linux-kernel - Re: [PATCH 39/46] selinux: Move two assignments for the variable "rc" in ocontext

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: <CAHC9VhStnBYKyiY8__7C-txRMj=XqLkDDmvhMdUkr9qnpyrA1A@mail.gmail.com>
Date:   Wed, 29 Mar 2017 11:38:32 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:     linux-security-module@...r.kernel.org, selinux@...ho.nsa.gov,
        Eric Paris <eparis@...isplace.org>,
        James Morris <james.l.morris@...cle.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        William Roberts <william.c.roberts@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 39/46] selinux: Move two assignments for the variable "rc"
 in ocontext_read()

On Sun, Jan 15, 2017 at 10:39 AM, SF Markus Elfring
<elfring@...rs.sourceforge.net> wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sun, 15 Jan 2017 11:30:12 +0100
>
> One local variable was set to an error code in two cases before
> a concrete error situation was detected. Thus move the corresponding
> assignments into if branches to indicate a software failure there.
>
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  security/selinux/ss/policydb.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)

Dropped as previously discussed.

> diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
> index 88730b372277..8b9ed3f1b132 100644
> --- a/security/selinux/ss/policydb.c
> +++ b/security/selinux/ss/policydb.c
> @@ -2121,10 +2121,11 @@ static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
>
>                 l = NULL;
>                 for (j = 0; j < nel; j++) {
> -                       rc = -ENOMEM;
>                         c = kzalloc(sizeof(*c), GFP_KERNEL);
> -                       if (!c)
> +                       if (!c) {
> +                               rc = -ENOMEM;
>                                 goto out;
> +                       }
>                         if (l)
>                                 l->next = c;
>                         else
> @@ -2186,13 +2187,13 @@ static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
>                                 if (rc)
>                                         goto out;
>
> -                               rc = -EINVAL;
>                                 c->v.behavior = le32_to_cpu(buf[0]);
>                                 /* Determined at runtime, not in policy DB. */
> -                               if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
> -                                       goto out;
> -                               if (c->v.behavior > SECURITY_FS_USE_MAX)
> +                               if (c->v.behavior == SECURITY_FS_USE_MNTPOINT ||
> +                                   c->v.behavior > SECURITY_FS_USE_MAX) {
> +                                       rc = -EINVAL;
>                                         goto out;
> +                               }
>
>                                 len = le32_to_cpu(buf[1]);
>                                 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
> --
> 2.11.0
>



-- 
paul moore
www.paul-moore.com