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Message-ID: <20180308183721.mnsrmhekyfo2dbso@smitten>
Date: Thu, 8 Mar 2018 11:37:21 -0700
From: Tycho Andersen <tycho@...ho.ws>
To: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: Mimi Zohar <zohar@...ux.vnet.ibm.com>,
Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
linux-integrity@...r.kernel.org,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH] ima: drop vla in ima_audit_measurement()
On Thu, Mar 08, 2018 at 07:47:37PM +0200, Andy Shevchenko wrote:
> On Thu, Mar 8, 2018 at 7:14 PM, Tycho Andersen <tycho@...ho.ws> wrote:
> > In keeping with the directive to get rid of VLAs [1], let's drop the VLA
> > from ima_audit_measurement(). We need to adjust the return type of
> > ima_audit_measurement, because now this function can fail if an allocation
> > fails.
>
>
>
> > + algo_hash_len = hash_len + strlen(algo_name) + 2;
> > + algo_hash = kzalloc(algo_hash_len, GFP_KERNEL);
>
> > - snprintf(algo_hash, sizeof(algo_hash), "%s:%s", algo_name, hash);
> > + snprintf(algo_hash, algo_hash_len, "%s:%s", algo_name, hash);
>
> kasprintf() ?
Sure, in fact I think we could just do:
- snprintf(algo_hash, algo_hash_len, "%s:%s", algo_name, hash);
- audit_log_untrustedstring(ab, algo_hash);
+ audit_log_untrustedstring(ab, algo_name);
+ audit_log_format(ab, ":");
+ audit_log_untrustedstring(ab, hash);
and get rid of the allocation entirely. I'll test and make sure it
works and then re-send.
Cheers,
Tycho
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