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Filename Latest commit message Latest commit date
Guillaume Nault 2fd90b86df veth: Ensure eth header is in skb's linear part 
[ Upstream commit 726e2c5929de841fdcef4e2bf995680688ae1b87 ]

After feeding a decapsulated packet to a veth device with act_mirred,
skb_headlen() may be 0. But veth_xmit() calls __dev_forward_skb(),
which expects at least ETH_HLEN byte of linear data (as
__dev_forward_skb2() calls eth_type_trans(), which pulls ETH_HLEN bytes
unconditionally).

Use pskb_may_pull() to ensure veth_xmit() respects this constraint.

kernel BUG at include/linux/skbuff.h:2328!
RIP: 0010:eth_type_trans+0xcf/0x140
Call Trace:
 <IRQ>
 __dev_forward_skb2+0xe3/0x160
 veth_xmit+0x6e/0x250 [veth]
 dev_hard_start_xmit+0xc7/0x200
 __dev_queue_xmit+0x47f/0x520
 ? skb_ensure_writable+0x85/0xa0
 ? skb_mpls_pop+0x98/0x1c0
 tcf_mirred_act+0x442/0x47e [act_mirred]
 tcf_action_exec+0x86/0x140
 fl_classify+0x1d8/0x1e0 [cls_flower]
 ? dma_pte_clear_level+0x129/0x1a0
 ? dma_pte_clear_level+0x129/0x1a0
 ? prb_fill_curr_block+0x2f/0xc0
 ? skb_copy_bits+0x11a/0x220
 __tcf_classify+0x58/0x110
 tcf_classify_ingress+0x6b/0x140
 __netif_receive_skb_core.constprop.0+0x47d/0xfd0
 ? __iommu_dma_unmap_swiotlb+0x44/0x90
 __netif_receive_skb_one_core+0x3d/0xa0
 netif_receive_skb+0x116/0x170
 be_process_rx+0x22f/0x330 [be2net]
 be_poll+0x13c/0x370 [be2net]
 __napi_poll+0x2a/0x170
 net_rx_action+0x22f/0x2f0
 __do_softirq+0xca/0x2a8
 __irq_exit_rcu+0xc1/0xe0
 common_interrupt+0x83/0xa0

Fixes: e314dbdc1c ("[NET]: Virtual ethernet device driver.")
Signed-off-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-04-20 09:19:34 +02:00
arch cpuidle: PSCI: Move the has_lpi check to the beginning of the function 2022-04-15 14:18:41 +02:00
block Revert "Revert "block, bfq: honor already-setup queue merges"" 2022-04-15 14:18:23 +02:00
certs
crypto crypto: authenc - Fix sleep in atomic context in decrypt_tail 2022-04-15 14:18:04 +02:00
Documentation dt-bindings: spi: mxic: The interrupt property is not mandatory 2022-04-15 14:18:30 +02:00
drivers veth: Ensure eth header is in skb's linear part 2022-04-20 09:19:34 +02:00
fs io_uring: fix fs->users overflow 2022-04-15 14:18:41 +02:00
include net/sched: flower: fix parsing of ethertype following VLAN header 2022-04-20 09:19:34 +02:00
init init/main.c: return 1 from handled __setup() functions 2022-04-15 14:18:35 +02:00
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-12-01 09:23:35 +01:00
kernel cgroup: Use open-time cgroup namespace for process migration perm checks 2022-04-15 14:18:41 +02:00
lib lz4: fix LZ4_decompress_safe_partial read out of bound 2022-04-15 14:18:39 +02:00
LICENSES
mm mm: don't skip swap entry even if zap_details specified 2022-04-15 14:18:40 +02:00
net net/sched: flower: fix parsing of ethertype following VLAN header 2022-04-20 09:19:34 +02:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-17 09:48:39 +01:00
scripts gcc-plugins/stackleak: Exactly match strings instead of prefixes 2022-04-15 14:18:22 +02:00
security Fix incorrect type in assignment of ipv6 port for audit 2022-04-15 14:18:22 +02:00
sound ASoC: topology: Allow TLV control to be either read or write 2022-04-15 14:18:30 +02:00
tools selftests: cgroup: Test open-time cgroup namespace usage for migration checks 2022-04-15 14:18:41 +02:00
usr
virt KVM: Prevent module exit until all VMs are freed 2022-04-15 14:18:27 +02:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS
Makefile Linux 5.4.189 2022-04-15 14:18:42 +02:00
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.