linux-kernel - Re: [Patch 1/2] selinux: ajust rules for ATTR

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Date:	Tue, 18 Aug 2009 16:46:29 +0800
From:	Amerigo Wang <amwang@...hat.com>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
CC:	Stephen Smalley <sds@...ho.nsa.gov>, linux-kernel@...r.kernel.org,
	esandeen@...hat.com, eteo@...hat.com, eparis@...hat.com,
	linux-fsdevel@...r.kernel.org, akpm@...ux-foundation.org,
	viro@...iv.linux.org.uk
Subject: Re: [Patch 1/2] selinux: ajust rules for ATTR_FORCE

OGAWA Hirofumi wrote:
> [Sorry if this killed thread. My ISP seems to be stopping email server
> now. I've read this email from web archive.]
>
>   
>>> @@ -2711,12 +2711,17 @@ static int selinux_inode_permission(stru
>>>  static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)
>>>  {
>>>  	const struct cred *cred = current_cred();
>>> +	unsigned int ia_valid = iattr->ia_valid;
>>>  
>>> -	if (iattr->ia_valid & ATTR_FORCE)
>>> -		return 0;
>>> +	/* ATTR_FORCE is just used for ATTR_KILL_S[UG]ID. */
>>> +	if (ia_valid & ATTR_FORCE) {
>>> +		ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_MODE);
>>> +		if (!ia_valid)
>>> +			return 0;
>>>   
>>>       
>> So if I read this correctly, (ATTR_FORCE| ATTR_KILL_SUID|ATTR_MODE) will 
>> not return here, since 'ia_valid' will be ATTR_FORCE finally.
>>
>> I think you forgot to clear ATTR_FORCE here...
>>     
>
> Whoops, good catch. Fortunately, it doesn't seem to have actual problem,
> but it's bug obviously, and sorry for that. Fixed patch was attached.
>   

This version looks OK for me! Stephen, any objections?

Thank you!

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