[rsbac] Random "file not found" errors

[Oliver Breuer]

here the problem occurs quite often. It occurs not only with virtual-fs. I even cannot compile a kernel because it stops compiling already after a short time complaining about some random file not found. When running under a non rsbac-kernel, the same compilation completes without errors.

Oliver


RSBAC Discussion and Announcements <rsbac at rsbac.org> schrieb am 03.06.05 14:33:24:

> I have already mentioned this on this list on January 21, 2005. 
> The problem continues on my boxes at random times and very seldom (a 
> couple of times a week). The only thing that I noticed it is that it has 
> to do always with some SYM-LINKS, independently if the file is protected
> with RC, FF or other modules. No clue of the reason, but something with 
> virtual-fs and RSBAC perhaps.
> 
> Andrea
> 
> 
> On Thu, May 12, 2005 at 02:56:07PM +0200, Oliver Breuer wrote:
> *  Hi all,
> * 
> * when using the 2.6.11-Kernel with RSBAC 1.2.4, at random times random
> * files are not found when trying to access them. But this occures only
> * at random times. The next try (just one second later), the file can be
> * accessed. There are no log messages generated from RSBAC.
> * 
> * After a lot of trying I found one reproducible case:
> * 
> * - tmpfs mounted on /sysmnt/shmtmp/shm
> *   -> unix-mode: rwxrwxrwt
> * - symlink /shm -> /sysmnt/shmtmp/shm
> * - normal user "testuser"
> *   -> no RC-writing rights to / (only CHDIR, CLOSE, GET_PERMISSIONS_DATA, GET_STATUS_DATA, READ, READ_OPEN, SEARCH)
> *   -> RC-writing rights to /sysmnt/shmtmp (APPEND, CHDIR, CLOSE, CREATE, DELETE, GET_PERMISSIONS_DATA, GET_STATUS_DATA, LINK_HARD, MODIFY_ACCESS_DATA, MODIFY_PERMISSIONS_DATA, READ, READ_WRITE_OPEN, READ_OPEN, RENAME, SEARCH, TRUNCATE, WRITE, WRITE_OPEN)
> * - as user "testuser":
> *   -> mkdir /shm/test1
> *   -> mkdir /shm/test1/test2
> *   -> mkdir /home/testuser/test3
> *   -> cd /home/testuser/test3
> *   -> ln -s /shm/test1/test2 test4
> *   -> ls test4/
> *     => no such file or directory!
> *   -> ls /shm/test1/test2/
> *     => no problems
> * 
> * The access through the symlink "/shm -> /sysmnt/shmtmp/shm" somehow doesn't work. When I boot a kernel compiled the same .config-file but without the rsbac-patch, there are no problems.
> * 
> 

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