linux-kernel - Re: [PATCH 27/43] userns: Use uid_eq gid_eq helpers when comparing kuids and kgids in the vfs

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Date:	Fri, 20 Apr 2012 17:05:56 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Serge E. Hallyn" <serge@...lyn.com>
Cc:	linux-kernel@...r.kernel.org,
	Linux Containers <containers@...ts.linux-foundation.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	linux-security-module@...r.kernel.org,
	Al Viro <viro@...IV.linux.org.uk>,
	linux-fsdevel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 27/43] userns: Use uid_eq gid_eq helpers when comparing kuids and kgids in the vfs

"Serge E. Hallyn" <serge@...lyn.com> writes:

> Quoting Eric W. Beiderman (ebiederm@...ssion.com):
>> From: Eric W. Biederman <ebiederm@...ssion.com>
>> 
>> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
>> ---
>>  fs/attr.c                |    8 ++++----
>>  fs/exec.c                |   10 +++++-----
>>  fs/fcntl.c               |    6 +++---
>>  fs/ioprio.c              |    4 ++--
>>  fs/locks.c               |    2 +-
>>  fs/namei.c               |    8 ++++----
>>  include/linux/quotaops.h |    4 ++--
>>  7 files changed, 21 insertions(+), 21 deletions(-)
>> 
>> diff --git a/fs/attr.c b/fs/attr.c
>> index 73f69a6..2f094c6 100644
>> --- a/fs/attr.c
>> +++ b/fs/attr.c
>> @@ -47,14 +47,14 @@ int inode_change_ok(const struct inode *inode, struct iattr *attr)
>>  
>>  	/* Make sure a caller can chown. */
>>  	if ((ia_valid & ATTR_UID) &&
>> -	    (current_fsuid() != inode->i_uid ||
>> -	     attr->ia_uid != inode->i_uid) && !capable(CAP_CHOWN))
>> +	    (!uid_eq(current_fsuid(), inode->i_uid) ||
>> +	     !uid_eq(attr->ia_uid, inode->i_uid)) && !capable(CAP_CHOWN))
>>  		return -EPERM;
>>  
>>  	/* Make sure caller can chgrp. */
>>  	if ((ia_valid & ATTR_GID) &&
>> -	    (current_fsuid() != inode->i_uid ||
>> -	    (!in_group_p(attr->ia_gid) && attr->ia_gid != inode->i_gid)) &&
>> +	    (!uid_eq(current_fsuid(), inode->i_uid) ||
>> +	    (!in_group_p(attr->ia_gid) && gid_eq(attr->ia_gid, inode->i_gid))) &&
>
> This should be !gid_eq() ?

Yes.  Thank you, it is now fixed in my tree.

Eric
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