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   [ÀÚÀÛ] ¿Ö Little Endian Àΰ¡ ?

http://www.hackerschool.org/HS_Boards/zboard.php?id=Free_Lectures&no=1971 [º¹»ç]


ÀÎÅͳݿ¡¼­ ½±°Ô ±¸ÇÒ ¼ö ÀÖ´Â Buffer OverFlow [BOF] '°­ÁÂ'¹®¼­µéÀ» º¸¸é

óÀ½°øºÎÇϽôºеéÀº ¹öÆÛ¿¡ ÀúÀåµÈ µ¥ÀÌÅÍ°ªÀÌ °Å²Ù·Î ¾²¿©ÀÖ´Â °ÍÀ» º¸°í »ý°¢ÇÕ´Ï´Ù.

' ÀÌ°Å ¸ÓÁö???¤Ð ¿Ö °Å²Ù·ÎÁö??¤Ð ±×³É ÆíÇÏ°Ô ¼ø¼­´ë·Î ¾²¸é ¾ÈµÇ³ª??¤Ð '

°Ë»ö or °­Á¿¡ ¼³¸íµÈ ³»¿ëÀ» ÅëÇØ little endian ¹æ½ÄÀ̱⶧¹®¿¡ ±×·¸´Ù´Â°ÍÀ» ¾Ë°ÔµË´Ï´Ù.



ÇÏÁö¸¸,

>> ¿Ö little endian¹æ½ÄÀ» »ç¿ëÇÏ´Â °Í Àϱî¿ä?? <<

¿¹¸¦ µé¾î, ¹öÆÛ¿¡ ÀúÀåµÉ µ¥ÀÌÅÍ°¡  0x00000037 À̶ó°í Çغ¾½Ã´Ù.

±×·³ Big Endian , Little Endian ¿¡ µû¶ó ´ÙÀ½°ú °°ÀÌ ÀúÀåµÇ°ÚÁÒ.

( ÁÖ¼Ò´Â ÀÓÀÇ·Î ¾´ °ÍÀÌ´Ï ½Å°æ¾²Áö¸¶¼¼¿ä. )

           Big Endian  - Data(µ¥ÀÌÅÍ)            Addr(ÁÖ¼Ò)          Data(µ¥ÀÌÅÍ) - Little Endian
                                  -----                    --------                  -----                        
                                  0x00                    0x100                   0x37
                                  -----                    --------                  -----  
                                  0x00                    0x101                   0x00
                                  -----                    --------                  -----
                                  0x00                    0x102                   0x00
                                  -----                    --------                  -----
                                  0x37                    0x103                   0x00
                                  -----                    --------                  -----

0x00000037 Àº '7' ÀÔ´Ï´Ù.

ÀÌÁ¦ ´ÙÀ½°ú °°Àº C Äڵ带 »ý°¢ÇØ º¾½Ã´Ù.

#include <stdio.h>

void main()
{
             int Number = 7;
             long *lp = (long *) &Number;
             char *cp = (char *) &Number;
            
             //ÀÌÇÏ »ý·«, ( Æ÷ÀÎÅÍ°¡ ÀÌÇØ¾ÈµÇ½Å´Ù¸é °ï¶õÇÕ´Ï´Ù... )
}

ÀÚ, ÀÌÁ¦ Çѹø ´õ »ý°¢Çغ¸Á®.

¸¸¾à ¹öÆÛ¿¡ ÀúÀåµÇ´Â ¹æ½ÄÀÌ Big Endian ¹æ½ÄÀ̶ó¸é,

´ÙÀ½°ú °°Àº ½ÄÀÌ ¼º¸³ÇÒ±î¿ä?

Number == *lp == *cp == 7

´äÀº "±×·¸Áö ¾Ê´Ù." ÀÔ´Ï´Ù.


C language ¿¡¼­,

int ÇüÀº 4byte Å©±âÀÇ ÀÚ·áÇüÀÔ´Ï´Ù.            

long ÇüÀº 4byte Å©±âÀÇ ÀÚ·áÇüÀÔ´Ï´Ù.

±×·¯³ª " char ÇüÀº 1byte Å©±âÀÇ ÀÚ·áÇüÀÔ´Ï´Ù. "


char ÇüÀº µ¥ÀÌÅÍÀ» °¡Á®¿Ã¶§ 1byteÅ©±â¸¸À» °¡Á®¿À°ÚÁÒ. ( À§ÀÇ ½ºÅà ±×¸²¿¡¼­ Á¦ÀÏ À­ºÎºÐÀÇ ÇÑÄ­¸¸ )

Áï, Big Endian ¹æ½ÄÀ̶ó°í °¡Á¤ÇÑ´Ù¸é À§ Äڵ忡¼­ *cp °¡ °¡¸£Å°´Â °ªÀº ' 0 ' À̶ó´Â °Í ÀÔ´Ï´Ù.



ÀÌ¿Í °°Àº »óȲ¶§¹®¿¡ Little Endian ¹æ½ÄÀ» »ç¿ëÇÏ´Â °Í ÀÔ´Ï´Ù.

À§ÀÇ ½ºÅà ±×¸²À» º¸½Ã¸é Little Endian ¹æ½ÄÀº ½ºÅÃÀÇ Á¦ÀÏ À­ ºÎºÐ¿¡ ³·Àº ÀÚ¸® ¼öÀÇ °ªÀÌ µé¾î°¡°Ô µË´Ï´Ù.


±×·¯¹Ç·Î ½ºÅÃÀÇ Push & Pop ¹æ½Ä¿¡¼­ ( µ¥ÀÌÅ͸¦ Â÷°îÂ÷°î ½×¾Æ³õ°í, Á¦ÀÏ À§¿¡ °Í ºÎÅÍ ²¨³»¿À´Â ¹æ½Ä )

¿¹Á¦¿Í °°Àº »óȲÀÌ ¹ß»ýÇÏÁö ¾Ê°Ô µË´Ï´Ù.


Áï, charÇüÀÌ µ¥ÀÌÅ͸¦ °¡Á®¿Ã¶§ 1byte Å©±â¸¸À» °¡Á®¿À´õ¶óµµ Á¦ÀÏ ³·Àº ÀÚ¸® ¼öÀÇ °ªÀÌ ½ºÅÃÀÇ Á¦ÀÏ À§¿¡ ÀúÀå

µÇ¹Ç·Î ¿¹Á¦¿Í °°Àº »óȲÀÌ ¹ß»ýÇÏÁö ¾Ê´Â°Ì´Ï´Ù. ( ÀúÀåµÈ µ¥ÀÌÅÍ°¡ ¾öû Ä¿Áø´Ù¸é ©¸®°ÚÁö¸¸ )



ÀÌ·¯Çϱ⠶§¹®¿¡

x86, Dec Alpha , µîµî,, ¿¡¼­´Â Little Endian ¹æ½ÄÀ» »ç¿ëÇÕ´Ï´Ù.


±×·³ Big Endian ¹æ½ÄÀº ¾îµð¼­ »ç¿ëµÇ´À³Ä?

³×Æ®¿öÅ© ÆÐŶ
( ÆÐŶÀÌ ¿À´Â Á·Á· Çؼ®ÇØ¾ß Çϴϱî Big Endian ¹æ½ÄÀ̾î¾ß °ÚÁÒ? ÆÐŶÀÌ °Å²Ù·Î µÚÁýÈùä·Î Àü¼ÛµÇ¾î ¿Â´Ù¸é ÆÐŶºÐ¼®ÇÒ¶§ ¸àºØÇÒµí,,, )

Java
( µð¹ö±ëÇÒ¶§ ÆíÇÕ´Ï´Ù. )

µîµî,,,¿¡¼­ »ç¿ëµË´Ï´Ù.





¿À·£¸¸¿¡ °­ÁÂ±Û ¾²³×¿ä ¤¾

ÇÏÁö¸¸ Á¦ °­Á±ÛÀº Á¦°¡ ³ªÁß¿¡ ±î¸Ô¾úÀ»¶§ ±â¾ïÇϱ⠽±°Ô Çϱâ À§ÇÑ ±ÛÀ̶ó ´ëÃæ ¼³¸íÇÑ ºÎºÐµµ ÀÖ´Ù´Â °ÍÀ»

¾Ë¾ÆÁÖ¼¼¿ä ¤Ð-¤Ð¤»


ÀоîÁּż­ °¨»çÇÕ´Ï´Ù.

  Hit : 7000     Date : 2012/03/09 04:30



    
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2012/03/09  
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junhyung7 Çпø¿¡¼­µµ µéÀ»¼ö ¾ø¾ú´ø °­ÀÇ ³»¿ë °¨»çµå·Á¿ä!!!! 2012/03/10  
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