Re: [PATCH v2] Add security.* XATTR support for the UBIFS

[Subodh Nijsure]

On Tue, Apr 10, 2012 at 5:46 AM, Stephen Smalley <sds@xxxxxxxxxxxxx> wrote:
> On Mon, 2012-04-09 at 16:51 -0700, subodh.nijsure@xxxxxxxxx wrote:
>> From: Subodh Nijsure <snijsure@xxxxxxxxxxxx>
>>
>> Also fix couple of bugs in UBIFS extended attribute length calculation.
>>
>> Changes Since V1:
>> Â Â Â Â ÂInstead of just handling security.selinux extended attribute handle
>> Â Â Â Â Âall security.* attributes.
>>
>> TESTING: Tested on ÂMX28 based platforms using Micron MT29F2G08ABAEAH4 NAND
>> Â Â Â Â ÂWith these change we are able to label UBIFS filesystem with
>> Â Â Â Â Âsecurity.selinux and run system with selinux enabled.
>> Â Â Â Â ÂThis change also allows one to set other security.* extended
>> Â Â Â Â Âattributesr, such as security.smack security.evm, security.ima
>> Â Â Â Â ÂRan integck test on UBI filesystem.
>>
>> Signed-off-by: Subodh Nijsure <snijsure@xxxxxxxxxxxx>
>> ---
>> Âfs/ubifs/dir.c   |  Â4 ++
>> Âfs/ubifs/file.c  Â|  Â6 ++
>> Âfs/ubifs/journal.c | Â 12 +++-
>> Âfs/ubifs/super.c  |  Â3 +
>> Âfs/ubifs/ubifs.h  |  Â9 +++
>> Âfs/ubifs/xattr.c  | Â147 ++++++++++++++++++++++++++++++++++++++++++++++++----
>> Â6 files changed, 167 insertions(+), 14 deletions(-)
>>
>> diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
>> index ec9f187..f4e06c4 100644
>> --- a/fs/ubifs/dir.c
>> +++ b/fs/ubifs/dir.c
>> @@ -293,6 +293,7 @@ static int ubifs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
>> Â Â Â ubifs_release_budget(c, &req);
>> Â Â Â insert_inode_hash(inode);
>> Â Â Â d_instantiate(dentry, inode);
>> + Â Â ubifs_init_security(dir, inode, &dentry->d_name);
>> Â Â Â return 0;
>>
>> Âout_cancel:
>
> The ubifs_init_security() should occur before d_instantiate() so that
> the inode is not accessible to other threads before its security
> attributes have been set. ÂAnd if it fails, you would ideally drop the
> inode altogether and return an error to the creating process.
>

I will look into moving ubifs_init_security() before d_instantiate().
Last time I had tried I had run into some issues and had to keep
creating inode and then creating xattr as two seperate items. I will
look through the UBIFS code that actually creates xattr ubi nodes.
Also I will wait for couple of days to send v3 patch with to see if
mtd folks have other comments this patch.

Regards,
-Subodh
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