PIC,PIE,shellcode,ASLR戻る ãŠã¾ã‘ : PIC,PIE,shellcode,ASLR 最後ã«ã€çŸ¥ã£ã¦ãŠãã¨ã„ã„話題ã¨ã—ã¦ã€ 昔ã‹ã‚‰ã‚ˆã使ã‚れるPICã¨å‘¼ã°ã‚Œã‚‹ãƒ—ãƒã‚°ãƒ©ãƒ ã®å½¢å¼ã«ã¤ã„ã¦èª¬æ˜Žã—ã€ ãƒ¡ãƒ¢ãƒªç ´å£Šãƒã‚°ãŒå¼•ãç½®ã“ã™shellcodeã®ç´¹ä»‹ã€ ãã‚Œã‹ã‚‰PICを応用ã—ã¦shellcodeã®å•é¡Œã‚’ç·©å’Œã™ã‚‹æ‰‹æ³•ã§ã‚ã‚‹ ASLR ã«ã¤ã„ã¦èª¬æ˜Žã—ã¦ãŠã“ã†ã€‚ PIC (Position Independent Code:ä½ç½®ç‹¬ç«‹ã‚³ãƒ¼ãƒ‰)ã¨ã¯ã€ã©ã‚“ãªã‚¢ãƒ‰ãƒ¬ã‚¹ã«é…ç½®ã•ã‚Œã¦ã‚‚動作ã™ã‚‹æ©Ÿæ¢°èªžã‚³ãƒ¼ãƒ‰ã®ã“ã¨ã 。 ã“ã“ã¾ã§èª¬æ˜Žã—ã¦ããŸæ©Ÿæ¢°èªžãƒ—ãƒã‚°ãƒ©ãƒ ã¯ã€PICã§ã¯ãªã‹ã£ãŸã€‚例ãˆã°ã€æ¬¡ã®ELF実行ファイルを考ãˆã‚ˆã†ã€‚ pic_pie/no_pic.s .globl _start .text _start: incl data0 mov $60, %rax syscall .data data0: .long 8 $ as -o no_p
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