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The C Standard, 6.3.2.3, paragraph 7 [ISO/IEC 9899:20112024], states
A pointer to an object or incomplete type may be converted to a pointer to a different object or incomplete type. If the resulting pointer is not correctly aligned for the referenced the referenced type, the behavior is undefined.
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Tool | Version | Checker | Description | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Astrée |
| pointer-cast-alignment | Fully checked | ||||||
| Axivion Bauhaus Suite |
| CertC-EXP36 | |||||||
| CodeSonar |
| LANG.CAST.PC.OBJ | Cast: Object Pointers | ||||||
| Compass/ROSE | Can detect violations of this rule. However, it does not flag explicit casts to | ||||||||
| Coverity |
| MISRA C 2004 Rule 11.4 MISRA C 2012 Rule 11.1 MISRA C 2012 Rule 11.2 MISRA C 2012 Rule 11.5 MISRA C 2012 Rule 11.7 | Implemented | ||||||
| Cppcheck Premium |
| premium-cert-exp36-c | Partially implemented | ||||||
| CC2.EXP36 | Fully implemented | |||||||
| EDG | |||||||||
| GCC |
| Can detect some violations of this rule when the | |||||||
| Helix QAC |
| C0326, C3305 C++3033, C++3038 | |||||||
| Klocwork |
| MISRA.CAST.OBJ_PTR_TO_OBJ_PTR.2012 | |||||||
| LDRA tool suite |
| 94 S, 606 S | Partially implemented | ||||||
| Parasoft C/C++test |
| CERT_C-EXP36-a | Do not cast pointers into more strictly aligned pointer types | ||||||
| PC-lint Plus |
| 2445 | Partially supported: reports casts directly from a pointer to a less strictly aligned type to a pointer to a more strictly aligned type | ||||||
| Polyspace Bug Finder |
| Checks for source buffer misaligned with destination buffer (rule fully covered) | |||||||
| PVS-Studio |
| V548, V641, V1032 | |||||||
| RuleChecker |
| pointer-cast-alignment | Fully checked |
Related Vulnerabilities
Search for vulnerabilities resulting from the violation of this rule on the CERT website.
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| [Bryant 2003] | |
| [ISO/IEC 9899:20112024] | 6.3.2.3, "Pointers" |
| [Walfridsson 2003] | Aliasing, Pointer Casts and GCC 3.3 |
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