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John Fastabend f8358589b3 bpf, sockmap: Re-evaluate proto ops when psock is removed from sockmap commit `c0d95d3380` upstream. When a sock is added to a sock map we evaluate what proto op hooks need to be used. However, when the program is removed from the sock map we have not been evaluating if that changes the required program layout. Before the patch listed in the 'fixes' tag this was not causing failures because the base program set handles all cases. Specifically, the case with a stream parser and the case with out a stream parser are both handled. With the fix below we identified a race when running with a proto op that attempts to read skbs off both the stream parser and the skb->receive_queue. Namely, that a race existed where when the stream parser is empty checking the skb->receive_queue from recvmsg at the precies moment when the parser is paused and the receive_queue is not empty could result in skipping the stream parser. This may break a RX policy depending on the parser to run. The fix tag then loads a specific proto ops that resolved this race. But, we missed removing that proto ops recv hook when the sock is removed from the sockmap. The result is the stream parser is stopped so no more skbs will be aggregated there, but the hook and BPF program continues to be attached on the psock. User space will then get an EBUSY when trying to read the socket because the recvmsg() handler is now waiting on a stopped stream parser. To fix we rerun the proto ops init() function which will look at the new set of progs attached to the psock and rest the proto ops hook to the correct handlers. And in the above case where we remove the sock from the sock map the RX prog will no longer be listed so the proto ops is removed. Fixes: `c5d2177a72` ("bpf, sockmap: Fix race in ingress receive verdict with redirect to self") Signed-off-by: John Fastabend <john.fastabend@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20211119181418.353932-3-john.fastabend@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-12-14 10:57:18 +01:00
arch	KVM: x86: Wait for IPIs to be delivered when handling Hyper-V TLB flush hypercall	2021-12-14 10:57:11 +01:00
block	block: fix ioprio_get(IOPRIO_WHO_PGRP) vs setuid(2)	2021-12-14 10:57:16 +01:00
certs	certs: Add support for using elliptic curve keys for signing modules	2021-08-23 19:55:42 +03:00
crypto	crypto: pcrypt - Delay write to padata->info	2021-11-18 19:16:44 +01:00
Documentation	docs: accounting: update delay-accounting.rst reference	2021-12-01 09:04:56 +01:00
drivers	mtd: rawnand: fsmc: Fix timing computation	2021-12-14 10:57:18 +01:00
fs	tracefs: Set all files to the same group ownership as the mount option	2021-12-14 10:57:15 +01:00
include	PM: runtime: Fix pm_runtime_active() kerneldoc comment	2021-12-14 10:57:16 +01:00
init	init: make unknown command line param message clearer	2021-11-18 19:17:11 +01:00
ipc	shm: extend forced shm destroy to support objects from several IPC nses	2021-11-25 09:48:42 +01:00
kernel	wait: add wake_up_pollfree()	2021-12-14 10:57:15 +01:00
lib	siphash: use _unaligned version by default	2021-12-08 09:04:47 +01:00
LICENSES	LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes"	2021-07-15 06:31:24 -06:00
mm	mm: bdi: initialize bdi_min_ratio when bdi is unregistered	2021-12-14 10:57:11 +01:00
net	bpf, sockmap: Re-evaluate proto ops when psock is removed from sockmap	2021-12-14 10:57:18 +01:00
samples	samples/bpf: Fix incorrect use of strlen in xdp_redirect_cpu	2021-11-25 09:48:33 +01:00
scripts	leaking_addresses: Always print a trailing newline	2021-11-18 19:16:16 +01:00
security	selinux: fix NULL-pointer dereference when hashtab allocation fails	2021-11-25 09:49:07 +01:00
sound	ASoC: codecs: wcd934x: return correct value from mixer put	2021-12-14 10:57:17 +01:00
tools	selftests: KVM: avoid failures due to reserved HyperTransport region	2021-12-14 10:57:14 +01:00
usr	.gitignore: prefix local generated files with a slash	2021-05-02 00:43:35 +09:00
virt	KVM: Ensure local memslot copies operate on up-to-date arch-specific data	2021-12-08 09:04:43 +01:00
.clang-format	clang-format: Update with the latest for_each macro list	2021-05-12 23:32:39 +02:00
.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	.gitignore: ignore only top-level modules.builtin	2021-05-02 00:43:35 +09:00
.mailmap	mailmap: add Andrej Shadura	2021-10-18 20:22:03 -10:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Move Daniel Drake to credits	2021-09-21 08:34:58 +03:00
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	drm fixes for 5.15 final	2021-10-28 12:17:01 -07:00
Makefile	Linux 5.15.7	2021-12-08 09:04:57 +01:00
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.