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Vincent Mailhol c67732d067 can: annotate mtu accesses with READ_ONCE()
As hinted in commit 501a90c945 ("inet: protect against too small mtu
values."), net_device->mtu is vulnerable to race conditions if it is
written and read without holding the RTNL.

At the moment, all the writes are done while the interface is down,
either in the devices' probe() function or in can_changelink(). So
there are no such issues yet. But upcoming changes will allow to
modify the MTU while the CAN XL devices are up.

In preparation to the introduction of CAN XL, annotate all the
net_device->mtu accesses which are not yet guarded by the RTNL with a
READ_ONCE().

Note that all the write accesses are already either guarded by the
RTNL or are already annotated and thus need no changes.

Signed-off-by: Vincent Mailhol <mailhol@kernel.org>
Link: https://patch.msgid.link/20250923-can-fix-mtu-v3-1-581bde113f52@kernel.org
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2025-09-23 10:04:58 +02:00
Documentation dt-bindings: net: Drop duplicate brcm,bcm7445-switch-v4.0.txt 2025-09-12 17:05:06 -07:00
LICENSES LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2 2025-07-24 11:15:39 +02:00
arch Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-09-11 17:40:13 -07:00
block vfs-6.17-rc6.fixes 2025-09-08 07:53:01 -07:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: sha512 - Implement export_core() and import_core() 2025-09-02 19:02:39 -07:00
drivers can: esd_usb: Avoid errors triggered from USB disconnect 2025-09-19 20:03:47 +02:00
fs for-6.17-rc5-tag 2025-09-11 08:01:18 -07:00
include can: peak: Modification of references to email accounts being deleted 2025-09-13 19:04:57 +02:00
init 20 hotfixes. 15 are cc:stable and the remainder address post-6.16 issues 2025-09-10 21:19:34 -07:00
io_uring Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-09-11 17:40:13 -07:00
ipc vfs-6.17-rc1.mmap_prepare 2025-07-28 13:43:25 -07:00
kernel Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-09-11 17:40:13 -07:00
lib hardening fixes for v6.17-rc4 2025-08-31 08:56:45 -07:00
mm Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-09-11 17:40:13 -07:00
net can: annotate mtu accesses with READ_ONCE() 2025-09-23 10:04:58 +02:00
rust Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-09-11 17:40:13 -07:00
samples ftrace/samples: Fix function size computation 2025-09-05 18:39:12 -04:00
scripts Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-09-11 17:40:13 -07:00
security + Features 2025-08-04 08:17:28 -07:00
sound ALSA: hda/hdmi: Add pin fix for another HP EliteDesk 800 G4 model 2025-09-01 13:51:57 +02:00
tools netfilter pull request nf-next-25-09-11 2025-09-12 17:06:25 -07:00
usr usr/include: openrisc: don't HDRTEST bpf_perf_event.h 2025-05-12 15:03:17 +09:00
virt Merge tag 'kvm-x86-no_assignment-6.17' of https://github.com/kvm-x86/linux into HEAD 2025-07-29 08:36:42 -04:00
.clang-format Linux 6.15-rc5 2025-05-06 16:39:25 +10:00
.clippy.toml rust: clean Rust 1.88.0's warning about `clippy::disallowed_macros` configuration 2025-05-07 00:11:47 +02:00
.cocciconfig
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: Retire Ralf Baechle 2024-11-12 15:48:59 +01:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore gitignore: allow .pylintrc to be tracked 2025-07-02 17:10:04 -06:00
.mailmap can: peak: Modification of references to email accounts being deleted 2025-09-13 19:04:57 +02:00
.pylintrc docs: add a .pylintrc file with sys path for docs scripts 2025-04-09 12:10:33 -06:00
.rustfmt.toml
COPYING
CREDITS MAINTAINERS: retire Boris from TLS maintainers 2025-08-26 17:36:01 -07:00
Kbuild drm: ensure drm headers are self-contained and pass kernel-doc 2025-02-12 10:44:43 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS MAINTAINERS: update Vincent Mailhol's email address 2025-09-13 19:04:37 +02:00
Makefile Linux 6.17-rc5 2025-09-07 14:22:57 -07:00
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.