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34bfeea4a9
Pages allocated by the kernel are not guaranteed to have the tags zeroed, especially as the kernel does not (yet) use MTE itself. To ensure the user can still access such pages when mapped into its address space, clear the tags via set_pte_at(). A new page flag - PG_mte_tagged (PG_arch_2) - is used to track pages with valid allocation tags. Since the zero page is mapped as pte_special(), it won't be covered by the above set_pte_at() mechanism. Clear its tags during early MTE initialisation. Co-developed-by: Steven Price <steven.price@arm.com> Signed-off-by: Steven Price <steven.price@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org>
20 lines
647 B
Makefile
20 lines
647 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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lib-y := clear_user.o delay.o copy_from_user.o \
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copy_to_user.o copy_in_user.o copy_page.o \
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clear_page.o csum.o memchr.o memcpy.o memmove.o \
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memset.o memcmp.o strcmp.o strncmp.o strlen.o \
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strnlen.o strchr.o strrchr.o tishift.o
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ifeq ($(CONFIG_KERNEL_MODE_NEON), y)
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obj-$(CONFIG_XOR_BLOCKS) += xor-neon.o
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CFLAGS_REMOVE_xor-neon.o += -mgeneral-regs-only
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CFLAGS_xor-neon.o += -ffreestanding
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endif
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lib-$(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) += uaccess_flushcache.o
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obj-$(CONFIG_CRC32) += crc32.o
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obj-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o
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obj-$(CONFIG_ARM64_MTE) += mte.o
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