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gpt: refuse to write to sector 0

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This commit is contained in:
Michael Marineau 2016-08-11 15:02:21 -07:00
parent 8278022a0b
commit c68fcd3b1a
1 changed files with 7 additions and 0 deletions
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7
grub-core/lib/gpt.c
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@ -626,10 +626,17 @@ grub_gpt_write_table (grub_disk_t disk, grub_gpt_t gpt,
sizeof (*header));
addr = grub_gpt_sector_to_addr (gpt, grub_le_to_cpu64 (header->header_lba));
if (addr == 0)
return grub_error (GRUB_ERR_BUG,
"Refusing to write GPT header to address 0x0");
if (grub_disk_write (disk, addr, 0, sizeof (*header), header))
return grub_errno;
addr = grub_gpt_sector_to_addr (gpt, grub_le_to_cpu64 (header->partitions));
if (addr < 2)
return grub_error (GRUB_ERR_BUG,
"Refusing to write GPT entries to address 0x%llx",
(unsigned long long) addr);
if (grub_disk_write (disk, addr, 0, gpt->entries_size, gpt->entries))
return grub_errno;