Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.
Eric Dumazet
authored
commit 38ec4944 upstream. After commit 0f6925b3 ("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: 0f6925b3 ("virtio_net: Do not pull payload in skb->head") Fixes: 78a478d0 ("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:
David S. Miller <davem@davemloft.net> Signed-off-by:
Matthieu Baerts <matthieu.baerts@tessares.net> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>