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Filename Latest commit message Latest commit date
Yan Zhai 67f8f2bae8 lwt: Fix return values of BPF xmit ops
[ Upstream commit 29b22badb7a84b783e3a4fffca16f7768fb31205 ]

BPF encap ops can return different types of positive values, such like
NET_RX_DROP, NET_XMIT_CN, NETDEV_TX_BUSY, and so on, from function
skb_do_redirect and bpf_lwt_xmit_reroute. At the xmit hook, such return
values would be treated implicitly as LWTUNNEL_XMIT_CONTINUE in
ip(6)_finish_output2. When this happens, skbs that have been freed would
continue to the neighbor subsystem, causing use-after-free bug and
kernel crashes.

To fix the incorrect behavior, skb_do_redirect return values can be
simply discarded, the same as tc-egress behavior. On the other hand,
bpf_lwt_xmit_reroute returns useful errors to local senders, e.g. PMTU
information. Thus convert its return values to avoid the conflict with
LWTUNNEL_XMIT_CONTINUE.

Fixes: 3a0af8fd61 ("bpf: BPF for lightweight tunnel infrastructure")
Reported-by: Jordan Griege <jgriege@cloudflare.com>
Suggested-by: Martin KaFai Lau <martin.lau@linux.dev>
Suggested-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Yan Zhai <yan@cloudflare.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/0d2b878186cfe215fec6b45769c1cd0591d3628d.1692326837.git.yan@cloudflare.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-09-23 10:59:42 +02:00
arch x86/decompressor: Don't rely on upper 32 bits of GPRs being preserved 2023-09-23 10:59:41 +02:00
block block/partition: fix signedness issue for Amiga partitions 2023-07-27 08:37:29 +02:00
certs
crypto
Documentation Documentation/sysctl: document page_lock_unfairness 2023-08-30 16:27:27 +02:00
drivers hwrng: iproc-rng200 - Implement suspend and resume calls 2023-09-23 10:59:42 +02:00
fs fs: Fix error checking for d_hash_and_lookup() 2023-09-23 10:59:40 +02:00
include tcp: tcp_enter_quickack_mode() should be static 2023-09-23 10:59:41 +02:00
init x86/mm: Initialize text poking earlier 2023-08-08 19:56:36 +02:00
ipc
kernel bpf: Clear the probe_addr for uprobe 2023-09-23 10:59:41 +02:00
lib radix tree: remove unused variable 2023-08-30 16:27:26 +02:00
LICENSES
mm tmpfs: verify {g,u}id mount options correctly 2023-09-23 10:59:40 +02:00
net lwt: Fix return values of BPF xmit ops 2023-09-23 10:59:42 +02:00
samples
scripts
security security: keys: perform capable check only on privileged operations 2023-09-23 10:59:39 +02:00
sound ALSA: seq: oss: Fix racy open/close of MIDI devices 2023-09-23 10:59:39 +02:00
tools selftests: mirror_gre_changes: Tighten up the TTL test match 2023-08-30 16:27:16 +02:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS iio: stx104: Move to addac subdirectory 2023-08-30 16:27:12 +02:00
Makefile Linux 5.4.256 2023-09-02 09:19:19 +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.