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Wang Yufen bec34a91eb bpf, sockmap: Fix memleak in tcp_bpf_sendmsg while sk msg is full [ Upstream commit `9c34e38c4a` ] If tcp_bpf_sendmsg() is running while sk msg is full. When sk_msg_alloc() returns -ENOMEM error, tcp_bpf_sendmsg() goes to wait_for_memory. If partial memory has been alloced by sk_msg_alloc(), that is, msg_tx->sg.size is greater than osize after sk_msg_alloc(), memleak occurs. To fix we use sk_msg_trim() to release the allocated memory, then goto wait for memory. Other call paths of sk_msg_alloc() have the similar issue, such as tls_sw_sendmsg(), so handle sk_msg_trim logic inside sk_msg_alloc(), as Cong Wang suggested. This issue can cause the following info: WARNING: CPU: 3 PID: 7950 at net/core/stream.c:208 sk_stream_kill_queues+0xd4/0x1a0 Call Trace: <TASK> inet_csk_destroy_sock+0x55/0x110 __tcp_close+0x279/0x470 tcp_close+0x1f/0x60 inet_release+0x3f/0x80 __sock_release+0x3d/0xb0 sock_close+0x11/0x20 __fput+0x92/0x250 task_work_run+0x6a/0xa0 do_exit+0x33b/0xb60 do_group_exit+0x2f/0xa0 get_signal+0xb6/0x950 arch_do_signal_or_restart+0xac/0x2a0 exit_to_user_mode_prepare+0xa9/0x200 syscall_exit_to_user_mode+0x12/0x30 do_syscall_64+0x46/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae </TASK> WARNING: CPU: 3 PID: 2094 at net/ipv4/af_inet.c:155 inet_sock_destruct+0x13c/0x260 Call Trace: <TASK> __sk_destruct+0x24/0x1f0 sk_psock_destroy+0x19b/0x1c0 process_one_work+0x1b3/0x3c0 kthread+0xe6/0x110 ret_from_fork+0x22/0x30 </TASK> Fixes: `604326b41a` ("bpf, sockmap: convert to generic sk_msg interface") Signed-off-by: Wang Yufen <wangyufen@huawei.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: John Fastabend <john.fastabend@gmail.com> Link: https://lore.kernel.org/bpf/20220304081145.2037182-3-wangyufen@huawei.com Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-04-08 14:40:21 +02:00
arch	MIPS: pgalloc: fix memory leak caused by pgd_free()	2022-04-08 14:40:21 +02:00
block	block: don't delete queue kobject before its children	2022-04-08 14:40:00 +02:00
certs	certs: Trigger creation of RSA module signing key if it's not an RSA key	2021-09-15 09:50:29 +02:00
crypto	crypto: authenc - Fix sleep in atomic context in decrypt_tail	2022-04-08 14:39:59 +02:00
Documentation	Documentation: update stable tree link	2022-04-08 14:39:50 +02:00
drivers	RDMA/mlx5: Fix memory leak in error flow for subscribe event routine	2022-04-08 14:40:21 +02:00
fs	ext2: correct max file size computing	2022-04-08 14:40:18 +02:00
include	PCI: Reduce warnings on possible RW1C corruption	2022-04-08 14:40:19 +02:00
init	bpf: Add kconfig knob for disabling unpriv bpf by default	2022-01-05 12:40:34 +01:00
ipc	shm: extend forced shm destroy to support objects from several IPC nses	2021-12-01 09:19:10 +01:00
kernel	livepatch: Fix build failure on 32 bits processors	2022-04-08 14:40:15 +02:00
lib	kunit: make kunit_test_timeout compatible with comment	2022-04-08 14:40:04 +02:00
LICENSES	LICENSES/deprecated: add Zlib license text	2020-09-16 14:33:49 +02:00
mm	mm/kmemleak: reset tag when compare object pointer	2022-04-08 14:39:54 +02:00
net	bpf, sockmap: Fix memleak in tcp_bpf_sendmsg while sk msg is full	2022-04-08 14:40:21 +02:00
samples	ftrace/samples: Add missing prototypes direct functions	2022-01-11 15:25:00 +01:00
scripts	scripts/dtc: Call pkg-config POSIXly correct	2022-04-08 14:40:15 +02:00
security	TOMOYO: fix __setup handlers return values	2022-04-08 14:40:18 +02:00
sound	ASoC: codecs: wcd934x: Add missing of_node_put() in wcd934x_codec_parse_data	2022-04-08 14:40:11 +02:00
tools	selftests/bpf: Make test_lwt_ip_encap more stable and faster	2022-04-08 14:40:20 +02:00
usr	usr/include/Makefile: add linux/nfc.h to the compile-test coverage	2022-02-01 17:25:48 +01:00
virt	KVM: eventfd: Fix false positive RCU usage warning	2022-02-16 12:54:20 +01:00
.clang-format	RDMA 5.10 pull request	2020-10-17 11:18:18 -07:00
.cocciconfig
.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	MAINTAINERS: adjust GCC PLUGINS after gcc-plugin.sh removal	2021-12-14 11:32:46 +01:00
Makefile	Linux 5.10.109	2022-03-28 09:57:11 +02:00
README

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.