linux-kernel - RE: [PATCH v2 6/6] ima: Fix return value of ima_write

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <cee0cd9d63864ed4a39422c6be818e36@huawei.com>
Date:   Wed, 29 Apr 2020 06:43:33 +0000
From:   Krzysztof Struczynski <krzysztof.struczynski@...wei.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>,
        Roberto Sassu <roberto.sassu@...wei.com>
CC:     "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Silviu Vlasceanu <Silviu.Vlasceanu@...wei.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH v2 6/6] ima: Fix return value of ima_write_policy()

Hi Mimi,

> -----Original Message-----
> From: Mimi Zohar [mailto:zohar@...ux.ibm.com]
> Sent: Tuesday, April 28, 2020 7:47 PM
> To: Roberto Sassu <roberto.sassu@...wei.com>; Krzysztof Struczynski
> <krzysztof.struczynski@...wei.com>
> Cc: linux-integrity@...r.kernel.org; linux-security-module@...r.kernel.org;
> linux-kernel@...r.kernel.org; Silviu Vlasceanu
> <Silviu.Vlasceanu@...wei.com>; Krzysztof Struczynski
> <krzysztof.struczynski@...wei.com>; stable@...r.kernel.org
> Subject: Re: [PATCH v2 6/6] ima: Fix return value of ima_write_policy()
> 
> Hi Roberto,
> 
> On Mon, 2020-04-27 at 12:31 +0200, Roberto Sassu wrote:
> > This patch fixes the return value of ima_write_policy() when a new
> > policy is directly passed to IMA and the current policy requires
> > appraisal of the file containing the policy. Currently, if appraisal
> > is not in ENFORCE mode,
> > ima_write_policy() returns 0 and leads user space applications to an
> > endless loop. Fix this issue by denying the operation regardless of
> > the appraisal mode.
> >
> > Changelog
> >
> > v1:
> > - deny the operation in all cases (suggested by Mimi, Krzysztof)
> 
> Relatively recently, people have moved away from including the "Changelog"
> in the upstream commit. (I'm removing them now.)
> 
> >
> > Cc: stable@...r.kernel.org # 4.10.x
> > Fixes: 19f8a84713edc ("ima: measure and appraise the IMA policy
> > itself")
> > Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
> 
> Without the Changelog, the only way of acknowledging people's contributions
> is by including their tags.  Krzysztof, did you want to add your "Reviewed-by"
> tag?

Please add:
Reviewed-by: Krzysztof Struczynski <krzysztof.struczynski@...wei.com>

Thanks,
Krzysztof

> 
> > ---
> 
> People have started putting the Changelog or any comments immediately
> below the separator "---" here.
> 
> thanks,
> 
> Mimi
> 
> >  security/integrity/ima/ima_fs.c | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> >
> > diff --git a/security/integrity/ima/ima_fs.c
> > b/security/integrity/ima/ima_fs.c index 8b030a1c5e0d..e3fcad871861
> > 100644
> > --- a/security/integrity/ima/ima_fs.c
> > +++ b/security/integrity/ima/ima_fs.c
> > @@ -338,8 +338,7 @@ static ssize_t ima_write_policy(struct file *file, const
> char __user *buf,
> >  		integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL,
> >  				    "policy_update", "signed policy required",
> >  				    1, 0);
> > -		if (ima_appraise & IMA_APPRAISE_ENFORCE)
> > -			result = -EACCES;
> > +		result = -EACCES;
> >  	} else {
> >  		result = ima_parse_add_rule(data);
> >  	}