linux-stable.git/ipc/util.h, branch v4.13.2

ipc/util.h: update documentation for ipc_getref() and ipc_putref()

2017-07-12T23:26:02+00:00

Now that ipc_rcu_alloc() and ipc_rcu_free() are removed, document when
it is valid to use ipc_getref() and ipc_putref().

Link: http://lkml.kernel.org/r/20170525185107.12869-21-manfred@colorfullife.com
Signed-off-by: Manfred Spraul 
Cc: Davidlohr Bueso 
Cc: Kees Cook 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ipc/util: drop ipc_rcu_alloc()

2017-07-12T23:26:02+00:00

No callers remain for ipc_rcu_alloc().  Drop the function.

[manfred@colorfullife.com: Rediff because the memset was temporarily inside ipc_rcu_free()]
Link: http://lkml.kernel.org/r/20170525185107.12869-13-manfred@colorfullife.com
Signed-off-by: Kees Cook 
Signed-off-by: Manfred Spraul 
Cc: Kees Cook 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ipc/util: drop ipc_rcu_free()

2017-07-12T23:26:01+00:00

There are no more callers of ipc_rcu_free(), so remove it.

Link: http://lkml.kernel.org/r/20170525185107.12869-9-manfred@colorfullife.com
Signed-off-by: Kees Cook 
Signed-off-by: Manfred Spraul 
Cc: Davidlohr Bueso 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ipc: drop non-RCU allocation

2017-07-12T23:26:01+00:00

The only users of ipc_alloc() were ipc_rcu_alloc() and the on-heap
sem_io fall-back memory.  Better to just open-code these to make things
easier to read.

[manfred@colorfullife.com: Rediff due to inclusion of memset() into ipc_rcu_alloc()]
Link: http://lkml.kernel.org/r/20170525185107.12869-5-manfred@colorfullife.com
Signed-off-by: Kees Cook 
Signed-off-by: Manfred Spraul 
Cc: Davidlohr Bueso 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ipc: merge ipc_rcu and kern_ipc_perm

2017-07-12T23:26:01+00:00

ipc has two management structures that exist for every id:
 - struct kern_ipc_perm, it contains e.g. the permissions.
 - struct ipc_rcu, it contains the rcu head for rcu handling and the
   refcount.

The patch merges both structures.

As a bonus, we may save one cacheline, because both structures are
cacheline aligned.  In addition, it reduces the number of casts, instead
most codepaths can use container_of.

To simplify code, the ipc_rcu_alloc initializes the allocation to 0.

[manfred@colorfullife.com: really include the memset() into ipc_alloc_rcu()]
  Link: http://lkml.kernel.org/r/564f8612-0601-b267-514f-a9f650ec9b32@colorfullife.com
Link: http://lkml.kernel.org/r/20170525185107.12869-3-manfred@colorfullife.com
Signed-off-by: Manfred Spraul 
Cc: Davidlohr Bueso 
Cc: Kees Cook 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ipc: Remove unused declaration of recompute_msgmni

2017-04-18T02:53:07+00:00

The function recompute_msgmni was removed a while ago
but it is still declared in a header file remove it.

Signed-off-by: "Eric W. Biederman"

tree wide: use kvfree() than conditional kfree()/vfree()

2016-01-23T01:02:18+00:00

There are many locations that do

  if (memory_was_allocated_by_vmalloc)
    vfree(ptr);
  else
    kfree(ptr);

but kvfree() can handle both kmalloc()ed memory and vmalloc()ed memory
using is_vmalloc_addr().  Unless callers have special reasons, we can
replace this branch with kvfree().  Please check and reply if you found
problems.

Signed-off-by: Tetsuo Handa 
Acked-by: Michal Hocko 
Acked-by: Jan Kara 
Acked-by: Russell King 
Reviewed-by: Andreas Dilger 
Acked-by: "Rafael J. Wysocki" 
Acked-by: David Rientjes 
Cc: "Luck, Tony" 
Cc: Oleg Drokin 
Cc: Boris Petkov 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ipc: rename ipc_obtain_object

2015-07-01T02:44:58+00:00

...  to ipc_obtain_object_idr, which is more meaningful and makes the code
slightly easier to follow.

Signed-off-by: Davidlohr Bueso 
Cc: Manfred Spraul 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ipc, kernel: clear whitespace

2014-06-06T23:08:14+00:00

trailing whitespace

Signed-off-by: Paul McQuade 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ipc: constify ipc_ops

2014-06-06T23:08:14+00:00

There is no need to recreate the very same ipc_ops structure on every
kernel entry for msgget/semget/shmget.  Just declare it static and be
done with it.  While at it, constify it as we don't modify the structure
at runtime.

Found in the PaX patch, written by the PaX Team.

Signed-off-by: Mathias Krause 
Cc: PaX Team 
Cc: Davidlohr Bueso 
Cc: Manfred Spraul 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds