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Qingfang Deng abc5bc84e0 flow_dissector: do not dissect PPPoE PFC frames [ Upstream commit `d6c19b31a3` ] RFC 2516 Section 7 states that Protocol Field Compression (PFC) is NOT RECOMMENDED for PPPoE. In practice, pppd does not support negotiating PFC for PPPoE sessions, and the flow dissector driver has assumed an uncompressed frame until the blamed commit. During the review process of that commit [1], support for PFC is suggested. However, having a compressed (1-byte) protocol field means the subsequent PPP payload is shifted by one byte, causing 4-byte misalignment for the network header and an unaligned access exception on some architectures. The exception can be reproduced by sending a PPPoE PFC frame to an ethernet interface of a MIPS board, with RPS enabled, even if no PPPoE session is active on that interface: $ 0 : 00000000 80c40000 00000000 85144817 $ 4 : 00000008 00000100 80a75758 81dc9bb8 $ 8 : 00000010 8087ae2c 0000003d 00000000 $12 : 000000e0 00000039 00000000 00000000 $16 : 85043240 80a75758 81dc9bb8 00006488 $20 : 0000002f 00000007 85144810 80a70000 $24 : 81d1bda0 00000000 $28 : 81dc8000 81dc9aa8 00000000 805ead08 Hi : 00009d51 Lo : 2163358a epc : 805e91f0 __skb_flow_dissect+0x1b0/0x1b50 ra : 805ead08 __skb_get_hash_net+0x74/0x12c Status: 11000403 KERNEL EXL IE Cause : 40800010 (ExcCode 04) BadVA : 85144817 PrId : 0001992f (MIPS 1004Kc) Call Trace: [<805e91f0>] __skb_flow_dissect+0x1b0/0x1b50 [<805ead08>] __skb_get_hash_net+0x74/0x12c [<805ef330>] get_rps_cpu+0x1b8/0x3fc [<805fca70>] netif_receive_skb_list_internal+0x324/0x364 [<805fd120>] napi_complete_done+0x68/0x2a4 [<8058de5c>] mtk_napi_rx+0x228/0xfec [<805fd398>] __napi_poll+0x3c/0x1c4 [<805fd754>] napi_threaded_poll_loop+0x234/0x29c [<805fd848>] napi_threaded_poll+0x8c/0xb0 [<80053544>] kthread+0x104/0x12c [<80002bd8>] ret_from_kernel_thread+0x14/0x1c Code: 02d51821 1060045b 00000000 <8c640000> 3084000f 2c820005 144001a2 00042080 8e220000 To reduce the attack surface and maintain performance, do not process PPPoE PFC frames. [1] https://lore.kernel.org/r/20220630231016.GA392@debian.home Fixes: `46126db9c8` ("flow_dissector: Add PPPoE dissectors") Signed-off-by: Qingfang Deng <qingfang.deng@linux.dev> Link: https://patch.msgid.link/20260415022456.141758-1-qingfang.deng@linux.dev Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2026-06-01 17:35:44 +02:00
arch	arm64: dts: meson-gxl-p230: fix ethernet PHY interrupt number	2026-06-01 17:35:39 +02:00
block	blk-mq: use quiesced elevator switch when reinitializing queues	2026-06-01 17:35:09 +02:00
certs	certs/blacklist_hashes.c: fix const confusion in certs blacklist	2022-06-22 14:22:01 +02:00
crypto	crypto: authencesn - reject short ahash digests during instance creation	2026-06-01 17:35:18 +02:00
Documentation	Documentation: fix a hugetlbfs reservation statement	2026-06-01 17:35:32 +02:00
drivers	drm/amd/display: Read EDID from VBIOS embedded panel info	2026-06-01 17:35:43 +02:00
fs	btrfs: fix double-decrement of bytes_may_use in submit_one_async_extent()	2026-06-01 17:35:41 +02:00
include	SUNRPC: Do not dereference non-socket transports in sysfs	2026-06-01 17:35:44 +02:00
init	init: handle bootloader identifier in kernel parameters	2025-10-19 16:21:45 +02:00
io_uring	io_uring/poll: fix backport of io_poll_add() changes	2026-06-01 17:35:17 +02:00
ipc	ipc: fix to protect IPCS lookups using RCU	2025-06-27 11:05:26 +01:00
kernel	tracing: branch: Fix inverted check on stat tracer registration	2026-06-01 17:35:41 +02:00
lib	lib/ts_kmp: fix integer overflow in pattern length calculation	2026-06-01 17:35:14 +02:00
LICENSES	LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes"	2021-07-15 06:31:24 -06:00
mm	mm: blk-cgroup: fix use-after-free in cgwb_release_workfn()	2026-06-01 17:35:08 +02:00
net
samples	samples: mei: Fix building on musl libc	2025-08-28 16:24:07 +02:00
scripts	scripts/dtc: Remove unused dts_version in dtc-lexer.l	2026-06-01 17:35:12 +02:00
security	ima: check return value of crypto_shash_final() in boot aggregate	2026-06-01 17:35:34 +02:00
sound	ALSA: hda/conexant: Fix missing error check for jack detection	2026-06-01 17:35:43 +02:00
tools	perf util: Kill die() prototype, dead for a long time	2026-06-01 17:35:35 +02:00
usr	kbuild: hdrcheck: fix cross build with clang	2025-06-27 11:05:22 +01:00
virt	KVM: Don't clobber irqfd routing type when deassigning irqfd	2026-02-11 13:35:27 +01:00
.clang-format	clang-format: Update with the latest for_each macro list	2021-05-12 23:32:39 +02:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	Remove *.orig pattern from .gitignore	2024-10-17 15:11:10 +02:00
.mailmap	mailmap: add Andrej Shadura	2021-10-18 20:22:03 -10:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Move Daniel Drake to credits	2021-09-21 08:34:58 +03:00
Kbuild	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	staging: rtl8712: Remove driver using deprecated API wext	2025-12-07 06:09:36 +09:00
Makefile	Linux 5.15.208	2026-05-23 13:40:45 +02:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00

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.