KIS001077 - Open C: Proper permission checks for creating IPC resources
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| ID | KIS001077 | Creation date | August 20, 2008 |
| Platform | S60 3rd Edition | Devices | All (S60 3rd Edition devices) |
| Category | Open C | Subcategory | IPC, Compatibility |
| Keywords (APIs, classes, methods, functions): |
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.
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