OVMS3-idf/Kconfig
Alexey Gerenkov 692a890232 esp32: Adds Stack Smashing Protection Feature
These changes add posibility to enable GCC stack protector via menuconfig
for all source files in project.
2017-11-17 12:08:36 +03:00

147 lines
5.1 KiB
Text

#
# For a description of the syntax of this configuration file,
# see kconfig/kconfig-language.txt.
#
mainmenu "Espressif IoT Development Framework Configuration"
menu "SDK tool configuration"
config TOOLPREFIX
string "Compiler toolchain path/prefix"
default "xtensa-esp32-elf-"
help
The prefix/path that is used to call the toolchain. The default setting assumes
a crosstool-ng gcc setup that is in your PATH.
config PYTHON
string "Python 2 interpreter"
default "python"
help
The executable name/path that is used to run python. On some systems Python 2.x
may need to be invoked as python2.
config MAKE_WARN_UNDEFINED_VARIABLES
bool "'make' warns on undefined variables"
default "y"
help
Adds --warn-undefined-variables to MAKEFLAGS. This causes make to
print a warning any time an undefined variable is referenced.
This option helps find places where a variable reference is misspelled
or otherwise missing, but it can be unwanted if you have Makefiles which
depend on undefined variables expanding to an empty string.
endmenu # SDK tool configuration
source "$COMPONENT_KCONFIGS_PROJBUILD"
menu "Compiler options"
choice OPTIMIZATION_COMPILER
prompt "Optimization Level"
default OPTIMIZATION_LEVEL_DEBUG
help
This option sets compiler optimization level (gcc -O argument).
- for "Release" setting, -Os flag is added to CFLAGS.
- for "Debug" setting, -Og flag is added to CFLAGS.
"Release" with -Os produces smaller & faster compiled code but it
may be harder to correlated code addresses to source files when debugging.
To add custom optimization settings, set CFLAGS and/or CPPFLAGS
in project makefile, before including $(IDF_PATH)/make/project.mk. Note that
custom optimization levels may be unsupported.
config OPTIMIZATION_LEVEL_DEBUG
bool "Debug (-Og)"
config OPTIMIZATION_LEVEL_RELEASE
bool "Release (-Os)"
endchoice
choice OPTIMIZATION_ASSERTION_LEVEL
prompt "Assertion level"
default OPTIMIZATION_ASSERTIONS_ENABLED
help
Assertions can be:
- Enabled. Failure will print verbose assertion details. This is the default.
- Set to "silent" to save code size (failed assertions will abort() but user
needs to use the aborting address to find the line number with the failed assertion.)
- Disabled entirely (not recommended for most configurations.) -DNDEBUG is added
to CPPFLAGS in this case.
config OPTIMIZATION_ASSERTIONS_ENABLED
prompt "Enabled"
bool
help
Enable assertions. Assertion content and line number will be printed on failure.
config OPTIMIZATION_ASSERTIONS_SILENT
prompt "Silent (saves code size)"
bool
help
Enable silent assertions. Failed assertions will abort(), user needs to
use the aborting address to find the line number with the failed assertion.
config OPTIMIZATION_ASSERTIONS_DISABLED
prompt "Disabled (sets -DNDEBUG)"
bool
help
If assertions are disabled, -DNDEBUG is added to CPPFLAGS.
endchoice # assertions
config CXX_EXCEPTIONS
bool "Enable C++ exceptions"
default n
help
Enabling this option compiles all IDF C++ files with exception support enabled.
Disabling this option disables C++ exception support in all compiled files, and any libstdc++ code which throws
an exception will abort instead.
Enabling this option currently adds an additional 20KB of heap overhead, and 4KB of additional heap is allocated
the first time an exception is thrown in user code.
choice STACK_CHECK_MODE
prompt "Stack smashing protection mode"
default STACK_CHECK_NONE
help
Stack smashing protection mode. Emit extra code to check for buffer overflows, such as stack
smashing attacks. This is done by adding a guard variable to functions with vulnerable objects.
The guards are initialized when a function is entered and then checked when the function exits.
If a guard check fails, program is halted. Protection has the following modes:
- In NORMAL mode (GCC flag: -fstack-protector) only functions that call alloca, and functions with buffers larger than
8 bytes are protected.
- STRONG mode (GCC flag: -fstack-protector-strong) is like NORMAL, but includes additional functions to be protected -- those that
have local array definitions, or have references to local frame addresses.
- In OVERALL mode (GCC flag: -fstack-protector-all) all functions are protected.
Modes have the following impact on code performance and coverage:
- performance: NORMAL > STRONG > OVERALL
- coverage: NORMAL < STRONG < OVERALL
config STACK_CHECK_NONE
bool "None"
config STACK_CHECK_NORM
bool "Normal"
config STACK_CHECK_STRONG
bool "Strong"
config STACK_CHECK_ALL
bool "Overall"
endchoice
config STACK_CHECK
bool
default !STACK_CHECK_NONE
help
Stack smashing protection.
endmenu # Compiler Options
menu "Component config"
source "$COMPONENT_KCONFIGS"
endmenu