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C99 eliminated implicit function declarations from the C language \[[ISO/IEC 9899-1999:TC2|AA. C References#ISO/IEC 9899-1999TC2]\]. However, many compilers allow compilation of programs containing implicitly defined functions, although they may issue a warning message. These warnings should be resolved \[[MSC00-A|MSC00-A. Compile cleanly at high warning levels]\], but do not prevent program compilation. |
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int func(int, int, int);
/* ... */
func(1, 2);
/* ... */
int func(int one, int two, int three){
printf("%d %d %d", one, two, three);
return 1;
}
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The following example is based on rule \[[MEM02-A|MEM02-A. Do not cast the return value from malloc()]\]. The header file {{stdlib.h}} contains the function prototype for {{malloc()}}. Failing to include {{stdlib.h}} causes {{malloc()}} to be implicitly defined. |
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Rule | Severity | Likelihood | Remediation Cost | Priority | Level |
|---|---|---|---|---|---|
DCL31-C . | 1 (low) | 1 (unlikely) | 3 (low) | P3 | L3 |
Related Vulnerabilities
Search for Examples of vulnerabilities resulting from the violation of this rule can be found on the CERT website.
References
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\[[ISO/IEC 9899-1999:TC2|AA. C References#ISO/IEC 9899-1999TC2]\] Forward, Section 6.9.1, "Function definitions" |
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