ISO/IEC TS 17961:2013
Information Technology — Programming languages, their environments and system software interfaces — C Secure Coding Rules
http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1624.pdf
この文書は、ISO/IEC JTC1 SC22 WG14の作業文書(Working Draft)です。
公式のISO/IEC TS 17961:2013原本ではありません。
技術内容を検討し、ISO/IEC JTC1 SC22 WG14にフィードバックするために用いるものです。
ISO/IEC TS 17961:2013 C Secure Coding Rules(1)一覧
ISO/IEC TS 17961:2013 C Secure Coding Rules(1) All list(to be confirmed) - kaizen_nagoya @ Qiita
https://qiita.com/kaizen_nagoya/items/54e056195c4f11b850a1
一つの規則で複数回のコンパイルが必要な場合、別記事にしています。
作業予定
規則の例(断片等)をコンパイル、実行する予定です。
1: コンパイルエラーが出ないようにする。
一覧のaccfree.cがこの段階です。
2: 実行時エラーが出ないようにする。
一覧のptrcomp.cがこの段階です。
3: 意味のある出力が出るようにする。
検討中。
現状では、変な代入、奇異な操作が頻出します。
コンパイルエラーが出ないようにするなるべく短い記述で済まそうという趣旨で、他意はありません。
よりよい記述に変更する予定です。
利用コンパイラ
Apple LLVM version 9.1.0 (clang-902.0.39.1)
Target: x86_64-apple-darwin17.4.0
または
clang version 6.0.0 (tags/RELEASE_600/final)
Target: x86_64-apple-darwin17.4.0
gcc-7 (Homebrew GCC 7.3.0_1) 7.3.0
Copyright (C) 2017 Free Software Foundation, Inc.
環境(Environment)
hosted Environment macOS 10.13.3 or 10.12.9
コンパイル用shell script
C版(clangとgcc)とC++版(clang++とg++)
https://qiita.com/kaizen_nagoya/items/74220c0577a512c2d7da
5.2. Accessing freed memory[accfree]
EXAMPLE 1 In this noncompliant example, a diagnostic is required because head->next is accessed after head has been freed.
struct List { struct List *next; /* ... */ };
void free_list(struct List *head) {
for (; head != NULL; head = head->next) { // diagnostic required
free(head);
}
}
上記を含むコンパイル可能そうなコードに追記。
// ISO/IEC JTC 1/SC 22/WG 14 N 1624 Date: 2012-06-26 ISO/IEC TS 17961, p.7
// http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1624.pdf
/// lines are added by Dr. Kiyoshi Ogawa, 2018
/// Compiled on
/// Clang(LLVM) clang version 6.0.0 (tags/RELEASE_600/final)
/// GCC(GNU) gcc-7 (Homebrew GCC 7.3.0_1) 7.3.0
/// hosted Environment macOS 10.13.3 or 10.12.9
// EXAMPLE 1 In this noncompliant example, a diagnostic is required because head->next is accessed after head has been freed.
#include <stdio.h>/// for printf
#include <stdlib.h>/// for EXIT_SUCCESS
struct List { struct List *next; /* ... */ };
void free_list(struct List *head) {
for (; head != NULL; head = head->next) { // diagnostic required
printf("%ld %ld \n",(long)head, (long)head->next);
free(head);
}
}
int main(int argc, char** argv){///
struct List *lista;///
size_t sz = sizeof(List);///
lista = malloc(sz);///
lista->next = NULL;///
printf("mp:%s \n",mp);///
free_list(&lista);///
return EXIT_SUCCESS;///
}///
$ cc accfree.c
$ ./a.out
a.out(66907,0x7fffa098d340) malloc: *** error for object 0x7ffee1996748: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
Abort trap: 6
$ ./gcc7ts.sh accfree
$ clang accfree.c
140732745819992 0
accfreel(87181,0x7fffa098d340) malloc: *** error for object 0x7ffee552a758: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
./gcc7ts.sh: line 4: 87181 Abort trap: 6 ./$1l $2
$ gcc-7 accfree.c
140732796196712 4478755282
accfreeg(87190,0x7fffa098d340) malloc: *** error for object 0x7ffee8535768: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
./gcc7ts.sh: line 8: 87190 Abort trap: 6 ./$1g $2
mallocを付け加えて実行エラーが出ないようにした。
// ISO/IEC JTC 1/SC 22/WG 14 N 1624 Date: 2012-06-26 ISO/IEC TS 17961, p.7
// http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1624.pdf
/// lines are added by Dr. Kiyoshi Ogawa, 2018
/// Compiled on Clang(LLVM) and GCC(GNU)
// EXAMPLE 1 In this noncompliant example, a diagnostic is required because head->next is accessed after head has been freed.
#include <stdio.h>/// for printf
#include <stdlib.h>/// for EXIT_SUCCESS
struct List { struct List *next; /* ... */ };
void free_list(struct List *head) {
for (; head != NULL; head = head->next) { // diagnostic required
printf("%ld %ld \n",(long)head, (long)head->next);
free(head);
}
}
int main(int argc, char** argv){///
struct List *lista;///
size_t sz = sizeof(struct List);///
lista = malloc(sz);///
lista->next = NULL;///
printf("%ld \n",(long)lista);///
free_list(lista);///
return EXIT_SUCCESS;///
}///
$ cc accfree.c
$ ./a.out
140499558073152
140499558073152 0
$./gcc7ts.sh accfree
$ clang accfree.c
140206166508352
140206166508352 0
$ gcc-7 accfree.c
140691146539008
140691146539008 0
EXAMPLE 2 In this noncompliant example, a diagnostic is required because buf is written to after it has been freed.
// ISO/IEC JTC 1/SC 22/WG 14 N 1624 Date: 2012-06-26 ISO/IEC TS 17961, p.8
// http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1624.pdf
/// lines are added by Dr. Kiyoshi Ogawa, 2018
/// Compiled on
/// Clang(LLVM) clang version 6.0.0 (tags/RELEASE_600/final)
/// GCC(GNU) gcc-7 (Homebrew GCC 7.3.0_1) 7.3.0
/// hosted Environment macOS 10.13.3 or 10.12.9
// EXAMPLE 2 In this noncompliant example, a diagnostic is required because buf is written to after it has been freed.
#include <stdio.h> // for printf
#include <stdlib.h> // for EXIT_SUCCESS
#include <string.h> // for strlen
int main(int argc, char *argv[]) {///
if (argc < 2) {
printf("argc:%d\n",argc);
/* ... */
return EXIT_FAILURE;
}
char *return_val = 0;
const size_t bufsize = strlen(argv[1]) + 1;
char *buf = (char *)malloc(bufsize);
if (!buf) {
/* ... */
printf("!buf\n");
return EXIT_FAILURE;
}
/* ... */
printf("buf:%d\n",(int)buf);
free(buf);
/* ... */
return_val = strncpy(buf, argv[1], bufsize); // diagnostic required
if (return_val) {
printf("*return_val:%d\n",(int)*return_val);
/* ... */
}
return EXIT_SUCCESS;
}
./gcc7ts.sh accfree2
$ clang accfree2.c
argc:1
$ gcc-7 accfree2.c
argc:1
OgawaKiyoshi-no-MacBook-Pro:ts17961 ogawakiyoshi$ ./gcc7ts.sh accfree2 newarg
$ clang accfree2.c
buf:140704637517824
*return_val:110
$ gcc-7 accfree2.c
buf:140598275212096
*return_val:110
このプログラムは最終形です。起動パラメータなし、起動パラメータありの2種類で実行しています。
EXAMPLE 3 In this noncompliant example, a diagnostic is required because realloc may free c_str1 when it returns NULL, resulting in c_str1 being freed twice.
// ISO/IEC JTC 1/SC 22/WG 14 N 1624 Date: 2012-06-26 ISO/IEC TS 17961, p.8
// http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1624.pdf
/// lines are added by Dr. Kiyoshi Ogawa, 2018
/// Compiled on
/// Clang(LLVM) clang version 6.0.0 (tags/RELEASE_600/final)
/// GCC(GNU) gcc-7 (Homebrew GCC 7.3.0_1) 7.3.0
/// hosted Environment macOS 10.13.3 or 10.12.9
// EXAMPLE 3 In this noncompliant example, a diagnostic is required because realloc may free c_str1 when it returns NULL, resulting in c_str1 being freed twice.
#include <stdio.h> // for printf
#include <stdlib.h> // for EXIT_SUCCESS
#include <string.h> // for strlen
void f(char * c_str1, size_t size) {
char * c_str2 = (char *)realloc(c_str1, size);
if (c_str2 == NULL) {
free(c_str1); // diagnostic required
return;
}
printf("end of f\n");// added for output
}
int main(int argc, char** argv){// added by O.K.
f(argv[0], sizeof(argv[0]);// added by O.K.
return EXIT_SUCCESS;// added by O.K.
}// added by O.K.
$ cc accfree3.c
$ ./a.out
a.out(67486,0x7fffa098d340) malloc: *** error for object 0x7ffee823e8c8: pointer being realloc'd was not allocated
*** set a breakpoint in malloc_error_break to debug
Abort trap: 6
$ ./gcc7ts.sh accfree3
clang accfree3.c
accfree3l(84939,0x7fffa098d340) malloc: *** error for object 0x7ffeee5798d8: pointer being realloc'd was not allocated
*** set a breakpoint in malloc_error_break to debug
./gcc7ts.sh: line 4: 84939 Abort trap: 6 ./$1l $2
gcc-7 accfree3.c
accfree3g(84948,0x7fffa098d340) malloc: *** error for object 0x7ffee32b68d8: pointer being realloc'd was not allocated
*** set a breakpoint in malloc_error_break to debug
./gcc7ts.sh: line 7: 84948 Abort trap: 6 ./$1g $2
// ISO/IEC JTC 1/SC 22/WG 14 N 1624 Date: 2012-06-26 ISO/IEC TS 17961, p.8
// http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1624.pdf
/// lines are added by Dr. Kiyoshi Ogawa, 2018
/// Compiled on Clang(LLVM) and GCC(GNU)
// EXAMPLE 3 In this noncompliant example, a diagnostic is required because realloc may free c_str1 when it returns NULL, resulting in c_str1 being freed twice.
#include <stdio.h> /// for printf
#include <stdlib.h> /// for EXIT_SUCCESS
#include <string.h> /// for strlen
void f(char * c_str1, size_t size) {
printf("%s start of f()\n",c_str1);///
char * c_str2 = (char *)realloc(c_str1, size);
if (c_str2 == NULL) {
printf("NULL");
free(c_str1); // diagnostic required
return;
}
printf("%s end of f()\n",c_str1);///
}
int main(int argc, char** argv){///
size_t sz = sizeof(argv[0]);///
char * mp = malloc(sz);///
memcpy(mp,argv[0],sz);///
printf("mp:%s \n",mp);///
f(mp, sz);///
return EXIT_SUCCESS;///
}///
./gcc7ts.sh accfree3 new
$ clang accfree3.c
mp:./accfre
./accfre start of f()
./accfre end of f()
$ gcc-7 accfree3.c
mp:./accfre
./accfre start of f()
./accfre end of f()
#参考文献
コンパイル用shell script C版(clangとgcc)とC++版(clang++とg++)
https://qiita.com/kaizen_nagoya/items/74220c0577a512c2d7da
C言語(C++)に対する誤解、曲解、無理解、爽快。
https://qiita.com/kaizen_nagoya/items/3f3992c9722c1cee2e3a
MISRA C まとめ #include
https://qiita.com/kaizen_nagoya/items/f1a79a7cbd281607c7c9
どうやって MISRA C Example Suiteをコンパイルするか
https://qiita.com/kaizen_nagoya/items/fbdbff5ff696e2ca7f00
[C][C++]の国際規格案の例題をコンパイルするときの課題7つ。
https://qiita.com/kaizen_nagoya/items/5f4b155030259497c4de
文書履歴
ver. 0.10 初稿 20180403
ver. 0.11 gcc-7追記 20180407
ver. 0.12 Example節項目追記、修正前後記録 20180407
ver. 0.13 ありがとう追記 20230413
最後までおよみいただきありがとうございました。
いいね 💚、フォローをお願いします。
Thank you very much for reading to the last sentence.
Please press the like icon 💚 and follow me for your happy life.