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Filename Latest commit message Latest commit date
Sean Christopherson 5f2093be36 KVM: Use kvm_pfn_t for local PFN variable in hva_to_pfn_remapped() 
commit a9545779ee9e9e103648f6f2552e73cfe808d0f4 upstream.

Use kvm_pfn_t, a.k.a. u64, for the local 'pfn' variable when retrieving
a so called "remapped" hva/pfn pair.  In theory, the hva could resolve to
a pfn in high memory on a 32-bit kernel.

This bug was inadvertantly exposed by commit bd2fae8da794 ("KVM: do not
assume PTE is writable after follow_pfn"), which added an error PFN value
to the mix, causing gcc to comlain about overflowing the unsigned long.

  arch/x86/kvm/../../../virt/kvm/kvm_main.c: In function ‘hva_to_pfn_remapped’:
  include/linux/kvm_host.h:89:30: error: conversion from ‘long long unsigned int’
                                  to ‘long unsigned int’ changes value from
                                  ‘9218868437227405314’ to ‘2’ [-Werror=overflow]
   89 | #define KVM_PFN_ERR_RO_FAULT (KVM_PFN_ERR_MASK + 2)
      |                              ^
virt/kvm/kvm_main.c:1935:9: note: in expansion of macro ‘KVM_PFN_ERR_RO_FAULT’

Cc: stable@vger.kernel.org
Fixes: add6a0cd1c ("KVM: MMU: try to fix up page faults before giving up")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210208201940.1258328-1-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-02-26 10:10:28 +01:00
arch arm64: tegra: Add power-domain for Tegra210 HDA 2021-02-26 10:10:27 +01:00
block
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Documentation
drivers usb: quirks: add quirk to start video capture on ELMO L-12F document camera reliable 2021-02-26 10:10:27 +01:00
fs mm: provide a saner PTE walking API for modules 2021-02-26 10:10:28 +01:00
include mm: provide a saner PTE walking API for modules 2021-02-26 10:10:28 +01:00
init
ipc
kernel bpf: Fix truncation handling for mod32 dst reg wrt zero 2021-02-26 10:10:26 +01:00
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mm mm: provide a saner PTE walking API for modules 2021-02-26 10:10:28 +01:00
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scripts scripts: set proper OpenSSL include dir also for sign-file 2021-02-26 10:10:27 +01:00
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virt KVM: Use kvm_pfn_t for local PFN variable in hva_to_pfn_remapped() 2021-02-26 10:10:28 +01:00
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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.