From: Dan Carpenter <error27@gmail.com>
To: nelhage@ksplice.com
Cc: Eric Dumazet <eric.dumazet@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Robert Olsson <robert.olsson@its.uu.se>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
netdev@vger.kernel.org
Subject: Re: [patch] fix stack overflow in pktgen_if_write()
Date: Thu, 28 Oct 2010 00:40:57 +0200 [thread overview]
Message-ID: <20101027224057.GP6062@bicker> (raw)
In-Reply-To: <20101027221234.GN6062@bicker>
On Thu, Oct 28, 2010 at 12:12:35AM +0200, Dan Carpenter wrote:
> - char tb[count + 1];
> - if (copy_from_user(tb, user_buffer, count))
> - return -EFAULT;
> - tb[count] = 0;
> + char *tb;
> +
> + tb = strndup_user(user_buffer, count + 1);
Crap... This should be memdup_user().
Sorry about that. I'll send v2.
regards,
dan carpenter
> + if (IS_ERR(tb))
> + return PTR_ERR(tb);
> printk(KERN_DEBUG "pktgen: %s,%lu buffer -:%s:-\n", name,
> (unsigned long)count, tb);
> + kfree(tb);
> }
>
> if (!strcmp(name, "min_pkt_size")) {
next prev parent reply other threads:[~2010-10-27 22:41 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-27 19:13 [PATCH] pktgen: Remove a dangerous debug print Nelson Elhage
2010-10-27 19:21 ` David Miller
2010-10-27 19:28 ` Nelson Elhage
2010-10-27 19:30 ` David Miller
2010-10-27 19:41 ` Eric Dumazet
2010-10-27 19:49 ` Nelson Elhage
2010-10-27 20:38 ` Ben Greear
2010-10-27 22:12 ` [patch] fix stack overflow in pktgen_if_write() Dan Carpenter
2010-10-27 22:40 ` Dan Carpenter [this message]
2010-10-27 22:43 ` [patch v2] " Dan Carpenter
2010-10-27 23:06 ` Nelson Elhage
2010-10-28 6:05 ` Dan Carpenter
2010-10-28 6:05 ` [patch v3] " Dan Carpenter
2010-10-28 15:22 ` Nelson Elhage
2010-10-28 16:28 ` Dan Carpenter
2010-10-28 16:30 ` Nelson Elhage
2010-10-28 23:11 ` Andi Kleen
2010-11-01 3:47 ` Dan Carpenter
2010-10-28 15:20 ` [PATCH] pktgen: Limit how much data we copy onto the stack Nelson Elhage
2010-10-28 18:32 ` David Miller
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