s390: add support for FORTIFY_SOURCE
This is the quite trivial backend for s390 which is required to enable
FORTIFY_SOURCE support.
See commit 6974f0c455
("include/linux/string.h: add the option of
fortified string.h functions") for more details.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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@ -67,6 +67,7 @@ config S390
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select ARCH_BINFMT_ELF_STATE
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select ARCH_HAS_DEVMEM_IS_ALLOWED
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select ARCH_HAS_ELF_RANDOMIZE
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select ARCH_HAS_FORTIFY_SOURCE
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select ARCH_HAS_GCOV_PROFILE_ALL
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select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
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select ARCH_HAS_KCOV
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@ -11,7 +11,7 @@ targets += vmlinux.bin.xz vmlinux.bin.lzma vmlinux.bin.lzo vmlinux.bin.lz4
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targets += misc.o piggy.o sizes.h head.o
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KBUILD_CFLAGS := -m64 -D__KERNEL__ -O2
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KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
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KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
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KBUILD_CFLAGS += $(cflags-y) -fno-delete-null-pointer-checks -msoft-float
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KBUILD_CFLAGS += $(call cc-option,-mpacked-stack)
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KBUILD_CFLAGS += $(call cc-option,-ffreestanding)
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@ -49,7 +49,7 @@ extern char *strstr(const char *, const char *);
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#undef __HAVE_ARCH_STRSEP
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#undef __HAVE_ARCH_STRSPN
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#if !defined(IN_ARCH_STRING_C)
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#if !defined(IN_ARCH_STRING_C) && (!defined(CONFIG_FORTIFY_SOURCE) || defined(__NO_FORTIFY))
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static inline void *memchr(const void * s, int c, size_t n)
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{
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@ -33,6 +33,8 @@ AFLAGS_REMOVE_head.o += $(CC_FLAGS_MARCH)
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AFLAGS_head.o += -march=z900
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endif
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CFLAGS_als.o += -D__NO_FORTIFY
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#
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# Passing null pointers is ok for smp code, since we access the lowcore here.
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#
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