SEI CERT C Coding Standard

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Old Version 42

changes.mady.by.user David Svoboda

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New Version 43

changes.mady.by.user Robert Seacord (Manager)

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Code Block
bgColor#ffcccc
struct bf {
  unsigned int m1 : 8;
  unsigned int m2 : 8;
  unsigned int m3 : 8;
  unsigned int m4 : 8;
}; /* 32 bits total */

void function() {
  struct bf data;
  unsigned char *ptr;

  data.m1 = 0;
  data.m2 = 0;
  data.m3 = 0;
  data.m4 = 0;
  ptr = (unsigned char *)&data;
  (*ptr)++; /* couldcan increment data.m1 or data.m4 */
}

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Code Block
bgColor#ccccff
struct bf {
  unsigned int m1 : 6;
  unsigned int m2 : 4;
};

void function() {
  struct bf data;
  data.m1 = 0;
  data.m2 = 0;
  data.m2 += 1;
}

Automated Detection

The tool Compass/ROSE could can detect the NCCE's easily. It need merely search for the following pattern:

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