linux-kernel - [PATCH AUTOSEL 6.6 20/40] LoongArch: Silence the boot warning about 'nokaslr'

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Message-ID: <20231128210615.875085-20-sashal@kernel.org>
Date:   Tue, 28 Nov 2023 16:05:26 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Huacai Chen <chenhuacai@...ngson.cn>,
        Sasha Levin <sashal@...nel.org>, chenhuacai@...nel.org,
        tangyouling@...ngson.cn, xry111@...111.site, wangrui@...ngson.cn,
        zhangqing@...ngson.cn, loongarch@...ts.linux.dev
Subject: [PATCH AUTOSEL 6.6 20/40] LoongArch: Silence the boot warning about 'nokaslr'

From: Huacai Chen <chenhuacai@...ngson.cn>

[ Upstream commit 902d75cdf0cf0a3fb58550089ee519abf12566f5 ]

The kernel parameter 'nokaslr' is handled before start_kernel(), so we
don't need early_param() to mark it technically. But it can cause a boot
warning as follows:

Unknown kernel command line parameters "nokaslr", will be passed to user space.

When we use 'init=/bin/bash', 'nokaslr' which passed to user space will
even cause a kernel panic. So we use early_param() to mark 'nokaslr',
simply print a notice and silence the boot warning (also fix a potential
panic). This logic is similar to RISC-V.

Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/loongarch/kernel/relocate.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/loongarch/kernel/relocate.c b/arch/loongarch/kernel/relocate.c
index 288b739ca88dd..1acfa704c8d09 100644
--- a/arch/loongarch/kernel/relocate.c
+++ b/arch/loongarch/kernel/relocate.c
@@ -102,6 +102,14 @@ static inline __init unsigned long get_random_boot(void)
 	return hash;
 }
 
+static int __init nokaslr(char *p)
+{
+	pr_info("KASLR is disabled.\n");
+
+	return 0; /* Print a notice and silence the boot warning */
+}
+early_param("nokaslr", nokaslr);
+
 static inline __init bool kaslr_disabled(void)
 {
 	char *str;
-- 
2.42.0