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David Woodhouse 2efd61a608 KVM: Warn if mark_page_dirty() is called without an active vCPU

The various kvm_write_guest() and mark_page_dirty() functions must only
ever be called in the context of an active vCPU, because if dirty ring
tracking is enabled it may simply oops when kvm_get_running_vcpu()
returns NULL for the vcpu and then kvm_dirty_ring_get() dereferences it.

This oops was reported by "butt3rflyh4ck" <butterflyhuangxx@gmail.com> in
https://lore.kernel.org/kvm/CAFcO6XOmoS7EacN_n6v4Txk7xL7iqRa2gABg3F7E3Naf5uG94g@mail.gmail.com/

That actual bug will be fixed under separate cover but this warning
should help to prevent new ones from being added.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Message-Id: <20211210163625.2886-2-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

2022-01-07 10:44:44 -05:00

arch

x86/kvm: Silence per-cpu pr_info noise about KVM clocks and steal time

2022-01-07 10:44:43 -05:00

block

block: call rq_qos_done() before ref check in batch completions

2021-11-26 09:53:23 -07:00

certs

certs: Add support for using elliptic curve keys for signing modules

2021-08-23 19:55:42 +03:00

crypto

Merge tag 'zstd-for-linus-v5.16' of git://github.com/terrelln/linux

2021-11-13 15:32:30 -08:00

Documentation

Merge tag 'kvm-s390-next-5.17-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD

2021-12-21 12:59:53 -05:00

drivers

Merge tag 'for-5.16/parisc-6' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

2021-12-05 12:58:18 -08:00

Merge tag 'xfs-5.16-fixes-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux

2021-12-04 17:22:53 -08:00

include

KVM: Warn if mark_page_dirty() is called without an active vCPU

2022-01-07 10:44:44 -05:00

init

kbuild: Fix -Wimplicit-fallthrough=5 error for GCC 5.x and 6.x

2021-11-14 18:59:49 -08:00

ipc

shm: extend forced shm destroy to support objects from several IPC nses

2021-11-20 10:35:54 -08:00

kernel

Merge tag 'timers_urgent_for_v5.16_rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2021-12-05 08:58:52 -08:00

lib

siphash: use _unaligned version by default

2021-11-29 19:50:50 -08:00

LICENSES

LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes"

2021-07-15 06:31:24 -06:00

Merge tag 'folio-5.16b' of git://git.infradead.org/users/willy/pagecache

2021-11-25 10:13:56 -08:00

net

Merge tag 'net-5.16-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2021-12-02 11:22:06 -08:00

samples

Merge tag 's390-5.16-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

2021-11-20 10:55:50 -08:00

scripts

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid

2021-11-24 09:44:13 -08:00

security

selinux: fix NULL-pointer dereference when hashtab allocation fails

2021-11-19 16:11:39 -05:00

sound

Merge tag 'sound-5.16-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound

2021-12-01 10:07:39 -08:00

tools

selftests: KVM: sev_migrate_tests: Add mirror command tests

2022-01-07 10:44:38 -05:00

usr

initramfs: Check timestamp to prevent broken cpio archive

2021-10-24 13:48:40 +09:00

virt

KVM: Warn if mark_page_dirty() is called without an active vCPU

2022-01-07 10:44:44 -05:00

.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

MAINTAINERS: Update Anup's email address

2022-01-06 15:18:22 +05:30

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

MAINTAINERS: Update Anup's email address

2022-01-06 15:18:22 +05:30

Makefile

Linux 5.16-rc4

2021-12-05 14:08:22 -08:00

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.