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ubsan: Clarify Kconfig text for CONFIG_UBSAN_TRAP 

Make it clearer in the one-line description and the verbose description
text that CONFIG_UBSAN_TRAP as currently implemented involves a tradeoff of
much less helpful oops messages in exchange for a smaller kernel image.
(With the additional effect of turning UBSAN warnings into crashes, which
may or may not be desired.)

Signed-off-by: Jann Horn <jannh@google.com>
Link: https://lore.kernel.org/r/20230705215128.486054-1-jannh@google.com
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Jann Horn 2023-07-05 23:51:27 +02:00 committed by Kees Cook
parent fdf0eaf114
commit ce6616724f
1 changed files with 9 additions and 1 deletions
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10
lib/Kconfig.ubsan
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@ -13,7 +13,7 @@ menuconfig UBSAN
if UBSAN
config UBSAN_TRAP
bool "On Sanitizer warnings, abort the running kernel code"
bool "Abort on Sanitizer warnings (smaller kernel but less verbose)"
depends on !COMPILE_TEST
help
Building kernels with Sanitizer features enabled tends to grow
@ -26,6 +26,14 @@ config UBSAN_TRAP
the system. For some system builders this is an acceptable
trade-off.
Also note that selecting Y will cause your kernel to Oops
with an "illegal instruction" error with no further details
when a UBSAN violation occurs. (Except on arm64, which will
report which Sanitizer failed.) This may make it hard to
determine whether an Oops was caused by UBSAN or to figure
out the details of a UBSAN violation. It makes the kernel log
output less useful for bug reports.
config CC_HAS_UBSAN_BOUNDS_STRICT
def_bool $(cc-option,-fsanitize=bounds-strict)
help