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1220 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
Linus Torvalds
|
5e1287972b |
vfs-7.3-rc3.fixes
Please consider pulling these changes from the signed vfs-7.3-rc3.fixes tag.
Thanks!
Christian
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Merge tag 'vfs-7.3-rc3.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
Pull vfs fixes from Christian Brauner:
- netfs:
- Fix an uninitialized return value in netfs_unbuffered_write()
when preparing the first subrequest fails
- For partial unbuffered/DIO writes return the amount transferred
rather than an error
- Update i_size with the amount actually written when a partial
transfer ends in an error
- Fix a subrequest reference leak when the io_iter ends up empty
- Handle netfs_alloc_subrequest() failure during unbuffered writes
- Load all readahead folios into the rolling buffer upfront and
drop the readahead references once the first subrequest is
dispatched
- Mark folios for copy-to-cache while issuing subrequests
- Fix read progress reporting
- afs:
- Add the missing kunmap in the error path of afs_dir_search_bucket()
- Fix a double kunmap in afs_edit_dir_remove()
- Don't free an existing server's endpoint state when cleaning up a
candidate server in afs_lookup_server()
- Unbind peers removed from a server's address list
- ufs:
- Load the cylinder group metadata before creating the root dentry
- Validate the cylinder group index and rotor positions before
caching them
- Treat an unreadable directory block as not empty
- exec:
- Close the close-on-exec files before taking exec_update_lock
Closing a file can block on the filesystem, so a hung filesystem
blocked everything that takes exec_update_lock and a FUSE server
inspecting the calling process could deadlock
- Drop the bprm loader before closing bprm->file in free_bprm()
- exit: Hold a reference to thread_pid across proc_flush_pid()
- reboot: Fix a use-after-free on cad_pid
- nsfs: Keep the namespace tree fields out of the rcu_head used by
kfree_rcu()
- nstree: Check listing permission before taking a namespace
reference in listns()
- super: Return 0 when a nested thaw drops its hold while other
freezers remain
- ext4: Don't set I_METADATA_WRITEBACK during fastcommit replay
- adfs: Free s_fs_info in ->kill_sb()
- autofs: Free the inode info allocated in autofs_fill_super() when
the root inode allocation fails
- ovl: Return EINVAL instead of EIO on a user namespace mismatch now
that it's a plain refusal and not an internal error
- cachefiles: Don't cast the variable-length coherency data to a
__be64 in the coherency tracepoint
* tag 'vfs-7.3-rc3.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (28 commits)
nstree: check listing permission before taking a namespace reference
exec: do_close_on_exec() before taking exec_update_lock
exit: hold a reference to thread_pid across proc_flush_pid
fs: autofs: fix memory leak in autofs_fill_super()
exec: Drop bprm loader before closing bprm->file
afs: Clear stale peer app data after address list changes
afs: Fix incorrect free in candidate cleanup in afs_lookup_server()
afs: Fix double-unmap of directory block
afs: Fix missing kunmap in afs_dir_search_bucket()
ovl: return EINVAL instead of EIO in case of mismatched user_ns
reboot: fix cad_pid use-after-free race
cachefiles: Fix potential UAF/KASAN warning
netfs: Fix read progress reporting
netfs: Mark folios with COPY_TO_CACHE whilst issuing subreqs
netfs: Fix readahead synchronisation issues by loading all folios upfront
netfs: break unbuffered write when netfs_alloc_subrequest() fails
netfs: Fix subreq ref leak
netfs: Fix i_size update for partial transfer
netfs: Fix error vs transferred passed to ->ki_complete()
netfs: Fix unbuffered/DIO write partial transfer error return
...
|
||
|
Kees Cook
|
3a2c4d55e3 |
treewide: refresh kmalloc_obj() conversions
This is another run of the Coccinelle script for converting kmalloc() family of allocations to kmalloc_obj() via the existing rules in scripts/coccinelle/api/kmalloc_objs.cocci This catches both the set of kmalloc() uses added since the first kmalloc_obj() conversions in v7.0 and adds a large group missed in the first pass due to Coccinelle not interacting well with the cleanup.h scoped_...() family of macros[1]. I worked around this with spatch's "--macro-file" argument to a file with all the scoped_...() macros mapped to Coccinelle's YACFE_ITERATOR[2] as that was the closest viable control flow indicator I could find. Build tested allmodconfig on x86, arm64, arm, loongarch, mips, powerpc, riscv, and s390 with no new warnings. Link: https://lore.kernel.org/lkml/202609021314.8A9C0B8@keescook/ [1] Link: https://github.com/coccinelle/coccinelle/blob/master/standard.h [2] Signed-off-by: Kees Cook <kees+treewide@kernel.org> |
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|
Chengfeng Ye
|
ba0623fc19
|
afs: Clear stale peer app data after address list changes
afs_fs_probe_fileserver() fetches the current endpoint state under
server->fs_lock, but leaves old_alist as NULL. Consequently,
afs_set_peer_appdata() treats every address list replacement as initial
setup and only binds the new peers; it never unbinds peers removed from
the old list.
An address refresh can therefore proceed as follows. CPU 0 replaces
server S's list and drops Pold without clearing Pold->app_data. The
server destroyer then clears only S's current peers and lets S reach its
RCU callback. After the callback frees S, CPU 1 handles a callback
through an RxRPC connection that still pins Pold, reads Pold->app_data,
and calls afs_use_server() on the freed object.
KASAN reported:
BUG: KASAN: slab-use-after-free in afs_find_server+0x3c/0xa0
Read of size 4 at addr ffff8881013e1af0 by task krxrpcio/7001/74
Call Trace:
afs_find_server+0x3c/0xa0
afs_rx_new_call+0x15c/0x390
rxrpc_new_incoming_call+0x97c/0x1730
rxrpc_input_packet.constprop.0+0xd03/0xec0
rxrpc_io_thread+0x967/0x1640
Allocated by task 93:
afs_lookup_server+0x1a7/0x14c0
afs_alloc_server_list+0x43f/0xb60
afs_create_volume+0x923/0x1490
afs_get_tree+0x1c6/0x10a0
Freed by task 0:
kfree+0x131/0x3c0
rcu_core+0x50a/0x1850
Last potentially related work creation:
__call_rcu_common.constprop.0+0x71/0xa10
afs_put_server+0x213/0x2b0
Preserve old->addresses for the peer app-data update so that removed
peers are cleared before the endpoint state is replaced. Also advance
both cursors when the old and new lists share a peer; activating the
old/new comparison without this would otherwise loop forever on the
shared entry.
Fixes:
|
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David Howells
|
044d596094
|
afs: Fix incorrect free in candidate cleanup in afs_lookup_server()
Fix afs_lookup_server() to not free an existing server's endpoint state
when cleaning up a candidate server. The candidate record doesn't have an
endpoint state yet at this point, so the free for that can just be removed.
Fixes:
|
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David Howells
|
e3cfd3eb7d
|
afs: Fix double-unmap of directory block
Fix afs_edit_dir_remove() to use a cleanup function to unmap the block
pointed to by afs_dir_iter::block if it's left pointing to something rather
than manually kunmapping the blocks. Manually kunmapping without clearing
iter.blocks can result in a double-kunmap if afs_dir_find_block() is called
twice in a row (which would be the case if the block being modified is not
first in the hash chain).
Fixes:
|
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David Howells
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950ae84b5c
|
afs: Fix missing kunmap in afs_dir_search_bucket()
Fix afs_dir_search_bucket() to kunmap the block it's using in the "bad:"
path.
Fixes:
|
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|
Linus Torvalds
|
1c3e8cef79 |
vfs-7.3-rc1.misc
Please consider pulling these changes from the signed vfs-7.3-rc1.misc tag.
Thanks!
Christian
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Merge tag 'vfs-7.3-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
Pull misc vfs updates from Christian Brauner:
"Bigger cleanups:
- The lockref dead-count handling is tidied up.
The open-coded check for a count below zero as the dead marker
relies on information the caller should not have.
- make put_mnt_ns() leave mounts connected. Destroying a mount
namespace disconnected its mounts from their mount points. So a
file descriptor still open on the parent of a mount point could be
used to peek under it.
Locked mounts were already kept connected to prevent exactly that.
But a mount is only locked when its tree is copied across a user
namespace boundary. So a mount namespace set up by a privileged
component had no locked mounts and its mounts were disconnected.
Passing UMOUNT_CONNECTED keeps every mount connected and prevents
that bug.
- vfs_prepare_mode() passes S_IFDIR for directories. I meant to fix
that ago but didn't get to it. So now someone finally did it.
This kills the exception where the mode could be 0 when a directory
was created whereas every other creation operation passed it
explicitly already.
- move long delayed work for ufs, jffs2, hfsplus, hfs and affs from
the per-cpu system_long_wq to the new unbound system_dfl_long_wq.
None of that work relies on per-cpu state and the work item is
enqueued with queue_delayed_work() whose timer is global anyway. So
it may as well benefit from scheduler task placement.
Smaller fixes and cleanups:
- unlock_buffer() and journal_end_buffer_io_sync() use
clear_and_wake_up_bit()
- the pipe page pools are unified into a single per-pipe pool and the
extra wake_up(rd_wait) is limited to EPOLLET consumers
- eventpoll now computes its timer slack lazily in ep_poll()
- shrink_dcache_for_umount() keeps making progress on busy roots
- excess xarray nodes are freed in clear_inode()
- romfs detects hard link cycles
- the user path of nested backing files is fixed
- pidfd holds exec_update_lock around the namespace ioctl
- non-memcg-aware nr_cached_objects is skipped during memcg slab
shrink
- iomap_write_iter() always returns status
- mangle_path() is renamed to seq_mangle_path()
- inode timestamp accessors are annotated
- new regression test for pipe->poll_usage.
- a few documentation, kernel-doc and selftest fixes"
* tag 'vfs-7.3-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (67 commits)
selftests/namespaces: Fix racy pipe handshake in timens and pidns_separate
selftests/epoll: add a regression test for pipe->poll_usage
pipe: only enable the extra wake_up(rd_wait) for EPOLLET consumers
pidfd: hold exec_update_lock around namespace ioctl
fs: fix user path of nested backing files
fs: remove stale inode_insert5() kernel-doc parameter
fs: fix switch/case indentation in sysfs() syscall
fs: document semantics of kstat::{uid,gid} fields
dcache: keep shrink_dcache_for_umount() making progress on busy roots
seq_file: rename mangle_path to seq_mangle_path
nstree: add/fix struct ns_id_req kernel-doc member fields
dcache: use lockref routines for dead count checks
lockref: tidy up dead count handling
initramfs: fix typo in reserve_initrd_mem comment
fs/pipe: unify the page pools into a single per-pipe pool
fs: annotate inode timestamp accessors
eventpoll: compute timer slack lazily in ep_poll()
selftests/filesystems: add mntns cleanup test
put_mnt_ns(): leave mounts connected
affs: Move long delayed work on system_dfl_long_wq
...
|
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|
Linus Torvalds
|
ab5ed08f2d |
vfs-7.3-rc1.lookup
Please consider pulling these changes from the signed vfs-7.3-rc1.lookup tag. Thanks! Christian -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQRAhzRXHqcMeLMyaSiRxhvAZXjcogUCan7RJQAKCRCRxhvAZXjc ouj6AQCnBHstCt5RRimywLYU+eTmdKe203zRQYxXpwlYOAzm7wEAm1mIC7/Of6bD jkiJilcPDcyYcJsqwBw/Vcz5HR+v8wo= =TX6K -----END PGP SIGNATURE----- Merge tag 'vfs-7.3-rc1.lookup' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs Pull vfs lookup updates from Christian Brauner: "This refactors lookup_open() and adds vfs_lookup_open() for nfsd. mnt_want_write() and parent locking are moved into lookup_open() itself. audit_inode_child() is also now called in lookup_open() on failure. That is the calling convention in vfs_create() and vfs_mkdir(), but lookup_open() made no such call when atomic_open() should have created a file and did not. And neither did the regular ->create() path fwiw. This also contains work to remove the unneeded excl argument from the ->create() inode op" * tag 'vfs-7.3-rc1.lookup' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: fs/namei.c: fix coding style in atomic_open() and lookup_open() fs/namei.c: fix kerneldoc of atomic_open() and vfs_lookup_open() fs/namei.c: update stale comments in lookup_open() Remove excl arg to ->create inode_operation fs/namei.c: update kerneldoc of atomic_open() vfs: call audit_inode_child() in lookup_open() on failure vfs: move create error && negative dentry case in lookup_open() up VFS: add vfs_lookup_open() for nfsd VFS: move delegated_inode retry loop into lookup_open() VFS: move mnt_want_write() and locking into lookup_open() |
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NeilBrown
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b2f1e6301e
|
Remove excl arg to ->create inode_operation
The only time that 'false' is passed as the 'excl' arg to the ->create inode_operation is in lookup_open() when ->atomic_open is not provided by the parent directory. *all* directory inode_operations which do not have ->atomic_open completely ignore the 'excl' arg. Therefore we don't need the 'excl' arg. Those few ->create operations which pay attention to the arg are only ever called with a value of 'true'. We remove that arg and change all ->create operations to behave as those thhe arg were 'true'. Signed-off-by: NeilBrown <neil@brown.name> Link: https://patch.msgid.link/178290671516.27465.15984496764174914338@noble.neil.brown.name Reviewed-by: Jori Koolstra <jkoolstra@xs4all.nl> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org> |
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David Howells
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4af1ec68d5
|
afs: Fix UAF when sending a message
In afs_make_call(), there's a race with async call reception and destruction. If a call is dispatched that doesn't have call->write_iter set (used to specify the data content for FS.StoreData), then the first rxrpc_kernel_send_data() will not set MSG_MORE in the msghdr. Once rxrpc_send_data() queues the last request packet, the response could come in at any time and cause the call to be completed and put. However, afs_make_call() will look at the call again to see it ->write_iter should be handled - something it's only allowed to do if it has its own ref on the call. Whilst this is the case for synchronous calls, it isn't true for async calls such as FS.FetchData. There's also a potential UAF in afs_make_call() in the event that an asynchronous call is being sent, but the call fails in some way (e.g. it gets aborted from the server). The problem there is that afs_make_call() tries to abort a call if the rxrpc send fails, but the asynchronous notification from rxrpc may have caused the afs_call to be torn down. generic/650 plays games with randomly taking CPUs offline, and can interject a significant delay such that the call is deallocated before afs_make_call() gets to check call->write_iter - and a UAF ensues (caught by KASAN). BUG: KASAN: slab-use-after-free in afs_make_call+0x1c90/0x2210 [kafs] Read of size 8 at addr ffff888035e050e8 by task fsstress/1409 Fix this by making afs_make_op_call() give the op->call its own ref rather than transferring the caller's ref to it and then dropping the ref when afs_make_call() returns. This also means that the afs_make_call() func never loses its ref on the call now. Fixes: |
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David Howells
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222052c6be
|
afs: Fix afs_fs_fetch_data() to subtract transferred from len
Fix afs_fs_fetch_data() to subtract subreq->transferred from subreq->len
rather than adding it.
Fixes:
|
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David Howells
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d568a43f6d
|
afs: Fix afs_fs_fetch_data() to set call->async
Fix afs_fs_fetch_data() to set call->async on an async operation as does
afs_fs_fetch_data64().
Fixes:
|
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David Howells
|
62d9853aa4 |
afs: Fix afs_edit_dir_remove() to get, not find, block 0
Fix afs_edit_dir_remove() to use afs_dir_get_block() to get block 0 rather
than afs_dir_find_block() as the latter caches the found block in the
afs_dir_iter and may[*] switch out the page it's on if another
afs_dir_find_block() is done. This parallels what afs_edit_dir_add() does.
[*] There's more than one block per page.
Fixes:
|
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David Howells
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41376400c4
|
netfs: Replace wb_lock with a bit lock for asynchronicity
The netfs_inode::wb_lock mutex is used to prevent multiple simultaneous writebacks from fighting each other (a writeback thread will write multiple discontiguous regions within the same request). The mutex, however, only serialises the issuing of subrequests; it doesn't serialise the collection of results, and, in particular, the updating of file size information and fscache populatedness data. Unfortunately, the mutex cannot be held around the entire process as it has to be unlocked in the same thread in which it is locked - and we don't want to hold up the allocator whilst we complete the writeback. Fix this by replacing the mutex with a bit flag and a list of lock waiters so that the lock can be dropped in the collector thread after collection is complete. Link: https://sashiko.dev/#/patchset/20260608145432.681865-1-dhowells%40redhat.com Signed-off-by: David Howells <dhowells@redhat.com> Link: https://patch.msgid.link/20260625140640.3116900-12-dhowells@redhat.com cc: Paulo Alcantara <pc@manguebit.org> cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org> |
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David Howells
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903d37c972
|
afs: Fix unchecked-length string display in debug statement
Fix afs_extract_vlserver_list() to limit the length of the displayed
string in a debug statement().
Fixes:
|
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David Howells
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56b4e4b26f
|
afs: Fix the volume AFS_VOLUME_RM_TREE is set on
Fix afs_insert_volume_into_cell() to set AFS_VOLUME_RM_TREE on the volume
replaced, not the new volume, as it's now removed from the cell's volume
tree. This will cause the old volume to be removed from the tree twice and
the new volume never to be removed.
Fixes:
|
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David Howells
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26f17ce6fa
|
afs: Fix premature cell exposure through /afs
AFS cell records are prematurely exposured through the /afs dynamic root by
virtue of adding them immediately to the net->cells_dyn_ino IDR when the
cell is allocated rather than when it is added to the lookup tree. This
allows a candidate record to be accessed, even if it's actually a duplicate
or not published yet.
Fix this by not adding the cell to cells_dyn_ino until it's confirmed
non-duplicate and is being published. A flag is then used to record
whether it is added to the IDR to make removal from the IDR conditional.
Closes: https://sashiko.dev/#/patchset/20260618155141.2513212-1-dhowells%40redhat.com
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://patch.msgid.link/20260622090856.2746629-20-dhowells@redhat.com
Fixes:
|
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David Howells
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55e841836c
|
afs: Fix lack of locking around modifications of net->cells_dyn_ino
Fix the lack of locking around modifications of net->cells_dyn_ino by
taking net->cells_lock exclusively. This also requires to cell to be
removed from net->cells_dyn_ino in afs_destroy_cell_work() rather than in
afs_cell_destroy() as the latter runs in RCU cleanup context and sleeping
locks cannot be taken there.
Fixes:
|
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David Howells
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fc10c0ecf0
|
afs: Fix vllist leak
Fix a leak of the new vllist in afs_update_cell() in the event that it is an
empty list (nr_servers == 0), in which case the old list isn't displaced
unless the old list is also empty.
Fixes:
|
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David Howells
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d672c276f6
|
afs: Fix leak of ungot volume
Fix afs_lookup_volume_rcu() so that it doesn't leak a dying volume if
afs_try_get_volume() fails.
Fixes:
|
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David Howells
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794a011103
|
afs: Fix missing NULL pointer check in afs_break_some_callbacks()
Fix afs_break_some_callbacks() to check to see if afs_lookup_volume_rcu()
returned NULL (e.g. the specified volume is unknown).
Fixes:
|
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David Howells
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3b1601471a
|
afs: Use scoped_seqlock_read() rather than manually doing seqlock stuff
This is an addendum to the patch to remove the erroneous seq |= 1 in volume lookup loop. Switch to using scoped_seqlock_read() as suggested by Oleg Nesterov[1]. Signed-off-by: David Howells <dhowells@redhat.com> Link: https://lore.kernel.org/r/aifaeKvz3KemfzaS@redhat.com/ [1] Link: https://patch.msgid.link/20260622090856.2746629-15-dhowells@redhat.com Reviewed-by: Oleg Nesterov <oleg@redhat.com> cc: Marc Dionne <marc.dionne@auristor.com> cc: Li RongQing <lirongqing@baidu.com> cc: linux-afs@lists.infradead.org Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org> |
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David Howells
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0f36469d7c
|
afs: Fix callback service message parsers to pass through -EAGAIN
The AFS filesystem client uses an rxrpc server to listen for callback
notifications. Each callback call type handler has a delivery function
that parses the incoming request stream, and this should return -EAGAIN the
last packet hasn't yet been seen, but all currently queued received data is
consumed. afs_extract_data() does this, but the -EAGAIN return is switched
to 0 inadvertantly
Fix callback service message parsers to pass through -EAGAIN
Fixes:
|
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David Howells
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5597fbd1e7
|
afs: Fix reinitialisation of the inode, in particular ->lock_work
It seems that initalising afs_vnode::lock_work a single time in the slab's
init function isn't sufficient for work_structs. This results in the
DEBUG_OBJECTS debugging stuff producing a warning occasionally when running
the generic/131 xfstest:
ODEBUG: activate not available (active state 0) object: 0000000016d8760f object type: work_struct hint: afs_lock_work+0x0/0x220
WARNING: lib/debugobjects.c:629 at debug_print_object+0x4b/0x90, CPU#3: locktest/7695
...
CPU: 3 UID: 0 PID: 7695 Comm: locktest Tainted: G S 7.1.0-build3+ #2771 PREEMPT
...
RIP: 0010:debug_print_object+0x65/0x90
...
Call Trace:
<TASK>
? __pfx_afs_lock_work+0x10/0x10
debug_object_activate+0x122/0x170
insert_work+0x25/0x60
__queue_work+0x2e0/0x340
queue_delayed_work_on+0x48/0x70
afs_fl_release_private+0x57/0x70
locks_release_private+0x5c/0xa0
locks_free_lock+0xe/0x20
posix_lock_inode+0x55f/0x5b0
locks_lock_inode_wait+0x81/0x140
? file_write_and_wait_range+0x50/0x70
afs_lock+0xcd/0x110
fcntl_setlk+0x10d/0x260
do_fcntl+0x24e/0x5b0
__do_sys_fcntl+0x6a/0x90
do_syscall_64+0x11e/0x310
entry_SYSCALL_64_after_hwframe+0x71/0x79
Fix this by reinitialising ->lock_work after allocating an inode.
Also, flush ->lock_work when the inode is being evicted to make sure it's
not still running.
Fixes:
|
||
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David Howells
|
c9c3b615a4
|
afs: Fix misplaced inc of net->cells_outstanding
Fix net->cells_outstanding being incremented before the check for failure
of idr_alloc_cyclic(), leaving the count incremented on error.
Fixes:
|
||
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David Howells
|
2f79d1b93c
|
afs: Fix bulk lookup malfunction due to change in dir_emit() API
afs_do_lookup() and afs_do_lookup_one() use the same directory parsing code as afs_readdir() and were supplying alternative dir_context actors to retrieve dirents, but because lookup needs the vnode's uniquifier as part of the reference, but not the DT flags, the uniquifier was being passed in the dt flags argument to the lookup actors. Unfortunately, commit |
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Yuto Ohnuki
|
680ba02073
|
afs: check for duplicate servers in VL server list
The DNS response may contain the same server more than once. Check for duplicates by name and port before inserting into the list to avoid duplicate entries. Addresses the TODO comment in afs_extract_vlserver_list(). Signed-off-by: Yuto Ohnuki <ytohnuki@amazon.com> Signed-off-by: David Howells <dhowells@redhat.com> Link: https://patch.msgid.link/20260622090856.2746629-10-dhowells@redhat.com cc: Marc Dionne <marc.dionne@auristor.com> cc: linux-afs@lists.infradead.org Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org> |
||
|
Li RongQing
|
a58edda50a
|
afs: Remove erroneous seq |= 1 in volume lookup loop
The `seq |= 1` operation in the volume lookup loop is incorrect because:
seq is already incremented at start, making it odd in next iteration
which triggers lock, but The `|= 1` operation causes seq to be even
and unintended lockless operation
Remove this erroneous operation to maintain proper lock sequencing.
Fixes:
|
||
|
Zilin Guan
|
cb39654926
|
afs: use kvfree() to free memory allocated by kvcalloc()
op->more_files is allocated with kvcalloc() but released via
afs_put_operation(), which uses kfree() internally. This mismach prevents
the resource from being released properly and may lead to undefined
behavior.
Fix this by using kvfree() to free op->more_files to match its allocation
method.
Fixes:
|
||
|
David Howells
|
35b177ef54
|
afs: Fix directory inode initialisation order
Fix afs_inode_init_from_status() to call afs_set_netfs_context() before the
switch to do file type-specific initialisation because local directory
changes don't get uploaded to the server, only stored in the cache.
This requires that the file size be set before, so move that up too.
Without this, NETFS_ICTX_SINGLE_NO_UPLOAD as set on directories gets
clobbered.
Closes: https://sashiko.dev/#/patchset/20260618074903.2374756-1-dhowells%40redhat.com
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://patch.msgid.link/20260622090856.2746629-7-dhowells@redhat.com
Fixes:
|
||
|
David Howells
|
81e985b4c3
|
afs: Remove setting of AS_RELEASE_ALWAYS for symlinks and mountpoints
Regular AFS files correctly use afs_file_aops which have release_folio
set as netfs_release_folio, so AS_RELEASE_ALWAYS is valid for them
when fscache is enabled (set via afs_vnode_set_cache()).
Symlinks and mountpoints in AFS use afs_dir_aops, which does not provide
a release_folio callback. However, afs_apply_status() unconditionally
calls mapping_set_release_always() for these.
In such case when memory management code attempts to release folios,
filemap_release_folio() checks folio_needs_release() which
returns true due to AS_RELEASE_ALWAYS being set. Since there is no
release_folio callback, it falls through to try_to_free_buffers(),
which at present expects buffer_heads to be not null. For symlinks
and mountpoints without buffer_heads, this causes pointer dereference.
[dh: Added more bits that were missed]
Fixes:
|
||
|
David Howells
|
733a984a4e
|
afs: Fix double netfs initialisation in afs_root_iget()
Fix afs_root_iget() to leave initialisation of the netfs_inode part of the
afs_vnode to afs_inode_init_from_status().
Fixes:
|
||
|
Matvey Kovalev
|
0b70716081
|
afs: fix NULL pointer dereference in afs_get_tree()
afs_alloc_sbi() uses kzalloc for memory allocation. And, if
ctx->dyn_root is not null, as->cell and as->volume are null.
In trace_afs_get_tree() they are dereferenced.
KASAN error message:
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 2 PID: 18478 Comm: syz-executor.7 Not tainted 5.10.246-syzkaller #0
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1
04/01/2014
RIP: 0010:perf_trace_afs_get_tree+0x1d9/0x550
include/trace/events/afs.h:1365
Call Trace:
trace_afs_get_tree include/trace/events/afs.h:1365 [inline]
afs_get_tree+0x922/0x1350 fs/afs/super.c:599
vfs_get_tree+0x8e/0x300 fs/super.c:1572
do_new_mount fs/namespace.c:3011 [inline]
path_mount+0x14a5/0x2220 fs/namespace.c:3341
do_mount fs/namespace.c:3354 [inline]
__do_sys_mount fs/namespace.c:3562 [inline]
__se_sys_mount fs/namespace.c:3539 [inline]
__x64_sys_mount+0x283/0x300 fs/namespace.c:3539
do_syscall_64+0x33/0x50 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x67/0xd1
Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Fixes:
|
||
|
Dan Carpenter
|
4897cb71d4
|
afs: Fix error code in afs_extract_vl_addrs()
The error codes on these paths are only set on the first iteration
through the loop. Set the correct error code on every iteration.
Fixes:
|
||
|
Nan Li
|
f3cf725cd2
|
afs: handle CB.InitCallBackState3 requests without a server record
The cache manager callback path now attaches the server record to an
incoming call through the rxrpc peer's app data. That association is
not guaranteed to exist for every callback request, and most callback
handlers already tolerate that case.
Make CB.InitCallBackState3 follow the same pattern by checking whether a
server record was attached before using it. If the peer is not mapped
to a server record, trace the request and ignore it, matching the
existing behaviour for other unmatched callback requests.
This keeps the callback handler consistent with the rest of the cache
manager service and avoids depending on peer state that may not be
available for a given request.
Fixes:
|
||
|
Jori Koolstra
|
b16f5529c6
|
afs: drop redundant S_IFDIR from mkdir
vfs_mkdir() now sets the S_IFDIR type bit in the mode it passes to ->mkdir(), so OR-ing S_IFDIR into the mode again in afs_mkdir() is redundant. Drop it. Assisted-by: LLM Signed-off-by: Jori Koolstra <jkoolstra@xs4all.nl> Link: https://patch.msgid.link/20260630105400.68459-5-jkoolstra@xs4all.nl Reviewed-by: NeilBrown <neil@brown.name> Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org> |
||
|
David Howells
|
a4057e58b0 |
afs: Fix uncancelled rxrpc OOB message handler
Fix AFS to cancel its OOB message processing (typically to respond to
security challenges). Also move OOB message processing to afs_wq so that
it's also waited for and make the OOB handler just return if the net
namespace is no longer live.
Fixes:
|
||
|
David Howells
|
2daf8ac812 |
afs: Fix further netns teardown to cancel the preallocation charger
When an afs network namespace is torn down, it cancels and waits for the
work item that keeps the preallocated rxrpc call/conn/peer queue charged
before disabling incoming (i.e. listen 0), but there's a small window in
which it can be requeued by an incoming call wending through the I/O
thread.
Fix this by cancelling the charger work item again after reducing the
listen backlog to zero.
Fixes:
|
||
|
Linus Torvalds
|
b85966adbf |
Networking changes for 7.2.
Core & protocols
----------------
- Work on removing rtnl_lock protection throughout the stack continues.
In this chapter:
- don't use rtnl_lock for IPv6 multicast routing configuration
- don't take rtnl_lock in ethtool for modern drivers
- prepare Qdisc dump callbacks for rtnl_lock removal
- Support dumping just ifindex + name of all interfaces, under RCU.
It's a common operation for Netlink CLI tools (when translating
names to ifindexes) and previously required full rtnl_lock.
- Support dumping qdiscs and page pools for a specific netdev. Even tho
user space wants a dump of all netdevs, most of the time, the OOO
programming model results in repeating the dump for each netdev.
Which, in absence of a cache, leads to a O(n^2) behavior.
- Flush nexthops once on multi-nexthop removal (e.g. when device goes
down), another O(n^2) -> O(n) improvement.
- Rehash locally generated traffic to a different nexthop on retransmit
timeout.
- Honor oif when choosing nexthop for locally generated IPv6 traffic.
- Convert TCP Auth Option to crypto library, and drop non-RFC algos.
- Increase subflow limits in MPTCP to 64 and endpoint limit to 256.
- Support MPTCP signaling of IPv6 address + port (ADD_ADDR). We need
to selectively skip reporting of the standard TCP Timestamp option,
because they won't fit into the header space together (12 + 30 > 40).
- Support using bridge neighbor suppression, Duplicate Address
Detection, Gratuitous ARP and unsolicited NA forwarding - in EVPN
deployments, e.g. VXLAN fabrics (IPv4 and IPv6).
- Improve link state reporting for upper netdevs (e.g. macvlan) over
tunnel devices (again, mostly for EVPN deployments).
- Support binding GENEVE tunnels to a local address.
- Speed up UDP tunnel destruction (remove one synchronize_rcu()).
- Support exponential field encoding in multicast (IGMPv3 and MLDv2).
- Support attaching PSP crypto offload to containers (veth, netkit).
- Add a new IPSec Netlink message XFRM_MSG_MIGRATE_STATE that allows
migrating individual IPsec SAs independently of their policies.
The existing XFRM_MSG_MIGRATE is tightly coupled to policy+SA
migration, lacks SPI for unique SA identification, and cannot express
reqid changes or migrate Transport mode selectors. The new interface
identifies the SA via SPI and mark, supports reqid changes, address
family changes, encap removal, and uses an atomic create+install
flow under x->lock to prevent SN/IV reuse during AEAD SA migration.
- Implement GRO/GSO support for PPPoE.
- Convert sockopt callbacks in a number of protocols to iov_iter.
Cross-tree stuff
----------------
- Remove support for Crypto TFM cloning (unblocked after the TCP Auth
Option rework). This feature regressed performance for all crypto API
users, since it changed crypto transformation objects into reference-
-counted objects.
- Add FCrypt-PCBC implementation to rxrpc and remove it from the global
crypto API as obsolete and insecure.
Wireless
--------
- Major rework of station bandwidth handling, fixing issues with lower
capability than AP.
- Cleanups for EMLSR spec issues (drafts differed).
- More Neighbor Awareness Networking (Wi-Fi Aware) work (multicast,
schedule improvements, multi-station etc.)
- Some Ultra High Reliability (UHR) / IEEE 802.11bn (D1.4) work
(e.g. non-primary channel access, UHR DBE support).
- Fine Timing Measurement ranging (i.e. distance measurement) APIs.
Netfilter
---------
- Use per-rule hash initval in nf_conncount. This avoids unnecessary
lock contention with short keys (e.g. conntrack zones) in different
namespaces.
- Various safety improvements, both in packet parsing and object
lifetimes. Notably add refcounts to conntrack timeout policy.
Deletions
---------
- Remove TLS + sockmap integration. TLS wants to pin user pages
to avoid a copy, and sockmap wants to write to the input stream.
More work on this integration is clearly needed, and we can't find
any users (original author admitted that they never deployed it).
- Remove support for TLS offload with TCP Offload Engine (the far
more common opportunistic offload is retained). The locking looks
unfixable (driver sleeps under TCP spin locks) and people from
the vendor that added this are AWOL.
- Remove more ATM code, trying to leave behind only what PPPoATM needs,
AAL5 and br2684 with permanent circuits.
- Remove AppleTalk. Let it join hamradio in our out of tree protocol
graveyard, I mean, repository.
- Disable 32-bit x_tables compatibility (32bit binaries on 64bit kernel)
interface in user namespaces. To be deleted completely, soon.
- Remove 5/10 MHz support from cfg80211/mac80211.
Drivers
-------
- Software:
- Support DEVMEM/DMABUF Tx over NETMEM_TX_NO_DMA devices (netkit).
- bonding: add knob to strictly follow 802.3ad for link state.
- New drivers:
- Alibaba Elastic Ethernet Adaptor (cloud vNIC).
- NXP NETC switch within i.MX94.
- DPLL:
- Add operational state to pins (implement in zl3073x).
- Add generic DPLL type, for daisy-chaining DPLLs (implement in ice).
- Ethernet high-speed NICs:
- Huawei (hinic3):
- enhance tc flow offload support with queue selection, tunnels
- nVidia/Mellanox:
- avoid over-copying payload to the skb's linear part (up to 60%
win for LRO on slow CPUs like ARM64 V2)
- expose more per-queue stats over the standard API
- support additional, unprivileged PFs in the DPU configuration
- support Socket Direct (multi-PF) with switchdev offloads
- add a pool / frag allocator for DMA mapped buffers for control
objects, save memory on systems with 64kB page size
- take advantage of the ability to dynamically change RSS table
size, even when table is configured by the user
- increase the max RSS table size for even traffic distribution
- Ethernet NICs:
- Marvell/Aquantia:
- AQC113 PTP support
- Realtek USB (r8152):
- support 10Gbit Link Speeds and Energy-Efficient Ethernet (EEE)
- support firmware loaded (for RTL8157/RTL8159)
- support for the RTL8159
- Intel (ixgbe):
- support Energy-Efficient Ethernet (EEE) on E610 devices
- Ethernet switches:
- Airoha:
- support multiple netdevs on a single GDM block / port
- Marvell (mv88e6xxx):
- support SERDES of mv88e6321
- Microchip (ksz8/9):
- rework the driver callbacks to remove one indirection layer
- Motorcomm (yt921x):
- support port rate policing
- support TBF qdisc offload
- support ACL/flower offload
- nVidia/Mellanox:
- expose per-PG rx_discards
- Realtek:
- rtl8365mb: bridge offloading and VLAN support
- Ethernet PHYs:
- Airoha:
- support Airoha AN8801R Gigabit PHYs.
- Micrel:
- implement 3 low-loss cable tunables
- Realtek:
- support MDI swapping for RTL8226-CG
- support MDIO for RTL931x
- Qualcomm:
- at803x: Rx and Tx clock management for IPQ5018 PHY
- Motorcomm:
- support YT8522 100M RMII PHY
- set drive strength in YT8531s RGMII
- TI:
- dp83822: add optional external PHY clock
- Bluetooth:
- hci_sync: add support for HCI_LE_Set_Host_Feature [v2]
- SMP: use AES-CMAC library API
- Intel:
- support Product level reset
- support smart trigger dump
- Mediatek:
- add event filter to filter specific event
- Realtek:
- fix RTL8761B/BU broken LE extended scan
- WiFi:
- Broadcom (b43):
- new support for a 11n device
- MediaTek (mt76):
- support mt7927
- mt792x: broken usb transport detection
- mt7921: regulatory improvements
- Qualcomm (ath9k):
- GPIO interface improvements
- Qualcomm (ath12k):
- WDS support
- replace dynamic memory allocation in WMI Rx path
- thermal throttling/cooling device support
- 6 GHz incumbent interference detection
- channel 177 in 5 GHz
- Realtek (rt89):
- RTL8922AU support
- USB 3 mode switch for performance
- better monitor radiotap support
- RTL8922DE preparations
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Merge tag 'net-next-7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
Pull networking updates from Jakub Kicinski:
"Core & protocols:
- Work on removing rtnl_lock protection throughout the stack
continues. In this chapter:
- don't use rtnl_lock for IPv6 multicast routing configuration
- don't take rtnl_lock in ethtool for modern drivers
- prepare Qdisc dump callbacks for rtnl_lock removal
- Support dumping just ifindex + name of all interfaces, under RCU.
It's a common operation for Netlink CLI tools (when translating
names to ifindexes) and previously required full rtnl_lock.
- Support dumping qdiscs and page pools for a specific netdev. Even
tho user space wants a dump of all netdevs, most of the time, the
OOO programming model results in repeating the dump for each
netdev. Which, in absence of a cache, leads to a O(n^2) behavior.
- Flush nexthops once on multi-nexthop removal (e.g. when device goes
down), another O(n^2) -> O(n) improvement.
- Rehash locally generated traffic to a different nexthop on
retransmit timeout.
- Honor oif when choosing nexthop for locally generated IPv6 traffic.
- Convert TCP Auth Option to crypto library, and drop non-RFC algos.
- Increase subflow limits in MPTCP to 64 and endpoint limit to 256.
- Support MPTCP signaling of IPv6 address + port (ADD_ADDR). We need
to selectively skip reporting of the standard TCP Timestamp option,
because they won't fit into the header space together (12 + 30 >
40).
- Support using bridge neighbor suppression, Duplicate Address
Detection, Gratuitous ARP and unsolicited NA forwarding - in EVPN
deployments, e.g. VXLAN fabrics (IPv4 and IPv6).
- Improve link state reporting for upper netdevs (e.g. macvlan) over
tunnel devices (again, mostly for EVPN deployments).
- Support binding GENEVE tunnels to a local address.
- Speed up UDP tunnel destruction (remove one synchronize_rcu()).
- Support exponential field encoding in multicast (IGMPv3 and MLDv2).
- Support attaching PSP crypto offload to containers (veth, netkit).
- Add a new IPSec Netlink message XFRM_MSG_MIGRATE_STATE that allows
migrating individual IPsec SAs independently of their policies.
The existing XFRM_MSG_MIGRATE is tightly coupled to policy+SA
migration, lacks SPI for unique SA identification, and cannot
express reqid changes or migrate Transport mode selectors.
The new interface identifies the SA via SPI and mark, supports
reqid changes, address family changes, encap removal, and uses an
atomic create+install flow under x->lock to prevent SN/IV reuse
during AEAD SA migration.
- Implement GRO/GSO support for PPPoE.
- Convert sockopt callbacks in a number of protocols to iov_iter.
Cross-tree stuff:
- Remove support for Crypto TFM cloning (unblocked after the TCP Auth
Option rework). This feature regressed performance for all crypto
API users, since it changed crypto transformation objects into
reference-counted objects.
- Add FCrypt-PCBC implementation to rxrpc and remove it from the
global crypto API as obsolete and insecure.
Wireless:
- Major rework of station bandwidth handling, fixing issues with
lower capability than AP.
- Cleanups for EMLSR spec issues (drafts differed).
- More Neighbor Awareness Networking (Wi-Fi Aware) work (multicast,
schedule improvements, multi-station etc.)
- Some Ultra High Reliability (UHR) / IEEE 802.11bn (D1.4) work
(e.g. non-primary channel access, UHR DBE support).
- Fine Timing Measurement ranging (i.e. distance measurement) APIs.
Netfilter:
- Use per-rule hash initval in nf_conncount. This avoids unnecessary
lock contention with short keys (e.g. conntrack zones) in different
namespaces.
- Various safety improvements, both in packet parsing and object
lifetimes. Notably add refcounts to conntrack timeout policy.
Deletions:
- Remove TLS + sockmap integration. TLS wants to pin user pages to
avoid a copy, and sockmap wants to write to the input stream. More
work on this integration is clearly needed, and we can't find any
users (original author admitted that they never deployed it).
- Remove support for TLS offload with TCP Offload Engine (the far
more common opportunistic offload is retained). The locking looks
unfixable (driver sleeps under TCP spin locks) and people from the
vendor that added this are AWOL.
- Remove more ATM code, trying to leave behind only what PPPoATM
needs, AAL5 and br2684 with permanent circuits.
- Remove AppleTalk. Let it join hamradio in our out of tree protocol
graveyard, I mean, repository.
- Disable 32-bit x_tables compatibility (32bit binaries on 64bit
kernel) interface in user namespaces. To be deleted completely,
soon.
- Remove 5/10 MHz support from cfg80211/mac80211.
Drivers:
- Software:
- Support DEVMEM/DMABUF Tx over NETMEM_TX_NO_DMA devices (netkit)
- bonding: add knob to strictly follow 802.3ad for link state
- New drivers:
- Alibaba Elastic Ethernet Adaptor (cloud vNIC).
- NXP NETC switch within i.MX94.
- DPLL:
- Add operational state to pins (implement in zl3073x).
- Add generic DPLL type, for daisy-chaining DPLLs (implement in ice).
- Ethernet high-speed NICs:
- Huawei (hinic3):
- enhance tc flow offload support with queue selection,
tunnels
- nVidia/Mellanox:
- avoid over-copying payload to the skb's linear part (up to
60% win for LRO on slow CPUs like ARM64 V2)
- expose more per-queue stats over the standard API
- support additional, unprivileged PFs in the DPU
configuration
- support Socket Direct (multi-PF) with switchdev offloads
- add a pool / frag allocator for DMA mapped buffers for
control objects, save memory on systems with 64kB page size
- take advantage of the ability to dynamically change RSS
table size, even when table is configured by the user
- increase the max RSS table size for even traffic
distribution
- Ethernet NICs:
- Marvell/Aquantia:
- AQC113 PTP support
- Realtek USB (r8152):
- support 10Gbit Link Speeds and Energy-Efficient Ethernet
(EEE)
- support firmware loaded (for RTL8157/RTL8159)
- support for the RTL8159
- Intel (ixgbe):
- support Energy-Efficient Ethernet (EEE) on E610 devices
- Ethernet switches:
- Airoha:
- support multiple netdevs on a single GDM block / port
- Marvell (mv88e6xxx):
- support SERDES of mv88e6321
- Microchip (ksz8/9):
- rework the driver callbacks to remove one indirection layer
- Motorcomm (yt921x):
- support port rate policing
- support TBF qdisc offload
- support ACL/flower offload
- nVidia/Mellanox:
- expose per-PG rx_discards
- Realtek:
- rtl8365mb: bridge offloading and VLAN support
- Ethernet PHYs:
- Airoha:
- support Airoha AN8801R Gigabit PHYs.
- Micrel:
- implement 3 low-loss cable tunables
- Realtek:
- support MDI swapping for RTL8226-CG
- support MDIO for RTL931x
- Qualcomm:
- at803x: Rx and Tx clock management for IPQ5018 PHY
- Motorcomm:
- support YT8522 100M RMII PHY
- set drive strength in YT8531s RGMII
- TI:
- dp83822: add optional external PHY clock
- Bluetooth:
- hci_sync: add support for HCI_LE_Set_Host_Feature [v2]
- SMP: use AES-CMAC library API
- Intel:
- support Product level reset
- support smart trigger dump
- Mediatek:
- add event filter to filter specific event
- Realtek:
- fix RTL8761B/BU broken LE extended scan
- WiFi:
- Broadcom (b43):
- new support for a 11n device
- MediaTek (mt76):
- support mt7927
- mt792x: broken usb transport detection
- mt7921: regulatory improvements
- Qualcomm (ath9k):
- GPIO interface improvements
- Qualcomm (ath12k):
- WDS support
- replace dynamic memory allocation in WMI Rx path
- thermal throttling/cooling device support
- 6 GHz incumbent interference detection
- channel 177 in 5 GHz
- Realtek (rt89):
- RTL8922AU support
- USB 3 mode switch for performance
- better monitor radiotap support
- RTL8922DE preparations"
* tag 'net-next-7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1778 commits)
ipv4: fib_rule: Move fib4_rules_exit() to ->exit().
net: serialize netif_running() check in enqueue_to_backlog()
net: skmsg: preserve sg.copy across SG transforms
appletalk: move the protocol out of tree
appletalk: stop storing per-interface state in struct net_device
selftests/bpf: test that TLS crypto is rejected on a sockmap socket
selftests/bpf: drop the unused kTLS program from test_sockmap
selftests/bpf: remove sockmap + ktls tests
tls: remove dead sockmap (psock) handling from the SW path
tls: reject the combination of TLS and sockmap
atm: remove orphaned uAPI for deleted drivers, protocols and SVCs
atm: remove unused ATM PHY operations
atm: remove the unused pre_send and send_bh device operations
atm: remove the unused change_qos device operation
atm: remove SVC socket support and the signaling daemon interface
atm: remove the local ATM (NSAP) address registry
atm: remove dead SONET PHY ioctls
atm: remove the unused send_oam / push_oam callbacks
atm: remove AAL3/4 transport support
net: dsa: sja1105: fix lastused timestamp in flower stats
...
|
||
|
David Howells
|
47694fbc9d |
afs: Fix netns teardown to cancel the preallocation charger
Fix the teardown of an afs network namespace to make sure it cancels the
work item that keeps the preallocated rxrpc call/conn/peer queue charged
before incoming calls are disabled (i.e. listen 0).
Also, if net->live is false because the afs netns is being deleted, make
afs_charge_preallocation() skip charging and make afs_rx_new_call() avoid
requeuing the charger.
(This was found by AI review).
Fixes:
|
||
|
NeilBrown
|
0e0e490f5d |
VFS: use wait_var_event for waiting in d_alloc_parallel()
Parallel lookup starts with a call of d_alloc_parallel(). That primitive
either returns a matching hashed dentry or allocates a new one in the
in-lookup state and returns it to the caller. Once the caller is done
with lookup, it indicates so either by call of d_{splice_alias,add}()
or by call of d_done_lookup(); at that point dentry leaves the in-lookup
state.
If d_alloc_parallel() finds a matching in-lookup dentry, it must wait for
that dentry to leave the in-lookup state, one way or another. Currently
by supplying wait_queue_head to d_alloc_parallel(). If d_alloc_parallel()
creates a new in-lookup dentry, the address of that wait_queue_head is stored
in ->d_wait of new dentry and stays there while it's in the in-lookup;
subsequent d_alloc_parallel() will wait on the queue found in the matching
in-lookup dentry. Transition out of in-lookup state wakes waiters on that
queue (if any).
That works, but the calling conventions are inconvenient - the caller must
supply wait_queue_head and make sure that it survives at least until the new
in-lookup dentry leaves the in-lookup state. That amounts to boilerplate
in the d_alloc_parallel() callers that are followed by a call of d_lookup_done()
in the same function; in cases like nfs asynchronous unlink it gets worse than
that.
This patch changes d_alloc_parallel() to use wake_up_var_locked() to
wake up waiters, and wait_var_event_spinlock() to wait. dentry->d_lock
is used for synchronisation as it is already held and the relevant
times.
That eliminates the need of caller-supplied wait_queue_head, simplifying
the calling conventions. Better yet, we only need one bit of information
stored in dentry itself: whether there are any waiters to be woken up,
and that can be easily stored in ->d_flags; ->d_wait goes away.
The reason we need that bit (DCACHE_LOOKUP_WAITERS) is that with wait_var
machinery the queues are shared with all kinds of stuff and there's
no way tell if any of the waiters have anything to do with our dentry;
most of the time none of them will be relevant, so we need to avoid the
pointless wakeups.
Another benefit of the new scheme comes from the fact that wakeups
have to be done outside of write-side critical areas of ->i_dir_seq;
with the old scheme we need to carry the value picked from ->d_wait from
__d_lookup_unhash() to the place where we actually wake the waiters up.
Now we can just leave DCACHE_LOOKUP_WAITERS in ->d_flags until we get
to doing wakeups - that's done within the same ->d_lock scope, so we
are fine; new bit is accessed only under ->d_lock and it's seen only
on dentries with DCACHE_PAR_LOOKUP in ->d_flags.
__d_lookup_unhash() no longer needs to re-init ->d_lru. That was
previously shared (in a union) with ->d_wait but ->d_wait is now gone
so it no longer corrupts ->d_lru.
Co-developed-by: Al Viro <viro@zeniv.linux.org.uk> # saner handling of flags
Signed-off-by: NeilBrown <neil@brown.name>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
||
|
David Howells
|
c0410adf3d
|
afs: Fix the locking used by afs_get_link()
The afs filesystem in the kernel doesn't do locking correctly for symbolic
links. There are a number of problems:
(1) It doesn't do any locking around afs_read_single() to prevent races
between multiple ->get_link() calls, thereby allowing the possibility
of leaks.
(2) It doesn't use RCU barriering when accessing the buffer pointers
during RCU pathwalk.
(3) It can race with another thread updating the contents of the symlink
if a third party updated it on the server.
Fix this by the following means:
(0) Move symlink handling into its own file as this makes it more
complicated.
(1) Take the validate_lock around afs_read_single() to prevent races
between multiple ->get_link() calls.
(2) Keep a separate copy of the symlink contents with an rcu_head. This
is always going to be a lot smaller than a page, so it can be
kmalloc'd and save quite a bit of memory. It also needs a refcount
for non-RCU pathwalk.
(3) Split the symlink read and write-to-cache routines in afs from those
for directories.
(4) Discard the I/O buffer as soon as the write-to-cache completes as this
is a full page (plus a folio_queue).
(5) If there's no cache, discard the I/O buffer immediately after reading
and copying if there is no cache.
Fixes:
|
||
|
David Howells
|
9871938f99
|
netfs, afs: Fix write skipping in dir/link writepages
Fix netfs_write_single() and afs_single_writepages() to better handle a
write that would be skipped due to lock contention and WB_SYNC_NONE by
returning 1 from netfs_write_single() if it skipped and making
afs_single_writepages() skip also. If a skip occurs, the inode must be
re-marked as the VFS may have cleared the mark.
This is really only theoretical for directories in netfs_write_single() as
the only path to that is through afs_single_writepages() that takes the
->validate_lock around it, thereby serialising it.
Fixes:
|
||
|
David Howells
|
2c8f4742bb
|
netfs: Fix potential for tearing in ->remote_i_size and ->zero_point
Fix potential tearing in using ->remote_i_size and ->zero_point by copying i_size_read() and i_size_write() and using the same seqcount as for i_size. We need to make sure that netfslib and the filesystems that use it always hold i_lock whilst updating any of the sizes to prevent i_size_seqcount from getting corrupted. Fixes: |
||
|
Linus Torvalds
|
334fbe734e |
mm.git review status for linus..mm-stable
Everything: Total patches: 368 Reviews/patch: 1.56 Reviewed rate: 74% Excluding DAMON: Total patches: 316 Reviews/patch: 1.77 Reviewed rate: 81% Excluding DAMON and zram: Total patches: 306 Reviews/patch: 1.81 Reviewed rate: 82% Excluding DAMON, zram and maple_tree: Total patches: 276 Reviews/patch: 2.01 Reviewed rate: 91% Significant patch series in this merge: - The 30 patch series "maple_tree: Replace big node with maple copy" from Liam Howlett is mainly prepararatory work for ongoing development but it does reduce stack usage and is an improvement. - The 12 patch series "mm, swap: swap table phase III: remove swap_map" from Kairui Song offers memory savings by removing the static swap_map. It also yields some CPU savings and implements several cleanups. - The 2 patch series "mm: memfd_luo: preserve file seals" from Pratyush Yadav adds file seal preservation to LUO's memfd code. - The 2 patch series "mm: zswap: add per-memcg stat for incompressible pages" from Jiayuan Chen adds additional userspace stats reportng to zswap. - The 4 patch series "arch, mm: consolidate empty_zero_page" from Mike Rapoport implements some cleanups for our handling of ZERO_PAGE() and zero_pfn. - The 2 patch series "mm/kmemleak: Improve scan_should_stop() implementation" from Zhongqiu Han provides an robustness improvement and some cleanups in the kmemleak code. - The 4 patch series "Improve khugepaged scan logic" from Vernon Yang "improves the khugepaged scan logic and reduces CPU consumption by prioritizing scanning tasks that access memory frequently". - The 2 patch series "Make KHO Stateless" from Jason Miu simplifies Kexec Handover by "transitioning KHO from an xarray-based metadata tracking system with serialization to a radix tree data structure that can be passed directly to the next kernel" - The 3 patch series "mm: vmscan: add PID and cgroup ID to vmscan tracepoints" from Thomas Ballasi and Steven Rostedt enhances vmscan's tracepointing. - The 5 patch series "mm: arch/shstk: Common shadow stack mapping helper and VM_NOHUGEPAGE" from Catalin Marinas is a cleanup for the shadow stack code: remove per-arch code in favour of a generic implementation. - The 2 patch series "Fix KASAN support for KHO restored vmalloc regions" from Pasha Tatashin fixes a WARN() which can be emitted the KHO restores a vmalloc area. - The 4 patch series "mm: Remove stray references to pagevec" from Tal Zussman provides several cleanups, mainly udpating references to "struct pagevec", which became folio_batch three years ago. - The 17 patch series "mm: Eliminate fake head pages from vmemmap optimization" from Kiryl Shutsemau simplifies the HugeTLB vmemmap optimization (HVO) by changing how tail pages encode their relationship to the head page. - The 2 patch series "mm/damon/core: improve DAMOS quota efficiency for core layer filters" from SeongJae Park improves two problematic behaviors of DAMOS that makes it less efficient when core layer filters are used. - The 3 patch series "mm/damon: strictly respect min_nr_regions" from SeongJae Park improves DAMON usability by extending the treatment of the min_nr_regions user-settable parameter. - The 3 patch series "mm/page_alloc: pcp locking cleanup" from Vlastimil Babka is a proper fix for a previously hotfixed SMP=n issue. Code simplifications and cleanups ennsed. - The 16 patch series "mm: cleanups around unmapping / zapping" from David Hildenbrand implements "a bunch of cleanups around unmapping and zapping. Mostly simplifications, code movements, documentation and renaming of zapping functions". - The 6 patch series "support batched checking of the young flag for MGLRU" from Baolin Wang supports batched checking of the young flag for MGLRU. It's part cleanups; one benchmark shows large performance benefits for arm64. - The 5 patch series "memcg: obj stock and slab stat caching cleanups" from Johannes Weiner provides memcg cleanup and robustness improvements. - The 5 patch series "Allow order zero pages in page reporting" from Yuvraj Sakshith enhances page_reporting's free page reporting - it is presently and undesirably order-0 pages when reporting free memory. - The 6 patch series "mm: vma flag tweaks" from Lorenzo Stoakes is cleanup work following from the recent conversion of the VMA flags to a bitmap. - The 10 patch series "mm/damon: add optional debugging-purpose sanity checks" from SeongJae Park adds some more developer-facing debug checks into DAMON core. - The 2 patch series "mm/damon: test and document power-of-2 min_region_sz requirement" from SeongJae Park adds an additional DAMON kunit test and makes some adjustments to the addr_unit parameter handling. - The 3 patch series "mm/damon/core: make passed_sample_intervals comparisons overflow-safe" from SeongJae Park fixes a hard-to-hit time overflow issue in DAMON core. - The 7 patch series "mm/damon: improve/fixup/update ratio calculation, test and documentation" from SeongJae Park is a "batch of misc/minor improvements and fixups" for DAMON. - The 4 patch series "mm: move vma_(kernel|mmu)_pagesize() out of hugetlb.c" from David Hildenbrand fixes a possible issue with dax-device when CONFIG_HUGETLB=n. Some code movement was required. - The 6 patch series "zram: recompression cleanups and tweaks" from Sergey Senozhatsky provides "a somewhat random mix of fixups, recompression cleanups and improvements" in the zram code. - The 11 patch series "mm/damon: support multiple goal-based quota tuning algorithms" from SeongJae Park extend DAMOS quotas goal auto-tuning to support multiple tuning algorithms that users can select. - The 4 patch series "mm: thp: reduce unnecessary start_stop_khugepaged()" from Breno Leitao fixes the khugpaged sysfs handling so we no longer spam the logs with reams of junk when starting/stopping khugepaged. - The 3 patch series "mm: improve map count checks" from Lorenzo Stoakes provides some cleanups and slight fixes in the mremap, mmap and vma code. - The 5 patch series "mm/damon: support addr_unit on default monitoring targets for modules" from SeongJae Park extends the use of DAMON core's addr_unit tunable. - The 5 patch series "mm: khugepaged cleanups and mTHP prerequisites" from Nico Pache provides cleanups in the khugepaged and is a base for Nico's planned khugepaged mTHP support. - The 15 patch series "mm: memory hot(un)plug and SPARSEMEM cleanups" from David Hildenbrand implements code movement and cleanups in the memhotplug and sparsemem code. - The 2 patch series "mm: remove CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE and cleanup CONFIG_MIGRATION" from David Hildenbrand rationalizes some memhotplug Kconfig support. - The 6 patch series "change young flag check functions to return bool" from Baolin Wang is "a cleanup patchset to change all young flag check functions to return bool". - The 3 patch series "mm/damon/sysfs: fix memory leak and NULL dereference issues" from Josh Law and SeongJae Park fixes a few potential DAMON bugs. - The 25 patch series "mm/vma: convert vm_flags_t to vma_flags_t in vma code" from "converts a lot of the existing use of the legacy vm_flags_t data type to the new vma_flags_t type which replaces it". Mainly in the vma code. - The 21 patch series "mm: expand mmap_prepare functionality and usage" from Lorenzo Stoakes "expands the mmap_prepare functionality, which is intended to replace the deprecated f_op->mmap hook which has been the source of bugs and security issues for some time". Cleanups, documentation, extension of mmap_prepare into filesystem drivers. - The 13 patch series "mm/huge_memory: refactor zap_huge_pmd()" from Lorenzo Stoakes simplifies and cleans up zap_huge_pmd(). Additional cleanups around vm_normal_folio_pmd() and the softleaf functionality are performed. -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQTTMBEPP41GrTpTJgfdBJ7gKXxAjgUCad3HDQAKCRDdBJ7gKXxA jrUQAPwNhPk5nPSxnyxjAeQtOBHqgCdnICeEismLajPKd9aYRgEA0s2XAu3tSUYi GrBnWImHG3s4ePQxVcPCegWTsOUrXgQ= =1Q7o -----END PGP SIGNATURE----- Merge tag 'mm-stable-2026-04-13-21-45' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Pull MM updates from Andrew Morton: - "maple_tree: Replace big node with maple copy" (Liam Howlett) Mainly prepararatory work for ongoing development but it does reduce stack usage and is an improvement. - "mm, swap: swap table phase III: remove swap_map" (Kairui Song) Offers memory savings by removing the static swap_map. It also yields some CPU savings and implements several cleanups. - "mm: memfd_luo: preserve file seals" (Pratyush Yadav) File seal preservation to LUO's memfd code - "mm: zswap: add per-memcg stat for incompressible pages" (Jiayuan Chen) Additional userspace stats reportng to zswap - "arch, mm: consolidate empty_zero_page" (Mike Rapoport) Some cleanups for our handling of ZERO_PAGE() and zero_pfn - "mm/kmemleak: Improve scan_should_stop() implementation" (Zhongqiu Han) A robustness improvement and some cleanups in the kmemleak code - "Improve khugepaged scan logic" (Vernon Yang) Improve khugepaged scan logic and reduce CPU consumption by prioritizing scanning tasks that access memory frequently - "Make KHO Stateless" (Jason Miu) Simplify Kexec Handover by transitioning KHO from an xarray-based metadata tracking system with serialization to a radix tree data structure that can be passed directly to the next kernel - "mm: vmscan: add PID and cgroup ID to vmscan tracepoints" (Thomas Ballasi and Steven Rostedt) Enhance vmscan's tracepointing - "mm: arch/shstk: Common shadow stack mapping helper and VM_NOHUGEPAGE" (Catalin Marinas) Cleanup for the shadow stack code: remove per-arch code in favour of a generic implementation - "Fix KASAN support for KHO restored vmalloc regions" (Pasha Tatashin) Fix a WARN() which can be emitted the KHO restores a vmalloc area - "mm: Remove stray references to pagevec" (Tal Zussman) Several cleanups, mainly udpating references to "struct pagevec", which became folio_batch three years ago - "mm: Eliminate fake head pages from vmemmap optimization" (Kiryl Shutsemau) Simplify the HugeTLB vmemmap optimization (HVO) by changing how tail pages encode their relationship to the head page - "mm/damon/core: improve DAMOS quota efficiency for core layer filters" (SeongJae Park) Improve two problematic behaviors of DAMOS that makes it less efficient when core layer filters are used - "mm/damon: strictly respect min_nr_regions" (SeongJae Park) Improve DAMON usability by extending the treatment of the min_nr_regions user-settable parameter - "mm/page_alloc: pcp locking cleanup" (Vlastimil Babka) The proper fix for a previously hotfixed SMP=n issue. Code simplifications and cleanups ensued - "mm: cleanups around unmapping / zapping" (David Hildenbrand) A bunch of cleanups around unmapping and zapping. Mostly simplifications, code movements, documentation and renaming of zapping functions - "support batched checking of the young flag for MGLRU" (Baolin Wang) Batched checking of the young flag for MGLRU. It's part cleanups; one benchmark shows large performance benefits for arm64 - "memcg: obj stock and slab stat caching cleanups" (Johannes Weiner) memcg cleanup and robustness improvements - "Allow order zero pages in page reporting" (Yuvraj Sakshith) Enhance free page reporting - it is presently and undesirably order-0 pages when reporting free memory. - "mm: vma flag tweaks" (Lorenzo Stoakes) Cleanup work following from the recent conversion of the VMA flags to a bitmap - "mm/damon: add optional debugging-purpose sanity checks" (SeongJae Park) Add some more developer-facing debug checks into DAMON core - "mm/damon: test and document power-of-2 min_region_sz requirement" (SeongJae Park) An additional DAMON kunit test and makes some adjustments to the addr_unit parameter handling - "mm/damon/core: make passed_sample_intervals comparisons overflow-safe" (SeongJae Park) Fix a hard-to-hit time overflow issue in DAMON core - "mm/damon: improve/fixup/update ratio calculation, test and documentation" (SeongJae Park) A batch of misc/minor improvements and fixups for DAMON - "mm: move vma_(kernel|mmu)_pagesize() out of hugetlb.c" (David Hildenbrand) Fix a possible issue with dax-device when CONFIG_HUGETLB=n. Some code movement was required. - "zram: recompression cleanups and tweaks" (Sergey Senozhatsky) A somewhat random mix of fixups, recompression cleanups and improvements in the zram code - "mm/damon: support multiple goal-based quota tuning algorithms" (SeongJae Park) Extend DAMOS quotas goal auto-tuning to support multiple tuning algorithms that users can select - "mm: thp: reduce unnecessary start_stop_khugepaged()" (Breno Leitao) Fix the khugpaged sysfs handling so we no longer spam the logs with reams of junk when starting/stopping khugepaged - "mm: improve map count checks" (Lorenzo Stoakes) Provide some cleanups and slight fixes in the mremap, mmap and vma code - "mm/damon: support addr_unit on default monitoring targets for modules" (SeongJae Park) Extend the use of DAMON core's addr_unit tunable - "mm: khugepaged cleanups and mTHP prerequisites" (Nico Pache) Cleanups to khugepaged and is a base for Nico's planned khugepaged mTHP support - "mm: memory hot(un)plug and SPARSEMEM cleanups" (David Hildenbrand) Code movement and cleanups in the memhotplug and sparsemem code - "mm: remove CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE and cleanup CONFIG_MIGRATION" (David Hildenbrand) Rationalize some memhotplug Kconfig support - "change young flag check functions to return bool" (Baolin Wang) Cleanups to change all young flag check functions to return bool - "mm/damon/sysfs: fix memory leak and NULL dereference issues" (Josh Law and SeongJae Park) Fix a few potential DAMON bugs - "mm/vma: convert vm_flags_t to vma_flags_t in vma code" (Lorenzo Stoakes) Convert a lot of the existing use of the legacy vm_flags_t data type to the new vma_flags_t type which replaces it. Mainly in the vma code. - "mm: expand mmap_prepare functionality and usage" (Lorenzo Stoakes) Expand the mmap_prepare functionality, which is intended to replace the deprecated f_op->mmap hook which has been the source of bugs and security issues for some time. Cleanups, documentation, extension of mmap_prepare into filesystem drivers - "mm/huge_memory: refactor zap_huge_pmd()" (Lorenzo Stoakes) Simplify and clean up zap_huge_pmd(). Additional cleanups around vm_normal_folio_pmd() and the softleaf functionality are performed. * tag 'mm-stable-2026-04-13-21-45' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (369 commits) mm: fix deferred split queue races during migration mm/khugepaged: fix issue with tracking lock mm/huge_memory: add and use has_deposited_pgtable() mm/huge_memory: add and use normal_or_softleaf_folio_pmd() mm: add softleaf_is_valid_pmd_entry(), pmd_to_softleaf_folio() mm/huge_memory: separate out the folio part of zap_huge_pmd() mm/huge_memory: use mm instead of tlb->mm mm/huge_memory: remove unnecessary sanity checks mm/huge_memory: deduplicate zap deposited table call mm/huge_memory: remove unnecessary VM_BUG_ON_PAGE() mm/huge_memory: add a common exit path to zap_huge_pmd() mm/huge_memory: handle buggy PMD entry in zap_huge_pmd() mm/huge_memory: have zap_huge_pmd return a boolean, add kdoc mm/huge: avoid big else branch in zap_huge_pmd() mm/huge_memory: simplify vma_is_specal_huge() mm: on remap assert that input range within the proposed VMA mm: add mmap_action_map_kernel_pages[_full]() uio: replace deprecated mmap hook with mmap_prepare in uio_info drivers: hv: vmbus: replace deprecated mmap hook with mmap_prepare mm: allow handling of stacked mmap_prepare hooks in more drivers ... |
||
|
Linus Torvalds
|
b7d74ea0fd |
vfs-7.1-rc1.kino
Please consider pulling these changes from the signed vfs-7.1-rc1.kino tag. Thanks! Christian -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQRAhzRXHqcMeLMyaSiRxhvAZXjcogUCadjZCgAKCRCRxhvAZXjc otmnAP4sbsxZQdz2TG2hJuOwnEZOkkxZQOUMc3ERVyZaWXIeTAEA7e5M+8FpoG9n 8ipO76UoaXdGLESrqVdp9EOhLqOW7QY= =uMeJ -----END PGP SIGNATURE----- Merge tag 'vfs-7.1-rc1.kino' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs Pull vfs i_ino updates from Christian Brauner: "For historical reasons, the inode->i_ino field is an unsigned long, which means that it's 32 bits on 32 bit architectures. This has caused a number of filesystems to implement hacks to hash a 64-bit identifier into a 32-bit field, and deprives us of a universal identifier field for an inode. This changes the inode->i_ino field from an unsigned long to a u64. This shouldn't make any material difference on 64-bit hosts, but 32-bit hosts will see struct inode grow by at least 4 bytes. This could have effects on slabcache sizes and field alignment. The bulk of the changes are to format strings and tracepoints, since the kernel itself doesn't care that much about the i_ino field. The first patch changes some vfs function arguments, so check that one out carefully. With this change, we may be able to shrink some inode structures. For instance, struct nfs_inode has a fileid field that holds the 64-bit inode number. With this set of changes, that field could be eliminated. I'd rather leave that sort of cleanups for later just to keep this simple" * tag 'vfs-7.1-rc1.kino' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: nilfs2: fix 64-bit division operations in nilfs_bmap_find_target_in_group() EVM: add comment describing why ino field is still unsigned long vfs: remove externs from fs.h on functions modified by i_ino widening treewide: fix missed i_ino format specifier conversions ext4: fix signed format specifier in ext4_load_inode trace event treewide: change inode->i_ino from unsigned long to u64 nilfs2: widen trace event i_ino fields to u64 f2fs: widen trace event i_ino fields to u64 ext4: widen trace event i_ino fields to u64 zonefs: widen trace event i_ino fields to u64 hugetlbfs: widen trace event i_ino fields to u64 ext2: widen trace event i_ino fields to u64 cachefiles: widen trace event i_ino fields to u64 vfs: widen trace event i_ino fields to u64 net: change sock.sk_ino and sock_i_ino() to u64 audit: widen ino fields to u64 vfs: widen inode hash/lookup functions to u64 |
||
|
Lorenzo Stoakes (Oracle)
|
4995c67d4e |
fs: afs: restore mmap_prepare implementation
Commit
|
||
|
Lorenzo Stoakes (Oracle)
|
fbfc6578ea |
fs: afs: revert mmap_prepare() change
Partially reverts commit |
||
|
Tal Zussman
|
ab5193e919 |
fs: remove unncessary pagevec.h includes
Remove unused pagevec.h includes from .c files. These were found with the following command: grep -rl '#include.*pagevec\.h' --include='*.c' | while read f; do grep -qE 'PAGEVEC_SIZE|folio_batch' "$f" || echo "$f" done There are probably more removal candidates in .h files, but those are more complex to analyze. Link: https://lkml.kernel.org/r/20260225-pagevec_cleanup-v2-2-716868cc2d11@columbia.edu Signed-off-by: Tal Zussman <tz2294@columbia.edu> Reviewed-by: Jan Kara <jack@suse.cz> Acked-by: Zi Yan <ziy@nvidia.com> Acked-by: Chris Li <chrisl@kernel.org> Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org> Cc: Christian Brauner <brauner@kernel.org> Cc: David Hildenbrand (Arm) <david@kernel.org> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Tal Zussman
|
cbf56f9981 |
mm: remove stray references to struct pagevec
Patch series "mm: Remove stray references to pagevec", v2. struct pagevec was removed in commit |