memcmp（）检查程序：内存访问错误

$ rm checker.out $ ls -l sample.kdf -rwxr-xr-x 1 chen mitarb 3075 Feb 10 1997 sample.kdf $ ./a.out sample.kdf type = 3 $ cat checker.out Checker 0.9.9.1（i686-pc-linux-gnu）版权所有（C）1998 Tristan Gingold。 这个程序是用`checkergcc''或`checkerg ++''编译的。 Checker是一个内存访问检测器。 Checker的发布是希望它有用， 但没有任何担保;甚至没有暗示的保证 适销性或特定用途的适用性。有关更多详细信息，请参阅GNU 通用公共许可证。 有关更多信息，请将CHECKEROPTS设置为`--help'' /*Hi, I have removed things irrelevant to reproducing the problem.What''s wrong with my code? Thanks in advance for any hint!1166425362*/#include <stdio.h>#include <stdlib.h>#include <string.h>#include <assert.h> int probe_img(FILE *fp){unsigned char *data;unsigned char KDF_header[4]={0x01, 0x03, 0x13, 0x5E};int probe_len = 256;int type=-1; data = malloc( probe_len );assert ( NULL != data );assert ( 1 == fread(data, probe_len, 1, fp) ); if ( !memcmp(data, KDF_header, 4) ){type = 3;} return type;} int main(void){FILE *fp = fopen("sample.kdf", "r");assert ( NULL != fp);printf("type=%d\n", probe_img(fp) );return 0;} /*$ echo $CHECKEROPTS-p -v -t -o=checker.out$ !checchecker gcc -Wall bug.c$ rm checker.out$ ls -l sample.kdf-rwxr-xr-x 1 chen mitarb 3075 Feb 10 1997 sample.kdf$ ./a.out sample.kdftype=3$ cat checker.out Checker 0.9.9.1 (i686-pc-linux-gnu) Copyright (C) 1998 Tristan Gingold.This program has been compiled with `checkergcc'' or `checkerg++''.Checker is a memory access detector.Checker is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNUGeneral Public License for more details.For more information, set CHECKEROPTS to `--help'' >来自Checker（pid：03038）：`./a.out''正在运行（Sun Dec 17 22:47:01 >From Checker (pid:03038): `./a.out'' is running (Sun Dec 17 22:47:01 2006） 2006) >来自Checker（pid：03038）:( mes）用户调试消息。 >From Checker (pid:03038): (mes) debugging message for the user. 开始结束权利名称路径 08048000 0805b58c T-rx .text ./a.out 0805c000 0805fdbc -D rw- .data b7fa9000 b7fb27fc T-rx .text /lib/libgcc_s.so.1 b7fb37fc b7fb4000 -D rw- .data / lib / libgcc_s .so.1 08048000 0805b58c T-rx .text 0805c000 0805fdbc -D rw- .data b7e60000 b7f875a4 T-rx .text /lib/tls/libc.so.6 b7f8815c b7f9189c -D rw- .data /lib/tls/libc.so.6 b7fb7000 b7fcb808 T-rx。 text /lib/ld-linux.so.2 b7fccca0 b7fce000 -D rw- .data /lib/ld-linux.so.2 begin end rights name path08048000 0805b58c T- r-x .text ./a.out0805c000 0805fdbc -D rw- .datab7fa9000 b7fb27fc T- r-x .text /lib/libgcc_s.so.1b7fb37fc b7fb4000 -D rw- .data /lib/libgcc_s.so.108048000 0805b58c T- r-x .text0805c000 0805fdbc -D rw- .datab7e60000 b7f875a4 T- r-x .text /lib/tls/libc.so.6b7f8815c b7f9189c -D rw- .data /lib/tls/libc.so.6b7fb7000 b7fcb808 T- r-x .text /lib/ld-linux.so.2b7fccca0 b7fce000 -D rw- .data /lib/ld-linux.so.2 >来自Checker（pid：03038）:( mes）用户调试消息。 >From Checker (pid:03038): (mes) debugging message for the user. 内存图： 名称|基地|结束|尺寸| RWX |输入 --------------- + ------------ + ------------ + ------------- + ----- + ----- NULL zone | 0x00000000 | 0x08047fff | 128 Mb | --- |无效 文本段| 0x08048000 | 0x0805b58b | 77 kb | r-x |文字 ..text | 0x08048000 | 0x0805b58b | 77 kb | r-x | ROnly （无）| 0x0805b58c | 0x0805bfff | 2 kb | --- | - 数据段| 0x0805c000 | 0x0805fdbb | 15 kb | rw- | RW ..data | 0x0805c000 | 0x0805fdbb | 15 kb | rw- | RW （无）| 0x0805fdbc | 0xb7e5ffff | 2814 Mb | --- | - ..text | 0xb7e60000 | 0xb7f875a3 | 1181 kb | r-x | ROnly （无）| 0xb7f875a4 | 0xb7f87fff | 2 kb | --- | - ..数据| 0xb7f88000 | 0xb7f9189b | 38 kb | rw- | RW （无）| 0xb7f9189c | 0xb7fa8fff | 93 kb | --- | - ..text | 0xb7fa9000 | 0xb7fb27fb | 37 kb | r-x | ROnly （无）| 0xb7fb27fc | 0xb7fb2fff | 2 kb | --- | - ..数据| 0xb7fb3000 | 0xb7fb3fff | 4 kb | rw- | RW （无）| 0xb7fb4000 | 0xb7fb6fff | 12 kb | --- | - ..text | 0xb7fb7000 | 0xb7fcb807 | 82 kb | r-x | ROnly （无）| 0xb7fcb808 | 0xb7fcbfff | 2040 b | --- | - ..数据| 0xb7fcc000 | 0xb7fcdfff | 8 kb | rw- | RW （无）| 0xb7fce000 | 0xbffcd7b3 | 127 Mb | --- | - stack | 0xbffcd7b4 | 0xbfffffff | 202 kb | rwx |正常 ＃malloc（352）= 0x8060134; ＃malloc（256）= 0x80602d4; Memory map:Name | Base | End | Size | RWX | Type---------------+------------+------------+-------------+-----+-----NULL zone | 0x00000000 | 0x08047fff | 128 Mb | --- | Voidtext segment | 0x08048000 | 0x0805b58b | 77 kb | r-x | Text..text | 0x08048000 | 0x0805b58b | 77 kb | r-x | ROnly(nothing) | 0x0805b58c | 0x0805bfff | 2 kb | --- | -data segment | 0x0805c000 | 0x0805fdbb | 15 kb | rw- | RW..data | 0x0805c000 | 0x0805fdbb | 15 kb | rw- | RW(nothing) | 0x0805fdbc | 0xb7e5ffff | 2814 Mb | --- | -..text | 0xb7e60000 | 0xb7f875a3 | 1181 kb | r-x | ROnly(nothing) | 0xb7f875a4 | 0xb7f87fff | 2 kb | --- | -..data | 0xb7f88000 | 0xb7f9189b | 38 kb | rw- | RW(nothing) | 0xb7f9189c | 0xb7fa8fff | 93 kb | --- | -..text | 0xb7fa9000 | 0xb7fb27fb | 37 kb | r-x | ROnly(nothing) | 0xb7fb27fc | 0xb7fb2fff | 2 kb | --- | -..data | 0xb7fb3000 | 0xb7fb3fff | 4 kb | rw- | RW(nothing) | 0xb7fb4000 | 0xb7fb6fff | 12 kb | --- | -..text | 0xb7fb7000 | 0xb7fcb807 | 82 kb | r-x | ROnly(nothing) | 0xb7fcb808 | 0xb7fcbfff | 2040 b | --- | -..data | 0xb7fcc000 | 0xb7fcdfff | 8 kb | rw- | RW(nothing) | 0xb7fce000 | 0xbffcd7b3 | 127 Mb | --- | -stack | 0xbffcd7b4 | 0xbfffffff | 202 kb | rwx | Normal# malloc (352) = 0x8060134;# malloc (256) = 0x80602d4; >来自Checker（pid：03038）:( rus）读取中未初始化的字节>From Checker (pid:03038): (rus) read uninitialized byte(s) in the stack。 在地址0xbffce798读取1个字节时，在堆栈内。 已知堆栈限制= 0xbffce680 stack.When Reading 1 byte(s) at address 0xbffce798, inside the stack.known stack limit= 0xbffce680 >来自Checker（pid：03038）:( mes）用户调试消息。 >From Checker (pid:03038): (mes) debugging message for the user. 08 09 0a 0b 0c 0d 0e 0f 00 01 02 03 04 05 06 07 0xbffce798：WWWW RW RW RW RW RW RW RW RW RW RW RW RW 0xbffce7a8：RW RW RW RW WWWW RW RW RW RW RW RW RW RW 堆栈帧为： pc =在checker_text_stubs_begin中的0x08055bb2 stubs / begin-stubs.c：7 pc = 0x08048d73在bug.c中的probe_img：25 pc =主要在bug.c的0x08048fdb：37 pc = 0x08055d53在checker_text_stubs_begin中 stubs / begin-stubs.c：7 pc =在stubs / end-stubs.c的checker_text_stubs_end中的0xb7e74ea8：7 pc = 0x080487e8 in * unknown * at * unknown *：0 08 09 0a 0b 0c 0d 0e 0f 00 01 02 03 04 05 06 070xbffce798: W W W W RW RW RW RW RW RW RW RW RW RW RW RW0xbffce7a8: RW RW RW RW W W W W RW RW RW RW RW RW RW RWStack frames are:pc=0x08055bb2 in checker_text_stubs_begin atstubs/begin-stubs.c:7pc=0x08048d73 in probe_img at bug.c:25pc=0x08048fdb in main at bug.c:37pc=0x08055d53 in checker_text_stubs_begin atstubs/begin-stubs.c:7pc=0xb7e74ea8 in checker_text_stubs_end at stubs/end-stubs.c:7pc=0x080487e8 in *unknown* at *unknown*:0 >来自Checker（pid：03038）:( rus）读取 >From Checker (pid:03038): (rus) read uninitialized byte(s) in the 堆栈中未初始化的字节。 阅读时1堆栈内地址为0xbffce799的字节。 已知堆栈限制= 0xbffce680 stack.When Reading 1 byte(s) at address 0xbffce799, inside the stack.known stack limit= 0xbffce680 >来自Checker（pid：03038） ： （mes）为用户调试消息。 >From Checker (pid:03038): (mes) debugging message for the user. 08 09 0a 0b 0c 0d 0e 0f 00 01 02 03 04 05 06 07 0xbffce798：WWWW RW RW RW RW RW RW RW RW RW RW RW RW 0xbffce7a8：RW RW RW RW WWWW RW RW RW RW RW RW RW RW 堆栈帧为： pc =在checker_text_stubs_begin中的0x08055bb2 stubs / begin-stubs.c：7 pc = 0x08048d73在bug.c中的probe_img：25 pc =主要在bug.c的0x08048fdb：37 pc = 0x08055d53在checker_text_stubs_begin中 stubs / begin-stubs.c：7 pc =在stubs / end-stubs.c的checker_text_stubs_end中的0xb7e74ea8：7 pc = 0x080487e8 in * unknown * at * unknown *：0 08 09 0a 0b 0c 0d 0e 0f 00 01 02 03 04 05 06 070xbffce798: W W W W RW RW RW RW RW RW RW RW RW RW RW RW0xbffce7a8: RW RW RW RW W W W W RW RW RW RW RW RW RW RWStack frames are:pc=0x08055bb2 in checker_text_stubs_begin atstubs/begin-stubs.c:7pc=0x08048d73 in probe_img at bug.c:25pc=0x08048fdb in main at bug.c:37pc=0x08055d53 in checker_text_stubs_begin atstubs/begin-stubs.c:7pc=0xb7e74ea8 in checker_text_stubs_end at stubs/end-stubs.c:7pc=0x080487e8 in *unknown* at *unknown*:0 >来自Checker（pid：03038）:( rus）读取 >From Checker (pid:03038): (rus) read uninitialized byte(s) in the 堆栈中未初始化的字节。 阅读时1堆栈内地址为0xbffce79a的字节。 已知堆栈限制= 0xbffce680 stack.When Reading 1 byte(s) at address 0xbffce79a, inside the stack.known stack limit= 0xbffce680 >来自Checker（pid：03038） ： （mes）为用户调试消息。 >From Checker (pid:03038): (mes) debugging message for the user. 08 09 0a 0b 0c 0d 0e 0f 00 01 02 03 04 05 06 07 0xbffce798：WWWW RW RW RW RW RW RW RW RW RW RW RW RW 0xbffce7a8：RW RW RW RW WWWW RW RW RW RW RW RW RW RW 堆栈帧为： pc =在checker_text_stubs_begin中的0x08055bb2 stubs / begin-stubs.c：7 pc = 0x08048d73在bug.c中的probe_img：25 pc =主要在bug.c的0x08048fdb：37 pc = 0x08055d53在checker_text_stubs_begin中 stubs / begin-stubs.c：7 pc =在stubs / end-stubs.c的checker_text_stubs_end中的0xb7e74ea8：7 pc = 0x080487e8 in * unknown * at * unknown *：0 08 09 0a 0b 0c 0d 0e 0f 00 01 02 03 04 05 06 070xbffce798: W W W W RW RW RW RW RW RW RW RW RW RW RW RW0xbffce7a8: RW RW RW RW W W W W RW RW RW RW RW RW RW RWStack frames are:pc=0x08055bb2 in checker_text_stubs_begin atstubs/begin-stubs.c:7pc=0x08048d73 in probe_img at bug.c:25pc=0x08048fdb in main at bug.c:37pc=0x08055d53 in checker_text_stubs_begin atstubs/begin-stubs.c:7pc=0xb7e74ea8 in checker_text_stubs_end at stubs/end-stubs.c:7pc=0x080487e8 in *unknown* at *unknown*:0 >来自Checker（pid：03038）:( rus）读取 >From Checker (pid:03038): (rus) read uninitialized byte(s) in the 堆栈中未初始化的字节。 阅读时1堆栈内地址为0xbffce79b的字节。 已知堆栈限制= 0xbffce680 stack.When Reading 1 byte(s) at address 0xbffce79b, inside the stack.known stack limit= 0xbffce680 >来自Checker（pid：03038） ： （mes）为用户调试消息。 >From Checker (pid:03038): (mes) debugging message for the user. 08 09 0a 0b 0c 0d 0e 0f 00 01 02 03 04 05 06 07 0xbffce798：WWWW RW RW RW RW RW RW RW RW RW RW RW RW 0xbffce7a8：RW RW RW RW WWWW RW RW RW RW RW RW RW RW 堆栈帧为： pc =在checker_text_stubs_begin中的0x08055bb2 stubs / begin-stubs.c：7 pc = 0x08048d73在bug.c中的probe_img：25 pc =主要在bug.c的0x08048fdb：37 pc = 0x08055d53在checker_text_stubs_begin中 stubs / begin-stubs.c：7 pc =在stubs / end-stubs.c的checker_text_stubs_end中的0xb7e74ea8：7 pc = 0x080487e8 in * unknown * at * unknown *：0 08 09 0a 0b 0c 0d 0e 0f 00 01 02 03 04 05 06 070xbffce798: W W W W RW RW RW RW RW RW RW RW RW RW RW RW0xbffce7a8: RW RW RW RW W W W W RW RW RW RW RW RW RW RWStack frames are:pc=0x08055bb2 in checker_text_stubs_begin atstubs/begin-stubs.c:7pc=0x08048d73 in probe_img at bug.c:25pc=0x08048fdb in main at bug.c:37pc=0x08055d53 in checker_text_stubs_begin atstubs/begin-stubs.c:7pc=0xb7e74ea8 in checker_text_stubs_end at stubs/end-stubs.c:7pc=0x080487e8 in *unknown* at *unknown*:0 >来自Checker（pid：03038）:( prf）个人资料结果。 >From Checker (pid:03038): (prf) profile results. 堆栈被处理（访问）130次。 数据段被处理（访问）0次。 文本段被处理（访问）4次。 NULL区域被处理（访问）0次。 .text被处理（访问）0时间。 .data被处理（访问）0次。 .text被处理（访问）0次。 。数据被处理（访问）0次。 .x被处理（访问）0次。 .data被处理（访问）0次。 .text被处理（访问）0次。 .data被处理（访问）0次。 堆（sbrk）被处理（访问）10次。 程序访问内存144次。 堆栈限制调整了47次。 4个内存访问错误报告。 4内存访问错误。 2 malloc / mmalloc调用。 0免费/ mfree电话。 0 realloc / mrealloc电话。 用于垃圾检测的总时间：0秒（s）0次使用。 * / The stack was handled (accessed) 130 times.The data segment was handled (accessed) 0 time.The text segment was handled (accessed) 4 times.The NULL zone was handled (accessed) 0 time.The .text was handled (accessed) 0 time.The .data was handled (accessed) 0 time.The .text was handled (accessed) 0 time.The .data was handled (accessed) 0 time.The .text was handled (accessed) 0 time.The .data was handled (accessed) 0 time.The .text was handled (accessed) 0 time.The .data was handled (accessed) 0 time.The heap (sbrk) was handled (accessed) 10 times.The program accessed memory 144 times.The stack limit was adjusted 47 times.4 memory access errors reported.4 memory access errors.2 malloc/mmalloc calls.0 free/mfree calls.0 realloc/mrealloc calls.Total time used for garbage detecting: 0 sec(s) 0 usecs. */ 推荐答案 echo CHECKEROPTS -p -v -t -o = checker.out CHECKEROPTS-p -v -t -o=checker.out ！chec checker gcc -Wall bug.c !checchecker gcc -Wall bug.c 这篇关于memcmp（）检查程序：内存访问错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！