linux-kernel - Re: [PATCH v2 1/2] capabilities: Ambient capabilities

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Message-ID: <CALCETrUGivM6Jafp5npznsoUZQX04vzS+xr4HED5J4EbYD2OwQ@mail.gmail.com>
Date:	Fri, 15 May 2015 05:03:27 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Lukasz Pawelczyk <l.pawelczyk@...sung.com>
Cc:	Andy Lutomirski <luto@...nel.org>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	Andrew Morton <akpm@...uxfoundation.org>,
	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	"Ted Ts'o" <tytso@....edu>, "Andrew G. Morgan" <morgan@...nel.org>,
	Linux API <linux-api@...r.kernel.org>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Austin S Hemmelgarn <ahferroin7@...il.com>,
	linux-security-module <linux-security-module@...r.kernel.org>,
	Aaron Jones <aaronmdjones@...il.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Markku Savela <msa@...h.iki.fi>,
	Kees Cook <keescook@...omium.org>,
	Jonathan Corbet <corbet@....net>,
	Christoph Lameter <cl@...ux.com>
Subject: Re: [PATCH v2 1/2] capabilities: Ambient capabilities

On Fri, May 15, 2015 at 4:32 AM, Lukasz Pawelczyk
<l.pawelczyk@...sung.com> wrote:
> On czw, 2015-05-14 at 23:39 -0700, Andy Lutomirski wrote:
>> @@ -696,10 +729,18 @@ static inline void cap_emulate_setxuid(struct cred *new, const struct cred *old)
>>            uid_eq(old->suid, root_uid)) &&
>>           (!uid_eq(new->uid, root_uid) &&
>>            !uid_eq(new->euid, root_uid) &&
>> -          !uid_eq(new->suid, root_uid)) &&
>> -         !issecure(SECURE_KEEP_CAPS)) {
>> -             cap_clear(new->cap_permitted);
>> -             cap_clear(new->cap_effective);
>> +          !uid_eq(new->suid, root_uid))) {
>> +             if (!issecure(SECURE_KEEP_CAPS)) {
>> +                     cap_clear(new->cap_permitted);
>> +                     cap_clear(new->cap_effective);
>> +             }
>> +
>> +             /*
>> +              * Pre-ambient programs except setresuid to nonroot followed
>
> I think you meant "expect". This typo changes the meaning of the
> sentence.

Good catch.  I'll fix that for v3.

--Andy
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