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Filename Latest commit message Latest commit date
Sean Christopherson c841dfce0b KVM: nVMX: Snapshot pre-VM-Enter BNDCFGS for !nested_run_pending case 
commit fa578398a0ba2c079fa1170da21fa5baae0cedb2 upstream.

If a nested run isn't pending, snapshot vmcs01.GUEST_BNDCFGS irrespective
of whether or not VM_ENTRY_LOAD_BNDCFGS is set in vmcs12.  When restoring
nested state, e.g. after migration, without a nested run pending,
prepare_vmcs02() will propagate nested.vmcs01_guest_bndcfgs to vmcs02,
i.e. will load garbage/zeros into vmcs02.GUEST_BNDCFGS.

If userspace restores nested state before MSRs, then loading garbage is a
non-issue as loading BNDCFGS will also update vmcs02.  But if usersepace
restores MSRs first, then KVM is responsible for propagating L2's value,
which is actually thrown into vmcs01, into vmcs02.

Restoring L2 MSRs into vmcs01, i.e. loading all MSRs before nested state
is all kinds of bizarre and ideally would not be supported.  Sadly, some
VMMs do exactly that and rely on KVM to make things work.

Note, there's still a lurking SMM bug, as propagating vmcs01.GUEST_BNDFGS
to vmcs02 across RSM may corrupt L2's BNDCFGS.  But KVM's entire VMX+SMM
emulation is flawed as SMI+RSM should not toouch _any_ VMCS when use the
"default treatment of SMIs", i.e. when not using an SMI Transfer Monitor.

Link: https://lore.kernel.org/all/Yobt1XwOfb5M6Dfa@google.com
Fixes: 62cf9bd811 ("KVM: nVMX: Fix emulation of VM_ENTRY_LOAD_BNDCFGS")
Cc: stable@vger.kernel.org
Cc: Lei Wang <lei4.wang@intel.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220614215831.3762138-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-08-25 11:17:19 +02:00
arch KVM: nVMX: Snapshot pre-VM-Enter BNDCFGS for !nested_run_pending case 2022-08-25 11:17:19 +02:00
block
certs
crypto
Documentation x86/speculation: Add RSB VM Exit protections 2022-08-11 12:57:53 +02:00
drivers HID: wacom: Don't register pad_input for touch switch 2022-08-25 11:17:19 +02:00
fs
include add barriers to buffer_uptodate and set_buffer_uptodate 2022-08-25 11:17:18 +02:00
init
ipc
kernel
lib
LICENSES
mm
net
samples
scripts
security
sound ALSA: bcd2000: Fix a UAF bug on the error path of probing 2022-08-25 11:17:17 +02:00
tools x86/speculation: Add RSB VM Exit protections 2022-08-11 12:57:53 +02:00
usr
virt KVM: Don't null dereference ops->destroy 2022-08-11 12:57:52 +02:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS
Makefile Makefile: link with -z noexecstack --no-warn-rwx-segments 2022-08-25 11:17:17 +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.