1. 27 Mar, 2017 6 commits
  2. 23 Mar, 2017 7 commits
  3. 21 Mar, 2017 2 commits
  4. 20 Mar, 2017 8 commits
    • Kyle Huey's avatar
      x86/arch_prctl: Add ARCH_[GET|SET]_CPUID · e9ea1e7f
      Kyle Huey authored
      Intel supports faulting on the CPUID instruction beginning with Ivy Bridge.
      When enabled, the processor will fault on attempts to execute the CPUID
      instruction with CPL>0. Exposing this feature to userspace will allow a
      ptracer to trap and emulate the CPUID instruction.
      
      When supported, this feature is controlled by toggling bit 0 of
      MSR_MISC_FEATURES_ENABLES. It is documented in detail in Section 2.3.2 of
      https://bugzilla.kernel.org/attachment.cgi?id=243991
      
      Implement a new pair of arch_prctls, available on both x86-32 and x86-64.
      
      ARCH_GET_CPUID: Returns the current CPUID state, either 0 if CPUID faulting
          is enabled (and thus the CPUID instruction is not available) or 1 if
          CPUID faulting is not enabled.
      
      ARCH_SET_CPUID: Set the CPUID state to the second argument. If
          cpuid_enabled is 0 CPUID faulting will be activated, otherwise it will
          be deactivated. Returns ENODEV if CPUID faulting is not supported on
          this system.
      
      The state of the CPUID faulting flag is propagated across forks, but reset
      upon exec.
      Signed-off-by: default avatarKyle Huey <khuey@kylehuey.com>
      Cc: Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com>
      Cc: kvm@vger.kernel.org
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: linux-kselftest@vger.kernel.org
      Cc: Nadav Amit <nadav.amit@gmail.com>
      Cc: Robert O'Callahan <robert@ocallahan.org>
      Cc: Richard Weinberger <richard@nod.at>
      Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Len Brown <len.brown@intel.com>
      Cc: Shuah Khan <shuah@kernel.org>
      Cc: user-mode-linux-devel@lists.sourceforge.net
      Cc: Jeff Dike <jdike@addtoit.com>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: user-mode-linux-user@lists.sourceforge.net
      Cc: David Matlack <dmatlack@google.com>
      Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
      Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
      Cc: linux-fsdevel@vger.kernel.org
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Link: http://lkml.kernel.org/r/20170320081628.18952-9-khuey@kylehuey.comSigned-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      e9ea1e7f
    • Kyle Huey's avatar
      x86/cpufeature: Detect CPUID faulting support · 90218ac7
      Kyle Huey authored
      Intel supports faulting on the CPUID instruction beginning with Ivy Bridge.
      When enabled, the processor will fault on attempts to execute the CPUID
      instruction with CPL>0. This will allow a ptracer to emulate the CPUID
      instruction.
      
      Bit 31 of MSR_PLATFORM_INFO advertises support for this feature. It is
      documented in detail in Section 2.3.2 of
      https://bugzilla.kernel.org/attachment.cgi?id=243991
      
      Detect support for this feature and expose it as X86_FEATURE_CPUID_FAULT.
      Signed-off-by: default avatarKyle Huey <khuey@kylehuey.com>
      Reviewed-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com>
      Cc: kvm@vger.kernel.org
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: linux-kselftest@vger.kernel.org
      Cc: Nadav Amit <nadav.amit@gmail.com>
      Cc: Robert O'Callahan <robert@ocallahan.org>
      Cc: Richard Weinberger <richard@nod.at>
      Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Len Brown <len.brown@intel.com>
      Cc: Shuah Khan <shuah@kernel.org>
      Cc: user-mode-linux-devel@lists.sourceforge.net
      Cc: Jeff Dike <jdike@addtoit.com>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: user-mode-linux-user@lists.sourceforge.net
      Cc: David Matlack <dmatlack@google.com>
      Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
      Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
      Cc: linux-fsdevel@vger.kernel.org
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Link: http://lkml.kernel.org/r/20170320081628.18952-8-khuey@kylehuey.comSigned-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      90218ac7
    • Kyle Huey's avatar
      x86/syscalls/32: Wire up arch_prctl on x86-32 · 79170fda
      Kyle Huey authored
      Hook up arch_prctl to call do_arch_prctl() on x86-32, and in 32 bit compat
      mode on x86-64. This allows to have arch_prctls that are not specific to 64
      bits.
      
      On UML, simply stub out this syscall.
      Signed-off-by: default avatarKyle Huey <khuey@kylehuey.com>
      Cc: Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com>
      Cc: kvm@vger.kernel.org
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: linux-kselftest@vger.kernel.org
      Cc: Nadav Amit <nadav.amit@gmail.com>
      Cc: Robert O'Callahan <robert@ocallahan.org>
      Cc: Richard Weinberger <richard@nod.at>
      Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Len Brown <len.brown@intel.com>
      Cc: Shuah Khan <shuah@kernel.org>
      Cc: user-mode-linux-devel@lists.sourceforge.net
      Cc: Jeff Dike <jdike@addtoit.com>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: user-mode-linux-user@lists.sourceforge.net
      Cc: David Matlack <dmatlack@google.com>
      Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
      Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
      Cc: linux-fsdevel@vger.kernel.org
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Link: http://lkml.kernel.org/r/20170320081628.18952-7-khuey@kylehuey.comSigned-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      79170fda
    • Kyle Huey's avatar
      x86/arch_prctl: Add do_arch_prctl_common() · b0b9b014
      Kyle Huey authored
      Add do_arch_prctl_common() to handle arch_prctls that are not specific to 64
      bit mode. Call it from the syscall entry point, but not any of the other
      callsites in the kernel, which all want one of the existing 64 bit only
      arch_prctls.
      Signed-off-by: default avatarKyle Huey <khuey@kylehuey.com>
      Cc: Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com>
      Cc: kvm@vger.kernel.org
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: linux-kselftest@vger.kernel.org
      Cc: Nadav Amit <nadav.amit@gmail.com>
      Cc: Robert O'Callahan <robert@ocallahan.org>
      Cc: Richard Weinberger <richard@nod.at>
      Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Len Brown <len.brown@intel.com>
      Cc: Shuah Khan <shuah@kernel.org>
      Cc: user-mode-linux-devel@lists.sourceforge.net
      Cc: Jeff Dike <jdike@addtoit.com>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: user-mode-linux-user@lists.sourceforge.net
      Cc: David Matlack <dmatlack@google.com>
      Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
      Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
      Cc: linux-fsdevel@vger.kernel.org
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Link: http://lkml.kernel.org/r/20170320081628.18952-6-khuey@kylehuey.comSigned-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      b0b9b014
    • Kyle Huey's avatar
      x86/arch_prctl/64: Rename do_arch_prctl() to do_arch_prctl_64() · 17a6e1b8
      Kyle Huey authored
      In order to introduce new arch_prctls that are not 64 bit only, rename the
      existing 64 bit implementation to do_arch_prctl_64(). Also rename the
      second argument of that function from 'addr' to 'arg2', because it will no
      longer always be an address.
      Signed-off-by: default avatarKyle Huey <khuey@kylehuey.com>
      Reviewed-by: default avatarAndy Lutomirski <luto@kernel.org>
      Cc: Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com>
      Cc: kvm@vger.kernel.org
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: linux-kselftest@vger.kernel.org
      Cc: Nadav Amit <nadav.amit@gmail.com>
      Cc: Robert O'Callahan <robert@ocallahan.org>
      Cc: Richard Weinberger <richard@nod.at>
      Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Len Brown <len.brown@intel.com>
      Cc: Shuah Khan <shuah@kernel.org>
      Cc: user-mode-linux-devel@lists.sourceforge.net
      Cc: Jeff Dike <jdike@addtoit.com>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: user-mode-linux-user@lists.sourceforge.net
      Cc: David Matlack <dmatlack@google.com>
      Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
      Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
      Cc: linux-fsdevel@vger.kernel.org
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Link: http://lkml.kernel.org/r/20170320081628.18952-5-khuey@kylehuey.comSigned-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      17a6e1b8
    • Kyle Huey's avatar
      x86/arch_prctl/64: Use SYSCALL_DEFINE2 to define sys_arch_prctl() · ff3f097e
      Kyle Huey authored
      Use the SYSCALL_DEFINE2 macro instead of manually defining it.
      Signed-off-by: default avatarKyle Huey <khuey@kylehuey.com>
      Cc: Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com>
      Cc: kvm@vger.kernel.org
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: linux-kselftest@vger.kernel.org
      Cc: Nadav Amit <nadav.amit@gmail.com>
      Cc: Robert O'Callahan <robert@ocallahan.org>
      Cc: Richard Weinberger <richard@nod.at>
      Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Len Brown <len.brown@intel.com>
      Cc: Shuah Khan <shuah@kernel.org>
      Cc: user-mode-linux-devel@lists.sourceforge.net
      Cc: Jeff Dike <jdike@addtoit.com>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: user-mode-linux-user@lists.sourceforge.net
      Cc: David Matlack <dmatlack@google.com>
      Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
      Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
      Cc: linux-fsdevel@vger.kernel.org
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Link: http://lkml.kernel.org/r/20170320081628.18952-4-khuey@kylehuey.comSigned-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      ff3f097e
    • Kyle Huey's avatar
      x86/arch_prctl: Rename 'code' argument to 'option' · dd93938a
      Kyle Huey authored
      The x86 specific arch_prctl() arbitrarily changed prctl's 'option' to
      'code'. Before adding new options, rename it.
      Signed-off-by: default avatarKyle Huey <khuey@kylehuey.com>
      Cc: Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com>
      Cc: kvm@vger.kernel.org
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: linux-kselftest@vger.kernel.org
      Cc: Nadav Amit <nadav.amit@gmail.com>
      Cc: Robert O'Callahan <robert@ocallahan.org>
      Cc: Richard Weinberger <richard@nod.at>
      Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Len Brown <len.brown@intel.com>
      Cc: Shuah Khan <shuah@kernel.org>
      Cc: user-mode-linux-devel@lists.sourceforge.net
      Cc: Jeff Dike <jdike@addtoit.com>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: user-mode-linux-user@lists.sourceforge.net
      Cc: David Matlack <dmatlack@google.com>
      Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
      Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
      Cc: linux-fsdevel@vger.kernel.org
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Link: http://lkml.kernel.org/r/20170320081628.18952-3-khuey@kylehuey.comSigned-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      dd93938a
    • Kyle Huey's avatar
      x86/msr: Rename MISC_FEATURE_ENABLES to MISC_FEATURES_ENABLES · ab6d9468
      Kyle Huey authored
      This matches the only public Intel documentation of this MSR, in the
      "Virtualization Technology FlexMigration Application Note"
      (preserved at https://bugzilla.kernel.org/attachment.cgi?id=243991)
      Signed-off-by: default avatarKyle Huey <khuey@kylehuey.com>
      Cc: Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com>
      Cc: kvm@vger.kernel.org
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: linux-kselftest@vger.kernel.org
      Cc: Nadav Amit <nadav.amit@gmail.com>
      Cc: Robert O'Callahan <robert@ocallahan.org>
      Cc: Richard Weinberger <richard@nod.at>
      Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Len Brown <len.brown@intel.com>
      Cc: Shuah Khan <shuah@kernel.org>
      Cc: user-mode-linux-devel@lists.sourceforge.net
      Cc: Jeff Dike <jdike@addtoit.com>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: user-mode-linux-user@lists.sourceforge.net
      Cc: David Matlack <dmatlack@google.com>
      Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
      Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
      Cc: linux-fsdevel@vger.kernel.org
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Link: http://lkml.kernel.org/r/20170320081628.18952-2-khuey@kylehuey.comSigned-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      ab6d9468
  5. 19 Mar, 2017 1 commit
    • Andy Lutomirski's avatar
      x86/tls: Forcibly set the accessed bit in TLS segments · 5b781c7e
      Andy Lutomirski authored
      For mysterious historical reasons, struct user_desc doesn't indicate
      whether segments are accessed.  set_thread_area() has always programmed
      segments as non-accessed, so the first write will set the accessed bit.
      This will fault if the GDT is read-only.
      
      Fix it by making TLS segments start out accessed.
      
      If this ends up breaking something, we could, in principle, leave TLS
      segments non-accessed and fix them up when we get the page fault.  I'd be
      surprised, though -- AFAIK all the nasty legacy segmented programs (DOSEMU,
      Wine, things that run on DOSEMU and Wine, etc.) do their nasty segmented
      things using the LDT and not the GDT.  I assume this is mainly because old
      OSes (Linux and otherwise) didn't historically provide APIs to do nasty
      things in the GDT.
      
      Fixes: 45fc8757 ("x86: Make the GDT remapping read-only on 64-bit")
      Signed-off-by: default avatarAndy Lutomirski <luto@kernel.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Thomas Garnier <thgarnie@google.com>
      Link: http://lkml.kernel.org/r/62b7748542df0164af7e0a5231283b9b13858c45.1489900519.git.luto@kernel.orgSigned-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      5b781c7e
  6. 18 Mar, 2017 8 commits
  7. 17 Mar, 2017 1 commit
  8. 16 Mar, 2017 6 commits
    • Linus Torvalds's avatar
      Merge tag 'xfs-4.11-fixes-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux · d11507e1
      Linus Torvalds authored
      Pull xfs fix from Darrick Wong:
       "Here's a single fix for -rc3 to improve input validation on inline
        directory data to prevent buffer overruns due to corrupt metadata"
      
      * tag 'xfs-4.11-fixes-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
        xfs: verify inline directory data forks
      d11507e1
    • Linus Torvalds's avatar
      Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux · 325513d9
      Linus Torvalds authored
      Pull arm64 fixes/cleanups from Catalin Marinas:
       "In Will's absence I'm sending the arm64 fixes he queued for 4.11-rc3:
      
         - fix arm64 kernel boot warning when DEBUG_VIRTUAL and KASAN are
           enabled
      
         - enable KEYS_COMPAT for keyctl compat support
      
         - use cpus_have_const_cap() for system_uses_ttbr0_pan() (slight
           performance improvement)
      
         - update kerneldoc for cpu_suspend() rename
      
         - remove the arm64-specific kprobe_exceptions_notify (weak generic
           variant defined)"
      
      * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
        arm64: kernel: Update kerneldoc for cpu_suspend() rename
        arm64: use const cap for system_uses_ttbr0_pan()
        arm64: support keyctl() system call in 32-bit mode
        arm64: kasan: avoid bad virt_to_pfn()
        arm64: kprobes: remove kprobe_exceptions_notify
      325513d9
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md · 3009b303
      Linus Torvalds authored
      Pull MD fixes from Shaohua Li:
      
       - fix a parity calculation bug of raid5 cache by Song
      
       - fix a potential deadlock issue by me
      
       - fix two endian issues by Jason
      
       - fix a disk limitation issue by Neil
      
       - other small fixes and cleanup
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md:
        md/raid1: fix a trivial typo in comments
        md/r5cache: fix set_syndrome_sources() for data in cache
        md: fix incorrect use of lexx_to_cpu in does_sb_need_changing
        md: fix super_offset endianness in super_1_rdev_size_change
        md/raid1/10: fix potential deadlock
        md: don't impose the MD_SB_DISKS limit on arrays without metadata.
        md: move funcs from pers->resize to update_size
        md-cluster: remove useless memset from gather_all_resync_info
        md-cluster: free md_cluster_info if node leave cluster
        md: delete dead code
        md/raid10: submit bio directly to replacement disk
      3009b303
    • Thomas Garnier's avatar
      x86: Make the GDT remapping read-only on 64-bit · 45fc8757
      Thomas Garnier authored
      This patch makes the GDT remapped pages read-only, to prevent accidental
      (or intentional) corruption of this key data structure.
      
      This change is done only on 64-bit, because 32-bit needs it to be writable
      for TSS switches.
      
      The native_load_tr_desc function was adapted to correctly handle a
      read-only GDT. The LTR instruction always writes to the GDT TSS entry.
      This generates a page fault if the GDT is read-only. This change checks
      if the current GDT is a remap and swap GDTs as needed. This function was
      tested by booting multiple machines and checking hibernation works
      properly.
      
      KVM SVM and VMX were adapted to use the writeable GDT. On VMX, the
      per-cpu variable was removed for functions to fetch the original GDT.
      Instead of reloading the previous GDT, VMX will reload the fixmap GDT as
      expected. For testing, VMs were started and restored on multiple
      configurations.
      Signed-off-by: default avatarThomas Garnier <thgarnie@google.com>
      Cc: Alexander Potapenko <glider@google.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
      Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Chris Wilson <chris@chris-wilson.co.uk>
      Cc: Christian Borntraeger <borntraeger@de.ibm.com>
      Cc: Dmitry Vyukov <dvyukov@google.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Jiri Kosina <jikos@kernel.org>
      Cc: Joerg Roedel <joro@8bytes.org>
      Cc: Jonathan Corbet <corbet@lwn.net>
      Cc: Josh Poimboeuf <jpoimboe@redhat.com>
      Cc: Juergen Gross <jgross@suse.com>
      Cc: Kees Cook <keescook@chromium.org>
      Cc: Len Brown <len.brown@intel.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Lorenzo Stoakes <lstoakes@gmail.com>
      Cc: Luis R . Rodriguez <mcgrof@kernel.org>
      Cc: Matt Fleming <matt@codeblueprint.co.uk>
      Cc: Michal Hocko <mhocko@suse.com>
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
      Cc: Pavel Machek <pavel@ucw.cz>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Cc: Rafael J . Wysocki <rjw@rjwysocki.net>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: Stanislaw Gruszka <sgruszka@redhat.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Tim Chen <tim.c.chen@linux.intel.com>
      Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
      Cc: kasan-dev@googlegroups.com
      Cc: kernel-hardening@lists.openwall.com
      Cc: kvm@vger.kernel.org
      Cc: lguest@lists.ozlabs.org
      Cc: linux-doc@vger.kernel.org
      Cc: linux-efi@vger.kernel.org
      Cc: linux-mm@kvack.org
      Cc: linux-pm@vger.kernel.org
      Cc: xen-devel@lists.xenproject.org
      Cc: zijun_hu <zijun_hu@htc.com>
      Link: http://lkml.kernel.org/r/20170314170508.100882-3-thgarnie@google.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      45fc8757
    • Thomas Garnier's avatar
      x86: Remap GDT tables in the fixmap section · 69218e47
      Thomas Garnier authored
      Each processor holds a GDT in its per-cpu structure. The sgdt
      instruction gives the base address of the current GDT. This address can
      be used to bypass KASLR memory randomization. With another bug, an
      attacker could target other per-cpu structures or deduce the base of
      the main memory section (PAGE_OFFSET).
      
      This patch relocates the GDT table for each processor inside the
      fixmap section. The space is reserved based on number of supported
      processors.
      
      For consistency, the remapping is done by default on 32 and 64-bit.
      
      Each processor switches to its remapped GDT at the end of
      initialization. For hibernation, the main processor returns with the
      original GDT and switches back to the remapping at completion.
      
      This patch was tested on both architectures. Hibernation and KVM were
      both tested specially for their usage of the GDT.
      
      Thanks to Boris Ostrovsky <boris.ostrovsky@oracle.com> for testing and
      recommending changes for Xen support.
      Signed-off-by: default avatarThomas Garnier <thgarnie@google.com>
      Cc: Alexander Potapenko <glider@google.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
      Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Chris Wilson <chris@chris-wilson.co.uk>
      Cc: Christian Borntraeger <borntraeger@de.ibm.com>
      Cc: Dmitry Vyukov <dvyukov@google.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Jiri Kosina <jikos@kernel.org>
      Cc: Joerg Roedel <joro@8bytes.org>
      Cc: Jonathan Corbet <corbet@lwn.net>
      Cc: Josh Poimboeuf <jpoimboe@redhat.com>
      Cc: Juergen Gross <jgross@suse.com>
      Cc: Kees Cook <keescook@chromium.org>
      Cc: Len Brown <len.brown@intel.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Lorenzo Stoakes <lstoakes@gmail.com>
      Cc: Luis R . Rodriguez <mcgrof@kernel.org>
      Cc: Matt Fleming <matt@codeblueprint.co.uk>
      Cc: Michal Hocko <mhocko@suse.com>
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
      Cc: Pavel Machek <pavel@ucw.cz>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Cc: Rafael J . Wysocki <rjw@rjwysocki.net>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: Stanislaw Gruszka <sgruszka@redhat.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Tim Chen <tim.c.chen@linux.intel.com>
      Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
      Cc: kasan-dev@googlegroups.com
      Cc: kernel-hardening@lists.openwall.com
      Cc: kvm@vger.kernel.org
      Cc: lguest@lists.ozlabs.org
      Cc: linux-doc@vger.kernel.org
      Cc: linux-efi@vger.kernel.org
      Cc: linux-mm@kvack.org
      Cc: linux-pm@vger.kernel.org
      Cc: xen-devel@lists.xenproject.org
      Cc: zijun_hu <zijun_hu@htc.com>
      Link: http://lkml.kernel.org/r/20170314170508.100882-2-thgarnie@google.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      69218e47
    • Thomas Garnier's avatar
      x86/mm: Adapt MODULES_END based on fixmap section size · f06bdd40
      Thomas Garnier authored
      This patch aligns MODULES_END to the beginning of the fixmap section.
      It optimizes the space available for both sections. The address is
      pre-computed based on the number of pages required by the fixmap
      section.
      
      It will allow GDT remapping in the fixmap section. The current
      MODULES_END static address does not provide enough space for the kernel
      to support a large number of processors.
      Signed-off-by: default avatarThomas Garnier <thgarnie@google.com>
      Cc: Alexander Potapenko <glider@google.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
      Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Chris Wilson <chris@chris-wilson.co.uk>
      Cc: Christian Borntraeger <borntraeger@de.ibm.com>
      Cc: Dmitry Vyukov <dvyukov@google.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Jiri Kosina <jikos@kernel.org>
      Cc: Joerg Roedel <joro@8bytes.org>
      Cc: Jonathan Corbet <corbet@lwn.net>
      Cc: Josh Poimboeuf <jpoimboe@redhat.com>
      Cc: Juergen Gross <jgross@suse.com>
      Cc: Kees Cook <keescook@chromium.org>
      Cc: Len Brown <len.brown@intel.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Lorenzo Stoakes <lstoakes@gmail.com>
      Cc: Luis R . Rodriguez <mcgrof@kernel.org>
      Cc: Matt Fleming <matt@codeblueprint.co.uk>
      Cc: Michal Hocko <mhocko@suse.com>
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
      Cc: Pavel Machek <pavel@ucw.cz>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Cc: Rafael J . Wysocki <rjw@rjwysocki.net>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: Stanislaw Gruszka <sgruszka@redhat.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Tim Chen <tim.c.chen@linux.intel.com>
      Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
      Cc: kasan-dev@googlegroups.com
      Cc: kernel-hardening@lists.openwall.com
      Cc: kvm@vger.kernel.org
      Cc: lguest@lists.ozlabs.org
      Cc: linux-doc@vger.kernel.org
      Cc: linux-efi@vger.kernel.org
      Cc: linux-mm@kvack.org
      Cc: linux-pm@vger.kernel.org
      Cc: xen-devel@lists.xenproject.org
      Cc: zijun_hu <zijun_hu@htc.com>
      Link: http://lkml.kernel.org/r/20170314170508.100882-1-thgarnie@google.com
      [ Small build fix. ]
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      f06bdd40
  9. 15 Mar, 2017 1 commit
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.dk/linux-block · 69eea5a4
      Linus Torvalds authored
      Pull block fixes from Jens Axboe:
       "Four small fixes for this cycle:
      
         - followup fix from Neil for a fix that went in before -rc2, ensuring
           that we always see the full per-task bio_list.
      
         - fix for blk-mq-sched from me that ensures that we retain similar
           direct-to-issue behavior on running the queue.
      
         - fix from Sagi fixing a potential NULL pointer dereference in blk-mq
           on spurious CPU unplug.
      
         - a memory leak fix in writeback from Tahsin, fixing a case where
           device removal of a mounted device can leak a struct
           wb_writeback_work"
      
      * 'for-linus' of git://git.kernel.dk/linux-block:
        blk-mq-sched: don't run the queue async from blk_mq_try_issue_directly()
        writeback: fix memory leak in wb_queue_work()
        blk-mq: Fix tagset reinit in the presence of cpu hot-unplug
        blk: Ensure users for current->bio_list can see the full list.
      69eea5a4