lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:   Wed,  4 Mar 2020 16:51:42 +0800
From:   Xin Long <>
Cc:     Steffen Klassert <>,
        Herbert Xu <>,
        "David S. Miller" <>,
        Sabrina Dubroca <>
Subject: [PATCH ipsec] esp: remove the skb from the chain when it's enqueued in cryptd_wq

Xiumei found a panic in esp offload:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
  RIP: 0010:esp_output_done+0x101/0x160 [esp4]
  Call Trace:
   ? esp_output+0x180/0x180 [esp4]
   ? create_worker+0x1a0/0x1a0
   ? kthread_flush_work_fn+0x10/0x10

It was caused by that skb secpath is used in esp_output_done() after it's
been released elsewhere.

The tx path for esp offload is:

            aead_request_set_callback(esp_output_done) <--[1]
            crypto_aead_encrypt()  <--[2]

In [1], .callback is set, and in [2] it will trigger the worker schedule,
later on a kernel thread will call .callback(esp_output_done), as the call
trace shows.

But in validate_xmit_xfrm():

  skb_list_walk_safe(skb, skb2, nskb) {
    err = x->type_offload->xmit(x, skb2, esp_features);  [esp_xmit]

When the err is -EINPROGRESS, which means this skb2 will be enqueued and
later gets encrypted and sent out by .callback later in a kernel thread,
skb2 should be removed fromt skb chain. Otherwise, it will get processed
again outside validate_xmit_xfrm(), which could release skb secpath, and
cause the panic above.

This patch is to remove the skb from the chain when it's enqueued in
cryptd_wq. While at it, remove the unnecessary 'if (!skb)' check.

Fixes: 3dca3f38cfb8 ("xfrm: Separate ESP handling from segmentation for GRO packets.")
Reported-by: Xiumei Mu <>
Signed-off-by: Xin Long <>
 net/xfrm/xfrm_device.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/xfrm/xfrm_device.c b/net/xfrm/xfrm_device.c
index 3231ec6..e2db468 100644
--- a/net/xfrm/xfrm_device.c
+++ b/net/xfrm/xfrm_device.c
@@ -78,8 +78,8 @@ struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t featur
 	int err;
 	unsigned long flags;
 	struct xfrm_state *x;
-	struct sk_buff *skb2, *nskb;
 	struct softnet_data *sd;
+	struct sk_buff *skb2, *nskb, *pskb = NULL;
 	netdev_features_t esp_features = features;
 	struct xfrm_offload *xo = xfrm_offload(skb);
 	struct sec_path *sp;
@@ -168,14 +168,14 @@ struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t featur
 		} else {
 			if (skb == skb2)
 				skb = nskb;
-			if (!skb)
-				return NULL;
+			else
+				pskb->next = nskb;
 		skb_push(skb2, skb2->data - skb_mac_header(skb2));
+		pskb = skb2;
 	return skb;

Powered by blists - more mailing lists