1. 07 Mar, 2017 24 commits
  2. 06 Mar, 2017 7 commits
    • Eric W. Biederman's avatar
      ucount: Remove the atomicity from ucount->count · 040757f7
      Eric W. Biederman authored
      Always increment/decrement ucount->count under the ucounts_lock.  The
      increments are there already and moving the decrements there means the
      locking logic of the code is simpler.  This simplification in the
      locking logic fixes a race between put_ucounts and get_ucounts that
      could result in a use-after-free because the count could go zero then
      be found by get_ucounts and then be freed by put_ucounts.
      
      A bug presumably this one was found by a combination of syzkaller and
      KASAN.  JongWhan Kim reported the syzkaller failure and Dmitry Vyukov
      spotted the race in the code.
      
      Cc: stable@vger.kernel.org
      Fixes: f6b2db1a ("userns: Make the count of user namespaces per user")
      Reported-by: default avatarJongHwan Kim <zzoru007@gmail.com>
      Reported-by: default avatarDmitry Vyukov <dvyukov@google.com>
      Reviewed-by: default avatarAndrei Vagin <avagin@gmail.com>
      Signed-off-by: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
      040757f7
    • Michael Ellerman's avatar
      powerpc: Sort the selects under CONFIG_PPC · a7d2475a
      Michael Ellerman authored
      We have a big list of selects under CONFIG_PPC, and currently they're
      completely unsorted. This means people tend to add new selects at the
      bottom of the list, and so two commits which both add a new select will
      often conflict.
      
      Instead sort it alphabetically. This is nicer in and of itself, but also
      means two commits that add a new select will have a greater chance of
      not conflicting.
      
      Add a note at the top and bottom asking people to keep it sorted.
      
      And while we're here pad out the 'if' expressions to make them stand
      out.
      Suggested-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      a7d2475a
    • Michael Ellerman's avatar
      powerpc/64: Fix L1D cache shape vector reporting L1I values · 9c7a0086
      Michael Ellerman authored
      It seems we didn't pay quite enough attention when testing the new cache
      shape vectors, which means we didn't notice the bug where the vector for
      the L1D was using the L1I values. Fix it, resulting in eg:
      
        L1I  cache size:     0x8000      32768B         32K
        L1I  line size:        0x80       8-way associative
        L1D  cache size:    0x10000      65536B         64K
        L1D  line size:        0x80       8-way associative
      
      Fixes: 98a5f361 ("powerpc: Add new cache geometry aux vectors")
      Cut-and-paste-bug-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      Badly-reviewed-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      9c7a0086
    • Anton Blanchard's avatar
      powerpc/64: Avoid panic during boot due to divide by zero in init_cache_info() · 6ba422c7
      Anton Blanchard authored
      I see a panic in early boot when building with a recent gcc toolchain.
      The issue is a divide by zero, which is undefined. Older toolchains
      let us get away with it:
      
      int foo(int a) { return a / 0; }
      
      foo:
      	li 9,0
      	divw 3,3,9
      	extsw 3,3
      	blr
      
      But newer ones catch it:
      
      foo:
      	trap
      
      Add a check to avoid the divide by zero.
      
      Fixes: e2827fe5 ("powerpc/64: Clean up ppc64_caches using a struct per cache")
      Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
      Acked-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      6ba422c7
    • Suraj Jitindar Singh's avatar
      powerpc: Update to new option-vector-5 format for CAS · 014d02cb
      Suraj Jitindar Singh authored
      On POWER9 the ibm,client-architecture-support (CAS) negotiation process
      has been updated to change how the host to guest negotiation is done for
      the new hash/radix mmu as well as the nest mmu, process tables and guest
      translation shootdown (GTSE).
      
      This is documented in the unreleased PAPR ACR "CAS option vector
      additions for P9".
      
      The host tells the guest which options it supports in
      ibm,arch-vec-5-platform-support. The guest then chooses a subset of these
      to request in the CAS call and these are agreed to in the
      ibm,architecture-vec-5 property of the chosen node.
      
      Thus we read ibm,arch-vec-5-platform-support and make our selection before
      calling CAS. We then parse the ibm,architecture-vec-5 property of the
      chosen node to check whether we should run as hash or radix.
      
      ibm,arch-vec-5-platform-support format:
      
      index value pairs: <index, val> ... <index, val>
      
      index: Option vector 5 byte number
      val:   Some representation of supported values
      Signed-off-by: default avatarSuraj Jitindar Singh <sjitindarsingh@gmail.com>
      Acked-by: default avatarPaul Mackerras <paulus@ozlabs.org>
      [mpe: Don't print about unknown options, be consistent with OV5_FEAT]
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      014d02cb
    • Suraj Jitindar Singh's avatar
      powerpc: Parse the command line before calling CAS · 12cc9fd6
      Suraj Jitindar Singh authored
      On POWER9 the hypervisor requires the guest to decide whether it would
      like to use a hash or radix mmu model at the time it calls
      ibm,client-architecture-support (CAS) based on what the hypervisor has
      said it's allowed to do. It is possible to disable radix by passing
      "disable_radix" on the command line. The next patch will add support for
      the new CAS format, thus we need to parse the command line before calling
      CAS so we can correctly select which mmu we would like to use.
      Signed-off-by: default avatarSuraj Jitindar Singh <sjitindarsingh@gmail.com>
      Reviewed-by: default avatarPaul Mackerras <paulus@ozlabs.org>
      Acked-by: default avatarBalbir Singh <bsingharora@gmail.com>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      12cc9fd6
    • Balbir Singh's avatar
      powerpc/xics: Work around limitations of OPAL XICS priority handling · a69e2fb7
      Balbir Singh authored
      The CPPR (Current Processor Priority Register) of a XICS interrupt
      presentation controller contains a value N, such that only interrupts
      with a priority "more favoured" than N will be received by the CPU,
      where "more favoured" means "less than". So if the CPPR has the value 5
      then only interrupts with a priority of 0-4 inclusive will be received.
      
      In theory the CPPR can support a value of 0 to 255 inclusive.
      In practice Linux only uses values of 0, 4, 5 and 0xff. Setting the CPPR
      to 0 rejects all interrupts, setting it to 0xff allows all interrupts.
      The values 4 and 5 are used to differentiate IPIs from external
      interrupts. Setting the CPPR to 5 allows IPIs to be received but not
      external interrupts.
      
      The CPPR emulation in the OPAL XICS implementation only directly
      supports priorities 0 and 0xff. All other priorities are considered
      equivalent, and mapped to a single priority value internally. This means
      when using icp-opal we can not allow IPIs but not externals.
      
      This breaks Linux's use of priority values when a CPU is hot unplugged.
      After migrating IRQs away from the CPU that is being offlined, we set
      the priority to 5, meaning we still want the offline CPU to receive
      IPIs. But the effect of the OPAL XICS emulation's use of a single
      priority value is that all interrupts are rejected by the CPU. With the
      CPU offline, and not receiving IPIs, we may not be able to wake it up to
      bring it back online.
      
      The first part of the fix is in icp_opal_set_cpu_priority(). CPPR values
      of 0 to 4 inclusive will correctly cause all interrupts to be rejected,
      so we pass those CPPR values through to OPAL. However if we are called
      with a CPPR of 5 or greater, the caller is expecting to be able to allow
      IPIs but not external interrupts. We know this doesn't work, so instead
      of rejecting all interrupts we choose the opposite which is to allow all
      interrupts. This is still not correct behaviour, but we know for the
      only existing caller (xics_migrate_irqs_away()), that it is the better
      option.
      
      The other part of the fix is in xics_migrate_irqs_away(). Instead of
      setting priority (CPPR) to 0, and then back to 5 before migrating IRQs,
      we migrate the IRQs before setting the priority back to 5. This should
      have no effect on an ICP backend with a working set_priority(), and on
      icp-opal it means we will keep all interrupts blocked until after we've
      finished doing the IRQ migration. Additionally we wait for 5ms after
      doing the migration to make sure there are no IRQs in flight.
      
      Fixes: d7436188 ("powerpc/xics: Add ICP OPAL backend")
      Cc: stable@vger.kernel.org # v4.8+
      Suggested-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      Reported-by: default avatarVaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
      Tested-by: default avatarVaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
      Signed-off-by: default avatarBalbir Singh <bsingharora@gmail.com>
      [mpe: Rewrote comments and change log, change delay to 5ms]
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      a69e2fb7
  3. 05 Mar, 2017 2 commits
    • Linus Torvalds's avatar
      Linux 4.11-rc1 · c1ae3cfa
      Linus Torvalds authored
      c1ae3cfa
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · 8d70eeb8
      Linus Torvalds authored
      Pull networking fixes from David Miller:
      
       1) Fix double-free in batman-adv, from Sven Eckelmann.
      
       2) Fix packet stats for fast-RX path, from Joannes Berg.
      
       3) Netfilter's ip_route_me_harder() doesn't handle request sockets
          properly, fix from Florian Westphal.
      
       4) Fix sendmsg deadlock in rxrpc, from David Howells.
      
       5) Add missing RCU locking to transport hashtable scan, from Xin Long.
      
       6) Fix potential packet loss in mlxsw driver, from Ido Schimmel.
      
       7) Fix race in NAPI handling between poll handlers and busy polling,
          from Eric Dumazet.
      
       8) TX path in vxlan and geneve need proper RCU locking, from Jakub
          Kicinski.
      
       9) SYN processing in DCCP and TCP need to disable BH, from Eric
          Dumazet.
      
      10) Properly handle net_enable_timestamp() being invoked from IRQ
          context, also from Eric Dumazet.
      
      11) Fix crash on device-tree systems in xgene driver, from Alban Bedel.
      
      12) Do not call sk_free() on a locked socket, from Arnaldo Carvalho de
          Melo.
      
      13) Fix use-after-free in netvsc driver, from Dexuan Cui.
      
      14) Fix max MTU setting in bonding driver, from WANG Cong.
      
      15) xen-netback hash table can be allocated from softirq context, so use
          GFP_ATOMIC. From Anoob Soman.
      
      16) Fix MAC address change bug in bgmac driver, from Hari Vyas.
      
      17) strparser needs to destroy strp_wq on module exit, from WANG Cong.
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (69 commits)
        strparser: destroy workqueue on module exit
        sfc: fix IPID endianness in TSOv2
        sfc: avoid max() in array size
        rds: remove unnecessary returned value check
        rxrpc: Fix potential NULL-pointer exception
        nfp: correct DMA direction in XDP DMA sync
        nfp: don't tell FW about the reserved buffer space
        net: ethernet: bgmac: mac address change bug
        net: ethernet: bgmac: init sequence bug
        xen-netback: don't vfree() queues under spinlock
        xen-netback: keep a local pointer for vif in backend_disconnect()
        netfilter: nf_tables: don't call nfnetlink_set_err() if nfnetlink_send() fails
        netfilter: nft_set_rbtree: incorrect assumption on lower interval lookups
        netfilter: nf_conntrack_sip: fix wrong memory initialisation
        can: flexcan: fix typo in comment
        can: usb_8dev: Fix memory leak of priv->cmd_msg_buffer
        can: gs_usb: fix coding style
        can: gs_usb: Don't use stack memory for USB transfers
        ixgbe: Limit use of 2K buffers on architectures with 256B or larger cache lines
        ixgbe: update the rss key on h/w, when ethtool ask for it
        ...
      8d70eeb8
  4. 04 Mar, 2017 7 commits
    • Linus Torvalds's avatar
      Merge tag 'kvm-4.11-2' of git://git.kernel.org/pub/scm/virt/kvm/kvm · 2d62e076
      Linus Torvalds authored
      Pull more KVM updates from Radim Krčmář:
       "Second batch of KVM changes for the 4.11 merge window:
      
        PPC:
         - correct assumption about ASDR on POWER9
         - fix MMIO emulation on POWER9
      
        x86:
         - add a simple test for ioperm
         - cleanup TSS (going through KVM tree as the whole undertaking was
           caused by VMX's use of TSS)
         - fix nVMX interrupt delivery
         - fix some performance counters in the guest
      
        ... and two cleanup patches"
      
      * tag 'kvm-4.11-2' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
        KVM: nVMX: Fix pending events injection
        x86/kvm/vmx: remove unused variable in segment_base()
        selftests/x86: Add a basic selftest for ioperm
        x86/asm: Tidy up TSS limit code
        kvm: convert kvm.users_count from atomic_t to refcount_t
        KVM: x86: never specify a sample period for virtualized in_tx_cp counters
        KVM: PPC: Book3S HV: Don't use ASDR for real-mode HPT faults on POWER9
        KVM: PPC: Book3S HV: Fix software walk of guest process page tables
      2d62e076
    • Linus Torvalds's avatar
      Merge tag 'docs-4.11-fixes' of git://git.lwn.net/linux · be834aaf
      Linus Torvalds authored
      Pull documentation fixes from Jonathan Corbet:
       "A few fixes for the docs tree, including one for a 4.11 build
        regression"
      
      * tag 'docs-4.11-fixes' of git://git.lwn.net/linux:
        Documentation/sphinx: fix primary_domain configuration
        docs: Fix htmldocs build failure
        doc/ko_KR/memory-barriers: Update control-dependencies section
        pcieaer doc: update the link
        Documentation: Update path to sysrq.txt
      be834aaf
    • Linus Torvalds's avatar
      Merge tag 'staging-4.11-rc1-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging · 91aff98b
      Linus Torvalds authored
      Pull staging/IIO driver fixes from Greg KH:
       "Here are a few small staging and IIO driver fixes for issues that
        showed up after the big set if changes you merged last week.
      
        Nothing major, just small bugs resolved in some IIO drivers, a lustre
        allocation fix, and some RaspberryPi driver fixes for reported
        problems, as well as a MAINTAINERS entry update.
      
        All of these have been in linux-next for a week with no reported
        issues"
      
      * tag 'staging-4.11-rc1-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
        staging: fsl-mc: fix warning in DT ranges parser
        MAINTAINERS: Remove Noralf Trønnes as fbtft maintainer
        staging: vchiq_2835_arm: Make cache-line-size a required DT property
        staging: bcm2835/mmal-vchiq: unlock on error in buffer_from_host()
        staging/lustre/lnet: Fix allocation size for sv_cpt_data
        iio: adc: xilinx: Fix error handling
        iio: 104-quad-8: Fix off-by-one error when addressing flag register
        iio: adc: handle unknow of_device_id data
      91aff98b
    • Linus Torvalds's avatar
      Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 · 33a8b3e9
      Linus Torvalds authored
      Pull crypto fixes from Herbert Xu:
      
       - vmalloc stack regression in CCM
      
       - Build problem in CRC32 on ARM
      
       - Memory leak in cavium
      
       - Missing Kconfig dependencies in atmel and mediatek
      
       - XTS Regression on some platforms (s390 and ppc)
      
       - Memory overrun in CCM test vector
      
      * 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
        crypto: vmx - Use skcipher for xts fallback
        crypto: vmx - Use skcipher for cbc fallback
        crypto: testmgr - Pad aes_ccm_enc_tv_template vector
        crypto: arm/crc32 - add build time test for CRC instruction support
        crypto: arm/crc32 - fix build error with outdated binutils
        crypto: ccm - move cbcmac input off the stack
        crypto: xts - Propagate NEED_FALLBACK bit
        crypto: api - Add crypto_requires_off helper
        crypto: atmel - CRYPTO_DEV_MEDIATEK should depend on HAS_DMA
        crypto: atmel - CRYPTO_DEV_ATMEL_TDES and CRYPTO_DEV_ATMEL_SHA should depend on HAS_DMA
        crypto: cavium - fix leak on curr if curr->head fails to be allocated
        crypto: cavium - Fix couple of static checker errors
      33a8b3e9
    • Shile Zhang's avatar
      powerpc/64: Fix checksum folding in csum_add() · 6ad966d7
      Shile Zhang authored
      Paul's patch to fix checksum folding, commit b492f7e4 ("powerpc/64:
      Fix checksum folding in csum_tcpudp_nofold and ip_fast_csum_nofold")
      missed a case in csum_add(). Fix it.
      Signed-off-by: default avatarShile Zhang <shile.zhang@nokia.com>
      Acked-by: default avatarPaul Mackerras <paulus@ozlabs.org>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      6ad966d7
    • Alexey Kardashevskiy's avatar
      powerpc/powernv: Fix opal tracepoints with JUMP_LABEL=n · 2a9c4f40
      Alexey Kardashevskiy authored
      The recent commit to allow calling OPAL calls in real mode, commit
      ab9bad0e ("powerpc/powernv: Remove separate entry for OPAL real mode
      calls"), introduced a bug when CONFIG_JUMP_LABEL=n.
      
      The commit moved the "mfmsr r12" prior to the call to OPAL_BRANCH, but
      we missed that OPAL_BRANCH clobbers r12 when jump labels are disabled.
      This leads to us using the tracepoint refcount as the MSR value,
      typically zero, and saving that into PACASAVEDMSR. When we return from
      OPAL we use that value as the MSR value for rfid, meaning we switch to
      32-bit BE real mode - hilarity ensues.
      
      Fix it by using r11 in OPAL_BRANCH, which is not live at the time the
      macro is used in OPAL_CALL.
      
      Fixes: ab9bad0e ("powerpc/powernv: Remove separate entry for OPAL real mode calls")
      Suggested-by: default avatarPaul Mackerras <paulus@samba.org>
      Signed-off-by: default avatarAlexey Kardashevskiy <aik@ozlabs.ru>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      2a9c4f40
    • Linus Torvalds's avatar
      Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs · 0710f3ff
      Linus Torvalds authored
      Pull misc final vfs updates from Al Viro:
       "A few unrelated patches that got beating in -next.
      
        Everything else will have to go into the next window ;-/"
      
      * 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
        hfs: fix hfs_readdir()
        selftest for default_file_splice_read() infoleak
        9p: constify ->d_name handling
      0710f3ff