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 Signed-off-by: Huacai Chen chenhuacai@loongson.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