graphene/Pal/src/host/Linux-SGX/enclave_untrusted.c

/* Copyright (C) 2014 Stony Brook University
   This file is part of Graphene Library OS.

   Graphene Library OS is free software: you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public License
   as published by the Free Software Foundation, either version 3 of the
   License, or (at your option) any later version.

   Graphene Library OS is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include <api.h>
#include <pal_error.h>
#include <pal_internal.h>
#include <pal_security.h>
#include <spinlock.h>

#include "enclave_ocalls.h"

static spinlock_t malloc_lock = INIT_SPINLOCK_UNLOCKED;
static size_t g_page_size   = PRESET_PAGESIZE;

#define SYSTEM_LOCK()   spinlock_lock(&malloc_lock)
#define SYSTEM_UNLOCK() spinlock_unlock(&malloc_lock)
#define SYSTEM_LOCKED() spinlock_is_locked(&malloc_lock)

#define ALLOC_ALIGNMENT g_page_size

static inline void* __malloc(int size) {
    void* addr = NULL;

    ocall_mmap_untrusted(-1, 0, size, PROT_READ | PROT_WRITE, &addr);
    return addr;
}

#define system_malloc(size) __malloc(size)

static inline void __free(void* addr, int size) {
    ocall_munmap_untrusted(addr, size);
}

#define system_free(addr, size) __free(addr, size)

#include "slabmgr.h"

static SLAB_MGR untrusted_slabmgr = NULL;

void init_untrusted_slab_mgr() {
    if (untrusted_slabmgr)
        return;

    untrusted_slabmgr = create_slab_mgr();
    if (!untrusted_slabmgr)
        INIT_FAIL(PAL_ERROR_NOMEM, "cannot initialize slab manager");
}

void* malloc_untrusted(int size) {
    return slab_alloc(untrusted_slabmgr, size);
}

void free_untrusted(void* ptr) {
    slab_free(untrusted_slabmgr, ptr);
}