linux-kernel - Re: [PATCH 2/2] apparmor: Fully initialize aa_perms struct when answering userspace query

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Message-ID: <20180710150358.GD1661@mail.hallyn.com>
Date:   Tue, 10 Jul 2018 10:03:58 -0500
From:   "Serge E. Hallyn" <serge@...lyn.com>
To:     Tyler Hicks <tyhicks@...onical.com>
Cc:     John Johansen <john.johansen@...onical.com>,
        James Morris <jmorris@...ei.org>,
        Serge Hallyn <serge@...lyn.com>,
        Seth Arnold <seth.arnold@...onical.com>,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] apparmor: Fully initialize aa_perms struct when
 answering userspace query

Quoting Tyler Hicks (tyhicks@...onical.com):
> Fully initialize the aa_perms struct in profile_query_cb() to avoid the
> potential of using an uninitialized struct member's value in a response
> to a query from userspace.
> 
> Detected by CoverityScan CID#1415126 ("Uninitialized scalar variable")
> 
> Fixes: 4f3b3f2d79a4 ("apparmor: add profile permission query ability")
> Signed-off-by: Tyler Hicks <tyhicks@...onical.com>

Acked-by: Serge Hallyn <serge@...lyn.com>

> ---
>  security/apparmor/apparmorfs.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
> index 949dd8a48164..e09fe4d7307c 100644
> --- a/security/apparmor/apparmorfs.c
> +++ b/security/apparmor/apparmorfs.c
> @@ -603,7 +603,7 @@ static const struct file_operations aa_fs_ns_revision_fops = {
>  static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
>  			     const char *match_str, size_t match_len)
>  {
> -	struct aa_perms tmp;
> +	struct aa_perms tmp = { };
>  	struct aa_dfa *dfa;
>  	unsigned int state = 0;
>  
> @@ -613,7 +613,6 @@ static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
>  		dfa = profile->file.dfa;
>  		state = aa_dfa_match_len(dfa, profile->file.start,
>  					 match_str + 1, match_len - 1);
> -		tmp = nullperms;
>  		if (state) {
>  			struct path_cond cond = { };
>  
> @@ -627,8 +626,6 @@ static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
>  					 match_str, match_len);
>  		if (state)
>  			aa_compute_perms(dfa, state, &tmp);
> -		else
> -			tmp = nullperms;
>  	}
>  	aa_apply_modes_to_perms(profile, &tmp);
>  	aa_perms_accum_raw(perms, &tmp);
> -- 
> 2.7.4