From: Yu-cheng Yu <yu-cheng.yu@intel.com>
To: x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
linux-mm@kvack.org, linux-arch@vger.kernel.org,
linux-api@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
Andy Lutomirski <luto@kernel.org>,
Balbir Singh <bsingharora@gmail.com>,
Borislav Petkov <bp@alien8.de>,
Cyrill Gorcunov <gorcunov@gmail.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Eugene Syromiatnikov <esyr@redhat.com>,
Florian Weimer <fweimer@redhat.com>,
"H.J. Lu" <hjl.tools@gmail.com>, Jann Horn <jannh@google.com>,
Jonathan Corbet <corbet@lwn.net>,
Kees Cook <keescook@chromium.org>,
Mike Kravetz <mike.kravetz@oracle.com>,
Nadav Amit <nadav.amit@gmail.com>,
Oleg Nesterov <oleg@redhat.com>, Pavel Machek <pavel@ucw.cz>,
Peter Zijlstra <peterz@infradead.org>,
Randy Dunlap <rdunlap@infradead.org>,
"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
Dave Martin <Dave.Martin@arm.com>,
Weijiang Yang <weijiang.yang@intel.com>,
Pengfei Xu <pengfei.xu@intel.com>,
Haitao Huang <haitao.huang@intel.com>,
Rick P Edgecombe <rick.p.edgecombe@intel.com>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Subject: [PATCH v30 01/10] x86/cet/ibt: Add Kconfig option for Indirect Branch Tracking
Date: Mon, 30 Aug 2021 11:22:12 -0700 [thread overview]
Message-ID: <20210830182221.3535-2-yu-cheng.yu@intel.com> (raw)
In-Reply-To: <20210830182221.3535-1-yu-cheng.yu@intel.com>
Indirect Branch Tracking (IBT) provides protection against CALL-/JMP-
oriented programming attacks. It is active when the kernel has this
feature enabled, and the processor and the application support it.
When this feature is enabled, legacy non-IBT applications continue to
work, but without IBT protection.
Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
---
arch/x86/Kconfig | 19 +++++++++++++++++++
arch/x86/include/asm/disabled-features.h | 8 +++++++-
2 files changed, 26 insertions(+), 1 deletion(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 34692f02118c..b063d6d2491f 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1932,6 +1932,25 @@ config X86_SHADOW_STACK
If unsure, say N.
+config X86_IBT
+ prompt "Intel Indirect Branch Tracking"
+ def_bool n
+ depends on X86_SHADOW_STACK
+ depends on $(cc-option,-fcf-protection)
+ help
+ Indirect Branch Tracking (IBT) provides protection against
+ CALL-/JMP-oriented programming attacks. It is active when
+ the kernel has this feature enabled, and the processor and
+ the application support it. When this feature is enabled,
+ legacy non-IBT applications continue to work, but without
+ IBT protection.
+ Support for this feature is present on Tiger Lake family of
+ processors released in 2020 or later. Enabling this feature
+ increases kernel text size by 3.7 KB.
+ See Documentation/x86/intel_cet.rst for more information.
+
+ If unsure, say N.
+
config EFI
bool "EFI runtime service support"
depends on ACPI
diff --git a/arch/x86/include/asm/disabled-features.h b/arch/x86/include/asm/disabled-features.h
index b7728f7afb2b..e3a08fcd72f4 100644
--- a/arch/x86/include/asm/disabled-features.h
+++ b/arch/x86/include/asm/disabled-features.h
@@ -71,6 +71,12 @@
#define DISABLE_SHSTK (1 << (X86_FEATURE_SHSTK & 31))
#endif
+#ifdef CONFIG_X86_IBT
+#define DISABLE_IBT 0
+#else
+#define DISABLE_IBT (1 << (X86_FEATURE_IBT & 31))
+#endif
+
/*
* Make sure to add features to the correct mask
*/
@@ -93,7 +99,7 @@
#define DISABLED_MASK16 (DISABLE_PKU|DISABLE_OSPKE|DISABLE_LA57|DISABLE_UMIP| \
DISABLE_ENQCMD|DISABLE_SHSTK)
#define DISABLED_MASK17 0
-#define DISABLED_MASK18 0
+#define DISABLED_MASK18 (DISABLE_IBT)
#define DISABLED_MASK19 0
#define DISABLED_MASK_CHECK BUILD_BUG_ON_ZERO(NCAPINTS != 20)
--
2.21.0
next prev parent reply other threads:[~2021-08-30 18:23 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-30 18:22 [PATCH v30 00/10] Control-flow Enforcement: Indirect Branch Tracking Yu-cheng Yu
2021-08-30 18:22 ` Yu-cheng Yu [this message]
2021-08-30 18:22 ` [PATCH v30 02/10] x86/cet/ibt: Add user-mode Indirect Branch Tracking support Yu-cheng Yu
2021-08-30 18:22 ` [PATCH v30 03/10] x86/cet/ibt: Handle signals for Indirect Branch Tracking Yu-cheng Yu
2021-08-30 18:22 ` [PATCH v30 04/10] x86/cet/ibt: Disable IBT for ia32 Yu-cheng Yu
2021-08-30 18:22 ` [PATCH v30 05/10] x86/cet/ibt: Update ELF header parsing for Indirect Branch Tracking Yu-cheng Yu
2021-08-30 18:22 ` [PATCH v30 06/10] x86/cet/ibt: Update arch_prctl functions " Yu-cheng Yu
2021-08-30 18:22 ` [PATCH v30 07/10] x86/vdso: Insert endbr32/endbr64 to vDSO Yu-cheng Yu
2021-08-30 18:22 ` [PATCH v30 08/10] x86/vdso: Introduce ENDBR macro Yu-cheng Yu
2021-08-30 18:22 ` [PATCH v30 09/10] x86/vdso/32: Add ENDBR to __kernel_vsyscall entry point Yu-cheng Yu
2021-08-30 18:22 ` [PATCH v30 10/10] x86/vdso: Add ENDBR to __vdso_sgx_enter_enclave Yu-cheng Yu
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