AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

net: stmmac: fix memory corruption with large MTUs

Browse Source 
When using 16K DMA buffers and ring mode, the DES3 refill is not working
correctly as the function is using a bogus pointer for checking the
private data. As a result stale pointers will remain in the RX descriptor
ring, so DMA will now likely overwrite/corrupt some already freed memory.

As simple reproducer, just receive some UDP traffic:

	# ifconfig eth0 down; ifconfig eth0 mtu 9000; ifconfig eth0 up
	# iperf3 -c 192.168.253.40 -u -b 0 -R

If you didn't crash by now check the RX descriptors to find non-contiguous
RX buffers:

	cat /sys/kernel/debug/stmmaceth/eth0/descriptors_status
	[...]
	1 [0x2be5020]: 0xa3220321 0x9ffc1ffc 0x72d70082 0x130e207e
					     ^^^^^^^^^^^^^^^^^^^^^
	2 [0x2be5040]: 0xa3220321 0x9ffc1ffc 0x72998082 0x1311a07e
					     ^^^^^^^^^^^^^^^^^^^^^

A simple ping test will now report bad data:

	# ping -s 8200 192.168.253.40
	PING 192.168.253.40 (192.168.253.40) 8200(8228) bytes of data.
	8208 bytes from 192.168.253.40: icmp_seq=1 ttl=64 time=1.00 ms
	wrong data byte #8144 should be 0xd0 but was 0x88

Fix the wrong pointer. Also we must refill DES3 only if the DMA buffer
size is 16K.

Fixes: 54139cf3bb ("net: stmmac: adding multiple buffers for rx")
Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Acked-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Aaro Koskinen 2019-03-18 23:36:08 +02:00 committed by David S. Miller
parent 7442c483b9
commit 223a960c01
1 changed files with 3 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/net/ethernet/stmicro/stmmac/ring_mode.c
View File

@ -113,10 +113,11 @@ static unsigned int is_jumbo_frm(int len, int enh_desc)
static void refill_desc3(void *priv_ptr, struct dma_desc *p)
{
struct stmmac_priv *priv = (struct stmmac_priv *)priv_ptr;
struct stmmac_rx_queue *rx_q = priv_ptr;
struct stmmac_priv *priv = rx_q->priv_data;
/* Fill DES3 in case of RING mode */
if (priv->dma_buf_sz >= BUF_SIZE_8KiB)
if (priv->dma_buf_sz == BUF_SIZE_16KiB)
p->des3 = cpu_to_le32(le32_to_cpu(p->des2) + BUF_SIZE_8KiB);
}