1. 09 5月, 2017 1 次提交
  2. 02 3月, 2017 1 次提交
  3. 28 2月, 2017 1 次提交
  4. 19 2月, 2017 1 次提交
  5. 25 12月, 2016 1 次提交
  6. 08 10月, 2016 1 次提交
  7. 07 10月, 2016 1 次提交
  8. 28 9月, 2016 1 次提交
  9. 27 9月, 2016 2 次提交
  10. 22 9月, 2016 1 次提交
  11. 01 8月, 2016 1 次提交
  12. 21 7月, 2016 1 次提交
  13. 11 6月, 2016 1 次提交
    • L
      vfs: make the string hashes salt the hash · 8387ff25
      Linus Torvalds 提交于
      We always mixed in the parent pointer into the dentry name hash, but we
      did it late at lookup time.  It turns out that we can simplify that
      lookup-time action by salting the hash with the parent pointer early
      instead of late.
      
      A few other users of our string hashes also wanted to mix in their own
      pointers into the hash, and those are updated to use the same mechanism.
      
      Hash users that don't have any particular initial salt can just use the
      NULL pointer as a no-salt.
      
      Cc: Vegard Nossum <vegard.nossum@oracle.com>
      Cc: George Spelvin <linux@sciencehorizons.net>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      8387ff25
  14. 30 5月, 2016 1 次提交
  15. 28 5月, 2016 1 次提交
  16. 13 5月, 2016 1 次提交
  17. 02 5月, 2016 1 次提交
  18. 11 4月, 2016 1 次提交
  19. 05 4月, 2016 1 次提交
    • K
      mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros · 09cbfeaf
      Kirill A. Shutemov 提交于
      PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
      ago with promise that one day it will be possible to implement page
      cache with bigger chunks than PAGE_SIZE.
      
      This promise never materialized.  And unlikely will.
      
      We have many places where PAGE_CACHE_SIZE assumed to be equal to
      PAGE_SIZE.  And it's constant source of confusion on whether
      PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
      especially on the border between fs and mm.
      
      Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
      breakage to be doable.
      
      Let's stop pretending that pages in page cache are special.  They are
      not.
      
      The changes are pretty straight-forward:
      
       - <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
      
       - <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
      
       - PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
      
       - page_cache_get() -> get_page();
      
       - page_cache_release() -> put_page();
      
      This patch contains automated changes generated with coccinelle using
      script below.  For some reason, coccinelle doesn't patch header files.
      I've called spatch for them manually.
      
      The only adjustment after coccinelle is revert of changes to
      PAGE_CAHCE_ALIGN definition: we are going to drop it later.
      
      There are few places in the code where coccinelle didn't reach.  I'll
      fix them manually in a separate patch.  Comments and documentation also
      will be addressed with the separate patch.
      
      virtual patch
      
      @@
      expression E;
      @@
      - E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
      + E
      
      @@
      expression E;
      @@
      - E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
      + E
      
      @@
      @@
      - PAGE_CACHE_SHIFT
      + PAGE_SHIFT
      
      @@
      @@
      - PAGE_CACHE_SIZE
      + PAGE_SIZE
      
      @@
      @@
      - PAGE_CACHE_MASK
      + PAGE_MASK
      
      @@
      expression E;
      @@
      - PAGE_CACHE_ALIGN(E)
      + PAGE_ALIGN(E)
      
      @@
      expression E;
      @@
      - page_cache_get(E)
      + get_page(E)
      
      @@
      expression E;
      @@
      - page_cache_release(E)
      + put_page(E)
      Signed-off-by: NKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Acked-by: NMichal Hocko <mhocko@suse.com>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      09cbfeaf
  20. 23 1月, 2016 1 次提交
    • A
      wrappers for ->i_mutex access · 5955102c
      Al Viro 提交于
      parallel to mutex_{lock,unlock,trylock,is_locked,lock_nested},
      inode_foo(inode) being mutex_foo(&inode->i_mutex).
      
      Please, use those for access to ->i_mutex; over the coming cycle
      ->i_mutex will become rwsem, with ->lookup() done with it held
      only shared.
      Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      5955102c
  21. 21 1月, 2016 1 次提交
  22. 15 1月, 2016 1 次提交
    • V
      kmemcg: account certain kmem allocations to memcg · 5d097056
      Vladimir Davydov 提交于
      Mark those kmem allocations that are known to be easily triggered from
      userspace as __GFP_ACCOUNT/SLAB_ACCOUNT, which makes them accounted to
      memcg.  For the list, see below:
      
       - threadinfo
       - task_struct
       - task_delay_info
       - pid
       - cred
       - mm_struct
       - vm_area_struct and vm_region (nommu)
       - anon_vma and anon_vma_chain
       - signal_struct
       - sighand_struct
       - fs_struct
       - files_struct
       - fdtable and fdtable->full_fds_bits
       - dentry and external_name
       - inode for all filesystems. This is the most tedious part, because
         most filesystems overwrite the alloc_inode method.
      
      The list is far from complete, so feel free to add more objects.
      Nevertheless, it should be close to "account everything" approach and
      keep most workloads within bounds.  Malevolent users will be able to
      breach the limit, but this was possible even with the former "account
      everything" approach (simply because it did not account everything in
      fact).
      
      [akpm@linux-foundation.org: coding-style fixes]
      Signed-off-by: NVladimir Davydov <vdavydov@virtuozzo.com>
      Acked-by: NJohannes Weiner <hannes@cmpxchg.org>
      Acked-by: NMichal Hocko <mhocko@suse.com>
      Cc: Tejun Heo <tj@kernel.org>
      Cc: Greg Thelen <gthelen@google.com>
      Cc: Christoph Lameter <cl@linux.com>
      Cc: Pekka Enberg <penberg@kernel.org>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      5d097056
  23. 04 1月, 2016 1 次提交
  24. 11 9月, 2015 2 次提交
  25. 05 9月, 2015 1 次提交
    • K
      fs: create and use seq_show_option for escaping · a068acf2
      Kees Cook 提交于
      Many file systems that implement the show_options hook fail to correctly
      escape their output which could lead to unescaped characters (e.g.  new
      lines) leaking into /proc/mounts and /proc/[pid]/mountinfo files.  This
      could lead to confusion, spoofed entries (resulting in things like
      systemd issuing false d-bus "mount" notifications), and who knows what
      else.  This looks like it would only be the root user stepping on
      themselves, but it's possible weird things could happen in containers or
      in other situations with delegated mount privileges.
      
      Here's an example using overlay with setuid fusermount trusting the
      contents of /proc/mounts (via the /etc/mtab symlink).  Imagine the use
      of "sudo" is something more sneaky:
      
        $ BASE="ovl"
        $ MNT="$BASE/mnt"
        $ LOW="$BASE/lower"
        $ UP="$BASE/upper"
        $ WORK="$BASE/work/ 0 0
        none /proc fuse.pwn user_id=1000"
        $ mkdir -p "$LOW" "$UP" "$WORK"
        $ sudo mount -t overlay -o "lowerdir=$LOW,upperdir=$UP,workdir=$WORK" none /mnt
        $ cat /proc/mounts
        none /root/ovl/mnt overlay rw,relatime,lowerdir=ovl/lower,upperdir=ovl/upper,workdir=ovl/work/ 0 0
        none /proc fuse.pwn user_id=1000 0 0
        $ fusermount -u /proc
        $ cat /proc/mounts
        cat: /proc/mounts: No such file or directory
      
      This fixes the problem by adding new seq_show_option and
      seq_show_option_n helpers, and updating the vulnerable show_option
      handlers to use them as needed.  Some, like SELinux, need to be open
      coded due to unusual existing escape mechanisms.
      
      [akpm@linux-foundation.org: add lost chunk, per Kees]
      [keescook@chromium.org: seq_show_option should be using const parameters]
      Signed-off-by: NKees Cook <keescook@chromium.org>
      Acked-by: NSerge Hallyn <serge.hallyn@canonical.com>
      Acked-by: NJan Kara <jack@suse.com>
      Acked-by: NPaul Moore <paul@paul-moore.com>
      Cc: J. R. Okajima <hooanon05g@gmail.com>
      Signed-off-by: NKees Cook <keescook@chromium.org>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      a068acf2
  26. 24 6月, 2015 1 次提交
  27. 02 6月, 2015 1 次提交
    • T
      writeback: separate out include/linux/backing-dev-defs.h · 66114cad
      Tejun Heo 提交于
      With the planned cgroup writeback support, backing-dev related
      declarations will be more widely used across block and cgroup;
      unfortunately, including backing-dev.h from include/linux/blkdev.h
      makes cyclic include dependency quite likely.
      
      This patch separates out backing-dev-defs.h which only has the
      essential definitions and updates blkdev.h to include it.  c files
      which need access to more backing-dev details now include
      backing-dev.h directly.  This takes backing-dev.h off the common
      include dependency chain making it a lot easier to use it across block
      and cgroup.
      
      v2: fs/fat build failure fixed.
      Signed-off-by: NTejun Heo <tj@kernel.org>
      Reviewed-by: NJan Kara <jack@suse.cz>
      Cc: Jens Axboe <axboe@kernel.dk>
      Signed-off-by: NJens Axboe <axboe@fb.com>
      66114cad
  28. 17 4月, 2015 1 次提交
  29. 16 4月, 2015 1 次提交
  30. 12 4月, 2015 4 次提交
  31. 26 3月, 2015 1 次提交
  32. 11 12月, 2014 1 次提交
  33. 14 10月, 2014 1 次提交
  34. 07 5月, 2014 2 次提交
反馈
建议
客服 返回
顶部