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lib: Update ASan compiler flags and Kconfig help text 

An additional compiler flag is added to make use of the shadow
offset callback feature we introduced in our GCC patch. Also,
a comment is added to tell user that this GCC patch needs to be
applied in order to use ASan.

Change-Id: Ia187e4991bf808f4ae137eff0ffdb9baea0085e9
Signed-off-by: Harshit Sharma <harshitsharmajs@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43164
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
This commit is contained in:
Harshit Sharma 2020-07-06 23:38:31 -07:00 committed by Patrick Georgi
parent 2bcaba0fd4
commit 3b9cc859ff
2 changed files with 7 additions and 1 deletions
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5
src/Kconfig
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@ -283,6 +283,11 @@ config ASAN_IN_RAMSTAGE
If unsure, say N. If unsure, say N.
if ASAN_IN_RAMSTAGE
comment "Before using this feature, make sure that "
comment "asan_shadow_offset_callback patch is applied to GCC."
endif
choice choice
prompt "Stage Cache for ACPI S3 resume" prompt "Stage Cache for ACPI S3 resume"
default NO_STAGE_CACHE if !HAVE_ACPI_RESUME default NO_STAGE_CACHE if !HAVE_ACPI_RESUME

3
src/lib/Makefile.inc
View File

@ -9,7 +9,8 @@ endif
ifeq ($(CONFIG_ASAN_IN_RAMSTAGE),y) ifeq ($(CONFIG_ASAN_IN_RAMSTAGE),y)
ramstage-y += asan.c ramstage-y += asan.c
CFLAGS_asan += -fsanitize=kernel-address \ # Ensure that asan_shadow_offset_callback patch is applied to GCC before ASan is used.
CFLAGS_asan += -fsanitize=kernel-address --param asan-use-shadow-offset-callback=1 \
--param asan-stack=1 --param asan-globals=1 \ --param asan-stack=1 --param asan-globals=1 \
--param asan-instrumentation-with-call-threshold=0 \ --param asan-instrumentation-with-call-threshold=0 \
-fsanitize-address-use-after-scope \ -fsanitize-address-use-after-scope \