linux-kernel - Re: [PATCH 22/43] userns: Convert capabilities related permsion checks

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Date:	Fri, 20 Apr 2012 16:18:50 -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 22/43] userns: Convert capabilities related permsion checks

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

> Quoting Eric W. Beiderman (ebiederm@...ssion.com):
>> From: Eric W. Biederman <ebiederm@...ssion.com>
>> 
>> - Use uid_eq when comparing kuids
>>   Use gid_eq when comparing kgids
>> - Use __make_kuid(user_ns, 0) to talk about the user_namespace root uid
>>   Use __make_kgid(user_ns, 0) to talk about the user_namespace root gid
>> 
>> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
>
> Acked-by: Serge Hallyn <serge.hallyn@...onical.com>
>
> though, nit,
>
>> ---
>>  fs/open.c            |    3 ++-
>>  security/commoncap.c |   43 ++++++++++++++++++++++++++++---------------
>>  2 files changed, 30 insertions(+), 16 deletions(-)
>> 

>> diff --git a/security/commoncap.c b/security/commoncap.c
>> index dbd465a..9bf8df8 100644
>> --- a/security/commoncap.c
>> +++ b/security/commoncap.c
>> @@ -472,19 +472,24 @@ int cap_bprm_set_creds(struct linux_binprm *bprm)
>>  	struct cred *new = bprm->cred;
>>  	bool effective, has_cap = false;
>>  	int ret;
>> +	kuid_t root_uid;
>> +	kgid_t root_gid;
>
> the root_gid is assigned but never used.

Thanks snipped.  It doesn't look like there will ever be a use for it.

>>  
>>  	effective = false;
>>  	ret = get_file_caps(bprm, &effective, &has_cap);
>>  	if (ret < 0)
>>  		return ret;
>>  
>> +	root_uid = make_kuid(new->user_ns, 0);
>> +	root_gid = make_kgid(new->user_ns, 0);
>> +

Eric
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