Archived:Binary-incompatible change in Open C to require proper permission checks for creating IPC resources (Known Issue)
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[[Category:Symbian C++]] | [[Category:Symbian C++]] | ||
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{{KBKI}} | {{KBKI}} | ||
__NOTOC__ | __NOTOC__ | ||
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|platform=S60 3rd Edition | |platform=S60 3rd Edition | ||
|devices=All (S60 3rd Edition devices) | |devices=All (S60 3rd Edition devices) | ||
| − | |category=Open C | + | |category=Open C/C++ |
|subcategory=IPC, Compatibility | |subcategory=IPC, Compatibility | ||
|creationdate=August 20, 2008 | |creationdate=August 20, 2008 | ||
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==Solution== | ==Solution== | ||
| − | Starting from the next Open C release, <tt>IPC_CREAT</tt> has to be OR-ed with <tt>READ (0400)</tt> or/and <tt>WRITE (0200)</tt> permission. | + | Starting from the next Open C release, <tt>IPC_CREAT</tt> has to be OR-ed with <tt>READ (0400)</tt> or/and <tt>WRITE (0200)</tt> permission.[[Category:Open C/C++]][[Category:Known Issue]][[Category:S60 3rd Edition]] |
Revision as of 04:11, 18 March 2011
Article Metadata
Tested with
Devices(s): All (S60 3rd Edition devices)
Compatibility
Platform(s): S60 3rd Edition
Article
Created: (20 Aug 2008)
Last edited: hamishwillee
(18 Mar 2011)
Overview
To improve the performance and better adhere to POSIX standards, the next release of Open C will undergo some changes in the architecture. Some of the changes will also affect the binary compatibility with previous releases.
Description
Proper permissions must now be defined when creating IPC (inter-process communication) resources (shm, semaphore</tt, and <tt>msgqueue). The flag argument (value) can no longer be just IPC_CREAT. Specifying only IPC_CREAT means that the IPC resource is created with absolutely no permissions, and will result in EACCESS error.
How to reproduce
int msgid;
struct msqid_ds buf = {0};
msgid = msgget(1000, 512); /* returns with errno = 13 */
Solution
Starting from the next Open C release, IPC_CREAT has to be OR-ed with READ (0400) or/and WRITE (0200) permission.
