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Date: Thu, 17 Nov 2011 06:22:17 +0400
From: Solar Designer <solar@...nwall.com>
To: oss-security@...ts.openwall.com
Subject: Re: glibc crypt(3), crypt_r(3), PHP crypt() may use alloca()
On Tue, Nov 15, 2011 at 06:13:24AM +0400, Solar Designer wrote:
> Alternatively, crypt(3) and crypt_r(3) (and the reference code for
> SHA-crypt?) could refuse to work on overly long key or/and salt strings,
> but then the question is what they should do on error.
Here's another related option:
if (strlen(key) > 100000 || strlen(salt) > 100000)
abort();
(or something like this). Ridiculous? Sure, but it's better than
overwriting another thread's stack or the heap with somewhat higher
lengths, and 100001 chars is not a more reasonable password length to
support than, say, 2 million or 10 million (typical thread stack sizes).
So if we can't decide on a proper fix (does anyone besides me even
care?), something as trivial as the above would be an improvement.
Alexander
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