Building an arm64 allmodconfig kernel with clang results in over 140 warnings about overly large stack frames, the worst ones being: drivers/gpu/drm/panel/panel-sitronix-st7789v.c:196:12: error: stack frame size of 20224 bytes in function 'st7789v_prepare' drivers/video/fbdev/omap2/omapfb/displays/panel-tpo-td028ttec1.c:196:12: error: stack frame size of 13120 bytes in function 'td028ttec1_panel_enable' drivers/usb/host/max3421-hcd.c:1395:1: error: stack frame size of 10048 bytes in function 'max3421_spi_thread' drivers/net/wan/slic_ds26522.c:209:12: error: stack frame size of 9664 bytes in function 'slic_ds26522_probe' drivers/crypto/ccp/ccp-ops.c:2434:5: error: stack frame size of 8832 bytes in function 'ccp_run_cmd' drivers/media/dvb-frontends/stv0367.c:1005:12: error: stack frame size of 7840 bytes in function 'stv0367ter_algo' None of these happen with gcc today, and almost all of these are the result of a single known bug in llvm. Hopefully it will eventually get fixed with the clang-9 release. In the meantime, the best idea I have is to turn off asan-stack for clang-8 and earlier, so we can produce a kernel that is safe to run. I have posted three patches that address the frame overflow warnings that are not addressed by turning off asan-stack, so in combination with this change, we get much closer to a clean allmodconfig build, which in turn is necessary to do meaningful build regression testing. Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> Cc: Mark Brown <broonie@xxxxxxxxxx> Cc: Qian Cai <cai@xxxxxx> Link: https://bugs.llvm.org/show_bug.cgi?id=38809 Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> --- lib/Kconfig.kasan | 13 +++++++++++++ scripts/Makefile.kasan | 2 +- 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan index 67d7d1309c52..219cddc913ac 100644 --- a/lib/Kconfig.kasan +++ b/lib/Kconfig.kasan @@ -103,6 +103,19 @@ config KASAN_INLINE endchoice +config KASAN_STACK + int + default 0 if CC_IS_CLANG && (CLANG_VERSION < 90000) + default 1 + help + The LLVM stack address sanitizer has a know bug that + causes excessive stack usage in a lot of functions, see + https://bugs.llvm.org/show_bug.cgi?id=38809 + Disabling asan-stack makes it safe to run kernels build + with clang-8 with KASAN enabled, though it loses some of + the functionality. We assume that clang-9 will have a fix, + so the feature can be used. + config KASAN_S390_4_LEVEL_PAGING bool "KASan: use 4-level paging" depends on KASAN && S390 diff --git a/scripts/Makefile.kasan b/scripts/Makefile.kasan index f1fb8e502657..6410bd22fe38 100644 --- a/scripts/Makefile.kasan +++ b/scripts/Makefile.kasan @@ -26,7 +26,7 @@ else CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \ $(call cc-param,asan-globals=1) \ $(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \ - $(call cc-param,asan-stack=1) \ + $(call cc-param,asan-stack=$(CONFIG_KASAN_STACK)) \ $(call cc-param,asan-instrument-allocas=1) endif -- 2.20.0
