linux-kernel - Re: [PATCH 2/3] trusted-keys: check hex2bin result

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Message-ID: <CAHp75VdUsefaFJYR07UCDG74yb03pbxWKO81PanmfK_yWt4y=g@mail.gmail.com>
Date:	Tue, 20 Sep 2011 16:57:36 +0300
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	linux-security-module@...r.kernel.org,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	James Morris <jmorris@...ei.org>,
	David Safford <safford@...son.ibm.com>
Subject: Re: [PATCH 2/3] trusted-keys: check hex2bin result

On Tue, Sep 20, 2011 at 4:15 PM, Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:
> From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
>
> For each hex2bin call in trusted keys, check that the ascii hex string is
> valid.  On failure, return -EINVAL.
>
> Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> Signed-off-by: Mimi Zohar <zohar@...ux.vnet.ibm.com>
> ---
>  security/keys/trusted.c |   15 +++++++++++----
>  1 files changed, 11 insertions(+), 4 deletions(-)
>
> diff --git a/security/keys/trusted.c b/security/keys/trusted.c
> index 0c33e2e..9b847e1 100644
> --- a/security/keys/trusted.c
> +++ b/security/keys/trusted.c
> @@ -779,7 +779,9 @@ static int getoptions(char *c, struct trusted_key_payload *pay,
>                        opt->pcrinfo_len = strlen(args[0].from) / 2;
>                        if (opt->pcrinfo_len > MAX_PCRINFO_SIZE)
>                                return -EINVAL;
> -                       hex2bin(opt->pcrinfo, args[0].from, opt->pcrinfo_len);
> +                       if (!hex2bin(opt->pcrinfo, args[0].from,
> +                                    opt->pcrinfo_len))
> +                               return -EINVAL;
if (hex2bin(...) < 0)

Everywhere in Patch 2 and 3.

-- 
With Best Regards,
Andy Shevchenko
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