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Message-ID: <20150321213825.GK16260@port70.net>
Date: Sat, 21 Mar 2015 22:38:25 +0100
From: Szabolcs Nagy <nsz@...t70.net>
To: Konstantin Serebryany <konstantin.s.serebryany@...il.com>,
Rich Felker <dalias@...c.org>, musl@...ts.openwall.com
Subject: Re: buffer overflow in regcomp and a way to find more of those
* Szabolcs Nagy <nsz@...t70.net> [2015-03-21 22:03:02 +0100]:
...
> r12 0x10 16
> r13 0x7 7
> r14 0x6e2dc3 7220675
> r15 0x1 1
> rip 0x47a05b 0x47a05b <inet_pton+1307>
> eflags 0x10202 [ IF RF ]
> cs 0x33 51
> ss 0x2b 43
> ds 0x0 0
> es 0x0 0
> fs 0x63 99
> gs 0x0 0
> (gdb) p (char*)0x6e2dc3
> $3 = 0x6e2dc3 "2.8288;3:33::2.82.83333"
> (gdb)
ah.. r14 is incremented as the string is parsed
the original string is
(gdb) p (char*)0x6e2dc3-35
$37 = 0x6e2da0 "8:a:2:8:3:28:8::2:83:20:8:2:833:23:2.8288;3:33::2.82.83333"
with this i can reproduce the crash
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