[PATCH 4.19 02/30] gro: ensure frag0 meets IP header alignment

From: Greg Kroah-Hartman
Date: Mon Aug 02 2021 - 09:55:04 EST

From: Eric Dumazet <edumazet@xxxxxxxxxx>

commit 38ec4944b593fd90c5ef42aaaa53e66ae5769d04 upstream.

After commit 0f6925b3e8da ("virtio_net: Do not pull payload in skb->head")
Guenter Roeck reported one failure in his tests using sh architecture.

After much debugging, we have been able to spot silent unaligned accesses
in inet_gro_receive()

The issue at hand is that upper networking stacks assume their header
is word-aligned. Low level drivers are supposed to reserve NET_IP_ALIGN
bytes before the Ethernet header to make that happen.

This patch hardens skb_gro_reset_offset() to not allow frag0 fast-path
if the fragment is not properly aligned.

Some arches like x86, arm64 and powerpc do not care and define NET_IP_ALIGN
as 0, this extra check will be a NOP for them.

Note that if frag0 is not used, GRO will call pskb_may_pull()
as many times as needed to pull network and transport headers.

Fixes: 0f6925b3e8da ("virtio_net: Do not pull payload in skb->head")
Fixes: 78a478d0efd9 ("gro: Inline skb_gro_header and cache frag0 virtual address")
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Reported-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Cc: Jason Wang <jasowang@xxxxxxxxxx>
Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Tested-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Matthieu Baerts <matthieu.baerts@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
include/linux/skbuff.h | 9 +++++++++
net/core/dev.c | 3 ++-
2 files changed, 11 insertions(+), 1 deletion(-)

--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2789,6 +2789,15 @@ static inline void skb_propagate_pfmemal

+ * skb_frag_off() - Returns the offset of a skb fragment
+ * @frag: the paged fragment
+ */
+static inline unsigned int skb_frag_off(const skb_frag_t *frag)
+ return frag->page_offset;
* skb_frag_page - retrieve the page referred to by a paged fragment
* @frag: the paged fragment
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5400,7 +5400,8 @@ static void skb_gro_reset_offset(struct

if (skb_mac_header(skb) == skb_tail_pointer(skb) &&
pinfo->nr_frags &&
- !PageHighMem(skb_frag_page(frag0))) {
+ !PageHighMem(skb_frag_page(frag0)) &&
+ (!NET_IP_ALIGN || !(skb_frag_off(frag0) & 3))) {
NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0);
NAPI_GRO_CB(skb)->frag0_len = min_t(unsigned int,