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Problem 1
Read Ken Thompson's article ...

char s[] = {
'\t',
'0',
'\n',
'}',
';",
'\n',
'\n',
'/',
'*',
'\n',
(213 lines deleted)
0
};

/* The string s is a
* representation of the body
* of this program from '0'
* to the end.
*/

main(){
  int i;
  printf("char\ts{ } = {\n");
  for(i=0; s[i]; i++)
      printf("\t%d,\n",s[i]);
  printf("%s",s);
}
Compile and run this program. You will have to figure out what goes in the 213 deleted lines. If you want, you can leave the comment out of the string s and out of the program. Explain the output. By itself, this program does not pose any sort of security threat. Explain in your own words what this program has to do with Thompson's Trojan Horse attack.

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printf("%s",s); Ö´ÐÐÕâ¾äµÄʱºò£¬s[1]µÄ'0'Ϊʲôû´ò³öÀ´ÄØ£¿

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up

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mark

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Figure 1 shows a s