lkml.org 
[lkml]   [2014]   [Nov]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] ipc,sem block sem_lock on sma->lock during sma initialization
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 11/22/2014 08:56 AM, Manfred Spraul wrote:
> Hi Rik,
>
> good catch - I completely forgot to check the initialization
>
> On 11/22/2014 04:40 AM, Rik van Riel wrote:
>>
>> newary initializes a bunch of things after the call to ipc_addid,
>> however some things are initialized inside ipc_addid as well
>>
>> Looking closer at newary, I suppose that it should be possible to
>> move those other initializations before the call to ipc_addid.
>> That would likely get rid of the problem, too.
>>
>> However, I also see this line in newary, and I have no idea what
>> protects that data:
>>
>> ns->used_sems += nsems;
> It should be sem_ids.rwsem, and at least according to the
> documentation both freeary() and newary() hold it.

You're right, that is properly protected already.

- --
All rights reversed
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1

iQEcBAEBAgAGBQJUcLFwAAoJEM553pKExN6DoGwIAJVr0SJWq1sxkRr6quw03OlU
8GUNm8Mz4tVpt1PYSe5r3SIGeT0btEhXjRrqp3IOw7z85Iw5Ed2CwzuLS3aunmpg
hZag9qyArxKBQkbnhtqiM/0AEHbRiju3+sFNC1cQxsdRvLV6QkRveoP5kKvv4v6d
PCMJBHuxL01tPXe5eQC2WjLmI2YPgWWh3fXhDcLt2XTVBI0vwyBiVFc/CtSPERo0
sBF01l/l5KRfOAHduW2kj7KrSF004IgLU7KN5fLG0BzvwlowcHjXgzX7mMCbZrm2
8d8bdEtRJxDZqs4Z9XjDrjXfSdWH/H/5CnfAmvgXA4pswb1lLDLPFbgmt7NUtxk=
=vUfd
-----END PGP SIGNATURE-----


\
 
 \ /
  Last update: 2014-11-22 17:21    [W:0.644 / U:0.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site