1. 21 Jul, 2017 40 commits
    • Kees Cook's avatar
      exec: Limit arg stack to at most 75% of _STK_LIM · f31c4f65
      Kees Cook authored
      commit da029c11 upstream.
      
      To avoid pathological stack usage or the need to special-case setuid
      execs, just limit all arg stack usage to at most 75% of _STK_LIM (6MB).
      Signed-off-by: default avatarKees Cook <keescook@chromium.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      f31c4f65
    • Kees Cook's avatar
      s390: reduce ELF_ET_DYN_BASE · fbc877cd
      Kees Cook authored
      commit a73dc537 upstream.
      
      Now that explicitly executed loaders are loaded in the mmap region, we
      have more freedom to decide where we position PIE binaries in the
      address space to avoid possible collisions with mmap or stack regions.
      
      For 64-bit, align to 4GB to allow runtimes to use the entire 32-bit
      address space for 32-bit pointers.  On 32-bit use 4MB, which is the
      traditional x86 minimum load location, likely to avoid historically
      requiring a 4MB page table entry when only a portion of the first 4MB
      would be used (since the NULL address is avoided).  For s390 the
      position could be 0x10000, but that is needlessly close to the NULL
      address.
      
      Link: http://lkml.kernel.org/r/1498154792-49952-5-git-send-email-keescook@chromium.orgSigned-off-by: default avatarKees Cook <keescook@chromium.org>
      Cc: Russell King <linux@armlinux.org.uk>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Will Deacon <will.deacon@arm.com>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Michael Ellerman <mpe@ellerman.id.au>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: James Hogan <james.hogan@imgtec.com>
      Cc: Pratyush Anand <panand@redhat.com>
      Cc: Ingo Molnar <mingo@kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      fbc877cd
    • Kees Cook's avatar
      powerpc: move ELF_ET_DYN_BASE to 4GB / 4MB · 90fb0f7a
      Kees Cook authored
      commit 47ebb09d upstream.
      
      Now that explicitly executed loaders are loaded in the mmap region, we
      have more freedom to decide where we position PIE binaries in the
      address space to avoid possible collisions with mmap or stack regions.
      
      For 64-bit, align to 4GB to allow runtimes to use the entire 32-bit
      address space for 32-bit pointers.  On 32-bit use 4MB, which is the
      traditional x86 minimum load location, likely to avoid historically
      requiring a 4MB page table entry when only a portion of the first 4MB
      would be used (since the NULL address is avoided).
      
      Link: http://lkml.kernel.org/r/1498154792-49952-4-git-send-email-keescook@chromium.orgSigned-off-by: default avatarKees Cook <keescook@chromium.org>
      Tested-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      Acked-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      Cc: Russell King <linux@armlinux.org.uk>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Will Deacon <will.deacon@arm.com>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: James Hogan <james.hogan@imgtec.com>
      Cc: Pratyush Anand <panand@redhat.com>
      Cc: Ingo Molnar <mingo@kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      90fb0f7a
    • Kees Cook's avatar
      arm64: move ELF_ET_DYN_BASE to 4GB / 4MB · 70779e0e
      Kees Cook authored
      commit 02445990 upstream.
      
      Now that explicitly executed loaders are loaded in the mmap region, we
      have more freedom to decide where we position PIE binaries in the
      address space to avoid possible collisions with mmap or stack regions.
      
      For 64-bit, align to 4GB to allow runtimes to use the entire 32-bit
      address space for 32-bit pointers.  On 32-bit use 4MB, to match ARM.
      This could be 0x8000, the standard ET_EXEC load address, but that is
      needlessly close to the NULL address, and anyone running arm compat PIE
      will have an MMU, so the tight mapping is not needed.
      
      Link: http://lkml.kernel.org/r/1498251600-132458-4-git-send-email-keescook@chromium.orgSigned-off-by: default avatarKees Cook <keescook@chromium.org>
      Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Mark Rutland <mark.rutland@arm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      70779e0e
    • Kees Cook's avatar
      arm: move ELF_ET_DYN_BASE to 4MB · abb79a56
      Kees Cook authored
      commit 6a9af90a upstream.
      
      Now that explicitly executed loaders are loaded in the mmap region, we
      have more freedom to decide where we position PIE binaries in the
      address space to avoid possible collisions with mmap or stack regions.
      
      4MB is chosen here mainly to have parity with x86, where this is the
      traditional minimum load location, likely to avoid historically
      requiring a 4MB page table entry when only a portion of the first 4MB
      would be used (since the NULL address is avoided).
      
      For ARM the position could be 0x8000, the standard ET_EXEC load address,
      but that is needlessly close to the NULL address, and anyone running PIE
      on 32-bit ARM will have an MMU, so the tight mapping is not needed.
      
      Link: http://lkml.kernel.org/r/1498154792-49952-2-git-send-email-keescook@chromium.orgSigned-off-by: default avatarKees Cook <keescook@chromium.org>
      Cc: Russell King <linux@armlinux.org.uk>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Will Deacon <will.deacon@arm.com>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Michael Ellerman <mpe@ellerman.id.au>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: James Hogan <james.hogan@imgtec.com>
      Cc: Pratyush Anand <panand@redhat.com>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Daniel Micay <danielmicay@gmail.com>
      Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
      Cc: Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com>
      Cc: Kees Cook <keescook@chromium.org>
      Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
      Cc: Qualys Security Advisory <qsa@qualys.com>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      abb79a56
    • Kees Cook's avatar
      binfmt_elf: use ELF_ET_DYN_BASE only for PIE · 63c2f8f8
      Kees Cook authored
      commit eab09532 upstream.
      
      The ELF_ET_DYN_BASE position was originally intended to keep loaders
      away from ET_EXEC binaries.  (For example, running "/lib/ld-linux.so.2
      /bin/cat" might cause the subsequent load of /bin/cat into where the
      loader had been loaded.)
      
      With the advent of PIE (ET_DYN binaries with an INTERP Program Header),
      ELF_ET_DYN_BASE continued to be used since the kernel was only looking
      at ET_DYN.  However, since ELF_ET_DYN_BASE is traditionally set at the
      top 1/3rd of the TASK_SIZE, a substantial portion of the address space
      is unused.
      
      For 32-bit tasks when RLIMIT_STACK is set to RLIM_INFINITY, programs are
      loaded above the mmap region.  This means they can be made to collide
      (CVE-2017-1000370) or nearly collide (CVE-2017-1000371) with
      pathological stack regions.
      
      Lowering ELF_ET_DYN_BASE solves both by moving programs below the mmap
      region in all cases, and will now additionally avoid programs falling
      back to the mmap region by enforcing MAP_FIXED for program loads (i.e.
      if it would have collided with the stack, now it will fail to load
      instead of falling back to the mmap region).
      
      To allow for a lower ELF_ET_DYN_BASE, loaders (ET_DYN without INTERP)
      are loaded into the mmap region, leaving space available for either an
      ET_EXEC binary with a fixed location or PIE being loaded into mmap by
      the loader.  Only PIE programs are loaded offset from ELF_ET_DYN_BASE,
      which means architectures can now safely lower their values without risk
      of loaders colliding with their subsequently loaded programs.
      
      For 64-bit, ELF_ET_DYN_BASE is best set to 4GB to allow runtimes to use
      the entire 32-bit address space for 32-bit pointers.
      
      Thanks to PaX Team, Daniel Micay, and Rik van Riel for inspiration and
      suggestions on how to implement this solution.
      
      Fixes: d1fd836d ("mm: split ET_DYN ASLR from mmap ASLR")
      Link: http://lkml.kernel.org/r/20170621173201.GA114489@beastSigned-off-by: default avatarKees Cook <keescook@chromium.org>
      Acked-by: default avatarRik van Riel <riel@redhat.com>
      Cc: Daniel Micay <danielmicay@gmail.com>
      Cc: Qualys Security Advisory <qsa@qualys.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com>
      Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: James Hogan <james.hogan@imgtec.com>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Michael Ellerman <mpe@ellerman.id.au>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Pratyush Anand <panand@redhat.com>
      Cc: Russell King <linux@armlinux.org.uk>
      Cc: Will Deacon <will.deacon@arm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      63c2f8f8
    • Cyril Bur's avatar
      checkpatch: silence perl 5.26.0 unescaped left brace warnings · 93eae954
      Cyril Bur authored
      commit 8d81ae05 upstream.
      
      As of perl 5, version 26, subversion 0 (v5.26.0) some new warnings have
      occurred when running checkpatch.
      
      Unescaped left brace in regex is deprecated here (and will be fatal in
      Perl 5.30), passed through in regex; marked by <-- HERE in m/^(.\s*){
      <-- HERE \s*/ at scripts/checkpatch.pl line 3544.
      
      Unescaped left brace in regex is deprecated here (and will be fatal in
      Perl 5.30), passed through in regex; marked by <-- HERE in m/^(.\s*){
      <-- HERE \s*/ at scripts/checkpatch.pl line 3885.
      
      Unescaped left brace in regex is deprecated here (and will be fatal in
      Perl 5.30), passed through in regex; marked by <-- HERE in
      m/^(\+.*(?:do|\))){ <-- HERE / at scripts/checkpatch.pl line 4374.
      
      It seems perfectly reasonable to do as the warning suggests and simply
      escape the left brace in these three locations.
      
      Link: http://lkml.kernel.org/r/20170607060135.17384-1-cyrilbur@gmail.comSigned-off-by: default avatarCyril Bur <cyrilbur@gmail.com>
      Acked-by: default avatarJoe Perches <joe@perches.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      93eae954
    • Sahitya Tummala's avatar
      fs/dcache.c: fix spin lockup issue on nlru->lock · a9aa6522
      Sahitya Tummala authored
      commit b17c070f upstream.
      
      __list_lru_walk_one() acquires nlru spin lock (nlru->lock) for longer
      duration if there are more number of items in the lru list.  As per the
      current code, it can hold the spin lock for upto maximum UINT_MAX
      entries at a time.  So if there are more number of items in the lru
      list, then "BUG: spinlock lockup suspected" is observed in the below
      path:
      
        spin_bug+0x90
        do_raw_spin_lock+0xfc
        _raw_spin_lock+0x28
        list_lru_add+0x28
        dput+0x1c8
        path_put+0x20
        terminate_walk+0x3c
        path_lookupat+0x100
        filename_lookup+0x6c
        user_path_at_empty+0x54
        SyS_faccessat+0xd0
        el0_svc_naked+0x24
      
      This nlru->lock is acquired by another CPU in this path -
      
        d_lru_shrink_move+0x34
        dentry_lru_isolate_shrink+0x48
        __list_lru_walk_one.isra.10+0x94
        list_lru_walk_node+0x40
        shrink_dcache_sb+0x60
        do_remount_sb+0xbc
        do_emergency_remount+0xb0
        process_one_work+0x228
        worker_thread+0x2e0
        kthread+0xf4
        ret_from_fork+0x10
      
      Fix this lockup by reducing the number of entries to be shrinked from
      the lru list to 1024 at once.  Also, add cond_resched() before
      processing the lru list again.
      
      Link: http://marc.info/?t=149722864900001&r=1&w=2
      Link: http://lkml.kernel.org/r/1498707575-2472-1-git-send-email-stummala@codeaurora.orgSigned-off-by: default avatarSahitya Tummala <stummala@codeaurora.org>
      Suggested-by: default avatarJan Kara <jack@suse.cz>
      Suggested-by: default avatarVladimir Davydov <vdavydov.dev@gmail.com>
      Acked-by: default avatarVladimir Davydov <vdavydov.dev@gmail.com>
      Cc: Alexander Polakov <apolyakov@beget.ru>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      a9aa6522
    • Sahitya Tummala's avatar
      mm/list_lru.c: fix list_lru_count_node() to be race free · a48542e8
      Sahitya Tummala authored
      commit 2c80cd57 upstream.
      
      list_lru_count_node() iterates over all memcgs to get the total number of
      entries on the node but it can race with memcg_drain_all_list_lrus(),
      which migrates the entries from a dead cgroup to another.  This can return
      incorrect number of entries from list_lru_count_node().
      
      Fix this by keeping track of entries per node and simply return it in
      list_lru_count_node().
      
      Link: http://lkml.kernel.org/r/1498707555-30525-1-git-send-email-stummala@codeaurora.orgSigned-off-by: default avatarSahitya Tummala <stummala@codeaurora.org>
      Acked-by: default avatarVladimir Davydov <vdavydov.dev@gmail.com>
      Cc: Jan Kara <jack@suse.cz>
      Cc: Alexander Polakov <apolyakov@beget.ru>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      a48542e8
    • Marcin Nowakowski's avatar
      kernel/extable.c: mark core_kernel_text notrace · 8c6f19c2
      Marcin Nowakowski authored
      commit c0d80dda upstream.
      
      core_kernel_text is used by MIPS in its function graph trace processing,
      so having this method traced leads to an infinite set of recursive calls
      such as:
      
        Call Trace:
           ftrace_return_to_handler+0x50/0x128
           core_kernel_text+0x10/0x1b8
           prepare_ftrace_return+0x6c/0x114
           ftrace_graph_caller+0x20/0x44
           return_to_handler+0x10/0x30
           return_to_handler+0x0/0x30
           return_to_handler+0x0/0x30
           ftrace_ops_no_ops+0x114/0x1bc
           core_kernel_text+0x10/0x1b8
           core_kernel_text+0x10/0x1b8
           core_kernel_text+0x10/0x1b8
           ftrace_ops_no_ops+0x114/0x1bc
           core_kernel_text+0x10/0x1b8
           prepare_ftrace_return+0x6c/0x114
           ftrace_graph_caller+0x20/0x44
           (...)
      
      Mark the function notrace to avoid it being traced.
      
      Link: http://lkml.kernel.org/r/1498028607-6765-1-git-send-email-marcin.nowakowski@imgtec.comSigned-off-by: default avatarMarcin Nowakowski <marcin.nowakowski@imgtec.com>
      Reviewed-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Meyer <thomas@m3y3r.de>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Daniel Borkmann <daniel@iogearbox.net>
      Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      8c6f19c2
    • Kirill A. Shutemov's avatar
      thp, mm: fix crash due race in MADV_FREE handling · d2b64687
      Kirill A. Shutemov authored
      commit bbf29ffc upstream.
      
      Reinette reported the following crash:
      
        BUG: Bad page state in process log2exe  pfn:57600
        page:ffffea00015d8000 count:0 mapcount:0 mapping:          (null) index:0x20200
        flags: 0x4000000000040019(locked|uptodate|dirty|swapbacked)
        raw: 4000000000040019 0000000000000000 0000000000020200 00000000ffffffff
        raw: ffffea00015d8020 ffffea00015d8020 0000000000000000 0000000000000000
        page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set
        bad because of flags: 0x1(locked)
        Modules linked in: rfcomm 8021q bnep intel_rapl x86_pkg_temp_thermal coretemp efivars btusb btrtl btbcm pwm_lpss_pci snd_hda_codec_hdmi btintel pwm_lpss snd_hda_codec_realtek snd_soc_skl snd_hda_codec_generic snd_soc_skl_ipc spi_pxa2xx_platform snd_soc_sst_ipc snd_soc_sst_dsp i2c_designware_platform i2c_designware_core snd_hda_ext_core snd_soc_sst_match snd_hda_intel snd_hda_codec mei_me snd_hda_core mei snd_soc_rt286 snd_soc_rl6347a snd_soc_core efivarfs
        CPU: 1 PID: 354 Comm: log2exe Not tainted 4.12.0-rc7-test-test #19
        Hardware name: Intel corporation NUC6CAYS/NUC6CAYB, BIOS AYAPLCEL.86A.0027.2016.1108.1529 11/08/2016
        Call Trace:
         bad_page+0x16a/0x1f0
         free_pages_check_bad+0x117/0x190
         free_hot_cold_page+0x7b1/0xad0
         __put_page+0x70/0xa0
         madvise_free_huge_pmd+0x627/0x7b0
         madvise_free_pte_range+0x6f8/0x1150
         __walk_page_range+0x6b5/0xe30
         walk_page_range+0x13b/0x310
         madvise_free_page_range.isra.16+0xad/0xd0
         madvise_free_single_vma+0x2e4/0x470
         SyS_madvise+0x8ce/0x1450
      
      If somebody frees the page under us and we hold the last reference to
      it, put_page() would attempt to free the page before unlocking it.
      
      The fix is trivial reorder of operations.
      
      Dave said:
       "I came up with the exact same patch.  For posterity, here's the test
        case, generated by syzkaller and trimmed down by Reinette:
      
        	https://www.sr71.net/~dave/intel/log2.c
      
        And the config that helps detect this:
      
        	https://www.sr71.net/~dave/intel/config-log2"
      
      Fixes: b8d3c4c3 ("mm/huge_memory.c: don't split THP page when MADV_FREE syscall is called")
      Link: http://lkml.kernel.org/r/20170628101249.17879-1-kirill.shutemov@linux.intel.comSigned-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Reported-by: default avatarReinette Chatre <reinette.chatre@intel.com>
      Acked-by: default avatarDave Hansen <dave.hansen@intel.com>
      Acked-by: default avatarMichal Hocko <mhocko@suse.com>
      Acked-by: default avatarMinchan Kim <minchan@kernel.org>
      Cc: Huang Ying <ying.huang@intel.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      d2b64687
    • Ben Hutchings's avatar
      tools/lib/lockdep: Reduce MAX_LOCK_DEPTH to avoid overflowing lock_chain/: Depth · 68ea25f0
      Ben Hutchings authored
      commit 98dcea0c upstream.
      
      liblockdep has been broken since commit 75dd602a ("lockdep: Fix
      lock_chain::base size"), as that adds a check that MAX_LOCK_DEPTH is
      within the range of lock_chain::depth and in liblockdep it is much
      too large.
      
      That should have resulted in a compiler error, but didn't because:
      
      - the check uses ARRAY_SIZE(), which isn't yet defined in liblockdep
        so is assumed to be an (undeclared) function
      - putting a function call inside a BUILD_BUG_ON() expression quietly
        turns it into some nonsense involving a variable-length array
      
      It did produce a compiler warning, but I didn't notice because
      liblockdep already produces too many warnings if -Wall is enabled
      (which I'll fix shortly).
      
      Even before that commit, which reduced lock_chain::depth from 8 bits
      to 6, MAX_LOCK_DEPTH was too large.
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: a.p.zijlstra@chello.nl
      Link: http://lkml.kernel.org/r/20170525130005.5947-3-alexander.levin@verizon.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      68ea25f0
    • Helge Deller's avatar
      parisc/mm: Ensure IRQs are off in switch_mm() · e3d2adaa
      Helge Deller authored
      commit 649aa242 upstream.
      
      This is because of commit f98db601 ("sched/core: Add switch_mm_irqs_off()
      and use it in the scheduler") in which switch_mm_irqs_off() is called by the
      scheduler, vs switch_mm() which is used by use_mm().
      
      This patch lets the parisc code mirror the x86 and powerpc code, ie. it
      disables interrupts in switch_mm(), and optimises the scheduler case by
      defining switch_mm_irqs_off().
      Signed-off-by: default avatarHelge Deller <deller@gmx.de>
      Signed-off-by: default avatarHelge Deller <deller@gmx.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      e3d2adaa
    • Thomas Bogendoerfer's avatar
      parisc: DMA API: return error instead of BUG_ON for dma ops on non dma devs · 8ed89cfc
      Thomas Bogendoerfer authored
      commit 33f9e024 upstream.
      
      Enabling parport pc driver on a B2600 (and probably other 64bit PARISC
      systems) produced following BUG:
      
      CPU: 0 PID: 1 Comm: swapper Not tainted 4.12.0-rc5-30198-g1132d5e7 #156
      task: 000000009e050000 task.stack: 000000009e04c000
      
           YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI
      PSW: 00001000000001101111111100001111 Not tainted
      r00-03  000000ff0806ff0f 000000009e04c990 0000000040871b78 000000009e04cac0
      r04-07  0000000040c14de0 ffffffffffffffff 000000009e07f098 000000009d82d200
      r08-11  000000009d82d210 0000000000000378 0000000000000000 0000000040c345e0
      r12-15  0000000000000005 0000000040c345e0 0000000000000000 0000000040c9d5e0
      r16-19  0000000040c345e0 00000000f00001c4 00000000f00001bc 0000000000000061
      r20-23  000000009e04ce28 0000000000000010 0000000000000010 0000000040b89e40
      r24-27  0000000000000003 0000000000ffffff 000000009d82d210 0000000040c14de0
      r28-31  0000000000000000 000000009e04ca90 000000009e04cb40 0000000000000000
      sr00-03  0000000000000000 0000000000000000 0000000000000000 0000000000000000
      sr04-07  0000000000000000 0000000000000000 0000000000000000 0000000000000000
      
      IASQ: 0000000000000000 0000000000000000 IAOQ: 00000000404aece0 00000000404aece4
       IIR: 03ffe01f    ISR: 0000000010340000  IOR: 000001781304cac8
       CPU:        0   CR30: 000000009e04c000 CR31: 00000000e2976de2
       ORIG_R28: 0000000000000200
       IAOQ[0]: sba_dma_supported+0x80/0xd0
       IAOQ[1]: sba_dma_supported+0x84/0xd0
       RP(r2): parport_pc_probe_port+0x178/0x1200
      
      Cause is a call to dma_coerce_mask_and_coherenet in parport_pc_probe_port,
      which PARISC DMA API doesn't handle very nicely. This commit gives back
      DMA_ERROR_CODE for DMA API calls, if device isn't capable of DMA
      transaction.
      Signed-off-by: default avatarThomas Bogendoerfer <tsbogend@alpha.franken.de>
      Signed-off-by: default avatarHelge Deller <deller@gmx.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      8ed89cfc
    • Eric Biggers's avatar
      parisc: use compat_sys_keyctl() · bf1e4dc3
      Eric Biggers authored
      commit b0f94efd upstream.
      
      Architectures with a compat syscall table must put compat_sys_keyctl()
      in it, not sys_keyctl().  The parisc architecture was not doing this;
      fix it.
      Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
      Acked-by: default avatarHelge Deller <deller@gmx.de>
      Signed-off-by: default avatarHelge Deller <deller@gmx.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      bf1e4dc3
    • Helge Deller's avatar
      parisc: Report SIGSEGV instead of SIGBUS when running out of stack · 008a1f27
      Helge Deller authored
      commit 24746231 upstream.
      
      When a process runs out of stack the parisc kernel wrongly faults with SIGBUS
      instead of the expected SIGSEGV signal.
      
      This example shows how the kernel faults:
      do_page_fault() command='a.out' type=15 address=0xfaac2000 in libc-2.24.so[f8308000+16c000]
      trap #15: Data TLB miss fault, vm_start = 0xfa2c2000, vm_end = 0xfaac2000
      
      The vma->vm_end value is the first address which does not belong to the vma, so
      adjust the check to include vma->vm_end to the range for which to send the
      SIGSEGV signal.
      
      This patch unbreaks building the debian libsigsegv package.
      Signed-off-by: default avatarHelge Deller <deller@gmx.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      008a1f27
    • Suzuki K Poulose's avatar
      irqchip/gic-v3: Fix out-of-bound access in gic_set_affinity · 59613f80
      Suzuki K Poulose authored
      commit 866d7c1b upstream.
      
      The GICv3 driver doesn't check if the target CPU for gic_set_affinity
      is valid before going ahead and making the changes. This triggers the
      following splat with KASAN:
      
      [  141.189434] BUG: KASAN: global-out-of-bounds in gic_set_affinity+0x8c/0x140
      [  141.189704] Read of size 8 at addr ffff200009741d20 by task swapper/1/0
      [  141.189958]
      [  141.190158] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.12.0-rc7
      [  141.190458] Hardware name: Foundation-v8A (DT)
      [  141.190658] Call trace:
      [  141.190908] [<ffff200008089d70>] dump_backtrace+0x0/0x328
      [  141.191224] [<ffff20000808a1b4>] show_stack+0x14/0x20
      [  141.191507] [<ffff200008504c3c>] dump_stack+0xa4/0xc8
      [  141.191858] [<ffff20000826c19c>] print_address_description+0x13c/0x250
      [  141.192219] [<ffff20000826c5c8>] kasan_report+0x210/0x300
      [  141.192547] [<ffff20000826ad54>] __asan_load8+0x84/0x98
      [  141.192874] [<ffff20000854eeec>] gic_set_affinity+0x8c/0x140
      [  141.193158] [<ffff200008148b14>] irq_do_set_affinity+0x54/0xb8
      [  141.193473] [<ffff200008148d2c>] irq_set_affinity_locked+0x64/0xf0
      [  141.193828] [<ffff200008148e00>] __irq_set_affinity+0x48/0x78
      [  141.194158] [<ffff200008bc48a4>] arm_perf_starting_cpu+0x104/0x150
      [  141.194513] [<ffff2000080d73bc>] cpuhp_invoke_callback+0x17c/0x1f8
      [  141.194783] [<ffff2000080d94ec>] notify_cpu_starting+0x8c/0xb8
      [  141.195130] [<ffff2000080911ec>] secondary_start_kernel+0x15c/0x200
      [  141.195390] [<0000000080db81b4>] 0x80db81b4
      [  141.195603]
      [  141.195685] The buggy address belongs to the variable:
      [  141.196012]  __cpu_logical_map+0x200/0x220
      [  141.196176]
      [  141.196315] Memory state around the buggy address:
      [  141.196586]  ffff200009741c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
      [  141.196913]  ffff200009741c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
      [  141.197158] >ffff200009741d00: 00 00 00 00 fa fa fa fa 00 00 00 00 00 00 00 00
      [  141.197487]                                ^
      [  141.197758]  ffff200009741d80: 00 00 00 00 00 00 00 00 fa fa fa fa 00 00 00 00
      [  141.198060]  ffff200009741e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
      [  141.198358] ==================================================================
      [  141.198609] Disabling lock debugging due to kernel taint
      [  141.198961] CPU1: Booted secondary processor [410fd051]
      
      This patch adds the check to make sure the cpu is valid.
      
      Fixes: commit 021f6537 ("irqchip: gic-v3: Initial support for GICv3")
      Signed-off-by: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
      Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      59613f80
    • Srinivas Dasari's avatar
      cfg80211: Check if NAN service ID is of expected size · 6a90f81a
      Srinivas Dasari authored
      commit 0a27844c upstream.
      
      nla policy checks for only maximum length of the attribute data when the
      attribute type is NLA_BINARY. If userspace sends less data than
      specified, cfg80211 may access illegal memory. When type is NLA_UNSPEC,
      nla policy check ensures that userspace sends minimum specified length
      number of bytes.
      
      Remove type assignment to NLA_BINARY from nla_policy of
      NL80211_NAN_FUNC_SERVICE_ID to make these NLA_UNSPEC and to make sure
      minimum NL80211_NAN_FUNC_SERVICE_ID_LEN bytes are received from
      userspace with NL80211_NAN_FUNC_SERVICE_ID.
      
      Fixes: a442b761 ("cfg80211: add add_nan_func / del_nan_func")
      Signed-off-by: default avatarSrinivas Dasari <dasaris@qti.qualcomm.com>
      Signed-off-by: default avatarJouni Malinen <jouni@qca.qualcomm.com>
      Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      6a90f81a
    • Srinivas Dasari's avatar
      cfg80211: Check if PMKID attribute is of expected size · 7e9e9638
      Srinivas Dasari authored
      commit 9361df14 upstream.
      
      nla policy checks for only maximum length of the attribute data
      when the attribute type is NLA_BINARY. If userspace sends less
      data than specified, the wireless drivers may access illegal
      memory. When type is NLA_UNSPEC, nla policy check ensures that
      userspace sends minimum specified length number of bytes.
      
      Remove type assignment to NLA_BINARY from nla_policy of
      NL80211_ATTR_PMKID to make this NLA_UNSPEC and to make sure minimum
      WLAN_PMKID_LEN bytes are received from userspace with
      NL80211_ATTR_PMKID.
      
      Fixes: 67fbb16b ("nl80211: PMKSA caching support")
      Signed-off-by: default avatarSrinivas Dasari <dasaris@qti.qualcomm.com>
      Signed-off-by: default avatarJouni Malinen <jouni@qca.qualcomm.com>
      Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      7e9e9638
    • Srinivas Dasari's avatar
      cfg80211: Validate frequencies nested in NL80211_ATTR_SCAN_FREQUENCIES · e4712906
      Srinivas Dasari authored
      commit d7f13f74 upstream.
      
      validate_scan_freqs() retrieves frequencies from attributes
      nested in the attribute NL80211_ATTR_SCAN_FREQUENCIES with
      nla_get_u32(), which reads 4 bytes from each attribute
      without validating the size of data received. Attributes
      nested in NL80211_ATTR_SCAN_FREQUENCIES don't have an nla policy.
      
      Validate size of each attribute before parsing to avoid potential buffer
      overread.
      
      Fixes: 2a519311 ("cfg80211/nl80211: scanning (and mac80211 update to use it)")
      Signed-off-by: default avatarSrinivas Dasari <dasaris@qti.qualcomm.com>
      Signed-off-by: default avatarJouni Malinen <jouni@qca.qualcomm.com>
      Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      e4712906
    • Srinivas Dasari's avatar
      cfg80211: Define nla_policy for NL80211_ATTR_LOCAL_MESH_POWER_MODE · b68aa7df
      Srinivas Dasari authored
      commit 8feb69c7 upstream.
      
      Buffer overread may happen as nl80211_set_station() reads 4 bytes
      from the attribute NL80211_ATTR_LOCAL_MESH_POWER_MODE without
      validating the size of data received when userspace sends less
      than 4 bytes of data with NL80211_ATTR_LOCAL_MESH_POWER_MODE.
      Define nla_policy for NL80211_ATTR_LOCAL_MESH_POWER_MODE to avoid
      the buffer overread.
      
      Fixes: 3b1c5a53 ("{cfg,nl}80211: mesh power mode primitives and userspace access")
      Signed-off-by: default avatarSrinivas Dasari <dasaris@qti.qualcomm.com>
      Signed-off-by: default avatarJouni Malinen <jouni@qca.qualcomm.com>
      Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      b68aa7df
    • Bert Kenward's avatar
      sfc: don't read beyond unicast address list · 6ae9dd28
      Bert Kenward authored
      
      [ Upstream commit c70d6815 ]
      
      If we have more than 32 unicast MAC addresses assigned to an interface
      we will read beyond the end of the address table in the driver when
      adding filters. The next 256 entries store multicast addresses, so we
      will end up attempting to insert duplicate filters, which is mostly
      harmless. If we add more than 288 unicast addresses we will then read
      past the multicast address table, which is likely to be more exciting.
      
      Fixes: 12fb0da4 ("sfc: clean fallbacks between promisc/normal in efx_ef10_filter_sync_rx_mode")
      Signed-off-by: default avatarBert Kenward <bkenward@solarflare.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      6ae9dd28
    • Peter S. Housel's avatar
      brcmfmac: Fix glom_skb leak in brcmf_sdiod_recv_chain · 5f69bb1d
      Peter S. Housel authored
      commit 5ea59db8 upstream.
      
      An earlier change to this function (3bdae810) fixed a leak in the
      case of an unsuccessful call to brcmf_sdiod_buffrw(). However, the
      glom_skb buffer, used for emulating a scattering read, is never used
      or referenced after its contents are copied into the destination
      buffers, and therefore always needs to be freed by the end of the
      function.
      
      Fixes: 3bdae810 ("brcmfmac: Fix glob_skb leak in brcmf_sdiod_recv_chain")
      Fixes: a413e39a ("brcmfmac: fix brcmf_sdcard_recv_chain() for host without sg support")
      Signed-off-by: default avatarPeter S. Housel <housel@acm.org>
      Signed-off-by: default avatarArend van Spriel <arend.vanspriel@broadcom.com>
      Signed-off-by: default avatarKalle Valo <kvalo@codeaurora.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      5f69bb1d
    • Christophe Jaillet's avatar
      brcmfmac: Fix a memory leak in error handling path in 'brcmf_cfg80211_attach' · fd325ddd
      Christophe Jaillet authored
      commit 57c00f2f upstream.
      
      If 'wiphy_new()' fails, we leak 'ops'. Add a new label in the error
      handling path to free it in such a case.
      
      Fixes: 5c22fb85 ("brcmfmac: add wowl gtk rekeying offload support")
      Signed-off-by: default avatarChristophe JAILLET <christophe.jaillet@wanadoo.fr>
      Signed-off-by: default avatarKalle Valo <kvalo@codeaurora.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      fd325ddd
    • Arend van Spriel's avatar
      brcmfmac: fix possible buffer overflow in brcmf_cfg80211_mgmt_tx() · 414848bb
      Arend van Spriel authored
      commit 8f44c9a4 upstream.
      
      The lower level nl80211 code in cfg80211 ensures that "len" is between
      25 and NL80211_ATTR_FRAME (2304).  We subtract DOT11_MGMT_HDR_LEN (24) from
      "len" so thats's max of 2280.  However, the action_frame->data[] buffer is
      only BRCMF_FIL_ACTION_FRAME_SIZE (1800) bytes long so this memcpy() can
      overflow.
      
      	memcpy(action_frame->data, &buf[DOT11_MGMT_HDR_LEN],
      	       le16_to_cpu(action_frame->len));
      
      Fixes: 18e2f61d ("brcmfmac: P2P action frame tx.")
      Reported-by: default avatar"freenerguo(郭大兴)" <freenerguo@tencent.com>
      Signed-off-by: default avatarArend van Spriel <arend.vanspriel@broadcom.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      414848bb
    • Sowmini Varadhan's avatar
      rds: tcp: use sock_create_lite() to create the accept socket · 181dda46
      Sowmini Varadhan authored
      commit 0933a578 upstream.
      
      There are two problems with calling sock_create_kern() from
      rds_tcp_accept_one()
      1. it sets up a new_sock->sk that is wasteful, because this ->sk
         is going to get replaced by inet_accept() in the subsequent ->accept()
      2. The new_sock->sk is a leaked reference in sock_graft() which
         expects to find a null parent->sk
      
      Avoid these problems by calling sock_create_lite().
      Signed-off-by: default avatarSowmini Varadhan <sowmini.varadhan@oracle.com>
      Acked-by: default avatarSantosh Shilimkar <santosh.shilimkar@oracle.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      181dda46
    • Nikolay Aleksandrov's avatar
      vrf: fix bug_on triggered by rx when destroying a vrf · e6577f1e
      Nikolay Aleksandrov authored
      commit f630c38e upstream.
      
      When destroying a VRF device we cleanup the slaves in its ndo_uninit()
      function, but that causes packets to be switched (skb->dev == vrf being
      destroyed) even though we're pass the point where the VRF should be
      receiving any packets while it is being dismantled. This causes a BUG_ON
      to trigger if we have raw sockets (trace below).
      The reason is that the inetdev of the VRF has been destroyed but we're
      still sending packets up the stack with it, so let's free the slaves in
      the dellink callback as David Ahern suggested.
      
      Note that this fix doesn't prevent packets from going up when the VRF
      device is admin down.
      
      [   35.631371] ------------[ cut here ]------------
      [   35.631603] kernel BUG at net/ipv4/fib_frontend.c:285!
      [   35.631854] invalid opcode: 0000 [#1] SMP
      [   35.631977] Modules linked in:
      [   35.632081] CPU: 2 PID: 22 Comm: ksoftirqd/2 Not tainted 4.12.0-rc7+ #45
      [   35.632247] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
      [   35.632477] task: ffff88005ad68000 task.stack: ffff88005ad64000
      [   35.632632] RIP: 0010:fib_compute_spec_dst+0xfc/0x1ee
      [   35.632769] RSP: 0018:ffff88005ad67978 EFLAGS: 00010202
      [   35.632910] RAX: 0000000000000001 RBX: ffff880059a7f200 RCX: 0000000000000000
      [   35.633084] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff82274af0
      [   35.633256] RBP: ffff88005ad679f8 R08: 000000000001ef70 R09: 0000000000000046
      [   35.633430] R10: ffff88005ad679f8 R11: ffff880037731cb0 R12: 0000000000000001
      [   35.633603] R13: ffff8800599e3000 R14: 0000000000000000 R15: ffff8800599cb852
      [   35.634114] FS:  0000000000000000(0000) GS:ffff88005d900000(0000) knlGS:0000000000000000
      [   35.634306] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [   35.634456] CR2: 00007f3563227095 CR3: 000000000201d000 CR4: 00000000000406e0
      [   35.634632] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [   35.634865] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [   35.635055] Call Trace:
      [   35.635271]  ? __lock_acquire+0xf0d/0x1117
      [   35.635522]  ipv4_pktinfo_prepare+0x82/0x151
      [   35.635831]  raw_rcv_skb+0x17/0x3c
      [   35.636062]  raw_rcv+0xe5/0xf7
      [   35.636287]  raw_local_deliver+0x169/0x1d9
      [   35.636534]  ip_local_deliver_finish+0x87/0x1c4
      [   35.636820]  ip_local_deliver+0x63/0x7f
      [   35.637058]  ip_rcv_finish+0x340/0x3a1
      [   35.637295]  ip_rcv+0x314/0x34a
      [   35.637525]  __netif_receive_skb_core+0x49f/0x7c5
      [   35.637780]  ? lock_acquire+0x13f/0x1d7
      [   35.638018]  ? lock_acquire+0x15e/0x1d7
      [   35.638259]  __netif_receive_skb+0x1e/0x94
      [   35.638502]  ? __netif_receive_skb+0x1e/0x94
      [   35.638748]  netif_receive_skb_internal+0x74/0x300
      [   35.639002]  ? dev_gro_receive+0x2ed/0x411
      [   35.639246]  ? lock_is_held_type+0xc4/0xd2
      [   35.639491]  napi_gro_receive+0x105/0x1a0
      [   35.639736]  receive_buf+0xc32/0xc74
      [   35.639965]  ? detach_buf+0x67/0x153
      [   35.640201]  ? virtqueue_get_buf_ctx+0x120/0x176
      [   35.640453]  virtnet_poll+0x128/0x1c5
      [   35.640690]  net_rx_action+0x103/0x343
      [   35.640932]  __do_softirq+0x1c7/0x4b7
      [   35.641171]  run_ksoftirqd+0x23/0x5c
      [   35.641403]  smpboot_thread_fn+0x24f/0x26d
      [   35.641646]  ? sort_range+0x22/0x22
      [   35.641878]  kthread+0x129/0x131
      [   35.642104]  ? __list_add+0x31/0x31
      [   35.642335]  ? __list_add+0x31/0x31
      [   35.642568]  ret_from_fork+0x2a/0x40
      [   35.642804] Code: 05 bd 87 a3 00 01 e8 1f ef 98 ff 4d 85 f6 48 c7 c7 f0 4a 27 82 41 0f 94 c4 31 c9 31 d2 41 0f b6 f4 e8 04 71 a1 ff 45 84 e4 74 02 <0f> 0b 0f b7 93 c4 00 00 00 4d 8b a5 80 05 00 00 48 03 93 d0 00
      [   35.644342] RIP: fib_compute_spec_dst+0xfc/0x1ee RSP: ffff88005ad67978
      
      Fixes: 193125db ("net: Introduce VRF device driver")
      Reported-by: default avatarChris Cormier <chriscormier@cumulusnetworks.com>
      Signed-off-by: default avatarNikolay Aleksandrov <nikolay@cumulusnetworks.com>
      Acked-by: default avatarDavid Ahern <dsahern@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      e6577f1e
    • David Ahern's avatar
      net: ipv6: Compare lwstate in detecting duplicate nexthops · 0bc26d1c
      David Ahern authored
      commit f06b7549 upstream.
      
      Lennert reported a failure to add different mpls encaps in a multipath
      route:
      
        $ ip -6 route add 1234::/16 \
              nexthop encap mpls 10 via fe80::1 dev ens3 \
              nexthop encap mpls 20 via fe80::1 dev ens3
        RTNETLINK answers: File exists
      
      The problem is that the duplicate nexthop detection does not compare
      lwtunnel configuration. Add it.
      
      Fixes: 19e42e45 ("ipv6: support for fib route lwtunnel encap attributes")
      Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
      Reported-by: default avatarJoão Taveira Araújo <joao.taveira@gmail.com>
      Reported-by: default avatarLennert Buytenhek <buytenh@wantstofly.org>
      Acked-by: default avatarRoopa Prabhu <roopa@cumulusnetworks.com>
      Tested-by: default avatarLennert Buytenhek <buytenh@wantstofly.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      0bc26d1c
    • Alban Browaeys's avatar
      net: core: Fix slab-out-of-bounds in netdev_stats_to_stats64 · 05e165e9
      Alban Browaeys authored
      commit 9af9959e upstream.
      
      commit 9256645a ("net/core: relax BUILD_BUG_ON in
      netdev_stats_to_stats64") made an attempt to read beyond
      the size of the source a possibility.
      
      Fix to only copy src size to dest. As dest might be bigger than src.
      
       ==================================================================
       BUG: KASAN: slab-out-of-bounds in netdev_stats_to_stats64+0xe/0x30 at addr ffff8801be248b20
       Read of size 192 by task VBoxNetAdpCtl/6734
       CPU: 1 PID: 6734 Comm: VBoxNetAdpCtl Tainted: G           O    4.11.4prahal+intel+ #118
       Hardware name: LENOVO 20CDCTO1WW/20CDCTO1WW, BIOS GQET52WW (1.32 ) 05/04/2017
       Call Trace:
        dump_stack+0x63/0x86
        kasan_object_err+0x1c/0x70
        kasan_report+0x270/0x520
        ? netdev_stats_to_stats64+0xe/0x30
        ? sched_clock_cpu+0x1b/0x190
        ? __module_address+0x3e/0x3b0
        ? unwind_next_frame+0x1ea/0xb00
        check_memory_region+0x13c/0x1a0
        memcpy+0x23/0x50
        netdev_stats_to_stats64+0xe/0x30
        dev_get_stats+0x1b9/0x230
        rtnl_fill_stats+0x44/0xc00
        ? nla_put+0xc6/0x130
        rtnl_fill_ifinfo+0xe9e/0x3700
        ? rtnl_fill_vfinfo+0xde0/0xde0
        ? sched_clock+0x9/0x10
        ? sched_clock+0x9/0x10
        ? sched_clock_local+0x120/0x130
        ? __module_address+0x3e/0x3b0
        ? unwind_next_frame+0x1ea/0xb00
        ? sched_clock+0x9/0x10
        ? sched_clock+0x9/0x10
        ? sched_clock_cpu+0x1b/0x190
        ? VBoxNetAdpLinuxIOCtlUnlocked+0x14b/0x280 [vboxnetadp]
        ? depot_save_stack+0x1d8/0x4a0
        ? depot_save_stack+0x34f/0x4a0
        ? depot_save_stack+0x34f/0x4a0
        ? save_stack+0xb1/0xd0
        ? save_stack_trace+0x16/0x20
        ? save_stack+0x46/0xd0
        ? kasan_slab_alloc+0x12/0x20
        ? __kmalloc_node_track_caller+0x10d/0x350
        ? __kmalloc_reserve.isra.36+0x2c/0xc0
        ? __alloc_skb+0xd0/0x560
        ? rtmsg_ifinfo_build_skb+0x61/0x120
        ? rtmsg_ifinfo.part.25+0x16/0xb0
        ? rtmsg_ifinfo+0x47/0x70
        ? register_netdev+0x15/0x30
        ? vboxNetAdpOsCreate+0xc0/0x1c0 [vboxnetadp]
        ? vboxNetAdpCreate+0x210/0x400 [vboxnetadp]
        ? VBoxNetAdpLinuxIOCtlUnlocked+0x14b/0x280 [vboxnetadp]
        ? do_vfs_ioctl+0x17f/0xff0
        ? SyS_ioctl+0x74/0x80
        ? do_syscall_64+0x182/0x390
        ? __alloc_skb+0xd0/0x560
        ? __alloc_skb+0xd0/0x560
        ? save_stack_trace+0x16/0x20
        ? init_object+0x64/0xa0
        ? ___slab_alloc+0x1ae/0x5c0
        ? ___slab_alloc+0x1ae/0x5c0
        ? __alloc_skb+0xd0/0x560
        ? sched_clock+0x9/0x10
        ? kasan_unpoison_shadow+0x35/0x50
        ? kasan_kmalloc+0xad/0xe0
        ? __kmalloc_node_track_caller+0x246/0x350
        ? __alloc_skb+0xd0/0x560
        ? kasan_unpoison_shadow+0x35/0x50
        ? memset+0x31/0x40
        ? __alloc_skb+0x31f/0x560
        ? napi_consume_skb+0x320/0x320
        ? br_get_link_af_size_filtered+0xb7/0x120 [bridge]
        ? if_nlmsg_size+0x440/0x630
        rtmsg_ifinfo_build_skb+0x83/0x120
        rtmsg_ifinfo.part.25+0x16/0xb0
        rtmsg_ifinfo+0x47/0x70
        register_netdevice+0xa2b/0xe50
        ? __kmalloc+0x171/0x2d0
        ? netdev_change_features+0x80/0x80
        register_netdev+0x15/0x30
        vboxNetAdpOsCreate+0xc0/0x1c0 [vboxnetadp]
        vboxNetAdpCreate+0x210/0x400 [vboxnetadp]
        ? vboxNetAdpComposeMACAddress+0x1d0/0x1d0 [vboxnetadp]
        ? kasan_check_write+0x14/0x20
        VBoxNetAdpLinuxIOCtlUnlocked+0x14b/0x280 [vboxnetadp]
        ? VBoxNetAdpLinuxOpen+0x20/0x20 [vboxnetadp]
        ? lock_acquire+0x11c/0x270
        ? __audit_syscall_entry+0x2fb/0x660
        do_vfs_ioctl+0x17f/0xff0
        ? __audit_syscall_entry+0x2fb/0x660
        ? ioctl_preallocate+0x1d0/0x1d0
        ? __audit_syscall_entry+0x2fb/0x660
        ? kmem_cache_free+0xb2/0x250
        ? syscall_trace_enter+0x537/0xd00
        ? exit_to_usermode_loop+0x100/0x100
        SyS_ioctl+0x74/0x80
        ? do_sys_open+0x350/0x350
        ? do_vfs_ioctl+0xff0/0xff0
        do_syscall_64+0x182/0x390
        entry_SYSCALL64_slow_path+0x25/0x25
       RIP: 0033:0x7f7e39a1ae07
       RSP: 002b:00007ffc6f04c6d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
       RAX: ffffffffffffffda RBX: 00007ffc6f04c730 RCX: 00007f7e39a1ae07
       RDX: 00007ffc6f04c730 RSI: 00000000c0207601 RDI: 0000000000000007
       RBP: 00007ffc6f04c700 R08: 00007ffc6f04c780 R09: 0000000000000008
       R10: 0000000000000541 R11: 0000000000000206 R12: 0000000000000007
       R13: 00000000c0207601 R14: 00007ffc6f04c730 R15: 0000000000000012
       Object at ffff8801be248008, in cache kmalloc-4096 size: 4096
       Allocated:
       PID = 6734
        save_stack_trace+0x16/0x20
        save_stack+0x46/0xd0
        kasan_kmalloc+0xad/0xe0
        __kmalloc+0x171/0x2d0
        alloc_netdev_mqs+0x8a7/0xbe0
        vboxNetAdpOsCreate+0x65/0x1c0 [vboxnetadp]
        vboxNetAdpCreate+0x210/0x400 [vboxnetadp]
        VBoxNetAdpLinuxIOCtlUnlocked+0x14b/0x280 [vboxnetadp]
        do_vfs_ioctl+0x17f/0xff0
        SyS_ioctl+0x74/0x80
        do_syscall_64+0x182/0x390
        return_from_SYSCALL_64+0x0/0x6a
       Freed:
       PID = 5600
        save_stack_trace+0x16/0x20
        save_stack+0x46/0xd0
        kasan_slab_free+0x73/0xc0
        kfree+0xe4/0x220
        kvfree+0x25/0x30
        single_release+0x74/0xb0
        __fput+0x265/0x6b0
        ____fput+0x9/0x10
        task_work_run+0xd5/0x150
        exit_to_usermode_loop+0xe2/0x100
        do_syscall_64+0x26c/0x390
        return_from_SYSCALL_64+0x0/0x6a
       Memory state around the buggy address:
        ffff8801be248a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        ffff8801be248b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
       >ffff8801be248b80: 00 00 00 00 00 00 00 00 00 00 00 07 fc fc fc fc
                                                           ^
        ffff8801be248c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
        ffff8801be248c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
       ==================================================================
      Signed-off-by: default avatarAlban Browaeys <alban.browaeys@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      05e165e9
    • Jiri Benc's avatar
      vxlan: fix hlist corruption · beabc603
      Jiri Benc authored
      
      [ Upstream commit 69e76661 ]
      
      It's not a good idea to add the same hlist_node to two different hash lists.
      This leads to various hard to debug memory corruptions.
      
      Fixes: b1be00a6 ("vxlan: support both IPv4 and IPv6 sockets in a single vxlan device")
      Signed-off-by: default avatarJiri Benc <jbenc@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      beabc603
    • Sabrina Dubroca's avatar
      ipv6: dad: don't remove dynamic addresses if link is down · d2c95120
      Sabrina Dubroca authored
      commit ec8add2a upstream.
      
      Currently, when the link for $DEV is down, this command succeeds but the
      address is removed immediately by DAD (1):
      
          ip addr add 1111::12/64 dev $DEV valid_lft 3600 preferred_lft 1800
      
      In the same situation, this will succeed and not remove the address (2):
      
          ip addr add 1111::12/64 dev $DEV
          ip addr change 1111::12/64 dev $DEV valid_lft 3600 preferred_lft 1800
      
      The comment in addrconf_dad_begin() when !IF_READY makes it look like
      this is the intended behavior, but doesn't explain why:
      
           * If the device is not ready:
           * - keep it tentative if it is a permanent address.
           * - otherwise, kill it.
      
      We clearly cannot prevent userspace from doing (2), but we can make (1)
      work consistently with (2).
      
      addrconf_dad_stop() is only called in two cases: if DAD failed, or to
      skip DAD when the link is down. In that second case, the fix is to avoid
      deleting the address, like we already do for permanent addresses.
      
      Fixes: 3c21edbd ("[IPV6]: Defer IPv6 device initialization until the link becomes ready.")
      Signed-off-by: default avatarSabrina Dubroca <sd@queasysnail.net>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      d2c95120
    • Gal Pressman's avatar
      net/mlx5e: Fix TX carrier errors report in get stats ndo · 74356430
      Gal Pressman authored
      commit 8ff93de7 upstream.
      
      Symbol error during carrier counter from PPCNT was mistakenly reported as
      TX carrier errors in get_stats ndo, although it's an RX counter.
      
      Fixes: 269e6b3a ("net/mlx5e: Report additional error statistics in get stats ndo")
      Signed-off-by: default avatarGal Pressman <galp@mellanox.com>
      Signed-off-by: default avatarSaeed Mahameed <saeedm@mellanox.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      74356430
    • Derek Chickles's avatar
      liquidio: fix bug in soft reset failure detection · a80a70a4
      Derek Chickles authored
      commit 05a6b4ca upstream.
      
      The code that detects a failed soft reset of Octeon is comparing the wrong
      value against the reset value of the Octeon SLI_SCRATCH_1 register,
      resulting in an inability to detect a soft reset failure.  Fix it by using
      the correct value in the comparison, which is any non-zero value.
      
      Fixes: f21fb3ed ("Add support of Cavium Liquidio ethernet adapters")
      Fixes: c0eab5b3 ("liquidio: CN23XX firmware download")
      Signed-off-by: default avatarDerek Chickles <derek.chickles@cavium.com>
      Signed-off-by: default avatarSatanand Burla <satananda.burla@cavium.com>
      Signed-off-by: default avatarRaghu Vatsavayi <raghu.vatsavayi@cavium.com>
      Signed-off-by: default avatarFelix Manlunas <felix.manlunas@cavium.com>
      Reviewed-by: default avatarLeon Romanovsky <leonro@mellanox.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      a80a70a4
    • Mohamad Haj Yahia's avatar
      net/mlx5: Cancel delayed recovery work when unloading the driver · e20204dc
      Mohamad Haj Yahia authored
      commit 2a0165a0 upstream.
      
      Draining the health workqueue will ignore future health works including
      the one that report hardware failure and thus we can't enter error state
      Instead cancel the recovery flow and make sure only recovery flow won't
      be scheduled.
      
      Fixes: 5e44fca5 ('net/mlx5: Only cancel recovery work when cleaning up device')
      Signed-off-by: default avatarMohamad Haj Yahia <mohamad@mellanox.com>
      Signed-off-by: default avatarMoshe Shemesh <moshe@mellanox.com>
      Signed-off-by: default avatarSaeed Mahameed <saeedm@mellanox.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      e20204dc
    • Michal Kubeček's avatar
      net: handle NAPI_GRO_FREE_STOLEN_HEAD case also in napi_frags_finish() · 06732807
      Michal Kubeček authored
      commit e44699d2 upstream.
      
      Recently I started seeing warnings about pages with refcount -1. The
      problem was traced to packets being reused after their head was merged into
      a GRO packet by skb_gro_receive(). While bisecting the issue pointed to
      commit c21b48cc ("net: adjust skb->truesize in ___pskb_trim()") and
      I have never seen it on a kernel with it reverted, I believe the real
      problem appeared earlier when the option to merge head frag in GRO was
      implemented.
      
      Handling NAPI_GRO_FREE_STOLEN_HEAD state was only added to GRO_MERGED_FREE
      branch of napi_skb_finish() so that if the driver uses napi_gro_frags()
      and head is merged (which in my case happens after the skb_condense()
      call added by the commit mentioned above), the skb is reused including the
      head that has been merged. As a result, we release the page reference
      twice and eventually end up with negative page refcount.
      
      To fix the problem, handle NAPI_GRO_FREE_STOLEN_HEAD in napi_frags_finish()
      the same way it's done in napi_skb_finish().
      
      Fixes: d7e8883c ("net: make GRO aware of skb->head_frag")
      Signed-off-by: default avatarMichal Kubecek <mkubecek@suse.cz>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      06732807
    • Daniel Borkmann's avatar
      bpf: prevent leaking pointer via xadd on unpriviledged · cd5de9cb
      Daniel Borkmann authored
      commit 6bdf6abc upstream.
      
      Leaking kernel addresses on unpriviledged is generally disallowed,
      for example, verifier rejects the following:
      
        0: (b7) r0 = 0
        1: (18) r2 = 0xffff897e82304400
        3: (7b) *(u64 *)(r1 +48) = r2
        R2 leaks addr into ctx
      
      Doing pointer arithmetic on them is also forbidden, so that they
      don't turn into unknown value and then get leaked out. However,
      there's xadd as a special case, where we don't check the src reg
      for being a pointer register, e.g. the following will pass:
      
        0: (b7) r0 = 0
        1: (7b) *(u64 *)(r1 +48) = r0
        2: (18) r2 = 0xffff897e82304400 ; map
        4: (db) lock *(u64 *)(r1 +48) += r2
        5: (95) exit
      
      We could store the pointer into skb->cb, loose the type context,
      and then read it out from there again to leak it eventually out
      of a map value. Or more easily in a different variant, too:
      
         0: (bf) r6 = r1
         1: (7a) *(u64 *)(r10 -8) = 0
         2: (bf) r2 = r10
         3: (07) r2 += -8
         4: (18) r1 = 0x0
         6: (85) call bpf_map_lookup_elem#1
         7: (15) if r0 == 0x0 goto pc+3
         R0=map_value(ks=8,vs=8,id=0),min_value=0,max_value=0 R6=ctx R10=fp
         8: (b7) r3 = 0
         9: (7b) *(u64 *)(r0 +0) = r3
        10: (db) lock *(u64 *)(r0 +0) += r6
        11: (b7) r0 = 0
        12: (95) exit
      
        from 7 to 11: R0=inv,min_value=0,max_value=0 R6=ctx R10=fp
        11: (b7) r0 = 0
        12: (95) exit
      
      Prevent this by checking xadd src reg for pointer types. Also
      add a couple of test cases related to this.
      
      Fixes: 1be7f75d ("bpf: enable non-root eBPF programs")
      Fixes: 17a52670 ("bpf: verifier (add verifier core)")
      Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
      Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
      Acked-by: default avatarMartin KaFai Lau <kafai@fb.com>
      Acked-by: default avatarEdward Cree <ecree@solarflare.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      cd5de9cb
    • Dan Carpenter's avatar
      rocker: move dereference before free · bee80705
      Dan Carpenter authored
      commit acb4b7df upstream.
      
      My static checker complains that ofdpa_neigh_del() can sometimes free
      "found".   It just makes sense to use it first before deleting it.
      
      Fixes: ecf244f7 ("rocker: fix maybe-uninitialized warning")
      Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      bee80705
    • Eduardo Valentin's avatar
      bridge: mdb: fix leak on complete_info ptr on fail path · e5e5c0ec
      Eduardo Valentin authored
      commit 1bfb1596 upstream.
      
      We currently get the following kmemleak report:
      unreferenced object 0xffff8800039d9820 (size 32):
        comm "softirq", pid 0, jiffies 4295212383 (age 792.416s)
        hex dump (first 32 bytes):
          00 0c e0 03 00 88 ff ff ff 02 00 00 00 00 00 00  ................
          00 00 00 01 ff 11 00 02 86 dd 00 00 ff ff ff ff  ................
        backtrace:
          [<ffffffff8152b4aa>] kmemleak_alloc+0x4a/0xa0
          [<ffffffff811d8ec8>] kmem_cache_alloc_trace+0xb8/0x1c0
          [<ffffffffa0389683>] __br_mdb_notify+0x2a3/0x300 [bridge]
          [<ffffffffa038a0ce>] br_mdb_notify+0x6e/0x70 [bridge]
          [<ffffffffa0386479>] br_multicast_add_group+0x109/0x150 [bridge]
          [<ffffffffa0386518>] br_ip6_multicast_add_group+0x58/0x60 [bridge]
          [<ffffffffa0387fb5>] br_multicast_rcv+0x1d5/0xdb0 [bridge]
          [<ffffffffa037d7cf>] br_handle_frame_finish+0xcf/0x510 [bridge]
          [<ffffffffa03a236b>] br_nf_hook_thresh.part.27+0xb/0x10 [br_netfilter]
          [<ffffffffa03a3738>] br_nf_hook_thresh+0x48/0xb0 [br_netfilter]
          [<ffffffffa03a3fb9>] br_nf_pre_routing_finish_ipv6+0x109/0x1d0 [br_netfilter]
          [<ffffffffa03a4400>] br_nf_pre_routing_ipv6+0xd0/0x14c [br_netfilter]
          [<ffffffffa03a3c27>] br_nf_pre_routing+0x197/0x3d0 [br_netfilter]
          [<ffffffff814a2952>] nf_iterate+0x52/0x60
          [<ffffffff814a29bc>] nf_hook_slow+0x5c/0xb0
          [<ffffffffa037ddf4>] br_handle_frame+0x1a4/0x2c0 [bridge]
      
      This happens when switchdev_port_obj_add() fails. This patch
      frees complete_info object in the fail path.
      Reviewed-by: default avatarVallish Vaidyeshwara <vallish@amazon.com>
      Signed-off-by: default avatarEduardo Valentin <eduval@amazon.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      e5e5c0ec
    • Eric Dumazet's avatar
      net: prevent sign extension in dev_get_stats() · 3f04c32b
      Eric Dumazet authored
      commit 6f64ec74 upstream.
      
      Similar to the fix provided by Dominik Heidler in commit
      9b3dc0a1 ("l2tp: cast l2tp traffic counter to unsigned")
      we need to take care of 32bit kernels in dev_get_stats().
      
      When using atomic_long_read(), we add a 'long' to u64 and
      might misinterpret high order bit, unless we cast to unsigned.
      
      Fixes: caf586e5 ("net: add a core netdev->rx_dropped counter")
      Fixes: 015f0688 ("net: net: add a core netdev->tx_dropped counter")
      Fixes: 6e7333d3 ("net: add rx_nohandler stat counter")
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Cc: Jarod Wilson <jarod@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      3f04c32b
    • WANG Cong's avatar
      tcp: reset sk_rx_dst in tcp_disconnect() · ef138400
      WANG Cong authored
      commit d747a7a5 upstream.
      
      We have to reset the sk->sk_rx_dst when we disconnect a TCP
      connection, because otherwise when we re-connect it this
      dst reference is simply overridden in tcp_finish_connect().
      
      This fixes a dst leak which leads to a loopback dev refcnt
      leak. It is a long-standing bug, Kevin reported a very similar
      (if not same) bug before. Thanks to Andrei for providing such
      a reliable reproducer which greatly narrows down the problem.
      
      Fixes: 41063e9d ("ipv4: Early TCP socket demux.")
      Reported-by: default avatarAndrei Vagin <avagin@gmail.com>
      Reported-by: default avatarKevin Xu <kaiwen.xu@hulu.com>
      Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      ef138400