From: walter harms <wharms@bfs.de>
To: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Mauro Carvalho Chehab <mchehab@redhat.com>,
linux-media@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: Re: [patch] [media] media: info leak in media_device_enum_entities()
Date: Sun, 21 Apr 2013 11:51:56 +0000 [thread overview]
Message-ID: <5173D2DC.4060200@bfs.de> (raw)
In-Reply-To: <20130421111003.GD6171@elgon.mountain>
Am 21.04.2013 13:10, schrieb Dan Carpenter:
> The last part of the "u_ent.name" buffer isn't cleared so it still has
> uninitialized stack memory.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>
> diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
> index 99b80b6..1957c0d 100644
> --- a/drivers/media/media-device.c
> +++ b/drivers/media/media-device.c
> @@ -102,9 +102,12 @@ static long media_device_enum_entities(struct media_device *mdev,
> return -EINVAL;
>
> u_ent.id = ent->id;
> - u_ent.name[0] = '\0';
> - if (ent->name)
> - strlcpy(u_ent.name, ent->name, sizeof(u_ent.name));
> + if (ent->name) {
> + strncpy(u_ent.name, ent->name, sizeof(u_ent.name));
> + u_ent.name[sizeof(u_ent.name) - 1] = '\0';
> + } else {
> + memset(u_ent.name, 0, sizeof(u_ent.name));
> + }
I would always memset()
and then do strncpy() for sizeof(u_ent.name) - 1
the rest is always zero.
re,
wh
> u_ent.type = ent->type;
> u_ent.revision = ent->revision;
> u_ent.flags = ent->flags;
> --
> To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
WARNING: multiple messages have this Message-ID (diff)
From: walter harms <wharms@bfs.de>
To: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Mauro Carvalho Chehab <mchehab@redhat.com>,
linux-media@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: Re: [patch] [media] media: info leak in media_device_enum_entities()
Date: Sun, 21 Apr 2013 13:51:56 +0200 [thread overview]
Message-ID: <5173D2DC.4060200@bfs.de> (raw)
In-Reply-To: <20130421111003.GD6171@elgon.mountain>
Am 21.04.2013 13:10, schrieb Dan Carpenter:
> The last part of the "u_ent.name" buffer isn't cleared so it still has
> uninitialized stack memory.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>
> diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
> index 99b80b6..1957c0d 100644
> --- a/drivers/media/media-device.c
> +++ b/drivers/media/media-device.c
> @@ -102,9 +102,12 @@ static long media_device_enum_entities(struct media_device *mdev,
> return -EINVAL;
>
> u_ent.id = ent->id;
> - u_ent.name[0] = '\0';
> - if (ent->name)
> - strlcpy(u_ent.name, ent->name, sizeof(u_ent.name));
> + if (ent->name) {
> + strncpy(u_ent.name, ent->name, sizeof(u_ent.name));
> + u_ent.name[sizeof(u_ent.name) - 1] = '\0';
> + } else {
> + memset(u_ent.name, 0, sizeof(u_ent.name));
> + }
I would always memset()
and then do strncpy() for sizeof(u_ent.name) - 1
the rest is always zero.
re,
wh
> u_ent.type = ent->type;
> u_ent.revision = ent->revision;
> u_ent.flags = ent->flags;
> --
> To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
next prev parent reply other threads:[~2013-04-21 11:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-21 11:10 [patch] [media] media: info leak in media_device_enum_entities() Dan Carpenter
2013-04-21 11:10 ` Dan Carpenter
2013-04-21 11:51 ` walter harms [this message]
2013-04-21 11:51 ` walter harms
2013-04-21 16:42 ` Dan Carpenter
2013-04-21 16:42 ` Dan Carpenter
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