From: Ulrich Drepper <drepper@gmail.com>
To: linux-kernel@vger.kernel.org
Subject: Re: short read from /dev/urandom
Date: Thu, 13 Jan 2005 22:54:13 -0800 [thread overview]
Message-ID: <a36005b50501132254155a0d5a@mail.gmail.com> (raw)
In-Reply-To: <cs7mup$hgo$1@abraham.cs.berkeley.edu>
On Fri, 14 Jan 2005 05:56:41 +0000 (UTC), David Wagner
<daw@taverner.cs.berkeley.edu> wrote:
> True. Arguably, the solution is to fix the documentation.
The problem is that no-short-reads behavior has been documented for a
long time and so programs might, correctly so, use
while (read(fd, buf, sizeof buf) == -1)
continue;
Image a program doing this. It provides the possibility for a local
attack. If one can determine the content of the to-be-filled buffer
before the 'read', then an attacker could limit the randomness in the
buffer after the read by sending signals to the program.
Not breaking the ABI is more important than symmetry.
next prev parent reply other threads:[~2005-01-14 6:54 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-14 4:54 short read from /dev/urandom Ulrich Drepper
2005-01-14 5:56 ` David Wagner
2005-01-14 6:54 ` Ulrich Drepper [this message]
2005-01-14 19:55 ` David Wagner
2005-01-14 19:10 ` Theodore Ts'o
2005-01-14 21:04 ` Ulrich Drepper
2005-01-14 23:21 ` Theodore Ts'o
2005-01-15 2:36 ` H. Peter Anvin
2005-01-16 2:51 ` Matt Mackall
2005-01-16 3:18 ` H. Peter Anvin
2005-01-15 2:34 ` H. Peter Anvin
2005-01-19 15:48 ` Pavel Machek
2005-01-16 2:44 ` Matt Mackall
2005-01-16 3:58 ` Ulrich Drepper
2005-01-16 4:58 ` Matt Mackall
2005-01-16 13:23 ` Andries Brouwer
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