BADFUNC.MEMCMP : Use of memcmp

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A use of memcmp(), which if used on some types, might compare the vtable pointer or padding bits in between fields.

Class Name

Use of memcmp

Significance

security

Mnemonic

BADFUNC.MEMCMP

Categories

MisraC++2023	MisraC++2023:24.5.2	The C++ Standard Library functions memcpy, memmove and memcmp from <cstring> shall not be used
CERT-C	CERT-C:EXP42-C	Do not compare padding data
CERT-CPP	CERT-CPP:EXP62-CPP	Do not access the bits of an object representation that are not part of the object's value representation
	CERT-CPP:OOP57-CPP	Prefer special member functions and overloaded operators to C Standard Library functions

Availability

Available for C and C++.

Enabling

Checks for this warning class are disabled by default. To enable them, add the following WARNING_FILTER rule to the project configuration file.

WARNING_FILTER += allow class="Use of memcmp"

Compare fields individually.

To include an additional function or set of functions in the checks for this class, create a new set of BAD_FUNCTION_* rules in which the BAD_FUNCTION_REGEX setting matches the function or set of functions you want to check and the remaining rules match those in the other sets for this class.

To remove a function or set of functions from the checks for this class, edit the configuration file to comment out the corresponding set of BAD_FUNCTION_* rules.

The following configuration file parameters affect checks for this warning class.

BADFUNC.MEMCMP : Use of memcmp

Summary

Properties

Resolution

Relevant Configuration File Parameters