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Commit 1a54aa50 authored by Chun-Yi Lee's avatar Chun-Yi Lee Committed by Sasha Levin
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aoe: fix the potential use-after-free problem in aoecmd_cfg_pkts 

[ Upstream commit f98364e926626c678fb4b9004b75cacf92ff0662 ]

This patch is against CVE-2023-6270. The description of cve is:

  A flaw was found in the ATA over Ethernet (AoE) driver in the Linux
  kernel. The aoecmd_cfg_pkts() function improperly updates the refcnt on
  `struct net_device`, and a use-after-free can be triggered by racing
  between the free on the struct and the access through the `skbtxq`
  global queue. This could lead to a denial of service condition or
  potential code execution.

In aoecmd_cfg_pkts(), it always calls dev_put(ifp) when skb initial
code is finished. But the net_device ifp will still be used in
later tx()->dev_queue_xmit() in kthread. Which means that the
dev_put(ifp) should NOT be called in the success path of skb
initial code in aoecmd_cfg_pkts(). Otherwise tx() may run into
use-after-free because the net_device is freed.

This patch removed the dev_put(ifp) in the success path in
aoecmd_cfg_pkts(), and added dev_put() after skb xmit in tx().

Link: https://nvd.nist.gov/vuln/detail/CVE-2023-6270


Fixes: 7562f876 ("[NET]: Rework dev_base via list_head (v3)")
Signed-off-by: default avatarChun-Yi Lee <jlee@suse.com>
Link: https://lore.kernel.org/r/20240305082048.25526-1-jlee@suse.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 72dacc72

drivers/block/aoe/aoecmd.c

+6 −6
Original line number Diff line number Diff line
@@ -420,13 +420,16 @@ aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoeminor, struct sk_buff_head *qu 
	rcu_read_lock();

	for_each_netdev_rcu(&init_net, ifp) {

		dev_hold(ifp);

		if (!is_aoe_netif(ifp))

			goto cont;

		if (!is_aoe_netif(ifp)) {

			dev_put(ifp);

			continue;

		}



		skb = new_skb(sizeof *h + sizeof *ch);

		if (skb == NULL) {

			printk(KERN_INFO "aoe: skb alloc failure\n");

			goto cont;

			dev_put(ifp);

			continue;

		}

		skb_put(skb, sizeof *h + sizeof *ch);

		skb->dev = ifp;
@@ -441,9 +444,6 @@ aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoeminor, struct sk_buff_head *qu 
		h->major = cpu_to_be16(aoemajor);

		h->minor = aoeminor;

		h->cmd = AOECMD_CFG;



cont:

		dev_put(ifp);

	}

	rcu_read_unlock();

}

drivers/block/aoe/aoenet.c

+1 −0
Original line number Diff line number Diff line
@@ -64,6 +64,7 @@ tx(int id) __must_hold(&txlock) 
			pr_warn("aoe: packet could not be sent on %s.  %s\n",

				ifp ? ifp->name : "netif",

				"consider increasing tx_queue_len");

		dev_put(ifp);

		spin_lock_irq(&txlock);

	}

	return 0;