netdev - Re: Possible issue in iproute2 package

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Date:	Thu, 28 May 2015 23:43:18 +0200
From:	Daniel Borkmann <daniel@...earbox.net>
To:	"Guzman Mosqueda, Jose R" <jose.r.guzman.mosqueda@...el.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"shemminger@...l.org" <shemminger@...l.org>, vadim4j@...il.com
Subject: Re: Possible issue in iproute2 package

Hi Jose,

thanks for your report!

On 05/28/2015 11:12 PM, Guzman Mosqueda, Jose R wrote:
...
> We're using iproute2 in a GNU-Linux project and I'm analyzing the code
> to try to find possible issues/gaps/risks.
> Since I'm not too familiar with the package yet I have a question about
> a particular piece of code that could result in a memory corruption:
>
> Version: 4.0.0
> File: misc/ss.c
> Function: static void tcp_show_info(...)
> Line: ~1903
> Description: There is a memory allocation for a "s.cong_alg" variable:
> s.cong_alg = malloc(strlen(cong_attr + 1));
> The length is calculated about next position of the starting character.
> But next line there is a copy of the whole content:
> strcpy(s.cong_alg, cong_attr);
> I think there is a mistake and it should be something like:
> s.cong_alg = malloc(strlen(cong_attr) + 1);
> Is this the case? Is it a real bug?
> Also I don't see any checking for the value returned by the malloc call,
> what if it returns a NULL pointer?

Cc'ing Vadim for ...

commit 8250bc9ff4e55a3ef397ed8c7612f1392d164295
Author: Vadim Kochan <vadim4j@...il.com>
Date:   Tue Jan 20 16:14:24 2015 +0200

     ss: Unify inet sockets output

     Signed-off-by: Vadim Kochan <vadim4j@...il.com>

> Also I found something similar about line 1903:
> s.cong_alg = malloc(strlen(cong_attr + 1));
> strcpy(s.cong_alg, cong_attr);
>
> And another possible issue that I found:
>
> File: tc/tc_util.c
> Function: void print_rate(char *buf, int len, __u64 rate)
> Line: ~264
>
> In the case that user inputs a high value for rate, the "for" loop will
> exit in the condition meaning that variable "i" get the value of 5 which
> will be an invalid index for the "units" array due to that array has
> only 5 elements.
>
> I hope you can help me by checking these issues and tell me whether they
> are real issues or not since you know much better the code.
> Also I don't know if you have already this reported, I didn't find a
> list of issues for this package. Can you tell me where is such list?
>
> I really appreciate any help on this.
>
> Thanks in advance.
> Jose G.
>
>
>
>
>
>
>
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>

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