add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/nios2/kernel/sys_nios2.c
..
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@@ -22,6 +22,7 @@
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 				unsigned int op)
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 {
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 	struct vm_area_struct *vma;
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+	struct mm_struct *mm = current->mm;
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 	if (len == 0)
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 		return 0;
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@@ -34,16 +35,22 @@
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 	if (addr + len < addr)
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 		return -EFAULT;
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+	if (mmap_read_lock_killable(mm))
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+		return -EINTR;
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+
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 	/*
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 	 * Verify that the specified address region actually belongs
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 	 * to this process.
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 	 */
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-	vma = find_vma(current->mm, addr);
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-	if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end)
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+	vma = find_vma(mm, addr);
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+	if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) {
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+		mmap_read_unlock(mm);
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 		return -EFAULT;
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+	}
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 	flush_cache_range(vma, addr, addr + len);
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+	mmap_read_unlock(mm);
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 	return 0;
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 }
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