linux-kernel - [RFC PATCH v4 23/37] arm64: kernel: Skip validation of sigreturn32.o

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Message-ID: <20220429094355.122389-24-chenzhongjin@huawei.com>
Date:   Fri, 29 Apr 2022 17:43:41 +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 23/37] arm64: kernel: Skip validation of sigreturn32.o

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

sigreturn32.o contains aarch32 getting copied to the VDSO for
compat user tasks.

This code shouldn't get validated by arm64 objtool.

Signed-off-by: Julien Thierry <jthierry@...hat.com>
---
 arch/arm64/kernel/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index c4f01bfe79b4..eee5eb7d782b 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -40,6 +40,9 @@ $(obj)/%.stub.o: $(obj)/%.o FORCE
 obj-$(CONFIG_COMPAT)			+= sys32.o signal32.o			\
 					   sys_compat.o
 obj-$(CONFIG_COMPAT)			+= sigreturn32.o
+ifeq ($(CONFIG_COMPAT), y)
+OBJECT_FILES_NON_STANDARD_sigreturn32.o := y
+endif
 obj-$(CONFIG_KUSER_HELPERS)		+= kuser32.o
 
 OBJECT_FILES_NON_STANDARD_kuser32.o := y
-- 
2.17.1