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LAM is supported only in 64-bit mode and applies only addresses used for data accesses. In 64-bit mode, linear address have 64 bits. LAM is applied to 64-bit linear address and allow software to use high bits for metadata. LAM supports configurations that differ regarding which pointer bits are masked and can be used for metadata. LAM includes following mode: - LAM_U57, pointer bits in positions 62:57 are masked (LAM width 6), allows bits 62:57 of a user pointer to be used as metadata. There are some arch_prctls: ARCH_ENABLE_TAGGED_ADDR: enable LAM mode, mask high bits of a user pointer. ARCH_GET_UNTAG_MASK: get current untagged mask. ARCH_GET_MAX_TAG_BITS: the maximum tag bits user can request. zero if LAM is not supported. The LAM mode is for pre-process, a process has only one chance to set LAM mode. But there is no API to disable LAM mode. So all of test cases are run under child process. Functions of this test: MALLOC - LAM_U57 masks bits 57:62 of a user pointer. Process on user space can dereference such pointers. - Disable LAM, dereference a pointer with metadata above 48 bit or 57 bit lead to trigger SIGSEGV. TAG_BITS - Max tag bits of LAM_U57 is 6. Signed-off-by: Weihong Zhang <weihong.zhang@intel.com> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/all/20230312112612.31869-13-kirill.shutemov%40linux.intel.com
112 lines
3.6 KiB
Makefile
112 lines
3.6 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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all:
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include ../lib.mk
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.PHONY: all all_32 all_64 warn_32bit_failure clean
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UNAME_M := $(shell uname -m)
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CAN_BUILD_I386 := $(shell ./check_cc.sh "$(CC)" trivial_32bit_program.c -m32)
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CAN_BUILD_X86_64 := $(shell ./check_cc.sh "$(CC)" trivial_64bit_program.c)
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CAN_BUILD_WITH_NOPIE := $(shell ./check_cc.sh "$(CC)" trivial_program.c -no-pie)
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TARGETS_C_BOTHBITS := single_step_syscall sysret_ss_attrs syscall_nt test_mremap_vdso \
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check_initial_reg_state sigreturn iopl ioperm \
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test_vsyscall mov_ss_trap \
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syscall_arg_fault fsgsbase_restore sigaltstack
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TARGETS_C_32BIT_ONLY := entry_from_vm86 test_syscall_vdso unwind_vdso \
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test_FCMOV test_FCOMI test_FISTTP \
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vdso_restorer
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TARGETS_C_64BIT_ONLY := fsgsbase sysret_rip syscall_numbering \
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corrupt_xstate_header amx lam
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# Some selftests require 32bit support enabled also on 64bit systems
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TARGETS_C_32BIT_NEEDED := ldt_gdt ptrace_syscall
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TARGETS_C_32BIT_ALL := $(TARGETS_C_BOTHBITS) $(TARGETS_C_32BIT_ONLY) $(TARGETS_C_32BIT_NEEDED)
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TARGETS_C_64BIT_ALL := $(TARGETS_C_BOTHBITS) $(TARGETS_C_64BIT_ONLY)
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ifeq ($(CAN_BUILD_I386)$(CAN_BUILD_X86_64),11)
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TARGETS_C_64BIT_ALL += $(TARGETS_C_32BIT_NEEDED)
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endif
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BINARIES_32 := $(TARGETS_C_32BIT_ALL:%=%_32)
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BINARIES_64 := $(TARGETS_C_64BIT_ALL:%=%_64)
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BINARIES_32 := $(patsubst %,$(OUTPUT)/%,$(BINARIES_32))
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BINARIES_64 := $(patsubst %,$(OUTPUT)/%,$(BINARIES_64))
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CFLAGS := -O2 -g -std=gnu99 -pthread -Wall $(KHDR_INCLUDES)
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# call32_from_64 in thunks.S uses absolute addresses.
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ifeq ($(CAN_BUILD_WITH_NOPIE),1)
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CFLAGS += -no-pie
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endif
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define gen-target-rule-32
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$(1) $(1)_32: $(OUTPUT)/$(1)_32
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.PHONY: $(1) $(1)_32
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endef
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define gen-target-rule-64
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$(1) $(1)_64: $(OUTPUT)/$(1)_64
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.PHONY: $(1) $(1)_64
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endef
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ifeq ($(CAN_BUILD_I386),1)
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all: all_32
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TEST_PROGS += $(BINARIES_32)
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EXTRA_CFLAGS += -DCAN_BUILD_32
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$(foreach t,$(TARGETS_C_32BIT_ALL),$(eval $(call gen-target-rule-32,$(t))))
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endif
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ifeq ($(CAN_BUILD_X86_64),1)
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all: all_64
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TEST_PROGS += $(BINARIES_64)
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EXTRA_CFLAGS += -DCAN_BUILD_64
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$(foreach t,$(TARGETS_C_64BIT_ALL),$(eval $(call gen-target-rule-64,$(t))))
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endif
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all_32: $(BINARIES_32)
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all_64: $(BINARIES_64)
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EXTRA_CLEAN := $(BINARIES_32) $(BINARIES_64)
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$(BINARIES_32): $(OUTPUT)/%_32: %.c helpers.h
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$(CC) -m32 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $^ -lrt -ldl -lm
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$(BINARIES_64): $(OUTPUT)/%_64: %.c helpers.h
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$(CC) -m64 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $^ -lrt -ldl
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# x86_64 users should be encouraged to install 32-bit libraries
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ifeq ($(CAN_BUILD_I386)$(CAN_BUILD_X86_64),01)
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all: warn_32bit_failure
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warn_32bit_failure:
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@echo "Warning: you seem to have a broken 32-bit build" 2>&1; \
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echo "environment. This will reduce test coverage of 64-bit" 2>&1; \
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echo "kernels. If you are using a Debian-like distribution," 2>&1; \
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echo "try:"; 2>&1; \
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echo ""; \
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echo " apt-get install gcc-multilib libc6-i386 libc6-dev-i386"; \
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echo ""; \
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echo "If you are using a Fedora-like distribution, try:"; \
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echo ""; \
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echo " yum install glibc-devel.*i686"; \
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echo ""; \
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echo "If you are using a SUSE-like distribution, try:"; \
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echo ""; \
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echo " zypper install gcc-32bit glibc-devel-static-32bit"; \
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exit 0;
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endif
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# Some tests have additional dependencies.
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$(OUTPUT)/sysret_ss_attrs_64: thunks.S
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$(OUTPUT)/ptrace_syscall_32: raw_syscall_helper_32.S
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$(OUTPUT)/test_syscall_vdso_32: thunks_32.S
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# check_initial_reg_state is special: it needs a custom entry, and it
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# needs to be static so that its interpreter doesn't destroy its initial
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# state.
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$(OUTPUT)/check_initial_reg_state_32: CFLAGS += -Wl,-ereal_start -static
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$(OUTPUT)/check_initial_reg_state_64: CFLAGS += -Wl,-ereal_start -static
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