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From: Dominik Brodowski <linux@dominikbrodowski.net>
To: Christian Brauner <christian@brauner.io>
Cc: akpm@linux-foundation.org, keescook@chromium.org,
	linux-kernel@vger.kernel.org, ebiederm@xmission.com,
	mcgrof@kernel.org, joe.lawrence@redhat.com, longman@redhat.com,
	viro@zeniv.linux.org.uk, adobriyan@gmail.com,
	linux-api@vger.kernel.org
Subject: Re: [RESEND PATCH v3 2/2] sysctl: handle overflow for file-max
Date: Tue, 8 Jan 2019 08:01:10 +0100
Message-ID: <20190108070110.GA7998@light.dominikbrodowski.net> (raw)
In-Reply-To: <20190107222700.15954-3-christian@brauner.io>

On Mon, Jan 07, 2019 at 11:27:00PM +0100, Christian Brauner wrote:
> @@ -2833,6 +2836,10 @@ static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int
>  				break;
>  			if (neg)
>  				continue;
> +			if ((max && val > *max) || (min && val < *min)) {
> +				err = -EINVAL;
> +				break;
> +			}
>  			val = convmul * val / convdiv;
>  			if ((min && val < *min) || (max && val > *max))
>  				continue;

This is a generic change which affects all users of
do_proc_doulongvec_minmax() that have extra1 or extra2 set. In sysctl.c, I
do not see another user of proc_doulongvec_minmax() that has extra1 or
extra2 set. However, have you verified whether your patch changes the
behaviour for other files that make use of proc_doulongvec_minmax() or
proc_doulongvec_ms_jiffies_minmax(), and not only of the file-max sysctl?

Thanks,
	Dominik

  reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-07 22:26 [RESEND PATCH v3 0/2] " Christian Brauner
2019-01-07 22:26 ` [RESEND PATCH v3 1/2] sysctl: handle overflow in proc_get_long Christian Brauner
2019-01-07 22:27 ` [RESEND PATCH v3 2/2] sysctl: handle overflow for file-max Christian Brauner
2019-01-08  7:01   ` Dominik Brodowski [this message]
2019-01-10 14:50     ` Christian Brauner
2019-01-10 14:55       ` Dominik Brodowski
2019-01-10 15:00         ` Christian Brauner
2019-01-11 14:51         ` Christian Brauner
2019-01-07 23:16 ` [RESEND PATCH v3 0/2] " Kees Cook

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