[PATCH 3.16 54/76] x86: Introduce barrier_nospec

From: Ben Hutchings <ben@decadent.org.uk>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: akpm@linux-foundation.org, "Kees Cook" <keescook@chromium.org>,
	kernel-hardening@lists.openwall.com,
	"Al Viro" <viro@zeniv.linux.org.uk>,
	"Linus Torvalds" <torvalds@linux-foundation.org>,
	"Andi Kleen" <ak@linux.intel.com>,
	"Ingo Molnar" <mingo@redhat.com>,
	"Dan Williams" <dan.j.williams@intel.com>,
	alan@linux.intel.com, "Thomas Gleixner" <tglx@linutronix.de>,
	"Tom Lendacky" <thomas.lendacky@amd.com>,
	linux-arch@vger.kernel.org, gregkh@linuxfoundation.org
Subject: [PATCH 3.16 54/76] x86: Introduce barrier_nospec
Date: Mon, 12 Mar 2018 03:06:12 +0000	[thread overview]
Message-ID: <lsq.1520823972.926146860@decadent.org.uk> (raw)
In-Reply-To: <lsq.1520823971.5976735@decadent.org.uk>

3.16.56-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Williams <dan.j.williams@intel.com>

commit b3d7ad85b80bbc404635dca80f5b129f6242bc7a upstream.

Rename the open coded form of this instruction sequence from
rdtsc_ordered() into a generic barrier primitive, barrier_nospec().

One of the mitigations for Spectre variant1 vulnerabilities is to fence
speculative execution after successfully validating a bounds check. I.e.
force the result of a bounds check to resolve in the instruction pipeline
to ensure speculative execution honors that result before potentially
operating on out-of-bounds data.

No functional changes.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Suggested-by: Andi Kleen <ak@linux.intel.com>
Suggested-by: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arch@vger.kernel.org
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: kernel-hardening@lists.openwall.com
Cc: gregkh@linuxfoundation.org
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: alan@linux.intel.com
Link: https://lkml.kernel.org/r/151727415361.33451.9049453007262764675.stgit@dwillia2-desk3.amr.corp.intel.com
[bwh: Backported to 3.16: update rdtsc_barrier() instead of rdtsc_ordered()]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

--- a/arch/x86/include/asm/barrier.h
+++ b/arch/x86/include/asm/barrier.h
@@ -48,6 +48,10 @@ static inline unsigned long array_index_
 /* Override the default implementation from linux/nospec.h. */
 #define array_index_mask_nospec array_index_mask_nospec
 
+/* Prevent speculative execution past this barrier. */
+#define barrier_nospec() alternative_2("", "mfence", X86_FEATURE_MFENCE_RDTSC, \
+					   "lfence", X86_FEATURE_LFENCE_RDTSC)
+
 /**
  * read_barrier_depends - Flush all pending reads that subsequents reads
  * depend on.
@@ -174,8 +178,7 @@ do {									\
  */
 static __always_inline void rdtsc_barrier(void)
 {
-	alternative(ASM_NOP3, "mfence", X86_FEATURE_MFENCE_RDTSC);
-	alternative(ASM_NOP3, "lfence", X86_FEATURE_LFENCE_RDTSC);
+	barrier_nospec();
 }
 
 #endif /* _ASM_X86_BARRIER_H */
