linux-kernel - Re: [PATCH 2/8] char: hpet: fix information leak to userland

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Mon, 18 Oct 2010 17:10:20 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Vasiliy Kulikov <segooon@...il.com>
CC:	kernel-janitors@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/8] char: hpet: fix information leak to userland

Vasiliy Kulikov wrote:
> Structure info is copied to userland with some padding fields unitialized.
> It leads to leaking of stack memory.

> --- a/drivers/char/hpet.c
> +++ b/drivers/char/hpet.c
> @@ -581,6 +581,7 @@ hpet_ioctl_common(struct hpet_dev *devp, int cmd, unsigned long arg,
>  		break;
>  	case HPET_INFO:
>  		{
> +			memset(info, 0, sizeof(*info));
>  			if (devp->hd_ireqfreq)
>  				info->hi_ireqfreq =
>  					hpet_time_div(hpetp, devp->hd_ireqfreq);

This makes the following assignment "info->hi_ireqfreq = 0;" superfluous.


Regards,
Clemens
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/