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>, Su Yue <suy.fnst@cn.fujitsu.com>,
David Sterba <dsterba@suse.com>,
Ben Hutchings <ben.hutchings@codethink.co.uk>
Subject: [PATCH 4.4 29/51] btrfs: Check that each block group has corresponding chunk at mount time
Date: Tue, 15 Jan 2019 17:35:25 +0100 [thread overview]
Message-ID: <20190115154850.720466621@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 514c7dca85a0bf40be984dab0b477403a6db901f upstream.
A crafted btrfs image with incorrect chunk<->block group mapping will
trigger a lot of unexpected things as the mapping is essential.
Although the problem can be caught by block group item checker
added in "btrfs: tree-checker: Verify block_group_item", it's still not
sufficient. A sufficiently valid block group item can pass the check
added by the mentioned patch but could fail to match the existing chunk.
This patch will add extra block group -> chunk mapping check, to ensure
we have a completely matching (start, len, flags) chunk for each block
group at mount time.
Here we reuse the original helper find_first_block_group(), which is
already doing the basic bg -> chunk checks, adding further checks of the
start/len and type flags.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=199837
Reported-by: Xu Wen <wen.xu@gatech.edu>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Su Yue <suy.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
[bwh: Backported to 4.4: Use root->fs_info instead of fs_info]
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/btrfs/extent-tree.c | 28 +++++++++++++++++++++++++++-
1 file changed, 27 insertions(+), 1 deletion(-)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -9487,6 +9487,8 @@ static int find_first_block_group(struct
int ret = 0;
struct btrfs_key found_key;
struct extent_buffer *leaf;
+ struct btrfs_block_group_item bg;
+ u64 flags;
int slot;
ret = btrfs_search_slot(NULL, root, key, path, 0, 0);
@@ -9521,8 +9523,32 @@ static int find_first_block_group(struct
"logical %llu len %llu found bg but no related chunk",
found_key.objectid, found_key.offset);
ret = -ENOENT;
+ } else if (em->start != found_key.objectid ||
+ em->len != found_key.offset) {
+ btrfs_err(root->fs_info,
+ "block group %llu len %llu mismatch with chunk %llu len %llu",
+ found_key.objectid, found_key.offset,
+ em->start, em->len);
+ ret = -EUCLEAN;
} else {
- ret = 0;
+ read_extent_buffer(leaf, &bg,
+ btrfs_item_ptr_offset(leaf, slot),
+ sizeof(bg));
+ flags = btrfs_block_group_flags(&bg) &
+ BTRFS_BLOCK_GROUP_TYPE_MASK;
+
+ if (flags != (em->map_lookup->type &
+ BTRFS_BLOCK_GROUP_TYPE_MASK)) {
+ btrfs_err(root->fs_info,
+"block group %llu len %llu type flags 0x%llx mismatch with chunk type flags 0x%llx",
+ found_key.objectid,
+ found_key.offset, flags,
+ (BTRFS_BLOCK_GROUP_TYPE_MASK &
+ em->map_lookup->type));
+ ret = -EUCLEAN;
+ } else {
+ ret = 0;
+ }
}
free_extent_map(em);
goto out;
next prev parent reply other threads:[~2019-01-15 17:01 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 ` Greg Kroah-Hartman [this message]
2019-01-15 16:35 ` [PATCH 4.4 30/51] btrfs: Verify that every chunk has corresponding block group at mount time Greg Kroah-Hartman
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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