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Eric Dumazet 38ec4944b5 gro: ensure frag0 meets IP header alignment 
After commit 0f6925b3e8 ("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: 0f6925b3e8 ("virtio_net: Do not pull payload in skb->head")
Fixes: 78a478d0ef ("gro: Inline skb_gro_header and cache frag0 virtual address")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Cc: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-04-13 15:09:31 -07:00
arch Networking fixes for 5.12-rc7, including fixes from can, ipsec, 2021-04-09 15:26:51 -07:00
block
certs
crypto
Documentation Networking fixes for 5.12-rc7, including fixes from can, ipsec, 2021-04-09 15:26:51 -07:00
drivers ibmvnic: correctly use dev_consume/free_skb_irq 2021-04-13 14:49:30 -07:00
fs
include Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf 2021-04-12 16:17:50 -07:00
init
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kernel Networking fixes for 5.12-rc7, including fixes from can, ipsec, 2021-04-09 15:26:51 -07:00
lib
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net gro: ensure frag0 meets IP header alignment 2021-04-13 15:09:31 -07:00
samples
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tools Networking fixes for 5.12-rc7, including fixes from can, ipsec, 2021-04-09 15:26:51 -07:00
usr
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MAINTAINERS MAINTAINERS: update maintainer entry for freescale fec driver 2021-04-11 16:41:08 -07:00
Makefile
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.