|
|
|
|
From 7e1c9da4773237e368bdc0539ef91d55ef19806c Mon Sep 17 00:00:00 2001
|
|
|
|
|
From: Tobias Stoeckmann <tobias@stoeckmann.org>
|
|
|
|
|
Date: Sun, 28 Aug 2016 21:15:59 +0200
|
|
|
|
|
Subject: [PATCH 114/116] libblkid: Avoid OOB access on illegal ZFS superblocks
|
|
|
|
|
|
|
|
|
|
64 bit systems can trigger an out of boundary access while performing
|
|
|
|
|
a ZFS superblock probe.
|
|
|
|
|
|
|
|
|
|
This happens due to a possible integer overflow while calculating
|
|
|
|
|
the remaining available bytes. The variable is of type "int" and the
|
|
|
|
|
string length is allowed to be larger than INT_MAX, which means that
|
|
|
|
|
avail calculation can overflow, circumventing the "avail < 0" check and
|
|
|
|
|
therefore accessing memory outside the "buff" array later on.
|
|
|
|
|
|
|
|
|
|
[kzak@redhat.com (rhel7): - remove unused swab_magic]
|
|
|
|
|
|
|
|
|
|
Upstream: https://github.com/karelzak/util-linux/commit/8fa57ab0b5696031da800e243def32bc5265ff6d
|
|
|
|
|
Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1392661
|
|
|
|
|
Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>
|
|
|
|
|
Signed-off-by: Karel Zak <kzak@redhat.com>
|
|
|
|
|
---
|
|
|
|
|
libblkid/src/superblocks/zfs.c | 3 +--
|
|
|
|
|
1 file changed, 1 insertion(+), 2 deletions(-)
|
|
|
|
|
|
|
|
|
|
diff --git a/libblkid/src/superblocks/zfs.c b/libblkid/src/superblocks/zfs.c
|
|
|
|
|
index ff12fa6..2c7b4b7 100644
|
|
|
|
|
--- a/libblkid/src/superblocks/zfs.c
|
|
|
|
|
+++ b/libblkid/src/superblocks/zfs.c
|
|
|
|
|
@@ -115,7 +115,7 @@ static void zfs_extract_guid_name(blkid_probe pr, loff_t offset)
|
|
|
|
|
|
|
|
|
|
nvs->nvs_type = be32_to_cpu(nvs->nvs_type);
|
|
|
|
|
nvs->nvs_strlen = be32_to_cpu(nvs->nvs_strlen);
|
|
|
|
|
- if (nvs->nvs_strlen > UINT_MAX - sizeof(*nvs))
|
|
|
|
|
+ if (nvs->nvs_strlen > INT_MAX - sizeof(*nvs))
|
|
|
|
|
break;
|
|
|
|
|
avail -= nvs->nvs_strlen + sizeof(*nvs);
|
|
|
|
|
nvdebug("nvstring: type %u string %*s\n", nvs->nvs_type,
|
|
|
|
|
@@ -201,7 +201,6 @@ static int find_uberblocks(const void *label, loff_t *ub_offset, int *swap_endia
|
|
|
|
|
* #4 (@ 132kB) is the first one written on a new filesystem. */
|
|
|
|
|
static int probe_zfs(blkid_probe pr, const struct blkid_idmag *mag)
|
|
|
|
|
{
|
|
|
|
|
- uint64_t swab_magic = swab64(UBERBLOCK_MAGIC);
|
|
|
|
|
int swab_endian = 0;
|
|
|
|
|
struct zfs_uberblock *ub;
|
|
|
|
|
loff_t offset, ub_offset = 0;
|
|
|
|
|
--
|
|
|
|
|
2.9.3
|
|
|
|
|
|
