vbatts/grub
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2008-10-05 Hans Lambermont <hans@lambermont.dyndns.org>

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* disk/lvm.c (grub_lvm_scan_device): Allocate buffer space for the
        circular metadata worst case scenario. If the metadata is circular
        then copy the wrap in place.
        * include/grub/lvm.h: Add GRUB_LVM_MDA_HEADER_SIZE, from the LVM2
        project lib/format_text/layout.h
        Circular metadata bug found and patch debugged by Jan Derk Gerlings.
This commit is contained in:
robertmh 2008-10-05 10:51:23 +00:00
parent 7a36edcafd
commit 1b7748eb13
3 changed files with 22 additions and 1 deletions
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13
disk/lvm.c
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@ -281,7 +281,8 @@ grub_lvm_scan_device (const char *name)
goto fail;
}
metadatabuf = grub_malloc (mda_size);
/* Allocate buffer space for the circular worst-case scenario. */
metadatabuf = grub_malloc (2 * mda_size);
if (! metadatabuf)
goto fail;
@ -300,6 +301,16 @@ grub_lvm_scan_device (const char *name)
}
rlocn = mdah->raw_locns;
if (grub_le_to_cpu64 (rlocn->offset) + grub_le_to_cpu64 (rlocn->size) >
grub_le_to_cpu64 (mdah->size))
{
/* Metadata is circular. Copy the wrap in place. */
grub_memcpy (metadatabuf + mda_size,
metadatabuf + GRUB_LVM_MDA_HEADER_SIZE,
grub_le_to_cpu64 (rlocn->offset) +
grub_le_to_cpu64 (rlocn->size) -
grub_le_to_cpu64 (mdah->size));
}
p = q = metadatabuf + grub_le_to_cpu64 (rlocn->offset);
while (*q != ' ' && q < metadatabuf + mda_size)