From: Mimi Zohar <zohar@linux.ibm.com>
To: Joe Perches <joe@perches.com>,
Colin King <colin.king@canonical.com>,
Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
James Morris <jmorris@namei.org>,
"Serge E . Hallyn" <serge@hallyn.com>,
Roberto Sassu <roberto.sassu@polito.it>,
linux-integrity@vger.kernel.org,
linux-security-module@vger.kernel.org
Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] ima: Fix sizeof mismatches
Date: Mon, 12 Oct 2020 17:51:11 +0000 [thread overview]
Message-ID: <a9a35d8b480112fe40b45392d0f0e9dcb5be536e.camel@linux.ibm.com> (raw)
In-Reply-To: <55ae0b6152c84013d483b1bbecb28a425801c408.camel@perches.com>
On Wed, 2020-10-07 at 11:27 -0700, Joe Perches wrote:
> On Wed, 2020-10-07 at 12:02 +0100, Colin King wrote:
> > An incorrect sizeof is being used, sizeof(*fields) is not correct,
> > it should be sizeof(**fields). This is not causing a problem since
> > the size of these is the same. Fix this in the kmalloc_array and
> > memcpy calls.
> []
> > diff --git a/security/integrity/ima/ima_template.c b/security/integrity/ima/ima_template.c
> []
> > @@ -216,11 +216,11 @@ int template_desc_init_fields(const char *template_fmt,
> > }
> >
> > if (fields && num_fields) {
> > - *fields = kmalloc_array(i, sizeof(*fields), GFP_KERNEL);
> > + *fields = kmalloc_array(i, sizeof(**fields), GFP_KERNEL);
> > if (*fields = NULL)
> > return -ENOMEM;
> >
> > - memcpy(*fields, found_fields, i * sizeof(*fields));
> > + memcpy(*fields, found_fields, i * sizeof(**fields));
>
> Maybe use kmemdup instead.
>
> if (fields && num_fields) {
> *fields = kmemdup(found_fields, i * sizeof(**fields), GFP_KERNEL);
> etc...
>
Thanks, Joe. Since this patch will be backported, perhaps it would be
better to leave this as a bug fix and upstream other changes
independently.
Mimi
next prev parent reply other threads:[~2020-10-12 17:51 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-07 11:02 [PATCH] ima: Fix sizeof mismatches Colin King
2020-10-07 12:38 ` Roberto Sassu
2020-10-07 16:49 ` Jarkko Sakkinen
2020-10-07 18:27 ` Joe Perches
2020-10-12 17:51 ` Mimi Zohar [this message]
2020-10-12 18:06 ` Joe Perches
2020-10-12 18:10 ` Colin Ian King
2020-10-13 16:17 ` Mimi Zohar
2020-10-13 16:23 ` Colin Ian King
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