linux-kernel - [tip:x86/pti] x86/speculation, objtool: Annotate indirect calls/jumps for objtool on 32-bit kernels

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Date:   Wed, 14 Mar 2018 05:28:01 -0700
From:   tip-bot for Andy Whitcroft <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, dave.hansen@...ux.intel.com, arjan@...ux.intel.com,
        mingo@...nel.org, dwmw@...zon.co.uk, gregkh@...uxfoundation.org,
        torvalds@...ux-foundation.org, apw@...onical.com, bp@...en8.de,
        luto@...nel.org, dan.j.williams@...el.com, jpoimboe@...hat.com,
        tglx@...utronix.de, linux-kernel@...r.kernel.org,
        dwmw2@...radead.org, peterz@...radead.org
Subject: [tip:x86/pti] x86/speculation, objtool: Annotate indirect
 calls/jumps for objtool on 32-bit kernels

Commit-ID:  a14bff131108faf50cc0cf864589fd71ee216c96
Gitweb:     https://git.kernel.org/tip/a14bff131108faf50cc0cf864589fd71ee216c96
Author:     Andy Whitcroft <apw@...onical.com>
AuthorDate: Wed, 14 Mar 2018 11:24:27 +0000
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 14 Mar 2018 13:24:31 +0100

x86/speculation, objtool: Annotate indirect calls/jumps for objtool on 32-bit kernels

In the following commit:

  9e0e3c5130e9 ("x86/speculation, objtool: Annotate indirect calls/jumps for objtool")

... we added annotations for CALL_NOSPEC/JMP_NOSPEC on 64-bit x86 kernels,
but we did not annotate the 32-bit path.

Annotate it similarly.

Signed-off-by: Andy Whitcroft <apw@...onical.com>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Arjan van de Ven <arjan@...ux.intel.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: David Woodhouse <dwmw2@...radead.org>
Cc: David Woodhouse <dwmw@...zon.co.uk>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/20180314112427.22351-1-apw@canonical.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/nospec-branch.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index b7063cfa19f9..b3996d60f981 100644
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -183,7 +183,10 @@
  * otherwise we'll run out of registers. We don't care about CET
  * here, anyway.
  */
-# define CALL_NOSPEC ALTERNATIVE("call *%[thunk_target]\n",	\
+# define CALL_NOSPEC						\
+	ALTERNATIVE(						\
+	ANNOTATE_RETPOLINE_SAFE					\
+	"call *%[thunk_target]\n",				\
 	"       jmp    904f;\n"					\
 	"       .align 16\n"					\
 	"901:	call   903f;\n"					\