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* kernfs: fix regression in kernfs_fop_write caused by wrong typeIvan Vecera2018-02-161-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | commit ba87977a49913129962af8ac35b0e13e0fa4382d upstream. Commit b7ce40cff0b9 ("kernfs: cache atomic_write_len in kernfs_open_file") changes type of local variable 'len' from ssize_t to size_t. This change caused that the *ppos value is updated also when the previous write callback failed. Mentioned snippet: ... len = ops->write(...); <- return value can be negative ... if (len > 0) <- true here in this case *ppos += len; ... Fixes: b7ce40cff0b9 ("kernfs: cache atomic_write_len in kernfs_open_file") Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Ivan Vecera <ivecera@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* NFS: commit direct writes even if they fail partiallyJ. Bruce Fields2018-02-161-3/+1
| | | | | | | | | | | | | | | | | | commit 1b8d97b0a837beaf48a8449955b52c650a7114b4 upstream. If some of the WRITE calls making up an O_DIRECT write syscall fail, we neglect to commit, even if some of the WRITEs succeed. We also depend on the commit code to free the reference count on the nfs_page taken in the "if (request_commit)" case at the end of nfs_direct_write_completion(). The problem was originally noticed because ENOSPC's encountered partway through a write would result in a closed file being sillyrenamed when it should have been unlinked. Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* NFS: Add a cond_resched() to nfs_commit_release_pages()Trond Myklebust2018-02-161-0/+2
| | | | | | | | | | | | | commit 7f1bda447c9bd48b415acedba6b830f61591601f upstream. The commit list can get very large, and so we need a cond_resched() in nfs_commit_release_pages() in order to ensure we don't hog the CPU for excessive periods of time. Reported-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* CIFS: zero sensitive data when freeingAurelien Aptel2018-02-163-15/+8
| | | | | | | | | | | | commit 97f4b7276b829a8927ac903a119bef2f963ccc58 upstream. also replaces memset()+kfree() by kzfree(). Signed-off-by: Aurelien Aptel <aaptel@suse.com> Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* cifs: Fix autonegotiate security settings mismatchDaniel N Pettersson2018-02-161-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | commit 9aca7e454415f7878b28524e76bebe1170911a88 upstream. Autonegotiation gives a security settings mismatch error if the SMB server selects an SMBv3 dialect that isn't SMB3.02. The exact error is "protocol revalidation - security settings mismatch". This can be tested using Samba v4.2 or by setting the global Samba setting max protocol = SMB3_00. The check that fails in smb3_validate_negotiate is the dialect verification of the negotiate info response. This is because it tries to verify against the protocol_id in the global smbdefault_values. The protocol_id in smbdefault_values is SMB3.02. In SMB2_negotiate the protocol_id in smbdefault_values isn't updated, it is global so it probably shouldn't be, but server->dialect is. This patch changes the check in smb3_validate_negotiate to use server->dialect instead of server->vals->protocol_id. The patch works with autonegotiate and when using a specific version in the vers mount option. Signed-off-by: Daniel N Pettersson <danielnp@axis.com> Signed-off-by: Steve French <smfrench@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* cifs: Fix missing put_xid in cifs_file_strict_mmapMatthew Wilcox2018-02-161-14/+12
| | | | | | | | | | | | | | commit f04a703c3d613845ae3141bfaf223489de8ab3eb upstream. If cifs_zap_mapping() returned an error, we would return without putting the xid that we got earlier. Restructure cifs_file_strict_mmap() and cifs_file_mmap() to be more similar to each other and have a single point of return that always puts the xid. Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* quota: Check for register_shrinker() failure.Tetsuo Handa2018-02-071-1/+2
| | | | | | | | | | | | | | | | | [ Upstream commit 88bc0ede8d35edc969350852894dc864a2dc1859 ] register_shrinker() might return -ENOMEM error since Linux 3.12. Call panic() as with other failure checks in this function if register_shrinker() failed. Fixes: 1d3d4437eae1 ("vmscan: per-node deferred work") Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Cc: Jan Kara <jack@suse.com> Cc: Michal Hocko <mhocko@suse.com> Reviewed-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* nfsd: check for use of the closed special stateidAndrew Elble2018-02-071-2/+5
| | | | | | | | | | | [ Upstream commit ae254dac721d44c0bfebe2795df87459e2e88219 ] Prevent the use of the closed (invalid) special stateid by clients. Signed-off-by: Andrew Elble <aweits@rit.edu> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* nfsd: CLOSE SHOULD return the invalid special stateid for NFSv4.x (x>0)Trond Myklebust2018-02-071-0/+8
| | | | | | | | | [ Upstream commit fb500a7cfee7f2f447d2bbf30cb59629feab6ac1 ] Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* fs/fcntl: f_setown, avoid undefined behaviourJiri Slaby2018-01-311-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | commit fc3dc67471461c0efcb1ed22fb7595121d65fad9 upstream. fcntl(0, F_SETOWN, 0x80000000) triggers: UBSAN: Undefined behaviour in fs/fcntl.c:118:7 negation of -2147483648 cannot be represented in type 'int': CPU: 1 PID: 18261 Comm: syz-executor Not tainted 4.8.1-0-syzkaller #1 ... Call Trace: ... [<ffffffffad8f0868>] ? f_setown+0x1d8/0x200 [<ffffffffad8f19a9>] ? SyS_fcntl+0x999/0xf30 [<ffffffffaed1fb00>] ? entry_SYSCALL_64_fastpath+0x23/0xc1 Fix that by checking the arg parameter properly (against INT_MAX) before "who = -who". And return immediatelly with -EINVAL in case it is wrong. Note that according to POSIX we can return EINVAL: http://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html [EINVAL] The cmd argument is F_SETOWN and the value of the argument is not valid as a process or process group identifier. [v2] returns an error, v1 used to fail silently [v3] implement proper check for the bad value INT_MIN Signed-off-by: Jiri Slaby <jslaby@suse.cz> Cc: Jeff Layton <jlayton@poochiereds.net> Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* reiserfs: don't preallocate blocks for extended attributesJeff Mahoney2018-01-311-1/+1
| | | | | | | | | | | | | | | commit 54930dfeb46e978b447af0fb8ab4e181c1bf9d7a upstream. Most extended attributes will fit in a single block. More importantly, we drop the reference to the inode while holding the transaction open so the preallocated blocks aren't released. As a result, the inode may be evicted before it's removed from the transaction's prealloc list which can cause memory corruption. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* reiserfs: fix race in prealloc discardJeff Mahoney2018-01-311-2/+10
| | | | | | | | | | | | | | | | | | commit 08db141b5313ac2f64b844fb5725b8d81744b417 upstream. The main loop in __discard_prealloc is protected by the reiserfs write lock which is dropped across schedules like the BKL it replaced. The problem is that it checks the value, calls a routine that schedules, and then adjusts the state. As a result, two threads that are calling reiserfs_prealloc_discard at the same time can race when one calls reiserfs_free_prealloc_block, the lock is dropped, and the other calls reiserfs_free_prealloc_block with the same block number. In the right circumstances, it can cause the prealloc count to go negative. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* pipe: avoid round_pipe_size() nr_pages overflow on 32-bitJoe Lawrence2018-01-311-2/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | commit d3f14c485867cfb2e0c48aa88c41d0ef4bf5209c upstream. round_pipe_size() contains a right-bit-shift expression which may overflow, which would cause undefined results in a subsequent roundup_pow_of_two() call. static inline unsigned int round_pipe_size(unsigned int size) { unsigned long nr_pages; nr_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; return roundup_pow_of_two(nr_pages) << PAGE_SHIFT; } PAGE_SIZE is defined as (1UL << PAGE_SHIFT), so: - 4 bytes wide on 32-bit (0 to 0xffffffff) - 8 bytes wide on 64-bit (0 to 0xffffffffffffffff) That means that 32-bit round_pipe_size(), nr_pages may overflow to 0: size=0x00000000 nr_pages=0x0 size=0x00000001 nr_pages=0x1 size=0xfffff000 nr_pages=0xfffff size=0xfffff001 nr_pages=0x0 << ! size=0xffffffff nr_pages=0x0 << ! This is bad because roundup_pow_of_two(n) is undefined when n == 0! 64-bit is not a problem as the unsigned int size is 4 bytes wide (similar to 32-bit) and the larger, 8 byte wide unsigned long, is sufficient to handle the largest value of the bit shift expression: size=0xffffffff nr_pages=100000 Modify round_pipe_size() to return 0 if n == 0 and updates its callers to handle accordingly. Link: http://lkml.kernel.org/r/1507658689-11669-3-git-send-email-joe.lawrence@redhat.com Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com> Reported-by: Mikulas Patocka <mpatocka@redhat.com> Reviewed-by: Mikulas Patocka <mpatocka@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Jens Axboe <axboe@kernel.dk> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Dong Jinguang <dongjinguang@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* udf: Avoid overflow when session starts at large offsetJan Kara2017-12-201-1/+1
| | | | | | | | | | | | | [ Upstream commit abdc0eb06964fe1d2fea6dd1391b734d0590365d ] When session starts beyond offset 2^31 the arithmetics in udf_check_vsd() would overflow. Make sure the computation is done in large enough type. Reported-by: Cezary Sliwa <sliwa@ifpan.edu.pl> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* tty fix oops when rmmod 8250nixiaoming2017-12-201-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | [ Upstream commit c79dde629d2027ca80329c62854a7635e623d527 ] After rmmod 8250.ko tty_kref_put starts kwork (release_one_tty) to release proc interface oops when accessing driver->driver_name in proc_tty_unregister_driver Use jprobe, found driver->driver_name point to 8250.ko static static struct uart_driver serial8250_reg .driver_name= serial, Use name in proc_dir_entry instead of driver->driver_name to fix oops test on linux 4.1.12: BUG: unable to handle kernel paging request at ffffffffa01979de IP: [<ffffffff81310f40>] strchr+0x0/0x30 PGD 1a0d067 PUD 1a0e063 PMD 851c1f067 PTE 0 Oops: 0000 [#1] PREEMPT SMP Modules linked in: ... ... [last unloaded: 8250] CPU: 7 PID: 116 Comm: kworker/7:1 Tainted: G O 4.1.12 #1 Hardware name: Insyde RiverForest/Type2 - Board Product Name1, BIOS NE5KV904 12/21/2015 Workqueue: events release_one_tty task: ffff88085b684960 ti: ffff880852884000 task.ti: ffff880852884000 RIP: 0010:[<ffffffff81310f40>] [<ffffffff81310f40>] strchr+0x0/0x30 RSP: 0018:ffff880852887c90 EFLAGS: 00010282 RAX: ffffffff81a5eca0 RBX: ffffffffa01979de RCX: 0000000000000004 RDX: ffff880852887d10 RSI: 000000000000002f RDI: ffffffffa01979de RBP: ffff880852887cd8 R08: 0000000000000000 R09: ffff88085f5d94d0 R10: 0000000000000195 R11: 0000000000000000 R12: ffffffffa01979de R13: ffff880852887d00 R14: ffffffffa01979de R15: ffff88085f02e840 FS: 0000000000000000(0000) GS:ffff88085f5c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffa01979de CR3: 0000000001a0c000 CR4: 00000000001406e0 Stack: ffffffff812349b1 ffff880852887cb8 ffff880852887d10 ffff88085f5cd6c2 ffff880852800a80 ffffffffa01979de ffff880852800a84 0000000000000010 ffff88085bb28bd8 ffff880852887d38 ffffffff812354f0 ffff880852887d08 Call Trace: [<ffffffff812349b1>] ? __xlate_proc_name+0x71/0xd0 [<ffffffff812354f0>] remove_proc_entry+0x40/0x180 [<ffffffff815f6811>] ? _raw_spin_lock_irqsave+0x41/0x60 [<ffffffff813be520>] ? destruct_tty_driver+0x60/0xe0 [<ffffffff81237c68>] proc_tty_unregister_driver+0x28/0x40 [<ffffffff813be548>] destruct_tty_driver+0x88/0xe0 [<ffffffff813be5bd>] tty_driver_kref_put+0x1d/0x20 [<ffffffff813becca>] release_one_tty+0x5a/0xd0 [<ffffffff81074159>] process_one_work+0x139/0x420 [<ffffffff810745a1>] worker_thread+0x121/0x450 [<ffffffff81074480>] ? process_scheduled_works+0x40/0x40 [<ffffffff8107a16c>] kthread+0xec/0x110 [<ffffffff81080000>] ? tg_rt_schedulable+0x210/0x220 [<ffffffff8107a080>] ? kthread_freezable_should_stop+0x80/0x80 [<ffffffff815f7292>] ret_from_fork+0x42/0x70 [<ffffffff8107a080>] ? kthread_freezable_should_stop+0x80/0x80 Signed-off-by: nixiaoming <nixiaoming@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* xfs: fix log block underflow during recovery cycle verificationBrian Foster2017-12-201-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | [ Upstream commit 9f2a4505800607e537e9dd9dea4f55c4b0c30c7a ] It is possible for mkfs to format very small filesystems with too small of an internal log with respect to the various minimum size and block count requirements. If this occurs when the log happens to be smaller than the scan window used for cycle verification and the scan wraps the end of the log, the start_blk calculation in xlog_find_head() underflows and leads to an attempt to scan an invalid range of log blocks. This results in log recovery failure and a failed mount. Since there may be filesystems out in the wild with this kind of geometry, we cannot simply refuse to mount. Instead, cap the scan window for cycle verification to the size of the physical log. This ensures that the cycle verification proceeds as expected when the scan wraps the end of the log. Reported-by: Zorro Lang <zlang@redhat.com> Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* GFS2: Take inode off order_write list when setting jdata flagBob Peterson2017-12-201-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | [ Upstream commit cc555b09d8c3817aeebda43a14ab67049a5653f7 ] This patch fixes a deadlock caused when the jdata flag is set for inodes that are already on the ordered write list. Since it is on the ordered write list, log_flush calls gfs2_ordered_write which calls filemap_fdatawrite. But since the inode had the jdata flag set, that calls gfs2_jdata_writepages, which tries to start a new transaction. A new transaction cannot be started because it tries to acquire the log_flush rwsem which is already locked by the log flush operation. The bottom line is: We cannot switch an inode from ordered to jdata until we eliminate any ordered data pages (via log flush) or any log_flush operation afterward will create the circular dependency above. So we need to flush the log before setting the diskflags to switch the file mode, then we need to remove the inode from the ordered writes list. Before this patch, the log flush was done for jdata->ordered, but that's wrong. If we're going from jdata to ordered, we don't need to call gfs2_log_flush because the call to filemap_fdatawrite will do it for us: filemap_fdatawrite() -> __filemap_fdatawrite_range() __filemap_fdatawrite_range() -> do_writepages() do_writepages() -> gfs2_jdata_writepages() gfs2_jdata_writepages() -> gfs2_log_flush() This patch modifies function do_gfs2_set_flags so that if a file has its jdata flag set, and it's already on the ordered write list, the log will be flushed and it will be removed from the list before setting the flag. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Acked-by: Abhijith Das <adas@redhat.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* btrfs: add missing memset while reading compressed inline extentsZygo Blaxell2017-12-201-0/+14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | [ Upstream commit e1699d2d7bf6e6cce3e1baff19f9dd4595a58664 ] This is a story about 4 distinct (and very old) btrfs bugs. Commit c8b978188c ("Btrfs: Add zlib compression support") added three data corruption bugs for inline extents (bugs #1-3). Commit 93c82d5750 ("Btrfs: zero page past end of inline file items") fixed bug #1: uncompressed inline extents followed by a hole and more extents could get non-zero data in the hole as they were read. The fix was to add a memset in btrfs_get_extent to zero out the hole. Commit 166ae5a418 ("btrfs: fix inline compressed read err corruption") fixed bug #2: compressed inline extents which contained non-zero bytes might be replaced with zero bytes in some cases. This patch removed an unhelpful memset from uncompress_inline, but the case where memset is required was missed. There is also a memset in the decompression code, but this only covers decompressed data that is shorter than the ram_bytes from the extent ref record. This memset doesn't cover the region between the end of the decompressed data and the end of the page. It has also moved around a few times over the years, so there's no single patch to refer to. This patch fixes bug #3: compressed inline extents followed by a hole and more extents could get non-zero data in the hole as they were read (i.e. bug #3 is the same as bug #1, but s/uncompressed/compressed/). The fix is the same: zero out the hole in the compressed case too, by putting a memset back in uncompress_inline, but this time with correct parameters. The last and oldest bug, bug #0, is the cause of the offending inline extent/hole/extent pattern. Bug #0 is a subtle and mostly-harmless quirk of behavior somewhere in the btrfs write code. In a few special cases, an inline extent and hole are allowed to persist where they normally would be combined with later extents in the file. A fast reproducer for bug #0 is presented below. A few offending extents are also created in the wild during large rsync transfers with the -S flag. A Linux kernel build (git checkout; make allyesconfig; make -j8) will produce a handful of offending files as well. Once an offending file is created, it can present different content to userspace each time it is read. Bug #0 is at least 4 and possibly 8 years old. I verified every vX.Y kernel back to v3.5 has this behavior. There are fossil records of this bug's effects in commits all the way back to v2.6.32. I have no reason to believe bug #0 wasn't present at the beginning of btrfs compression support in v2.6.29, but I can't easily test kernels that old to be sure. It is not clear whether bug #0 is worth fixing. A fix would likely require injecting extra reads into currently write-only paths, and most of the exceptional cases caused by bug #0 are already handled now. Whether we like them or not, bug #0's inline extents followed by holes are part of the btrfs de-facto disk format now, and we need to be able to read them without data corruption or an infoleak. So enough about bug #0, let's get back to bug #3 (this patch). An example of on-disk structure leading to data corruption found in the wild: item 61 key (606890 INODE_ITEM 0) itemoff 9662 itemsize 160 inode generation 50 transid 50 size 47424 nbytes 49141 block group 0 mode 100644 links 1 uid 0 gid 0 rdev 0 flags 0x0(none) item 62 key (606890 INODE_REF 603050) itemoff 9642 itemsize 20 inode ref index 3 namelen 10 name: DB_File.so item 63 key (606890 EXTENT_DATA 0) itemoff 8280 itemsize 1362 inline extent data size 1341 ram 4085 compress(zlib) item 64 key (606890 EXTENT_DATA 4096) itemoff 8227 itemsize 53 extent data disk byte 5367308288 nr 20480 extent data offset 0 nr 45056 ram 45056 extent compression(zlib) Different data appears in userspace during each read of the 11 bytes between 4085 and 4096. The extent in item 63 is not long enough to fill the first page of the file, so a memset is required to fill the space between item 63 (ending at 4085) and item 64 (beginning at 4096) with zero. Here is a reproducer from Liu Bo, which demonstrates another method of creating the same inline extent and hole pattern: Using 'page_poison=on' kernel command line (or enable CONFIG_PAGE_POISONING) run the following: # touch foo # chattr +c foo # xfs_io -f -c "pwrite -W 0 1000" foo # xfs_io -f -c "falloc 4 8188" foo # od -x foo # echo 3 >/proc/sys/vm/drop_caches # od -x foo This produce the following on my box: Correct output: file contains 1000 data bytes followed by zeros: 0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd * 0001740 cdcd cdcd cdcd cdcd 0000 0000 0000 0000 0001760 0000 0000 0000 0000 0000 0000 0000 0000 * 0020000 Actual output: the data after the first 1000 bytes will be different each run: 0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd * 0001740 cdcd cdcd cdcd cdcd 6c63 7400 635f 006d 0001760 5f74 6f43 7400 435f 0053 5f74 7363 7400 0002000 435f 0056 5f74 6164 7400 645f 0062 5f74 (...) Signed-off-by: Zygo Blaxell <ce3g8jdj@umail.furryterror.org> Reviewed-by: Liu Bo <bo.li.liu@oracle.com> Reviewed-by: Chris Mason <clm@fb.com> Signed-off-by: Chris Mason <clm@fb.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* NFSv4.1 respect server's max size in CREATE_SESSIONOlga Kornievskaia2017-12-201-2/+2
| | | | | | | | | | | | | [ Upstream commit 033853325fe3bdc70819a8b97915bd3bca41d3af ] Currently client doesn't respect max sizes server returns in CREATE_SESSION. nfs4_session_set_rwsize() gets called and server->rsize, server->wsize are 0 so they never get set to the sizes returned by the server. Signed-off-by: Olga Kornievskaia <kolga@netapp.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* afs: Fix afs_kill_pages()David Howells2017-12-201-3/+7
| | | | | | | | | | | | | | | | | | | | | | | | [ Upstream commit 7286a35e893176169b09715096a4aca557e2ccd2 ] Fix afs_kill_pages() in two ways: (1) If a writeback has been partially flushed, then if we try and kill the pages it contains, some of them may no longer be undergoing writeback and end_page_writeback() will assert. Fix this by checking to see whether the page in question is actually undergoing writeback before ending that writeback. (2) The loop that scans for pages to kill doesn't increase the first page index, and so the loop may not terminate, but it will try to process the same pages over and over again. Fix this by increasing the first page index to one after the last page we processed. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* afs: Fix page leak in afs_write_begin()David Howells2017-12-201-2/+5
| | | | | | | | | | | [ Upstream commit 6d06b0d25209c80e99c1e89700f1e09694a3766b ] afs_write_begin() leaks a ref and a lock on a page if afs_fill_page() fails. Fix the leak by unlocking and releasing the page in the error path. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* afs: Populate and use client modification timeMarc Dionne2017-12-202-10/+10
| | | | | | | | | | | | | | | | | | | | | | | [ Upstream commit ab94f5d0dd6fd82e7eeca5e7c8096eaea0a0261f ] The inode timestamps should be set from the client time in the status received from the server, rather than the server time which is meant for internal server use. Set AFS_SET_MTIME and populate the mtime for operations that take an input status, such as file/dir creation and StoreData. If an input time is not provided the server will set the vnode times based on the current server time. In a situation where the server has some skew with the client, this could lead to the client seeing a timestamp in the future for a file that it just created or wrote. Signed-off-by: Marc Dionne <marc.dionne@auristor.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* afs: Fix the maths in afs_fs_store_data()David Howells2017-12-201-1/+1
| | | | | | | | | | | | | | | | | | [ Upstream commit 146a1192783697810b63a1e41c4d59fc93387340 ] afs_fs_store_data() works out of the size of the write it's going to make, but it uses 32-bit unsigned subtraction in one place that gets automatically cast to loff_t. However, if to < offset, then the number goes negative, but as the result isn't signed, this doesn't get sign-extended to 64-bits when placed in a loff_t. Fix by casting the operands to loff_t. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* afs: Flush outstanding writes when an fd is closedDavid Howells2017-12-203-0/+16
| | | | | | | | | | | | [ Upstream commit 58fed94dfb17e89556b5705f20f90e5b2971b6a1 ] Flush outstanding writes in afs when an fd is closed. This is what NFS and CIFS do. Reported-by: Marc Dionne <marc.c.dionne@gmail.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* afs: Adjust mode bits processingMarc Dionne2017-12-201-1/+6
| | | | | | | | | | | | | | | | | | [ Upstream commit 627f46943ff90bcc32ddeb675d881c043c6fa2ae ] Mode bits for an afs file should not be enforced in the usual way. For files, the absence of user bits can restrict file access with respect to what is granted by the server. These bits apply regardless of the owner or the current uid; the rest of the mode bits (group, other) are ignored. Signed-off-by: Marc Dionne <marc.dionne@auristor.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* afs: Populate group ID from vnode statusMarc Dionne2017-12-201-1/+1
| | | | | | | | | | | | [ Upstream commit 6186f0788b31f44affceeedc7b48eb10faea120d ] The group was hard coded to GLOBAL_ROOT_GID; use the group ID that was received from the server. Signed-off-by: Marc Dionne <marc.dionne@auristor.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* afs: Fix missing put_page()David Howells2017-12-201-0/+1
| | | | | | | | | | | [ Upstream commit 29c8bbbd6e21daa0997d1c3ee886b897ee7ad652 ] In afs_writepages_region(), inside the loop where we find dirty pages to deal with, one of the if-statements is missing a put_page(). Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* NFSD: fix nfsd_reset_versions for NFSv4.NeilBrown2017-12-201-15/+12
| | | | | | | | | | | | | | | | | | | | [ Upstream commit 800a938f0bf9130c8256116649c0cc5806bfb2fd ] If you write "-2 -3 -4" to the "versions" file, it will notice that no versions are enabled, and nfsd_reset_versions() is called. This enables all major versions, not no minor versions. So we lose the invariant that NFSv4 is only advertised when at least one minor is enabled. Fix the code to explicitly enable minor versions for v4, change it to use nfsd_vers() to test and set, and simplify the code. Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* NFSD: fix nfsd_minorversion(.., NFSD_AVAIL)NeilBrown2017-12-201-1/+2
| | | | | | | | | | | | | | | | [ Upstream commit 928c6fb3a9bfd6c5b287aa3465226add551c13c0 ] Current code will return 1 if the version is supported, and -1 if it isn't. This is confusing and inconsistent with the one place where this is used. So change to return 1 if it is supported, and zero if not. i.e. an error is never returned. Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* ext4: fix crash when a directory's i_size is too smallChandan Rajendra2017-12-201-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | commit 9d5afec6b8bd46d6ed821aa1579634437f58ef1f upstream. On a ppc64 machine, when mounting a fuzzed ext2 image (generated by fsfuzzer) the following call trace is seen, VFS: brelse: Trying to free free buffer WARNING: CPU: 1 PID: 6913 at /root/repos/linux/fs/buffer.c:1165 .__brelse.part.6+0x24/0x40 .__brelse.part.6+0x20/0x40 (unreliable) .ext4_find_entry+0x384/0x4f0 .ext4_lookup+0x84/0x250 .lookup_slow+0xdc/0x230 .walk_component+0x268/0x400 .path_lookupat+0xec/0x2d0 .filename_lookup+0x9c/0x1d0 .vfs_statx+0x98/0x140 .SyS_newfstatat+0x48/0x80 system_call+0x58/0x6c This happens because the directory that ext4_find_entry() looks up has inode->i_size that is less than the block size of the filesystem. This causes 'nblocks' to have a value of zero. ext4_bread_batch() ends up not reading any of the directory file's blocks. This renders the entries in bh_use[] array to continue to have garbage data. buffer_uptodate() on bh_use[0] can then return a zero value upon which brelse() function is invoked. This commit fixes the bug by returning -ENOENT when the directory file has no associated blocks. Reported-by: Abdul Haleem <abdhalee@linux.vnet.ibm.com> Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* autofs: fix careless error in recent commitNeilBrown2017-12-201-1/+0
| | | | | | | | | | | | | | | | | | commit 302ec300ef8a545a7fc7f667e5fd743b091c2eeb upstream. Commit ecc0c469f277 ("autofs: don't fail mount for transient error") was meant to replace an 'if' with a 'switch', but instead added the 'switch' leaving the case in place. Link: http://lkml.kernel.org/r/87zi6wstmw.fsf@notabene.neil.brown.name Fixes: ecc0c469f277 ("autofs: don't fail mount for transient error") Reported-by: Ben Hutchings <ben.hutchings@codethink.co.uk> Signed-off-by: NeilBrown <neilb@suse.com> Cc: Ian Kent <raven@themaw.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* afs: Connect up the CB.ProbeUuidDavid Howells2017-12-161-0/+3
| | | | | | | | | | | | [ Upstream commit f4b3526d83c40dd8bf5948b9d7a1b2c340f0dcc8 ] The handler for the CB.ProbeUuid operation in the cache manager is implemented, but isn't listed in the switch-statement of operation selection, so won't be used. Fix this by adding it. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* NFS: Fix a typo in nfs_rename()Trond Myklebust2017-12-161-1/+1
| | | | | | | | | | | | [ Upstream commit d803224c84be067754db7fa58a93f36f61566493 ] On successful rename, the "old_dentry" is retained and is attached to the "new_dir", so we need to call nfs_set_verifier() accordingly. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* NFSv4: Fix client recovery when server reboots multiple timesTrond Myklebust2017-12-091-1/+0
| | | | | | | | | | | | | | | [ Upstream commit c6180a6237174f481dc856ed6e890d8196b6f0fb ] If the server reboots multiple times, the client should rely on the server to tell it that it cannot reclaim state as per section 9.6.3.4 in RFC7530 and section 8.4.2.1 in RFC5661. Currently, the client is being to conservative, and is assuming that if the server reboots while state recovery is in progress, then it must ignore state that was not recovered before the reboot. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* NFS: revalidate "." etc correctly on "open".NeilBrown2017-12-051-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | commit b688741cb06695312f18b730653d6611e1bad28d upstream. For correct close-to-open semantics, NFS must validate the change attribute of a directory (or file) on open. Since commit ecf3d1f1aa74 ("vfs: kill FS_REVAL_DOT by adding a d_weak_revalidate dentry op"), open() of "." or a path ending ".." is not revalidated reliably (except when that direct is a mount point). Prior to that commit, "." was revalidated using nfs_lookup_revalidate() which checks the LOOKUP_OPEN flag and forces revalidation if the flag is set. Since that commit, nfs_weak_revalidate() is used for NFSv3 (which ignores the flags) and nothing is used for NFSv4. This is fixed by using nfs_lookup_verify_inode() in nfs_weak_revalidate(). This does the revalidation exactly when needed. Also, add a definition of .d_weak_revalidate for NFSv4. The incorrect behavior is easily demonstrated by running "echo *" in some non-mountpoint NFS directory while watching network traffic. Without this patch, "echo *" sometimes doesn't produce any traffic. With the patch it always does. Fixes: ecf3d1f1aa74 ("vfs: kill FS_REVAL_DOT by adding a d_weak_revalidate dentry op") cc: stable@vger.kernel.org (3.9+) Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* btrfs: clear space cache inode generation alwaysJosef Bacik2017-12-051-7/+7
| | | | | | | | | | | | | | | | | | | | | commit 8e138e0d92c6c9d3d481674fb14e3439b495be37 upstream. We discovered a box that had double allocations, and suspected the space cache may be to blame. While auditing the write out path I noticed that if we've already setup the space cache we will just carry on. This means that any error we hit after cache_save_setup before we go to actually write the cache out we won't reset the inode generation, so whatever was already written will be considered correct, except it'll be stale. Fix this by _always_ resetting the generation on the block group inode, this way we only ever have valid or invalid cache. With this patch I was no longer able to reproduce cache corruption with dm-log-writes and my bpf error injection tool. Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* btrfs: return the actual error value from from btrfs_uuid_tree_iteratePan Bian2017-11-301-3/+1
| | | | | | | | | | | | | | | | | | [ Upstream commit 73ba39ab9307340dc98ec3622891314bbc09cc2e ] In function btrfs_uuid_tree_iterate(), errno is assigned to variable ret on errors. However, it directly returns 0. It may be better to return ret. This patch also removes the warning, because the caller already prints a warning. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=188731 Signed-off-by: Pan Bian <bianpan2016@163.com> Reviewed-by: Omar Sandoval <osandov@fb.com> [ edited subject ] Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* fs/9p: Compare qid.path in v9fs_test_inodeTuomas Tynkkynen2017-11-302-0/+6
| | | | | | | | | | | | | | | | | | commit 8ee031631546cf2f7859cc69593bd60bbdd70b46 upstream. Commit fd2421f54423 ("fs/9p: When doing inode lookup compare qid details and inode mode bits.") transformed v9fs_qid_iget() to use iget5_locked() instead of iget_locked(). However, the test() callback is not checking fid.path at all, which means that a lookup in the inode cache can now accidentally locate a completely wrong inode from the same inode hash bucket if the other fields (qid.type and qid.version) match. Fixes: fd2421f54423 ("fs/9p: When doing inode lookup compare qid details and inode mode bits.") Reviewed-by: Latchesar Ionkov <lucho@ionkov.net> Signed-off-by: Tuomas Tynkkynen <tuomas@tuxera.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* ext4: fix interaction between i_size, fallocate, and delalloc after a crashTheodore Ts'o2017-11-301-2/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | commit 51e3ae81ec58e95f10a98ef3dd6d7bce5d8e35a2 upstream. If there are pending writes subject to delayed allocation, then i_size will show size after the writes have completed, while i_disksize contains the value of i_size on the disk (since the writes have not been persisted to disk). If fallocate(2) is called with the FALLOC_FL_KEEP_SIZE flag, either with or without the FALLOC_FL_ZERO_RANGE flag set, and the new size after the fallocate(2) is between i_size and i_disksize, then after a crash, if a journal commit has resulted in the changes made by the fallocate() call to be persisted after a crash, but the delayed allocation write has not resolved itself, i_size would not be updated, and this would cause the following e2fsck complaint: Inode 12, end of extent exceeds allowed value (logical block 33, physical block 33441, len 7) This can only take place on a sparse file, where the fallocate(2) call is allocating blocks in a range which is before a pending delayed allocation write which is extending i_size. Since this situation is quite rare, and the window in which the crash must take place is typically < 30 seconds, in practice this condition will rarely happen. Nevertheless, it can be triggered in testing, and in particular by xfstests generic/456. Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reported-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* nfsd: deal with revoked delegations appropriatelyAndrew Elble2017-11-301-1/+24
| | | | | | | | | | | | | | | | | | | | | commit 95da1b3a5aded124dd1bda1e3cdb876184813140 upstream. If a delegation has been revoked by the server, operations using that delegation should error out with NFS4ERR_DELEG_REVOKED in the >4.1 case, and NFS4ERR_BAD_STATEID otherwise. The server needs NFSv4.1 clients to explicitly free revoked delegations. If the server returns NFS4ERR_DELEG_REVOKED, the client will do that; otherwise it may just forget about the delegation and be unable to recover when it later sees SEQ4_STATUS_RECALLABLE_STATE_REVOKED set on a SEQUENCE reply. That can cause the Linux 4.1 client to loop in its stage manager. Signed-off-by: Andrew Elble <aweits@rit.edu> Reviewed-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* nfs: Fix ugly referral attributesChuck Lever2017-11-301-10/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | commit c05cefcc72416a37eba5a2b35f0704ed758a9145 upstream. Before traversing a referral and performing a mount, the mounted-on directory looks strange: dr-xr-xr-x. 2 4294967294 4294967294 0 Dec 31 1969 dir.0 nfs4_get_referral is wiping out any cached attributes with what was returned via GETATTR(fs_locations), but the bit mask for that operation does not request any file attributes. Retrieve owner and timestamp information so that the memcpy in nfs4_get_referral fills in more attributes. Changes since v1: - Don't request attributes that the client unconditionally replaces - Request only MOUNTED_ON_FILEID or FILEID attribute, not both - encode_fs_locations() doesn't use the third bitmask word Fixes: 6b97fd3da1ea ("NFSv4: Follow a referral") Suggested-by: Pradeep Thomas <pradeepthomas@gmail.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* NFS: Fix typo in nomigration mount optionJoshua Watt2017-11-301-1/+1
| | | | | | | | | | | commit f02fee227e5f21981152850744a6084ff3fa94ee upstream. The option was incorrectly masking off all other options. Signed-off-by: Joshua Watt <JPEWhacker@gmail.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* isofs: fix timestamps beyond 2027Arnd Bergmann2017-11-303-3/+3
| | | | | | | | | | | | | | | | | | | | | commit 34be4dbf87fc3e474a842305394534216d428f5d upstream. isofs uses a 'char' variable to load the number of years since 1900 for an inode timestamp. On architectures that use a signed char type by default, this results in an invalid date for anything beyond 2027. This changes the function argument to a 'u8' array, which is defined the same way on all architectures, and unambiguously lets us use years until 2155. This should be backported to all kernels that might still be in use by that date. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* eCryptfs: use after free in ecryptfs_release_messaging()Dan Carpenter2017-11-301-3/+4
| | | | | | | | | | | | | commit db86be3a12d0b6e5c5b51c2ab2a48f06329cb590 upstream. We're freeing the list iterator so we should be using the _safe() version of hlist_for_each_entry(). Fixes: 88b4a07e6610 ("[PATCH] eCryptfs: Public key transport mechanism") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Tyler Hicks <tyhicks@canonical.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* nilfs2: fix race condition that causes file system corruptionAndreas Rohner2017-11-301-2/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | commit 31ccb1f7ba3cfe29631587d451cf5bb8ab593550 upstream. There is a race condition between nilfs_dirty_inode() and nilfs_set_file_dirty(). When a file is opened, nilfs_dirty_inode() is called to update the access timestamp in the inode. It calls __nilfs_mark_inode_dirty() in a separate transaction. __nilfs_mark_inode_dirty() caches the ifile buffer_head in the i_bh field of the inode info structure and marks it as dirty. After some data was written to the file in another transaction, the function nilfs_set_file_dirty() is called, which adds the inode to the ns_dirty_files list. Then the segment construction calls nilfs_segctor_collect_dirty_files(), which goes through the ns_dirty_files list and checks the i_bh field. If there is a cached buffer_head in i_bh it is not marked as dirty again. Since nilfs_dirty_inode() and nilfs_set_file_dirty() use separate transactions, it is possible that a segment construction that writes out the ifile occurs in-between the two. If this happens the inode is not on the ns_dirty_files list, but its ifile block is still marked as dirty and written out. In the next segment construction, the data for the file is written out and nilfs_bmap_propagate() updates the b-tree. Eventually the bmap root is written into the i_bh block, which is not dirty, because it was written out in another segment construction. As a result the bmap update can be lost, which leads to file system corruption. Either the virtual block address points to an unallocated DAT block, or the DAT entry will be reused for something different. The error can remain undetected for a long time. A typical error message would be one of the "bad btree" errors or a warning that a DAT entry could not be found. This bug can be reproduced reliably by a simple benchmark that creates and overwrites millions of 4k files. Link: http://lkml.kernel.org/r/1509367935-3086-2-git-send-email-konishi.ryusuke@lab.ntt.co.jp Signed-off-by: Andreas Rohner <andreas.rohner@gmx.net> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Tested-by: Andreas Rohner <andreas.rohner@gmx.net> Tested-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* autofs: don't fail mount for transient errorNeilBrown2017-11-301-1/+14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | commit ecc0c469f27765ed1e2b967be0aa17cee1a60b76 upstream. Currently if the autofs kernel module gets an error when writing to the pipe which links to the daemon, then it marks the whole moutpoint as catatonic, and it will stop working. It is possible that the error is transient. This can happen if the daemon is slow and more than 16 requests queue up. If a subsequent process tries to queue a request, and is then signalled, the write to the pipe will return -ERESTARTSYS and autofs will take that as total failure. So change the code to assess -ERESTARTSYS and -ENOMEM as transient failures which only abort the current request, not the whole mountpoint. It isn't a crash or a data corruption, but having autofs mountpoints suddenly stop working is rather inconvenient. Ian said: : And given the problems with a half dozen (or so) user space applications : consuming large amounts of CPU under heavy mount and umount activity this : could happen more easily than we expect. Link: http://lkml.kernel.org/r/87y3norvgp.fsf@notabene.neil.brown.name Signed-off-by: NeilBrown <neilb@suse.com> Acked-by: Ian Kent <raven@themaw.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* coda: fix 'kernel memory exposure attempt' in fsyncJan Harkes2017-11-241-2/+1
| | | | | | | | | | | | | | | | | | | | | commit d337b66a4c52c7b04eec661d86c2ef6e168965a2 upstream. When an application called fsync on a file in Coda a small request with just the file identifier was allocated, but the declared length was set to the size of union of all possible upcall requests. This bug has been around for a very long time and is now caught by the extra checking in usercopy that was introduced in Linux-4.8. The exposure happens when the Coda cache manager process reads the fsync upcall request at which point it is killed. As a result there is nobody servicing any further upcalls, trapping any processes that try to access the mounted Coda filesystem. Signed-off-by: Jan Harkes <jaharkes@cs.cmu.edu> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* ocfs2: should wait dio before inode lock in ocfs2_setattr()alex chen2017-11-241-2/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | commit 28f5a8a7c033cbf3e32277f4cc9c6afd74f05300 upstream. we should wait dio requests to finish before inode lock in ocfs2_setattr(), otherwise the following deadlock will happen: process 1 process 2 process 3 truncate file 'A' end_io of writing file 'A' receiving the bast messages ocfs2_setattr ocfs2_inode_lock_tracker ocfs2_inode_lock_full inode_dio_wait __inode_dio_wait -->waiting for all dio requests finish dlm_proxy_ast_handler dlm_do_local_bast ocfs2_blocking_ast ocfs2_generic_handle_bast set OCFS2_LOCK_BLOCKED flag dio_end_io dio_bio_end_aio dio_complete ocfs2_dio_end_io ocfs2_dio_end_io_write ocfs2_inode_lock __ocfs2_cluster_lock ocfs2_wait_for_mask -->waiting for OCFS2_LOCK_BLOCKED flag to be cleared, that is waiting for 'process 1' unlocking the inode lock inode_dio_end -->here dec the i_dio_count, but will never be called, so a deadlock happened. Link: http://lkml.kernel.org/r/59F81636.70508@huawei.com Signed-off-by: Alex Chen <alex.chen@huawei.com> Reviewed-by: Jun Piao <piaojun@huawei.com> Reviewed-by: Joseph Qi <jiangqi903@gmail.com> Acked-by: Changwei Ge <ge.changwei@h3c.com> Cc: Mark Fasheh <mfasheh@versity.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Revert "ceph: unlock dangling spinlock in try_flush_caps()"Greg Kroah-Hartman2017-11-181-4/+1
| | | | | | | | | | | | | | This reverts commit 55d4aa12af57ea7782f0c8bbc3b01e44673b05ba which is commit 6c2838fbdedb9b72a81c931d49e56b229b6cdbca upstream. The locking issue was not a problem in 3.18, and now sparse rightly complains about this being an issue, so go back to the "correct" code. Cc: Jeff Layton <jlayton@redhat.com> Cc: "Yan, Zheng" <zyan@redhat.com> Cc: Ilya Dryomov <idryomov@gmail.com> Reported-by: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* ext4: do not use stripe_width if it is not setJan Kara2017-11-081-2/+2
| | | | | | | | | | | | [ Upstream commit 5469d7c3087ecaf760f54b447f11af6061b7c897 ] Avoid using stripe_width for sbi->s_stripe value if it is not actually set. It prevents using the stride for sbi->s_stripe. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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