linux-kernel - [PATCH 5.4 18/51] x86/speculation: Change FILL_RETURN

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Message-Id: <20221005113211.104615605@linuxfoundation.org>
Date:   Wed,  5 Oct 2022 13:32:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Thadeu Lima de Souza Cascardo <cascardo@...onical.com>
Subject: [PATCH 5.4 18/51] x86/speculation: Change FILL_RETURN_BUFFER to work with objtool

From: Peter Zijlstra <peterz@...radead.org>

commit 089dd8e53126ebaf506e2dc0bf89d652c36bfc12 upstream.

Change FILL_RETURN_BUFFER so that objtool groks it and can generate
correct ORC unwind information.

 - Since ORC is alternative invariant; that is, all alternatives
   should have the same ORC entries, the __FILL_RETURN_BUFFER body
   can not be part of an alternative.

   Therefore, move it out of the alternative and keep the alternative
   as a sort of jump_label around it.

 - Use the ANNOTATE_INTRA_FUNCTION_CALL annotation to white-list
   these 'funny' call instructions to nowhere.

 - Use UNWIND_HINT_EMPTY to 'fill' the speculation traps, otherwise
   objtool will consider them unreachable.

 - Move the RSP adjustment into the loop, such that the loop has a
   deterministic stack layout.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Alexandre Chartre <alexandre.chartre@...cle.com>
Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
Link: https://lkml.kernel.org/r/20200428191700.032079304@infradead.org
[cascardo: fixup because of backport of ba6e31af2be96c4d0536f2152ed6f7b6c11bca47 ("x86/speculation: Add LFENCE to RSB fill sequence")]
[cascardo: no intra-function call validation support]
[cascardo: avoid UNWIND_HINT_EMPTY because of svm]
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...onical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/x86/include/asm/nospec-branch.h |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -4,11 +4,13 @@
 #define _ASM_X86_NOSPEC_BRANCH_H_
 
 #include <linux/static_key.h>
+#include <linux/frame.h>
 
 #include <asm/alternative.h>
 #include <asm/alternative-asm.h>
 #include <asm/cpufeatures.h>
 #include <asm/msr-index.h>
+#include <asm/unwind_hints.h>
 
 /*
  * This should be used immediately before a retpoline alternative. It tells
@@ -60,9 +62,9 @@
 	lfence;					\
 	jmp	775b;				\
 774:						\
+	add	$(BITS_PER_LONG/8) * 2, sp;	\
 	dec	reg;				\
 	jnz	771b;				\
-	add	$(BITS_PER_LONG/8) * nr, sp;	\
 	/* barrier for jnz misprediction */	\
 	lfence;
 #else
@@ -154,10 +156,8 @@
   */
 .macro FILL_RETURN_BUFFER reg:req nr:req ftr:req
 #ifdef CONFIG_RETPOLINE
-	ANNOTATE_NOSPEC_ALTERNATIVE
-	ALTERNATIVE "jmp .Lskip_rsb_\@",				\
-		__stringify(__FILL_RETURN_BUFFER(\reg,\nr,%_ASM_SP))	\
-		\ftr
+	ALTERNATIVE "jmp .Lskip_rsb_\@", "", \ftr
+	__FILL_RETURN_BUFFER(\reg,\nr,%_ASM_SP)
 .Lskip_rsb_\@:
 #endif
 .endm