linux-kernel - [PATCH] LoongArch: Fix arch_dup_task_struct() for CONFIG

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Message-ID: <20251126043815.1482382-1-chenhuacai@loongson.cn>
Date: Wed, 26 Nov 2025 12:38:15 +0800
From: Huacai Chen <chenhuacai@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: loongarch@...ts.linux.dev,
	Xuefeng Li <lixuefeng@...ngson.cn>,
	Guo Ren <guoren@...nel.org>,
	Xuerui Wang <kernel@...0n.name>,
	Jiaxun Yang <jiaxun.yang@...goat.com>,
	linux-kernel@...r.kernel.org,
	Huacai Chen <chenhuacai@...ngson.cn>,
	stable@...r.kernel.org
Subject: [PATCH] LoongArch: Fix arch_dup_task_struct() for CONFIG_RANDSTRUCT

Now the optimized version of arch_dup_task_struct() for LoongArch
assumes 'thread' is the last member of 'task_struct'. But this is
not true if CONFIG_RANDSTRUCT is enabled after Linux-6.16.

So fix the arch_dup_task_struct() function for CONFIG_RANDSTRUCT by
copying the whole 'task_struct'.

Cc: stable@...r.kernel.org
Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
---
 arch/loongarch/kernel/process.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/loongarch/kernel/process.c b/arch/loongarch/kernel/process.c
index efd9edf65603..d1e04f9e0f79 100644
--- a/arch/loongarch/kernel/process.c
+++ b/arch/loongarch/kernel/process.c
@@ -130,6 +130,11 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
 
 	preempt_enable();
 
+	if (IS_ENABLED(CONFIG_RANDSTRUCT)) {
+		memcpy(dst, src, sizeof(struct task_struct));
+		return 0;
+	}
+
 	if (!used_math())
 		memcpy(dst, src, offsetof(struct task_struct, thread.fpu.fpr));
 	else
-- 
2.47.3