add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/net/netdevsim/dev.c
..
..
@@ -149,13 +149,10 @@
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 	cookie_len = (count - 1) / 2;
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 	if ((count - 1) % 2)
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 		return -EINVAL;
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-	buf = kmalloc(count, GFP_KERNEL | __GFP_NOWARN);
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-	if (!buf)
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-		return -ENOMEM;
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-	ret = simple_write_to_buffer(buf, count, ppos, data, count);
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-	if (ret < 0)
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-		goto free_buf;
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+	buf = memdup_user(data, count);
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+	if (IS_ERR(buf))
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+		return PTR_ERR(buf);
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 	fa_cookie = kmalloc(sizeof(*fa_cookie) + cookie_len,
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 			    GFP_KERNEL | __GFP_NOWARN);