Commit 921757bc authored Oct 24, 2022 by Alexander Potapenko Committed by Andrew Morton Oct 28, 2022

Kconfig.debug: disable CONFIG_FRAME_WARN for KMSAN by default

KMSAN adds a lot of instrumentation to the code, which results in
increased stack usage (up to 2048 bytes and more in some cases).  It's
hard to predict how big the stack frames can be, so we disable the
warnings for KMSAN instead.

Link: https://lkml.kernel.org/r/20221024212144.2852069-3-glider@google.com
Link: https://github.com/google/kmsan/issues/89


Signed-off-by: Alexander Potapenko <glider@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

parent 42855f58

lib/Kconfig.debug

+2 −1

Original line number	Diff line number	Diff line
		@@ -400,8 +400,9 @@ config FRAME_WARN
		default 1536 if (!64BIT && XTENSA)
		default 1024 if !64BIT
		default 2048 if 64BIT
		default 0 if KMSAN
		help
		Tell gcc to warn at build time for stack frames larger than this.
		Tell the compiler to warn at build time for stack frames larger than this.
		Setting this too low will cause a lot of warnings.
		Setting it to 0 disables the warning.