1. 14 Mar, 2012 7 commits
  2. 10 Mar, 2012 4 commits
    • Linus Torvalds's avatar
      Linux 3.3-rc7 · fde7d904
      Linus Torvalds authored
      fde7d904
    • Al Viro's avatar
      aio: fix the "too late munmap()" race · c7b28555
      Al Viro authored
      Current code has put_ioctx() called asynchronously from aio_fput_routine();
      that's done *after* we have killed the request that used to pin ioctx,
      so there's nothing to stop io_destroy() waiting in wait_for_all_aios()
      from progressing.  As the result, we can end up with async call of
      put_ioctx() being the last one and possibly happening during exit_mmap()
      or elf_core_dump(), neither of which expects stray munmap() being done
      to them...
      
      We do need to prevent _freeing_ ioctx until aio_fput_routine() is done
      with that, but that's all we care about - neither io_destroy() nor
      exit_aio() will progress past wait_for_all_aios() until aio_fput_routine()
      does really_put_req(), so the ioctx teardown won't be done until then
      and we don't care about the contents of ioctx past that point.
      
      Since actual freeing of these suckers is RCU-delayed, we don't need to
      bump ioctx refcount when request goes into list for async removal.
      All we need is rcu_read_lock held just over the ->ctx_lock-protected
      area in aio_fput_routine().
      Signed-off-by: default avatarAl Viro <[email protected]>
      Reviewed-by: default avatarJeff Moyer <[email protected]>
      Acked-by: Benjamin LaHaise's avatarBenjamin LaHaise <[email protected]>
      Cc: [email protected]
      Signed-off-by: default avatarLinus Torvalds <[email protected]>
      c7b28555
    • Al Viro's avatar
      aio: fix io_setup/io_destroy race · 86b62a2c
      Al Viro authored
      Have ioctx_alloc() return an extra reference, so that caller would drop it
      on success and not bother with re-grabbing it on failure exit.  The current
      code is obviously broken - io_destroy() from another thread that managed
      to guess the address io_setup() would've returned would free ioctx right
      under us; gets especially interesting if aio_context_t * we pass to
      io_setup() points to PROT_READ mapping, so put_user() fails and we end
      up doing io_destroy() on kioctx another thread has just got freed...
      Signed-off-by: default avatarAl Viro <[email protected]>
      Acked-by: Benjamin LaHaise's avatarBenjamin LaHaise <[email protected]>
      Reviewed-by: default avatarJeff Moyer <[email protected]>
      Cc: [email protected]
      Signed-off-by: default avatarLinus Torvalds <[email protected]>
      86b62a2c
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs · 86e06008
      Linus Torvalds authored
      Pull btrfs updates from Chris Mason:
       "I have two additional and btrfs fixes in my for-linus branch.  One is
        a casting error that leads to memory corruption on i386 during scrub,
        and the other fixes a corner case in the backref walking code (also
        triggered by scrub)."
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
        Btrfs: fix casting error in scrub reada code
        btrfs: fix locking issues in find_parent_nodes()
      86e06008
  3. 09 Mar, 2012 14 commits
  4. 08 Mar, 2012 15 commits