Re: [PATCH] umask in POSIX message queues

[Krzysztof Benedyczak <golbi@mat.uni.torun.pl>]

On Mon, 26 Sep 2005, Linus Torvalds wrote:

> As far as I can tell, the VFS layer should have done this for us already,
> with code like
>
> 		...
>                 if (!IS_POSIXACL(dir->d_inode))
>                         mode &= ~current->fs->umask;
>                 error = vfs_create(dir->d_inode, path.dentry, mode, nd);
> 		...
>
> in fs/namei.c (open_namei()).
>
> Which path did you come through that didn't do this? That would be the
> real bug, I suspect..

As I noted when creating mqueues with sys_open() the umask is set
correctly just by the code you pointed out. But sys_mq_open() doesn't use
open_namei() nor filp_open(); the reason is extra data - mq_attr - that
must be passed to real mqueue creating code. So the invocation path is:
sys_mq_open() -> do_create() -> vfs_create() -> (vfs create handler)
mqueue_create().

After rereading it I think that the better place for the line setting
umask is do_create() function as it will be on the same level as
open_namei(). I hope this change will clarify things.

If this make sense I'll send a patch.

Best regards
Krzysiek