mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-08-31 22:23:05 +00:00
f287822688
When FRED is enabled, if the Trap Flag (TF) is set without an external debugger attached, it can lead to an infinite loop in the SIGTRAP handler. To avoid this, the software event flag in the augmented SS must be cleared, ensuring that no single-step trap remains pending when ERETU completes. This test checks for that specific scenario—verifying whether the kernel correctly prevents an infinite SIGTRAP loop in this edge case when FRED is enabled. The test should _always_ pass with IDT event delivery, thus no need to disable the test even when FRED is not enabled. Signed-off-by: Xin Li (Intel) <xin@zytor.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Tested-by: Sohil Mehta <sohil.mehta@intel.com> Cc:stable@vger.kernel.org Link: https://lore.kernel.org/all/20250609084054.2083189-3-xin%40zytor.com
140 lines
4.9 KiB
Makefile
140 lines
4.9 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 sigtrap_loop \
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syscall_arg_fault fsgsbase_restore sigaltstack
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TARGETS_C_BOTHBITS += nx_stack
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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 test_shadow_stack avx apx
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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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ifneq ($(LLVM),)
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# clang only wants to see -no-pie during linking. Here, we don't have a separate
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# linking stage, so a compiler warning is unavoidable without (wastefully)
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# restructuring the Makefile. Avoid this by simply disabling that warning.
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CFLAGS += -Wno-unused-command-line-argument
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endif
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endif
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define gen-target-rule-32
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$(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) $(BINARIES_64) srso
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$(BINARIES_32): $(OUTPUT)/%_32: %.c helpers.h
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$(CC) -m32 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $< $(EXTRA_FILES) -lrt -ldl -lm
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$(BINARIES_64): $(OUTPUT)/%_64: %.c helpers.h
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$(CC) -m64 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $< $(EXTRA_FILES) -lrt -ldl
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# x86_64 users should be encouraged to install 32-bit libraries
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ifeq ($(CAN_BUILD_I386)$(CAN_BUILD_X86_64),01)
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all: warn_32bit_failure
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warn_32bit_failure:
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@echo "Warning: you seem to have a broken 32-bit build" 2>&1; \
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echo "environment. This will reduce test coverage of 64-bit" 2>&1; \
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echo "kernels. If you are using a Debian-like distribution," 2>&1; \
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echo "try:"; 2>&1; \
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echo ""; \
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echo " apt-get install gcc-multilib libc6-i386 libc6-dev-i386"; \
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echo ""; \
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echo "If you are using a Fedora-like distribution, try:"; \
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echo ""; \
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echo " yum install glibc-devel.*i686"; \
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echo ""; \
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echo "If you are using a SUSE-like distribution, try:"; \
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echo ""; \
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echo " zypper install gcc-32bit glibc-devel-static-32bit"; \
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exit 0;
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endif
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# Add an additional file to the source file list for a given target, and also
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# add a Makefile dependency on that same file. However, do these separately, so
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# that the compiler invocation ("$(CC) file1.c file2.S") is not combined with
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# the dependencies ("header3.h"), because clang, unlike gcc, will not accept
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# header files as an input to the compiler invocation.
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define extra-files
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$(OUTPUT)/$(1): EXTRA_FILES := $(2)
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$(OUTPUT)/$(1): $(2)
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endef
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$(eval $(call extra-files,sysret_ss_attrs_64,thunks.S))
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$(eval $(call extra-files,ptrace_syscall_32,raw_syscall_helper_32.S))
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$(eval $(call extra-files,test_syscall_vdso_32,thunks_32.S))
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$(eval $(call extra-files,fsgsbase_restore_64,clang_helpers_64.S))
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$(eval $(call extra-files,fsgsbase_restore_32,clang_helpers_32.S))
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$(eval $(call extra-files,sysret_rip_64,clang_helpers_64.S))
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# check_initial_reg_state is special: it needs a custom entry, and it
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# needs to be static so that its interpreter doesn't destroy its initial
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# state.
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$(OUTPUT)/check_initial_reg_state_32: CFLAGS += -Wl,-ereal_start -static
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$(OUTPUT)/check_initial_reg_state_64: CFLAGS += -Wl,-ereal_start -static
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$(OUTPUT)/nx_stack_32: CFLAGS += -Wl,-z,noexecstack
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$(OUTPUT)/nx_stack_64: CFLAGS += -Wl,-z,noexecstack
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$(OUTPUT)/avx_64: CFLAGS += -mno-avx -mno-avx512f
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$(OUTPUT)/amx_64: EXTRA_FILES += xstate.c
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$(OUTPUT)/avx_64: EXTRA_FILES += xstate.c
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$(OUTPUT)/apx_64: EXTRA_FILES += xstate.c
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