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hardening: Move BUG_ON_DATA_CORRUPTION to hardening options

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BUG_ON_DATA_CORRUPTION is turning detected corruptions of list data
structures from WARNings into BUGs. This can be useful to stop further
corruptions or even exploitation attempts.

However, the option has less to do with debugging than with hardening.
With the introduction of LIST_HARDENED, it makes more sense to move it
to the hardening options, where it selects LIST_HARDENED instead.

Without this change, combining BUG_ON_DATA_CORRUPTION with LIST_HARDENED
alone wouldn't be possible, because DEBUG_LIST would always be selected
by BUG_ON_DATA_CORRUPTION.

Signed-off-by: Marco Elver <elver@google.com>
Link: https://lore.kernel.org/r/20230811151847.1594958-4-elver@google.com
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Marco Elver 2023-08-11 17:18:41 +02:00 committed by Kees Cook
parent aebc7b0d8d
commit aa9f10d570
2 changed files with 11 additions and 11 deletions
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12
lib/Kconfig.debug
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@ -1673,7 +1673,7 @@ menu "Debug kernel data structures"
config DEBUG_LIST
bool "Debug linked list manipulation"
depends on DEBUG_KERNEL || BUG_ON_DATA_CORRUPTION
depends on DEBUG_KERNEL
select LIST_HARDENED
help
Enable this to turn on extended checks in the linked-list walking
@ -1715,16 +1715,6 @@ config DEBUG_NOTIFIERS
This is a relatively cheap check but if you care about maximum
performance, say N.
config BUG_ON_DATA_CORRUPTION
bool "Trigger a BUG when data corruption is detected"
select DEBUG_LIST
help
Select this option if the kernel should BUG when it encounters
data corruption in kernel memory structures when they get checked
for validity.
If unsure, say N.
config DEBUG_MAPLE_TREE
bool "Debug maple trees"
depends on DEBUG_KERNEL

10
security/Kconfig.hardening
View File

@ -290,6 +290,16 @@ config LIST_HARDENED
If unsure, say N.
config BUG_ON_DATA_CORRUPTION
bool "Trigger a BUG when data corruption is detected"
select LIST_HARDENED
help
Select this option if the kernel should BUG when it encounters
data corruption in kernel memory structures when they get checked
for validity.
If unsure, say N.
endmenu
config CC_HAS_RANDSTRUCT