Beat up the nfs , expose flip bug.. profit.

gistfile1.c

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>


#define MAXLEN 31
#define PATH_PREFIX "/tmp/fhleak-mnt"

#define RUNTEST(f) stat_test(f)

// #define RUNTEST(f) open_noexist_test(f)
// #define RUNTEST(f) open_exists_test(f)


/* force a stat on non existant file, work the filp */
void stat_test(char *filepath) {

        struct stat *buf;
        stat(filepath, buf);

}

void create_random_filename(char *s) {

        int i = 0;

        static const char alphanum[] =
                "0123456789"
                "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
                "abcdefghijklmnopqrstuvwxyz";

        for(i = 0; i < (MAXLEN - 1); i++) {
                s[i] = alphanum[rand() % (sizeof(alphanum) - 1)];
        }

        s[MAXLEN] = '\0';

}


void get_random_file_in_path(char *p) {

        char *filename;
        int len;

        filename = malloc(sizeof(char) * MAXLEN);
        len = strlen(PATH_PREFIX) + strlen(filename);

        memset(filename, MAXLEN, '\0');
        create_random_filename(filename);

        sprintf(p, "%s/%s", PATH_PREFIX, filename);
        printf("P: %s\n", p);

        free(filename);


}

int main(void) {

        int i = 0;
        int len = 0;

        char *fullpath = NULL;

        while(i <= 100) {
                len = strlen(PATH_PREFIX) + MAXLEN;
                fullpath = malloc(len);
                get_random_file_in_path(fullpath);
                printf("got path: %s\n",fullpath);
                RUNTEST(fullpath);
                free(fullpath);
        }
}

cat /proc/slabinfo | grep filp Watch filp go up. Can't reproduce this just yet.