issues or are too minor to warrant backporting
-----BEGIN PGP SIGNATURE-----
iHUEABYIAB0WIQTTMBEPP41GrTpTJgfdBJ7gKXxAjgUCYuCV7gAKCRDdBJ7gKXxA
jrK2AQDeoayQKXJFTcEltKAUTooXM/BoRf+O3ti/xrSWpwta8wEAjaBIJ8e7UlCj
g+p6u/pd38f226ldzI5w3bIBSPCbnwU=
=3rO0
-----END PGP SIGNATURE-----
Merge tag 'mm-hotfixes-stable-2022-07-26' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull misc fixes from Andrew Morton:
"Thirteen hotfixes.
Eight are cc:stable and the remainder are for post-5.18 issues or are
too minor to warrant backporting"
* tag 'mm-hotfixes-stable-2022-07-26' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
mailmap: update Gao Xiang's email addresses
userfaultfd: provide properly masked address for huge-pages
Revert "ocfs2: mount shared volume without ha stack"
hugetlb: fix memoryleak in hugetlb_mcopy_atomic_pte
fs: sendfile handles O_NONBLOCK of out_fd
ntfs: fix use-after-free in ntfs_ucsncmp()
secretmem: fix unhandled fault in truncate
mm/hugetlb: separate path for hwpoison entry in copy_hugetlb_page_range()
mm: fix missing wake-up event for FSDAX pages
mm: fix page leak with multiple threads mapping the same page
mailmap: update Seth Forshee's email address
tmpfs: fix the issue that the mount and remount results are inconsistent.
mm: kfence: apply kmemleak_ignore_phys on early allocated pool
Commit 824ddc601a ("userfaultfd: provide unmasked address on
page-fault") was introduced to fix an old bug, in which the offset in the
address of a page-fault was masked. Concerns were raised - although were
never backed by actual code - that some userspace code might break because
the bug has been around for quite a while. To address these concerns a
new flag was introduced, and only when this flag is set by the user,
userfaultfd provides the exact address of the page-fault.
The commit however had a bug, and if the flag is unset, the offset was
always masked based on a base-page granularity. Yet, for huge-pages, the
behavior prior to the commit was that the address is masked to the
huge-page granulrity.
While there are no reports on real breakage, fix this issue. If the flag
is unset, use the address with the masking that was done before.
Link: https://lkml.kernel.org/r/20220711165906.2682-1-namit@vmware.com
Fixes: 824ddc601a ("userfaultfd: provide unmasked address on page-fault")
Signed-off-by: Nadav Amit <namit@vmware.com>
Reported-by: James Houghton <jthoughton@google.com>
Reviewed-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: James Houghton <jthoughton@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
-----BEGIN PGP SIGNATURE-----
iQJEBAABCAAuFiEEwPw5LcreJtl1+l5K99NY+ylx4KYFAmLaEsMQHGF4Ym9lQGtl
cm5lbC5kawAKCRD301j7KXHgprg0EADcHfSh4bM+37B1rHV3urn+Cmpei69/QUPo
XP9hLHFeNsokZC30JFaEN2oNiHic5oGOO9aoHSrWifnXGKScaN1ZmveGE5ctwA6B
n4mLKVjKNUAWzAG2MWFHCykxW2gXaLSfrMQNl/FIGrjnUwEVjS7b9BsORhSfeM86
AMl2he38Btr9n1PUw63RHf0tC/p0/nBg/dta95Bwu1cjhC/7gv3wBe739PKslo4c
oYimvLPobDkX60LcMXBsZbu9pwT7UR+WKcgOYtgqX9/Dq1G3KtO/mN+cOKJiTwAz
yStCQepnDqYHS9ltvBeh2a6BEtl09YFGMK8WkAVUPo21+AdmzZtAxAZtsuK9erSL
w9i3Z524rLR+PNjo0oW4QGIaLLPrQt152Q+KhCGtD69qdxf/BecO6jOiNMauWZjp
LWJW7I9bNQI8rxiSYIA4mgS8oS/8GXae2N+UYsjaMSXtJY1GMtO+ldI05y01rcJp
8/0MIqC3uhR5uFZ6VFLVGnzZuy0Tsw4KfN/Z/JMzTM5iWoCZvNXHgNTAnNbzLP6u
M3yUGlO3qEhg9UerqNSRi+rOyVNScXL6joP8nKjy+fSxOtS9uYegBKlL4fjrDAQr
fYuYnq+r9dk/Kqm6uQSuowZj8+nEwEEPbYErTLQT1GRO9A+/rIJ5a34FzKeRYWPU
bJAuWCu+BQ==
=lo96
-----END PGP SIGNATURE-----
Merge tag 'io_uring-5.19-2022-07-21' of git://git.kernel.dk/linux-block
Pull io_uring fixes from Jens Axboe:
"Fix for a bad kfree() introduced in this cycle, and a quick fix for
disabling buffer recycling for IORING_OP_READV.
The latter will get reworked for 5.20, but it gets the job done for
5.19"
* tag 'io_uring-5.19-2022-07-21' of git://git.kernel.dk/linux-block:
io_uring: do not recycle buffer in READV
io_uring: fix free of unallocated buffer list
READV cannot recycle buffers as it would lose some of the data required to
reimport that buffer.
Reported-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>
Fixes: b66e65f414 ("io_uring: never call io_buffer_select() for a buffer re-select")
Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220721131325.624788-1-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This reverts commit 912f655d78.
This commit introduced a regression that can cause mount hung. The
changes in __ocfs2_find_empty_slot causes that any node with none-zero
node number can grab the slot that was already taken by node 0, so node 1
will access the same journal with node 0, when it try to grab journal
cluster lock, it will hung because it was already acquired by node 0.
It's very easy to reproduce this, in one cluster, mount node 0 first, then
node 1, you will see the following call trace from node 1.
[13148.735424] INFO: task mount.ocfs2:53045 blocked for more than 122 seconds.
[13148.739691] Not tainted 5.15.0-2148.0.4.el8uek.mountracev2.x86_64 #2
[13148.742560] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[13148.745846] task:mount.ocfs2 state:D stack: 0 pid:53045 ppid: 53044 flags:0x00004000
[13148.749354] Call Trace:
[13148.750718] <TASK>
[13148.752019] ? usleep_range+0x90/0x89
[13148.753882] __schedule+0x210/0x567
[13148.755684] schedule+0x44/0xa8
[13148.757270] schedule_timeout+0x106/0x13c
[13148.759273] ? __prepare_to_swait+0x53/0x78
[13148.761218] __wait_for_common+0xae/0x163
[13148.763144] __ocfs2_cluster_lock.constprop.0+0x1d6/0x870 [ocfs2]
[13148.765780] ? ocfs2_inode_lock_full_nested+0x18d/0x398 [ocfs2]
[13148.768312] ocfs2_inode_lock_full_nested+0x18d/0x398 [ocfs2]
[13148.770968] ocfs2_journal_init+0x91/0x340 [ocfs2]
[13148.773202] ocfs2_check_volume+0x39/0x461 [ocfs2]
[13148.775401] ? iput+0x69/0xba
[13148.777047] ocfs2_mount_volume.isra.0.cold+0x40/0x1f5 [ocfs2]
[13148.779646] ocfs2_fill_super+0x54b/0x853 [ocfs2]
[13148.781756] mount_bdev+0x190/0x1b7
[13148.783443] ? ocfs2_remount+0x440/0x440 [ocfs2]
[13148.785634] legacy_get_tree+0x27/0x48
[13148.787466] vfs_get_tree+0x25/0xd0
[13148.789270] do_new_mount+0x18c/0x2d9
[13148.791046] __x64_sys_mount+0x10e/0x142
[13148.792911] do_syscall_64+0x3b/0x89
[13148.794667] entry_SYSCALL_64_after_hwframe+0x170/0x0
[13148.797051] RIP: 0033:0x7f2309f6e26e
[13148.798784] RSP: 002b:00007ffdcee7d408 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
[13148.801974] RAX: ffffffffffffffda RBX: 00007ffdcee7d4a0 RCX: 00007f2309f6e26e
[13148.804815] RDX: 0000559aa762a8ae RSI: 0000559aa939d340 RDI: 0000559aa93a22b0
[13148.807719] RBP: 00007ffdcee7d5b0 R08: 0000559aa93a2290 R09: 00007f230a0b4820
[13148.810659] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdcee7d420
[13148.813609] R13: 0000000000000000 R14: 0000559aa939f000 R15: 0000000000000000
[13148.816564] </TASK>
To fix it, we can just fix __ocfs2_find_empty_slot. But original commit
introduced the feature to mount ocfs2 locally even it is cluster based,
that is a very dangerous, it can easily cause serious data corruption,
there is no way to stop other nodes mounting the fs and corrupting it.
Setup ha or other cluster-aware stack is just the cost that we have to
take for avoiding corruption, otherwise we have to do it in kernel.
Link: https://lkml.kernel.org/r/20220603222801.42488-1-junxiao.bi@oracle.com
Fixes: 912f655d78c5("ocfs2: mount shared volume without ha stack")
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Acked-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Cc: <heming.zhao@suse.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
-----BEGIN PGP SIGNATURE-----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=/47A
-----END PGP SIGNATURE-----
Merge tag 'for-5.19-rc7-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs reverts from David Sterba:
"Due to a recent report [1] we need to revert the radix tree to xarray
conversion patches.
There's a problem with sleeping under spinlock, when xa_insert could
allocate memory under pressure. We use GFP_NOFS so this is a real
problem that we unfortunately did not discover during review.
I'm sorry to do such change at rc6 time but the revert is IMO the
safer option, there are patches to use mutex instead of the spin locks
but that would need more testing. The revert branch has been tested on
a few setups, all seem ok.
The conversion to xarray will be revisited in the future"
Link: https://lore.kernel.org/linux-btrfs/cover.1657097693.git.fdmanana@suse.com/ [1]
* tag 'for-5.19-rc7-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
Revert "btrfs: turn delayed_nodes_tree into an XArray"
Revert "btrfs: turn name_cache radix tree into XArray in send_ctx"
Revert "btrfs: turn fs_info member buffer_radix into XArray"
Revert "btrfs: turn fs_roots_radix in btrfs_fs_info into an XArray"
stable. Most of it is in netfs but I picked it up into ceph tree on
agreement with David.
-----BEGIN PGP SIGNATURE-----
iQFHBAABCAAxFiEEydHwtzie9C7TfviiSn/eOAIR84sFAmLRle4THGlkcnlvbW92
QGdtYWlsLmNvbQAKCRBKf944AhHziwNrB/wLIT7pDkZl2h1LclJS1WfgzgPkaOVq
sN8RO+QH3zIx5av/b3BH/R9Ilp2M4QjWr7f5y3emVZPxV9KQ2lrUj30XKecfIO4+
nGU3YunO+rfaUTyySJb06VFfhLpOjxjWGFEjgAO+exiWz4zl2h8dOXqYBTE/cStT
+721WZKYR25UK7c7kp/LgRC9QhjqH1MDm7wvPOAg6CR7mw2OiwjYD7o8Ou+zvGfp
6GimxbWouJNT+/xW2T3wIJsmQuwZbw4L4tsLSfhKTk57ooKtR1cdm0h/N7LM1bQa
fijU36LdGJGqKKF+kVJV73sNuPIZGY+KVS+ApiuOJ/LMDXxoeuiYtewT
=P3hf
-----END PGP SIGNATURE-----
Merge tag 'ceph-for-5.19-rc7' of https://github.com/ceph/ceph-client
Pull ceph fix from Ilya Dryomov:
"A folio locking fixup that Xiubo and David cooperated on, marked for
stable. Most of it is in netfs but I picked it up into ceph tree on
agreement with David"
* tag 'ceph-for-5.19-rc7' of https://github.com/ceph/ceph-client:
netfs: do not unlock and put the folio twice
This reverts commit 253bf57555.
Revert the xarray conversion, there's a problem with potential
sleep-inside-spinlock [1] when calling xa_insert that triggers GFP_NOFS
allocation. The radix tree used the preloading mechanism to avoid
sleeping but this is not available in xarray.
Conversion from spin lock to mutex is possible but at time of rc6 is
riskier than a clean revert.
[1] https://lore.kernel.org/linux-btrfs/cover.1657097693.git.fdmanana@suse.com/
Reported-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This reverts commit 4076942021.
Revert the xarray conversion, there's a problem with potential
sleep-inside-spinlock [1] when calling xa_insert that triggers GFP_NOFS
allocation. The radix tree used the preloading mechanism to avoid
sleeping but this is not available in xarray.
Conversion from spin lock to mutex is possible but at time of rc6 is
riskier than a clean revert.
[1] https://lore.kernel.org/linux-btrfs/cover.1657097693.git.fdmanana@suse.com/
Reported-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This reverts commit 8ee922689d.
Revert the xarray conversion, there's a problem with potential
sleep-inside-spinlock [1] when calling xa_insert that triggers GFP_NOFS
allocation. The radix tree used the preloading mechanism to avoid
sleeping but this is not available in xarray.
Conversion from spin lock to mutex is possible but at time of rc6 is
riskier than a clean revert.
[1] https://lore.kernel.org/linux-btrfs/cover.1657097693.git.fdmanana@suse.com/
Reported-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This reverts commit 48b36a602a.
Revert the xarray conversion, there's a problem with potential
sleep-inside-spinlock [1] when calling xa_insert that triggers GFP_NOFS
allocation. The radix tree used the preloading mechanism to avoid
sleeping but this is not available in xarray.
Conversion from spin lock to mutex is possible but at time of rc6 is
riskier than a clean revert.
[1] https://lore.kernel.org/linux-btrfs/cover.1657097693.git.fdmanana@suse.com/
Reported-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This reverts commit 4a57a84000.
Dave Chinner reports:
"As I suspected would occur, this change causes test failures. e.g
generic/517 in fstests fails with:
generic/517 1s ... - output mismatch [..]
-deduped 131172/131172 bytes at offset 65536
+deduped 131072/131172 bytes at offset 65536"
can you please revert this commit for the 5.19 series to give us more
time to investigate and consider the impact of the the API change on
userspace applications before we commit to changing the API"
That changed return value seems to reflect reality, but with the fstest
change, let's revert for now.
Requested-by: Dave Chinner <david@fromorbit.com>
Link: https://lore.kernel.org/all/20220714223238.GH3600936@dread.disaster.area/
Cc: Ansgar Lößer <ansgar.loesser@tu-darmstadt.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-----BEGIN PGP SIGNATURE-----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=FxnJ
-----END PGP SIGNATURE-----
Merge tag '5.19-rc6-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6
Pull cifs fixes from Steve French:
"Three smb3 client fixes:
- two multichannel fixes: fix a potential deadlock freeing a channel,
and fix a race condition on failed creation of a new channel
- mount failure fix: work around a server bug in some common older
Samba servers by avoiding padding at the end of the negotiate
protocol request"
* tag '5.19-rc6-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
smb3: workaround negprot bug in some Samba servers
cifs: remove unnecessary locking of chan_lock while freeing session
cifs: fix race condition with delayed threads
- Enable SETATTR(time_create) to fix regression with Mac OS clients
- Fix a lockd crasher and broken NLM UNLCK behavior
-----BEGIN PGP SIGNATURE-----
iQIzBAABCAAdFiEEKLLlsBKG3yQ88j7+M2qzM29mf5cFAmLQSzcACgkQM2qzM29m
f5d5Sg/9Hln5dSnIpgJKyhIy+ic5QB29VL9RWZ7JtVCUsWsaVObkwobmne7UWAms
X9eehGG2gYTsLcXH9oIGeLRrjbWGYbdg3B6tGMFeQZgI6NeSvBS9AeDzyG+rRTyL
2czvODorTSfYokbsHNE3kWh0Tohkvd/4wV1y5GUcLYKUj6ZO21xsSbEj7381nriJ
9nkudqgJTfCINxqRiIRBT+iCNfjvAc8EhfxP+ThcmcjJH9WeWi9kR0ZF050jloO/
JH2RZRNN+crNdg77HlXyc/jcr2G/wv/IR5G40LqeLgrJbvPAKRGAltzeyErWY7eB
6jsWf7/vil6+PfuUaPskt9h60hGe3DeBzraK4gFcEKci6YSqbE7h1GrUtM6/2E0a
5HM2mYAZfYBZyT2HitZCoFXOvGssM6543QXW2noMo/6eAWFPfdzjlN55FLNssqkq
8fPMLoiBElOvVLCYvi91CpnqSsmR4WW44dwY/d+H7DG4QnCurPGMH2OFHX3epk5J
kJzhT63GuemgwrxZICT8KQ6aVWHreHRO2LTKv9yjhEohsqkCf3eV/xlWKzcRFXLj
HQIBfQf1UIOonxOkdGUG1w0Es/Wz7btQehc/CwaMi74VUjZUp5qSMjCUWkckyALc
3k1ojcODEyR/5rOepQF4kRzOzSbm7TETwhF7YG0TRPugIGri/sQ=
=T8gK
-----END PGP SIGNATURE-----
Merge tag 'nfsd-5.19-3' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
Pull nfsd fixes from Chuck Lever:
"Notable regression fixes:
- Enable SETATTR(time_create) to fix regression with Mac OS clients
- Fix a lockd crasher and broken NLM UNLCK behavior"
* tag 'nfsd-5.19-3' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
lockd: fix nlm_close_files
lockd: set fl_owner when unlocking files
NFSD: Decode NFSv4 birth time attribute
check_write_begin() will unlock and put the folio when return
non-zero. So we should avoid unlocking and putting it twice in
netfs layer.
Change the way ->check_write_begin() works in the following two ways:
(1) Pass it a pointer to the folio pointer, allowing it to unlock and put
the folio prior to doing the stuff it wants to do, provided it clears
the folio pointer.
(2) Change the return values such that 0 with folio pointer set means
continue, 0 with folio pointer cleared means re-get and all error
codes indicating an error (no special treatment for -EAGAIN).
[ bagasdotme: use Sphinx code text syntax for *foliop pointer ]
Cc: stable@vger.kernel.org
Link: https://tracker.ceph.com/issues/56423
Link: https://lore.kernel.org/r/cf169f43-8ee7-8697-25da-0204d1b4343e@redhat.com
Co-developed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Mount can now fail to older Samba servers due to a server
bug handling padding at the end of the last negotiate
context (negotiate contexts typically are rounded up to 8
bytes by adding padding if needed). This server bug can
be avoided by switching the order of negotiate contexts,
placing a negotiate context at the end that does not
require padding (prior to the recent netname context fix
this was the case on the client).
Fixes: 73130a7b1a ("smb3: fix empty netname context on secondary channels")
Reported-by: Julian Sikorski <belegdol@gmail.com>
Tested-by: Julian Sikorski <belegdol+github@gmail.com>
Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
When using the FIDEDUPRANGE ioctl, in case of success the requested size
is returned. In some cases this might not be the actual amount of bytes
deduplicated.
This change modifies vfs_dedupe_file_range() to report the actual amount
of bytes deduplicated, instead of the requested amount.
Link: https://lore.kernel.org/linux-fsdevel/5548ef63-62f9-4f46-5793-03165ceccacc@tu-darmstadt.de/
Reported-by: Ansgar Lößer <ansgar.loesser@kom.tu-darmstadt.de>
Reported-by: Max Schlecht <max.schlecht@informatik.hu-berlin.de>
Reported-by: Björn Scheuermann <scheuermann@kom.tu-darmstadt.de>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Darrick J Wong <djwong@kernel.org>
Signed-off-by: Ansgar Lößer <ansgar.loesser@kom.tu-darmstadt.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
If dedupe of an EOF block is not constrainted to match against only
other EOF blocks with the same EOF offset into the block, it can
match against any other block that has the same matching initial
bytes in it, even if the bytes beyond EOF in the source file do
not match.
Fix this by constraining the EOF block matching to only match
against other EOF blocks that have identical EOF offsets and data.
This allows "whole file dedupe" to continue to work without allowing
eof blocks to randomly match against partial full blocks with the
same data.
Reported-by: Ansgar Lößer <ansgar.loesser@tu-darmstadt.de>
Fixes: 1383a7ed67 ("vfs: check file ranges before cloning files")
Link: https://lore.kernel.org/linux-fsdevel/a7c93559-4ba1-df2f-7a85-55a143696405@tu-darmstadt.de/
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-----BEGIN PGP SIGNATURE-----
iHUEABYKAB0WIQSQHSd0lITzzeNWNm3h3BK/laaZPAUCYs11GgAKCRDh3BK/laaZ
PAD3APsHu08aHid5O/zPnD/90BNqAo3ruvu2WhI5wa8Dacd5SwEAgoSlH2Tx3iy9
4zWK4zZX98qAGyI+ij5aejc0TvONqAE=
=4KjV
-----END PGP SIGNATURE-----
Merge tag 'ovl-fixes-5.19-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
Pull overlayfs fix from Miklos Szeredi:
"Add a temporary fix for posix acls on idmapped mounts introduced in
this cycle. A proper fix will be added in the next cycle"
* tag 'ovl-fixes-5.19-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs:
ovl: turn off SB_POSIXACL with idmapped layers temporarily
In cifs_put_smb_ses, when we're freeing the last ref count to
the session, we need to free up each channel. At this point,
it is unnecessary to take chan_lock, since we have the last
reference to the ses.
Picking up this lock also introduced a deadlock because it calls
cifs_put_tcp_ses, which locks cifs_tcp_ses_lock.
Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Acked-by: Enzo Matsumiya <ematsumiya@suse.de>
Signed-off-by: Steve French <stfrench@microsoft.com>
On failure to create a new channel, first cancel the
delayed threads, which could try to search for this
channel, and not find it.
The other option was to put the tcp session for the
channel first, before decrementing chan_count. But
that would leave a reference to the tcp session, when
it has been freed already.
So going with the former option and cancelling the
delayed works first, before rolling back the channel.
Fixes: aa45dadd34 ("cifs: change iface_list from array to sorted linked list")
Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Acked-by: Enzo Matsumiya <ematsumiya@suse.de>
Signed-off-by: Steve French <stfrench@microsoft.com>
-----BEGIN PGP SIGNATURE-----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=Cxvn
-----END PGP SIGNATURE-----
Merge tag 'for-5.19-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs fixes from David Sterba:
"A more fixes that seem to me to be important enough to get merged
before release:
- in zoned mode, fix leak of a structure when reading zone info, this
happens on normal path so this can be significant
- in zoned mode, revert an optimization added in 5.19-rc1 to finish a
zone when the capacity is full, but this is not reliable in all
cases
- try to avoid short reads for compressed data or inline files when
it's a NOWAIT read, applications should handle that but there are
two, qemu and mariadb, that are affected"
* tag 'for-5.19-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
btrfs: zoned: drop optimization of zone finish
btrfs: zoned: fix a leaked bioc in read_zone_info
btrfs: return -EAGAIN for NOWAIT dio reads/writes on compressed and inline extents
This loop condition tries a bit too hard to be clever. Just test for
the two indices we care about explicitly.
Cc: J. Bruce Fields <bfields@fieldses.org>
Fixes: 7f024fcd5c ("Keep read and write fds with each nlm_file")
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
and the remainder for longer-term issues.
-----BEGIN PGP SIGNATURE-----
iHUEABYIAB0WIQTTMBEPP41GrTpTJgfdBJ7gKXxAjgUCYsxt9wAKCRDdBJ7gKXxA
jnjWAQD6ts4tgsX+hQ5lrZjWRvYIxH/I4jbtxyMyhc+iKarotAD+NILVgrzIvr0v
ijlA4LLtmdhN1UWdSomUm3bZVn6n+QA=
=1375
-----END PGP SIGNATURE-----
Merge tag 'mm-hotfixes-stable-2022-07-11' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull hotfixes from Andrew Morton:
"Mainly MM fixes. About half for issues which were introduced after
5.18 and the remainder for longer-term issues"
* tag 'mm-hotfixes-stable-2022-07-11' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
mm: split huge PUD on wp_huge_pud fallback
nilfs2: fix incorrect masking of permission flags for symlinks
mm/rmap: fix dereferencing invalid subpage pointer in try_to_migrate_one()
riscv/mm: fix build error while PAGE_TABLE_CHECK enabled without MMU
Documentation: highmem: use literal block for code example in highmem.h comment
mm: sparsemem: fix missing higher order allocation splitting
mm/damon: use set_huge_pte_at() to make huge pte old
sh: convert nommu io{re,un}map() to static inline functions
mm: userfaultfd: fix UFFDIO_CONTINUE on fallocated shmem pages
Unlocking a POSIX lock on an inode with vfs_lock_file only works if
the owner matches. Ensure we set it in the request.
Cc: J. Bruce Fields <bfields@fieldses.org>
Fixes: 7f024fcd5c ("Keep read and write fds with each nlm_file")
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
NFSD has advertised support for the NFSv4 time_create attribute
since commit e377a3e698 ("nfsd: Add support for the birth time
attribute").
Igor Mammedov reports that Mac OS clients attempt to set the NFSv4
birth time attribute via OPEN(CREATE) and SETATTR if the server
indicates that it supports it, but since the above commit was
merged, those attempts now fail.
Table 5 in RFC 8881 lists the time_create attribute as one that can
be both set and retrieved, but the above commit did not add server
support for clients to provide a time_create attribute. IMO that's
a bug in our implementation of the NFSv4 protocol, which this commit
addresses.
Whether NFSD silently ignores the new birth time or actually sets it
is another matter. I haven't found another filesystem service in the
Linux kernel that enables users or clients to modify a file's birth
time attribute.
This commit reflects my (perhaps incorrect) understanding of whether
Linux users can set a file's birth time. NFSD will now recognize a
time_create attribute but it ignores its value. It clears the
time_create bit in the returned attribute bitmask to indicate that
the value was not used.
Reported-by: Igor Mammedov <imammedo@redhat.com>
Fixes: e377a3e698 ("nfsd: Add support for the birth time attribute")
Tested-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
As Chris explains, the comment above exit_itimers() is not correct,
we can race with proc_timers_seq_ops. Change exit_itimers() to clear
signal->posix_timers with ->siglock held.
Cc: <stable@vger.kernel.org>
Reported-by: chris@accessvector.net
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-----BEGIN PGP SIGNATURE-----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=ZK3Q
-----END PGP SIGNATURE-----
Merge tag 'io_uring-5.19-2022-07-09' of git://git.kernel.dk/linux-block
Pull io_uring fix from Jens Axboe:
"A single fix for an issue that came up yesterday that we should plug
for -rc6.
This is a regression introduced in this cycle"
* tag 'io_uring-5.19-2022-07-09' of git://git.kernel.dk/linux-block:
io_uring: check that we have a file table when allocating update slots
If IORING_FILE_INDEX_ALLOC is set asking for an allocated slot, the
helper doesn't check if we actually have a file table or not. The non
alloc path does do that correctly, and returns -ENXIO if we haven't set
one up.
Do the same for the allocated path, avoiding a NULL pointer dereference
when trying to find a free bit.
Fixes: a7c41b4687 ("io_uring: let IORING_OP_FILES_UPDATE support choosing fixed file slots")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
-----BEGIN PGP SIGNATURE-----
iQIzBAABCAAdFiEEqG5UsNXhtOCrfGQP+7dXa6fLC2sFAmLInYwACgkQ+7dXa6fL
C2tbmxAAlBkMvoIeyOlkMeAB3l1aK5CAYmgddjWOxY6UHNIGgXqWlGJCoxYngTmy
j+5Uz1mMNh7TamSJpCTXUBbiLWxzoHI34oie+NT9VUXTTVw0/GQ//jQPlvE+HeJG
Hmi0HR4lby1O6X9r63obzvDctJPhsVLdgJFtZ3UidwzgY2zYnScxwyCuwSfLUVnF
YJACZWPFj1oWxOiS2bQZgnvCJpfJ6J0I5asmO0lI1tQDS0o4RoiRvDPTx8Z6K3KO
8CSm5tvu+vYrbZ5aNCN9f0MZfNl+YZiNQyxEiIP9Phu9iZFRe9UgXvDrE9346uQM
/Vxa5nvyj+D0Hg+l1jBFXvwoKxLHTZ/BaK74h2/QzRKgxKrHTAyYOgxqt7U/YCsa
S489eHOGNwbqIKACljBcMX9YZeCdeixt4aK/VIRr+d1f2Ui30Z05ExuYOfGn4wBq
VcSsBgAALwcyqrpi61URYvKduHTa2D8ATKNKXNM/i1Wv6KQDeom5jyKj3mE7UNsI
WAgWE2xy74kjYs1Lc0izsfieyZrt1MqZiyYFjS86Cnt0wVmdAQYrQ3wciN5D9IJN
MiUYuienGRf1MNM2tmFK+N7e+pa/waKcl15/d3Zal94rlATpR2bFOI1zJ9qJ8rpi
k8B/eydAZx+oUthxWvfIdLwIREJzA49jzBHgfAy/CMjqPCj7gZ8=
=FDkz
-----END PGP SIGNATURE-----
Merge tag 'fscache-fixes-20220708' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
Pull fscache fixes from David Howells:
- Fix a check in fscache_wait_on_volume_collision() in which the
polarity is reversed. It should complain if a volume is still marked
acquisition-pending after 20s, but instead complains if the mark has
been cleared (ie. the condition has cleared).
Also switch an open-coded test of the ACQUIRE_PENDING volume flag to
use the helper function for consistency.
- Not a fix per se, but neaten the code by using a helper to check for
the DROPPED state.
- Fix cachefiles's support for erofs to only flush requests associated
with a released control file, not all requests.
- Fix a race between one process invalidating an object in the cache
and another process trying to look it up.
* tag 'fscache-fixes-20220708' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
fscache: Fix invalidation/lookup race
cachefiles: narrow the scope of flushed requests when releasing fd
fscache: Introduce fscache_cookie_is_dropped()
fscache: Fix if condition in fscache_wait_on_volume_collision()
-----BEGIN PGP SIGNATURE-----
iQJEBAABCAAuFiEEwPw5LcreJtl1+l5K99NY+ylx4KYFAmLIJGcQHGF4Ym9lQGtl
cm5lbC5kawAKCRD301j7KXHgpgS1D/9E2MxaWaHR+A35AXignJLaXxiLWlzTAwxr
/ioT6omgogbiaoTrxVZMbW+6vAPbUamXA9yqv2fC/4RERBfz3Z6UBLa8Hp6SFCMQ
vb/LSwRwnUuMr/HyF3hLjwISOi4oYs/uo3E7IpOPbpC/e0nDpJnGWx1UfQn0tJSH
WVwZsLbUe8T9fhHA0uSHbMoMSvLQGqfwwY+MET2+j+ZDwMoet194yka22jJwfDbF
l3cnUe2TQh6orRdzuagWX9WmdnWWyQM3DTqW2cSA0hepyxGMWkCMhMuyV5yqUXhD
noHshcyL76h8WQi/BwYDAGYqGy1+FkOkuV3DmVnjHVQory17Ze8ijtImMoEWpkgl
TwTTd2+o0ivcEd0JHLeqLHkTXKUENeUMTpJVuLotLMMdupIvF0jrdNWTWCM7uBto
Q9JxIkEs+16bRqT+yzC4cNuzSQRL6+qQ5jVO5BsNmJoNvs15KN7vgAQ+uR4NCCIv
GqHbTiBVsi7DYipS6jNi/bWnxDtIsNsn48WCdx52OYpd1NbkY3oEHMqBZ6rnsPJH
/uek3VLajRZfG61EMUGlazitQdW3/z31wM0iP8Y8xPyvSNCbsJkFtrNO13jpuy9p
0YRP3peXYb2eEzYpq355RSCCpyActDYp77hjcyYQP3gJcnoViZ6rBUHr5Rw5W6lN
siwWz7aNXg==
=w3SQ
-----END PGP SIGNATURE-----
Merge tag 'io_uring-5.19-2022-07-08' of git://git.kernel.dk/linux-block
Pull io_uring tweak from Jens Axboe:
"Just a minor tweak to an addition made in this release cycle: padding
a 32-bit value that's in a 64-bit union to avoid any potential
funkiness from that"
* tag 'io_uring-5.19-2022-07-08' of git://git.kernel.dk/linux-block:
io_uring: explicit sqe padding for ioctl commands
We have an optimization in do_zone_finish() to send REQ_OP_ZONE_FINISH only
when necessary, i.e. we don't send REQ_OP_ZONE_FINISH when we assume we
wrote fully into the zone.
The assumption is determined by "alloc_offset == capacity". This condition
won't work if the last ordered extent is canceled due to some errors. In
that case, we consider the zone is deactivated without sending the finish
command while it's still active.
This inconstancy results in activating another block group while we cannot
really activate the underlying zone, which causes the active zone exceeds
errors like below.
BTRFS error (device nvme3n2): allocation failed flags 1, wanted 520192 tree-log 0, relocation: 0
nvme3n2: I/O Cmd(0x7d) @ LBA 160432128, 127 blocks, I/O Error (sct 0x1 / sc 0xbd) MORE DNR
active zones exceeded error, dev nvme3n2, sector 0 op 0xd:(ZONE_APPEND) flags 0x4800 phys_seg 1 prio class 0
nvme3n2: I/O Cmd(0x7d) @ LBA 160432128, 127 blocks, I/O Error (sct 0x1 / sc 0xbd) MORE DNR
active zones exceeded error, dev nvme3n2, sector 0 op 0xd:(ZONE_APPEND) flags 0x4800 phys_seg 1 prio class 0
Fix the issue by removing the optimization for now.
Fixes: 8376d9e1ed ("btrfs: zoned: finish superblock zone once no space left for new SB")
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
The bioc would leak on the normal completion path and also on the RAID56
check (but that one won't happen in practice due to the invalid
combination with zoned mode).
Fixes: 7db1c5d14d ("btrfs: zoned: support dev-replace in zoned filesystems")
CC: stable@vger.kernel.org # 5.16+
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
[ update changelog ]
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
When doing a direct IO read or write, we always return -ENOTBLK when we
find a compressed extent (or an inline extent) so that we fallback to
buffered IO. This however is not ideal in case we are in a NOWAIT context
(io_uring for example), because buffered IO can block and we currently
have no support for NOWAIT semantics for buffered IO, so if we need to
fallback to buffered IO we should first signal the caller that we may
need to block by returning -EAGAIN instead.
This behaviour can also result in short reads being returned to user
space, which although it's not incorrect and user space should be able
to deal with partial reads, it's somewhat surprising and even some popular
applications like QEMU (Link tag #1) and MariaDB (Link tag #2) don't
deal with short reads properly (or at all).
The short read case happens when we try to read from a range that has a
non-compressed and non-inline extent followed by a compressed extent.
After having read the first extent, when we find the compressed extent we
return -ENOTBLK from btrfs_dio_iomap_begin(), which results in iomap to
treat the request as a short read, returning 0 (success) and waiting for
previously submitted bios to complete (this happens at
fs/iomap/direct-io.c:__iomap_dio_rw()). After that, and while at
btrfs_file_read_iter(), we call filemap_read() to use buffered IO to
read the remaining data, and pass it the number of bytes we were able to
read with direct IO. Than at filemap_read() if we get a page fault error
when accessing the read buffer, we return a partial read instead of an
-EFAULT error, because the number of bytes previously read is greater
than zero.
So fix this by returning -EAGAIN for NOWAIT direct IO when we find a
compressed or an inline extent.
Reported-by: Dominique MARTINET <dominique.martinet@atmark-techno.com>
Link: https://lore.kernel.org/linux-btrfs/YrrFGO4A1jS0GI0G@atmark-techno.com/
Link: https://jira.mariadb.org/browse/MDEV-27900?focusedCommentId=216582&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-216582
Tested-by: Dominique MARTINET <dominique.martinet@atmark-techno.com>
CC: stable@vger.kernel.org # 5.10+
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This cycle we added support for mounting overlayfs on top of idmapped
mounts. Recently I've started looking into potential corner cases when
trying to add additional tests and I noticed that reporting for POSIX ACLs
is currently wrong when using idmapped layers with overlayfs mounted on top
of it.
I have sent out an patch that fixes this and makes POSIX ACLs work
correctly but the patch is a bit bigger and we're already at -rc5 so I
recommend we simply don't raise SB_POSIXACL when idmapped layers are
used. Then we can fix the VFS part described below for the next merge
window so we can have good exposure in -next.
I'm going to give a rather detailed explanation to both the origin of the
problem and mention the solution so people know what's going on.
Let's assume the user creates the following directory layout and they have
a rootfs /var/lib/lxc/c1/rootfs. The files in this rootfs are owned as you
would expect files on your host system to be owned. For example, ~/.bashrc
for your regular user would be owned by 1000:1000 and /root/.bashrc would
be owned by 0:0. IOW, this is just regular boring filesystem tree on an
ext4 or xfs filesystem.
The user chooses to set POSIX ACLs using the setfacl binary granting the
user with uid 4 read, write, and execute permissions for their .bashrc
file:
setfacl -m u:4:rwx /var/lib/lxc/c2/rootfs/home/ubuntu/.bashrc
Now they to expose the whole rootfs to a container using an idmapped
mount. So they first create:
mkdir -pv /vol/contpool/{ctrover,merge,lowermap,overmap}
mkdir -pv /vol/contpool/ctrover/{over,work}
chown 10000000:10000000 /vol/contpool/ctrover/{over,work}
The user now creates an idmapped mount for the rootfs:
mount-idmapped/mount-idmapped --map-mount=b:0:10000000:65536 \
/var/lib/lxc/c2/rootfs \
/vol/contpool/lowermap
This for example makes it so that
/var/lib/lxc/c2/rootfs/home/ubuntu/.bashrc which is owned by uid and gid
1000 as being owned by uid and gid 10001000 at
/vol/contpool/lowermap/home/ubuntu/.bashrc.
Assume the user wants to expose these idmapped mounts through an overlayfs
mount to a container.
mount -t overlay overlay \
-o lowerdir=/vol/contpool/lowermap, \
upperdir=/vol/contpool/overmap/over, \
workdir=/vol/contpool/overmap/work \
/vol/contpool/merge
The user can do this in two ways:
(1) Mount overlayfs in the initial user namespace and expose it to the
container.
(2) Mount overlayfs on top of the idmapped mounts inside of the container's
user namespace.
Let's assume the user chooses the (1) option and mounts overlayfs on the
host and then changes into a container which uses the idmapping
0:10000000:65536 which is the same used for the two idmapped mounts.
Now the user tries to retrieve the POSIX ACLs using the getfacl command
getfacl -n /vol/contpool/lowermap/home/ubuntu/.bashrc
and to their surprise they see:
# file: vol/contpool/merge/home/ubuntu/.bashrc
# owner: 1000
# group: 1000
user::rw-
user:4294967295:rwx
group::r--
mask::rwx
other::r--
indicating the uid wasn't correctly translated according to the idmapped
mount. The problem is how we currently translate POSIX ACLs. Let's inspect
the callchain in this example:
idmapped mount /vol/contpool/merge: 0:10000000:65536
caller's idmapping: 0:10000000:65536
overlayfs idmapping (ofs->creator_cred): 0:0:4k /* initial idmapping */
sys_getxattr()
-> path_getxattr()
-> getxattr()
-> do_getxattr()
|> vfs_getxattr()
| -> __vfs_getxattr()
| -> handler->get == ovl_posix_acl_xattr_get()
| -> ovl_xattr_get()
| -> vfs_getxattr()
| -> __vfs_getxattr()
| -> handler->get() /* lower filesystem callback */
|> posix_acl_fix_xattr_to_user()
{
4 = make_kuid(&init_user_ns, 4);
4 = mapped_kuid_fs(&init_user_ns /* no idmapped mount */, 4);
/* FAILURE */
-1 = from_kuid(0:10000000:65536 /* caller's idmapping */, 4);
}
If the user chooses to use option (2) and mounts overlayfs on top of
idmapped mounts inside the container things don't look that much better:
idmapped mount /vol/contpool/merge: 0:10000000:65536
caller's idmapping: 0:10000000:65536
overlayfs idmapping (ofs->creator_cred): 0:10000000:65536
sys_getxattr()
-> path_getxattr()
-> getxattr()
-> do_getxattr()
|> vfs_getxattr()
| -> __vfs_getxattr()
| -> handler->get == ovl_posix_acl_xattr_get()
| -> ovl_xattr_get()
| -> vfs_getxattr()
| -> __vfs_getxattr()
| -> handler->get() /* lower filesystem callback */
|> posix_acl_fix_xattr_to_user()
{
4 = make_kuid(&init_user_ns, 4);
4 = mapped_kuid_fs(&init_user_ns, 4);
/* FAILURE */
-1 = from_kuid(0:10000000:65536 /* caller's idmapping */, 4);
}
As is easily seen the problem arises because the idmapping of the lower
mount isn't taken into account as all of this happens in do_gexattr(). But
do_getxattr() is always called on an overlayfs mount and inode and thus
cannot possible take the idmapping of the lower layers into account.
This problem is similar for fscaps but there the translation happens as
part of vfs_getxattr() already. Let's walk through an fscaps overlayfs
callchain:
setcap 'cap_net_raw+ep' /var/lib/lxc/c2/rootfs/home/ubuntu/.bashrc
The expected outcome here is that we'll receive the cap_net_raw capability
as we are able to map the uid associated with the fscap to 0 within our
container. IOW, we want to see 0 as the result of the idmapping
translations.
If the user chooses option (1) we get the following callchain for fscaps:
idmapped mount /vol/contpool/merge: 0:10000000:65536
caller's idmapping: 0:10000000:65536
overlayfs idmapping (ofs->creator_cred): 0:0:4k /* initial idmapping */
sys_getxattr()
-> path_getxattr()
-> getxattr()
-> do_getxattr()
-> vfs_getxattr()
-> xattr_getsecurity()
-> security_inode_getsecurity() ________________________________
-> cap_inode_getsecurity() | |
{ V |
10000000 = make_kuid(0:0:4k /* overlayfs idmapping */, 10000000); |
10000000 = mapped_kuid_fs(0:0:4k /* no idmapped mount */, 10000000); |
/* Expected result is 0 and thus that we own the fscap. */ |
0 = from_kuid(0:10000000:65536 /* caller's idmapping */, 10000000); |
} |
-> vfs_getxattr_alloc() |
-> handler->get == ovl_other_xattr_get() |
-> vfs_getxattr() |
-> xattr_getsecurity() |
-> security_inode_getsecurity() |
-> cap_inode_getsecurity() |
{ |
0 = make_kuid(0:0:4k /* lower s_user_ns */, 0); |
10000000 = mapped_kuid_fs(0:10000000:65536 /* idmapped mount */, 0); |
10000000 = from_kuid(0:0:4k /* overlayfs idmapping */, 10000000); |
|____________________________________________________________________|
}
-> vfs_getxattr_alloc()
-> handler->get == /* lower filesystem callback */
And if the user chooses option (2) we get:
idmapped mount /vol/contpool/merge: 0:10000000:65536
caller's idmapping: 0:10000000:65536
overlayfs idmapping (ofs->creator_cred): 0:10000000:65536
sys_getxattr()
-> path_getxattr()
-> getxattr()
-> do_getxattr()
-> vfs_getxattr()
-> xattr_getsecurity()
-> security_inode_getsecurity() _______________________________
-> cap_inode_getsecurity() | |
{ V |
10000000 = make_kuid(0:10000000:65536 /* overlayfs idmapping */, 0); |
10000000 = mapped_kuid_fs(0:0:4k /* no idmapped mount */, 10000000); |
/* Expected result is 0 and thus that we own the fscap. */ |
0 = from_kuid(0:10000000:65536 /* caller's idmapping */, 10000000); |
} |
-> vfs_getxattr_alloc() |
-> handler->get == ovl_other_xattr_get() |
|-> vfs_getxattr() |
-> xattr_getsecurity() |
-> security_inode_getsecurity() |
-> cap_inode_getsecurity() |
{ |
0 = make_kuid(0:0:4k /* lower s_user_ns */, 0); |
10000000 = mapped_kuid_fs(0:10000000:65536 /* idmapped mount */, 0); |
0 = from_kuid(0:10000000:65536 /* overlayfs idmapping */, 10000000); |
|____________________________________________________________________|
}
-> vfs_getxattr_alloc()
-> handler->get == /* lower filesystem callback */
We can see how the translation happens correctly in those cases as the
conversion happens within the vfs_getxattr() helper.
For POSIX ACLs we need to do something similar. However, in contrast to
fscaps we cannot apply the fix directly to the kernel internal posix acl
data structure as this would alter the cached values and would also require
a rework of how we currently deal with POSIX ACLs in general which almost
never take the filesystem idmapping into account (the noteable exception
being FUSE but even there the implementation is special) and instead
retrieve the raw values based on the initial idmapping.
The correct values are then generated right before returning to
userspace. The fix for this is to move taking the mount's idmapping into
account directly in vfs_getxattr() instead of having it be part of
posix_acl_fix_xattr_to_user().
To this end we simply move the idmapped mount translation into a separate
step performed in vfs_{g,s}etxattr() instead of in
posix_acl_fix_xattr_{from,to}_user().
To see how this fixes things let's go back to the original example. Assume
the user chose option (1) and mounted overlayfs on top of idmapped mounts
on the host:
idmapped mount /vol/contpool/merge: 0:10000000:65536
caller's idmapping: 0:10000000:65536
overlayfs idmapping (ofs->creator_cred): 0:0:4k /* initial idmapping */
sys_getxattr()
-> path_getxattr()
-> getxattr()
-> do_getxattr()
|> vfs_getxattr()
| |> __vfs_getxattr()
| | -> handler->get == ovl_posix_acl_xattr_get()
| | -> ovl_xattr_get()
| | -> vfs_getxattr()
| | |> __vfs_getxattr()
| | | -> handler->get() /* lower filesystem callback */
| | |> posix_acl_getxattr_idmapped_mnt()
| | {
| | 4 = make_kuid(&init_user_ns, 4);
| | 10000004 = mapped_kuid_fs(0:10000000:65536 /* lower idmapped mount */, 4);
| | 10000004 = from_kuid(&init_user_ns, 10000004);
| | |_______________________
| | } |
| | |
| |> posix_acl_getxattr_idmapped_mnt() |
| { |
| V
| 10000004 = make_kuid(&init_user_ns, 10000004);
| 10000004 = mapped_kuid_fs(&init_user_ns /* no idmapped mount */, 10000004);
| 10000004 = from_kuid(&init_user_ns, 10000004);
| } |_________________________________________________
| |
| |
|> posix_acl_fix_xattr_to_user() |
{ V
10000004 = make_kuid(0:0:4k /* init_user_ns */, 10000004);
/* SUCCESS */
4 = from_kuid(0:10000000:65536 /* caller's idmapping */, 10000004);
}
And similarly if the user chooses option (1) and mounted overayfs on top of
idmapped mounts inside the container:
idmapped mount /vol/contpool/merge: 0:10000000:65536
caller's idmapping: 0:10000000:65536
overlayfs idmapping (ofs->creator_cred): 0:10000000:65536
sys_getxattr()
-> path_getxattr()
-> getxattr()
-> do_getxattr()
|> vfs_getxattr()
| |> __vfs_getxattr()
| | -> handler->get == ovl_posix_acl_xattr_get()
| | -> ovl_xattr_get()
| | -> vfs_getxattr()
| | |> __vfs_getxattr()
| | | -> handler->get() /* lower filesystem callback */
| | |> posix_acl_getxattr_idmapped_mnt()
| | {
| | 4 = make_kuid(&init_user_ns, 4);
| | 10000004 = mapped_kuid_fs(0:10000000:65536 /* lower idmapped mount */, 4);
| | 10000004 = from_kuid(&init_user_ns, 10000004);
| | |_______________________
| | } |
| | |
| |> posix_acl_getxattr_idmapped_mnt() |
| { V
| 10000004 = make_kuid(&init_user_ns, 10000004);
| 10000004 = mapped_kuid_fs(&init_user_ns /* no idmapped mount */, 10000004);
| 10000004 = from_kuid(0(&init_user_ns, 10000004);
| |_________________________________________________
| } |
| |
|> posix_acl_fix_xattr_to_user() |
{ V
10000004 = make_kuid(0:0:4k /* init_user_ns */, 10000004);
/* SUCCESS */
4 = from_kuid(0:10000000:65536 /* caller's idmappings */, 10000004);
}
The last remaining problem we need to fix here is ovl_get_acl(). During
ovl_permission() overlayfs will call:
ovl_permission()
-> generic_permission()
-> acl_permission_check()
-> check_acl()
-> get_acl()
-> inode->i_op->get_acl() == ovl_get_acl()
> get_acl() /* on the underlying filesystem)
->inode->i_op->get_acl() == /*lower filesystem callback */
-> posix_acl_permission()
passing through the get_acl request to the underlying filesystem. This will
retrieve the acls stored in the lower filesystem without taking the
idmapping of the underlying mount into account as this would mean altering
the cached values for the lower filesystem. The simple solution is to have
ovl_get_acl() simply duplicate the ACLs, update the values according to the
idmapped mount and return it to acl_permission_check() so it can be used in
posix_acl_permission(). Since overlayfs doesn't cache ACLs they'll be
released right after.
Link: https://github.com/brauner/mount-idmapped/issues/9
Cc: Seth Forshee <sforshee@digitalocean.com>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Aleksa Sarai <cyphar@cyphar.com>
Cc: linux-unionfs@vger.kernel.org
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Fixes: bc70682a49 ("ovl: support idmapped layers")
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
32 bit sqe->cmd_op is an union with 64 bit values. It's always a good
idea to do padding explicitly. Also zero check it in prep, so it can be
used in the future if needed without compatibility concerns.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/e6b95a05e970af79000435166185e85b196b2ba2.1657202417.git.asml.silence@gmail.com
[axboe: turn bitwise OR into logical variant]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
If an NFS file is opened for writing and closed, fscache_invalidate() will
be asked to invalidate the file - however, if the cookie is in the
LOOKING_UP state (or the CREATING state), then request to invalidate
doesn't get recorded for fscache_cookie_state_machine() to do something
with.
Fix this by making __fscache_invalidate() set a flag if it sees the cookie
is in the LOOKING_UP state to indicate that we need to go to invalidation.
Note that this requires a count on the n_accesses counter for the state
machine, which that will release when it's done.
fscache_cookie_state_machine() then shifts to the INVALIDATING state if it
sees the flag.
Without this, an nfs file can get corrupted if it gets modified locally and
then read locally as the cache contents may not get updated.
Fixes: d24af13e2e ("fscache: Implement cookie invalidation")
Reported-by: Max Kellermann <mk@cm4all.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Max Kellermann <mk@cm4all.com>
Link: https://lore.kernel.org/r/YlWWbpW5Foynjllo@rabbit.intern.cm-ag [1]
When an anonymous fd is released, only flush the requests
associated with it, rather than all of requests in xarray.
Fixes: 9032b6e858 ("cachefiles: implement on-demand read")
Signed-off-by: Jia Zhu <zhujia.zj@bytedance.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://listman.redhat.com/archives/linux-cachefs/2022-June/006937.html
After waiting for the volume to complete the acquisition with timeout,
the if condition under which potential volume collision occurs should be
acquire the volume is still pending rather than not pending so that we
will continue to wait until the pending flag is cleared. Also, use the
existing test pending wrapper directly instead of test_bit().
Fixes: 62ab633523 ("fscache: Implement volume registration")
Signed-off-by: Yue Hu <huyue2@coolpad.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Link: https://listman.redhat.com/archives/linux-cachefs/2022-May/006918.html
The permission flags of newly created symlinks are wrongly dropped on
nilfs2 with the current umask value even though symlinks should have 777
(rwxrwxrwx) permissions:
$ umask
0022
$ touch file && ln -s file symlink; ls -l file symlink
-rw-r--r--. 1 root root 0 Jun 23 16:29 file
lrwxr-xr-x. 1 root root 4 Jun 23 16:29 symlink -> file
This fixes the bug by inserting a missing check that excludes
symlinks.
Link: https://lkml.kernel.org/r/1655974441-5612-1-git-send-email-konishi.ryusuke@gmail.com
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Reported-by: Tommy Pettersson <ptp@lysator.liu.se>
Reported-by: Ciprian Craciun <ciprian.craciun@gmail.com>
Tested-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
- Fix statfs blocking on background inode gc workers
- Fix some broken inode lock assertion code
- Fix xattr leaf buffer leaks when cancelling a deferred xattr update
operation
- Clean up xattr recovery to make it easier to understand.
- Fix xattr leaf block verifiers tripping over empty blocks.
- Remove complicated and error prone xattr leaf block bholding mess.
- Fix a bug where an rt extent crossing EOF was treated as "posteof"
blocks and cleaned unnecessarily.
- Fix a UAF when log shutdown races with unmount.
-----BEGIN PGP SIGNATURE-----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=8QeL
-----END PGP SIGNATURE-----
Merge tag 'xfs-5.19-fixes-4' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Pull xfs fixes from Darrick Wong:
"This fixes some stalling problems and corrects the last of the
problems (I hope) observed during testing of the new atomic xattr
update feature.
- Fix statfs blocking on background inode gc workers
- Fix some broken inode lock assertion code
- Fix xattr leaf buffer leaks when cancelling a deferred xattr update
operation
- Clean up xattr recovery to make it easier to understand.
- Fix xattr leaf block verifiers tripping over empty blocks.
- Remove complicated and error prone xattr leaf block bholding mess.
- Fix a bug where an rt extent crossing EOF was treated as "posteof"
blocks and cleaned unnecessarily.
- Fix a UAF when log shutdown races with unmount"
* tag 'xfs-5.19-fixes-4' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
xfs: prevent a UAF when log IO errors race with unmount
xfs: dont treat rt extents beyond EOF as eofblocks to be cleared
xfs: don't hold xattr leaf buffers across transaction rolls
xfs: empty xattr leaf header blocks are not corruption
xfs: clean up the end of xfs_attri_item_recover
xfs: always free xattri_leaf_bp when cancelling a deferred op
xfs: use invalidate_lock to check the state of mmap_lock
xfs: factor out the common lock flags assert
xfs: introduce xfs_inodegc_push()
xfs: bound maximum wait time for inodegc work
- Bugfixes:
- Allocate a fattr for _nfs4_discover_trunking()
- Fix module reference count leak in nfs4_run_state_manager()
-----BEGIN PGP SIGNATURE-----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=OYKI
-----END PGP SIGNATURE-----
Merge tag 'nfs-for-5.19-3' of git://git.linux-nfs.org/projects/anna/linux-nfs
Pull NFS client fixes from Anna Schumaker:
- Allocate a fattr for _nfs4_discover_trunking()
- Fix module reference count leak in nfs4_run_state_manager()
* tag 'nfs-for-5.19-3' of git://git.linux-nfs.org/projects/anna/linux-nfs:
NFSv4: Add an fattr allocation to _nfs4_discover_trunking()
NFS: restore module put when manager exits.
issue on the MDS side, but for now we are going with this one-liner
to avoid busy looping and potential soft lockups.
-----BEGIN PGP SIGNATURE-----
iQFHBAABCAAxFiEEydHwtzie9C7TfviiSn/eOAIR84sFAmK/C8MTHGlkcnlvbW92
QGdtYWlsLmNvbQAKCRBKf944AhHzi1cEB/9CiJoDsc1v+DrP/4Ud/AbI4LMffMcr
tkHmUo8ZT5D4feUzSFE6iKgb3gRCJUkYKzesywQ7Xhv7Mr6/DKB4+t9QtrympZFd
sAg775mHkL0NI6/OLnLSRva/r627PFk6f1v8OWENOjsw01PLOtWAB/B5FqlgN8tG
EQLfX0G83o4AXt4NcPCcsucPh7FxC2iKe8XWqAE6VTjkKnyz3IQHvSLweWV68U8R
ht6eun8H+slx8Kw1lSZfW/XoFGFO4uKntCh/CKKH28ZqaXrxrdsfmXSVOMlOi351
qxPfrTPgaSfvWQLbYQfPdQZCsfyyPgP2wdAVfpy56vk0yoxi2TLGBPsD
=bu9O
-----END PGP SIGNATURE-----
Merge tag 'ceph-for-5.19-rc5' of https://github.com/ceph/ceph-client
Pull ceph fix from Ilya Dryomov:
"A ceph filesystem fix, marked for stable.
There appears to be a deeper issue on the MDS side, but for now we are
going with this one-liner to avoid busy looping and potential soft
lockups"
* tag 'ceph-for-5.19-rc5' of https://github.com/ceph/ceph-client:
ceph: wait on async create before checking caps for syncfs
-----BEGIN PGP SIGNATURE-----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=Edge
-----END PGP SIGNATURE-----
Merge tag 'io_uring-5.19-2022-07-01' of git://git.kernel.dk/linux-block
Pull io_uring fixes from Jens Axboe:
"Two minor tweaks:
- While we still can, adjust the send/recv based flags to be in
->ioprio rather than in ->addr2. This is consistent with eg accept,
and also doesn't waste a full 64-bit field for flags (Pavel)
- 5.18-stable fix for re-importing provided buffers. Not much real
world relevance here as it'll only impact non-pollable files gone
async, which is more of a practical test case rather than something
that is used in the wild (Dylan)"
* tag 'io_uring-5.19-2022-07-01' of git://git.kernel.dk/linux-block:
io_uring: fix provided buffer import
io_uring: keep sendrecv flags in ioprio
KASAN reported the following use after free bug when running
generic/475:
XFS (dm-0): Mounting V5 Filesystem
XFS (dm-0): Starting recovery (logdev: internal)
XFS (dm-0): Ending recovery (logdev: internal)
Buffer I/O error on dev dm-0, logical block 20639616, async page read
Buffer I/O error on dev dm-0, logical block 20639617, async page read
XFS (dm-0): log I/O error -5
XFS (dm-0): Filesystem has been shut down due to log error (0x2).
XFS (dm-0): Unmounting Filesystem
XFS (dm-0): Please unmount the filesystem and rectify the problem(s).
==================================================================
BUG: KASAN: use-after-free in do_raw_spin_lock+0x246/0x270
Read of size 4 at addr ffff888109dd84c4 by task 3:1H/136
CPU: 3 PID: 136 Comm: 3:1H Not tainted 5.19.0-rc4-xfsx #rc4 8e53ab5ad0fddeb31cee5e7063ff9c361915a9c4
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014
Workqueue: xfs-log/dm-0 xlog_ioend_work [xfs]
Call Trace:
<TASK>
dump_stack_lvl+0x34/0x44
print_report.cold+0x2b8/0x661
? do_raw_spin_lock+0x246/0x270
kasan_report+0xab/0x120
? do_raw_spin_lock+0x246/0x270
do_raw_spin_lock+0x246/0x270
? rwlock_bug.part.0+0x90/0x90
xlog_force_shutdown+0xf6/0x370 [xfs 4ad76ae0d6add7e8183a553e624c31e9ed567318]
xlog_ioend_work+0x100/0x190 [xfs 4ad76ae0d6add7e8183a553e624c31e9ed567318]
process_one_work+0x672/0x1040
worker_thread+0x59b/0xec0
? __kthread_parkme+0xc6/0x1f0
? process_one_work+0x1040/0x1040
? process_one_work+0x1040/0x1040
kthread+0x29e/0x340
? kthread_complete_and_exit+0x20/0x20
ret_from_fork+0x1f/0x30
</TASK>
Allocated by task 154099:
kasan_save_stack+0x1e/0x40
__kasan_kmalloc+0x81/0xa0
kmem_alloc+0x8d/0x2e0 [xfs]
xlog_cil_init+0x1f/0x540 [xfs]
xlog_alloc_log+0xd1e/0x1260 [xfs]
xfs_log_mount+0xba/0x640 [xfs]
xfs_mountfs+0xf2b/0x1d00 [xfs]
xfs_fs_fill_super+0x10af/0x1910 [xfs]
get_tree_bdev+0x383/0x670
vfs_get_tree+0x7d/0x240
path_mount+0xdb7/0x1890
__x64_sys_mount+0x1fa/0x270
do_syscall_64+0x2b/0x80
entry_SYSCALL_64_after_hwframe+0x46/0xb0
Freed by task 154151:
kasan_save_stack+0x1e/0x40
kasan_set_track+0x21/0x30
kasan_set_free_info+0x20/0x30
____kasan_slab_free+0x110/0x190
slab_free_freelist_hook+0xab/0x180
kfree+0xbc/0x310
xlog_dealloc_log+0x1b/0x2b0 [xfs]
xfs_unmountfs+0x119/0x200 [xfs]
xfs_fs_put_super+0x6e/0x2e0 [xfs]
generic_shutdown_super+0x12b/0x3a0
kill_block_super+0x95/0xd0
deactivate_locked_super+0x80/0x130
cleanup_mnt+0x329/0x4d0
task_work_run+0xc5/0x160
exit_to_user_mode_prepare+0xd4/0xe0
syscall_exit_to_user_mode+0x1d/0x40
entry_SYSCALL_64_after_hwframe+0x46/0xb0
This appears to be a race between the unmount process, which frees the
CIL and waits for in-flight iclog IO; and the iclog IO completion. When
generic/475 runs, it starts fsstress in the background, waits a few
seconds, and substitutes a dm-error device to simulate a disk falling
out of a machine. If the fsstress encounters EIO on a pure data write,
it will exit but the filesystem will still be online.
The next thing the test does is unmount the filesystem, which tries to
clean the log, free the CIL, and wait for iclog IO completion. If an
iclog was being written when the dm-error switch occurred, it can race
with log unmounting as follows:
Thread 1 Thread 2
xfs_log_unmount
xfs_log_clean
xfs_log_quiesce
xlog_ioend_work
<observe error>
xlog_force_shutdown
test_and_set_bit(XLOG_IOERROR)
xfs_log_force
<log is shut down, nop>
xfs_log_umount_write
<log is shut down, nop>
xlog_dealloc_log
xlog_cil_destroy
<wait for iclogs>
spin_lock(&log->l_cilp->xc_push_lock)
<KABOOM>
Therefore, free the CIL after waiting for the iclogs to complete. I
/think/ this race has existed for quite a few years now, though I don't
remember the ~2014 era logging code well enough to know if it was a real
threat then or if the actual race was exposed only more recently.
Fixes: ac983517ec ("xfs: don't sleep in xlog_cil_force_lsn on shutdown")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Linus Torvalds
Nadav Amit
Dylan Yudaken
Junxiao Bi
Andrei Vagin
ChenXiaoSong
David Sterba
Xiubo Li
Steve French
Ansgar Lößer
Dave Chinner
Shyam Prasad N
Jeff Layton
Chuck Lever
Oleg Nesterov
Jens Axboe
Naohiro Aota
Christoph Hellwig
Filipe Manana
Christian Brauner
Pavel Begunkov
David Howells
Jia Zhu
Yue Hu
Yue Hu
Ryusuke Konishi
Darrick J. Wong