From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Xu Wen <wen.xu@gatech.edu>,
Qu Wenruo <wqu@suse.com>, Gu Jinxiang <gujx@cn.fujitsu.com>,
David Sterba <dsterba@suse.com>,
Ben Hutchings <ben.hutchings@codethink.co.uk>
Subject: [PATCH 4.4 30/51] btrfs: Verify that every chunk has corresponding block group at mount time
Date: Tue, 15 Jan 2019 17:35:26 +0100 [thread overview]
Message-ID: <20190115154850.828189872@linuxfoundation.org> (raw)
In-Reply-To: <20190115154846.928796000@linuxfoundation.org>
4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Qu Wenruo <wqu@suse.com>
commit 7ef49515fa6727cb4b6f2f5b0ffbc5fc20a9f8c6 upstream.
If a crafted image has missing block group items, it could cause
unexpected behavior and breaks the assumption of 1:1 chunk<->block group
mapping.
Although we have the block group -> chunk mapping check, we still need
chunk -> block group mapping check.
This patch will do extra check to ensure each chunk has its
corresponding block group.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=199847
Reported-by: Xu Wen <wen.xu@gatech.edu>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Gu Jinxiang <gujx@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
[bwh: Backported to 4.4: adjust context]
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/btrfs/extent-tree.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 57 insertions(+), 1 deletion(-)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -9765,6 +9765,62 @@ btrfs_create_block_group_cache(struct bt
return cache;
}
+
+/*
+ * Iterate all chunks and verify that each of them has the corresponding block
+ * group
+ */
+static int check_chunk_block_group_mappings(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
+ struct extent_map *em;
+ struct btrfs_block_group_cache *bg;
+ u64 start = 0;
+ int ret = 0;
+
+ while (1) {
+ read_lock(&map_tree->map_tree.lock);
+ /*
+ * lookup_extent_mapping will return the first extent map
+ * intersecting the range, so setting @len to 1 is enough to
+ * get the first chunk.
+ */
+ em = lookup_extent_mapping(&map_tree->map_tree, start, 1);
+ read_unlock(&map_tree->map_tree.lock);
+ if (!em)
+ break;
+
+ bg = btrfs_lookup_block_group(fs_info, em->start);
+ if (!bg) {
+ btrfs_err(fs_info,
+ "chunk start=%llu len=%llu doesn't have corresponding block group",
+ em->start, em->len);
+ ret = -EUCLEAN;
+ free_extent_map(em);
+ break;
+ }
+ if (bg->key.objectid != em->start ||
+ bg->key.offset != em->len ||
+ (bg->flags & BTRFS_BLOCK_GROUP_TYPE_MASK) !=
+ (em->map_lookup->type & BTRFS_BLOCK_GROUP_TYPE_MASK)) {
+ btrfs_err(fs_info,
+"chunk start=%llu len=%llu flags=0x%llx doesn't match block group start=%llu len=%llu flags=0x%llx",
+ em->start, em->len,
+ em->map_lookup->type & BTRFS_BLOCK_GROUP_TYPE_MASK,
+ bg->key.objectid, bg->key.offset,
+ bg->flags & BTRFS_BLOCK_GROUP_TYPE_MASK);
+ ret = -EUCLEAN;
+ free_extent_map(em);
+ btrfs_put_block_group(bg);
+ break;
+ }
+ start = em->start + em->len;
+ free_extent_map(em);
+ btrfs_put_block_group(bg);
+ }
+ return ret;
+}
+
int btrfs_read_block_groups(struct btrfs_root *root)
{
struct btrfs_path *path;
@@ -9951,7 +10007,7 @@ int btrfs_read_block_groups(struct btrfs
}
init_global_block_rsv(info);
- ret = 0;
+ ret = check_chunk_block_group_mappings(info);
error:
btrfs_free_path(path);
return ret;
next prev parent reply other threads:[~2019-01-15 16:37 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-15 16:34 [PATCH 4.4 00/51] 4.4.171-stable review Greg Kroah-Hartman
2019-01-15 16:34 ` [PATCH 4.4 01/51] ALSA: hda/realtek - Disable headset Mic VREF for headset mode of ALC225 Greg Kroah-Hartman
2019-01-15 16:34 ` [PATCH 4.4 02/51] btrfs: cleanup, stop casting for extent_map->lookup everywhere Greg Kroah-Hartman
2019-01-15 16:34 ` [PATCH 4.4 03/51] btrfs: Enhance chunk validation check Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 04/51] Btrfs: add validadtion checks for chunk loading Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 05/51] Btrfs: check inconsistence between chunk and block group Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 06/51] Btrfs: fix em leak in find_first_block_group Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 07/51] Btrfs: detect corruption when non-root leaf has zero item Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 08/51] Btrfs: check btree nodes nritems Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 09/51] Btrfs: fix BUG_ON in btrfs_mark_buffer_dirty Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 10/51] Btrfs: memset to avoid stale content in btree node block Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 11/51] Btrfs: improve check_node to avoid reading corrupted nodes Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 12/51] Btrfs: kill BUG_ON in run_delayed_tree_ref Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 13/51] Btrfs: memset to avoid stale content in btree leaf Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 14/51] Btrfs: fix emptiness check for dirtied extent buffers at check_leaf() Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 15/51] btrfs: struct-funcs, constify readers Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 16/51] btrfs: Refactor check_leaf function for later expansion Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 17/51] btrfs: Check if item pointer overlaps with the item itself Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 18/51] btrfs: Add sanity check for EXTENT_DATA when reading out leaf Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 19/51] btrfs: Add checker for EXTENT_CSUM Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 20/51] btrfs: Move leaf and node validation checker to tree-checker.c Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 21/51] btrfs: tree-checker: Enhance btrfs_check_node output Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 22/51] btrfs: tree-checker: Fix false panic for sanity test Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 23/51] btrfs: tree-checker: Add checker for dir item Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 24/51] btrfs: tree-checker: use %zu format string for size_t Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 25/51] btrfs: tree-check: reduce stack consumption in check_dir_item Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 26/51] btrfs: tree-checker: Verify block_group_item Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 27/51] btrfs: tree-checker: Detect invalid and empty essential trees Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 28/51] btrfs: validate type when reading a chunk Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 29/51] btrfs: Check that each block group has corresponding chunk at mount time Greg Kroah-Hartman
2019-01-15 16:35 ` Greg Kroah-Hartman [this message]
2019-01-15 16:35 ` [PATCH 4.4 31/51] btrfs: tree-checker: Check level for leaves and nodes Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 32/51] btrfs: tree-checker: Fix misleading group system information Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 33/51] CIFS: Do not hide EINTR after sending network packets Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 34/51] cifs: Fix potential OOB access of lock element array Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 35/51] usb: cdc-acm: send ZLP for Telit 3G Intel based modems Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 36/51] USB: storage: dont insert sane sense for SPC3+ when bad sense specified Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 37/51] USB: storage: add quirk for SMI SM3350 Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 38/51] USB: Add USB_QUIRK_DELAY_CTRL_MSG quirk for Corsair K70 RGB Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 39/51] slab: alien caches must not be initialized if the allocation of the alien cache failed Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 40/51] PCI: altera: Fix altera_pcie_link_is_up() Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 41/51] PCI: altera: Reorder read/write functions Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 42/51] PCI: altera: Check link status before retrain link Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 43/51] PCI: altera: Poll for link up status after retraining the link Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 44/51] PCI: altera: Poll for link training " Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 45/51] PCI: altera: Rework config accessors for use without a struct pci_bus Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 46/51] PCI: altera: Move retrain from fixup to altera_pcie_host_init() Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 47/51] ACPI: power: Skip duplicate power resource references in _PRx Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 48/51] i2c: dev: prevent adapter retries and timeout being set as minus value Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 49/51] crypto: cts - fix crash on short inputs Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 50/51] ext4: fix a potential fiemap/page fault deadlock w/ inline_data Greg Kroah-Hartman
2019-01-15 16:35 ` [PATCH 4.4 51/51] sunrpc: use-after-free in svc_process_common() Greg Kroah-Hartman
2019-01-16 1:24 ` [PATCH 4.4 00/51] 4.4.171-stable review shuah
2019-01-16 11:55 ` Naresh Kamboju
2019-01-16 20:36 ` Guenter Roeck
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