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x86/bugs: Rename CONFIG_CPU_UNRET_ENTRY => CONFIG_MITIGATION_UNRET_ENTRY

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Step 7/10 of the namespace unification of CPU mitigations related Kconfig options.

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/20231121160740.1249350-8-leitao@debian.org
This commit is contained in:
Breno Leitao 2023-11-21 08:07:34 -08:00 committed by Ingo Molnar
parent 7b75782ffd
commit ac61d43983
10 changed files with 18 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/Kconfig
View File

@ -2516,7 +2516,7 @@ config RETHUNK
Requires a compiler with -mfunction-return=thunk-extern
support for full protection. The kernel may run slower.
config CPU_UNRET_ENTRY
config MITIGATION_UNRET_ENTRY
bool "Enable UNRET on kernel entry"
depends on CPU_SUP_AMD && RETHUNK && X86_64
default y

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

@ -63,7 +63,7 @@
# define DISABLE_RETHUNK (1 << (X86_FEATURE_RETHUNK & 31))
#endif
#ifdef CONFIG_CPU_UNRET_ENTRY
#ifdef CONFIG_MITIGATION_UNRET_ENTRY
# define DISABLE_UNRET 0
#else
# define DISABLE_UNRET (1 << (X86_FEATURE_UNRET & 31))

6
arch/x86/include/asm/nospec-branch.h
View File

@ -212,7 +212,7 @@
*/
.macro VALIDATE_UNRET_END
#if defined(CONFIG_NOINSTR_VALIDATION) && \
(defined(CONFIG_CPU_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO))
(defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO))
ANNOTATE_RETPOLINE_SAFE
nop
#endif
@ -271,7 +271,7 @@
.Lskip_rsb_\@:
.endm
#if defined(CONFIG_CPU_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO)
#if defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO)
#define CALL_UNTRAIN_RET "call entry_untrain_ret"
#else
#define CALL_UNTRAIN_RET ""
@ -334,7 +334,7 @@ extern void __x86_return_thunk(void);
static inline void __x86_return_thunk(void) {}
#endif
#ifdef CONFIG_CPU_UNRET_ENTRY
#ifdef CONFIG_MITIGATION_UNRET_ENTRY
extern void retbleed_return_thunk(void);
#else
static inline void retbleed_return_thunk(void) {}

2
arch/x86/kernel/cpu/amd.c
View File

@ -928,7 +928,7 @@ static void fix_erratum_1386(struct cpuinfo_x86 *c)
void init_spectral_chicken(struct cpuinfo_x86 *c)
{
#ifdef CONFIG_CPU_UNRET_ENTRY
#ifdef CONFIG_MITIGATION_UNRET_ENTRY
u64 value;
/*

6
arch/x86/kernel/cpu/bugs.c
View File

@ -982,10 +982,10 @@ static void __init retbleed_select_mitigation(void)
return;
case RETBLEED_CMD_UNRET:
if (IS_ENABLED(CONFIG_CPU_UNRET_ENTRY)) {
if (IS_ENABLED(CONFIG_MITIGATION_UNRET_ENTRY)) {
retbleed_mitigation = RETBLEED_MITIGATION_UNRET;
} else {
pr_err("WARNING: kernel not compiled with CPU_UNRET_ENTRY.\n");
pr_err("WARNING: kernel not compiled with MITIGATION_UNRET_ENTRY.\n");
goto do_cmd_auto;
}
break;
@ -1021,7 +1021,7 @@ do_cmd_auto:
case RETBLEED_CMD_AUTO:
if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) {
if (IS_ENABLED(CONFIG_CPU_UNRET_ENTRY))
if (IS_ENABLED(CONFIG_MITIGATION_UNRET_ENTRY))
retbleed_mitigation = RETBLEED_MITIGATION_UNRET;
else if (IS_ENABLED(CONFIG_MITIGATION_IBPB_ENTRY) &&
boot_cpu_has(X86_FEATURE_IBPB))

2
arch/x86/kernel/vmlinux.lds.S
View File

@ -504,7 +504,7 @@ INIT_PER_CPU(irq_stack_backing_store);
"fixed_percpu_data is not at start of per-cpu area");
#endif
#ifdef CONFIG_CPU_UNRET_ENTRY
#ifdef CONFIG_MITIGATION_UNRET_ENTRY
. = ASSERT((retbleed_return_thunk & 0x3f) == 0, "retbleed_return_thunk not cacheline-aligned");
#endif

10
arch/x86/lib/retpoline.S
View File

@ -230,7 +230,7 @@ SYM_CODE_END(srso_return_thunk)
#define JMP_SRSO_ALIAS_UNTRAIN_RET "ud2"
#endif /* CONFIG_CPU_SRSO */
#ifdef CONFIG_CPU_UNRET_ENTRY
#ifdef CONFIG_MITIGATION_UNRET_ENTRY
/*
* Some generic notes on the untraining sequences:
@ -312,11 +312,11 @@ SYM_CODE_END(retbleed_return_thunk)
SYM_FUNC_END(retbleed_untrain_ret)
#define JMP_RETBLEED_UNTRAIN_RET "jmp retbleed_untrain_ret"
#else /* !CONFIG_CPU_UNRET_ENTRY */
#else /* !CONFIG_MITIGATION_UNRET_ENTRY */
#define JMP_RETBLEED_UNTRAIN_RET "ud2"
#endif /* CONFIG_CPU_UNRET_ENTRY */
#endif /* CONFIG_MITIGATION_UNRET_ENTRY */
#if defined(CONFIG_CPU_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO)
#if defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO)
SYM_FUNC_START(entry_untrain_ret)
ALTERNATIVE_2 JMP_RETBLEED_UNTRAIN_RET, \
@ -325,7 +325,7 @@ SYM_FUNC_START(entry_untrain_ret)
SYM_FUNC_END(entry_untrain_ret)
__EXPORT_THUNK(entry_untrain_ret)
#endif /* CONFIG_CPU_UNRET_ENTRY || CONFIG_CPU_SRSO */
#endif /* CONFIG_MITIGATION_UNRET_ENTRY || CONFIG_CPU_SRSO */
#ifdef CONFIG_MITIGATION_CALL_DEPTH_TRACKING

2
include/linux/objtool.h
View File

@ -131,7 +131,7 @@
*/
.macro VALIDATE_UNRET_BEGIN
#if defined(CONFIG_NOINSTR_VALIDATION) && \
(defined(CONFIG_CPU_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO))
(defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO))
.Lhere_\@:
.pushsection .discard.validate_unret
.long .Lhere_\@ - .

2
scripts/Makefile.vmlinux_o
View File

@ -38,7 +38,7 @@ objtool-enabled := $(or $(delay-objtool),$(CONFIG_NOINSTR_VALIDATION))
vmlinux-objtool-args-$(delay-objtool) += $(objtool-args-y)
vmlinux-objtool-args-$(CONFIG_GCOV_KERNEL) += --no-unreachable
vmlinux-objtool-args-$(CONFIG_NOINSTR_VALIDATION) += --noinstr \
$(if $(or $(CONFIG_CPU_UNRET_ENTRY),$(CONFIG_CPU_SRSO)), --unret)
$(if $(or $(CONFIG_MITIGATION_UNRET_ENTRY),$(CONFIG_CPU_SRSO)), --unret)
objtool-args = $(vmlinux-objtool-args-y) --link

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

@ -63,7 +63,7 @@
# define DISABLE_RETHUNK (1 << (X86_FEATURE_RETHUNK & 31))
#endif
#ifdef CONFIG_CPU_UNRET_ENTRY
#ifdef CONFIG_MITIGATION_UNRET_ENTRY
# define DISABLE_UNRET 0
#else
# define DISABLE_UNRET (1 << (X86_FEATURE_UNRET & 31))