diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/Kconfig | 16 | ||||
| -rw-r--r-- | arch/arm64/Kconfig | 14 | ||||
| -rw-r--r-- | arch/arm64/Makefile | 3 | ||||
| -rw-r--r-- | arch/riscv/Kconfig | 9 | ||||
| -rw-r--r-- | arch/x86/Makefile | 11 |
5 files changed, 50 insertions, 3 deletions
diff --git a/arch/Kconfig b/arch/Kconfig index 405c85ab86f2..98157b38f5cf 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -835,6 +835,22 @@ config CFI_CLANG https://clang.llvm.org/docs/ControlFlowIntegrity.html +config CFI_ICALL_NORMALIZE_INTEGERS + bool "Normalize CFI tags for integers" + depends on CFI_CLANG + depends on $(cc-option,-fsanitize=kcfi -fsanitize-cfi-icall-experimental-normalize-integers) + help + This option normalizes the CFI tags for integer types so that all + integer types of the same size and signedness receive the same CFI + tag. + + The option is separate from CONFIG_RUST because it affects the ABI. + When working with build systems that care about the ABI, it is + convenient to be able to turn on this flag first, before Rust is + turned on. + + This option is necessary for using CFI with Rust. If unsure, say N. + config CFI_PERMISSIVE bool "Use CFI in permissive mode" depends on CFI_CLANG diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 49f054dcd4de..3e29b44d2d7b 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -235,7 +235,7 @@ config ARM64 select HAVE_FUNCTION_ARG_ACCESS_API select MMU_GATHER_RCU_TABLE_FREE select HAVE_RSEQ - select HAVE_RUST if CPU_LITTLE_ENDIAN + select HAVE_RUST if RUSTC_SUPPORTS_ARM64 select HAVE_STACKPROTECTOR select HAVE_SYSCALL_TRACEPOINTS select HAVE_KPROBES @@ -270,6 +270,18 @@ config ARM64 help ARM 64-bit (AArch64) Linux support. +config RUSTC_SUPPORTS_ARM64 + def_bool y + depends on CPU_LITTLE_ENDIAN + # Shadow call stack is only supported on certain rustc versions. + # + # When using the UNWIND_PATCH_PAC_INTO_SCS option, rustc version 1.80+ is + # required due to use of the -Zfixed-x18 flag. + # + # Otherwise, rustc version 1.82+ is required due to use of the + # -Zsanitizer=shadow-call-stack flag. + depends on !SHADOW_CALL_STACK || RUSTC_VERSION >= 108200 || RUSTC_VERSION >= 108000 && UNWIND_PATCH_PAC_INTO_SCS + config CLANG_SUPPORTS_DYNAMIC_FTRACE_WITH_ARGS def_bool CC_IS_CLANG # https://github.com/ClangBuiltLinux/linux/issues/1507 diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index f6bc3da1ef11..b058c4803efb 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -57,9 +57,11 @@ KBUILD_AFLAGS += $(call cc-option,-mabi=lp64) ifneq ($(CONFIG_UNWIND_TABLES),y) KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables KBUILD_AFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables +KBUILD_RUSTFLAGS += -Cforce-unwind-tables=n else KBUILD_CFLAGS += -fasynchronous-unwind-tables KBUILD_AFLAGS += -fasynchronous-unwind-tables +KBUILD_RUSTFLAGS += -Cforce-unwind-tables=y -Zuse-sync-unwind=n endif ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) @@ -114,6 +116,7 @@ endif ifeq ($(CONFIG_SHADOW_CALL_STACK), y) KBUILD_CFLAGS += -ffixed-x18 +KBUILD_RUSTFLAGS += -Zfixed-x18 endif ifeq ($(CONFIG_CPU_BIG_ENDIAN), y) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index b6d515db869b..22dc5ea4196c 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -177,7 +177,7 @@ config RISCV select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_RETHOOK if !XIP_KERNEL select HAVE_RSEQ - select HAVE_RUST if 64BIT + select HAVE_RUST if RUSTC_SUPPORTS_RISCV select HAVE_SAMPLE_FTRACE_DIRECT select HAVE_SAMPLE_FTRACE_DIRECT_MULTI select HAVE_STACKPROTECTOR @@ -209,6 +209,13 @@ config RISCV select USER_STACKTRACE_SUPPORT select ZONE_DMA32 if 64BIT +config RUSTC_SUPPORTS_RISCV + def_bool y + depends on 64BIT + # Shadow call stack requires rustc version 1.82+ due to use of the + # -Zsanitizer=shadow-call-stack flag. + depends on !SHADOW_CALL_STACK || RUSTC_VERSION >= 108200 + config CLANG_SUPPORTS_DYNAMIC_FTRACE def_bool CC_IS_CLANG # https://github.com/ClangBuiltLinux/linux/issues/1817 diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 801fd85c3ef6..cd75e78a06c1 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -24,11 +24,15 @@ RETPOLINE_CFLAGS += $(call cc-option,-mindirect-branch-cs-prefix) ifdef CONFIG_MITIGATION_RETHUNK RETHUNK_CFLAGS := -mfunction-return=thunk-extern +RETHUNK_RUSTFLAGS := -Zfunction-return=thunk-extern RETPOLINE_CFLAGS += $(RETHUNK_CFLAGS) +RETPOLINE_RUSTFLAGS += $(RETHUNK_RUSTFLAGS) endif export RETHUNK_CFLAGS +export RETHUNK_RUSTFLAGS export RETPOLINE_CFLAGS +export RETPOLINE_RUSTFLAGS export RETPOLINE_VDSO_CFLAGS # For gcc stack alignment is specified with -mpreferred-stack-boundary, @@ -218,9 +222,10 @@ KBUILD_CFLAGS += -fno-asynchronous-unwind-tables # Avoid indirect branches in kernel to deal with Spectre ifdef CONFIG_MITIGATION_RETPOLINE KBUILD_CFLAGS += $(RETPOLINE_CFLAGS) + KBUILD_RUSTFLAGS += $(RETPOLINE_RUSTFLAGS) # Additionally, avoid generating expensive indirect jumps which # are subject to retpolines for small number of switch cases. - # clang turns off jump table generation by default when under + # LLVM turns off jump table generation by default when under # retpoline builds, however, gcc does not for x86. This has # only been fixed starting from gcc stable version 8.4.0 and # onwards, but not for older ones. See gcc bug #86952. @@ -237,6 +242,10 @@ ifdef CONFIG_CALL_PADDING PADDING_CFLAGS := -fpatchable-function-entry=$(CONFIG_FUNCTION_PADDING_BYTES),$(CONFIG_FUNCTION_PADDING_BYTES) KBUILD_CFLAGS += $(PADDING_CFLAGS) export PADDING_CFLAGS + +PADDING_RUSTFLAGS := -Zpatchable-function-entry=$(CONFIG_FUNCTION_PADDING_BYTES),$(CONFIG_FUNCTION_PADDING_BYTES) +KBUILD_RUSTFLAGS += $(PADDING_RUSTFLAGS) +export PADDING_RUSTFLAGS endif KBUILD_LDFLAGS += -m elf_$(UTS_MACHINE) |