From: Kees Cook <kees@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Kees Cook <kees@kernel.org>,
Nathan Chancellor <nathan@kernel.org>,
Vegard Nossum <vegard.nossum@oracle.com>,
Miguel Ojeda <ojeda@kernel.org>,
Linus Walleij <linus.walleij@linaro.org>,
Jeff Johnson <jeff.johnson@oss.qualcomm.com>,
Randy Dunlap <rdunlap@infradead.org>,
David Woodhouse <dwmw2@infradead.org>,
"Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>,
Nick Desaulniers <nick.desaulniers+lkml@gmail.com>,
Bill Wendling <morbo@google.com>,
Justin Stitt <justinstitt@google.com>,
Marco Elver <elver@google.com>,
Przemek Kitszel <przemyslaw.kitszel@intel.com>,
Ramon de C Valle <rcvalle@google.com>,
Jonathan Corbet <corbet@lwn.net>,
"Paul E. McKenney" <paulmck@kernel.org>,
Nicolas Schier <nicolas.schier@linux.dev>,
Masahiro Yamada <masahiroy@kernel.org>,
Arnd Bergmann <arnd@arndb.de>,
Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
Sami Tolvanen <samitolvanen@google.com>,
Mark Rutland <mark.rutland@arm.com>,
linux-kernel@vger.kernel.org, llvm@lists.linux.dev,
linux-doc@vger.kernel.org, linux-kbuild@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, x86@kernel.org,
linux-hardening@vger.kernel.org
Subject: [PATCH v2 4/9] x86/cfi: Standardize on common "CFI:" prefix for CFI reports
Date: Wed, 3 Sep 2025 20:46:43 -0700 [thread overview]
Message-ID: <20250904034656.3670313-4-kees@kernel.org> (raw)
In-Reply-To: <20250904033217.it.414-kees@kernel.org>
Use a regular "CFI:" prefix for CFI reports during alternatives setup,
including reporting when nothing has happened (i.e. CONFIG_FINEIBT=n).
Signed-off-by: Kees Cook <kees@kernel.org>
---
Cc: Peter Zijlstra <peterz@infradead.org>
---
arch/x86/kernel/alternative.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 7bde68247b5f..d8f4ac95b4df 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -1266,26 +1266,26 @@ static __init int cfi_parse_cmdline(char *str)
} else if (!strcmp(str, "norand")) {
cfi_rand = false;
} else if (!strcmp(str, "warn")) {
- pr_alert("CFI mismatch non-fatal!\n");
+ pr_alert("CFI: mismatch non-fatal!\n");
cfi_warn = true;
} else if (!strcmp(str, "paranoid")) {
if (cfi_mode == CFI_FINEIBT) {
cfi_paranoid = true;
} else {
- pr_err("Ignoring paranoid; depends on fineibt.\n");
+ pr_err("CFI: ignoring paranoid; depends on fineibt.\n");
}
} else if (!strcmp(str, "bhi")) {
#ifdef CONFIG_FINEIBT_BHI
if (cfi_mode == CFI_FINEIBT) {
cfi_bhi = true;
} else {
- pr_err("Ignoring bhi; depends on fineibt.\n");
+ pr_err("CFI: ignoring bhi; depends on fineibt.\n");
}
#else
- pr_err("Ignoring bhi; depends on FINEIBT_BHI=y.\n");
+ pr_err("CFI: ignoring bhi; depends on FINEIBT_BHI=y.\n");
#endif
} else {
- pr_err("Ignoring unknown cfi option (%s).", str);
+ pr_err("CFI: Ignoring unknown option (%s).", str);
}
str = next;
@@ -1757,7 +1757,7 @@ static void __apply_fineibt(s32 *start_retpoline, s32 *end_retpoline,
switch (cfi_mode) {
case CFI_OFF:
if (builtin)
- pr_info("Disabling CFI\n");
+ pr_info("CFI: disabled\n");
return;
case CFI_KCFI:
@@ -1766,7 +1766,8 @@ static void __apply_fineibt(s32 *start_retpoline, s32 *end_retpoline,
goto err;
if (builtin)
- pr_info("Using kCFI\n");
+ pr_info("CFI: Using %sretpoline kCFI\n",
+ cfi_rand ? "rehashed " : "");
return;
case CFI_FINEIBT:
@@ -2005,6 +2006,8 @@ bool decode_fineibt_insn(struct pt_regs *regs, unsigned long *target, u32 *type)
static void __apply_fineibt(s32 *start_retpoline, s32 *end_retpoline,
s32 *start_cfi, s32 *end_cfi, bool builtin)
{
+ if (IS_ENABLED(CONFIG_CFI) && builtin)
+ pr_info("CFI: Using standard kCFI\n");
}
#ifdef CONFIG_X86_KERNEL_IBT
--
2.34.1
next prev parent reply other threads:[~2025-09-04 3:58 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-04 3:46 [PATCH v2 0/9] kcfi: Prepare for GCC support Kees Cook
2025-09-04 3:46 ` [PATCH v2 1/9] compiler_types.h: Move __nocfi out of compiler-specific header Kees Cook
2025-09-04 18:28 ` Nathan Chancellor
2025-09-04 3:46 ` [PATCH v2 2/9] x86/traps: Clarify KCFI instruction layout Kees Cook
2025-09-04 3:46 ` [PATCH v2 3/9] x86/cfi: Document the "cfi=" bootparam options Kees Cook
2025-09-04 18:32 ` Nathan Chancellor
2025-09-04 3:46 ` Kees Cook [this message]
2025-09-04 18:40 ` [PATCH v2 4/9] x86/cfi: Standardize on common "CFI:" prefix for CFI reports Nathan Chancellor
2025-09-05 0:40 ` Kees Cook
2025-09-04 3:46 ` [PATCH v2 5/9] x86/cfi: Add "debug" option to "cfi=" bootparam Kees Cook
2025-09-04 7:00 ` Peter Zijlstra
2025-09-04 3:46 ` [PATCH v2 6/9] x86/cfi: Remove __noinitretpoline and __noretpoline Kees Cook
2025-09-04 3:46 ` [PATCH v2 7/9] kconfig: Add transitional symbol attribute for migration support Kees Cook
2025-09-04 3:46 ` [PATCH v2 8/9] kcfi: Rename CONFIG_CFI_CLANG to CONFIG_CFI Kees Cook
2025-09-04 3:46 ` [PATCH v2 9/9] ARM: traps: Implement KCFI trap handler for ARM32 Kees Cook
2025-09-04 7:04 ` [PATCH v2 0/9] kcfi: Prepare for GCC support Peter Zijlstra
2025-09-04 16:37 ` Kees Cook
2025-09-04 20:01 ` Peter Zijlstra
2025-09-05 0:42 ` Kees Cook
2025-09-05 7:44 ` Miguel Ojeda
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