求助：在代码中从root切换到其它用户时无法产生core文件 - Chinaunix

#include <pwd.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <stdlib.h>
int main()
{
#if 1
struct passwd *pw;
//char *username = "root";
char *username = "nobody";
if (getuid() == 0 || geteuid() == 0)
{
if (username == 0 || *username == '\0')
{
fprintf(stderr, "can't run as root without the -u switch\n");
exit(-1);
}
if ((pw = getpwnam(username)) == NULL)
{
fprintf(stderr, "can't find the user %s to switch to\n", username);
exit(-1);
}
if (setgid(pw->pw_gid) < 0 || setuid(pw->pw_uid) < 0)
{
fprintf(stderr, "failed to assume identity of user %s\n", username);
exit(-1);
}
}
#endif
printf("now user change to group id %d, user id %d\n", getgid(), getuid());
system("echo 'tesstestestestestetestestet!!!!!!' > hahahahhaahahah");
char *test_a = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
char *test_b;
strcpy(test_b, test_a);
*(char *)1=1;
printf("test_b:%s\n", test_b);
}

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