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8c5a19cb17
Full LTO takes the '-mbranch-protection=none' passed to the compiler
when generating the dynamic shadow call stack patching code as a hint to
stop emitting PAC instructions altogether. (Thin LTO appears unaffected
by this)
Work around this by stripping unwind tables from the object in question,
which should be sufficient to prevent the patching code from attempting
to patch itself.
Fixes: 3b619e22c4 ("arm64: implement dynamic shadow call stack for Clang")
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20240110132619.258809-2-ardb+git@google.com
Signed-off-by: Will Deacon <will@kernel.org>
98 lines
3.9 KiB
Makefile
98 lines
3.9 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for the linux kernel.
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#
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CFLAGS_armv8_deprecated.o := -I$(src)
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CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_insn.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_return_address.o = $(CC_FLAGS_FTRACE)
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# Remove stack protector to avoid triggering unneeded stack canary
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# checks due to randomize_kstack_offset.
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CFLAGS_REMOVE_syscall.o = -fstack-protector -fstack-protector-strong
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CFLAGS_syscall.o += -fno-stack-protector
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# When KASAN is enabled, a stack trace is recorded for every alloc/free, which
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# can significantly impact performance. Avoid instrumenting the stack trace
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# collection code to minimize this impact.
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KASAN_SANITIZE_stacktrace.o := n
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# It's not safe to invoke KCOV when portions of the kernel environment aren't
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# available or are out-of-sync with HW state. Since `noinstr` doesn't always
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# inhibit KCOV instrumentation, disable it for the entire compilation unit.
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KCOV_INSTRUMENT_entry-common.o := n
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KCOV_INSTRUMENT_idle.o := n
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# Object file lists.
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obj-y := debug-monitors.o entry.o irq.o fpsimd.o \
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entry-common.o entry-fpsimd.o process.o ptrace.o \
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setup.o signal.o sys.o stacktrace.o time.o traps.o \
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io.o vdso.o hyp-stub.o psci.o cpu_ops.o \
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return_address.o cpuinfo.o cpu_errata.o \
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cpufeature.o alternative.o cacheinfo.o \
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smp.o smp_spin_table.o topology.o smccc-call.o \
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syscall.o proton-pack.o idreg-override.o idle.o \
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patching.o
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obj-$(CONFIG_COMPAT) += sys32.o signal32.o \
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sys_compat.o
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obj-$(CONFIG_COMPAT) += sigreturn32.o
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obj-$(CONFIG_COMPAT_ALIGNMENT_FIXUPS) += compat_alignment.o
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obj-$(CONFIG_KUSER_HELPERS) += kuser32.o
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obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o entry-ftrace.o
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obj-$(CONFIG_MODULES) += module.o module-plts.o
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obj-$(CONFIG_PERF_EVENTS) += perf_regs.o perf_callchain.o
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obj-$(CONFIG_HARDLOCKUP_DETECTOR_PERF) += watchdog_hld.o
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obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
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obj-$(CONFIG_CPU_PM) += sleep.o suspend.o
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obj-$(CONFIG_CPU_IDLE) += cpuidle.o
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obj-$(CONFIG_JUMP_LABEL) += jump_label.o
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obj-$(CONFIG_KGDB) += kgdb.o
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obj-$(CONFIG_EFI) += efi.o efi-rt-wrapper.o
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obj-$(CONFIG_PCI) += pci.o
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obj-$(CONFIG_ARMV8_DEPRECATED) += armv8_deprecated.o
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obj-$(CONFIG_ACPI) += acpi.o
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obj-$(CONFIG_ACPI_NUMA) += acpi_numa.o
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obj-$(CONFIG_ARM64_ACPI_PARKING_PROTOCOL) += acpi_parking_protocol.o
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obj-$(CONFIG_PARAVIRT) += paravirt.o
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obj-$(CONFIG_RANDOMIZE_BASE) += kaslr.o pi/
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obj-$(CONFIG_HIBERNATION) += hibernate.o hibernate-asm.o
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obj-$(CONFIG_ELF_CORE) += elfcore.o
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obj-$(CONFIG_KEXEC_CORE) += machine_kexec.o relocate_kernel.o \
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cpu-reset.o
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obj-$(CONFIG_KEXEC_FILE) += machine_kexec_file.o kexec_image.o
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obj-$(CONFIG_ARM64_RELOC_TEST) += arm64-reloc-test.o
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arm64-reloc-test-y := reloc_test_core.o reloc_test_syms.o
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obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
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obj-$(CONFIG_CRASH_CORE) += crash_core.o
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obj-$(CONFIG_ARM_SDE_INTERFACE) += sdei.o
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obj-$(CONFIG_ARM64_PTR_AUTH) += pointer_auth.o
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obj-$(CONFIG_ARM64_MTE) += mte.o
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obj-y += vdso-wrap.o
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obj-$(CONFIG_COMPAT_VDSO) += vdso32-wrap.o
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obj-$(CONFIG_UNWIND_PATCH_PAC_INTO_SCS) += patch-scs.o
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# We need to prevent the SCS patching code from patching itself. Using
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# -mbranch-protection=none here to avoid the patchable PAC opcodes from being
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# generated triggers an issue with full LTO on Clang, which stops emitting PAC
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# instructions altogether. So instead, omit the unwind tables used by the
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# patching code, so it will not be able to locate its own PAC instructions.
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CFLAGS_patch-scs.o += -fno-asynchronous-unwind-tables -fno-unwind-tables
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# Force dependency (vdso*-wrap.S includes vdso.so through incbin)
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$(obj)/vdso-wrap.o: $(obj)/vdso/vdso.so
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$(obj)/vdso32-wrap.o: $(obj)/vdso32/vdso.so
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obj-y += probes/
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obj-y += head.o
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extra-y += vmlinux.lds
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ifeq ($(CONFIG_DEBUG_EFI),y)
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AFLAGS_head.o += -DVMLINUX_PATH="\"$(realpath $(objtree)/vmlinux)\""
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endif
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# for cleaning
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subdir- += vdso vdso32
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