linux-kernel - [RFC PATCH v4 20/37] arm64: Set intra-function call annotations

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Message-ID: <20220429094355.122389-21-chenzhongjin@huawei.com>
Date:   Fri, 29 Apr 2022 17:43:38 +0800
From:   Chen Zhongjin <chenzhongjin@...wei.com>
To:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-arch@...r.kernel.org>
CC:     <jthierry@...hat.com>, <catalin.marinas@....com>,
        <will@...nel.org>, <masahiroy@...nel.org>, <jpoimboe@...hat.com>,
        <peterz@...radead.org>, <ycote@...hat.com>,
        <herbert@...dor.apana.org.au>, <mark.rutland@....com>,
        <davem@...emloft.net>, <ardb@...nel.org>, <maz@...nel.org>,
        <tglx@...utronix.de>, <luc.vanoostenryck@...il.com>,
        <chenzhongjin@...wei.com>
Subject: [RFC PATCH v4 20/37] arm64: Set intra-function call annotations

From: Julien Thierry <jthierry@...hat.com>

Stack validation requires BL instructions to an address,
within the symbol containing the BL should be annotated as intra-function
calls.

Make __pmull_p8_core normally set frame because there's a intra-function
call destinating middle of it and the caller have set the frame. When
analyzing the insns there will be a cfi state mismatch between normal-call
and intra-call.

Signed-off-by: Julien Thierry <jthierry@...hat.com>
Signed-off-by: Chen Zhongjin <chenzhongjin@...wei.com>
---
 arch/arm64/crypto/crct10dif-ce-core.S | 5 +++++
 arch/arm64/kernel/entry.S             | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/arch/arm64/crypto/crct10dif-ce-core.S b/arch/arm64/crypto/crct10dif-ce-core.S
index dce6dcebfca1..a1b10d2fb06d 100644
--- a/arch/arm64/crypto/crct10dif-ce-core.S
+++ b/arch/arm64/crypto/crct10dif-ce-core.S
@@ -63,6 +63,7 @@
 //
 
 #include <linux/linkage.h>
+#include <linux/objtool.h>
 #include <asm/assembler.h>
 
 	.text
@@ -132,6 +133,8 @@
 	.endm
 
 SYM_FUNC_START_LOCAL(__pmull_p8_core)
+	stp		x29, x30, [sp, #-16]!
+	mov		x29, sp
 .L__pmull_p8_core:
 	ext		t4.8b, ad.8b, ad.8b, #1			// A1
 	ext		t5.8b, ad.8b, ad.8b, #2			// A2
@@ -193,6 +196,7 @@ SYM_FUNC_START_LOCAL(__pmull_p8_core)
 
 	eor		t4.16b, t4.16b, t5.16b
 	eor		t6.16b, t6.16b, t3.16b
+	ldp		x29, x30, [sp], #16
 	ret
 SYM_FUNC_END(__pmull_p8_core)
 
@@ -207,6 +211,7 @@ SYM_FUNC_END(__pmull_p8_core)
 	pmull2		\rq\().8h, \ad\().16b, \bd\().16b	// D = A*B
 	.endif
 
+	ANNOTATE_INTRA_FUNCTION_CALL
 	bl		.L__pmull_p8_core\i
 
 	eor		\rq\().16b, \rq\().16b, t4.16b
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index ede028dee81b..47829a3077be 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -10,6 +10,7 @@
 #include <linux/arm-smccc.h>
 #include <linux/init.h>
 #include <linux/linkage.h>
+#include <linux/objtool.h>
 
 #include <asm/alternative.h>
 #include <asm/assembler.h>
@@ -682,6 +683,7 @@ alternative_else_nop_endif
 	 * entry onto the return stack and using a RET instruction to
 	 * enter the full-fat kernel vectors.
 	 */
+	ANNOTATE_INTRA_FUNCTION_CALL
 	bl	2f
 	b	.
 2:
-- 
2.17.1