void *chk_realloc(void *ptr, size_t size)
{
    struct hdr *hdr;

//  log_message("%s: %s\n", __FILE__, __FUNCTION__);

    if (!size) {
        chk_free(ptr);
        return NULL;
    }

    if (!ptr)
        return chk_malloc(size);

    hdr = meta(ptr);

    if (del(hdr) < 0) {
        intptr_t bt[MAX_BACKTRACE_DEPTH];
        int depth;
        depth = get_backtrace(bt, MAX_BACKTRACE_DEPTH);
        if (hdr->tag == BACKLOG_TAG) {
            log_message("+++ REALLOCATION %p SIZE %d OF FREED MEMORY!\n",
                       user(hdr), size, hdr->size);
            log_message("+++ ALLOCATION %p SIZE %d ALLOCATED HERE:\n",
                       user(hdr), hdr->size);
            print_backtrace(hdr->bt, hdr->bt_depth);
            /* hdr->freed_bt_depth should be nonzero here */
            log_message("+++ ALLOCATION %p SIZE %d FIRST FREED HERE:\n",
                       user(hdr), hdr->size);
            print_backtrace(hdr->freed_bt, hdr->freed_bt_depth);
            log_message("+++ ALLOCATION %p SIZE %d NOW BEING REALLOCATED HERE:\n",
                       user(hdr), hdr->size);
            print_backtrace(bt, depth);

             /* We take the memory out of the backlog and fall through so the
             * reallocation below succeeds.  Since we didn't really free it, we
             * can default to this behavior.
             */
            del_from_backlog(hdr);
        }
        else {
            log_message("+++ REALLOCATION %p SIZE %d IS CORRUPTED OR NOT ALLOCATED VIA TRACKER!\n",
                       user(hdr), size);
            print_backtrace(bt, depth);
            // just get a whole new allocation and leak the old one
            return dlrealloc(0, size);
            // return dlrealloc(user(hdr), size); // assuming it was allocated externally
        }
    }

    hdr = dlrealloc(hdr, sizeof(struct hdr) + size + sizeof(struct ftr));
    if (hdr) {
        hdr->bt_depth = get_backtrace(hdr->bt, MAX_BACKTRACE_DEPTH);
        add(hdr, size);
        return user(hdr);
    }

    return NULL;
}
Exemple #2
0
/* ENTRY POINT */
int main(int argc, char **argv)
{
    struct execute_context exec_ctx;
    pid_t c_pid;
    debug_printf(stderr,"start!\n");
    parse_opt(argc, argv, &exec_ctx);
    fprintf(stderr, "[Tracer] Target program is %s\n", exec_ctx.passing_args[0]);

    c_pid = fork();
    exec_ctx.target_pid = c_pid;
    if (c_pid == -1) {
        return -1;
    } else if(c_pid == 0) {
        target_proc(&exec_ctx);
    } else {
        debugger_proc(c_pid, &exec_ctx);
    }
    chk_free(exec_ctx.passing_args);
    return 0;
}
extern "C" void* chk_realloc(void* ptr, size_t size) {
//  log_message("%s: %s\n", __FILE__, __FUNCTION__);

    if (!ptr) {
        return chk_malloc(size);
    }

#ifdef REALLOC_ZERO_BYTES_FREE
    if (!size) {
        chk_free(ptr);
        return NULL;
    }
#endif

    hdr_t* hdr = meta(ptr);

    if (del(hdr) < 0) {
        uintptr_t bt[MAX_BACKTRACE_DEPTH];
        int depth = get_backtrace(bt, MAX_BACKTRACE_DEPTH);
        if (hdr->tag == BACKLOG_TAG) {
            log_message("+++ REALLOCATION %p SIZE %d OF FREED MEMORY!\n",
                       user(hdr), size, hdr->size);
            log_message("+++ ALLOCATION %p SIZE %d ALLOCATED HERE:\n",
                       user(hdr), hdr->size);
            log_backtrace(hdr->bt, hdr->bt_depth);
            /* hdr->freed_bt_depth should be nonzero here */
            log_message("+++ ALLOCATION %p SIZE %d FIRST FREED HERE:\n",
                       user(hdr), hdr->size);
            log_backtrace(hdr->freed_bt, hdr->freed_bt_depth);
            log_message("+++ ALLOCATION %p SIZE %d NOW BEING REALLOCATED HERE:\n",
                       user(hdr), hdr->size);
            log_backtrace(bt, depth);

             /* We take the memory out of the backlog and fall through so the
             * reallocation below succeeds.  Since we didn't really free it, we
             * can default to this behavior.
             */
            del_from_backlog(hdr);
        } else {
            log_message("+++ REALLOCATION %p SIZE %d IS CORRUPTED OR NOT ALLOCATED VIA TRACKER!\n",
                       user(hdr), size);
            log_backtrace(bt, depth);
            // just get a whole new allocation and leak the old one
            return dlrealloc(0, size);
            // return dlrealloc(user(hdr), size); // assuming it was allocated externally
        }
    }

    if (hdr->base != hdr) {
        // An allocation from memalign, so create another allocation and
        // copy the data out.
        void* newMem = dlmalloc(sizeof(hdr_t) + size + sizeof(ftr_t));
        if (newMem) {
            memcpy(newMem, hdr, sizeof(hdr_t) + hdr->size);
            dlfree(hdr->base);
            hdr = static_cast<hdr_t*>(newMem);
        } else {
            dlfree(hdr->base);
            hdr = NULL;
        }
    } else {
        hdr = static_cast<hdr_t*>(dlrealloc(hdr, sizeof(hdr_t) + size + sizeof(ftr_t)));
    }
    if (hdr) {
        hdr->base = hdr;
        hdr->bt_depth = get_backtrace(hdr->bt, MAX_BACKTRACE_DEPTH);
        add(hdr, size);
        return user(hdr);
    }

    return NULL;
}
Exemple #4
0
void cir_free()
{ str_cir_pt=lst_ok(str_cir_bs);
  while(str_cir_pt--) chk_free(str_cir_bs[str_cir_pt]);
  lfree(str_cir_bs);
}