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disk: gpt: verify alternate LBA points to last usable LBA

The gpt command require the GPT backup header at the standard location
at the end of the device. Check the alternate LBA value before reading
the GPT backup header from the last usable LBA of the device.

Signed-off-by: Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Stefan Herbrechtsmeier преди 3 години
родител
ревизия
d46933839f
променени са 1 файла, в които са добавени 9 реда и са изтрити 0 реда
  1. 9 0
      disk/part_efi.c

+ 9 - 0
disk/part_efi.c

@@ -692,6 +692,15 @@ int gpt_verify_headers(struct blk_desc *dev_desc, gpt_header *gpt_head,
 	/* Free pte before allocating again */
 	free(*gpt_pte);
 
+	/*
+	 * Check that the alternate_lba entry points to the last LBA
+	 */
+	if (le64_to_cpu(gpt_head->alternate_lba) != (dev_desc->lba - 1)) {
+		printf("%s: *** ERROR: Misplaced Backup GPT ***\n",
+		       __func__);
+		return -1;
+	}
+
 	if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
 			 gpt_head, gpt_pte) != 1) {
 		printf("%s: *** ERROR: Invalid Backup GPT ***\n",