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CodeSonar® 9.2p0 CONFIDENTIAL CodeSecure Inc
C and C++

LANG.CAST.RIP : 危険な整数拡張

要旨

ビット演算子 ~ もしくは << が潜在型の unsigned char もしくは unsigned short のオペランドに対して適用されており、 かつその結果はオペランドの潜在型に直ちにキャストされていません。

プロパティ

クラス名 Risky Integer Promotion
日本語クラス名 危険な整数拡張
クラス分類 スタイル (style)
ニーモニック LANG.CAST.RIP
カテゴリー
Misra2004 Misra2004:10.5 If the bitwise operators ~ and << are applied to an operand of underlying type unsigned char or unsigned short, the result shall be immediately cast to the underlying type of the operand
AUTOSARC++14 AUTOSARC++14:M5-0-10 If the bitwise operators ~ and << are applied to an operand with an underlying type of unsigned char or unsigned short, the result shall be immediately cast to the underlying type of the operand.
MisraC++2008 MisraC++2008:5-0-10 If the bitwise operators ~ and << are applied to an operand with an underlying type of unsigned char or unsigned short, the result shall be immediately cast to the underlying type of the operand.
MisraC++2023 MisraC++2023:7.0.4 The operands of bitwise operators and shift operators shall be appropriate
CWE CWE:704 Incorrect Type Conversion or Cast
CERT-C CERT-C:EXP14-C Beware of integer promotion when performing bitwise operations on integer types smaller than int
JSF++ JSF++:183 Every possible measure should be taken to avoid type casting.
DISA-6r1 DISA-6r1:V-222612 The application must not be vulnerable to overflow attacks.
DISA-5r3 DISA-5r3:V-70277 The application must not be vulnerable to overflow attacks.
DISA-4r3 DISA-4r3:V-70277 The application must not be vulnerable to overflow attacks.
DISA-3r10 DISA-3r10:V-16808 The designer will ensure the application is not vulnerable to integer arithmetic issues.
対応言語 C および C++ で利用可能です。
有効/無効設定 このワーニングクラスのチェックはデフォルトで無効になっており、プロジェクトには非正規の C向けAST が必要になります。有効にするにはプロジェクト設定ファイル （configuration file） に以下の WARNING_FILTER ルールと RETAIN_UNNORMALIZED_C_AST 設定を追加してください。 
RETAIN_UNNORMALIZED_C_AST = Yes
WARNING_FILTER += allow class="Risky Integer Promotion"
注：非正規化された AST を継続して使用した場合、使用ディスク容量が増加し解析時間が長くなる可能性があります。

例 

#include <stdio.h>

void RIP(void)
{
    unsigned char c;
    c = 0xff;
    printf("c=%x\n", c);                                         /* no ~ or << operation */
    printf("~c=%x\n", ~c); /* 'Risky Integer Promotion' warning issued here */
    printf("(unsigned char)~c=%x\n", (unsigned char)~c);         /* result of ~ operation is immediately cast */  
}
/* This prints:
 *
 * c=ff
 * ~c=ffffff00
 * (unsigned char)~c=0
 */

関連のある設定ファイルパラメータ

設定ファイルの以下のパラメータがこのワーニングクラスのチェックに影響します。

 

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