It is possible to assign modify the value of a constant object by using a non-constant value, but the resulting behavior is undefined. According to C99 Section 6.7.3, "Type qualifiers," Paragraph 5:
...
The compliant solution depends on the intention of the programmer. If the intention is that the value of c is modifiable, then it should not be declared as a constant. If the intention is that the value of c is not meant to change, then do not write non-compliant code that attempts to modify it.
Risk Assessment
Integer truncation errors can lead to buffer overflows and the execution of arbitrary code by an attackerModifying constant values through non-constant references results may result in unexpected program behavior.
Rule | Severity | Likelihood | Remediation Cost | Priority | Level |
|---|---|---|---|---|---|
EXP31-C | 1 (low) | 1 (unlikely) | 2 (medium) | P2 | L3 |
...
| Wiki Markup |
|---|
\[[ISO/IEC 9899-1999|AA. C References#ISO/IEC 9899-1999]\] Section 6.7.3, "Type qualifiers," and Section 6.5.16.1, "Simple assignment" |
...