An object that has volatile-qualified type may be modified in ways unknown to the implementation or have other unknown side effects. Referencing a volatile object by using a non-volatile lvalue is undefined behavior. The C Standard, 6.7.3 4 paragraph 7 [ISO/IEC 9899:20112024], states
If an attempt is made to refer to an object defined with a volatile-qualified type through use of an lvalue with non-volatile-qualified type, the behavior is undefined.
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Tool | Version | Checker | Description | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Astrée |
| Supported, but no explicit checkerpointer-qualifier-cast-volatile pointer-qualifier-cast-volatile-implicit | Supported indirectly via MISRA C 2012 Rule 11.8 | ||||||||||||||
| Axivion Bauhaus Suite |
| CertC-EXP32 | Fully implemented | ||||||||||||||
| Clang |
| -Wincompatible-pointer-types-discards-qualifiers | |||||||||||||||
| Compass/ROSE | |||||||||||||||||
| Coverity |
| MISRA C 2012 Rule 11.8 | Implemented | ||||||||||||||
| Cppcheck Premium |
| premium-cert-exp32-c | Partially implemented | ||||||||||||||
| GCC |
| Can detect violations of this rule when the | |||||||||||||||
| Helix QAC |
| C0312, C0562, C0563, C0673, C0674 | Fully implemented | ||||||||||||||
| Klocwork |
| CERT.EXPR.VOLATILE.ADDR | Fully implemented | ||||||||||||||
| LDRA tool suite |
| 344 S | Partially implemented | ||||||||||||||
| Parasoft C/C++test |
| MISRA2004-11_5 | Fully implementedCERT_C-EXP32-a | A cast shall not remove any 'const' or 'volatile' qualification from the type of a pointer or reference | |||||||||||||
| Polyspace Bug Finder | R2016a | Qualifier removed in conversion | Do not access a volatile object through a nonvolatile reference | PRQA QA-C | |||||||||||||
| Include Page | PRQA QA-C_v | PRQA QA-C_v | 0312,562,563,673,674 |
| Checks for cast to pointer that removes const or volatile qualification (rule fully covered) | ||||||||||||
| RuleChecker |
| pointer-qualifier-cast-volatile pointer-qualifier-cast-volatile-implicit | Supported indirectly via MISRA C 2012 Rule 11.8 | Fully implemented
Related Vulnerabilities
Search for vulnerabilities resulting from the violation of this rule on the CERT website.
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Bibliography
| [ISO/IEC 9899:20112024] | 6.7.34, "Type Qualifiers" |
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