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LoongArch: Fix arch_dup_task_struct() for CONFIG_RANDSTRUCT

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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@vger.kernel.org   # 6.16+
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Huacai Chen 2025-12-06 10:39:48 +08:00
parent 3c250aecef
commit a91b446e35
1 changed files with 5 additions and 0 deletions
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5
arch/loongarch/kernel/process.c
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@ -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