SEI CERT C Coding Standard

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changes.mady.by.user Caden Milne

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Comment: REM Cost Reform

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Accessing an object by means of any other lvalue expression (other than unsigned char) is undefined behavior 3736.

Noncompliant Code Example

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According to the C Standard, 6.7.7.3 [ISO/IEC 9899:2024], using two or more incompatible arrays in an expression is undefined behavior. (See also undefined behavior 7673.)

For two array types to be compatible, both should have compatible underlying element types, and both size specifiers should have the same constant value. If either of these properties is violated, the resulting behavior is undefined.

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Recommendation

Severity

Likelihood

Detectable

RepairableRemediation Cost

Priority

Level

EXP39-C

Medium

Unlikely

No

HighNo

P2

L3

Automated Detection

Tool

Version

Checker

Description

Cppcheck Premium

Include Page
Cppcheck Premium_V
Cppcheck Premium_V

premium-cert-exp39-c
Helix QAC

Include Page
Helix QAC_V
Helix QAC_V

C0310, C0751, C3305

C++3017, C++3030, C++3033


Klocwork

Include Page
Klocwork_V
Klocwork_V

MISRA.CAST.FUNC_PTR.2012
MISRA.CAST.INCOMPLETE_PTR_TO_ANY.2012
MISRA.CAST.OBJ_PTR_TO_NON_INT.2012
MISRA.CAST.OBJ_PTR_TO_OBJ_PTR.2012


LDRA tool suite
Include Page
LDRA_V
LDRA_V
94 S, 554 SPartially implemented
Parasoft C/C++test

Include Page
Parasoft_V
Parasoft_V

CERT_C-EXP39-a
CERT_C-EXP39-b
CERT_C-EXP39-c
CERT_C-EXP39-d
CERT_C-EXP39-e
CERT_C-EXP39-f

There shall be no implicit conversions from integral to floating type
A cast should not be performed between a pointer to object type and a different pointer to object type
Avoid accessing arrays and pointers out of bounds
Avoid buffer overflow from tainted data due to defining incorrect format limits
Avoid buffer read overflow from tainted data
Avoid buffer write overflow from tainted data

Polyspace Bug Finder

Include Page
Polyspace Bug Finder_V
Polyspace Bug Finder_V

CERT C: Rule EXP39-C

Checks for cast to pointer pointing to object of different type (rule partially covered)

PVS-Studio

Include Page
PVS-Studio_V
PVS-Studio_V

 V580

Related Vulnerabilities

Search for vulnerabilities resulting from the violation of this rule on the CERT website.

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