[radvd-devel-l] ensure null-termination, enhance radvdump

Pekka Savola radvd-devel-l@litech.org
Wed, 2 Jan 2002 21:22:16 +0200 (EET) 

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--1589707168-1110231881-1009974280=:25274
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Content-ID: <Pine.LNX.4.33.0201021424451.25274@netcore.fi>

Hello all,

Attached are latest changes:

1) with strncpy, ensure the strings are always NULL-terminated.  Sigh, I 
so miss strlcpy.  The problem is that with:

strncpy(ifr.ifr_name, ifn, IFNAMSIZ-1);

ifr.ifr_name[IFNAMSIZ-1] will be left uninitialized (or what it was before 
copying).

However, the user cannot "reach this" (as strncpy does not copy up to it),
or the memory segments after strncpy'ies in question, so I don't think it
could be in practise be exploited.  Some crashes when using too long
interface names might be more likely.

But all in all, it's better be safe than sorry :-).

2) Marko Myllynen (and some bits from me) have enhanced radvdump; it's now 
possible to do 'radvdump -f -e', where -e flag omits all default options 
from heard advertisements, making the configuration file which will be 
shown a lot more readable.

Comments welcome, as always.

-- 
Pekka Savola                 "Tell me of difficulties surmounted,
Netcore Oy                   not those you stumble over and fall"
Systems. Networks. Security.  -- Robert Jordan: A Crown of Swords

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