linux-kernel - [PATCH v5 31/33] arm64: kernel: Skip validation of proton-pack.c

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Date:   Wed, 22 Jun 2022 23:49:18 +0800
From:   Chen Zhongjin <chenzhongjin@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-arch@...r.kernel.org>,
        <linuxppc-dev@...ts.ozlabs.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kbuild@...r.kernel.org>, <live-patching@...r.kernel.org>
CC:     <jpoimboe@...nel.org>, <peterz@...radead.org>,
        <catalin.marinas@....com>, <will@...nel.org>,
        <masahiroy@...nel.org>, <michal.lkml@...kovi.net>,
        <ndesaulniers@...gle.com>, <mark.rutland@....com>,
        <pasha.tatashin@...een.com>, <broonie@...nel.org>,
        <chenzhongjin@...wei.com>, <rmk+kernel@...linux.org.uk>,
        <madvenka@...ux.microsoft.com>, <christophe.leroy@...roup.eu>
Subject: [PATCH v5 31/33] arm64: kernel: Skip validation of proton-pack.c

qcom_link_stack_sanitisation() repeatly calls itself, but we can't
mark the asm code as intra-call so it should be marked as non_standard.

Signed-off-by: Julien Thierry <jthierry@...hat.com>
Signed-off-by: Chen Zhongjin <chenzhongjin@...wei.com>
---
 arch/arm64/kernel/proton-pack.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/kernel/proton-pack.c b/arch/arm64/kernel/proton-pack.c
index 40be3a7c2c53..9439e62d4b57 100644
--- a/arch/arm64/kernel/proton-pack.c
+++ b/arch/arm64/kernel/proton-pack.c
@@ -22,6 +22,7 @@
 #include <linux/cpu.h>
 #include <linux/device.h>
 #include <linux/nospec.h>
+#include <linux/objtool.h>
 #include <linux/prctl.h>
 #include <linux/sched/task_stack.h>
 
@@ -257,6 +258,7 @@ static noinstr void qcom_link_stack_sanitisation(void)
 		     "mov	x30, %0		\n"
 		     : "=&r" (tmp));
 }
+STACK_FRAME_NON_STANDARD(qcom_link_stack_sanitisation);
 
 static bp_hardening_cb_t spectre_v2_get_sw_mitigation_cb(void)
 {
-- 
2.17.1