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] [thread-next>] [day] [month] [year] [list]
Message-Id: <20141026.220350.2098346782596904995.davem@davemloft.net>
Date:	Sun, 26 Oct 2014 22:03:50 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	sasha.levin@...cle.com
Cc:	a.ryabinin@...sung.com, pablo@...filter.org, mschmidt@...hat.com,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] netlink: don't copy over empty attribute data

From: Sasha Levin <sasha.levin@...cle.com>
Date: Sun, 26 Oct 2014 19:32:42 -0400

> How so? GCC states clearly that you should *never* pass a NULL
> pointer there:
> 
> "The pointers passed to memmove (and similar functions in <string.h>) must
> be non-null even when nbytes==0" (https://gcc.gnu.org/gcc-4.9/porting_to.html).
> 
> Even if it doesn't dereference it, it can break somehow in a subtle way. Leaving
> the kernel code assuming that gcc (or any other compiler) would always behave
> the same in a situation that shouldn't occur.

Show me a legal way in which one could legally dereference the pointer
when length is zero, and I'll entertain this patch.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ