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* [PATCH] x86/alternatives: Guard NOPs optimization
@ 2015-04-04 21:07 Borislav Petkov
  2015-04-07  9:41 ` [tip:x86/asm] " tip-bot for Borislav Petkov
  0 siblings, 1 reply; 2+ messages in thread
From: Borislav Petkov @ 2015-04-04 21:07 UTC (permalink / raw)
  To: Ingo Molnar; +Cc: X86 ML, LKML

From: Borislav Petkov <bp@suse.de>

Take a look at the first insn byte before optimizing the NOP -
there might be something else already, like the ALTERNATIVE_2() in
rdtsc_barrier() which nops out on AMD even though we just patched in an
MFENCE.

This happens because the alternatives sees X86_FEATURE_MFENCE_RDTSC,
AMD CPUs set it, we patch in the MFENCE and right afterwards it sees
X86_FEATURE_LFENCE_RDTSC which AMD CPUs don't set and we blindly
optimize the NOP.

Checking whether at least the first byte is 0x90 prevents that.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/kernel/alternative.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 7c4ad005d7a0..aef653193160 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -325,6 +325,9 @@ done:
 
 static void __init_or_module optimize_nops(struct alt_instr *a, u8 *instr)
 {
+	if (instr[0] != 0x90)
+		return;
+
 	add_nops(instr + (a->instrlen - a->padlen), a->padlen);
 
 	DUMP_BYTES(instr, a->instrlen, "%p: [%d:%d) optimized NOPs: ",
-- 
2.3.3


^ permalink raw reply	[flat|nested] 2+ messages in thread

* [tip:x86/asm] x86/alternatives: Guard NOPs optimization
  2015-04-04 21:07 [PATCH] x86/alternatives: Guard NOPs optimization Borislav Petkov
@ 2015-04-07  9:41 ` " tip-bot for Borislav Petkov
  0 siblings, 0 replies; 2+ messages in thread
From: tip-bot for Borislav Petkov @ 2015-04-07  9:41 UTC (permalink / raw)
  To: linux-tip-commits
  Cc: torvalds, tglx, hpa, dvlasenk, luto, bp, mingo, brgerst,
	linux-kernel, bp

Commit-ID:  69df353ff305805fc16082d0c5bfa6e20fa8b863
Gitweb:     http://git.kernel.org/tip/69df353ff305805fc16082d0c5bfa6e20fa8b863
Author:     Borislav Petkov <bp@suse.de>
AuthorDate: Sat, 4 Apr 2015 23:07:42 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 6 Apr 2015 09:24:09 +0200

x86/alternatives: Guard NOPs optimization

Take a look at the first instruction byte before optimizing the NOP -
there might be something else there already, like the ALTERNATIVE_2()
in rdtsc_barrier() which NOPs out on AMD even though we just
patched in an MFENCE.

This happens because the alternatives sees X86_FEATURE_MFENCE_RDTSC,
AMD CPUs set it, we patch in the MFENCE and right afterwards it sees
X86_FEATURE_LFENCE_RDTSC which AMD CPUs don't set and we blindly
optimize the NOP.

Checking whether at least the first byte is 0x90 prevents that.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1428181662-18020-1-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/alternative.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 7c4ad00..aef6531 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -325,6 +325,9 @@ done:
 
 static void __init_or_module optimize_nops(struct alt_instr *a, u8 *instr)
 {
+	if (instr[0] != 0x90)
+		return;
+
 	add_nops(instr + (a->instrlen - a->padlen), a->padlen);
 
 	DUMP_BYTES(instr, a->instrlen, "%p: [%d:%d) optimized NOPs: ",

^ permalink raw reply	[flat|nested] 2+ messages in thread

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2015-04-04 21:07 [PATCH] x86/alternatives: Guard NOPs optimization Borislav Petkov
2015-04-07  9:41 ` [tip:x86/asm] " tip-bot for Borislav Petkov

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