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Ido Schimmel 76dd072813 ipv6: Fix crash when IPv6 is administratively disabled 
The global 'raw_v6_hashinfo' variable can be accessed even when IPv6 is
administratively disabled via the 'ipv6.disable=1' kernel command line
option, leading to a crash [1].

Fix by restoring the original behavior and always initializing the
variable, regardless of IPv6 support being administratively disabled or
not.

[1]
 BUG: unable to handle page fault for address: ffffffffffffffc8
 #PF: supervisor read access in kernel mode
 #PF: error_code(0x0000) - not-present page
 PGD 173e18067 P4D 173e18067 PUD 173e1a067 PMD 0
 Oops: 0000 [#1] PREEMPT SMP KASAN
 CPU: 3 PID: 271 Comm: ss Not tainted 6.0.0-rc4-custom-00136-g0727a9a5fbc1 #1396
 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-1.fc36 04/01/2014
 RIP: 0010:raw_diag_dump+0x310/0x7f0
 [...]
 Call Trace:
  <TASK>
  __inet_diag_dump+0x10f/0x2e0
  netlink_dump+0x575/0xfd0
  __netlink_dump_start+0x67b/0x940
  inet_diag_handler_cmd+0x273/0x2d0
  sock_diag_rcv_msg+0x317/0x440
  netlink_rcv_skb+0x15e/0x430
  sock_diag_rcv+0x2b/0x40
  netlink_unicast+0x53b/0x800
  netlink_sendmsg+0x945/0xe60
  ____sys_sendmsg+0x747/0x960
  ___sys_sendmsg+0x13a/0x1e0
  __sys_sendmsg+0x118/0x1e0
  do_syscall_64+0x34/0x80
  entry_SYSCALL_64_after_hwframe+0x63/0xcd

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Fixes: 0daf07e527 ("raw: convert raw sockets to RCU")
Reported-by: Roberto Ricci <rroberto2r@gmail.com>
Tested-by: Roberto Ricci <rroberto2r@gmail.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20220916084821.229287-1-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-09-20 11:27:32 -07:00
arch ARM: SoC fixes for 6.0 2022-09-05 17:44:48 -04:00
block block-6.0-2022-08-26 2022-08-26 11:05:54 -07:00
certs Kbuild updates for v5.20 2022-08-10 10:40:41 -07:00
crypto crypto: blake2b: effectively disable frame size warning 2022-08-10 17:59:11 -07:00
Documentation Documentation: mptcp: fix pm_type formatting 2022-09-13 10:18:44 +02:00
drivers net: enetc: deny offload of tc-based TSN features on VF interfaces 2022-09-20 11:27:10 -07:00
fs Networking fixes for 6.0-rc5, including fixes from rxrpc, netfilter, 2022-09-08 08:15:01 -04:00
include bluetooth pull request for net: 2022-09-19 18:01:04 -07:00
init arm64 fixes for -rc3 2022-08-26 11:32:53 -07:00
io_uring io_uring-6.0-2022-09-02 2022-09-02 16:37:01 -07:00
ipc Updates to various subsystems which I help look after. lib, ocfs2, 2022-08-07 10:03:24 -07:00
kernel Networking fixes for 6.0-rc4, including fixes from bluetooth, bpf 2022-09-01 09:20:42 -07:00
lib This push fixes a boot performance regression due to an unnecessary 2022-08-31 09:47:06 -07:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm mm: pagewalk: Fix race between unmap and page walker 2022-09-03 10:13:13 -07:00
net ipv6: Fix crash when IPv6 is administratively disabled 2022-09-20 11:27:32 -07:00
samples Tracing updates for 5.20 / 6.0 2022-08-05 09:41:12 -07:00
scripts Makefile.extrawarn: re-enable -Wformat for clang; take 2 2022-09-04 11:15:50 -07:00
security Landlock fix for v6.0-rc4 2022-09-02 15:24:08 -07:00
sound ALSA: usb-audio: Add quirk for LH Labs Geek Out HD Audio 1V5 2022-08-28 09:42:14 +02:00
tools wireguard: selftests: do not install headers on UML 2022-09-20 11:26:14 -07:00
usr Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
virt KVM: Drop unnecessary initialization of "ops" in kvm_ioctl_create_device() 2022-08-19 04:05:43 -04:00
.clang-format PCI/DOE: Add DOE mailbox support functions 2022-07-19 15:38:04 -07:00
.cocciconfig
.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 kbuild: split the second line of *.mod into *.usyms 2022-05-08 03:16:59 +09:00
.mailmap .mailmap: update Luca Ceresoli's e-mail address 2022-08-28 14:02:46 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS drm for 5.20/6.0 2022-08-03 19:52:08 -07:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: gve: update developers 2022-09-19 15:01:47 -07:00
Makefile Linux 6.0-rc4 2022-09-04 13:10:01 -07:00
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.