IO.UAC : クローズ後の使用

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CodeSonar^® 9.2p0

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IO.UAC : クローズ後の使用

要旨

既にクローズされているファイルやソケットを使用しようとしています。

プロパティ

MisraC2025

MisraC2025:22.6

The value of a pointer to a FILE shall not be used after the associated stream has been closed

MisraC2023

MisraC2023:22.6

The value of a pointer to a FILE shall not be used after the associated stream has been closed

Misra2012

Misra2012:22.6

The value of a pointer to a FILE shall not be used after the associated stream has been closed

AUTOSARC++14

AUTOSARC++14:A3-8-1

An object shall not be accessed outside of its lifetime.

MisraC++2023

MisraC++2023:0.3.2

A function call shall not violate the function's preconditions

MisraC++2023:6.8.1

An object shall not be accessed outside of its lifetime

MisraC++2023:15.8.1

User-provided copy assignment and move assignment operators shall handle self-assignment

CWE

CWE:666

Operation on Resource in Wrong Phase of Lifetime

CWE:672

Operation on a Resource after Expiration or Release

CWE:696

Incorrect Behavior Order

CWE:910

Use of Expired File Descriptor

CERT-C

CERT-C:FIO46-C

Do not access a closed file

CERT-CPP

CERT-CPP:EXP54-CPP

Do not access an object outside of its lifetime

CERT-CPP:OOP54-CPP

Gracefully handle self-copy assignment

JSF++

JSF++:81

The assignment operator shall handle self-assignment correctly.

例

#include <fcntl.h>
#include <unistd.h>
#include <string.h>

int uac(char *buf){
    int fd;
    ssize_t w;

    fd = open("A.txt", O_CREAT|O_RDWR);
    if (fd < 0){return -1;}
    close(fd);
    w = write(fd, buf, strlen(buf)); /* 'Use After Close' warning issued here */
    return w;
}

ワーニングを引き起こす関数

CodeSonar ships with library models that allow it to a large number of functions that use a file or socket identified by file/socket descriptor. If one of these functions is called with a file/socket descriptor argument associated with a file or socket that has already been closed, a warning will be issued.

If you have created a custom library model for some function f() in terms of one of these existing models, calls to f() will also be capable of triggering Use After Close warnings.

	Functions that can trigger a warning include...
libc	dup(), fdopen(), stat()
Win32	_lseek(), _read(), _write()

Functions that can trigger a warning include...

libc

dup(), fdopen(), stat()

Win32

_lseek(), _read(), _write()

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。