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Toke Høiland-Jørgensen 30d015f5ec vlan: consolidate VLAN parsing code and limit max parsing depth
[ Upstream commit 469aceddfa3ed16e17ee30533fae45e90f62efd8 ]

Toshiaki pointed out that we now have two very similar functions to extract
the L3 protocol number in the presence of VLAN tags. And Daniel pointed out
that the unbounded parsing loop makes it possible for maliciously crafted
packets to loop through potentially hundreds of tags.

Fix both of these issues by consolidating the two parsing functions and
limiting the VLAN tag parsing to a max depth of 8 tags. As part of this,
switch over __vlan_get_protocol() to use skb_header_pointer() instead of
pskb_may_pull(), to avoid the possible side effects of the latter and keep
the skb pointer 'const' through all the parsing functions.

v2:
- Use limit of 8 tags instead of 32 (matching XMIT_RECURSION_LIMIT)

Reported-by: Toshiaki Makita <toshiaki.makita1@gmail.com>
Reported-by: Daniel Borkmann <daniel@iogearbox.net>
Fixes: d7bf2ebebc2b ("sched: consistently handle layer3 header accesses in the presence of VLANs")
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-22 09:32:49 +02:00
arch s390/maccess: add no DAT mode to kernel_write 2020-07-16 08:16:48 +02:00
block blk-mq: consider non-idle request as "inflight" in blk_mq_rq_inflight() 2020-07-16 08:16:47 +02:00
certs
crypto crypto: af_alg - fix use-after-free in af_alg_accept() due to bh_lock_sock() 2020-07-09 09:37:52 +02:00
Documentation
drivers net: usb: qmi_wwan: add support for Quectel EG95 LTE modem 2020-07-22 09:32:48 +02:00
fs btrfs: fix double put of block group with nocow 2020-07-16 08:16:45 +02:00
include vlan: consolidate VLAN parsing code and limit max parsing depth 2020-07-22 09:32:49 +02:00
init
ipc
kernel bpf: Check correct cred for CAP_SYSLOG in bpf_dump_raw_ok() 2020-07-16 08:16:45 +02:00
lib test_objagg: Fix potential memory leak in error handling 2020-06-30 15:37:04 -04:00
LICENSES
mm mm, compaction: make capture control handling safe wrt interrupts 2020-07-09 09:37:57 +02:00
net tcp: md5: do not send silly options in SYNCOOKIES 2020-07-22 09:32:49 +02:00
samples samples/vfs: avoid warning in statx override 2020-07-09 09:37:54 +02:00
scripts recordmcount: support >64k sections 2020-06-30 15:37:05 -04:00
security
sound ALSA: hda/realtek: Enable headset mic of Acer Veriton N4660G with ALC269VC 2020-07-16 08:16:43 +02:00
tools ipv6: fib6_select_path can not use out path for nexthop objects 2020-07-22 09:32:47 +02:00
usr
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COPYING
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Makefile Linux 5.4.52 2020-07-16 08:16:48 +02:00
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.