s390/kasan: double the stack size (7fef92cc) · Commits · 戴 / test

Kasan stack instrumentation pads stack variables with redzones, which increases stack frames size significantly. Stack sizes are increased from 16k to 32k in the code, as well as for the kernel stack overflow detection option (CHECK_STACK). Reviewed-by:

Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by:

Vasily Gorbik <gor@linux.ibm.com> Signed-off-by:

Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -27,7 +27,7 @@ KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-option,-ffreestanding)
		KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
		KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
		UTS_MACHINE := s390x
		STACK_SIZE := 16384
		STACK_SIZE := $(if $(CONFIG_KASAN),32768,16384)
		CHECKFLAGS += -D__s390__ -D__s390x__

		export LD_BFD

arch/s390/include/asm/thread_info.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -13,7 +13,11 @@
		/*
		* General size of kernel stacks
		*/
		#ifdef CONFIG_KASAN
		#define THREAD_SIZE_ORDER 3
		#else
		#define THREAD_SIZE_ORDER 2
		#endif
		#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)

		#ifndef __ASSEMBLY__

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