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Date: Thu, 30 Aug 2018 07:38:44 -0700
From: Yu-cheng Yu <yu-cheng.yu@...el.com>
To: x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org, linux-mm@...ck.org,
linux-arch@...r.kernel.org, linux-api@...r.kernel.org,
Arnd Bergmann <arnd@...db.de>,
Andy Lutomirski <luto@...capital.net>,
Balbir Singh <bsingharora@...il.com>,
Cyrill Gorcunov <gorcunov@...il.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Florian Weimer <fweimer@...hat.com>,
"H.J. Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>,
Jonathan Corbet <corbet@....net>,
Kees Cook <keescook@...omiun.org>,
Mike Kravetz <mike.kravetz@...cle.com>,
Nadav Amit <nadav.amit@...il.com>,
Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>,
Peter Zijlstra <peterz@...radead.org>,
"Ravi V. Shankar" <ravi.v.shankar@...el.com>,
Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>
Cc: Yu-cheng Yu <yu-cheng.yu@...el.com>
Subject: [RFC PATCH v3 04/24] x86/fpu/xstate: Add XSAVES system states for shadow stack
Intel Control-flow Enforcement Technology (CET) introduces the
following MSRs into the XSAVES system states.
IA32_U_CET (user-mode CET settings),
IA32_PL3_SSP (user-mode shadow stack),
IA32_PL0_SSP (kernel-mode shadow stack),
IA32_PL1_SSP (ring-1 shadow stack),
IA32_PL2_SSP (ring-2 shadow stack).
Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>
---
arch/x86/include/asm/fpu/types.h | 22 +++++++++++++++++++++
arch/x86/include/asm/fpu/xstate.h | 4 +++-
arch/x86/include/uapi/asm/processor-flags.h | 2 ++
arch/x86/kernel/fpu/xstate.c | 10 ++++++++++
4 files changed, 37 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/fpu/types.h b/arch/x86/include/asm/fpu/types.h
index 202c53918ecf..e55d51d172f1 100644
--- a/arch/x86/include/asm/fpu/types.h
+++ b/arch/x86/include/asm/fpu/types.h
@@ -114,6 +114,9 @@ enum xfeature {
XFEATURE_Hi16_ZMM,
XFEATURE_PT_UNIMPLEMENTED_SO_FAR,
XFEATURE_PKRU,
+ XFEATURE_RESERVED,
+ XFEATURE_SHSTK_USER,
+ XFEATURE_SHSTK_KERNEL,
XFEATURE_MAX,
};
@@ -128,6 +131,8 @@ enum xfeature {
#define XFEATURE_MASK_Hi16_ZMM (1 << XFEATURE_Hi16_ZMM)
#define XFEATURE_MASK_PT (1 << XFEATURE_PT_UNIMPLEMENTED_SO_FAR)
#define XFEATURE_MASK_PKRU (1 << XFEATURE_PKRU)
+#define XFEATURE_MASK_SHSTK_USER (1 << XFEATURE_SHSTK_USER)
+#define XFEATURE_MASK_SHSTK_KERNEL (1 << XFEATURE_SHSTK_KERNEL)
#define XFEATURE_MASK_FPSSE (XFEATURE_MASK_FP | XFEATURE_MASK_SSE)
#define XFEATURE_MASK_AVX512 (XFEATURE_MASK_OPMASK \
@@ -229,6 +234,23 @@ struct pkru_state {
u32 pad;
} __packed;
+/*
+ * State component 11 is Control flow Enforcement user states
+ */
+struct cet_user_state {
+ u64 u_cet; /* user control flow settings */
+ u64 user_ssp; /* user shadow stack pointer */
+} __packed;
+
+/*
+ * State component 12 is Control flow Enforcement kernel states
+ */
+struct cet_kernel_state {
+ u64 kernel_ssp; /* kernel shadow stack */
+ u64 pl1_ssp; /* ring-1 shadow stack */
+ u64 pl2_ssp; /* ring-2 shadow stack */
+} __packed;
+
struct xstate_header {
u64 xfeatures;
u64 xcomp_bv;
diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h
index a32dc5f8c963..662562cbafe9 100644
--- a/arch/x86/include/asm/fpu/xstate.h
+++ b/arch/x86/include/asm/fpu/xstate.h
@@ -31,7 +31,9 @@
XFEATURE_MASK_Hi16_ZMM | \
XFEATURE_MASK_PKRU | \
XFEATURE_MASK_BNDREGS | \
- XFEATURE_MASK_BNDCSR)
+ XFEATURE_MASK_BNDCSR | \
+ XFEATURE_MASK_SHSTK_USER | \
+ XFEATURE_MASK_SHSTK_KERNEL)
#ifdef CONFIG_X86_64
#define REX_PREFIX "0x48, "
diff --git a/arch/x86/include/uapi/asm/processor-flags.h b/arch/x86/include/uapi/asm/processor-flags.h
index bcba3c643e63..25311ec4b731 100644
--- a/arch/x86/include/uapi/asm/processor-flags.h
+++ b/arch/x86/include/uapi/asm/processor-flags.h
@@ -130,6 +130,8 @@
#define X86_CR4_SMAP _BITUL(X86_CR4_SMAP_BIT)
#define X86_CR4_PKE_BIT 22 /* enable Protection Keys support */
#define X86_CR4_PKE _BITUL(X86_CR4_PKE_BIT)
+#define X86_CR4_CET_BIT 23 /* enable Control flow Enforcement */
+#define X86_CR4_CET _BITUL(X86_CR4_CET_BIT)
/*
* x86-64 Task Priority Register, CR8
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index dd2c561c4544..91c0f665567b 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -35,6 +35,9 @@ static const char *xfeature_names[] =
"Processor Trace (unused)" ,
"Protection Keys User registers",
"unknown xstate feature" ,
+ "Control flow User registers" ,
+ "Control flow Kernel registers" ,
+ "unknown xstate feature" ,
};
static short xsave_cpuid_features[] __initdata = {
@@ -48,6 +51,9 @@ static short xsave_cpuid_features[] __initdata = {
X86_FEATURE_AVX512F,
X86_FEATURE_INTEL_PT,
X86_FEATURE_PKU,
+ 0, /* Unused */
+ X86_FEATURE_SHSTK, /* XFEATURE_SHSTK_USER */
+ X86_FEATURE_SHSTK, /* XFEATURE_SHSTK_KERNEL */
};
/*
@@ -316,6 +322,8 @@ static void __init print_xstate_features(void)
print_xstate_feature(XFEATURE_MASK_ZMM_Hi256);
print_xstate_feature(XFEATURE_MASK_Hi16_ZMM);
print_xstate_feature(XFEATURE_MASK_PKRU);
+ print_xstate_feature(XFEATURE_MASK_SHSTK_USER);
+ print_xstate_feature(XFEATURE_MASK_SHSTK_KERNEL);
}
/*
@@ -562,6 +570,8 @@ static void check_xstate_against_struct(int nr)
XCHECK_SZ(sz, nr, XFEATURE_ZMM_Hi256, struct avx_512_zmm_uppers_state);
XCHECK_SZ(sz, nr, XFEATURE_Hi16_ZMM, struct avx_512_hi16_state);
XCHECK_SZ(sz, nr, XFEATURE_PKRU, struct pkru_state);
+ XCHECK_SZ(sz, nr, XFEATURE_SHSTK_USER, struct cet_user_state);
+ XCHECK_SZ(sz, nr, XFEATURE_SHSTK_KERNEL, struct cet_kernel_state);
/*
* Make *SURE* to add any feature numbers in below if
--
2.17.1
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