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x86/bugs: Rename CONFIG_RETHUNK => CONFIG_MITIGATION_RETHUNK

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Step 10/10 of the namespace unification of CPU mitigations related Kconfig options.

[ mingo: Added one more case. ]

Suggested-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20231121160740.1249350-11-leitao@debian.org
This commit is contained in:
Breno Leitao 2023-11-21 08:07:37 -08:00 committed by Ingo Molnar
parent a033eec9a0
commit 0911b8c52c
13 changed files with 20 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/x86/Kconfig
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@ -2462,7 +2462,7 @@ config FINEIBT
config HAVE_CALL_THUNKS
def_bool y
depends on CC_HAS_ENTRY_PADDING && RETHUNK && OBJTOOL
depends on CC_HAS_ENTRY_PADDING && MITIGATION_RETHUNK && OBJTOOL
config CALL_THUNKS
def_bool n
@ -2505,7 +2505,7 @@ config MITIGATION_RETPOLINE
branches. Requires a compiler with -mindirect-branch=thunk-extern
support for full protection. The kernel may run slower.
config RETHUNK
config MITIGATION_RETHUNK
bool "Enable return-thunks"
depends on MITIGATION_RETPOLINE && CC_HAS_RETURN_THUNK
select OBJTOOL if HAVE_OBJTOOL
@ -2518,7 +2518,7 @@ config RETHUNK
config MITIGATION_UNRET_ENTRY
bool "Enable UNRET on kernel entry"
depends on CPU_SUP_AMD && RETHUNK && X86_64
depends on CPU_SUP_AMD && MITIGATION_RETHUNK && X86_64
default y
help
Compile the kernel with support for the retbleed=unret mitigation.
@ -2572,7 +2572,7 @@ config MITIGATION_IBRS_ENTRY
config MITIGATION_SRSO
bool "Mitigate speculative RAS overflow on AMD"
depends on CPU_SUP_AMD && X86_64 && RETHUNK
depends on CPU_SUP_AMD && X86_64 && MITIGATION_RETHUNK
default y
help
Enable the SRSO mitigation needed on AMD Zen1-4 machines.

2
arch/x86/Makefile
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@ -22,7 +22,7 @@ RETPOLINE_VDSO_CFLAGS := -mretpoline
endif
RETPOLINE_CFLAGS += $(call cc-option,-mindirect-branch-cs-prefix)
ifdef CONFIG_RETHUNK
ifdef CONFIG_MITIGATION_RETHUNK
RETHUNK_CFLAGS := -mfunction-return=thunk-extern
RETPOLINE_CFLAGS += $(RETHUNK_CFLAGS)
endif

2
arch/x86/configs/i386_defconfig
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@ -42,7 +42,7 @@ CONFIG_EFI_STUB=y
CONFIG_HZ_1000=y
CONFIG_KEXEC=y
CONFIG_CRASH_DUMP=y
# CONFIG_RETHUNK is not set
# CONFIG_MITIGATION_RETHUNK is not set
CONFIG_HIBERNATION=y
CONFIG_PM_DEBUG=y
CONFIG_PM_TRACE_RTC=y

2
arch/x86/include/asm/disabled-features.h
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@ -57,7 +57,7 @@
(1 << (X86_FEATURE_RETPOLINE_LFENCE & 31)))
#endif
#ifdef CONFIG_RETHUNK
#ifdef CONFIG_MITIGATION_RETHUNK
# define DISABLE_RETHUNK 0
#else
# define DISABLE_RETHUNK (1 << (X86_FEATURE_RETHUNK & 31))

4
arch/x86/include/asm/linkage.h
View File

@ -40,7 +40,7 @@
#ifdef __ASSEMBLY__
#if defined(CONFIG_RETHUNK) && !defined(__DISABLE_EXPORTS) && !defined(BUILD_VDSO)
#if defined(CONFIG_MITIGATION_RETHUNK) && !defined(__DISABLE_EXPORTS) && !defined(BUILD_VDSO)
#define RET jmp __x86_return_thunk
#else /* CONFIG_MITIGATION_RETPOLINE */
#ifdef CONFIG_MITIGATION_SLS
@ -52,7 +52,7 @@
#else /* __ASSEMBLY__ */
#if defined(CONFIG_RETHUNK) && !defined(__DISABLE_EXPORTS) && !defined(BUILD_VDSO)
#if defined(CONFIG_MITIGATION_RETHUNK) && !defined(__DISABLE_EXPORTS) && !defined(BUILD_VDSO)
#define ASM_RET "jmp __x86_return_thunk\n\t"
#else /* CONFIG_MITIGATION_RETPOLINE */
#ifdef CONFIG_MITIGATION_SLS

4
arch/x86/include/asm/nospec-branch.h
View File

@ -289,7 +289,7 @@
* where we have a stack but before any RET instruction.
*/
.macro __UNTRAIN_RET ibpb_feature, call_depth_insns
#if defined(CONFIG_RETHUNK) || defined(CONFIG_MITIGATION_IBPB_ENTRY)
#if defined(CONFIG_MITIGATION_RETHUNK) || defined(CONFIG_MITIGATION_IBPB_ENTRY)
VALIDATE_UNRET_END
ALTERNATIVE_3 "", \
CALL_UNTRAIN_RET, X86_FEATURE_UNRET, \
@ -328,7 +328,7 @@ extern retpoline_thunk_t __x86_indirect_thunk_array[];
extern retpoline_thunk_t __x86_indirect_call_thunk_array[];
extern retpoline_thunk_t __x86_indirect_jump_thunk_array[];
#ifdef CONFIG_RETHUNK
#ifdef CONFIG_MITIGATION_RETHUNK
extern void __x86_return_thunk(void);
#else
static inline void __x86_return_thunk(void) {}

2
arch/x86/include/asm/static_call.h
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@ -46,7 +46,7 @@
#define ARCH_DEFINE_STATIC_CALL_TRAMP(name, func) \
__ARCH_DEFINE_STATIC_CALL_TRAMP(name, ".byte 0xe9; .long " #func " - (. + 4)")
#ifdef CONFIG_RETHUNK
#ifdef CONFIG_MITIGATION_RETHUNK
#define ARCH_DEFINE_STATIC_CALL_NULL_TRAMP(name) \
__ARCH_DEFINE_STATIC_CALL_TRAMP(name, "jmp __x86_return_thunk")
#else

4
arch/x86/kernel/alternative.c
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@ -769,7 +769,7 @@ void __init_or_module noinline apply_retpolines(s32 *start, s32 *end)
}
}
#ifdef CONFIG_RETHUNK
#ifdef CONFIG_MITIGATION_RETHUNK
/*
* Rewrite the compiler generated return thunk tail-calls.
@ -842,7 +842,7 @@ void __init_or_module noinline apply_returns(s32 *start, s32 *end)
}
#else
void __init_or_module noinline apply_returns(s32 *start, s32 *end) { }
#endif /* CONFIG_RETHUNK */
#endif /* CONFIG_MITIGATION_RETHUNK */
#else /* !CONFIG_MITIGATION_RETPOLINE || !CONFIG_OBJTOOL */

2
arch/x86/kernel/static_call.c
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@ -172,7 +172,7 @@ void arch_static_call_transform(void *site, void *tramp, void *func, bool tail)
}
EXPORT_SYMBOL_GPL(arch_static_call_transform);
#ifdef CONFIG_RETHUNK
#ifdef CONFIG_MITIGATION_RETHUNK
/*
* This is called by apply_returns() to fix up static call trampolines,
* specifically ARCH_DEFINE_STATIC_CALL_NULL_TRAMP which is recorded as

4
arch/x86/lib/retpoline.S
View File

@ -127,7 +127,7 @@ SYM_CODE_END(__x86_indirect_jump_thunk_array)
#undef GEN
#endif
#ifdef CONFIG_RETHUNK
#ifdef CONFIG_MITIGATION_RETHUNK
/*
* Be careful here: that label cannot really be removed because in
@ -386,4 +386,4 @@ SYM_CODE_START(__x86_return_thunk)
SYM_CODE_END(__x86_return_thunk)
EXPORT_SYMBOL(__x86_return_thunk)
#endif /* CONFIG_RETHUNK */
#endif /* CONFIG_MITIGATION_RETHUNK */

2
scripts/Makefile.lib
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@ -263,7 +263,7 @@ objtool-args-$(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT) += --mnop
endif
objtool-args-$(CONFIG_UNWINDER_ORC) += --orc
objtool-args-$(CONFIG_MITIGATION_RETPOLINE) += --retpoline
objtool-args-$(CONFIG_RETHUNK) += --rethunk
objtool-args-$(CONFIG_MITIGATION_RETHUNK) += --rethunk
objtool-args-$(CONFIG_MITIGATION_SLS) += --sls
objtool-args-$(CONFIG_STACK_VALIDATION) += --stackval
objtool-args-$(CONFIG_HAVE_STATIC_CALL_INLINE) += --static-call

2
tools/arch/x86/include/asm/disabled-features.h
View File

@ -57,7 +57,7 @@
(1 << (X86_FEATURE_RETPOLINE_LFENCE & 31)))
#endif
#ifdef CONFIG_RETHUNK
#ifdef CONFIG_MITIGATION_RETHUNK
# define DISABLE_RETHUNK 0
#else
# define DISABLE_RETHUNK (1 << (X86_FEATURE_RETHUNK & 31))

2
tools/objtool/check.c
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@ -3980,7 +3980,7 @@ static int validate_retpoline(struct objtool_file *file)
if (insn->type == INSN_RETURN) {
if (opts.rethunk) {
WARN_INSN(insn, "'naked' return found in RETHUNK build");
WARN_INSN(insn, "'naked' return found in MITIGATION_RETHUNK build");
} else
continue;
} else {