1. 20 Feb, 2013 18 commits
  2. 18 Feb, 2013 3 commits
  3. 15 Feb, 2013 7 commits
  4. 14 Feb, 2013 5 commits
  5. 13 Feb, 2013 7 commits
    • Satoru Takeuchi's avatar
      efi: Clear EFI_RUNTIME_SERVICES rather than EFI_BOOT by "noefi" boot parameter · 1de63d60
      Satoru Takeuchi authored
      There was a serious problem in samsung-laptop that its platform driver is
      designed to run under BIOS and running under EFI can cause the machine to
      become bricked or can cause Machine Check Exceptions.
      
          Discussion about this problem:
          https://bugs.launchpad.net/ubuntu-cdimage/+bug/1040557
          https://bugzilla.kernel.org/show_bug.cgi?id=47121
      
          The patches to fix this problem:
          efi: Make 'efi_enabled' a function to query EFI facilities
          83e68189
      
          samsung-laptop: Disable on EFI hardware
          e0094244
      
      Unfortunately this problem comes back again if users specify "noefi" option.
      This parameter clears EFI_BOOT and that driver continues to run even if running
      under EFI. Refer to the document, this parameter should clear
      EFI_RUNTIME_SERVICES instead.
      
      Documentation/kernel-parameters.txt:
      ===============================================================================
      ...
      	noefi		[X86] Disable EFI runtime services support.
      ...
      ===============================================================================
      
      Documentation/x86/x86_64/uefi.txt:
      ===============================================================================
      ...
      - If some or all EFI runtime services don't work, you can try following
        kernel command line parameters to turn off some or all EFI runtime
        services.
      	noefi		turn off all EFI runtime services
      ...
      ===============================================================================
      Signed-off-by: default avatarSatoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
      Link: http://lkml.kernel.org/r/511C2C04.2070108@jp.fujitsu.com
      Cc: Matt Fleming <matt.fleming@intel.com>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
      1de63d60
    • Cyril Roelandt's avatar
      xen: remove redundant NULL check before unregister_and_remove_pcpu(). · 4f8c8527
      Cyril Roelandt authored
      unregister_and_remove_pcpu on a NULL pointer is a no-op, so the NULL check in
      sync_pcpu can be removed.
      Signed-off-by: default avatarCyril Roelandt <tipecaml@gmail.com>
      Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      4f8c8527
    • Jan Beulich's avatar
      x86/xen: don't assume %ds is usable in xen_iret for 32-bit PVOPS. · 13d2b4d1
      Jan Beulich authored
      This fixes CVE-2013-0228 / XSA-42
      
      Drew Jones while working on CVE-2013-0190 found that that unprivileged guest user
      in 32bit PV guest can use to crash the > guest with the panic like this:
      
      -------------
      general protection fault: 0000 [#1] SMP
      last sysfs file: /sys/devices/vbd-51712/block/xvda/dev
      Modules linked in: sunrpc ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4
      iptable_filter ip_tables ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6
      xt_state nf_conntrack ip6table_filter ip6_tables ipv6 xen_netfront ext4
      mbcache jbd2 xen_blkfront dm_mirror dm_region_hash dm_log dm_mod [last
      unloaded: scsi_wait_scan]
      
      Pid: 1250, comm: r Not tainted 2.6.32-356.el6.i686 #1
      EIP: 0061:[<c0407462>] EFLAGS: 00010086 CPU: 0
      EIP is at xen_iret+0x12/0x2b
      EAX: eb8d0000 EBX: 00000001 ECX: 08049860 EDX: 00000010
      ESI: 00000000 EDI: 003d0f00 EBP: b77f8388 ESP: eb8d1fe0
       DS: 0000 ES: 007b FS: 0000 GS: 00e0 SS: 0069
      Process r (pid: 1250, ti=eb8d0000 task=c2953550 task.ti=eb8d0000)
      Stack:
       00000000 0027f416 00000073 00000206 b77f8364 0000007b 00000000 00000000
      Call Trace:
      Code: c3 8b 44 24 18 81 4c 24 38 00 02 00 00 8d 64 24 30 e9 03 00 00 00
      8d 76 00 f7 44 24 08 00 00 02 80 75 33 50 b8 00 e0 ff ff 21 e0 <8b> 40
      10 8b 04 85 a0 f6 ab c0 8b 80 0c b0 b3 c0 f6 44 24 0d 02
      EIP: [<c0407462>] xen_iret+0x12/0x2b SS:ESP 0069:eb8d1fe0
      general protection fault: 0000 [#2]
      ---[ end trace ab0d29a492dcd330 ]---
      Kernel panic - not syncing: Fatal exception
      Pid: 1250, comm: r Tainted: G      D    ---------------
      2.6.32-356.el6.i686 #1
      Call Trace:
       [<c08476df>] ? panic+0x6e/0x122
       [<c084b63c>] ? oops_end+0xbc/0xd0
       [<c084b260>] ? do_general_protection+0x0/0x210
       [<c084a9b7>] ? error_code+0x73/
      -------------
      
      Petr says: "
       I've analysed the bug and I think that xen_iret() cannot cope with
       mangled DS, in this case zeroed out (null selector/descriptor) by either
       xen_failsafe_callback() or RESTORE_REGS because the corresponding LDT
       entry was invalidated by the reproducer. "
      
      Jan took a look at the preliminary patch and came up a fix that solves
      this problem:
      
      "This code gets called after all registers other than those handled by
      IRET got already restored, hence a null selector in %ds or a non-null
      one that got loaded from a code or read-only data descriptor would
      cause a kernel mode fault (with the potential of crashing the kernel
      as a whole, if panic_on_oops is set)."
      
      The way to fix this is to realize that the we can only relay on the
      registers that IRET restores. The two that are guaranteed are the
      %cs and %ss as they are always fixed GDT selectors. Also they are
      inaccessible from user mode - so they cannot be altered. This is
      the approach taken in this patch.
      
      Another alternative option suggested by Jan would be to relay on
      the subtle realization that using the %ebp or %esp relative references uses
      the %ss segment.  In which case we could switch from using %eax to %ebp and
      would not need the %ss over-rides. That would also require one extra
      instruction to compensate for the one place where the register is used
      as scaled index. However Andrew pointed out that is too subtle and if
      further work was to be done in this code-path it could escape folks attention
      and lead to accidents.
      Reviewed-by: default avatarPetr Matousek <pmatouse@redhat.com>
      Reported-by: default avatarPetr Matousek <pmatouse@redhat.com>
      Reviewed-by: default avatarAndrew Cooper <andrew.cooper3@citrix.com>
      Signed-off-by: default avatarJan Beulich <jbeulich@suse.com>
      Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      13d2b4d1
    • David S. Miller's avatar
      sparc64: Fix get_user_pages_fast() wrt. THP. · 89a77915
      David S. Miller authored
      Mostly mirrors the s390 logic, as unlike x86 we don't need the
      SetPageReferenced() bits.
      
      On sparc64 we also lack a user/privileged bit in the huge PMDs.
      
      In order to make this work for THP and non-THP builds, some header
      file adjustments were necessary.  Namely, provide the PMD_HUGE_* bit
      defines and the pmd_large() inline unconditionally rather than
      protected by TRANSPARENT_HUGEPAGE.
      Reported-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      89a77915
    • David S. Miller's avatar
      sparc64: Add missing HAVE_ARCH_TRANSPARENT_HUGEPAGE. · b9156ebb
      David S. Miller authored
      This got missed in the cleanups done for the S390 THP
      support.
      
      CC: Gerald Schaefer <gerald.schaefer@de.ibm.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      b9156ebb
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · 323a72d8
      Linus Torvalds authored
      Pull networking fixes from David Miller:
       "This is primarily to get those r8169 reverts sorted, but other fixes
        have accumulated meanwhile.
      
         1) Revert two r8169 changes to fix suspend/resume for some users,
            from Francois Romieu.
      
         2) PCI dma mapping errors in atl1c are not checked for and this cause
            hard crashes for some users, from Xiong Huang.
      
         3) In 3.8.x we merged the removal of the EXPERIMENTAL dependency for
            'dlm' but the same patch for 'sctp' got lost somewhere, resulting
            in the potential for build errors since there are cross
            dependencies.  From Kees Cook.
      
         4) SCTP's ipv6 socket route validation makes boolean tests
            incorrectly, fix from Daniel Borkmann.
      
         5) mac80211 does sizeof(ptr) instead of (sizeof(ptr) * nelem), from
            Cong Ding.
      
         6) arp_rcv() can crash on shared non-linear packets, from Eric
            Dumazet.
      
         7) Avoid crashes in macvtap by setting ->gso_type consistently in
            ixgbe, qlcnic, and bnx2x drivers.  From Michael S Tsirkin and
            Alexander Duyck.
      
         8) Trinity fuzzer spots infinite loop in __skb_recv_datagram(), fix
            from Eric Dumazet.
      
         9) STP protocol frames should use high packet priority, otherwise an
            overloaded bridge can get stuck.  From Stephen Hemminger.
      
        10) The HTB packet scheduler was converted some time ago to store
            internal timestamps in nanoseconds, but we don't convert back into
            psched ticks for the user during dumps.  Fix from Jiri Pirko.
      
        11) mwl8k channel table doesn't set the .band field properly,
            resulting in NULL pointer derefs.  Fix from Jonas Gorski.
      
        12) mac80211 doesn't accumulate channels properly during a scan so we
            can downgrade heavily to a much less desirable connection speed.
            Fix from Johannes Berg.
      
        13) PHY probe failure in stmmac can result in resource leaks and
            double MDIO registery later, from Giuseppe CAVALLARO.
      
        14) Correct ipv6 checksumming in ip6t_NPT netfilter module, also fix
            address prefix mangling, from YOSHIFUJI Hideaki."
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (27 commits)
        net, sctp: remove CONFIG_EXPERIMENTAL
        net: sctp: sctp_v6_get_dst: fix boolean test in dst cache
        batman-adv: Fix NULL pointer dereference in DAT hash collision avoidance
        net/macb: fix race with RX interrupt while doing NAPI
        atl1c: add error checking for pci_map_single functions
        htb: fix values in opt dump
        ixgbe: Only set gso_type to SKB_GSO_TCPV4 as RSC does not support IPv6
        net: fix infinite loop in __skb_recv_datagram()
        net: qmi_wwan: add Yota / Megafon M100-1 4g modem
        mwl8k: fix band for supported channels
        bridge: set priority of STP packets
        mac80211: fix channel selection bug
        arp: fix possible crash in arp_rcv()
        bnx2x: set gso_type
        qlcnic: set gso_type
        ixgbe: fix gso type
        stmmac: mdio register has to fail if the phy is not found
        stmmac: fix macro used for debugging the xmit
        Revert "r8169: enable internal ASPM and clock request settings".
        Revert "r8169: enable ALDPS for power saving".
        ...
      323a72d8
    • Linus Torvalds's avatar
      Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 42976ad0
      Linus Torvalds authored
      Pull x86 fixes from Peter Anvin:
       "One (hopefully) last batch of x86 fixes.  You asked for the patch by
        patch justifications, so here they are:
      
            x86, MCE: Retract most UAPI exports
      
         This one unexports from userspace a bunch of definitions which should
         never have been exported.  We really don't want to create an
         accidental legacy here.
      
            x86, doc: Add a bootloader ID for OVMF
      
         This is a documentation-only patch, just recording the official
         assignment of a boot loader ID.
      
            x86: Do not leak kernel page mapping locations
      
         Security: avoid making it needlessly easy for user space to probe the
         kernel memory layout.
      
            x86/mm: Check if PUD is large when validating a kernel address
      
         Prevent failures using /proc/kcore when using 1G pages.
      
            x86/apic: Work around boot failure on HP ProLiant DL980 G7 Server systems
      
         Works around a BIOS problem causing boot failures on affected hardware."
      
      * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        x86/mm: Check if PUD is large when validating a kernel address
        x86/apic: Work around boot failure on HP ProLiant DL980 G7 Server systems
        x86, doc: Add a bootloader ID for OVMF
        x86: Do not leak kernel page mapping locations
        x86, MCE: Retract most UAPI exports
      42976ad0