IO.TAINT.SIZE : Tainted Allocation Size

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An allocation size is based on a tainted value. It may therefore be unreasonably small (which may lead to buffer overflows) or unreasonably large (which may lead to resource exhaustion).

Class Name

Tainted Allocation Size

Significance

security

Mnemonic

IO.TAINT.SIZE

Categories

MisraC2023	MisraC2023:D.4.14	The validity of values received from external sources shall be checked
Misra2012	Misra2012:D.4.14	The validity of values received from external sources shall be checked
AUTOSARC++14	AUTOSARC++14:A27-0-1	Inputs from independent components shall be validated.
CWE	CWE:131	Incorrect Calculation of Buffer Size
	CWE:789	Memory Allocation with Excessive Size Value
TS17961	TS17961:5.45-taintsink	5.45. Tainted, potentially mutilated, or out-of-domain integer values are used in a restricted sink
CERT-C	CERT-C:INT04-C	Enforce limits on integer values originating from tainted sources
	CERT-C:MEM05-C	Avoid large stack allocations
	CERT-C:MEM11-C	Do not assume infinite heap space
	CERT-C:MEM35-C	Allocate sufficient memory for an object
DISA-6r1	DISA-6r1:V-222606	The application must validate all input.
	DISA-6r1:V-222609	The application must not be subject to input handling vulnerabilities.
DISA-5r3	DISA-5r3:V-70265	The application must validate all input.
	DISA-5r3:V-70271	The application must not be subject to input handling vulnerabilities.
DISA-4r3	DISA-4r3:V-70265	The application must validate all input.
	DISA-4r3:V-70271	The application must not be subject to input handling vulnerabilities.
DISA-3r10	DISA-3r10:V-6164	The designer will ensure the application validates all input.

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="Tainted Allocation Size"

#include <stdio.h>
#include <stdlib.h>

int read_myinfo(FILE *f){
    char allocsize[16];
    char *infobuf;
    int bufsize;

    if (fgets(allocsize, 16, f) == NULL ) {return -1;}
    bufsize = atoi(allocsize);
    if (bufsize <= 0 || bufsize > 1000000) {return -1;}
    infobuf = malloc(bufsize); /* 'Tainted Allocation Size' warning issued here */
    if (!infobuf){return -1;}

    /* ...remainder of function */
    free(infobuf);
    return 1;
}

Tainted Allocation Size warnings can be triggered by any function treated as an allocator by CodeSonar:

any library function that is recognized as an allocator because CodeSonar ships with a library model that identifies it as such, and

any function for which you have added a library model identifying it as an allocator.

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

IO.TAINT.SIZE : Tainted Allocation Size

Summary

Properties

Example

Triggers

Relevant Configuration File Parameters