Date: Sat, 06 Mar 2004 21:31:51 +0100 From: des@des.no (Dag-Erling =?iso-8859-1?q?Sm=F8rgrav?=) To: Anthony Schneider <anthony@x-anthony.com> Cc: chungwei Hsiung <chsiung2@buffalo.edu> Subject: Re: Strange instructions in compiler output Message-ID: <xzpllmdu37s.fsf@dwp.des.no> In-Reply-To: <20040306202517.GA8384@x-anthony.com> (Anthony Schneider's message of "Sat, 6 Mar 2004 15:25:17 -0500") References: <4048CA38.6040203@yahoo.com> <20040305233209.GO67801@wantadilla.lemis.com> <20040306142651.314430be@bear.bflony.adelphia.net> <20040306202517.GA8384@x-anthony.com>
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Anthony Schneider <anthony@x-anthony.com> writes: > On Sat, Mar 06, 2004 at 02:26:51PM +0000, chungwei Hsiung wrote: > > gcc -o shellcode -ggdb -static shellcode.c > try compiling with the -static flag the gcc. Reading is fast becoming a lost art... Anyway, here's the code for execve(): 08048224 <__sys_execve>: 8048224: b8 3b 00 00 00 mov $0x3b,%eax 8048229: cd 80 int $0x80 804822b: 72 ef jb 804821c <main+0x3c> 804822d: c3 ret 804822e: 90 nop 804822f: 90 nop exciting, huh? oh, and the code that calls it: 8048201: 6a 00 push $0x0 8048203: 8d 45 f8 lea 0xfffffff8(%ebp),%eax 8048206: 50 push %eax 8048207: ff 75 f8 pushl 0xfffffff8(%ebp) 804820a: e8 15 00 00 00 call 8048224 <__sys_execve> 804820f: 83 c4 10 add $0x10,%esp DES --=20 Dag-Erling Sm=F8rgrav - des@des.no
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