP
bool "Latency measuring infrastructure"
depends on DEBUG_KERNEL
@@ -1686,7 +1481,108 @@ config PROVIDE_OHCI1394_DMA_INIT

See Documentation/debugging-via-ohci1394.txt for more information.

-source "lib/kunit/Kconfig"
+source "samples/Kconfig"
+
+config ARCH_HAS_DEVMEM_IS_ALLOWED
+ bool
+
+config STRICT_DEVMEM
+ bool "Filter access to /dev/mem"
+ depends on MMU && DEVMEM
+ depends on ARCH_HAS_DEVMEM_IS_ALLOWED
+ default y if PPC || X86 || ARM64
+ ---help---
+ If this option is disabled, you allow userspace (root) access to all
+ of memory, including kernel and userspace memory. Accidental
+ access to this is obviously disastrous, but specific access can
+ be used by people debugging the kernel. Note that with PAT support
+ enabled, even in this case there are restrictions on /dev/mem
+ use due to the cache aliasing requirements.
+
+ If this option is switched on, and IO_STRICT_DEVMEM=n, the /dev/mem
+ file only allows userspace access to PCI space and the BIOS code and
+ data regions. This is sufficient for dosemu and X and all common
+ users of /dev/mem.
+
+ If in doubt, say Y.
+
+config IO_STRICT_DEVMEM
+ bool "Filter I/O access to /dev/mem"
+ depends on STRICT_DEVMEM
+ ---help---
+ If this option is disabled, you allow userspace (root) access to all
+ io-memory regardless of whether a driver is actively using that
+ range. Accidental access to this is obviously disastrous, but
+ specific access can be used by people debugging kernel drivers.
+
+ If this option is switched on, the /dev/mem file only allows
+ userspace access to *idle* io-memory ranges (see /proc/iomem) This
+ may break traditional users of /dev/mem (dosemu, legacy X, etc...)
+ if the driver using a given range cannot be disabled.
+
+ If in doubt, say Y.
+
+config DEBUG_AID_FOR_SYZBOT
+ bool "Additional debug code for syzbot"
+ default n
+ help
+ This option is intended for testing by syzbot.
+
+menu "$(SRCARCH) Debugging"
+
+source "arch/$(SRCARCH)/Kconfig.debug"
+
+endmenu
+
+menu "Kernel Testing and Coverage"
+
+config ARCH_HAS_KCOV
+ bool
+ help
+ An architecture should select this when it can successfully
+ build and run with CONFIG_KCOV. This typically requires
+ disabling instrumentation for some early boot code.
+
+config CC_HAS_SANCOV_TRACE_PC
+ def_bool $(cc-option,-fsanitize-coverage=trace-pc)
+
+
+config KCOV
+ bool "Code coverage for fuzzing"
+ depends on ARCH_HAS_KCOV
+ depends on CC_HAS_SANCOV_TRACE_PC || GCC_PLUGINS
+ select DEBUG_FS
+ select GCC_PLUGIN_SANCOV if !CC_HAS_SANCOV_TRACE_PC
+ 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/dev-tools/kcov.rst.
+
+config KCOV_ENABLE_COMPARISONS
+ bool "Enable comparison operands collection by KCOV"
+ depends on KCOV
+ depends on $(cc-option,-fsanitize-coverage=trace-cmp)
+ 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 KCOV_INSTRUMENT_ALL
+ bool "Instrument all code by default"
+ depends on KCOV
+ default y
+ 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.

menuconfig RUNTIME_TESTING_MENU
bool "Runtime Testing"
@@ -2105,57 +2001,166 @@ config MEMTEST
memtest=17, mean do 17 test patterns.
If you are unsure how to answer this question, answer N.

-source "samples/Kconfig"
+config NOTIFIER_ERROR_INJECTION
+ tristate "Notifier error injection"
+ depends on DEBUG_KERNEL
+ select DEBUG_FS
+ help
+ This option provides the ability to inject artificial errors to
+ specified notifier chain callbacks. It is useful to test the error
+ handling of notifier call chain failures.

-config ARCH_HAS_DEVMEM_IS_ALLOWED
- bool
+ Say N if unsure.

-config STRICT_DEVMEM
- bool "Filter access to /dev/mem"
- depends on MMU && DEVMEM
- depends on ARCH_HAS_DEVMEM_IS_ALLOWED
- default y if PPC || X86 || ARM64
- ---help---
- If this option is disabled, you allow userspace (root) access to all
- of memory, including kernel and userspace memory. Accidental
- access to this is obviously disastrous, but specific access can
- be used by people debugging the kernel. Note that with PAT support
- enabled, even in this case there are restrictions on /dev/mem
- use due to the cache aliasing requirements.
+config PM_NOTIFIER_ERROR_INJECT
+ tristate "PM notifier error injection module"
+ depends on PM && NOTIFIER_ERROR_INJECTION
+ default m if PM_DEBUG
+ help
+ This option provides the ability to inject artificial errors to
+ PM notifier chain callbacks. It is controlled through debugfs
+ interface /sys/kernel/debug/notifier-error-inject/pm

- If this option is switched on, and IO_STRICT_DEVMEM=n, the /dev/mem
- file only allows userspace access to PCI space and the BIOS code and
- data regions. This is sufficient for dosemu and X and all common
- users of /dev/mem.
+ If the notifier call chain should be failed with some events
+ notified, write the error code to "actions/<notifier event>/error".

- If in doubt, say Y.
+ Example: Inject PM suspend error (-12 = -ENOMEM)

-config IO_STRICT_DEVMEM
- bool "Filter I/O access to /dev/mem"
- depends on STRICT_DEVMEM
- ---help---
- If this option is disabled, you allow userspace (root) access to all
- io-memory regardless of whether a driver is actively using that
- range. Accidental access to this is obviously disastrous, but
- specific access can be used by people debugging kernel drivers.
+ # cd /sys/kernel/debug/notifier-error-inject/pm/
+ # echo -12 > actions/PM_SUSPEND_PREPARE/error
+ # echo mem > /sys/power/state
+ bash: echo: write error: Cannot allocate memory

- If this option is switched on, the /dev/mem file only allows
- userspace access to *idle* io-memory ranges (see /proc/iomem) This
- may break traditional users of /dev/mem (dosemu, legacy X, etc...)
- if the driver using a given range cannot be disabled.
+ To compile this code as a module, choose M here: the module will
+ be called pm-notifier-error-inject.

- If in doubt, say Y.
+ If unsure, say N.

-config DEBUG_AID_FOR_SYZBOT
- bool "Additional debug code for syzbot"
- default n
- help
- This option is intended for testing by syzbot.
+config OF_RECONFIG_NOTIFIER_ERROR_INJECT
+ tristate "OF reconfig notifier error injection module"
+ depends on OF_DYNAMIC && NOTIFIER_ERROR_INJECTION
+ help
+ This option provides the ability to inject artificial errors to
+ OF reconfig notifier chain callbacks. It is controlled
+ through debugfs interface under
+ /sys/kernel/debug/notifier-error-inject/OF-reconfig/

-menu "$(SRCARCH) Debugging"
+ If the notifier call chain should be failed with some events
+ notified, write the error code to "actions/<notifier event>/error".

-source "arch/$(SRCARCH)/Kconfig.debug"
+ To compile this code as a module, choose M here: the module will
+ be called of-reconfig-notifier-error-inject.

-endmenu
+ If unsure, say N.
+
+config NETDEV_NOTIFIER_ERROR_INJECT
+ tristate "Netdev notifier error injection module"
+ depends on NET && NOTIFIER_ERROR_INJECTION
+ help
+ This option provides the ability to inject artificial errors to
+ netdevice notifier chain callbacks. It is controlled through debugfs
+ interface /sys/kernel/debug/notifier-error-inject/netdev
+
+ If the notifier call chain should be failed with some events
+ notified, write the error code to "actions/<notifier event>/error".
+
+ Example: Inject netdevice mtu change error (-22 = -EINVAL)
+
+ # cd /sys/kernel/debug/notifier-error-inject/netdev
+ # echo -22 > actions/NETDEV_CHANGEMTU/error
+ # ip link set eth0 mtu 1024
+ RTNETLINK answers: Invalid argument
+
+ To compile this code as a module, choose M here: the module will
+ be called netdev-notifier-error-inject.
+
+ If unsure, say N.
+
+config FUNCTION_ERROR_INJECTION
+ def_bool y
+ depends on HAVE_FUNCTION_ERROR_INJECTION && KPROBES
+
+config FAULT_INJECTION
+ bool "Fault-injection framework"
+ depends on DEBUG_KERNEL
+ help
+ Provide fault-injection framework.
+ For more details, see Documentation/fault-injection/.
+
+config FAILSLAB
+ bool "Fault-injection capability for kmalloc"
+ depends on FAULT_INJECTION
+ depends on SLAB || SLUB
+ help
+ Provide fault-injection capability for kmalloc.
+
+config FAIL_PAGE_ALLOC
+ bool "Fault-injection capabilitiy for alloc_pages()"
+ depends on FAULT_INJECTION
+ help
+ Provide fault-injection capability for alloc_pages().
+
+config FAIL_MAKE_REQUEST
+ bool "Fault-injection capability for disk IO"
+ depends on FAULT_INJECTION && BLOCK
+ help
+ Provide fault-injection capability for disk IO.
+
+config FAIL_IO_TIMEOUT
+ bool "Fault-injection capability for faking disk interrupts"
+ depends on FAULT_INJECTION && BLOCK
+ help
+ Provide fault-injection capability on end IO handling. This
+ will make the block layer "forget" an interrupt as configured,
+ thus exercising the error handling.
+
+ Only works with drivers that use the generic timeout handling,
+ for others it wont do anything.
+
+config FAIL_FUTEX
+ bool "Fault-injection capability for futexes"
+ select DEBUG_FS
+ depends on FAULT_INJECTION && FUTEX
+ help
+ Provide fault-injection capability for futexes.
+
+config FAULT_INJECTION_DEBUG_FS
+ bool "Debugfs entries for fault-injection capabilities"
+ depends on FAULT_INJECTION && SYSFS && DEBUG_FS
+ help
+ Enable configuration of fault-injection capabilities via debugfs.
+
+config FAIL_FUNCTION
+ bool "Fault-injection capability for functions"
+ depends on FAULT_INJECTION_DEBUG_FS && FUNCTION_ERROR_INJECTION
+ help
+ Provide function-based fault-injection capability.
+ This will allow you to override a specific function with a return
+ with given return value. As a result, function caller will see
+ an error value and have to handle it. This is useful to test the
+ error handling in various subsystems.
+
+config FAIL_MMC_REQUEST
+ bool "Fault-injection capability for MMC IO"
+ depends on FAULT_INJECTION_DEBUG_FS && MMC
+ help
+ Provide fault-injection capability for MMC IO.
+ This will make the mmc core return data errors. This is
+ useful to test the error handling in the mmc block device
+ and to test how the mmc host driver handles retries from
+ the block device.
+
+config FAULT_INJECTION_STACKTRACE_FILTER
+ bool "stacktrace filter for fault-injection capabilities"
+ depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT
+ depends on !X86_64
+ select STACKTRACE
+ select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM && !ARC && !X86
+ help
+ Provide stacktrace filter for fault-injection capabilities
+
+source "lib/kunit/Kconfig"
+
+endmenu # "Kernel Testing and Coverage"

endmenu # Kernel hacking
--
2.20.1
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