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Stefan Wiehler 97a2bb90a6 sctp: Hold RCU read lock while iterating over address list 
[ Upstream commit 38f50242bf ]

With CONFIG_PROVE_RCU_LIST=y and by executing

  $ netcat -l --sctp &
  $ netcat --sctp localhost &
  $ ss --sctp

one can trigger the following Lockdep-RCU splat(s):

  WARNING: suspicious RCU usage
  6.18.0-rc1-00093-g7f864458e9a6 #5 Not tainted
  -----------------------------
  net/sctp/diag.c:76 RCU-list traversed in non-reader section!!

  other info that might help us debug this:

  rcu_scheduler_active = 2, debug_locks = 1
  2 locks held by ss/215:
   #0: ffff9c740828bec0 (nlk_cb_mutex-SOCK_DIAG){+.+.}-{4:4}, at: __netlink_dump_start+0x84/0x2b0
   #1: ffff9c7401d72cd0 (sk_lock-AF_INET6){+.+.}-{0:0}, at: sctp_sock_dump+0x38/0x200

  stack backtrace:
  CPU: 0 UID: 0 PID: 215 Comm: ss Not tainted 6.18.0-rc1-00093-g7f864458e9a6 #5 PREEMPT(voluntary)
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
  Call Trace:
   <TASK>
   dump_stack_lvl+0x5d/0x90
   lockdep_rcu_suspicious.cold+0x4e/0xa3
   inet_sctp_diag_fill.isra.0+0x4b1/0x5d0
   sctp_sock_dump+0x131/0x200
   sctp_transport_traverse_process+0x170/0x1b0
   ? __pfx_sctp_sock_filter+0x10/0x10
   ? __pfx_sctp_sock_dump+0x10/0x10
   sctp_diag_dump+0x103/0x140
   __inet_diag_dump+0x70/0xb0
   netlink_dump+0x148/0x490
   __netlink_dump_start+0x1f3/0x2b0
   inet_diag_handler_cmd+0xcd/0x100
   ? __pfx_inet_diag_dump_start+0x10/0x10
   ? __pfx_inet_diag_dump+0x10/0x10
   ? __pfx_inet_diag_dump_done+0x10/0x10
   sock_diag_rcv_msg+0x18e/0x320
   ? __pfx_sock_diag_rcv_msg+0x10/0x10
   netlink_rcv_skb+0x4d/0x100
   netlink_unicast+0x1d7/0x2b0
   netlink_sendmsg+0x203/0x450
   ____sys_sendmsg+0x30c/0x340
   ___sys_sendmsg+0x94/0xf0
   __sys_sendmsg+0x83/0xf0
   do_syscall_64+0xbb/0x390
   entry_SYSCALL_64_after_hwframe+0x77/0x7f
   ...
   </TASK>

Fixes: 8f840e47f1 ("sctp: add the sctp_diag.c file")
Signed-off-by: Stefan Wiehler <stefan.wiehler@nokia.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Acked-by: Xin Long <lucien.xin@gmail.com>
Link: https://patch.msgid.link/20251028161506.3294376-2-stefan.wiehler@nokia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-11-13 15:34:38 -05:00
arch riscv: ptdump: use seq_puts() in pt_dump_seq_puts() macro 2025-11-13 15:34:36 -05:00
block blk-cgroup: fix possible deadlock while configuring policy 2025-11-13 15:34:07 -05:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: essiv - Check ssize for decryption and in-place encryption 2025-10-19 16:33:42 +02:00
Documentation dpll: spec: add missing module-name and clock-id to pin-get reply 2025-11-13 15:33:59 -05:00
drivers net: dsa: b53: stop reading ARL entries if search is done 2025-11-13 15:34:37 -05:00
fs btrfs: ensure no dirty metadata is written back for an fs with errors 2025-11-13 15:34:36 -05:00
include scsi: ufs: core: Include UTP error in INT_FATAL_ERRORS 2025-11-13 15:34:34 -05:00
init init: handle bootloader identifier in kernel parameters 2025-10-19 16:33:50 +02:00
io_uring io_uring/zctx: check chained notif contexts 2025-11-13 15:34:03 -05:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:11:22 +01:00
kernel ring-buffer: Do not warn in ring_buffer_map_get_reader() when reader catches up 2025-11-13 15:34:36 -05:00
lib kunit: test_dev_action: Correctly cast 'priv' pointer to long* 2025-11-13 15:33:57 -05:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm: prevent poison consumption when splitting THP 2025-10-29 14:08:57 +01:00
net sctp: Hold RCU read lock while iterating over address list 2025-11-13 15:34:38 -05:00
rust mm/ksm: fix flag-dropping behavior in ksm_madvise 2025-10-23 16:20:47 +02:00
samples ftrace/samples: Fix function size computation 2025-09-19 16:35:44 +02:00
scripts gcc-plugins: Remove TODO_verify_il for GCC >= 16 2025-10-06 11:17:52 +02:00
security ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr 2025-11-13 15:34:32 -05:00
sound ALSA: hda/realtek: Audio disappears on HP 15-fc000 after warm boot again 2025-11-13 15:34:36 -05:00
tools selftests: netdevsim: Fix ethtool-coalesce.sh fail by installing ethtool-common.sh 2025-11-13 15:34:37 -05:00
usr kbuild: uapi: Strip comments before size type check 2025-11-13 15:34:35 -05:00
virt KVM: Allow CPU to reschedule while setting per-page memory attributes 2025-07-17 18:37:08 +02:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.clippy.toml rust: give Clippy the minimum supported Rust version 2025-08-01 09:48:44 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore rust: introduce .clippy.toml 2025-03-13 13:01:42 +01:00
.mailmap mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -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 self from DSA entry 2024-11-03 12:52:38 -08:00
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 MAINTAINERS: Update Alexey Makhalov's email address 2025-05-22 14:29:46 +02:00
Makefile Linux 6.12.57 2025-11-02 22:15:23 +09:00
README README: Fix spelling 2024-03-18 03:36:32 -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 reStructuredText 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.