1. 28 Sep, 2016 3 commits
  2. 27 Sep, 2016 7 commits
    • Eric Biggers's avatar
      fs/buffer.c: make __getblk_slow() static · 0026ba40
      Eric Biggers authored
      __getblk_slow() was exported to modules in commit 3b5e6454
      
      
      ("fs/buffer.c: support buffer cache allocations with gfp modifiers").
      This seems to have been a mistake, as no users were introduced nor was
      the function declared in a header.  Change it back to 'static'.
      Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      0026ba40
    • Alexey Dobriyan's avatar
      proc: unsigned file descriptors · 771187d6
      Alexey Dobriyan authored
      
      
      Make struct proc_inode::fd unsigned.
      
      This allows better code generation on x86_64 (less sign extensions).
      Signed-off-by: default avatarAlexey Dobriyan <adobriyan@gmail.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      771187d6
    • Alexey Dobriyan's avatar
      fs/file: more unsigned file descriptors · 9b80a184
      Alexey Dobriyan authored
      
      
      Propagate unsignedness for grand total of 149 bytes:
      
      	$ ./scripts/bloat-o-meter ../vmlinux-000 ../obj/vmlinux
      	add/remove: 0/0 grow/shrink: 0/10 up/down: 0/-149 (-149)
      	function                                     old     new   delta
      	set_close_on_exec                             99      98      -1
      	put_files_struct                             201     200      -1
      	get_close_on_exec                             59      58      -1
      	do_prlimit                                   498     497      -1
      	do_execveat_common.isra                     1662    1661      -1
      	__close_fd                                   178     173      -5
      	do_dup2                                      219     204     -15
      	seq_show                                     685     660     -25
      	__alloc_fd                                   384     357     -27
      	dup_fd                                       718     646     -72
      
      It mostly comes from converting "unsigned int" to "long" for bit operations.
      Signed-off-by: default avatarAlexey Dobriyan <adobriyan@gmail.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      9b80a184
    • Shawn Lin's avatar
      fs: compat: remove redundant check of nr_segs · 85e7340f
      Shawn Lin authored
      
      
      nr_segs should never be less than zero as its type
      is unsigned long, so let's remove this check.
      Signed-off-by: default avatarShawn Lin <shawn.lin@rock-chips.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      85e7340f
    • David Howells's avatar
      cachefiles: Fix attempt to read i_blocks after deleting file [ver #2] · a818101d
      David Howells authored
      An NULL-pointer dereference happens in cachefiles_mark_object_inactive()
      when it tries to read i_blocks so that it can tell the cachefilesd daemon
      how much space it's making available.
      
      The problem is that cachefiles_drop_object() calls
      cachefiles_mark_object_inactive() after calling cachefiles_delete_object()
      because the object being marked active staves off attempts to (re-)use the
      file at that filename until after it has been deleted.  This means that
      d_inode is NULL by the time we come to try to access it.
      
      To fix the problem, have the caller of cachefiles_mark_object_inactive()
      supply the number of blocks freed up.
      
      Without this, the following oops may occur:
      
      BUG: unable to handle kernel NULL pointer dereference at 0000000000000098
      IP: [<ffffffffa06c5cc1>] cachefiles_mark_object_inactive+0x61/0xb0 [cachefiles]
      ...
      CPU: 11 PID: 527 Comm: kworker/u64:4 Tainted: G          I    ------------   3.10.0-470.el7.x86_64 #1
      Hardware name: Hewlett-Packard HP Z600 Workstation/0B54h, BIOS 786G4 v03.19 03/11/2011
      Workqueue: fscache_object fscache_object_work_func [fscache]
      task: ffff880035edaf10 ti: ffff8800b77c0000 task.ti: ffff8800b77c0000
      RIP: 0010:[<ffffffffa06c5cc1>] cachefiles_mark_object_inactive+0x61/0xb0 [cachefiles]
      RSP: 0018:ffff8800b77c3d70  EFLAGS: 00010246
      RAX: 0000000000000000 RBX: ffff8800bf6cc400 RCX: 0000000000000034
      RDX: 0000000000000000 RSI: ffff880090ffc710 RDI: ffff8800bf761ef8
      RBP: ffff8800b77c3d88 R08: 2000000000000000 R09: 0090ffc710000000
      R10: ff51005d2ff1c400 R11: 0000000000000000 R12: ffff880090ffc600
      R13: ffff8800bf6cc520 R14: ffff8800bf6cc400 R15: ffff8800bf6cc498
      FS:  0000000000000000(0000) GS:ffff8800bb8c0000(0000) knlGS:0000000000000000
      CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
      CR2: 0000000000000098 CR3: 00000000019ba000 CR4: 00000000000007e0
      DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
      Stack:
       ffff880090ffc600 ffff8800bf6cc400 ffff8800867df140 ffff8800b77c3db0
       ffffffffa06c48cb ffff880090ffc600 ffff880090ffc180 ffff880090ffc658
       ffff8800b77c3df0 ffffffffa085d846 ffff8800a96b8150 ffff880090ffc600
      Call Trace:
       [<ffffffffa06c48cb>] cachefiles_drop_object+0x6b/0xf0 [cachefiles]
       [<ffffffffa085d846>] fscache_drop_object+0xd6/0x1e0 [fscache]
       [<ffffffffa085d615>] fscache_object_work_func+0xa5/0x200 [fscache]
       [<ffffffff810a605b>] process_one_work+0x17b/0x470
       [<ffffffff810a6e96>] worker_thread+0x126/0x410
       [<ffffffff810a6d70>] ? rescuer_thread+0x460/0x460
       [<ffffffff810ae64f>] kthread+0xcf/0xe0
       [<ffffffff810ae580>] ? kthread_create_on_node+0x140/0x140
       [<ffffffff81695418>] ret_from_fork+0x58/0x90
       [<ffffffff810ae580>] ? kthread_create_on_node+0x140/0x140
      
      The oopsing code shows:
      
      	callq  0xffffffff810af6a0 <wake_up_bit>
      	mov    0xf8(%r12),%rax
      	mov    0x30(%rax),%rax
      	mov    0x98(%rax),%rax   <---- oops here
      	lock add %rax,0x130(%rbx)
      
      where this is:
      
      	d_backing_inode(object->dentry)->i_blocks
      
      Fixes: a5b3a80b
      
       (CacheFiles: Provide read-and-reset release counters for cachefilesd)
      Reported-by: default avatarJianhong Yin <jiyin@redhat.com>
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Reviewed-by: default avatarJeff Layton <jlayton@redhat.com>
      Reviewed-by: default avatarSteve Dickson <steved@redhat.com>
      cc: stable@vger.kernel.org
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      a818101d
    • Al Viro's avatar
      cifs: don't use memcpy() to copy struct iov_iter · fc56b983
      Al Viro authored
      
      
      it's not 70s anymore.
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      fc56b983
    • Al Viro's avatar
      get rid of separate multipage fault-in primitives · 4bce9f6e
      Al Viro authored
      
      
      * the only remaining callers of "short" fault-ins are just as happy with generic
      variants (both in lib/iov_iter.c); switch them to multipage variants, kill the
      "short" ones
      * rename the multipage variants to now available plain ones.
      * get rid of compat macro defining iov_iter_fault_in_multipage_readable by
      expanding it in its only user.
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      4bce9f6e
  3. 26 Sep, 2016 3 commits
  4. 25 Sep, 2016 7 commits
    • Lorenzo Stoakes's avatar
      mm: check VMA flags to avoid invalid PROT_NONE NUMA balancing · 38e08854
      Lorenzo Stoakes authored
      The NUMA balancing logic uses an arch-specific PROT_NONE page table flag
      defined by pte_protnone() or pmd_protnone() to mark PTEs or huge page
      PMDs respectively as requiring balancing upon a subsequent page fault.
      User-defined PROT_NONE memory regions which also have this flag set will
      not normally invoke the NUMA balancing code as do_page_fault() will send
      a segfault to the process before handle_mm_fault() is even called.
      
      However if access_remote_vm() is invoked to access a PROT_NONE region of
      memory, handle_mm_fault() is called via faultin_page() and
      __get_user_pages() without any access checks being performed, meaning
      the NUMA balancing logic is incorrectly invoked on a non-NUMA memory
      region.
      
      A simple means of triggering this problem is to access PROT_NONE mmap'd
      memory using /proc/self/mem which reliably results in the NUMA handling
      functions being invoked when CONFIG_NUMA_BALANCING is set.
      
      This issue was reported in bugzilla (issue 99101) which includes some
      simple repro code.
      
      There are BUG_ON() checks in do_numa_page() and do_huge_pmd_numa_page()
      added at commit c0e7cad9 to avoid accidentally provoking strange
      behaviour by attempting to apply NUMA balancing to pages that are in
      fact PROT_NONE.  The BUG_ON()'s are consistently triggered by the repro.
      
      This patch moves the PROT_NONE check into mm/memory.c rather than
      invoking BUG_ON() as faulting in these pages via faultin_page() is a
      valid reason for reaching the NUMA check with the PROT_NONE page table
      flag set and is therefore not always a bug.
      
      Link: https://bugzilla.kernel.org/show_bug.cgi?id=99101
      
      Reported-by: default avatarTrevor Saunders <tbsaunde@tbsaunde.org>
      Signed-off-by: default avatarLorenzo Stoakes <lstoakes@gmail.com>
      Acked-by: default avatarRik van Riel <riel@redhat.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Mel Gorman <mgorman@techsingularity.net>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      38e08854
    • Linus Torvalds's avatar
      Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus · 831e45d8
      Linus Torvalds authored
      Pull MIPS fixes from Ralf Baechle:
       "A round of 4.8 fixes:
      
        MIPS generic code:
         - Add a missing ".set pop" in an early commit
         - Fix memory regions reaching top of physical
         - MAAR: Fix address alignment
         - vDSO: Fix Malta EVA mapping to vDSO page structs
         - uprobes: fix incorrect uprobe brk handling
         - uprobes: select HAVE_REGS_AND_STACK_ACCESS_API
         - Avoid a BUG warning during PR_SET_FP_MODE prctl
         - SMP: Fix possibility of deadlock when bringing CPUs online
         - R6: Remove compact branch policy Kconfig entries
         - Fix size calc when avoiding IPIs for small icache flushes
         - Fix pre-r6 emulation FPU initialisation
         - Fix delay slot emulation count in debugfs
      
        ATH79:
         - Fix test for error return of clk_register_fixed_factor.
      
        Octeon:
         - Fix kernel header to work for VDSO build.
         - Fix initialization of platform device probing.
      
        paravirt:
         - Fix undefined reference to smp_bootstrap"
      
      * 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
        MIPS: Fix delay slot emulation count in debugfs
        MIPS: SMP: Fix possibility of deadlock when bringing CPUs online
        MIPS: Fix pre-r6 emulation FPU initialisation
        MIPS: vDSO: Fix Malta EVA mapping to vDSO page structs
        MIPS: Select HAVE_REGS_AND_STACK_ACCESS_API
        MIPS: Octeon: Fix platform bus probing
        MIPS: Octeon: mangle-port: fix build failure with VDSO code
        MIPS: Avoid a BUG warning during prctl(PR_SET_FP_MODE, ...)
        MIPS: c-r4k: Fix size calc when avoiding IPIs for small icache flushes
        MIPS: Add a missing ".set pop" in an early commit
        MIPS: paravirt: Fix undefined reference to smp_bootstrap
        MIPS: Remove compact branch policy Kconfig entries
        MIPS: MAAR: Fix address alignment
        MIPS: Fix memory regions reaching top of physical
        MIPS: uprobes: fix incorrect uprobe brk handling
        MIPS: ath79: Fix test for error return of clk_register_fixed_factor().
      831e45d8
    • Linus Torvalds's avatar
      Merge tag 'powerpc-4.8-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux · 751b9a5d
      Linus Torvalds authored
      Pull one more powerpc fix from Michael Ellerman:
       "powernv/pci: Fix m64 checks for SR-IOV and window alignment from
        Russell Currey"
      
      * tag 'powerpc-4.8-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
        powerpc/powernv/pci: Fix m64 checks for SR-IOV and window alignment
      751b9a5d
    • Linus Torvalds's avatar
      radix tree: fix sibling entry handling in radix_tree_descend() · 8d2c0d36
      Linus Torvalds authored
      The fixes to the radix tree test suite show that the multi-order case is
      broken.  The basic reason is that the radix tree code uses tagged
      pointers with the "internal" bit in the low bits, and calculating the
      pointer indices was supposed to mask off those bits.  But gcc will
      notice that we then use the index to re-create the pointer, and will
      avoid doing the arithmetic and use the tagged pointer directly.
      
      This cleans the code up, using the existing is_sibling_entry() helper to
      validate the sibling pointer range (instead of open-coding it), and
      using entry_to_node() to mask off the low tag bit from the pointer.  And
      once you do that, you might as well just use the now cleaned-up pointer
      directly.
      
      [ Side note: the multi-order code isn't actually ever used in the kernel
        right now, and the only reason I didn't just delete all that code is
        that Kirill Shutemov piped up and said:
      
          "Well, my ext4-with-huge-pages patchset[1] uses multi-order entries.
           It also converts shmem-with-huge-pages and hugetlb to them.
      
           I'm okay with converting it to other mechanism, but I need
           something.  (I looked into Konstantin's RFC patchset[2].  It looks
           okay, but I don't feel myself qualified to review it as I don't
           know much about radix-tree internals.)"
      
        [1] http://lkml.kernel.org/r/20160915115523.29737-1-kirill.shutemov@linux.intel.com
        [2] http://lkml.kernel.org/r/147230727479.9957.1087787722571077339.stgit@zurg
      
       ]
      Reported-by: default avatarMatthew Wilcox <mawilcox@microsoft.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Cc: Konstantin Khlebnikov <koct9i@gmail.com>
      Cc: Cedric Blancher <cedric.blancher@gmail.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8d2c0d36
    • Matthew Wilcox's avatar
      radix tree test suite: Test radix_tree_replace_slot() for multiorder entries · 62fd5258
      Matthew Wilcox authored
      
      
      When we replace a multiorder entry, check that all indices reflect the
      new value.
      
      Also, compile the test suite with -O2, which shows other problems with
      the code due to some dodgy pointer operations in the radix tree code.
      Signed-off-by: default avatarMatthew Wilcox <mawilcox@microsoft.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      62fd5258
    • Al Viro's avatar
      fix memory leaks in tracing_buffers_splice_read() · 1ae2293d
      Al Viro authored
      
      
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      1ae2293d
    • Steven Rostedt (Red Hat)'s avatar
      tracing: Move mutex to protect against resetting of seq data · 1245800c
      Steven Rostedt (Red Hat) authored
      The iter->seq can be reset outside the protection of the mutex. So can
      reading of user data. Move the mutex up to the beginning of the function.
      
      Fixes: d7350c3f
      
       ("tracing/core: make the read callbacks reentrants")
      Cc: stable@vger.kernel.org # 2.6.30+
      Reported-by: default avatarAl Viro <viro@ZenIV.linux.org.uk>
      Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      1245800c
  5. 24 Sep, 2016 10 commits
  6. 23 Sep, 2016 10 commits