Merge branch 'bpf-test-prog-fixes'

I say:

====================
Fix some bpf program testing framework bugs

This series fixes two issue:

1) Accidental user pointer dereference in bpf_test_finish()

2) The packet data given to the test programs is not aligned correctly

The first issue is fixed simply because we have a kernel side copy
of the datastructure in question already.  And the second bug is
a simple matter of applying NET_IP_ALIGN where needed.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 9 deletions

diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index 8a6d0a37c30c..6be41a44d688 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -49,10 +49,11 @@ static u32 bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat, u32 *time)
         return ret;
 }
 
-static int bpf_test_finish(union bpf_attr __user *uattr, const void *data,
+static int bpf_test_finish(const union bpf_attr *kattr,
+                           union bpf_attr __user *uattr, const void *data,
                            u32 size, u32 retval, u32 duration)
 {
-        void __user *data_out = u64_to_user_ptr(uattr->test.data_out);
+        void __user *data_out = u64_to_user_ptr(kattr->test.data_out);
         int err = -EFAULT;
 
         if (data_out && copy_to_user(data_out, data, size))
@@ -99,7 +100,7 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
         void *data;
         int ret;
 
-        data = bpf_test_init(kattr, size, NET_SKB_PAD,
+        data = bpf_test_init(kattr, size, NET_SKB_PAD + NET_IP_ALIGN,
                              SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
         if (IS_ERR(data))
                 return PTR_ERR(data);
@@ -124,7 +125,7 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
                 return -ENOMEM;
         }
 
-        skb_reserve(skb, NET_SKB_PAD);
+        skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
         __skb_put(skb, size);
         skb->protocol = eth_type_trans(skb, current->nsproxy->net_ns->loopback_dev);
         skb_reset_network_header(skb);
@@ -140,7 +141,7 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
         /* bpf program can never convert linear skb to non-linear */
         if (WARN_ON_ONCE(skb_is_nonlinear(skb)))
                 size = skb_headlen(skb);
-        ret = bpf_test_finish(uattr, skb->data, size, retval, duration);
+        ret = bpf_test_finish(kattr, uattr, skb->data, size, retval, duration);
         kfree_skb(skb);
         return ret;
 }
@@ -155,18 +156,18 @@ int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
         void *data;
         int ret;
 
-        data = bpf_test_init(kattr, size, XDP_PACKET_HEADROOM, 0);
+        data = bpf_test_init(kattr, size, XDP_PACKET_HEADROOM + NET_IP_ALIGN, 0);
         if (IS_ERR(data))
                 return PTR_ERR(data);
 
         xdp.data_hard_start = data;
-        xdp.data = data + XDP_PACKET_HEADROOM;
+        xdp.data = data + XDP_PACKET_HEADROOM + NET_IP_ALIGN;
         xdp.data_end = xdp.data + size;
 
         retval = bpf_test_run(prog, &xdp, repeat, &duration);
-        if (xdp.data != data + XDP_PACKET_HEADROOM)
+        if (xdp.data != data + XDP_PACKET_HEADROOM + NET_IP_ALIGN)
                 size = xdp.data_end - xdp.data;
-        ret = bpf_test_finish(uattr, xdp.data, size, retval, duration);
+        ret = bpf_test_finish(kattr, uattr, xdp.data, size, retval, duration);
         kfree(data);
         return ret;
 }