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build: Add option KERNEL_KASAN_SW_TAGS and HW_TAGS 

Currently KASAN is supported but only the generic one. SW-tag and HW-tag
based KASAN have less impact on memory footprint or performance, and are
worth supporting.

Add choice menu for software and hardware Tag-Based KASAN, in addition
to the generic one.

Signed-off-by: Zhen XIN <zhen.xin@nokia-sbell.com>
[Restructure commit message]
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
This commit is contained in:
Zhen XIN 2023-07-04 09:44:01 +00:00 committed by Hauke Mehrtens
parent 5e6bab661a
commit d2af5ab850
1 changed files with 61 additions and 4 deletions
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65
config/Config-kernel.in
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@ -184,16 +184,73 @@ config KERNEL_KASAN_VMALLOC
will have no effect.
if KERNEL_KASAN
config KERNEL_KASAN_GENERIC
def_bool y
choice
prompt "KASAN mode"
depends on KERNEL_KASAN
default KERNEL_KASAN_GENERIC
help
KASAN has three modes:
1. Generic KASAN (supported by many architectures, enabled with
CONFIG_KASAN_GENERIC, similar to userspace ASan),
2. Software Tag-Based KASAN (arm64 only, based on software memory
tagging, enabled with CONFIG_KASAN_SW_TAGS, similar to userspace
HWASan), and
3. Hardware Tag-Based KASAN (arm64 only, based on hardware memory
tagging, enabled with CONFIG_KASAN_HW_TAGS).
config KERNEL_KASAN_GENERIC
bool "Generic KASAN"
select KERNEL_SLUB_DEBUG
help
Enables Generic KASAN.
Consumes about 1/8th of available memory at kernel start and adds an
overhead of ~50% for dynamic allocations.
The performance slowdown is ~x3.
config KERNEL_KASAN_SW_TAGS
bool "Software Tag-Based KASAN"
depends on aarch64
select KERNEL_SLUB_DEBUG
help
Enables Software Tag-Based KASAN.
Supported only on arm64 CPUs and relies on Top Byte Ignore.
Consumes about 1/16th of available memory at kernel start and
add an overhead of ~20% for dynamic allocations.
May potentially introduce problems related to pointer casting and
comparison, as it embeds a tag into the top byte of each pointer.
config KERNEL_KASAN_HW_TAGS
bool "Hardware Tag-Based KASAN"
depends on aarch64
select KERNEL_SLUB_DEBUG
select KERNEL_ARM64_MTE
help
Enables Hardware Tag-Based KASAN.
Supported only on arm64 CPUs starting from ARMv8.5 and relies on
Memory Tagging Extension and Top Byte Ignore.
Consumes about 1/32nd of available memory.
May potentially introduce problems related to pointer casting and
comparison, as it embeds a tag into the top byte of each pointer.
endchoice
config KERNEL_ARM64_MTE
def_bool n
config KERNEL_KASAN_SW_TAGS
def_bool n
endif
choice
prompt "Instrumentation type"
depends on KERNEL_KASAN
depends on !KERNEL_KASAN_HW_TAGS
default KERNEL_KASAN_OUTLINE
config KERNEL_KASAN_OUTLINE