- 10 12月, 2016 2 次提交
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由 Dan Carpenter 提交于
We should set the error code if kzalloc() fails. Fixes: 67cf5b09 ("ext4: add the basic function for inline data support") Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Cc: stable@vger.kernel.org
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由 Darrick J. Wong 提交于
Don't load an inode with a negative size; this causes integer overflow problems in the VFS. [ Added EXT4_ERROR_INODE() to mark file system as corrupted. -TYT] Fixes: a48380f7 (ext4: rename i_dir_acl to i_size_high) Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org
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- 04 12月, 2016 2 次提交
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由 Dan Carpenter 提交于
Before commit c3fe493c ('ext4: remove unneeded test in ext4_alloc_file_blocks()') then it was possible for "depth" to be -1 but now, it's not possible that it is negative. Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Reviewed-by: NJan Kara <jack@suse.cz>
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由 Jan Kara 提交于
Combination of data=ordered mode and journal_async_commit mount option is invalid. However the check in parse_options() fails to detect the case where we simply end up defaulting to data=ordered mode and we detect the problem only on remount which triggers hard to understand failure to remount the filesystem. Fix the checking of mount options to take into account also the default mode by moving the check somewhat later in the mount sequence. Reported-by: NWolfgang Walter <linux@stwm.de> Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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- 03 12月, 2016 1 次提交
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由 Theodore Ts'o 提交于
On a filesystem with no journal, a symlink longer than about 32 characters (exact length depending on padding for encryption) could not be followed or read immediately after being created in an encrypted directory. This happened because when the symlink data went through the delayed allocation path instead of the journaling path, the symlink was incorrectly detected as a "fast" symlink rather than a "slow" symlink until its data was written out. To fix this, disable delayed allocation for symlinks, since there is no benefit for delayed allocation anyway. Reported-by: NEric Biggers <ebiggers@google.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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- 02 12月, 2016 8 次提交
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由 Eryu Guan 提交于
Ralf Spenneberg reported that he hit a kernel crash when mounting a modified ext4 image. And it turns out that kernel crashed when calculating fs overhead (ext4_calculate_overhead()), this is because the image has very large s_first_meta_bg (debug code shows it's 842150400), and ext4 overruns the memory in count_overhead() when setting bitmap buffer, which is PAGE_SIZE. ext4_calculate_overhead(): buf = get_zeroed_page(GFP_NOFS); <=== PAGE_SIZE buffer blks = count_overhead(sb, i, buf); count_overhead(): for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) { <=== j = 842150400 ext4_set_bit(EXT4_B2C(sbi, s++), buf); <=== buffer overrun count++; } This can be reproduced easily for me by this script: #!/bin/bash rm -f fs.img mkdir -p /mnt/ext4 fallocate -l 16M fs.img mke2fs -t ext4 -O bigalloc,meta_bg,^resize_inode -F fs.img debugfs -w -R "ssv first_meta_bg 842150400" fs.img mount -o loop fs.img /mnt/ext4 Fix it by validating s_first_meta_bg first at mount time, and refusing to mount if its value exceeds the largest possible meta_bg number. Reported-by: NRalf Spenneberg <ralf@os-t.de> Signed-off-by: NEryu Guan <guaneryu@gmail.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Reviewed-by: NAndreas Dilger <adilger@dilger.ca>
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由 Eric Biggers 提交于
It was possible for an xattr value to have a very large size, which would then pass validation on 32-bit architectures due to a pointer wraparound. Fix this by validating the size in a way which avoids pointer wraparound. It was also possible that a value's size would fit in the available space but its padded size would not. This would cause an out-of-bounds memory write in ext4_xattr_set_entry when replacing the xattr value. For example, if an xattr value of unpadded size 253 bytes went until the very end of the inode or block, then using setxattr(2) to replace this xattr's value with 256 bytes would cause a write to the 3 bytes past the end of the inode or buffer, and the new xattr value would be incorrectly truncated. Fix this by requiring that the padded size fit in the available space rather than the unpadded size. This patch shouldn't have any noticeable effect on non-corrupted/non-malicious filesystems. Signed-off-by: NEric Biggers <ebiggers@google.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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由 Eric Biggers 提交于
With i_extra_isize equal to or close to the available space, it was possible for us to read past the end of the inode when trying to detect or validate in-inode xattrs. Fix this by checking for the needed extra space first. This patch shouldn't have any noticeable effect on non-corrupted/non-malicious filesystems. Signed-off-by: NEric Biggers <ebiggers@google.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Reviewed-by: NAndreas Dilger <adilger@dilger.ca>
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由 Eric Biggers 提交于
i_extra_isize not divisible by 4 is problematic for several reasons: - It causes the in-inode xattr space to be misaligned, but the xattr header and entries are not declared __packed to express this possibility. This may cause poor performance or incorrect code generation on some platforms. - When validating the xattr entries we can read past the end of the inode if the size available for xattrs is not a multiple of 4. - It allows the nonsensical i_extra_isize=1, which doesn't even leave enough room for i_extra_isize itself. Therefore, update ext4_iget() to consider i_extra_isize not divisible by 4 to be an error, like the case where i_extra_isize is too large. This also matches the rule recently added to e2fsck for determining whether an inode has valid i_extra_isize. This patch shouldn't have any noticeable effect on non-corrupted/non-malicious filesystems, since the size of ext4_inode has always been a multiple of 4. Signed-off-by: NEric Biggers <ebiggers@google.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Reviewed-by: NAndreas Dilger <adilger@dilger.ca>
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由 Eric Biggers 提交于
On a CONFIG_EXT4_FS_ENCRYPTION=n kernel, the ioctls to get and set encryption policies were disabled but EXT4_IOC_GET_ENCRYPTION_PWSALT was not. But there's no good reason to expose the pwsalt ioctl if the kernel doesn't support encryption. The pwsalt ioctl was also disabled pre-4.8 (via ext4_sb_has_crypto() previously returning 0 when encryption was disabled by config) and seems to have been enabled by mistake when ext4 encryption was refactored to use fs/crypto/. So let's disable it again. Signed-off-by: NEric Biggers <ebiggers@google.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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由 Eric Biggers 提交于
ext4_sb_has_crypto() just called through to ext4_has_feature_encrypt(), and all callers except one were already using the latter. So remove it and switch its one caller to ext4_has_feature_encrypt(). Signed-off-by: NEric Biggers <ebiggers@google.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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由 Daeho Jeong 提交于
We've fixed the race condition problem in calculating ext4 checksum value in commit b47820ed ("ext4: avoid modifying checksum fields directly during checksum veficationon"). However, by this change, when calculating the checksum value of inode whose i_extra_size is less than 4, we couldn't calculate the checksum value in a proper way. This problem was found and reported by Nix, Thank you. Reported-by: NNix <nix@esperi.org.uk> Signed-off-by: NDaeho Jeong <daeho.jeong@samsung.com> Signed-off-by: NYoungjin Gil <youngjin.gil@samsung.com> Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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由 Jan Kara 提交于
Warn when a page is dirtied without buffers (as that will likely lead to a crash in ext4_writepages()) or when it gets newly dirtied without the page being locked (as there is nothing that prevents buffers to get stripped just before calling set_page_dirty() under memory pressure). Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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- 30 11月, 2016 2 次提交
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由 Jan Kara 提交于
Currently we just silently ignore flags that we don't understand (or that cannot be manipulated) through EXT4_IOC_SETFLAGS and EXT4_IOC_FSSETXATTR ioctls. This makes it problematic for the unused flags to be used in future (some app may be inadvertedly setting them and we won't notice until the flag gets used). Also this is inconsistent with other filesystems like XFS or BTRFS which return EOPNOTSUPP when they see a flag they cannot set. ext4 has the additional problem that there are flags which are returned by EXT4_IOC_GETFLAGS ioctl but which cannot be modified via EXT4_IOC_SETFLAGS. So we have to be careful to ignore value of these flags and not fail the ioctl when they are set (as e.g. chattr(1) passes flags returned from EXT4_IOC_GETFLAGS to EXT4_IOC_SETFLAGS without any masking and thus we'd break this utility). Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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由 Jan Kara 提交于
Add EXT4_JOURNAL_DATA_FL and EXT4_EXTENTS_FL to EXT4_FL_USER_MODIFIABLE to recognize that they are modifiable by userspace. So far we got away without having them there because ext4_ioctl_setflags() treats them in a special way. But it was really confusing like that. Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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- 27 11月, 2016 1 次提交
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由 Eric Sandeen 提交于
In ext4_put_super, we call brelse on the buffer head containing the ext4 superblock, but then try to use it when we stop the mmp thread, because when the thread shuts down it does: write_mmp_block ext4_mmp_csum_set ext4_has_metadata_csum WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb)...) which reaches into sb->s_fs_info->s_es->s_feature_ro_compat, which lives in the superblock buffer s_sbh which we just released. Fix this by moving the brelse down to a point where we are no longer using it. Reported-by: NWang Shu <shuwang@redhat.com> Signed-off-by: NEric Sandeen <sandeen@redhat.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Reviewed-by: NAndreas Dilger <adilger@dilger.ca>
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- 23 11月, 2016 1 次提交
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由 Jan Kara 提交于
When ext4 is compiled with DAX support, it now needs the iomap code. Add appropriate select to Kconfig. Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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- 22 11月, 2016 2 次提交
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由 Eric Biggers 提交于
On a lockdep-enabled kernel, xfstests generic/027 fails due to a lockdep warning when run on ext4 mounted with -o test_dummy_encryption: xfs_io/4594 is trying to acquire lock: (jbd2_handle ){++++.+}, at: [<ffffffff813096ef>] jbd2_log_wait_commit+0x5/0x11b but task is already holding lock: (jbd2_handle ){++++.+}, at: [<ffffffff813000de>] start_this_handle+0x354/0x3d8 The abbreviated call stack is: [<ffffffff813096ef>] ? jbd2_log_wait_commit+0x5/0x11b [<ffffffff8130972a>] jbd2_log_wait_commit+0x40/0x11b [<ffffffff813096ef>] ? jbd2_log_wait_commit+0x5/0x11b [<ffffffff8130987b>] ? __jbd2_journal_force_commit+0x76/0xa6 [<ffffffff81309896>] __jbd2_journal_force_commit+0x91/0xa6 [<ffffffff813098b9>] jbd2_journal_force_commit_nested+0xe/0x18 [<ffffffff812a6049>] ext4_should_retry_alloc+0x72/0x79 [<ffffffff812f0c1f>] ext4_xattr_set+0xef/0x11f [<ffffffff812cc35b>] ext4_set_context+0x3a/0x16b [<ffffffff81258123>] fscrypt_inherit_context+0xe3/0x103 [<ffffffff812ab611>] __ext4_new_inode+0x12dc/0x153a [<ffffffff812bd371>] ext4_create+0xb7/0x161 When a file is created in an encrypted directory, ext4_set_context() is called to set an encryption context on the new file. This calls ext4_xattr_set(), which contains a retry loop where the journal is forced to commit if an ENOSPC error is encountered. If the task actually were to wait for the journal to commit in this case, then it would deadlock because a handle remains open from __ext4_new_inode(), so the running transaction can't be committed yet. Fortunately, __jbd2_journal_force_commit() avoids the deadlock by not allowing the running transaction to be committed while the current task has it open. However, the above lockdep warning is still triggered. This was a false positive which was introduced by: 1eaa566d: jbd2: track more dependencies on transaction commit Fix the problem by passing the handle through the 'fs_data' argument to ext4_set_context(), then using ext4_xattr_set_handle() instead of ext4_xattr_set(). And in the case where no journal handle is specified and ext4_set_context() has to open one, add an ENOSPC retry loop since in that case it is the outermost transaction. Signed-off-by: NEric Biggers <ebiggers@google.com>
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由 Ross Zwisler 提交于
The last user of ext4_aligned_io() was the DAX path in ext4_direct_IO_write(). This usage was removed by Jan Kara's patch entitled "ext4: Rip out DAX handling from direct IO path". Signed-off-by: NRoss Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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- 21 11月, 2016 8 次提交
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由 Jan Kara 提交于
Reads and writes for DAX inodes should no longer end up in direct IO code. Rip out the support and add a warning. Reviewed-by: NRoss Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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由 Jan Kara 提交于
Convert DAX faults to use iomap infrastructure. We would not have to start transaction in ext4_dax_fault() anymore since ext4_iomap_begin takes care of that but so far we do that to avoid lock inversion of transaction start with DAX entry lock which gets acquired in dax_iomap_fault() before calling ->iomap_begin handler. Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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由 Jan Kara 提交于
Currently mapping of blocks for DAX writes happen with EXT4_GET_BLOCKS_PRE_IO flag set. That has a result that each ext4_map_blocks() call creates a separate written extent, although it could be merged to the neighboring extents in the extent tree. The reason for using this flag is that in case the extent is unwritten, we need to convert it to written one and zero it out. However this "convert mapped range to written" operation is already implemented by ext4_map_blocks() for the case of data writes into unwritten extent. So just use flags for that mode of operation, simplify the code, and avoid unnecessary split extents. Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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由 Jan Kara 提交于
Implement DAX writes using the new iomap infrastructure instead of overloading the direct IO path. Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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由 Jan Kara 提交于
Use iomap infrastructure for zeroing blocks when in DAX mode. ext4_iomap_begin() handles read requests just fine and that's all that is needed for iomap_zero_range(). Reviewed-by: NRoss Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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由 Jan Kara 提交于
Implement basic iomap_begin function that handles reading and use it for DAX reads. Reviewed-by: NRoss Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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由 Jan Kara 提交于
Currently we have S_DAX set inode->i_flags for a regular file whenever ext4 is mounted with dax mount option. However in some cases we cannot really do DAX - e.g. when inode is marked to use data journalling, when inode data is being encrypted, or when inode is stored inline. Make sure S_DAX flag is appropriately set/cleared in these cases. Reviewed-by: NRoss Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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由 Jan Kara 提交于
Factor out checks of 'from' and whether we are overwriting out of ext4_file_write_iter() so that the function is easier to follow. Reviewed-by: NRoss Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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- 19 11月, 2016 4 次提交
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由 Theodore Ts'o 提交于
The commit "ext4: sanity check the block and cluster size at mount time" should prevent any problems, but in case the superblock is modified while the file system is mounted, add an extra safety check to make sure we won't overrun the allocated buffer. Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Cc: stable@vger.kernel.org
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由 Theodore Ts'o 提交于
Centralize the checks for inodes_per_block and be more strict to make sure the inodes_per_block_group can't end up being zero. Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Reviewed-by: NAndreas Dilger <adilger@dilger.ca> Cc: stable@vger.kernel.org
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由 Theodore Ts'o 提交于
Fix a large number of problems with how we handle mount options in the superblock. For one, if the string in the superblock is long enough that it is not null terminated, we could run off the end of the string and try to interpret superblocks fields as characters. It's unlikely this will cause a security problem, but it could result in an invalid parse. Also, parse_options is destructive to the string, so in some cases if there is a comma-separated string, it would be modified in the superblock. (Fortunately it only happens on file systems with a 1k block size.) Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Cc: stable@vger.kernel.org
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由 Theodore Ts'o 提交于
If the block size or cluster size is insane, reject the mount. This is important for security reasons (although we shouldn't be just depending on this check). Ref: http://www.securityfocus.com/archive/1/539661 Ref: https://bugzilla.redhat.com/show_bug.cgi?id=1332506Reported-by: NBorislav Petkov <bp@alien8.de> Reported-by: NNikolay Borisov <kernel@kyup.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Cc: stable@vger.kernel.org
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- 15 11月, 2016 5 次提交
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由 Eric Whitney 提交于
The parameter "handle" isn't used. Signed-off-by: NEric Whitney <enwlinux@gmail.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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由 Eric Whitney 提交于
Runs of xfstest ext4/022 on nojournal file systems result in failures because the inodes of some of its test files do not expand as expected. The cause is a conditional in ext4_mark_inode_dirty() that prevents inode expansion unless the test file system has a journal. Remove this unnecessary restriction. Signed-off-by: NEric Whitney <enwlinux@gmail.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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由 Deepa Dinamani 提交于
CURRENT_TIME_SEC and CURRENT_TIME are not y2038 safe. current_time() will be transitioned to be y2038 safe along with vfs. current_time() returns timestamps according to the granularities set in the super_block. The granularity check in ext4_current_time() to call current_time() or CURRENT_TIME_SEC is not required. Use current_time() directly to obtain timestamps unconditionally, and remove ext4_current_time(). Quota files are assumed to be on the same filesystem. Hence, use current_time() for these files as well. Signed-off-by: NDeepa Dinamani <deepa.kernel@gmail.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Reviewed-by: NArnd Bergmann <arnd@arndb.de>
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由 Chandan Rajendra 提交于
The number of 'counters' elements needed in 'struct sg' is super_block->s_blocksize_bits + 2. Presently we have 16 'counters' elements in the array. This is insufficient for block sizes >= 32k. In such cases the memcpy operation performed in ext4_mb_seq_groups_show() would cause stack memory corruption. Fixes: c9de560dSigned-off-by: NChandan Rajendra <chandan@linux.vnet.ibm.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Reviewed-by: NJan Kara <jack@suse.cz> Cc: stable@vger.kernel.org
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由 Chandan Rajendra 提交于
'border' variable is set to a value of 2 times the block size of the underlying filesystem. With 64k block size, the resulting value won't fit into a 16-bit variable. Hence this commit changes the data type of 'border' to 'unsigned int'. Fixes: c9de560dSigned-off-by: NChandan Rajendra <chandan@linux.vnet.ibm.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Reviewed-by: NAndreas Dilger <adilger@dilger.ca> Cc: stable@vger.kernel.org
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- 14 11月, 2016 4 次提交
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由 Theodore Ts'o 提交于
If there is an error reported in mballoc via ext4_grp_locked_error(), the code is holding a spinlock, so ext4_commit_super() must not try to lock the buffer head, or else it will trigger a BUG: BUG: sleeping function called from invalid context at ./include/linux/buffer_head.h:358 in_atomic(): 1, irqs_disabled(): 0, pid: 993, name: mount CPU: 0 PID: 993 Comm: mount Not tainted 4.9.0-rc1-clouder1 #62 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.1-0-g4adadbd-20150316_085822-nilsson.home.kraxel.org 04/01/2014 ffff880006423548 ffffffff81318c89 ffffffff819ecdd0 0000000000000166 ffff880006423558 ffffffff810810b0 ffff880006423580 ffffffff81081153 ffff880006e5a1a0 ffff88000690e400 0000000000000000 ffff8800064235c0 Call Trace: [<ffffffff81318c89>] dump_stack+0x67/0x9e [<ffffffff810810b0>] ___might_sleep+0xf0/0x140 [<ffffffff81081153>] __might_sleep+0x53/0xb0 [<ffffffff8126c1dc>] ext4_commit_super+0x19c/0x290 [<ffffffff8126e61a>] __ext4_grp_locked_error+0x14a/0x230 [<ffffffff81081153>] ? __might_sleep+0x53/0xb0 [<ffffffff812822be>] ext4_mb_generate_buddy+0x1de/0x320 Since ext4_grp_locked_error() calls ext4_commit_super with sync == 0 (and it is the only caller which does so), avoid locking and unlocking the buffer in this case. This can result in races with ext4_commit_super() if there are other problems (which is what commit 4743f839 was trying to address), but a Warning is better than BUG. Fixes: 4743f839 Cc: stable@vger.kernel.org # 4.9 Reported-by: NNikolay Borisov <kernel@kyup.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Reviewed-by: NJan Kara <jack@suse.cz>
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由 Theodore Ts'o 提交于
Return errors to the caller instead of declaring the file system corrupted. Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Reviewed-by: NJan Kara <jack@suse.cz>
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由 Theodore Ts'o 提交于
This allows us to properly propagate errors back up to ext4_truncate()'s callers. This also means we no longer have to silently ignore some errors (e.g., when trying to add the inode to the orphan inode list). Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Reviewed-by: NJan Kara <jack@suse.cz>
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由 David Gstir 提交于
Avoid re-use of page index as tweak for AES-XTS when multiple parts of same page are encrypted. This will happen on multiple (partial) calls of fscrypt_encrypt_page on same page. page->index is only valid for writeback pages. Signed-off-by: NDavid Gstir <david@sigma-star.at> Signed-off-by: NRichard Weinberger <richard@nod.at> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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