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