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Tung Nguyen ab04570d82 tipc: fix race condition causing hung sendto [ Upstream commit `bfd07f3dd4` ] When sending multicast messages via blocking socket, if sending link is congested (tsk->cong_link_cnt is set to 1), the sending thread will be put into sleeping state. However, tipc_sk_filter_rcv() is called under socket spin lock but tipc_wait_for_cond() is not. So, there is no guarantee that the setting of tsk->cong_link_cnt to 0 in tipc_sk_proto_rcv() in CPU-1 will be perceived by CPU-0. If that is the case, the sending thread in CPU-0 after being waken up, will continue to see tsk->cong_link_cnt as 1 and put the sending thread into sleeping state again. The sending thread will sleep forever. CPU-0 \| CPU-1 tipc_wait_for_cond() \| { \| // condition_ = !tsk->cong_link_cnt \| while ((rc_ = !(condition_))) { \| ... \| release_sock(sk_); \| wait_woken(); \| \| if (!sock_owned_by_user(sk)) \| tipc_sk_filter_rcv() \| { \| ... \| tipc_sk_proto_rcv() \| { \| ... \| tsk->cong_link_cnt--; \| ... \| sk->sk_write_space(sk); \| ... \| } \| ... \| } sched_annotate_sleep(); \| lock_sock(sk_); \| remove_wait_queue(); \| } \| } \| This commit fixes it by adding memory barrier to tipc_sk_proto_rcv() and tipc_wait_for_cond(). Acked-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: Tung Nguyen <tung.q.nguyen@dektech.com.au> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2019-03-10 07:17:18 +01:00
arch	x86/uaccess: Don't leak the AC flag into __put_user() value evaluation	2019-03-05 17:58:54 +01:00
block	blk-mq: fix a hung issue when fsync	2019-02-20 10:25:36 +01:00
certs	export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR()	2018-08-22 23:21:44 +09:00
crypto	net: crypto set sk to NULL when af_alg_release.	2019-02-23 09:07:24 +01:00
Documentation	dt-bindings: eeprom: at24: add "atmel,24c2048" compatible string	2019-02-20 10:25:35 +01:00
drivers	net: phy: phylink: fix uninitialized variable in phylink_get_mac_state	2019-03-10 07:17:18 +01:00
firmware	kbuild: remove all dummy assignments to obj-	2017-11-18 11:46:06 +09:00
fs	hugetlbfs: fix races and page leaks during migration	2019-03-05 17:58:53 +01:00
include	ipv4: Add ICMPv6 support when parse route ipproto	2019-03-10 07:17:17 +01:00
init	kbuild: Disable LD_DEAD_CODE_DATA_ELIMINATION with ftrace & GCC <= 4.7	2019-01-22 21:40:34 +01:00
ipc	ipc/shm.c: use ERR_CAST() for shm_lock() error return	2018-10-05 16:32:04 -07:00
kernel	locking/rwsem: Fix (possible) missed wakeup	2019-03-05 17:58:49 +01:00
lib	lib/test_rhashtable: Make test_insert_dup() allocate its hash table dynamically	2019-02-12 19:47:21 +01:00
LICENSES	LICENSES: Remove CC-BY-SA-4.0 license text	2018-10-18 11:28:50 +02:00
mm	hugetlbfs: fix races and page leaks during migration	2019-03-05 17:58:53 +01:00
net	tipc: fix race condition causing hung sendto	2019-03-10 07:17:18 +01:00
samples	samples: mei: use /dev/mei0 instead of /dev/mei	2019-02-15 08:10:11 +01:00
scripts	scripts/gdb: fix lx-version string output	2019-02-12 19:47:20 +01:00
security	KEYS: always initialize keyring_index_key::desc_len	2019-02-27 10:09:00 +01:00
sound	ASoC: imx-audmux: change snprintf to scnprintf for possible overflow	2019-03-05 17:58:47 +01:00
tools	kvm: selftests: Fix region overlap check in kvm_util	2019-03-05 17:58:52 +01:00
usr	initramfs: move gen_initramfs_list.sh from scripts/ to usr/	2018-08-22 23:21:44 +09:00
virt	kvm: fix kvm_ioctl_create_device() reference counting (CVE-2019-6974)	2019-02-12 19:47:25 +01:00
.clang-format	clang-format: Set IndentWrappedFunctionNames false	2018-08-01 18:38:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes	.gitattributes: set git diff driver for C source code files	2016-10-07 18:46:30 -07:00
.gitignore	Kbuild updates for v4.17 (2nd)	2018-04-15 17:21:30 -07:00
.mailmap	libnvdimm-for-4.19_misc	2018-08-25 18:13:10 -07:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	9p: remove Ron Minnich from MAINTAINERS	2018-08-17 16:20:26 -07:00
Kbuild	Kbuild updates for v4.15	2017-11-17 17:45:29 -08:00
Kconfig	kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt	2018-08-02 08:06:55 +09:00
MAINTAINERS	MAINTAINERS: Add Sasha as a stable branch maintainer	2018-12-01 09:37:25 +01:00
Makefile	Linux 4.19.27	2019-03-05 17:58:54 +01:00
README	Docs: Added a pointer to the formatted docs to README	2018-03-21 09:02:53 -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.
See Documentation/00-INDEX for a list of what is contained in each file.

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.