kernel.git/Documentation/admin-guide/devices.txt, branch linux-5.16.y

Documentation, arch: Remove leftovers from raw device

2022-01-27T11:02:50Z

commit 473dcf0ffc31ce1135cd10578e7e06698cf51f4a upstream. Raw device interface was removed so remove all references to configs related to it. Fixes: 603e4922f1c8 ("remove the raw driver") Signed-off-by: Alexandre Ghiti Acked-by: Arnd Bergmann [arch/arm/configs] Signed-off-by: Arnd Bergmann Signed-off-by: Greg Kroah-Hartman

docs: Fix infiniband uverbs minor number

2021-07-30T13:05:50Z

Starting from the beginning of infiniband subsystem, the uverbs char devices start from 192 as a minor number, see commit bc38a6abdd5a ("[PATCH] IB uverbs: core implementation"). This patch updates the admin guide documentation to reflect it. Fixes: 9d85025b0418 ("docs-rst: create an user's manual book") Link: https://lore.kernel.org/r/bad03e6bcde45550c01e12908a6fe7dfa4770703.1627477347.git.leonro@nvidia.com Signed-off-by: Leon Romanovsky Signed-off-by: Jason Gunthorpe

drivers/char: remove /dev/kmem for good

2021-05-07T07:26:34Z

Patch series "drivers/char: remove /dev/kmem for good". Exploring /dev/kmem and /dev/mem in the context of memory hot(un)plug and memory ballooning, I started questioning the existence of /dev/kmem. Comparing it with the /proc/kcore implementation, it does not seem to be able to deal with things like a) Pages unmapped from the direct mapping (e.g., to be used by secretmem) -> kern_addr_valid(). virt_addr_valid() is not sufficient. b) Special cases like gart aperture memory that is not to be touched -> mem_pfn_is_ram() Unless I am missing something, it's at least broken in some cases and might fault/crash the machine. Looks like its existence has been questioned before in 2005 and 2010 [1], after ~11 additional years, it might make sense to revive the discussion. CONFIG_DEVKMEM is only enabled in a single defconfig (on purpose or by mistake?). All distributions disable it: in Ubuntu it has been disabled for more than 10 years, in Debian since 2.6.31, in Fedora at least starting with FC3, in RHEL starting with RHEL4, in SUSE starting from 15sp2, and OpenSUSE has it disabled as well. 1) /dev/kmem was popular for rootkits [2] before it got disabled basically everywhere. Ubuntu documents [3] "There is no modern user of /dev/kmem any more beyond attackers using it to load kernel rootkits.". RHEL documents in a BZ [5] "it served no practical purpose other than to serve as a potential security problem or to enable binary module drivers to access structures/functions they shouldn't be touching" 2) /proc/kcore is a decent interface to have a controlled way to read kernel memory for debugging puposes. (will need some extensions to deal with memory offlining/unplug, memory ballooning, and poisoned pages, though) 3) It might be useful for corner case debugging [1]. KDB/KGDB might be a better fit, especially, to write random memory; harder to shoot yourself into the foot. 4) "Kernel Memory Editor" [4] hasn't seen any updates since 2000 and seems to be incompatible with 64bit [1]. For educational purposes, /proc/kcore might be used to monitor value updates -- or older kernels can be used. 5) It's broken on arm64, and therefore, completely disabled there. Looks like it's essentially unused and has been replaced by better suited interfaces for individual tasks (/proc/kcore, KDB/KGDB). Let's just remove it. [1] https://lwn.net/Articles/147901/ [2] https://www.linuxjournal.com/article/10505 [3] https://wiki.ubuntu.com/Security/Features#A.2Fdev.2Fkmem_disabled [4] https://sourceforge.net/projects/kme/ [5] https://bugzilla.redhat.com/show_bug.cgi?id=154796 Link: https://lkml.kernel.org/r/20210324102351.6932-1-david@redhat.com Link: https://lkml.kernel.org/r/20210324102351.6932-2-david@redhat.com Signed-off-by: David Hildenbrand Acked-by: Michal Hocko Acked-by: Kees Cook Cc: Linus Torvalds Cc: Greg Kroah-Hartman Cc: "Alexander A. Klimov" Cc: Alexander Viro Cc: Alexandre Belloni Cc: Andrew Lunn Cc: Andrey Zhizhikin Cc: Arnd Bergmann Cc: Benjamin Herrenschmidt Cc: Brian Cain Cc: Christian Borntraeger Cc: Christophe Leroy Cc: Chris Zankel Cc: Corentin Labbe Cc: "David S. Miller" Cc: "Eric W. Biederman" Cc: Geert Uytterhoeven Cc: Gerald Schaefer Cc: Greentime Hu Cc: Gregory Clement Cc: Heiko Carstens Cc: Helge Deller Cc: Hillf Danton Cc: huang ying Cc: Ingo Molnar Cc: Ivan Kokshaysky Cc: "James E.J. Bottomley" Cc: James Troup Cc: Jiaxun Yang Cc: Jonas Bonn Cc: Jonathan Corbet Cc: Kairui Song Cc: Krzysztof Kozlowski Cc: Kuninori Morimoto Cc: Liviu Dudau Cc: Lorenzo Pieralisi Cc: Luc Van Oostenryck Cc: Luis Chamberlain Cc: Matthew Wilcox Cc: Matt Turner Cc: Max Filippov Cc: Michael Ellerman Cc: Mike Rapoport Cc: Mikulas Patocka Cc: Minchan Kim Cc: Niklas Schnelle Cc: Oleksiy Avramchenko Cc: openrisc@lists.librecores.org Cc: Palmer Dabbelt Cc: Paul Mackerras Cc: "Pavel Machek (CIP)" Cc: Pavel Machek Cc: "Peter Zijlstra (Intel)" Cc: Pierre Morel Cc: Randy Dunlap Cc: Richard Henderson Cc: Rich Felker Cc: Robert Richter Cc: Rob Herring Cc: Russell King Cc: Sam Ravnborg Cc: Sebastian Andrzej Siewior Cc: Sebastian Hesselbarth Cc: sparclinux@vger.kernel.org Cc: Stafford Horne Cc: Stefan Kristiansson Cc: Steven Rostedt Cc: Sudeep Holla Cc: Theodore Dubois Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: Viresh Kumar Cc: William Cohen Cc: Xiaoming Ni Cc: Yoshinori Sato Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

tty: isicom, remove this orphan

2021-03-10T08:34:06Z

The Isicom driver was orphaned by commit d86b3001a1a6 (MAINTAINERS: orphan isicom) 10 years ago. Noone stepped up to take care of them and to fix all the issues the driver has. So it's time to drop the driver with all its traces. Signed-off-by: Jiri Slaby Link: https://lore.kernel.org/r/20210302062214.29627-6-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman

tty: cyclades, remove this orphan

2021-03-10T08:34:06Z

The Cyclades driver was orphaned by commit d459883e6c54 (MAINTAINERS: remove two dead e-mail) 13 years ago. Noone stepped up to take care of them and to fix all the issues the driver has. On the top of that, there is no way to obtain the firmware for Z cards from the vendor as cyclades.com ceased to exist. So it's time to drop the driver with all its traces. Signed-off-by: Jiri Slaby Link: https://lore.kernel.org/r/20210302062214.29627-5-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman

devices.txt: fix typo of "ubd" as "udb"

2020-08-24T23:19:07Z

Signed-off-by: Theodore Dubois Link: https://lore.kernel.org/r/20200816233823.86316-1-tblodt@icloud.com Signed-off-by: Jonathan Corbet

devices.txt: document rfkill allocation

2020-07-27T22:21:33Z

Document rfkill allocation. Signed-off-by: Pavel Machek (CIP) Link: https://lore.kernel.org/r/20200726075327.GA25647@duo.ucw.cz Signed-off-by: Jonathan Corbet

Replace HTTP links with HTTPS ones: Documentation/admin-guide

2020-07-05T20:13:00Z

Rationale: Reduces attack surface on kernel devs opening the links for MITM as HTTPS traffic is much harder to manipulate. Deterministic algorithm: For each file: If not .svg: For each line: If doesn't contain `\bxmlns\b`: For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`: If both the HTTP and HTTPS versions return 200 OK and serve the same content: Replace HTTP with HTTPS. Signed-off-by: Alexander A. Klimov Link: https://lore.kernel.org/r/20200627072935.62652-1-grandmaster@al2klimov.de Signed-off-by: Jonathan Corbet

doc: fix typo of snapshot in documentation

2020-01-11T22:30:24Z

A couple of locations accidentally misspelled snapshot as shapshot. Signed-off-by: Jacob Keller Signed-off-by: David S. Miller

devices.txt: improve entry for comedi (char major 98)

2019-09-14T07:51:46Z

Describe how the comedi minor device numbers are split across comedi devices and comedi subdevices. Replace the current, long dead URL with an official URL for the Comedi project. Signed-off-by: Ian Abbott Signed-off-by: Jonathan Corbet