- 14 Feb, 2011 4 commits
-
-
Dan Rosenberg authored
Commit bf5fc093 refactored btrfs_ioctl_space_info() and introduced several security issues. space_args.space_slots is an unsigned 64-bit type controlled by a possibly unprivileged caller. The comparison as a signed int type allows providing values that are treated as negative and cause the subsequent allocation size calculation to wrap, or be truncated to 0. By providing a size that's truncated to 0, kmalloc() will return ZERO_SIZE_PTR. It's also possible to provide a value smaller than the slot count. The subsequent loop ignores the allocation size when copying data in, resulting in a heap overflow or write to ZERO_SIZE_PTR. The fix changes the slot count type and comparison typecast to u64, which prevents truncation or signedness errors, and also ensures that we don't copy more data than we've allocated in the subsequent loop. Note that zero-size allocations are no longer possible since there is already an explicit check for space_args.space_slots being 0 and truncation of this value is no longer an issue. Signed-off-by:
Dan Rosenberg <drosenberg@vsecurity.com> Signed-off-by:
Josef Bacik <josef@redhat.com> Reviewed-by:
Chris Mason <chris.mason@oracle.com>
-
Yan, Zheng authored
Mark the cloned backref_node as checked in clone_backref_node() Signed-off-by:
Yan, Zheng <zheng.z.yan@intel.com> Signed-off-by:
-
Chris Mason authored
Btrfs tracks uptodate state in an rbtree as well as in the page bits. This is supposed to enable us to use block sizes other than the page size, but there are a few parts still missing before that completely works. But, our readpage routine trusts this additional range based tracking of uptodateness, much in the same way the buffer head up to date bits are trusted for the other filesystems. The problem is that sometimes we need to allocate memory in order to split records in the rbtree, even when we are just clearing bits. This can be difficult when our clearing function is called GFP_ATOMIC, which can happen in the releasepage path. So, what happens today looks like this: releasepage called with GFP_ATOMIC btrfs_releasepage calls clear_extent_bit clear_extent_bit fails to allocate ram, leaving the up to date bit set btrfs_releasepage returns success The end result is the page being gone, but btrfs thinking the range is up to date. Later on if someone tries to read that same page, the btrfs readpage code will return immediately thinking the page is already up to date. This commit fixes things to fail the releasepage when we can't clear the extent state bits. It covers both data pages and metadata tree blocks. Signed-off-by: -
Chris Mason authored
There is a race where btrfs_releasepage can drop the page->private contents just as alloc_extent_buffer is setting up pages for metadata. Because of how the Btrfs page flags work, this results in us skipping the crc on the page during IO. This patch sovles the race by waiting until after the extent buffer is inserted into the radix tree before it sets page private. Signed-off-by:
-
- 07 Feb, 2011 1 commit
-
-
Yan, Zheng authored
take offset of start position into account when calculating page count. Signed-off-by:
-
- 06 Feb, 2011 4 commits
-
-
Alexey Charkov authored
As this function is called in some error paths while not removing the module, the __exit attribute prevents the kernel image from linking when btrfs is compiled in statically. Signed-off-by:
Alexey Charkov <alchark@gmail.com> Signed-off-by:
-
Tsutomu Itoh authored
When btrfs_alloc_path() fails, btrfs_free_path() need not be called. Therefore, it changes the branch ahead. Signed-off-by:
Tsutomu Itoh <t-itoh@jp.fujitsu.com> Signed-off-by:
-
Josef Bacik authored
This has been resulting in a BUT_ON(ret) after btrfs_reserve_extent in btrfs_cow_file_range. The reason is we don't actually calculate the bytes_super for a block group until we go to cache it, which means that the space_info can hand out reservations for space that it doesn't actually have, and we can run out of data space. This is also a problem if you are using space caching since we don't ever calculate bytes_super for the block groups. So instead everytime we read a block group call exclude_super_stripes, which calculates the bytes_super for the block group so it can be left out of the space_info. Then whenever caching completes we just call free_excluded_extents so that the super excluded extents are freed up. Also if we are unmounting and we hit any block groups that haven't been cached we still need to call free_excluded_extents to make sure things are cleaned up properly. Thanks, Reported-by:
Arne Jansen <sensille@gmx.net> Signed-off-by:
-
Josef Bacik authored
When we're cleaning up the tree log we need to be able to remove free space from the block group. The problem is if that free space spans bitmaps we would not find the space since we're looking for too many bytes. So make sure the amount of bytes we search for is limited to either the number of bytes we want, or the number of bytes left in the bitmap. This was tested by a user who was hitting the BUG() after search_bitmap. With this patch he can now mount his fs. Thanks, Signed-off-by:
-
- 01 Feb, 2011 3 commits
-
-
Tsutomu Itoh authored
The error check of btrfs_start_transaction() is added, and the mistake of the error check on several places is corrected. Signed-off-by:
-
Tsutomu Itoh authored
Because NULL is returned when the memory allocation fails, it is checked whether it is NULL. Signed-off-by:
-
Chris Mason authored
This one isn't really an uninit variable, but for pretty obscure reasons. Let's make it clearly correct. Signed-off-by:
-
- 31 Jan, 2011 2 commits
-
-
Chris Mason authored
btrfs_sync_log returns -EAGAIN when we need full transaction commits instead of small log commits, but sometimes we were dropping the return value. In practice, we check for this a few different ways, but this is still a bug that can leave off full log commits when we really need them. Signed-off-by: -
Josef Bacik authored
Xfstests 224 will just sit there and spin for ever until eventually we give up flushing delalloc and exit. On my box this took several hours. I could not interrupt this process either, even though we use INTERRUPTIBLE. So do 2 things 1) Keep us from looping over and over again without reclaiming anything 2) If we get interrupted exit the loop I tested this and the test now exits in a reasonable amount of time, and can be interrupted with ctrl+c. Thanks, Signed-off-by:
-
- 28 Jan, 2011 12 commits
-
-
Josef Bacik authored
Instead of doing a BUG_ON(1) in prepare_pages if grab_cache_page() fails, just loop through the pages we've already grabbed and unlock and release them, then return -ENOMEM like we should. Thanks, Signed-off-by:
-
Josef Bacik authored
Got a report of a box panicing because we got a NULL eb in read_extent_buffer. His fs was borked and btrfs_search_path returned EIO, but we don't check for errors so the box paniced. Yes I know this will just make something higher up the stack panic, but that's a problem for future Josef. Thanks, Signed-off-by:
-
Josef Bacik authored
We call use_block_rsv right before we make an allocation in order to make sure we have enough space. Now normally people have called btrfs_start_transaction() with the appropriate amount of space that we need, so we just use some of that pre-reserved space and move along happily. The problem is where people use btrfs_join_transaction(), which doesn't actually reserve any space. So we try and reserve space here, but we cannot flush delalloc, so this forces us to return -ENOSPC when in reality we have plenty of space. The most common symptom is seeing a bunch of "couldn't dirty inode" messages in syslog. With xfstests 224 we end up falling back to start_transaction and then doing all the flush delalloc stuff which causes to hang for a very long time. So instead steal from the global reserve, which is what this is meant for anyway. With this patch and the other 2 I have sent xfstests 224 now passes successfully. Thanks, Signed-off-by:
-
Josef Bacik authored
When we do btrfs_block_rsv_release, if global_block_rsv is not full we will release all the extra bytes to global_block_rsv, even if it's only a little short of the amount of space that we need to reserve. This causes us to starve ourselves of reservable space during the transaction which will force us to shrink delalloc bytes and commit the transaction more often than we should. So instead just add the amount of bytes we need to add to the global reserve so reserved == size, and then add the rest back into the space_info for general use. Thanks, Signed-off-by:
-
Josef Bacik authored
When running xfstests 224 I kept getting ENOSPC when trying to remove the files, and this is because we were returning ret from check_path_shared while it was uninitalized, which isn't right. Fix this to return 0 properly, and now xfstests 224 doesn't freak out when it tries to clean itself up. Thanks, Signed-off-by:
-
Tsutomu Itoh authored
btrfs_start_ioctl_transaction() returns ERR_PTR(), not NULL. So, it is necessary to use IS_ERR() to check the return value. Signed-off-by:
-
Tsutomu Itoh authored
The error check of btrfs_join_transaction()/btrfs_join_transaction_nolock() is added, and the mistake of the error check in several places is corrected. For more stable Btrfs, I think that we should reduce BUG_ON(). But, I think that long time is necessary for this. So, I propose this patch as a short-term solution. With this patch: - To more stable Btrfs, the part that should be corrected is clarified. - The panic isn't done by the NULL pointer reference etc. (even if BUG_ON() is increased temporarily) - The error code is returned in the place where the error can be easily returned. As a long-term plan: - BUG_ON() is reduced by using the forced-readonly framework, etc. Signed-off-by:
-
Julia Lawall authored
After the conditional that precedes the following code, inode may be an ERR_PTR value. This can eg result from a memory allocation failure via the call to btrfs_iget, and thus does not imply that root is different than sub_root. Thus, an IS_ERR check is added to ensure that there is no dereference of inode in this case. The semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @r@ identifier f; @@ f(...) { ... return ERR_PTR(...); } @@ identifier r.f, fld; expression x; statement S1,S2; @@ x = f(...) ... when != IS_ERR(x) ( if (IS_ERR(x) ||...) S1 else S2 | *x->fld ) // </smpl> Signed-off-by:
Julia Lawall <julia@diku.dk> Signed-off-by:
-
liubo authored
There is a missing break in switch, fix it. Signed-off-by:
Liu Bo <liubo2009@cn.fujitsu.com> Signed-off-by:
-
liubo authored
To make btrfs more stable, add several missing necessary memory allocation checks, and when no memory, return proper errno. We've checked that some of those -ENOMEM errors will be returned to userspace, and some will be catched by BUG_ON() in the upper callers, and none will be ignored silently. Signed-off-by:
-
liubo authored
btrfs_submit_compressed_read() is lack of memory allocation checks and corresponding error route. After this fix, if it comes to "no memory" case, errno will be returned to userland step by step, and tell users this operation cannot go on. Signed-off-by:
-
-
- 26 Jan, 2011 12 commits
-
-
Li Zefan authored
Suppose: - the source extent is: [0, 100] - the src offset is 10 - the clone length is 90 - the dest offset is 0 This statement: new_key.offset = key.offset + destoff - off will produce such an extent for the dest file: [ino, BTRFS_EXTENT_DATA_KEY, -10] , which is obviously wrong. Signed-off-by:Li Zefan <lizf@cn.fujitsu.com>
-
Miao Xie authored
fixup, which is allocated when starting page write to fix up the extent without ORDERED bit set, should be freed after this work is done. Signed-off-by:
Miao Xie <miaox@cn.fujitsu.com> Signed-off-by:
-
Miao Xie authored
Steps to reproduce: # mkfs.btrfs /dev/sda2 # mount /dev/sda2 /mnt # touch /mnt/file0 # setfacl -m 'u:root:x,g::x,o::x' /mnt/file0 # umount /mnt # mount /dev/sda2 -o noacl /mnt # getfacl /mnt/file0 ... user::rw- user:root:--x group::--x mask::--x other::--x The output should be: user::rw- group::--x other::--x Signed-off-by:
-
Tero Roponen authored
We must save and free the original kstrdup()'ed pointer because strsep() modifies its first argument. Signed-off-by:
Tero Roponen <tero.roponen@gmail.com> Signed-off-by:
-
Ian Kent authored
We missed a memory deallocation in commit 450ba0ea. If an existing super block is found at mount and there is no error condition then the pre-allocated tree_root and fs_info are no not used and are not freeded. Signed-off-by:
Ian Kent <raven@themaw.net> Signed-off-by:
-
Li Zefan authored
fs_info, which is allocated in open_ctree(), should be freed in close_ctree(). Signed-off-by: -
Li Zefan authored
After returing extents from a cluster to the block group, some extents in the block group may be mergeable. Reviewed-by:
-
Li Zefan authored
When adding a new extent, we'll firstly see if we can merge this extent to the left or/and right extent. Extract this as a helper try_merge_free_space(). As a side effect, we fix a small bug that if the new extent has non-bitmap left entry but is unmergeble, we'll directly link the extent without trying to drop it into bitmap. This also prepares for the next patch. Reviewed-by:
-
Li Zefan authored
When allocating extent entry from a cluster, we should update the free_space and free_extents fields of the block group. Reviewed-by:
-
Li Zefan authored
If there's no more free space in a bitmap, we should free it. Reviewed-by:
-
Li Zefan authored
Remove some duplicated code. This prepares for the next patch. Reviewed-by:
-
Li Zefan authored
If a block group is smaller than 1GB, the extent entry threadhold calculation will always set the threshold to 0. So as free space gets fragmented, btrfs will switch to use bitmap to manage free space, but then will never switch back to extents due to this bug. Reviewed-by:
-
- 17 Jan, 2011 1 commit
-
-
liubo authored
This patch comes from "Forced readonly mounts on errors" ideas. As we know, this is the first step in being more fault tolerant of disk corruptions instead of just using BUG() statements. The major content: - add a framework for generating errors that should result in filesystems going readonly. - keep FS state in disk super block. - make sure that all of resource will be freed and released at umount time. - make sure that fter FS is forced readonly on error, there will be no more disk change before FS is corrected. For this, we should stop write operation. After this patch is applied, the conversion from BUG() to such a framework can happen incrementally. Signed-off-by:
-
- 16 Jan, 2011 1 commit
-
-
Ben Hutchings authored
Filesystem rebalancing (BTRFS_IOC_BALANCE) affects the entire filesystem and may run uninterruptibly for a long time. This does not seem to be something that an unprivileged user should be able to do. Reported-by:
Aron Xu <happyaron.xu@gmail.com> Signed-off-by:
Ben Hutchings <ben@decadent.org.uk> Signed-off-by:
-
