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Message-ID: <20130128210901.GA10520@openwall.com>
Date: Tue, 29 Jan 2013 01:09:01 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: dmg2john
Dhiru, Milen -
dmg2john is in bad shape now. Here are some issues:
1. It's not being built by default. "make dmg2john" builds it, but this
should be made the default.
2. It's not integrated into "john", to be similar with other *2john
tools. It becomes a separate binary executable. Perhaps we need to
integrate it, since it has no dependencies on extra libs.
3. The return values from lseek() are not checked. They must be!
4. The return values from read() are either not checked or are checked
incorrectly. "<= 0" is not it. read() may also return with partial
data. We need to use a read_loop() function (see popa3d), or at the
very least detect the partial reads and refuse to work if so.
Alternatively, we may switch to using "FILE *" and the f*() functions.
5. As also spotted by Milen:
<@gat3way> @jmgosney @jeremiahg @DhiruKholia @solardiz Hm I think I found the problem....cno = ceil(header2.datasize / 4096.0) - 2; cno is int
We must not do any floating-point math. When header2.datasize is large,
there may be precision loss here, and the resulting value may be other
than what we expect. We should express this without resorting to
floating-point intermediate values:
cno = (header2.datasize + 4095) / 4096 - 2;
Milen - is this what you meant, too?
Thanks,
Alexander
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