linux-kernel - Re: [PATCH 3/5] selinux: use consistent pointer types for boolean arrays

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Message-ID: <CAHC9VhQPZ3_dXvM9eqwsxZ2c+2mcdvNNJbtUNs_-9Md5F3P8vA@mail.gmail.com>
Date:   Fri, 18 Feb 2022 11:01:10 -0500
From:   Paul Moore <paul@...l-moore.com>
To:     Christian Göttsche <cgzones@...glemail.com>
Cc:     selinux@...r.kernel.org,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        Eric Paris <eparis@...isplace.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Ondrej Mosnacek <omosnace@...hat.com>,
        James Morris <jamorris@...ux.microsoft.com>,
        Austin Kim <austin.kim@....com>,
        Casey Schaufler <casey@...aufler-ca.com>,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
        Yang Li <yang.lee@...ux.alibaba.com>,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH 3/5] selinux: use consistent pointer types for boolean arrays

On Thu, Feb 17, 2022 at 9:21 AM Christian Göttsche
<cgzones@...glemail.com> wrote:
>
> Use a consistent type of unsigned int* for boolean arrays, instead of
> using implicit casts to and from int*.
>
> Reported by sparse:
>
>     security/selinux/selinuxfs.c:1481:30: warning: incorrect type in assignment (different signedness)
>     security/selinux/selinuxfs.c:1481:30:    expected unsigned int *
>     security/selinux/selinuxfs.c:1481:30:    got int *[addressable] values
>     security/selinux/selinuxfs.c:1398:48: warning: incorrect type in argument 3 (different signedness)
>     security/selinux/selinuxfs.c:1398:48:    expected int *values
>     security/selinux/selinuxfs.c:1398:48:    got unsigned int *bool_pending_values
>
> Signed-off-by: Christian Göttsche <cgzones@...glemail.com>
>
> ---
> A more invasive change would be to change all boolean arrays to bool*.

I think that might be a worthwhile change, although that can happen at
a later date.

A quick general comment: please try to stick to 80-char long lines.  I
realize Linus/checkpatch.pl has started to allow longer lines but I
would still like SELinux to try and keep to 80-chars or under.

> diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
> index 6901dc07680d..7865926962ab 100644
> --- a/security/selinux/ss/services.c
> +++ b/security/selinux/ss/services.c
> @@ -3175,7 +3175,8 @@ int security_get_bool_value(struct selinux_state *state,
>  static int security_preserve_bools(struct selinux_policy *oldpolicy,
>                                 struct selinux_policy *newpolicy)
>  {
> -       int rc, *bvalues = NULL;
> +       int rc;
> +       unsigned int *bvalues = NULL;

Doesn't this cause a type mismatch (unsigned int vs int) when an entry
from bvalues[] is assigned to cond_bool_datum::state later in the
security_preserve_bools() function?

-- 
paul-moore.com