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Commit 7fef92cc authored Nov 17, 2017 by Vasily Gorbik Committed by Martin Schwidefsky Oct 09, 2018

s390/kasan: double the stack size



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>

parent 42db5ed8

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__