Re: xilinx_emaclite CVE -- was Re: [cip-dev] New CVE entries this week

Masami Ichikawa

Hi !

On Thu, Aug 12, 2021 at 6:52 PM Pavel Machek <pavel@...> wrote:


* CVE detail

New CVEs
CVE-2021-38205: net: xilinx_emaclite: Do not print real IOMEM pointer

xemaclite_of_probe() in drivers/net/ethernet/xilinx/xilinx_emaclite.c
leaks kernel memory layout.

Fixed status

mainline: [d0d62baa7f505bd4c59cd169692ff07ec49dde37]
stable/5.13: [8722275b41d5127048e1422a8a1b6370b4878533]
This affects our kernels (I looked at 5.10.57 and 4.4.277). On one
hand we could ask for backport, on the other... I'm not sure it is
serious enough to warrant any action.
I think this vulnerability seems to be low priority because an
attacker needs another vulnerability to abuse this vulnerability.
However, it would be nice to backport the patch too.
So I tried to apply the patch to 4.4, but it rejects, because types
changed in the meantime.

In particular eccd5403814b4e762e270ef0464bb86fb217b1bf and
18af77c50fede5b3fc22aa9f0a9b255a5c5285c9 change the printk.

It seems we are actually using the driver in one of the configs:


Patch for 4.4 should look like this:

diff --git a/drivers/net/ethernet/xilinx/xilinx_emaclite.c b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
index 909a008f9927..26cd42bfef0c 100644
--- a/drivers/net/ethernet/xilinx/xilinx_emaclite.c
+++ b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
@@ -1180,9 +1180,8 @@ static int xemaclite_of_probe(struct platform_device *ofdev)

- "Xilinx EmacLite at 0x%08X mapped to 0x%08X, irq=%d\n",
- (unsigned int __force)ndev->mem_start,
- (unsigned int __force)lp->base_addr, ndev->irq);
+ "Xilinx EmacLite at 0x%08X mapped to 0x%p, irq=%d\n",
+ (unsigned int __force)ndev->mem_start, lp->base_addr, ndev->irq);
return 0;

Thank you for your work!
This patch looks good to me.

Best regards,
DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany


Masami Ichikawa
Cybertrust Japan Co., Ltd.

Email :masami.ichikawa@...

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