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

Sasha Levin
2023-11-28T21:08:08Z

From: Huacai Chen <chenhuacai@loongson.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@loongson.cn>
Signed-off-by: Sasha Levin <sashal@kernel.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