我創建了一個文件,打印你好,世界多次在用戶想要輸入。c堆棧粉碎檢測
#include <stdio.h>
#include <string.h>
int main() {
char message[10];
int count, i;
strcpy(message, "Hello, world!");
printf("Repeat how many times? ");
scanf("%d", &count);
for(i=0; i < count; i++)
printf("%3d - %s\n", i, message);
}
無論輸入什麼數字,它總是會導致「堆棧粉碎」。這是該計劃,任何人都可以得出結論,爲什麼它這樣做?這裏是「回溯」之後檢測堆棧粉碎髮生:
[email protected]:~/programming$ ./a.out
Repeat how many times? 12
0 - Hello, world!
1 - Hello, world!
2 - Hello, world!
3 - Hello, world!
4 - Hello, world!
5 - Hello, world!
6 - Hello, world!
7 - Hello, world!
8 - Hello, world!
9 - Hello, world!
10 - Hello, world!
11 - Hello, world!
*** stack smashing detected ***: ./a.out terminated
======= Backtrace: =========
/lib/i386-linux-gnu/libc.so.6(__fortify_fail+0x45)[0x1f8c75]
/lib/i386-linux-gnu/libc.so.6(+0xe8c27)[0x1f8c27]
./a.out[0x8048524]
/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xf3)[0x129113]
./a.out[0x80483f1]
======= Memory map: ========
00110000-00288000 r-xp 00000000 08:01 1577912 /lib/i386-linux-gnu/libc-2.13.so
00288000-0028a000 r--p 00178000 08:01 1577912 /lib/i386-linux-gnu/libc-2.13.so
0028a000-0028b000 rw-p 0017a000 08:01 1577912 /lib/i386-linux-gnu/libc-2.13.so
0028b000-0028e000 rw-p 00000000 00:00 0
0036b000-0036c000 r-xp 00000000 00:00 0 [vdso]
00454000-00470000 r-xp 00000000 08:01 1573818 /lib/i386-linux-gnu/libgcc_s.so.1
00470000-00471000 r--p 0001b000 08:01 1573818 /lib/i386-linux-gnu/libgcc_s.so.1
00471000-00472000 rw-p 0001c000 08:01 1573818 /lib/i386-linux-gnu/libgcc_s.so.1
00e7e000-00e9c000 r-xp 00000000 08:01 1573924 /lib/i386-linux-gnu/ld-2.13.so
00e9c000-00e9d000 r--p 0001d000 08:01 1573924 /lib/i386-linux-gnu/ld-2.13.so
00e9d000-00e9e000 rw-p 0001e000 08:01 1573924 /lib/i386-linux-gnu/ld-2.13.so
08048000-08049000 r-xp 00000000 00:14 3801591 /home/sean/programming/a.out
08049000-0804a000 r--p 00000000 00:14 3801591 /home/sean/programming/a.out
0804a000-0804b000 rw-p 00001000 00:14 3801591 /home/sean/programming/a.out
08a9e000-08abf000 rw-p 00000000 00:00 0 [heap]
b77e8000-b77e9000 rw-p 00000000 00:00 0
b77fc000-b7800000 rw-p 00000000 00:00 0
bff87000-bffa8000 rw-p 00000000 00:00 0 [stack]
Aborted
您可能會發現它有助於打開了你使用任何編譯器警告。例如,當我在-Wall中使用gcc時,它產生了「警告:控制達到非void函數的結束」和「調用__builtin___strcpy_chk將總是溢出目標緩衝區」,後者明確指出問題所在。 – DSM 2012-03-15 00:44:03