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Xuanqiang Luo fd35a97fbb inet: Avoid ehash lookup race in inet_ehash_insert() 
[ Upstream commit 1532ed0d07 ]

Since ehash lookups are lockless, if one CPU performs a lookup while
another concurrently deletes and inserts (removing reqsk and inserting sk),
the lookup may fail to find the socket, an RST may be sent.

The call trace map is drawn as follows:
   CPU 0                           CPU 1
   -----                           -----
				inet_ehash_insert()
                                spin_lock()
                                sk_nulls_del_node_init_rcu(osk)
__inet_lookup_established()
	(lookup failed)
                                __sk_nulls_add_node_rcu(sk, list)
                                spin_unlock()

As both deletion and insertion operate on the same ehash chain, this patch
introduces a new sk_nulls_replace_node_init_rcu() helper functions to
implement atomic replacement.

Fixes: 5e0724d027 ("tcp/dccp: fix hashdance race for passive sessions")
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Signed-off-by: Xuanqiang Luo <luoxuanqiang@kylinos.cn>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20251015020236.431822-3-xuanqiang.luo@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-01-11 15:18:19 +01:00
arch LoongArch: Mask all interrupts during kexec/kdump 2026-01-11 15:18:16 +01:00
block block: fix race between set_blocksize and read paths 2025-12-07 06:12:14 +09:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2025-04-25 10:44:04 +02:00
crypto crypto: essiv - Check ssize for decryption and in-place encryption 2025-10-19 16:23:10 +02:00
Documentation Documentation: process: Also mention Sasha Levin as stable tree maintainer 2026-01-11 15:18:13 +01:00
drivers irqchip/qcom-irq-combiner: Fix section mismatch 2026-01-11 15:18:18 +01:00
fs ntfs3: Fix uninit buffer allocated by __getname() 2026-01-11 15:18:18 +01:00
include inet: Avoid ehash lookup race in inet_ehash_insert() 2026-01-11 15:18:19 +01:00
init init: handle bootloader identifier in kernel parameters 2025-10-19 16:23:13 +02:00
io_uring io_uring: correct __must_hold annotation in io_install_fixed_file 2025-10-29 14:04:38 +01:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:07:30 +01:00
kernel ftrace: bpf: Fix IPMODIFY + DIRECT in modify_ftrace_direct() 2026-01-11 15:18:14 +01:00
lib maple_tree: fix tracepoint string pointers 2025-12-07 06:12:40 +09:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm filemap: cap PTE range to be created to allowed zero fill in folio_map_range() 2025-12-07 06:12:41 +09:00
net inet: Avoid ehash lookup race in inet_ehash_insert() 2026-01-11 15:18:19 +01:00
rust mm/ksm: fix flag-dropping behavior in ksm_madvise 2025-10-29 14:04:43 +01:00
samples samples: work around glibc redefining some of our defines wrong 2026-01-11 15:18:16 +01:00
scripts kconfig/nconf: Initialize the default locale at startup 2025-12-07 06:12:39 +09:00
security smack: fix bug: unprivileged task can create labels 2026-01-11 15:18:17 +01:00
sound ALSA: usb-audio: Add native DSD quirks for PureAudio DAC series 2026-01-11 15:18:15 +01:00
tools objtool: Fix weak symbol detection 2026-01-11 15:18:18 +01:00
usr kbuild: uapi: Strip comments before size type check 2025-12-07 06:12:28 +09:00
virt KVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin() 2024-06-27 13:46:21 +02:00
.clang-format inet: ping: use hlist_nulls rcu iterator during lookup 2022-12-01 12:42:46 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -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 15:21:15 +02:00
.mailmap 9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address 2022-12-10 17:10:52 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Remove Michal Marek from Kbuild maintainers 2022-11-16 14:53:00 +09:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
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 06:12:45 +09:00
Makefile Linux 6.1.159 2025-12-07 06:12:46 +09:00
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.