612 lines
18 KiB
C
612 lines
18 KiB
C
/*
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gpt.[ch]
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Copyright (C) 2000-2001 Dell Computer Corporation <Matt_Domsch@dell.com>
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EFI GUID Partition Table handling
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Per Intel EFI Specification v1.02
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http://developer.intel.com/technology/efi/efi.htm
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#define _FILE_OFFSET_BITS 64
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <asm/byteorder.h>
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#include "crc32.h"
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#include "gpt.h"
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#include "partx.h"
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#define BLKGETLASTSECT _IO(0x12,108) /* get last sector of block device */
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#define BLKGETSIZE _IO(0x12,96) /* return device size */
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#define BLKSSZGET _IO(0x12,104) /* get block device sector size */
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#define BLKGETSIZE64 _IOR(0x12,114,sizeof(uint64_t)) /* return device size in bytes (u64 *arg) */
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struct blkdev_ioctl_param {
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unsigned int block;
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size_t content_length;
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char * block_contents;
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};
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/**
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* efi_crc32() - EFI version of crc32 function
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* @buf: buffer to calculate crc32 of
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* @len - length of buf
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*
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* Description: Returns EFI-style CRC32 value for @buf
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*
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* This function uses the little endian Ethernet polynomial
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* but seeds the function with ~0, and xor's with ~0 at the end.
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* Note, the EFI Specification, v1.02, has a reference to
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* Dr. Dobbs Journal, May 1994 (actually it's in May 1992).
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*/
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static inline uint32_t
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efi_crc32(const void *buf, unsigned long len)
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{
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return (crc32(~0L, buf, len) ^ ~0L);
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}
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/**
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* is_pmbr_valid(): test Protective MBR for validity
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* @mbr: pointer to a legacy mbr structure
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*
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* Description: Returns 1 if PMBR is valid, 0 otherwise.
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* Validity depends on two things:
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* 1) MSDOS signature is in the last two bytes of the MBR
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* 2) One partition of type 0xEE is found
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*/
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static int
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is_pmbr_valid(legacy_mbr *mbr)
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{
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int i, found = 0, signature = 0;
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if (!mbr)
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return 0;
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signature = (__le16_to_cpu(mbr->signature) == MSDOS_MBR_SIGNATURE);
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for (i = 0; signature && i < 4; i++) {
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if (mbr->partition[i].sys_type ==
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EFI_PMBR_OSTYPE_EFI_GPT) {
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found = 1;
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break;
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}
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}
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return (signature && found);
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}
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/************************************************************
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* get_sector_size
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* Requires:
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* - filedes is an open file descriptor, suitable for reading
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* Modifies: nothing
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* Returns:
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* sector size, or 512.
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************************************************************/
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static int
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get_sector_size(int filedes)
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{
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int rc, sector_size = 512;
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rc = ioctl(filedes, BLKSSZGET, §or_size);
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if (rc)
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sector_size = 512;
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return sector_size;
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}
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/************************************************************
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* _get_num_sectors
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* Requires:
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* - filedes is an open file descriptor, suitable for reading
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* Modifies: nothing
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* Returns:
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* Last LBA value on success
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* 0 on error
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*
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* Try getting BLKGETSIZE64 and BLKSSZGET first,
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* then BLKGETSIZE if necessary.
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* Kernels 2.4.15-2.4.18 and 2.5.0-2.5.3 have a broken BLKGETSIZE64
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* which returns the number of 512-byte sectors, not the size of
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* the disk in bytes. Fixed in kernels 2.4.18-pre8 and 2.5.4-pre3.
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************************************************************/
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static uint64_t
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_get_num_sectors(int filedes)
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{
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unsigned long sectors=0;
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int rc;
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#if 0
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uint64_t bytes=0;
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rc = ioctl(filedes, BLKGETSIZE64, &bytes);
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if (!rc)
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return bytes / get_sector_size(filedes);
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#endif
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rc = ioctl(filedes, BLKGETSIZE, §ors);
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if (rc)
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return 0;
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return sectors;
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}
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/************************************************************
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* last_lba(): return number of last logical block of device
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*
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* @fd
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*
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* Description: returns Last LBA value on success, 0 on error.
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* Notes: The value st_blocks gives the size of the file
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* in 512-byte blocks, which is OK if
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* EFI_BLOCK_SIZE_SHIFT == 9.
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************************************************************/
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static uint64_t
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last_lba(int filedes)
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{
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int rc;
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uint64_t sectors = 0;
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struct stat s;
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memset(&s, 0, sizeof (s));
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rc = fstat(filedes, &s);
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if (rc == -1) {
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fprintf(stderr, "last_lba() could not stat: %s\n",
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strerror(errno));
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return 0;
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}
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if (S_ISBLK(s.st_mode)) {
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sectors = _get_num_sectors(filedes);
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} else {
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fprintf(stderr,
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"last_lba(): I don't know how to handle files with mode %x\n",
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s.st_mode);
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sectors = 1;
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}
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return sectors - 1;
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}
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static ssize_t
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read_lastoddsector(int fd, uint64_t lba, void *buffer, size_t count)
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{
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int rc;
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struct blkdev_ioctl_param ioctl_param;
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if (!buffer) return 0;
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ioctl_param.block = 0; /* read the last sector */
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ioctl_param.content_length = count;
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ioctl_param.block_contents = buffer;
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rc = ioctl(fd, BLKGETLASTSECT, &ioctl_param);
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if (rc == -1) perror("read failed");
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return !rc;
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}
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static ssize_t
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read_lba(int fd, uint64_t lba, void *buffer, size_t bytes)
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{
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int sector_size = get_sector_size(fd);
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off_t offset = lba * sector_size;
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ssize_t bytesread;
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lseek(fd, offset, SEEK_SET);
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bytesread = read(fd, buffer, bytes);
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/* Kludge. This is necessary to read/write the last
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block of an odd-sized disk, until Linux 2.5.x kernel fixes.
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This is only used by gpt.c, and only to read
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one sector, so we don't have to be fancy.
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*/
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if (!bytesread && !(last_lba(fd) & 1) && lba == last_lba(fd)) {
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bytesread = read_lastoddsector(fd, lba, buffer, bytes);
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}
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return bytesread;
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}
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/**
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* alloc_read_gpt_entries(): reads partition entries from disk
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* @fd is an open file descriptor to the whole disk
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* @gpt is a buffer into which the GPT will be put
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* Description: Returns ptes on success, NULL on error.
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* Allocates space for PTEs based on information found in @gpt.
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* Notes: remember to free pte when you're done!
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*/
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static gpt_entry *
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alloc_read_gpt_entries(int fd, gpt_header * gpt)
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{
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gpt_entry *pte;
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size_t count = __le32_to_cpu(gpt->num_partition_entries) *
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__le32_to_cpu(gpt->sizeof_partition_entry);
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if (!count) return NULL;
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pte = (gpt_entry *)malloc(count);
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if (!pte)
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return NULL;
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memset(pte, 0, count);
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if (!read_lba(fd, __le64_to_cpu(gpt->partition_entry_lba), pte,
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count)) {
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free(pte);
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return NULL;
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}
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return pte;
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}
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/**
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* alloc_read_gpt_header(): Allocates GPT header, reads into it from disk
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* @fd is an open file descriptor to the whole disk
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* @lba is the Logical Block Address of the partition table
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*
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* Description: returns GPT header on success, NULL on error. Allocates
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* and fills a GPT header starting at @ from @bdev.
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* Note: remember to free gpt when finished with it.
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*/
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static gpt_header *
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alloc_read_gpt_header(int fd, uint64_t lba)
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{
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gpt_header *gpt;
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gpt = (gpt_header *)
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malloc(sizeof (gpt_header));
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if (!gpt)
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return NULL;
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memset(gpt, 0, sizeof (*gpt));
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if (!read_lba(fd, lba, gpt, sizeof (gpt_header))) {
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free(gpt);
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return NULL;
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}
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return gpt;
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}
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/**
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* is_gpt_valid() - tests one GPT header and PTEs for validity
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* @fd is an open file descriptor to the whole disk
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* @lba is the logical block address of the GPT header to test
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* @gpt is a GPT header ptr, filled on return.
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* @ptes is a PTEs ptr, filled on return.
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*
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* Description: returns 1 if valid, 0 on error.
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* If valid, returns pointers to newly allocated GPT header and PTEs.
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*/
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static int
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is_gpt_valid(int fd, uint64_t lba,
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gpt_header ** gpt, gpt_entry ** ptes)
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{
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int rc = 0; /* default to not valid */
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uint32_t crc, origcrc;
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if (!gpt || !ptes)
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return 0;
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if (!(*gpt = alloc_read_gpt_header(fd, lba)))
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return 0;
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/* Check the GUID Partition Table signature */
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if (__le64_to_cpu((*gpt)->signature) != GPT_HEADER_SIGNATURE) {
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/*
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printf("GUID Partition Table Header signature is wrong: %" PRIx64" != %" PRIx64 "\n",
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__le64_to_cpu((*gpt)->signature), GUID_PT_HEADER_SIGNATURE);
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*/
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free(*gpt);
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*gpt = NULL;
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return rc;
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}
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/* Check the GUID Partition Table Header CRC */
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origcrc = __le32_to_cpu((*gpt)->header_crc32);
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(*gpt)->header_crc32 = 0;
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crc = efi_crc32(*gpt, __le32_to_cpu((*gpt)->header_size));
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if (crc != origcrc) {
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// printf( "GPTH CRC check failed, %x != %x.\n", origcrc, crc);
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(*gpt)->header_crc32 = __cpu_to_le32(origcrc);
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free(*gpt);
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*gpt = NULL;
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return 0;
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}
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(*gpt)->header_crc32 = __cpu_to_le32(origcrc);
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/* Check that the my_lba entry points to the LBA
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* that contains the GPT we read */
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if (__le64_to_cpu((*gpt)->my_lba) != lba) {
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// printf( "my_lba % PRIx64 "x != lba %"PRIx64 "x.\n", __le64_to_cpu((*gpt)->my_lba), lba);
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free(*gpt);
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*gpt = NULL;
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return 0;
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}
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if (!(*ptes = alloc_read_gpt_entries(fd, *gpt))) {
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free(*gpt);
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*gpt = NULL;
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return 0;
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}
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/* Check the GUID Partition Entry Array CRC */
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crc = efi_crc32(*ptes,
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__le32_to_cpu((*gpt)->num_partition_entries) *
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__le32_to_cpu((*gpt)->sizeof_partition_entry));
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if (crc != __le32_to_cpu((*gpt)->partition_entry_array_crc32)) {
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// printf("GUID Partitition Entry Array CRC check failed.\n");
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free(*gpt);
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*gpt = NULL;
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free(*ptes);
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*ptes = NULL;
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return 0;
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}
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/* We're done, all's well */
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return 1;
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}
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/**
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* compare_gpts() - Search disk for valid GPT headers and PTEs
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* @pgpt is the primary GPT header
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* @agpt is the alternate GPT header
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* @lastlba is the last LBA number
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* Description: Returns nothing. Sanity checks pgpt and agpt fields
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* and prints warnings on discrepancies.
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*
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*/
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static void
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compare_gpts(gpt_header *pgpt, gpt_header *agpt, uint64_t lastlba)
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{
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int error_found = 0;
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if (!pgpt || !agpt)
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return;
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if (__le64_to_cpu(pgpt->my_lba) != __le64_to_cpu(agpt->alternate_lba)) {
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fprintf(stderr,
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"GPT:Primary header LBA != Alt. header alternate_lba\n");
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fprintf(stderr, "GPT:%" PRIx64 "x != %" PRIx64 "x\n",
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__le64_to_cpu(pgpt->my_lba),
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__le64_to_cpu(agpt->alternate_lba));
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error_found++;
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}
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if (__le64_to_cpu(pgpt->alternate_lba) != __le64_to_cpu(agpt->my_lba)) {
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fprintf(stderr,
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"GPT:Primary header alternate_lba != Alt. header my_lba\n");
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fprintf(stderr, "GPT:%" PRIx64 " != %" PRIx64 "\n",
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__le64_to_cpu(pgpt->alternate_lba),
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__le64_to_cpu(agpt->my_lba));
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error_found++;
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}
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if (__le64_to_cpu(pgpt->first_usable_lba) !=
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__le64_to_cpu(agpt->first_usable_lba)) {
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fprintf(stderr, "GPT:first_usable_lbas don't match.\n");
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fprintf(stderr, "GPT:%" PRIx64 " != %" PRIx64 "\n",
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__le64_to_cpu(pgpt->first_usable_lba),
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__le64_to_cpu(agpt->first_usable_lba));
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error_found++;
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}
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if (__le64_to_cpu(pgpt->last_usable_lba) !=
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__le64_to_cpu(agpt->last_usable_lba)) {
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fprintf(stderr, "GPT:last_usable_lbas don't match.\n");
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fprintf(stderr, "GPT:%" PRIx64 " != %" PRIx64 "\n",
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__le64_to_cpu(pgpt->last_usable_lba),
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__le64_to_cpu(agpt->last_usable_lba));
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error_found++;
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}
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if (efi_guidcmp(pgpt->disk_guid, agpt->disk_guid)) {
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fprintf(stderr, "GPT:disk_guids don't match.\n");
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error_found++;
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}
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if (__le32_to_cpu(pgpt->num_partition_entries) !=
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__le32_to_cpu(agpt->num_partition_entries)) {
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fprintf(stderr, "GPT:num_partition_entries don't match: "
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"0x%x != 0x%x\n",
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__le32_to_cpu(pgpt->num_partition_entries),
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__le32_to_cpu(agpt->num_partition_entries));
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error_found++;
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}
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if (__le32_to_cpu(pgpt->sizeof_partition_entry) !=
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__le32_to_cpu(agpt->sizeof_partition_entry)) {
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fprintf(stderr,
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"GPT:sizeof_partition_entry values don't match: "
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"0x%x != 0x%x\n",
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__le32_to_cpu(pgpt->sizeof_partition_entry),
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__le32_to_cpu(agpt->sizeof_partition_entry));
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error_found++;
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}
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if (__le32_to_cpu(pgpt->partition_entry_array_crc32) !=
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__le32_to_cpu(agpt->partition_entry_array_crc32)) {
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fprintf(stderr,
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"GPT:partition_entry_array_crc32 values don't match: "
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"0x%x != 0x%x\n",
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__le32_to_cpu(pgpt->partition_entry_array_crc32),
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__le32_to_cpu(agpt->partition_entry_array_crc32));
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error_found++;
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}
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if (__le64_to_cpu(pgpt->alternate_lba) != lastlba) {
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fprintf(stderr,
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"GPT:Primary header thinks Alt. header is not at the end of the disk.\n");
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fprintf(stderr, "GPT:%" PRIx64 " != %" PRIx64 "\n",
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__le64_to_cpu(pgpt->alternate_lba), lastlba);
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error_found++;
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}
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if (__le64_to_cpu(agpt->my_lba) != lastlba) {
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fprintf(stderr,
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"GPT:Alternate GPT header not at the end of the disk.\n");
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fprintf(stderr, "GPT:%" PRIx64 " != %" PRIx64 "\n",
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__le64_to_cpu(agpt->my_lba), lastlba);
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error_found++;
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}
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if (error_found)
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fprintf(stderr,
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"GPT: Use GNU Parted to correct GPT errors.\n");
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return;
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}
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/**
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* find_valid_gpt() - Search disk for valid GPT headers and PTEs
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* @fd is an open file descriptor to the whole disk
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* @gpt is a GPT header ptr, filled on return.
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* @ptes is a PTEs ptr, filled on return.
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* Description: Returns 1 if valid, 0 on error.
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* If valid, returns pointers to newly allocated GPT header and PTEs.
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* Validity depends on finding either the Primary GPT header and PTEs valid,
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* or the Alternate GPT header and PTEs valid, and the PMBR valid.
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*/
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static int
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find_valid_gpt(int fd, gpt_header ** gpt, gpt_entry ** ptes)
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{
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extern int force_gpt;
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int good_pgpt = 0, good_agpt = 0, good_pmbr = 0;
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gpt_header *pgpt = NULL, *agpt = NULL;
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gpt_entry *pptes = NULL, *aptes = NULL;
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legacy_mbr *legacymbr = NULL;
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|
uint64_t lastlba;
|
|
if (!gpt || !ptes)
|
|
return 0;
|
|
|
|
lastlba = last_lba(fd);
|
|
good_pgpt = is_gpt_valid(fd, GPT_PRIMARY_PARTITION_TABLE_LBA,
|
|
&pgpt, &pptes);
|
|
if (good_pgpt) {
|
|
good_agpt = is_gpt_valid(fd,
|
|
__le64_to_cpu(pgpt->alternate_lba),
|
|
&agpt, &aptes);
|
|
if (!good_agpt) {
|
|
good_agpt = is_gpt_valid(fd, lastlba,
|
|
&agpt, &aptes);
|
|
}
|
|
}
|
|
else {
|
|
good_agpt = is_gpt_valid(fd, lastlba,
|
|
&agpt, &aptes);
|
|
}
|
|
|
|
/* The obviously unsuccessful case */
|
|
if (!good_pgpt && !good_agpt) {
|
|
goto fail;
|
|
}
|
|
|
|
/* This will be added to the EFI Spec. per Intel after v1.02. */
|
|
legacymbr = malloc(sizeof (*legacymbr));
|
|
if (legacymbr) {
|
|
memset(legacymbr, 0, sizeof (*legacymbr));
|
|
read_lba(fd, 0, (uint8_t *) legacymbr,
|
|
sizeof (*legacymbr));
|
|
good_pmbr = is_pmbr_valid(legacymbr);
|
|
free(legacymbr);
|
|
legacymbr=NULL;
|
|
}
|
|
|
|
/* Failure due to bad PMBR */
|
|
if ((good_pgpt || good_agpt) && !good_pmbr && !force_gpt) {
|
|
fprintf(stderr,
|
|
" Warning: Disk has a valid GPT signature "
|
|
"but invalid PMBR.\n"
|
|
" Assuming this disk is *not* a GPT disk anymore.\n"
|
|
" Use gpt kernel option to override. "
|
|
"Use GNU Parted to correct disk.\n");
|
|
goto fail;
|
|
}
|
|
|
|
/* Would fail due to bad PMBR, but force GPT anyhow */
|
|
if ((good_pgpt || good_agpt) && !good_pmbr && force_gpt) {
|
|
fprintf(stderr,
|
|
" Warning: Disk has a valid GPT signature but "
|
|
"invalid PMBR.\n"
|
|
" Use GNU Parted to correct disk.\n"
|
|
" gpt option taken, disk treated as GPT.\n");
|
|
}
|
|
|
|
compare_gpts(pgpt, agpt, lastlba);
|
|
|
|
/* The good cases */
|
|
if (good_pgpt && (good_pmbr || force_gpt)) {
|
|
*gpt = pgpt;
|
|
*ptes = pptes;
|
|
if (agpt) { free(agpt); agpt = NULL; }
|
|
if (aptes) { free(aptes); aptes = NULL; }
|
|
if (!good_agpt) {
|
|
fprintf(stderr,
|
|
"Alternate GPT is invalid, "
|
|
"using primary GPT.\n");
|
|
}
|
|
return 1;
|
|
}
|
|
else if (good_agpt && (good_pmbr || force_gpt)) {
|
|
*gpt = agpt;
|
|
*ptes = aptes;
|
|
if (pgpt) { free(pgpt); pgpt = NULL; }
|
|
if (pptes) { free(pptes); pptes = NULL; }
|
|
fprintf(stderr,
|
|
"Primary GPT is invalid, using alternate GPT.\n");
|
|
return 1;
|
|
}
|
|
|
|
fail:
|
|
if (pgpt) { free(pgpt); pgpt=NULL; }
|
|
if (agpt) { free(agpt); agpt=NULL; }
|
|
if (pptes) { free(pptes); pptes=NULL; }
|
|
if (aptes) { free(aptes); aptes=NULL; }
|
|
*gpt = NULL;
|
|
*ptes = NULL;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* read_gpt_pt()
|
|
* @fd
|
|
* @all - slice with start/size of whole disk
|
|
*
|
|
* 0 if this isn't our partition table
|
|
* number of partitions if successful
|
|
*
|
|
*/
|
|
int
|
|
read_gpt_pt (int fd, struct slice all, struct slice *sp, int ns)
|
|
{
|
|
gpt_header *gpt = NULL;
|
|
gpt_entry *ptes = NULL;
|
|
uint32_t i;
|
|
int n = 0;
|
|
int last_used_index=-1;
|
|
|
|
if (!find_valid_gpt (fd, &gpt, &ptes) || !gpt || !ptes) {
|
|
if (gpt)
|
|
free (gpt);
|
|
if (ptes)
|
|
free (ptes);
|
|
return 0;
|
|
}
|
|
|
|
for (i = 0; i < __le32_to_cpu(gpt->num_partition_entries) && i < ns; i++) {
|
|
if (!efi_guidcmp (NULL_GUID, ptes[i].partition_type_guid)) {
|
|
sp[n].start = 0;
|
|
sp[n].size = 0;
|
|
n++;
|
|
} else {
|
|
sp[n].start = __le64_to_cpu(ptes[i].starting_lba);
|
|
sp[n].size = __le64_to_cpu(ptes[i].ending_lba) -
|
|
__le64_to_cpu(ptes[i].starting_lba) + 1;
|
|
last_used_index=n;
|
|
n++;
|
|
}
|
|
}
|
|
free (ptes);
|
|
free (gpt);
|
|
return last_used_index+1;
|
|
}
|