You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
49 lines
1.5 KiB
49 lines
1.5 KiB
From a8cc95de74ccc3ad090e8062ac335c844f13c9f4 Mon Sep 17 00:00:00 2001
|
|
From: Daniel Axtens <dja@axtens.net>
|
|
Date: Thu, 21 Jan 2021 17:59:14 +1100
|
|
Subject: [PATCH] disk/lvm: Don't go beyond the end of the data we read from
|
|
disk
|
|
|
|
We unconditionally trusted offset_xl from the LVM label header, even if
|
|
it told us that the PV header/disk locations were way off past the end
|
|
of the data we read from disk.
|
|
|
|
Require that the offset be sane, fixing an OOB read and crash.
|
|
|
|
Fixes: CID 314367, CID 314371
|
|
|
|
Signed-off-by: Daniel Axtens <dja@axtens.net>
|
|
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
|
|
Signed-off-by: Stefan Sørensen <stefan.sorensen@spectralink.com>
|
|
---
|
|
grub-core/disk/lvm.c | 14 ++++++++++++++
|
|
1 file changed, 14 insertions(+)
|
|
|
|
diff --git a/grub-core/disk/lvm.c b/grub-core/disk/lvm.c
|
|
index 139fafd..8136122 100644
|
|
--- a/grub-core/disk/lvm.c
|
|
+++ b/grub-core/disk/lvm.c
|
|
@@ -141,6 +141,20 @@ grub_lvm_detect (grub_disk_t disk,
|
|
goto fail;
|
|
}
|
|
|
|
+ /*
|
|
+ * We read a grub_lvm_pv_header and then 2 grub_lvm_disk_locns that
|
|
+ * immediately follow the PV header. Make sure we have space for both.
|
|
+ */
|
|
+ if (grub_le_to_cpu32 (lh->offset_xl) >=
|
|
+ GRUB_LVM_LABEL_SIZE - sizeof (struct grub_lvm_pv_header) -
|
|
+ 2 * sizeof (struct grub_lvm_disk_locn))
|
|
+ {
|
|
+#ifdef GRUB_UTIL
|
|
+ grub_util_info ("LVM PV header/disk locations are beyond the end of the block");
|
|
+#endif
|
|
+ goto fail;
|
|
+ }
|
|
+
|
|
pvh = (struct grub_lvm_pv_header *) (buf + grub_le_to_cpu32(lh->offset_xl));
|
|
|
|
for (i = 0, j = 0; i < GRUB_LVM_ID_LEN; i++)
|
|
--
|
|
2.14.2
|
|
|
|
|