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Eric Dumazet 6cd9bd2a2d udp: annotate data races around unix_sk(sk)->gso_size commit `18a419bad6` upstream. Accesses to unix_sk(sk)->gso_size are lockless. Add READ_ONCE()/WRITE_ONCE() around them. BUG: KCSAN: data-race in udp_lib_setsockopt / udpv6_sendmsg write to 0xffff88812d78f47c of 2 bytes by task 10849 on cpu 1: udp_lib_setsockopt+0x3b3/0x710 net/ipv4/udp.c:2696 udpv6_setsockopt+0x63/0x90 net/ipv6/udp.c:1630 sock_common_setsockopt+0x5d/0x70 net/core/sock.c:3265 __sys_setsockopt+0x18f/0x200 net/socket.c:2104 __do_sys_setsockopt net/socket.c:2115 [inline] __se_sys_setsockopt net/socket.c:2112 [inline] __x64_sys_setsockopt+0x62/0x70 net/socket.c:2112 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88812d78f47c of 2 bytes by task 10852 on cpu 0: udpv6_sendmsg+0x161/0x16b0 net/ipv6/udp.c:1299 inet6_sendmsg+0x5f/0x80 net/ipv6/af_inet6.c:642 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg net/socket.c:674 [inline] ____sys_sendmsg+0x360/0x4d0 net/socket.c:2337 ___sys_sendmsg net/socket.c:2391 [inline] __sys_sendmmsg+0x315/0x4b0 net/socket.c:2477 __do_sys_sendmmsg net/socket.c:2506 [inline] __se_sys_sendmmsg net/socket.c:2503 [inline] __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2503 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000 -> 0x0005 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 10852 Comm: syz-executor.0 Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Fixes: `bec1f6f697` ("udp: generate gso with UDP_SEGMENT") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Willem de Bruijn <willemb@google.com> Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2021-07-25 14:36:22 +02:00
arch	bpf: Track subprog poke descriptors correctly and fix use-after-free	2021-07-25 14:36:21 +02:00
block	partitions: msdos: fix one-byte get_unaligned()	2021-07-20 16:05:39 +02:00
certs	certs: add 'x509_revocation_list' to gitignore	2021-07-20 16:05:35 +02:00
crypto	crypto: sm2 - fix a memory leak in sm2	2021-07-14 16:56:06 +02:00
Documentation	dt-bindings: i2c: at91: fix example for scl-gpios	2021-07-20 16:05:56 +02:00
drivers	drm/panel: nt35510: Do not fail if DSI read fails	2021-07-25 14:36:21 +02:00
fs	f2fs: Show casefolding support only when supported	2021-07-25 14:36:17 +02:00
include	bpf: Track subprog poke descriptors correctly and fix use-after-free	2021-07-25 14:36:21 +02:00
init	sched/core: Initialize the idle task with preemption disabled	2021-07-14 16:55:50 +02:00
ipc	ipc/mqueue, msg, sem: avoid relying on a stack reference past its expiry	2021-05-26 12:06:54 +02:00
kernel	bpf: Track subprog poke descriptors correctly and fix use-after-free	2021-07-25 14:36:21 +02:00
lib	lib/decompress_unlz4.c: correctly handle zero-padding around initrds.	2021-07-20 16:05:46 +02:00
LICENSES	LICENSES/deprecated: add Zlib license text	2020-09-16 14:33:49 +02:00
mm	Revert "mm/shmem: fix shmem_swapin() race with swapoff"	2021-07-25 14:36:20 +02:00
net	udp: annotate data races around unix_sk(sk)->gso_size	2021-07-25 14:36:22 +02:00
samples	samples/bpf: Fix the error return code of xdp_redirect's main()	2021-07-14 16:56:23 +02:00
scripts	kbuild: mkcompile_h: consider timestamp if KBUILD_BUILD_TIMESTAMP is set	2021-07-25 14:36:16 +02:00
security	smackfs: restrict bytes count in smk_set_cipso()	2021-07-19 09:45:03 +02:00
sound	ALSA: isa: Fix error return code in snd_cmi8330_probe()	2021-07-20 16:05:53 +02:00
tools	perf test bpf: Free obj_buf	2021-07-25 14:36:21 +02:00
usr	Merge branch 'work.fdpic' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-08-07 13:29:39 -07:00
virt	KVM: mmio: Fix use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio	2021-07-20 16:05:35 +02:00
.clang-format	RDMA 5.10 pull request	2020-10-17 11:18:18 -07:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	kbuild: generate Module.symvers only when vmlinux exists	2021-05-19 10:12:59 +02:00
.mailmap	mailmap: add two more addresses of Uwe Kleine-König	2020-12-06 10:19:07 -08:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Move Jason Cooper to CREDITS	2020-11-30 10:20:34 +01:00
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	f2fs: move ioctl interface definitions to separated file	2021-05-19 10:13:00 +02:00
Makefile	kbuild: do not suppress Kconfig prompts for silent build	2021-07-25 14:36:20 +02:00
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.