非ROOT用戶能訪問另一個非ROOT用戶的文件

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#include
    #include
    #include "ourhdr.h"
    int main (int argc , char *argv[] )
    {
    if (argc != 2) {
    printf("usage: a.out \n");
    exit (0);
    }
    if (access(argv[1],R_OK) <0)
    printf("%s could not read \n",argv[1] );
    else
    printf("read access ok\n");
    if (open(argv[1], O_RDONLY ) <0)
    printf ("open error %s\n",argv[1]);
    else
    printf ("open for reading ok\n");
    exit (0);
    }
    # ll a.out fstab
    -rwxr-xr-x 1 ftp ftp 12050 2003-12-20 16:16 a.out
    -rw-r----- 1 mail mail 626 2003-12-18 21:08 fstab
    # ./a.out fstab
    read access okOS is redhat 9.0
    open for reading ok
    分特
    你shell的提示符是#啊
    你在用root的身份來運行程序，當(dāng)然可以訪問啦
    不好意思。。。用ROOT用慣了，一時沒注意。。
    發(fā)現(xiàn)用非ROOT也是用樣的提示符