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Michael Kelley 3e876ea92c Drivers: hv: vmbus: Prevent load re-ordering when reading ring buffer 
[ Upstream commit b6cae15b57 ]

When reading a packet from a host-to-guest ring buffer, there is no
memory barrier between reading the write index (to see if there is
a packet to read) and reading the contents of the packet. The Hyper-V
host uses store-release when updating the write index to ensure that
writes of the packet data are completed first. On the guest side,
the processor can reorder and read the packet data before the write
index, and sometimes get stale packet data. Getting such stale packet
data has been observed in a reproducible case in a VM on ARM64.

Fix this by using virt_load_acquire() to read the write index,
ensuring that reads of the packet data cannot be reordered
before it. Preventing such reordering is logically correct, and
with this change, getting stale data can no longer be reproduced.

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Link: https://lore.kernel.org/r/1648394710-33480-1-git-send-email-mikelley@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-04-20 09:08:31 +02:00
arch arm64: module: remove (NOLOAD) from linker script 2022-04-20 09:08:30 +02:00
block block: bio-integrity: Advance seed correctly for larger interval sizes 2022-02-08 18:16:28 +01:00
certs certs: Trigger creation of RSA module signing key if it's not an RSA key 2021-09-22 11:45:19 +02:00
crypto crypto: authenc - Fix sleep in atomic context in decrypt_tail 2022-04-20 09:08:12 +02:00
Documentation Documentation: update stable tree link 2022-04-20 09:08:09 +02:00
drivers Drivers: hv: vmbus: Prevent load re-ordering when reading ring buffer 2022-04-20 09:08:31 +02:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:20:30 +01:00
fs cifs: potential buffer overflow in handling symlinks 2022-04-20 09:08:31 +02:00
include xfrm: policy: match with both mark and mask on user interfaces 2022-04-20 09:08:31 +02:00
init init/main.c: return 1 from handled __setup() functions 2022-04-20 09:08:28 +02:00
ipc ipc: WARN if trying to remove ipc object which is absent 2021-12-08 08:46:53 +01:00
kernel cgroup: Use open-time cgroup namespace for process migration perm checks 2022-04-20 09:08:30 +02:00
lib lib/test: use after free in register_test_dev_kmod() 2022-04-20 09:08:21 +02:00
mm mm: don't skip swap entry even if zap_details specified 2022-04-20 09:08:30 +02:00
net nfc: nci: add flush_workqueue to prevent uaf 2022-04-20 09:08:31 +02:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-26 11:40:31 +01:00
scripts Makefile.extrawarn: Move -Wunaligned-access to W=1 2022-02-23 11:57:32 +01:00
security Fix incorrect type in assignment of ipv6 port for audit 2022-04-20 09:08:21 +02:00
sound ASoC: topology: Allow TLV control to be either read or write 2022-04-20 09:08:25 +02:00
tools tools build: Use $(shell ) instead of `` to get embedded libperl's ccopts 2022-04-20 09:08:30 +02:00
usr initramfs: restore default compression behavior 2020-04-13 10:34:19 +02:00
virt KVM: Prevent module exit until all VMs are freed 2022-04-20 09:08:24 +02:00
.cocciconfig
.get_maintainer.ignore
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.gitignore kbuild: rpm-pkg: keep spec file until make mrproper 2018-02-13 10:19:46 +01:00
.mailmap .mailmap: Add Maciej W. Rozycki's Imagination e-mail address 2017-11-10 12:16:15 -08:00
COPYING
CREDITS MAINTAINERS: update TPM driver infrastructure changes 2017-11-09 17:58:40 -08:00
Kbuild License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS MAINTAINERS: Update drm/i915 bug filing URL 2020-02-28 16:36:12 +01:00
Makefile Linux 4.14.275 2022-04-02 12:41:10 +02:00
README

README 

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

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.