1. 03 Nov, 2017 21 commits
    • Linus Torvalds's avatar
      Merge tag 'powerpc-4.14-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux · 866ba84e
      Linus Torvalds authored
      Pull powerpc fixes from Michael Ellerman:
       "Some more powerpc fixes for 4.14.
      
        This is bigger than I like to send at rc7, but that's at least partly
        because I didn't send any fixes last week. If it wasn't for the IMC
        driver, which is new and getting heavy testing, the diffstat would
        look a bit better. I've also added ftrace on big endian to my test
        suite, so we shouldn't break that again in future.
      
         - A fix to the handling of misaligned paste instructions (P9 only),
           where a change to a #define has caused the check for the
           instruction to always fail.
      
         - The preempt handling was unbalanced in the radix THP flush (P9
           only). Though we don't generally use preempt we want to keep it
           working as much as possible.
      
         - Two fixes for IMC (P9 only), one when booting with restricted
           number of CPUs and one in the error handling when initialisation
           fails due to firmware etc.
      
         - A revert to fix function_graph on big endian machines, and then a
           rework of the reverted patch to fix kprobes blacklist handling on
           big endian machines.
      
        Thanks to: Anju T Sudhakar, Guilherme G. Piccoli, Madhavan Srinivasan,
        Naveen N. Rao, Nicholas Piggin, Paul Mackerras"
      
      * tag 'powerpc-4.14-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
        powerpc/perf: Fix core-imc hotplug callback failure during imc initialization
        powerpc/kprobes: Dereference function pointers only if the address does not belong to kernel text
        Revert "powerpc64/elfv1: Only dereference function descriptor for non-text symbols"
        powerpc/64s/radix: Fix preempt imbalance in TLB flush
        powerpc: Fix check for copy/paste instructions in alignment handler
        powerpc/perf: Fix IMC allocation routine
      866ba84e
    • Linus Torvalds's avatar
      Merge tag 'mmc-v4.14-rc4-3' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc · 3f46540e
      Linus Torvalds authored
      Pull MMC fixes from Ulf Hansson:
       "Fix dw_mmc request timeout issues"
      
      * tag 'mmc-v4.14-rc4-3' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc:
        mmc: dw_mmc: Fix the DTO timeout calculation
        mmc: dw_mmc: Add locking to the CTO timer
        mmc: dw_mmc: Fix the CTO timeout calculation
        mmc: dw_mmc: cancel the CTO timer after a voltage switch
      3f46540e
    • Linus Torvalds's avatar
      Merge tag 'drm-fixes-for-v4.14-rc8' of git://people.freedesktop.org/~airlied/linux · e65a139d
      Linus Torvalds authored
      Pull drm fixes from Dave Airlie:
      
       - one nouveau regression fix
      
       - some amdgpu fixes for stable to fix hangs on some harvested Polaris
         GPUs
      
       - a set of KASAN and regression fixes for i915, their CI system seems
         to be working pretty well now.
      
      * tag 'drm-fixes-for-v4.14-rc8' of git://people.freedesktop.org/~airlied/linux:
        drm/amdgpu: allow harvesting check for Polaris VCE
        drm/amdgpu: return -ENOENT from uvd 6.0 early init for harvesting
        drm/i915: Check incoming alignment for unfenced buffers (on i915gm)
        drm/nouveau/kms/nv50: use the correct state for base channel notifier setup
        drm/i915: Hold rcu_read_lock when iterating over the radixtree (vma idr)
        drm/i915: Hold rcu_read_lock when iterating over the radixtree (objects)
        drm/i915/edp: read edp display control registers unconditionally
        drm/i915: Do not rely on wm preservation for ILK watermarks
        drm/i915: Cancel the modeset retry work during modeset cleanup
      e65a139d
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · 7ba3ebff
      Linus Torvalds authored
      Pull networking fixes from David Miller:
       "Hopefully this is the last batch of networking fixes for 4.14
      
        Fingers crossed...
      
         1) Fix stmmac to use the proper sized OF property read, from Bhadram
            Varka.
      
         2) Fix use after free in net scheduler tc action code, from Cong
            Wang.
      
         3) Fix SKB control block mangling in tcp_make_synack().
      
         4) Use proper locking in fib_dump_info(), from Florian Westphal.
      
         5) Fix IPG encodings in systemport driver, from Florian Fainelli.
      
         6) Fix division by zero in NV TCP congestion control module, from
            Konstantin Khlebnikov.
      
         7) Fix use after free in nf_reject_ipv4, from Tejaswi Tanikella"
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net:
        net: systemport: Correct IPG length settings
        tcp: do not mangle skb->cb[] in tcp_make_synack()
        fib: fib_dump_info can no longer use __in_dev_get_rtnl
        stmmac: use of_property_read_u32 instead of read_u8
        net_sched: hold netns refcnt for each action
        net_sched: acquire RTNL in tc_action_net_exit()
        net: vrf: correct FRA_L3MDEV encode type
        tcp_nv: fix division by zero in tcpnv_acked()
        netfilter: nf_reject_ipv4: Fix use-after-free in send_reset
        netfilter: nft_set_hash: disable fast_ops for 2-len keys
      7ba3ebff
    • Linus Torvalds's avatar
      Merge branch 'akpm' (patches from Andrew) · f0395d5b
      Linus Torvalds authored
      Merge misc fixes from Andrew Morton:
       "7 fixes"
      
      * emailed patches from Andrew Morton <akpm@linux-foundation.org>:
        mm, swap: fix race between swap count continuation operations
        mm/huge_memory.c: deposit page table when copying a PMD migration entry
        initramfs: fix initramfs rebuilds w/ compression after disabling
        fs/hugetlbfs/inode.c: fix hwpoison reserve accounting
        ocfs2: fstrim: Fix start offset of first cluster group during fstrim
        mm, /proc/pid/pagemap: fix soft dirty marking for PMD migration entry
        userfaultfd: hugetlbfs: prevent UFFDIO_COPY to fill beyond the end of i_size
      f0395d5b
    • Paul Burton's avatar
      Update MIPS email addresses · fb615d61
      Paul Burton authored
      MIPS will soon not be a part of Imagination Technologies, and as such
      many @imgtec.com email addresses will no longer be valid. This patch
      updates the addresses for those who:
      
       - Have 10 or more patches in mainline authored using an @imgtec.com
         email address, or any patches dated within the past year.
      
       - Are still with Imagination but leaving as part of the MIPS business
         unit, as determined from an internal email address list.
      
       - Haven't already updated their email address (ie. JamesH) or expressed
         a desire to be excluded (ie. Maciej).
      
       - Acked v2 or earlier of this patch, which leaves Deng-Cheng, Matt &
         myself.
      
      New addresses are of the form firstname.lastname@mips.com, and all
      verified against an internal email address list.  An entry is added to
      .mailmap for each person such that get_maintainer.pl will report the new
      addresses rather than @imgtec.com addresses which will soon be dead.
      
      Instances of the affected addresses throughout the tree are then
      mechanically replaced with the new @mips.com address.
      Signed-off-by: default avatarPaul Burton <paul.burton@mips.com>
      Cc: Deng-Cheng Zhu <dengcheng.zhu@imgtec.com>
      Cc: Deng-Cheng Zhu <dengcheng.zhu@mips.com>
      Acked-by: default avatarDengcheng Zhu <dengcheng.zhu@mips.com>
      Cc: Matt Redfearn <matt.redfearn@imgtec.com>
      Cc: Matt Redfearn <matt.redfearn@mips.com>
      Acked-by: default avatarMatt Redfearn <matt.redfearn@mips.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: linux-kernel@vger.kernel.org
      Cc: linux-mips@linux-mips.org
      Cc: trivial@kernel.org
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      fb615d61
    • Rafael J. Wysocki's avatar
      x86: CPU: Fix up "cpu MHz" in /proc/cpuinfo · 941f5f0f
      Rafael J. Wysocki authored
      Commit 890da9cf (Revert "x86: do not use cpufreq_quick_get() for
      /proc/cpuinfo "cpu MHz"") is not sufficient to restore the previous
      behavior of "cpu MHz" in /proc/cpuinfo on x86 due to some changes
      made after the commit it has reverted.
      
      To address this, make the code in question use arch_freq_get_on_cpu()
      which also is used by cpufreq for reporting the current frequency of
      CPUs and since that function doesn't really depend on cpufreq in any
      way, drop the CONFIG_CPU_FREQ dependency for the object file
      containing it.
      
      Also refactor arch_freq_get_on_cpu() somewhat to avoid IPIs and
      return cached values right away if it is called very often over a
      short time (to prevent user space from triggering IPI storms through
      it).
      
      Fixes: 890da9cf (Revert "x86: do not use cpufreq_quick_get() for /proc/cpuinfo "cpu MHz"")
      Cc: stable@kernel.org   # 4.13 - together with 890da9cfSigned-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      941f5f0f
    • Huang Ying's avatar
      mm, swap: fix race between swap count continuation operations · 2628bd6f
      Huang Ying authored
      One page may store a set of entries of the sis->swap_map
      (swap_info_struct->swap_map) in multiple swap clusters.
      
      If some of the entries has sis->swap_map[offset] > SWAP_MAP_MAX,
      multiple pages will be used to store the set of entries of the
      sis->swap_map.  And the pages are linked with page->lru.  This is called
      swap count continuation.  To access the pages which store the set of
      entries of the sis->swap_map simultaneously, previously, sis->lock is
      used.  But to improve the scalability of __swap_duplicate(), swap
      cluster lock may be used in swap_count_continued() now.  This may race
      with add_swap_count_continuation() which operates on a nearby swap
      cluster, in which the sis->swap_map entries are stored in the same page.
      
      The race can cause wrong swap count in practice, thus cause unfreeable
      swap entries or software lockup, etc.
      
      To fix the race, a new spin lock called cont_lock is added to struct
      swap_info_struct to protect the swap count continuation page list.  This
      is a lock at the swap device level, so the scalability isn't very well.
      But it is still much better than the original sis->lock, because it is
      only acquired/released when swap count continuation is used.  Which is
      considered rare in practice.  If it turns out that the scalability
      becomes an issue for some workloads, we can split the lock into some
      more fine grained locks.
      
      Link: http://lkml.kernel.org/r/20171017081320.28133-1-ying.huang@intel.com
      Fixes: 235b6217 ("mm/swap: add cluster lock")
      Signed-off-by: default avatar"Huang, Ying" <ying.huang@intel.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Shaohua Li <shli@kernel.org>
      Cc: Tim Chen <tim.c.chen@intel.com>
      Cc: Michal Hocko <mhocko@suse.com>
      Cc: Aaron Lu <aaron.lu@intel.com>
      Cc: Dave Hansen <dave.hansen@intel.com>
      Cc: Andi Kleen <ak@linux.intel.com>
      Cc: Minchan Kim <minchan@kernel.org>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: <stable@vger.kernel.org>	[4.11+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      2628bd6f
    • Zi Yan's avatar
      mm/huge_memory.c: deposit page table when copying a PMD migration entry · dd8a67f9
      Zi Yan authored
      We need to deposit pre-allocated PTE page table when a PMD migration
      entry is copied in copy_huge_pmd().  Otherwise, we will leak the
      pre-allocated page and cause a NULL pointer dereference later in
      zap_huge_pmd().
      
      The missing counters during PMD migration entry copy process are added
      as well.
      
      The bug report is here: https://lkml.org/lkml/2017/10/29/214
      
      Link: http://lkml.kernel.org/r/20171030144636.4836-1-zi.yan@sent.com
      Fixes: 84c3fc4e ("mm: thp: check pmd migration entry in common path")
      Signed-off-by: default avatarZi Yan <zi.yan@cs.rutgers.edu>
      Reported-by: default avatarFengguang Wu <fengguang.wu@intel.com>
      Acked-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      dd8a67f9
    • Florian Fainelli's avatar
      initramfs: fix initramfs rebuilds w/ compression after disabling · e08b1877
      Florian Fainelli authored
      This is a follow-up to commit 57ddfdaa ("initramfs: fix disabling of
      initramfs (and its compression)").  This particular commit fixed the use
      case where we build the kernel with an initramfs with no compression,
      and then we build the kernel with no initramfs.
      
      Now this still left us with the same case as described here:
      
        http://lkml.kernel.org/r/20170521033337.6197-1-f.fainelli@gmail.com
      
      not working with initramfs compression.  This can be seen by the
      following steps/timestamps:
      
        https://www.spinics.net/lists/kernel/msg2598153.html
      
      .initramfs_data.cpio.gz.cmd is correct:
      
        cmd_usr/initramfs_data.cpio.gz := /bin/bash
        ./scripts/gen_initramfs_list.sh -o usr/initramfs_data.cpio.gz  -u 1000 -g 1000  /home/fainelli/work/uclinux-rootfs/romfs /home/fainelli/work/uclinux-rootfs/misc/initramfs.dev
      
      and was generated the first time we did generate the gzip initramfs, so
      the command has not changed, nor its arguments, so we just don't call
      it, no initramfs cpio is re-generated as a consequence.
      
      The fix for this problem is just to properly keep track of the
      .initramfs_cpio_data.d file by suffixing it with the compression
      extension.  This takes care of properly tracking dependencies such that
      the initramfs get (re)generated any time files are added/deleted etc.
      
      Link: http://lkml.kernel.org/r/20170930033936.6722-1-f.fainelli@gmail.com
      Fixes: db2aa7fd ("initramfs: allow again choice of the embedded initramfs compression algorithm")
      Fixes: 9e3596b0 ("kbuild: initramfs cleanup, set target from Kconfig")
      Signed-off-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
      Cc: "Francisco Blas Izquierdo Riera (klondike)" <klondike@xiscosoft.net>
      Cc: Nicholas Piggin <npiggin@gmail.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e08b1877
    • Mike Kravetz's avatar
      fs/hugetlbfs/inode.c: fix hwpoison reserve accounting · ab615a5b
      Mike Kravetz authored
      Calling madvise(MADV_HWPOISON) on a hugetlbfs page will result in bad
      (negative) reserved huge page counts.  This may not happen immediately,
      but may happen later when the underlying file is removed or filesystem
      unmounted.  For example:
      
        AnonHugePages:         0 kB
        ShmemHugePages:        0 kB
        HugePages_Total:       1
        HugePages_Free:        0
        HugePages_Rsvd:    18446744073709551615
        HugePages_Surp:        0
        Hugepagesize:       2048 kB
      
      In routine hugetlbfs_error_remove_page(), hugetlb_fix_reserve_counts is
      called after remove_huge_page.  hugetlb_fix_reserve_counts is designed
      to only be called/used only if a failure is returned from
      hugetlb_unreserve_pages.  Therefore, call hugetlb_unreserve_pages as
      required and only call hugetlb_fix_reserve_counts in the unlikely event
      that hugetlb_unreserve_pages returns an error.
      
      Link: http://lkml.kernel.org/r/20171019230007.17043-2-mike.kravetz@oracle.com
      Fixes: 78bb9203 ("mm: hwpoison: dissolve in-use hugepage in unrecoverable memory error")
      Signed-off-by: default avatarMike Kravetz <mike.kravetz@oracle.com>
      Acked-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
      Cc: Michal Hocko <mhocko@kernel.org>
      Cc: Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>
      Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      ab615a5b
    • Ashish Samant's avatar
      ocfs2: fstrim: Fix start offset of first cluster group during fstrim · 105ddc93
      Ashish Samant authored
      The first cluster group descriptor is not stored at the start of the
      group but at an offset from the start.  We need to take this into
      account while doing fstrim on the first cluster group.  Otherwise we
      will wrongly start fstrim a few blocks after the desired start block and
      the range can cross over into the next cluster group and zero out the
      group descriptor there.  This can cause filesytem corruption that cannot
      be fixed by fsck.
      
      Link: http://lkml.kernel.org/r/1507835579-7308-1-git-send-email-ashish.samant@oracle.comSigned-off-by: default avatarAshish Samant <ashish.samant@oracle.com>
      Reviewed-by: default avatarJunxiao Bi <junxiao.bi@oracle.com>
      Reviewed-by: default avatarJoseph Qi <jiangqi903@gmail.com>
      Cc: Mark Fasheh <mfasheh@versity.com>
      Cc: Joel Becker <jlbec@evilplan.org>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      105ddc93
    • Huang Ying's avatar
      mm, /proc/pid/pagemap: fix soft dirty marking for PMD migration entry · b83d7e43
      Huang Ying authored
      When the pagetable is walked in the implementation of /proc/<pid>/pagemap,
      pmd_soft_dirty() is used for both the PMD huge page map and the PMD
      migration entries.  That is wrong, pmd_swp_soft_dirty() should be used
      for the PMD migration entries instead because the different page table
      entry flag is used.
      
      As a result, /proc/pid/pagemap may report incorrect soft dirty information
      for PMD migration entries.
      
      Link: http://lkml.kernel.org/r/20171017081818.31795-1-ying.huang@intel.com
      Fixes: 84c3fc4e ("mm: thp: check pmd migration entry in common path")
      Signed-off-by: default avatar"Huang, Ying" <ying.huang@intel.com>
      Acked-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Acked-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
      Cc: Michal Hocko <mhocko@suse.com>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: "Jérôme Glisse" <jglisse@redhat.com>
      Cc: Daniel Colascione <dancol@google.com>
      Cc: Zi Yan <zi.yan@cs.rutgers.edu>
      Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b83d7e43
    • Andrea Arcangeli's avatar
      userfaultfd: hugetlbfs: prevent UFFDIO_COPY to fill beyond the end of i_size · 1e392147
      Andrea Arcangeli authored
      This oops:
      
        kernel BUG at fs/hugetlbfs/inode.c:484!
        RIP: remove_inode_hugepages+0x3d0/0x410
        Call Trace:
          hugetlbfs_setattr+0xd9/0x130
          notify_change+0x292/0x410
          do_truncate+0x65/0xa0
          do_sys_ftruncate.constprop.3+0x11a/0x180
          SyS_ftruncate+0xe/0x10
          tracesys+0xd9/0xde
      
      was caused by the lack of i_size check in hugetlb_mcopy_atomic_pte.
      
      mmap() can still succeed beyond the end of the i_size after vmtruncate
      zapped vmas in those ranges, but the faults must not succeed, and that
      includes UFFDIO_COPY.
      
      We could differentiate the retval to userland to represent a SIGBUS like
      a page fault would do (vs SIGSEGV), but it doesn't seem very useful and
      we'd need to pick a random retval as there's no meaningful syscall
      retval that would differentiate from SIGSEGV and SIGBUS, there's just
      -EFAULT.
      
      Link: http://lkml.kernel.org/r/20171016223914.2421-2-aarcange@redhat.comSigned-off-by: default avatarAndrea Arcangeli <aarcange@redhat.com>
      Reviewed-by: default avatarMike Kravetz <mike.kravetz@oracle.com>
      Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
      Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      1e392147
    • Florian Fainelli's avatar
      net: systemport: Correct IPG length settings · 93824c80
      Florian Fainelli authored
      Due to a documentation mistake, the IPG length was set to 0x12 while it
      should have been 12 (decimal). This would affect short packet (64B
      typically) performance since the IPG was bigger than necessary.
      
      Fixes: 44a4524c ("net: systemport: Add support for SYSTEMPORT Lite")
      Signed-off-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      93824c80
    • Eric Dumazet's avatar
      tcp: do not mangle skb->cb[] in tcp_make_synack() · 3b117750
      Eric Dumazet authored
      Christoph Paasch sent a patch to address the following issue :
      
      tcp_make_synack() is leaving some TCP private info in skb->cb[],
      then send the packet by other means than tcp_transmit_skb()
      
      tcp_transmit_skb() makes sure to clear skb->cb[] to not confuse
      IPv4/IPV6 stacks, but we have no such cleanup for SYNACK.
      
      tcp_make_synack() should not use tcp_init_nondata_skb() :
      
      tcp_init_nondata_skb() really should be limited to skbs put in write/rtx
      queues (the ones that are only sent via tcp_transmit_skb())
      
      This patch fixes the issue and should even save few cpu cycles ;)
      
      Fixes: 971f10ec ("tcp: better TCP_SKB_CB layout to reduce cache line misses")
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Reported-by: default avatarChristoph Paasch <cpaasch@apple.com>
      Reviewed-by: default avatarChristoph Paasch <cpaasch@apple.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      3b117750
    • Florian Westphal's avatar
      fib: fib_dump_info can no longer use __in_dev_get_rtnl · 25dd169a
      Florian Westphal authored
      syzbot reported yet another regression added with DOIT_UNLOCKED.
      When nexthop is marked as dead, fib_dump_info uses __in_dev_get_rtnl():
      
      ./include/linux/inetdevice.h:230 suspicious rcu_dereference_protected() usage!
      rcu_scheduler_active = 2, debug_locks = 1
      1 lock held by syz-executor2/23859:
       #0:  (rcu_read_lock){....}, at: [<ffffffff840283f0>]
      inet_rtm_getroute+0xaa0/0x2d70 net/ipv4/route.c:2738
      [..]
        lockdep_rcu_suspicious+0x123/0x170 kernel/locking/lockdep.c:4665
        __in_dev_get_rtnl include/linux/inetdevice.h:230 [inline]
        fib_dump_info+0x1136/0x13d0 net/ipv4/fib_semantics.c:1377
        inet_rtm_getroute+0xf97/0x2d70 net/ipv4/route.c:2785
      ..
      
      This isn't safe anymore, callers either hold RTNL mutex or rcu read lock,
      so these spots must use rcu_dereference_rtnl() or plain rcu_derefence()
      (plus unconditional rcu read lock).
      
      This does the latter.
      
      Fixes: 394f51ab ("ipv4: route: set ipv4 RTM_GETROUTE to not use rtnl")
      Reported-by: default avatarsyzbot <syzkaller@googlegroups.com>
      Signed-off-by: default avatarFlorian Westphal <fw@strlen.de>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      25dd169a
    • Bhadram Varka's avatar
      stmmac: use of_property_read_u32 instead of read_u8 · e73b49eb
      Bhadram Varka authored
      Numbers in DT are stored in “cells” which are 32-bits
      in size. of_property_read_u8 does not work properly
      because of endianness problem.
      
      This causes it to always return 0 with little-endian
      architectures.
      
      Fix it by using of_property_read_u32() OF API.
      Signed-off-by: default avatarBhadram Varka <vbhadram@nvidia.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e73b49eb
    • David S. Miller's avatar
      Merge branch 'net-sched-use-after-free' · 2f2b1ae2
      David S. Miller authored
      Cong Wang says:
      
      ====================
      net_sched: fix a use-after-free for tc actions
      
      This patchset fixes a use-after-free reported by Lucas
      and closes potential races too.
      
      Please see each patch for details.
      ====================
      Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      2f2b1ae2
    • Cong Wang's avatar
      net_sched: hold netns refcnt for each action · ceffcc5e
      Cong Wang authored
      TC actions have been destroyed asynchronously for a long time,
      previously in a RCU callback and now in a workqueue. If we
      don't hold a refcnt for its netns, we could use the per netns
      data structure, struct tcf_idrinfo, after it has been freed by
      netns workqueue.
      
      Hold refcnt to ensure netns destroy happens after all actions
      are gone.
      
      Fixes: ddf97ccd ("net_sched: add network namespace support for tc actions")
      Reported-by: default avatarLucas Bates <lucasb@mojatatu.com>
      Tested-by: default avatarLucas Bates <lucasb@mojatatu.com>
      Cc: Jamal Hadi Salim <jhs@mojatatu.com>
      Cc: Jiri Pirko <jiri@resnulli.us>
      Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ceffcc5e
    • Cong Wang's avatar
      net_sched: acquire RTNL in tc_action_net_exit() · a159d3c4
      Cong Wang authored
      I forgot to acquire RTNL in tc_action_net_exit()
      which leads that action ops->cleanup() is not always
      called with RTNL. This usually is not a big deal because
      this function is called after all netns refcnt are gone,
      but given RTNL protects more than just actions, add it
      for safety and consistency.
      
      Also add an assertion to catch other potential bugs.
      
      Fixes: ddf97ccd ("net_sched: add network namespace support for tc actions")
      Reported-by: default avatarLucas Bates <lucasb@mojatatu.com>
      Tested-by: default avatarLucas Bates <lucasb@mojatatu.com>
      Cc: Jamal Hadi Salim <jhs@mojatatu.com>
      Cc: Jiri Pirko <jiri@resnulli.us>
      Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      a159d3c4
  2. 02 Nov, 2017 19 commits
    • Madhavan Srinivasan's avatar
      powerpc/perf: Fix core-imc hotplug callback failure during imc initialization · 7ecb37f6
      Madhavan Srinivasan authored
      Call trace observed during boot:
      
        nest_capp0_imc performance monitor hardware support registered
        nest_capp1_imc performance monitor hardware support registered
        core_imc memory allocation for cpu 56 failed
        Unable to handle kernel paging request for data at address 0xffa400010
        Faulting instruction address: 0xc000000000bf3294
        0:mon> e
        cpu 0x0: Vector: 300 (Data Access) at [c000000ff38ff8d0]
            pc: c000000000bf3294: mutex_lock+0x34/0x90
            lr: c000000000bf3288: mutex_lock+0x28/0x90
            sp: c000000ff38ffb50
           msr: 9000000002009033
           dar: ffa400010
         dsisr: 80000
          current = 0xc000000ff383de00
          paca    = 0xc000000007ae0000	 softe: 0	 irq_happened: 0x01
            pid   = 13, comm = cpuhp/0
        Linux version 4.11.0-39.el7a.ppc64le (mockbuild@ppc-058.build.eng.bos.redhat.com) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-16) (GCC) ) #1 SMP Tue Oct 3 07:42:44 EDT 2017
        0:mon> t
        [c000000ff38ffb80] c0000000002ddfac perf_pmu_migrate_context+0xac/0x470
        [c000000ff38ffc40] c00000000011385c ppc_core_imc_cpu_offline+0x1ac/0x1e0
        [c000000ff38ffc90] c000000000125758 cpuhp_invoke_callback+0x198/0x5d0
        [c000000ff38ffd00] c00000000012782c cpuhp_thread_fun+0x8c/0x3d0
        [c000000ff38ffd60] c0000000001678d0 smpboot_thread_fn+0x290/0x2a0
        [c000000ff38ffdc0] c00000000015ee78 kthread+0x168/0x1b0
        [c000000ff38ffe30] c00000000000b368 ret_from_kernel_thread+0x5c/0x74
      
      While registering the cpuhoplug callbacks for core-imc, if we fails
      in the cpuhotplug online path for any random core (either because opal call to
      initialize the core-imc counters fails or because memory allocation fails for
      that core), ppc_core_imc_cpu_offline() will get invoked for other cpus who
      successfully returned from cpuhotplug online path.
      
      But in the ppc_core_imc_cpu_offline() path we are trying to migrate the event
      context, when core-imc counters are not even initialized. Thus creating the
      above stack dump.
      
      Add a check to see if core-imc counters are enabled or not in the cpuhotplug
      offline path before migrating the context to handle this failing scenario.
      
      Fixes: 885dcd70 ("powerpc/perf: Add nest IMC PMU support")
      Signed-off-by: default avatarMadhavan Srinivasan <maddy@linux.vnet.ibm.com>
      Signed-off-by: default avatarAnju T Sudhakar <anju@linux.vnet.ibm.com>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      7ecb37f6
    • Linus Torvalds's avatar
      Kbuild: don't pass "-C" to preprocessor when processing linker scripts · 5cb0512c
      Linus Torvalds authored
      For some odd historical reason, we preprocessed the linker scripts with
      "-C", which keeps comments around.  That makes no sense, since the
      comments are not meaningful for the build anyway.
      
      And it actually breaks things, since linker scripts can't have C++ style
      "//" comments in them, so keeping comments after preprocessing now
      limits us in odd and surprising ways in our header files for no good
      reason.
      
      The -C option goes back to pre-git and pre-bitkeeper times, but seems to
      have been historically used (along with "-traditional") for some
      odd-ball architectures (ia64, MIPS and SH).  It probably didn't matter
      back then either, but might possibly have been used to minimize the
      difference between the original file and the pre-processed result.
      
      The reason for this may be lost in time, but let's not perpetuate it
      only because we can't remember why we did this crazy thing.
      
      This was triggered by the recent addition of SPDX lines to the source
      tree, where people apparently were confused about why header files
      couldn't use the C++ comment format.
      
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Greg KH <gregkh@linuxfoundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      5cb0512c
    • Linus Torvalds's avatar
      Revert "x86: do not use cpufreq_quick_get() for /proc/cpuinfo "cpu MHz"" · 890da9cf
      Linus Torvalds authored
      This reverts commit 51204e06.
      
      There wasn't really any good reason for it, and people are complaining
      (rightly) that it broke existing practice.
      
      Cc: Len Brown <len.brown@intel.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      890da9cf
    • Linus Torvalds's avatar
      Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux · 6daa0839
      Linus Torvalds authored
      Pull arm64 fix from Catalin Marinas:
       "Check addr_limit in arm64 __dump_instr()"
      
      * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
        arm64: ensure __dump_instr() checks addr_limit
      6daa0839
    • Mark Rutland's avatar
      arm64: ensure __dump_instr() checks addr_limit · 7a7003b1
      Mark Rutland authored
      It's possible for a user to deliberately trigger __dump_instr with a
      chosen kernel address.
      
      Let's avoid problems resulting from this by using get_user() rather than
      __get_user(), ensuring that we don't erroneously access kernel memory.
      
      Where we use __dump_instr() on kernel text, we already switch to
      KERNEL_DS, so this shouldn't adversely affect those cases.
      
      Fixes: 60ffc30d ("arm64: Exception handling")
      Cc: stable@vger.kernel.org
      Acked-by: default avatarWill Deacon <will.deacon@arm.com>
      Signed-off-by: default avatarMark Rutland <mark.rutland@arm.com>
      Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      7a7003b1
    • Linus Torvalds's avatar
      Merge tag 'spdx_identifiers-4.14-rc8' of... · ead75150
      Linus Torvalds authored
      Merge tag 'spdx_identifiers-4.14-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
      
      Pull initial SPDX identifiers from Greg KH:
       "License cleanup: add SPDX license identifiers to some files
      
        Many source files in the tree are missing licensing information, which
        makes it harder for compliance tools to determine the correct license.
      
        By default all files without license information are under the default
        license of the kernel, which is GPL version 2.
      
        Update the files which contain no license information with the
        'GPL-2.0' SPDX license identifier. The SPDX identifier is a legally
        binding shorthand, which can be used instead of the full boiler plate
        text.
      
        This patch is based on work done by Thomas Gleixner and Kate Stewart
        and Philippe Ombredanne.
      
        How this work was done:
      
        Patches were generated and checked against linux-4.14-rc6 for a subset
        of the use cases:
      
         - file had no licensing information it it.
      
         - file was a */uapi/* one with no licensing information in it,
      
         - file was a */uapi/* one with existing licensing information,
      
        Further patches will be generated in subsequent months to fix up cases
        where non-standard license headers were used, and references to
        license had to be inferred by heuristics based on keywords.
      
        The analysis to determine which SPDX License Identifier to be applied
        to a file was done in a spreadsheet of side by side results from of
        the output of two independent scanners (ScanCode & Windriver)
        producing SPDX tag:value files created by Philippe Ombredanne.
        Philippe prepared the base worksheet, and did an initial spot review
        of a few 1000 files.
      
        The 4.13 kernel was the starting point of the analysis with 60,537
        files assessed. Kate Stewart did a file by file comparison of the
        scanner results in the spreadsheet to determine which SPDX license
        identifier(s) to be applied to the file. She confirmed any
        determination that was not immediately clear with lawyers working with
        the Linux Foundation.
      
        Criteria used to select files for SPDX license identifier tagging was:
      
         - Files considered eligible had to be source code files.
      
         - Make and config files were included as candidates if they contained
           >5 lines of source
      
         - File already had some variant of a license header in it (even if <5
           lines).
      
        All documentation files were explicitly excluded.
      
        The following heuristics were used to determine which SPDX license
        identifiers to apply.
      
         - when both scanners couldn't find any license traces, file was
           considered to have no license information in it, and the top level
           COPYING file license applied.
      
           For non */uapi/* files that summary was:
      
             SPDX license identifier                            # files
             ---------------------------------------------------|-------
             GPL-2.0                                              11139
      
           and resulted in the first patch in this series.
      
           If that file was a */uapi/* path one, it was "GPL-2.0 WITH
           Linux-syscall-note" otherwise it was "GPL-2.0". Results of that
           was:
      
             SPDX license identifier                            # files
             ---------------------------------------------------|-------
             GPL-2.0 WITH Linux-syscall-note                        930
      
           and resulted in the second patch in this series.
      
         - if a file had some form of licensing information in it, and was one
           of the */uapi/* ones, it was denoted with the Linux-syscall-note if
           any GPL family license was found in the file or had no licensing in
           it (per prior point). Results summary:
      
             SPDX license identifier                            # files
             ---------------------------------------------------|------
             GPL-2.0 WITH Linux-syscall-note                       270
             GPL-2.0+ WITH Linux-syscall-note                      169
             ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
             ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
             LGPL-2.1+ WITH Linux-syscall-note                      15
             GPL-1.0+ WITH Linux-syscall-note                       14
             ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
             LGPL-2.0+ WITH Linux-syscall-note                       4
             LGPL-2.1 WITH Linux-syscall-note                        3
             ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
             ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1
      
           and that resulted in the third patch in this series.
      
         - when the two scanners agreed on the detected license(s), that
           became the concluded license(s).
      
         - when there was disagreement between the two scanners (one detected
           a license but the other didn't, or they both detected different
           licenses) a manual inspection of the file occurred.
      
         - In most cases a manual inspection of the information in the file
           resulted in a clear resolution of the license that should apply
           (and which scanner probably needed to revisit its heuristics).
      
         - When it was not immediately clear, the license identifier was
           confirmed with lawyers working with the Linux Foundation.
      
         - If there was any question as to the appropriate license identifier,
           the file was flagged for further research and to be revisited later
           in time.
      
        In total, over 70 hours of logged manual review was done on the
        spreadsheet to determine the SPDX license identifiers to apply to the
        source files by Kate, Philippe, Thomas and, in some cases,
        confirmation by lawyers working with the Linux Foundation.
      
        Kate also obtained a third independent scan of the 4.13 code base from
        FOSSology, and compared selected files where the other two scanners
        disagreed against that SPDX file, to see if there was new insights.
        The Windriver scanner is based on an older version of FOSSology in
        part, so they are related.
      
        Thomas did random spot checks in about 500 files from the spreadsheets
        for the uapi headers and agreed with SPDX license identifier in the
        files he inspected. For the non-uapi files Thomas did random spot
        checks in about 15000 files.
      
        In initial set of patches against 4.14-rc6, 3 files were found to have
        copy/paste license identifier errors, and have been fixed to reflect
        the correct identifier.
      
        Additionally Philippe spent 10 hours this week doing a detailed manual
        inspection and review of the 12,461 patched files from the initial
        patch version early this week with:
      
         - a full scancode scan run, collecting the matched texts, detected
           license ids and scores
      
         - reviewing anything where there was a license detected (about 500+
           files) to ensure that the applied SPDX license was correct
      
         - reviewing anything where there was no detection but the patch
           license was not GPL-2.0 WITH Linux-syscall-note to ensure that the
           applied SPDX license was correct
      
        This produced a worksheet with 20 files needing minor correction. This
        worksheet was then exported into 3 different .csv files for the
        different types of files to be modified.
      
        These .csv files were then reviewed by Greg. Thomas wrote a script to
        parse the csv files and add the proper SPDX tag to the file, in the
        format that the file expected. This script was further refined by Greg
        based on the output to detect more types of files automatically and to
        distinguish between header and source .c files (which need different
        comment types.) Finally Greg ran the script using the .csv files to
        generate the patches.
      Reviewed-by: default avatarKate Stewart <kstewart@linuxfoundation.org>
      Reviewed-by: default avatarPhilippe Ombredanne <pombredanne@nexb.com>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
        Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>"
      
      * tag 'spdx_identifiers-4.14-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
        License cleanup: add SPDX license identifier to uapi header files with a license
        License cleanup: add SPDX license identifier to uapi header files with no license
        License cleanup: add SPDX GPL-2.0 license identifier to files with no license
      ead75150
    • Linus Torvalds's avatar
      Merge tag 'linux-kselftest-4.14-rc7' of... · fdebad11
      Linus Torvalds authored
      Merge tag 'linux-kselftest-4.14-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest
      
      Pull kselftest fix from Shuah Khan:
       "This consists of a single fix to a regression to printing individual
        test results to the console. An earlier commit changed it to printing
        just the summary of results, which will negatively impact users that
        rely on console log to look at the individual test failures.
      
        This fix makes it optional to print summary and by default results get
        printed to the console"
      
      * tag 'linux-kselftest-4.14-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
        selftests: lib.mk: print individual test results to console by default
      fdebad11
    • Linus Torvalds's avatar
      Merge tag 'sound-4.14-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound · 0f07e10f
      Linus Torvalds authored
      Pull sound fixes from Takashi Iwai:
       "Unfortunately we still have received a significant amount of changes
        at the late stage, but at least all are small and clear fixes.
      
        There are two fixes for ALSA core stuff, yet another timer race fix
        and sequencer lockdep annotation fix. Both are spotted by syzkaller,
        and not too serious but better to paper over quickly.
      
        All other commits are about ASoC drivers, most notably, a revert of
        RT5514 hotword control that was included in 4.14-rc (due to a kind of
        abuse of kctl TLV ABI), together with topology API fixes and other
        device-specific small fixes that should go for stable, too"
      
      * tag 'sound-4.14-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
        ALSA: seq: Fix nested rwsem annotation for lockdep splat
        ALSA: timer: Add missing mutex lock for compat ioctls
        ASoC: rt5616: fix 0x91 default value
        ASoC: rt5659: connect LOUT Amp with Charge Pump
        ASoC: rt5659: register power bit of LOUT Amp
        ASoC: rt5663: Change the dev getting function in rt5663_irq
        ASoC: rt5514: Revert Hotword Model control
        ASoC: topology: Fix a potential memory leak in 'soc_tplg_dapm_widget_denum_create()'
        ASoC: topology: Fix a potential NULL pointer dereference in 'soc_tplg_dapm_widget_denum_create()'
        ASoC: rt5514-spi: check irq status to schedule data copy
        ASoC: adau17x1: Workaround for noise bug in ADC
      0f07e10f
    • Linus Torvalds's avatar
      Merge branch 'fixes-v4.14-rc7' of... · 6965f1aa
      Linus Torvalds authored
      Merge branch 'fixes-v4.14-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security
      
      Pull key handling fixes from James Morris:
       "Fixes for the Keys subsystem by Eric Biggers"
      
      * 'fixes-v4.14-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
        KEYS: fix out-of-bounds read during ASN.1 parsing
        KEYS: trusted: fix writing past end of buffer in trusted_read()
        KEYS: return full count in keyring_read() if buffer is too small
      6965f1aa
    • Jiri Slaby's avatar
      futex: futex_wake_op, do not fail on invalid op · e78c38f6
      Jiri Slaby authored
      In commit 30d6e0a4 ("futex: Remove duplicated code and fix undefined
      behaviour"), I let FUTEX_WAKE_OP to fail on invalid op.  Namely when op
      should be considered as shift and the shift is out of range (< 0 or > 31).
      
      But strace's test suite does this madness:
      
        futex(0x7fabd78bcffc, 0x5, 0xfacefeed, 0xb, 0x7fabd78bcffc, 0xa0caffee);
        futex(0x7fabd78bcffc, 0x5, 0xfacefeed, 0xb, 0x7fabd78bcffc, 0xbadfaced);
        futex(0x7fabd78bcffc, 0x5, 0xfacefeed, 0xb, 0x7fabd78bcffc, 0xffffffff);
      
      When I pick the first 0xa0caffee, it decodes as:
      
        0x80000000 & 0xa0caffee: oparg is shift
        0x70000000 & 0xa0caffee: op is FUTEX_OP_OR
        0x0f000000 & 0xa0caffee: cmp is FUTEX_OP_CMP_EQ
        0x00fff000 & 0xa0caffee: oparg is sign-extended 0xcaf = -849
        0x00000fff & 0xa0caffee: cmparg is sign-extended 0xfee = -18
      
      That means the op tries to do this:
      
        (futex |= (1 << (-849))) == -18
      
      which is completely bogus. The new check of op in the code is:
      
              if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) {
                      if (oparg < 0 || oparg > 31)
                              return -EINVAL;
                      oparg = 1 << oparg;
              }
      
      which results obviously in the "Invalid argument" errno:
      
        FAIL: futex
        ===========
      
        futex(0x7fabd78bcffc, 0x5, 0xfacefeed, 0xb, 0x7fabd78bcffc, 0xa0caffee) = -1: Invalid argument
        futex.test: failed test: ../futex failed with code 1
      
      So let us soften the failure to print only a (ratelimited) message, crop
      the value and continue as if it were right.  When userspace keeps up, we
      can switch this to return -EINVAL again.
      
      [v2] Do not return 0 immediatelly, proceed with the cropped value.
      
      Fixes: 30d6e0a4 ("futex: Remove duplicated code and fix undefined behaviour")
      Signed-off-by: default avatarJiri Slaby <jslaby@suse.cz>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Darren Hart <dvhart@infradead.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e78c38f6
    • Greg Kroah-Hartman's avatar
      License cleanup: add SPDX license identifier to uapi header files with a license · e2be04c7
      Greg Kroah-Hartman authored
      Many user space API headers have licensing information, which is either
      incomplete, badly formatted or just a shorthand for referring to the
      license under which the file is supposed to be.  This makes it hard for
      compliance tools to determine the correct license.
      
      Update these files with an SPDX license identifier.  The identifier was
      chosen based on the license information in the file.
      
      GPL/LGPL licensed headers get the matching GPL/LGPL SPDX license
      identifier with the added 'WITH Linux-syscall-note' exception, which is
      the officially assigned exception identifier for the kernel syscall
      exception:
      
         NOTE! This copyright does *not* cover user programs that use kernel
         services by normal system calls - this is merely considered normal use
         of the kernel, and does *not* fall under the heading of "derived work".
      
      This exception makes it possible to include GPL headers into non GPL
      code, without confusing license compliance tools.
      
      Headers which have either explicit dual licensing or are just licensed
      under a non GPL license are updated with the corresponding SPDX
      identifier and the GPLv2 with syscall exception identifier.  The format
      is:
              ((GPL-2.0 WITH Linux-syscall-note) OR SPDX-ID-OF-OTHER-LICENSE)
      
      SPDX license identifiers are a legally binding shorthand, which can be
      used instead of the full boiler plate text.  The update does not remove
      existing license information as this has to be done on a case by case
      basis and the copyright holders might have to be consulted. This will
      happen in a separate step.
      
      This patch is based on work done by Thomas Gleixner and Kate Stewart and
      Philippe Ombredanne.  See the previous patch in this series for the
      methodology of how this patch was researched.
      Reviewed-by: default avatarKate Stewart <kstewart@linuxfoundation.org>
      Reviewed-by: default avatarPhilippe Ombredanne <pombredanne@nexb.com>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      e2be04c7
    • Greg Kroah-Hartman's avatar
      License cleanup: add SPDX license identifier to uapi header files with no license · 6f52b16c
      Greg Kroah-Hartman authored
      Many user space API headers are missing licensing information, which
      makes it hard for compliance tools to determine the correct license.
      
      By default are files without license information under the default
      license of the kernel, which is GPLV2.  Marking them GPLV2 would exclude
      them from being included in non GPLV2 code, which is obviously not
      intended. The user space API headers fall under the syscall exception
      which is in the kernels COPYING file:
      
         NOTE! This copyright does *not* cover user programs that use kernel
         services by normal system calls - this is merely considered normal use
         of the kernel, and does *not* fall under the heading of "derived work".
      
      otherwise syscall usage would not be possible.
      
      Update the files which contain no license information with an SPDX
      license identifier.  The chosen identifier is 'GPL-2.0 WITH
      Linux-syscall-note' which is the officially assigned identifier for the
      Linux syscall exception.  SPDX license identifiers are a legally binding
      shorthand, which can be used instead of the full boiler plate text.
      
      This patch is based on work done by Thomas Gleixner and Kate Stewart and
      Philippe Ombredanne.  See the previous patch in this series for the
      methodology of how this patch was researched.
      Reviewed-by: default avatarKate Stewart <kstewart@linuxfoundation.org>
      Reviewed-by: default avatarPhilippe Ombredanne <pombredanne@nexb.com>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      6f52b16c
    • Greg Kroah-Hartman's avatar
      License cleanup: add SPDX GPL-2.0 license identifier to files with no license · b2441318
      Greg Kroah-Hartman authored
      Many source files in the tree are missing licensing information, which
      makes it harder for compliance tools to determine the correct license.
      
      By default all files without license information are under the default
      license of the kernel, which is GPL version 2.
      
      Update the files which contain no license information with the 'GPL-2.0'
      SPDX license identifier.  The SPDX identifier is a legally binding
      shorthand, which can be used instead of the full boiler plate text.
      
      This patch is based on work done by Thomas Gleixner and Kate Stewart and
      Philippe Ombredanne.
      
      How this work was done:
      
      Patches were generated and checked against linux-4.14-rc6 for a subset of
      the use cases:
       - file had no licensing information it it.
       - file was a */uapi/* one with no licensing information in it,
       - file was a */uapi/* one with existing licensing information,
      
      Further patches will be generated in subsequent months to fix up cases
      where non-standard license headers were used, and references to license
      had to be inferred by heuristics based on keywords.
      
      The analysis to determine which SPDX License Identifier to be applied to
      a file was done in a spreadsheet of side by side results from of the
      output of two independent scanners (ScanCode & Windriver) producing SPDX
      tag:value files created by Philippe Ombredanne.  Philippe prepared the
      base worksheet, and did an initial spot review of a few 1000 files.
      
      The 4.13 kernel was the starting point of the analysis with 60,537 files
      assessed.  Kate Stewart did a file by file comparison of the scanner
      results in the spreadsheet to determine which SPDX license identifier(s)
      to be applied to the file. She confirmed any determination that was not
      immediately clear with lawyers working with the Linux Foundation.
      
      Criteria used to select files for SPDX license identifier tagging was:
       - Files considered eligible had to be source code files.
       - Make and config files were included as candidates if they contained >5
         lines of source
       - File already had some variant of a license header in it (even if <5
         lines).
      
      All documentation files were explicitly excluded.
      
      The following heuristics were used to determine which SPDX license
      identifiers to apply.
      
       - when both scanners couldn't find any license traces, file was
         considered to have no license information in it, and the top level
         COPYING file license applied.
      
         For non */uapi/* files that summary was:
      
         SPDX license identifier                            # files
         ---------------------------------------------------|-------
         GPL-2.0                                              11139
      
         and resulted in the first patch in this series.
      
         If that file was a */uapi/* path one, it was "GPL-2.0 WITH
         Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:
      
         SPDX license identifier                            # files
         ---------------------------------------------------|-------
         GPL-2.0 WITH Linux-syscall-note                        930
      
         and resulted in the second patch in this series.
      
       - if a file had some form of licensing information in it, and was one
         of the */uapi/* ones, it was denoted with the Linux-syscall-note if
         any GPL family license was found in the file or had no licensing in
         it (per prior point).  Results summary:
      
         SPDX license identifier                            # files
         ---------------------------------------------------|------
         GPL-2.0 WITH Linux-syscall-note                       270
         GPL-2.0+ WITH Linux-syscall-note                      169
         ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
         ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
         LGPL-2.1+ WITH Linux-syscall-note                      15
         GPL-1.0+ WITH Linux-syscall-note                       14
         ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
         LGPL-2.0+ WITH Linux-syscall-note                       4
         LGPL-2.1 WITH Linux-syscall-note                        3
         ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
         ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1
      
         and that resulted in the third patch in this series.
      
       - when the two scanners agreed on the detected license(s), that became
         the concluded license(s).
      
       - when there was disagreement between the two scanners (one detected a
         license but the other didn't, or they both detected different
         licenses) a manual inspection of the file occurred.
      
       - In most cases a manual inspection of the information in the file
         resulted in a clear resolution of the license that should apply (and
         which scanner probably needed to revisit its heuristics).
      
       - When it was not immediately clear, the license identifier was
         confirmed with lawyers working with the Linux Foundation.
      
       - If there was any question as to the appropriate license identifier,
         the file was flagged for further research and to be revisited later
         in time.
      
      In total, over 70 hours of logged manual review was done on the
      spreadsheet to determine the SPDX license identifiers to apply to the
      source files by Kate, Philippe, Thomas and, in some cases, confirmation
      by lawyers working with the Linux Foundation.
      
      Kate also obtained a third independent scan of the 4.13 code base from
      FOSSology, and compared selected files where the other two scanners
      disagreed against that SPDX file, to see if there was new insights.  The
      Windriver scanner is based on an older version of FOSSology in part, so
      they are related.
      
      Thomas did random spot checks in about 500 files from the spreadsheets
      for the uapi headers and agreed with SPDX license identifier in the
      files he inspected. For the non-uapi files Thomas did random spot checks
      in about 15000 files.
      
      In initial set of patches against 4.14-rc6, 3 files were found to have
      copy/paste license identifier errors, and have been fixed to reflect the
      correct identifier.
      
      Additionally Philippe spent 10 hours this week doing a detailed manual
      inspection and review of the 12,461 patched files from the initial patch
      version early this week with:
       - a full scancode scan run, collecting the matched texts, detected
         license ids and scores
       - reviewing anything where there was a license detected (about 500+
         files) to ensure that the applied SPDX license was correct
       - reviewing anything where there was no detection but the patch license
         was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
         SPDX license was correct
      
      This produced a worksheet with 20 files needing minor correction.  This
      worksheet was then exported into 3 different .csv files for the
      different types of files to be modified.
      
      These .csv files were then reviewed by Greg.  Thomas wrote a script to
      parse the csv files and add the proper SPDX tag to the file, in the
      format that the file expected.  This script was further refined by Greg
      based on the output to detect more types of files automatically and to
      distinguish between header and source .c files (which need different
      comment types.)  Finally Greg ran the script using the .csv files to
      generate the patches.
      Reviewed-by: default avatarKate Stewart <kstewart@linuxfoundation.org>
      Reviewed-by: default avatarPhilippe Ombredanne <pombredanne@nexb.com>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      b2441318
    • Eric Biggers's avatar
      KEYS: fix out-of-bounds read during ASN.1 parsing · 2eb9eabf
      Eric Biggers authored
      syzkaller with KASAN reported an out-of-bounds read in
      asn1_ber_decoder().  It can be reproduced by the following command,
      assuming CONFIG_X509_CERTIFICATE_PARSER=y and CONFIG_KASAN=y:
      
          keyctl add asymmetric desc $'\x30\x30' @s
      
      The bug is that the length of an ASN.1 data value isn't validated in the
      case where it is encoded using the short form, causing the decoder to
      read past the end of the input buffer.  Fix it by validating the length.
      
      The bug report was:
      
          BUG: KASAN: slab-out-of-bounds in asn1_ber_decoder+0x10cb/0x1730 lib/asn1_decoder.c:233
          Read of size 1 at addr ffff88003cccfa02 by task syz-executor0/6818
      
          CPU: 1 PID: 6818 Comm: syz-executor0 Not tainted 4.14.0-rc7-00008-g5f479447 #2
          Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
          Call Trace:
           __dump_stack lib/dump_stack.c:16 [inline]
           dump_stack+0xb3/0x10b lib/dump_stack.c:52
           print_address_description+0x79/0x2a0 mm/kasan/report.c:252
           kasan_report_error mm/kasan/report.c:351 [inline]
           kasan_report+0x236/0x340 mm/kasan/report.c:409
           __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:427
           asn1_ber_decoder+0x10cb/0x1730 lib/asn1_decoder.c:233
           x509_cert_parse+0x1db/0x650 crypto/asymmetric_keys/x509_cert_parser.c:89
           x509_key_preparse+0x64/0x7a0 crypto/asymmetric_keys/x509_public_key.c:174
           asymmetric_key_preparse+0xcb/0x1a0 crypto/asymmetric_keys/asymmetric_type.c:388
           key_create_or_update+0x347/0xb20 security/keys/key.c:855
           SYSC_add_key security/keys/keyctl.c:122 [inline]
           SyS_add_key+0x1cd/0x340 security/keys/keyctl.c:62
           entry_SYSCALL_64_fastpath+0x1f/0xbe
          RIP: 0033:0x447c89
          RSP: 002b:00007fca7a5d3bd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8
          RAX: ffffffffffffffda RBX: 00007fca7a5d46cc RCX: 0000000000447c89
          RDX: 0000000020006f4a RSI: 0000000020006000 RDI: 0000000020001ff5
          RBP: 0000000000000046 R08: fffffffffffffffd R09: 0000000000000000
          R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
          R13: 0000000000000000 R14: 00007fca7a5d49c0 R15: 00007fca7a5d4700
      
      Fixes: 42d5ec27 ("X.509: Add an ASN.1 decoder")
      Cc: <stable@vger.kernel.org> # v3.7+
      Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarJames Morris <james.l.morris@oracle.com>
      2eb9eabf
    • Eric Biggers's avatar
      KEYS: trusted: fix writing past end of buffer in trusted_read() · a3c812f7
      Eric Biggers authored
      When calling keyctl_read() on a key of type "trusted", if the
      user-supplied buffer was too small, the kernel ignored the buffer length
      and just wrote past the end of the buffer, potentially corrupting
      userspace memory.  Fix it by instead returning the size required, as per
      the documentation for keyctl_read().
      
      We also don't even fill the buffer at all in this case, as this is
      slightly easier to implement than doing a short read, and either
      behavior appears to be permitted.  It also makes it match the behavior
      of the "encrypted" key type.
      
      Fixes: d00a1c72 ("keys: add new trusted key-type")
      Reported-by: default avatarBen Hutchings <ben@decadent.org.uk>
      Cc: <stable@vger.kernel.org> # v2.6.38+
      Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Reviewed-by: default avatarMimi Zohar <zohar@linux.vnet.ibm.com>
      Reviewed-by: default avatarJames Morris <james.l.morris@oracle.com>
      Signed-off-by: default avatarJames Morris <james.l.morris@oracle.com>
      a3c812f7
    • Eric Biggers's avatar
      KEYS: return full count in keyring_read() if buffer is too small · 3239b6f2
      Eric Biggers authored
      Commit e645016a ("KEYS: fix writing past end of user-supplied buffer
      in keyring_read()") made keyring_read() stop corrupting userspace memory
      when the user-supplied buffer is too small.  However it also made the
      return value in that case be the short buffer size rather than the size
      required, yet keyctl_read() is actually documented to return the size
      required.  Therefore, switch it over to the documented behavior.
      
      Note that for now we continue to have it fill the short buffer, since it
      did that before (pre-v3.13) and dump_key_tree_aux() in keyutils arguably
      relies on it.
      
      Fixes: e645016a ("KEYS: fix writing past end of user-supplied buffer in keyring_read()")
      Reported-by: default avatarBen Hutchings <ben@decadent.org.uk>
      Cc: <stable@vger.kernel.org> # v3.13+
      Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Reviewed-by: default avatarJames Morris <james.l.morris@oracle.com>
      Signed-off-by: default avatarJames Morris <james.l.morris@oracle.com>
      3239b6f2
    • David S. Miller's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf · 74784da8
      David S. Miller authored
      Pablo Neira Ayuso says:
      
      ====================
      Netfilter fixes for net
      
      The following patchset contains two one-liner fixes for your net tree,
      they are:
      
      1) Disable fast hash operations for 2-bytes length keys which is leading
         to incorrect lookups in nf_tables, from Anatole Denis.
      
      2) Reload pointer ipv4 header after ip_route_me_harder() given this may
         result in use-after-free due to skbuff header reallocation, patch
         from Tejaswi Tanikella.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      74784da8
    • Jeff Barnhill's avatar
      net: vrf: correct FRA_L3MDEV encode type · 18129a24
      Jeff Barnhill authored
      FRA_L3MDEV is defined as U8, but is being added as a U32 attribute. On
      big endian architecture, this results in the l3mdev entry not being
      added to the FIB rules.
      
      Fixes: 1aa6c4f6 ("net: vrf: Add l3mdev rules on first device create")
      Signed-off-by: default avatarJeff Barnhill <0xeffeff@gmail.com>
      Acked-by: default avatarDavid Ahern <dsahern@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      18129a24
    • Konstantin Khlebnikov's avatar
      tcp_nv: fix division by zero in tcpnv_acked() · 4eebff27
      Konstantin Khlebnikov authored
      Average RTT could become zero. This happened in real life at least twice.
      This patch treats zero as 1us.
      Signed-off-by: default avatarKonstantin Khlebnikov <khlebnikov@yandex-team.ru>
      Acked-by: default avatarLawrence Brakmo <Brakmo@fb.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      4eebff27