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Commit b05b0b5d authored by Ken Sumrall's avatar Ken Sumrall
Browse files

Crypto changes for devices that don't write ext4 fs on wipe 

This adds a new function to libcutils, partition_wiped().
This is used to determine if a partition is wiped.

Change-Id: Ibb388976c6b5bd3923b62d8f79b2b97748abf6c1
parent 1ffdb382

include/cutils/partition_utils.h

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+27 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2011, The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */



#ifndef __CUTILS_PARTITION_WIPED_H__

#define __CUTILS_PARTITION_WIPED_H__



__BEGIN_DECLS



int partition_wiped(char *source);

void erase_footer(const char *dev_path, long long size);



__END_DECLS



#endif /* __CUTILS_PARTITION_WIPED_H__ */

libcutils/Android.mk

+1 −1
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@@ -110,7 +110,7 @@ else #!sim 
# ========================================================

include $(CLEAR_VARS)

LOCAL_MODULE := libcutils

LOCAL_SRC_FILES := $(commonSources) ashmem-dev.c mq.c android_reboot.c uevent.c

LOCAL_SRC_FILES := $(commonSources) ashmem-dev.c mq.c android_reboot.c partition_utils.c uevent.c



ifeq ($(TARGET_ARCH),arm)

LOCAL_SRC_FILES += arch-arm/memset32.S

libcutils/partition_utils.c

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/*

 * Copyright 2011, The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */



#include <sys/types.h>

#include <unistd.h>

#include <fcntl.h>

#include <sys/stat.h>

#include <sys/ioctl.h>

#include <sys/mount.h> /* for BLKGETSIZE */

#include <cutils/properties.h>



static int only_one_char(char *buf, int len, char c)

{

    int i, ret;



    ret = 1;

    for (i=0; i<len; i++) {

        if (buf[i] != c) {

            ret = 0;

            break;

        }

    }

    return ret;

}



int partition_wiped(char *source)

{

    char buf[4096];

    int fd, ret, wiped;



    if ((fd = open(source, O_RDONLY)) < 0) {

        return 0;

    }



    ret = read(fd, buf, sizeof(buf));

    close(fd);



    if (ret != sizeof(buf)) {

        return 0;

    }



    /* Check for all zeros */

    if (only_one_char(buf, sizeof(buf), 0)) {

       return 1;

    }



    /* Check for all ones */

    if (only_one_char(buf, sizeof(buf), 0xff)) {

       return 1;

    }



    return 0;

}