Pull ceph fixes from Ilya Dryomov:
 "A fix for a possible use-after-free following "rbd unmap" or "umount"
  marked for stable and two kernel-doc fixups"

* tag 'ceph-for-6.10-rc8' of https://github.com/ceph/ceph-client:
  libceph: fix crush_choose_firstn() kernel-doc warnings
  libceph: suppress crush_choose_indep() kernel-doc warnings
  libceph: fix race between delayed_work() and ceph_monc_stop()

Pull pmdomain fix from Ulf Hansson:

 - qcom: Skip retention level for rpmhpd's

* tag 'pmdomain-v6.10-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/linux-pm:
  pmdomain: qcom: rpmhpd: Skip retention level for Power Domains

Pull MMC host fixes from Ulf Hansson:

 - davinci_mmc: Prevent transmitted data size from exceeding sgm's
   length

 - sdhci: Fix max_seg_size for 64KiB PAGE_SIZE

* tag 'mmc-v6.10-rc4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc:
  mmc: davinci_mmc: Prevent transmitted data size from exceeding sgm's length
  mmc: sdhci: Fix max_seg_size for 64KiB PAGE_SIZE

Pull ARM SoC fixes from Arnd Bergmann:
 "Most of these changes are Qualcomm SoC specific and came in just after
  I sent out the last set of fixes. This includes two regression fixes
  for SoC drivers, a defconfig change to ensure the Lenovo X13s is
  usable and 11 changes to DT files to fix regressions and minor
  platform specific issues.

  Tony and Chunyan step back from their respective maintainership roles
  on the omap and unisoc platforms, and Christophe in turn takes over
  maintaining some of the Freescale SoC drivers that he has been taking
  care of in practice already.

  Lastly, there are two trivial fixes for the davinci and sunxi
  platforms"

* tag 'arm-fixes-6.10-3' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc:
  MAINTAINERS: Update FREESCALE SOC DRIVERS and QUICC ENGINE LIBRARY
  MAINTAINERS: Add more maintainers for omaps
  ARM: davinci: Convert comma to semicolon
  MAINTAINERS: Move myself from SPRD Maintainer to Reviewer
  Revert "dt-bindings: cache: qcom,llcc: correct QDU1000 reg entries"
  arm64: dts: qcom: qdu1000: Fix LLCC reg property
  arm64: dts: qcom: sm6115: add iommu for sdhc_1
  arm64: dts: qcom: x1e80100-crd: fix DAI used for headset recording
  arm64: dts: qcom: x1e80100-crd: fix WCD audio codec TX port mapping
  soc: qcom: pmic_glink: disable UCSI on sc8280xp
  arm64: defconfig: enable Elan i2c-hid driver
  arm64: dts: qcom: sc8280xp-crd: use external pull up for touch reset
  arm64: dts: qcom: sc8280xp-x13s: fix touchscreen power on
  arm64: dts: qcom: x1e80100: Fix PCIe 6a reg offsets and add MHI
  arm64: dts: qcom: sa8775p: Correct IRQ number of EL2 non-secure physical timer
  arm64: dts: allwinner: Fix PMIC interrupt number
  arm64: dts: qcom: sc8280xp: Set status = "reserved" on PSHOLD
  arm64: dts: qcom: x1e80100-*: Allocate some CMA buffers
  arm64: dts: qcom: sc8180x: Fix LLCC reg property again

Pull char / misc driver fixes from Greg KH:
 "Here are some small remaining driver fixes for 6.10-final that have
  all been in linux-next for a while and resolve reported issues.
  Included in here are:

   - mei driver fixes (and a spelling fix at the end just to be clean)

   - iio driver fixes for reported problems

   - fastrpc bugfixes

   - nvmem small fixes"

* tag 'char-misc-6.10-final' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  mei: vsc: Fix spelling error
  mei: vsc: Enhance SPI transfer of IVSC ROM
  mei: vsc: Utilize the appropriate byte order swap function
  mei: vsc: Prevent timeout error with added delay post-firmware download
  mei: vsc: Enhance IVSC chipset stability during warm reboot
  nvmem: core: limit cell sysfs permissions to main attribute ones
  nvmem: core: only change name to fram for current attribute
  nvmem: meson-efuse: Fix return value of nvmem callbacks
  nvmem: rmem: Fix return value of rmem_read()
  misc: microchip: pci1xxxx: Fix return value of nvmem callbacks
  hpet: Support 32-bit userspace
  misc: fastrpc: Restrict untrusted app to attach to privileged PD
  misc: fastrpc: Fix ownership reassignment of remote heap
  misc: fastrpc: Fix memory leak in audio daemon attach operation
  misc: fastrpc: Avoid updating PD type for capability request
  misc: fastrpc: Copy the complete capability structure to user
  misc: fastrpc: Fix DSP capabilities request
  iio: light: apds9306: Fix error handing
  iio: trigger: Fix condition for own trigger

Pull tty / serial fixes from Greg KH:
 "Here are some small serial driver fixes for 6.10-final. Included in
  here are:

   - qcom-geni fixes for a much much much discussed issue and everyone
     now seems to be agreed that this is the proper way forward to
     resolve the reported lockups

   - imx serial driver bugfixes

   - 8250_omap errata fix

   - ma35d1 serial driver bugfix

  All of these have been in linux-next for over a week with no reported
  issues"

* tag 'tty-6.10-final' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  serial: qcom-geni: do not kill the machine on fifo underrun
  serial: qcom-geni: fix hard lockup on buffer flush
  serial: qcom-geni: fix soft lockup on sw flow control and suspend
  serial: imx: ensure RTS signal is not left active after shutdown
  tty: serial: ma35d1: Add a NULL check for of_node
  serial: 8250_omap: Fix Errata i2310 with RX FIFO level check
  serial: imx: only set receiver level if it is zero

Pull USB fixes from Greg KH:
 "Here are some small USB driver fixes and new device ids for
  6.10-final. Included in here are:

   - new usb-serial device ids for reported devices

   - syzbot-triggered duplicate endpoint bugfix

   - gadget bugfix for configfs memory overwrite

   - xhci resume bugfix

   - new device quirk added

   - usb core error path bugfix

  All of these have been in linux-next (most for a while) with no
  reported issues"

* tag 'usb-6.10-final' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
  USB: serial: mos7840: fix crash on resume
  USB: serial: option: add Rolling RW350-GL variants
  USB: serial: option: add support for Foxconn T99W651
  USB: serial: option: add Netprisma LCUK54 series modules
  usb: gadget: configfs: Prevent OOB read/write in usb_string_copy()
  usb: dwc3: pci: add support for the Intel Panther Lake
  usb: core: add missing of_node_put() in usb_of_has_devices_or_graph
  USB: Add USB_QUIRK_NO_SET_INTF quirk for START BP-850k
  USB: core: Fix duplicate endpoint bug by clearing reserved bits in the descriptor
  xhci: always resume roothubs if xHC was reset during resume
  USB: serial: option: add Telit generic core-dump composition
  USB: serial: option: add Fibocom FM350-GL
  USB: serial: option: add Telit FN912 rmnet compositions

Pull sound fixes from Takashi Iwai:
 "The majority of changes here are small device-specific fixes for ASoC
  SOF / Intel and usual HD-audio quirks.

  The only significant high LOC is found in the Cirrus firmware driver,
  but all those are for hardening against malicious firmware blobs, and
  they look fine for taking as a last minute fix, too"

* tag 'sound-6.10' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: hda/realtek: Enable Mute LED on HP 250 G7
  firmware: cs_dsp: Use strnlen() on name fields in V1 wmfw files
  ALSA: hda/realtek: Limit mic boost on VAIO PRO PX
  ALSA: hda: cs35l41: Fix swapped l/r audio channels for Lenovo ThinBook 13x Gen4
  ASoC: SOF: Intel: hda-pcm: Limit the maximum number of periods by MAX_BDL_ENTRIES
  ASoC: rt711-sdw: add missing readable registers
  ASoC: SOF: Intel: hda: fix null deref on system suspend entry
  ALSA: hda/realtek: add quirk for Clevo V5[46]0TU
  firmware: cs_dsp: Prevent buffer overrun when processing V2 alg headers
  firmware: cs_dsp: Validate payload length before processing block
  firmware: cs_dsp: Return error if block header overflows file
  firmware: cs_dsp: Fix overflow checking of wmfw header

Pull more bcachefs fixes from Kent Overstreet:

 - revert the SLAB_ACCOUNT patch, something crazy is going on in memcg
   and someone forgot to test

 - minor fixes: missing rcu_read_lock(), scheduling while atomic (in an
   emergency shutdown path)

 - two lockdep fixes; these could have gone earlier, but were left to
   bake awhile

* tag 'bcachefs-2024-07-12' of https://evilpiepirate.org/git/bcachefs:
  bcachefs: bch2_gc_btree() should not use btree_root_lock
  bcachefs: Set PF_MEMALLOC_NOFS when trans->locked
  bcachefs; Use trans_unlock_long() when waiting on allocator
  Revert "bcachefs: Mark bch_inode_info as SLAB_ACCOUNT"
  bcachefs: fix scheduling while atomic in break_cycle()
  bcachefs: Fix RCU splat

FREESCALE SOC DRIVERS has been orphaned since
commit eaac25d0 ("MAINTAINERS: Drop Li Yang as their email address
stopped working")
QUICC ENGINE LIBRARY has Qiang Zhao as maintainer but he hasn't
responded for years and when Li Yang was still maintaining FREESCALE
SOC DRIVERS he was also handling QUICC ENGINE LIBRARY directly.

As a maintainer of LINUX FOR POWERPC EMBEDDED PPC8XX AND PPC83XX, I
also need FREESCALE SOC DRIVERS to be actively maintained, so add
myself as maintainer of FREESCALE SOC DRIVERS and QUICC ENGINE LIBRARY.

See below link for more context.

Link: https://lore.kernel.org/linuxppc-dev/20240219153016.ntltc76bphwrv6hn@skbuf/T/#mf6d4a5eef79e8eae7ae0456a2794c01e630a6756Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

There are many generations of omaps to maintain, and I will be only active
as a hobbyist with time permitting. Let's add more maintainers to ensure
continued Linux support.

TI is interested in maintaining the active SoCs such as am3, am4 and
dra7. And the hobbyists are interested in maintaining some of the older
devices, mainly based on omap3 and 4 SoCs.

Kevin and Roger have agreed to maintain the active TI parts. Both Kevin
and Roger have been working on the omap variants for a long time, and
have a good understanding of the hardware.

Aaro and Andreas have agreed to maintain the community devices. Both Aaro
and Andreas have long experience on working with the earlier TI SoCs.

While at it, let's also change me to be a reviewer for the omap1, and
drop the link to my old omap web page.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
Acked-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Acked-by: Roger Quadros <rogerq@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

btree_root_lock is for the root keys in btree_root, not the pointers to
the nodes themselves; this fixes a lock ordering issue between
btree_root_lock and btree node locks.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

proper lock ordering is: fs_reclaim -> btree node locks
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

not using unlock_long() blocks key cache reclaim, and the allocator may
take awhile
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

This reverts commit 86d81ec5.

This wasn't tested with memcg enabled, it immediately hits a null ptr
deref in list_lru_add().
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Merge tag 'for-6.10/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fix from Mikulas Patocka:

 - Fix broken discard for device mapper VDO target

* tag 'for-6.10/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm vdo: replace max_discard_sectors with max_hw_discard_sectors

Commit 4f563a64 ("block: add a max_user_discard_sectors queue
limit") changed block core to set max_discard_sectors to:
min(lim->max_hw_discard_sectors, lim->max_user_discard_sectors)

Commit 825d8bbd ("dm: always manage discard support in terms
of max_hw_discard_sectors") fixed most dm targetss to deal with
this, by replacing max_discard_sectors with max_hw_discard_sectors.
Unfortunately, dm-vdo did not get fixed at that time.

Fixes: 825d8bbd ("dm: always manage discard support in terms of max_hw_discard_sectors")
Signed-off-by: Bruce Johnston <bjohnsto@redhat.com>
Signed-off-by: Matthew Sakai <msakai@redhat.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

Pull spi fixes from Mark Brown:
 "This fixes two regressions that have been bubbling along for a large
  part of this release.

  One is a revert of the multi mode support for the OMAP SPI controller,
  this introduced regressions on a number of systems and while there has
  been progress on fixing those we've not got something that works for
  everyone yet so let's just drop the change for now.

  The other is a series of fixes from David Lechner for his recent
  message optimisation work, this interacted badly with spi-mux which
  is altogether too clever with recursive use of the bus and creates
  situations that hadn't been considered.

  There are also a couple of small driver specific fixes, including one
  more patch from David for sleep duration calculations in the AXI
  driver"

* tag 'spi-fix-v6.10-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
  spi: mux: set ctlr->bits_per_word_mask
  spi: add defer_optimize_message controller flag
  spi: don't unoptimize message in spi_async()
  spi: omap2-mcspi: Revert multi mode support
  spi: davinci: Unset POWERDOWN bit when releasing resources
  spi: axi-spi-engine: fix sleep calculation
  spi: imx: Don't expect DMA for i.MX{25,35,50,51,53} cspi devices

Pull networking fixes from Paolo Abeni:
 "Including fixes from bpf and netfilter.

  Current release - regressions:

   - core: fix rc7's __skb_datagram_iter() regression

  Current release - new code bugs:

   - eth: bnxt: fix crashes when reducing ring count with active RSS
     contexts

  Previous releases - regressions:

   - sched: fix UAF when resolving a clash

   - skmsg: skip zero length skb in sk_msg_recvmsg2

   - sunrpc: fix kernel free on connection failure in
     xs_tcp_setup_socket

   - tcp: avoid too many retransmit packets

   - tcp: fix incorrect undo caused by DSACK of TLP retransmit

   - udp: Set SOCK_RCU_FREE earlier in udp_lib_get_port().

   - eth: ks8851: fix deadlock with the SPI chip variant

   - eth: i40e: fix XDP program unloading while removing the driver

  Previous releases - always broken:

   - bpf:
       - fix too early release of tcx_entry
       - fail bpf_timer_cancel when callback is being cancelled
       - bpf: fix order of args in call to bpf_map_kvcalloc

   - netfilter: nf_tables: prefer nft_chain_validate

   - ppp: reject claimed-as-LCP but actually malformed packets

   - wireguard: avoid unaligned 64-bit memory accesses"

* tag 'net-6.10-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (33 commits)
  net, sunrpc: Remap EPERM in case of connection failure in xs_tcp_setup_socket
  net/sched: Fix UAF when resolving a clash
  net: ks8851: Fix potential TX stall after interface reopen
  udp: Set SOCK_RCU_FREE earlier in udp_lib_get_port().
  netfilter: nf_tables: prefer nft_chain_validate
  netfilter: nfnetlink_queue: drop bogus WARN_ON
  ethtool: netlink: do not return SQI value if link is down
  ppp: reject claimed-as-LCP but actually malformed packets
  selftests/bpf: Add timer lockup selftest
  net: ethernet: mtk-star-emac: set mac_managed_pm when probing
  e1000e: fix force smbus during suspend flow
  tcp: avoid too many retransmit packets
  bpf: Defer work in bpf_timer_cancel_and_free
  bpf: Fail bpf_timer_cancel when callback is being cancelled
  bpf: fix order of args in call to bpf_map_kvcalloc
  net: ethernet: lantiq_etop: fix double free in detach
  i40e: Fix XDP program unloading while removing the driver
  net: fix rc7's __skb_datagram_iter()
  net: ks8851: Fix deadlock with the SPI chip variant
  octeontx2-af: Fix incorrect value output on error path in rvu_check_rsrc_availability()
  ...

Pull vfs fixes from Christian Brauner:
 "cachefiles:

   - Export an existing and add a new cachefile helper to be used in
     filesystems to fix reference count bugs

   - Use the newly added fscache_ty_get_volume() helper to get a
     reference count on an fscache_volume to handle volumes that are
     about to be removed cleanly

   - After withdrawing a fscache_cache via FSCACHE_CACHE_IS_WITHDRAWN
     wait for all ongoing cookie lookups to complete and for the object
     count to reach zero

   - Propagate errors from vfs_getxattr() to avoid an infinite loop in
     cachefiles_check_volume_xattr() because it keeps seeing ESTALE

   - Don't send new requests when an object is dropped by raising
     CACHEFILES_ONDEMAND_OJBSTATE_DROPPING

   - Cancel all requests for an object that is about to be dropped

   - Wait for the ondemand_boject_worker to finish before dropping a
     cachefiles object to prevent use-after-free

   - Use cyclic allocation for message ids to better handle id recycling

   - Add missing lock protection when iterating through the xarray when
     polling

  netfs:

   - Use standard logging helpers for debug logging

  VFS:

   - Fix potential use-after-free in file locks during
     trace_posix_lock_inode(). The tracepoint could fire while another
     task raced it and freed the lock that was requested to be traced

   - Only increment the nr_dentry_negative counter for dentries that are
     present on the superblock LRU. Currently, DCACHE_LRU_LIST list is
     used to detect this case. However, the flag is also raised in
     combination with DCACHE_SHRINK_LIST to indicate that dentry->d_lru
     is used. So checking only DCACHE_LRU_LIST will lead to wrong
     nr_dentry_negative count. Fix the check to not count dentries that
     are on a shrink related list

  Misc:

   - hfsplus: fix an uninitialized value issue in copy_name

   - minix: fix minixfs_rename with HIGHMEM. It still uses kunmap() even
     though we switched it to kmap_local_page() a while ago"

* tag 'vfs-6.10-rc8.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  minixfs: Fix minixfs_rename with HIGHMEM
  hfsplus: fix uninit-value in copy_name
  vfs: don't mod negative dentry count when on shrinker list
  filelock: fix potential use-after-free in posix_lock_inode
  cachefiles: add missing lock protection when polling
  cachefiles: cyclic allocation of msg_id to avoid reuse
  cachefiles: wait for ondemand_object_worker to finish when dropping object
  cachefiles: cancel all requests for the object that is being dropped
  cachefiles: stop sending new request when dropping object
  cachefiles: propagate errors from vfs_getxattr() to avoid infinite loop
  cachefiles: fix slab-use-after-free in cachefiles_withdraw_cookie()
  cachefiles: fix slab-use-after-free in fscache_withdraw_volume()
  netfs, fscache: export fscache_put_volume() and add fscache_try_get_volume()
  netfs: Switch debug logging to pr_debug()

No check is done on the size of the data to be transmiited. This causes
a kernel panic when this size exceeds the sg_miter's length.

Limit the number of transmitted bytes to sgm->length.

Cc: stable@vger.kernel.org
Fixes: ed01d210 ("mmc: davinci_mmc: Use sg_miter for PIO")
Signed-off-by: Bastien Curutchet <bastien.curutchet@bootlin.com>
Link: https://lore.kernel.org/r/20240711081838.47256-2-bastien.curutchet@bootlin.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

blk_queue_max_segment_size() ensured:

	if (max_size < PAGE_SIZE)
		max_size = PAGE_SIZE;

whereas:

blk_validate_limits() makes it an error:

	if (WARN_ON_ONCE(lim->max_segment_size < PAGE_SIZE))
		return -EINVAL;

The change from one to the other, exposed sdhci which was setting maximum
segment size too low in some circumstances.

Fix the maximum segment size when it is too low.

Fixes: 616f8766 ("mmc: pass queue_limits to blk_mq_alloc_disk")
Cc: stable@vger.kernel.org
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Link: https://lore.kernel.org/r/20240710180737.142504-1-adrian.hunter@intel.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Merge tag 'asoc-fix-v6.10-rc7' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus

ASoC: Fixes for v6.10

A few fairly small fixes for ASoC, there's a relatively large set of
hardening changes for the cs_dsp firmware file parsing and a couple of
other small device specific fixes.

Currently, when built with "make W=1", the following warnings are
generated:

net/ceph/crush/mapper.c:466: warning: Function parameter or struct member 'work' not described in 'crush_choose_firstn'
net/ceph/crush/mapper.c:466: warning: Function parameter or struct member 'weight' not described in 'crush_choose_firstn'
net/ceph/crush/mapper.c:466: warning: Function parameter or struct member 'weight_max' not described in 'crush_choose_firstn'
net/ceph/crush/mapper.c:466: warning: Function parameter or struct member 'choose_args' not described in 'crush_choose_firstn'

Update the crush_choose_firstn() kernel-doc to document these
parameters.
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

Currently, when built with "make W=1", the following warnings are
generated:

net/ceph/crush/mapper.c:655: warning: Function parameter or struct member 'map' not described in 'crush_choose_indep'
net/ceph/crush/mapper.c:655: warning: Function parameter or struct member 'work' not described in 'crush_choose_indep'
net/ceph/crush/mapper.c:655: warning: Function parameter or struct member 'bucket' not described in 'crush_choose_indep'
net/ceph/crush/mapper.c:655: warning: Function parameter or struct member 'weight' not described in 'crush_choose_indep'
net/ceph/crush/mapper.c:655: warning: Function parameter or struct member 'weight_max' not described in 'crush_choose_indep'
net/ceph/crush/mapper.c:655: warning: Function parameter or struct member 'x' not described in 'crush_choose_indep'
net/ceph/crush/mapper.c:655: warning: Function parameter or struct member 'left' not described in 'crush_choose_indep'
net/ceph/crush/mapper.c:655: warning: Function parameter or struct member 'numrep' not described in 'crush_choose_indep'
net/ceph/crush/mapper.c:655: warning: Function parameter or struct member 'type' not described in 'crush_choose_indep'
net/ceph/crush/mapper.c:655: warning: Function parameter or struct member 'out' not described in 'crush_choose_indep'
net/ceph/crush/mapper.c:655: warning: Function parameter or struct member 'outpos' not described in 'crush_choose_indep'
net/ceph/crush/mapper.c:655: warning: Function parameter or struct member 'tries' not described in 'crush_choose_indep'
net/ceph/crush/mapper.c:655: warning: Function parameter or struct member 'recurse_tries' not described in 'crush_choose_indep'
net/ceph/crush/mapper.c:655: warning: Function parameter or struct member 'recurse_to_leaf' not described in 'crush_choose_indep'
net/ceph/crush/mapper.c:655: warning: Function parameter or struct member 'out2' not described in 'crush_choose_indep'
net/ceph/crush/mapper.c:655: warning: Function parameter or struct member 'parent_r' not described in 'crush_choose_indep'
net/ceph/crush/mapper.c:655: warning: Function parameter or struct member 'choose_args' not described in 'crush_choose_indep'

These warnings are generated because the prologue comment for
crush_choose_indep() uses the kernel-doc prefix, but the actual
comment is a very brief description that is not in kernel-doc
format. Since this is a static function there is no need to fully
document the function, so replace the kernel-doc comment prefix with a
standard comment prefix to remove these warnings.
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

Pablo Neira Ayuso says:

====================
Netfilter fixes for net

The following batch contains Netfilter fixes for net:

Patch #1 fixes a bogus WARN_ON splat in nfnetlink_queue.

Patch #2 fixes a crash due to stack overflow in chain loop detection
	 by using the existing chain validation routines

Both patches from Florian Westphal.

netfilter pull request 24-07-11

* tag 'nf-24-07-11' of git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf:
  netfilter: nf_tables: prefer nft_chain_validate
  netfilter: nfnetlink_queue: drop bogus WARN_ON
====================

Link: https://patch.msgid.link/20240711093948.3816-1-pablo@netfilter.orgSigned-off-by: Paolo Abeni <pabeni@redhat.com>

Daniel Borkmann says:

====================
pull-request: bpf 2024-07-11

The following pull-request contains BPF updates for your *net* tree.

We've added 4 non-merge commits during the last 2 day(s) which contain
a total of 4 files changed, 262 insertions(+), 19 deletions(-).

The main changes are:

1) Fixes for a BPF timer lockup and a use-after-free scenario when timers
   are used concurrently, from Kumar Kartikeya Dwivedi.

2) Fix the argument order in the call to bpf_map_kvcalloc() which could
   otherwise lead to a compilation error, from Mohammad Shehar Yaar Tausif.

bpf-for-netdev

* tag 'for-netdev' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf:
  selftests/bpf: Add timer lockup selftest
  bpf: Defer work in bpf_timer_cancel_and_free
  bpf: Fail bpf_timer_cancel when callback is being cancelled
  bpf: fix order of args in call to bpf_map_kvcalloc
====================

Link: https://patch.msgid.link/20240711084016.25757-1-daniel@iogearbox.netSigned-off-by: Paolo Abeni <pabeni@redhat.com>

When using a BPF program on kernel_connect(), the call can return -EPERM. This
causes xs_tcp_setup_socket() to loop forever, filling up the syslog and causing
the kernel to potentially freeze up.

Neil suggested:

  This will propagate -EPERM up into other layers which might not be ready
  to handle it. It might be safer to map EPERM to an error we would be more
  likely to expect from the network system - such as ECONNREFUSED or ENETDOWN.

ECONNREFUSED as error seems reasonable. For programs setting a different error
can be out of reach (see handling in 4fbac77d) in particular on kernels
which do not have f10d0596 ("bpf: Make BPF_PROG_RUN_ARRAY return -err
instead of allow boolean"), thus given that it is better to simply remap for
consistent behavior. UDP does handle EPERM in xs_udp_send_request().

Fixes: d74bad4e ("bpf: Hooks for sys_connect")
Fixes: 4fbac77d ("bpf: Hooks for sys_bind")
Co-developed-by: Lex Siegel <usiegl00@gmail.com>
Signed-off-by: Lex Siegel <usiegl00@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Neil Brown <neilb@suse.de>
Cc: Trond Myklebust <trondmy@kernel.org>
Cc: Anna Schumaker <anna@kernel.org>
Link: https://github.com/cilium/cilium/issues/33395
Link: https://lore.kernel.org/bpf/171374175513.12877.8993642908082014881@noble.neil.brown.name
Link: https://patch.msgid.link/9069ec1d59e4b2129fc23433349fd5580ad43921.1720075070.git.daniel@iogearbox.netSigned-off-by: Paolo Abeni <pabeni@redhat.com>

KASAN reports the following UAF:

 BUG: KASAN: slab-use-after-free in tcf_ct_flow_table_process_conn+0x12b/0x380 [act_ct]
 Read of size 1 at addr ffff888c07603600 by task handler130/6469

 Call Trace:
  <IRQ>
  dump_stack_lvl+0x48/0x70
  print_address_description.constprop.0+0x33/0x3d0
  print_report+0xc0/0x2b0
  kasan_report+0xd0/0x120
  __asan_load1+0x6c/0x80
  tcf_ct_flow_table_process_conn+0x12b/0x380 [act_ct]
  tcf_ct_act+0x886/0x1350 [act_ct]
  tcf_action_exec+0xf8/0x1f0
  fl_classify+0x355/0x360 [cls_flower]
  __tcf_classify+0x1fd/0x330
  tcf_classify+0x21c/0x3c0
  sch_handle_ingress.constprop.0+0x2c5/0x500
  __netif_receive_skb_core.constprop.0+0xb25/0x1510
  __netif_receive_skb_list_core+0x220/0x4c0
  netif_receive_skb_list_internal+0x446/0x620
  napi_complete_done+0x157/0x3d0
  gro_cell_poll+0xcf/0x100
  __napi_poll+0x65/0x310
  net_rx_action+0x30c/0x5c0
  __do_softirq+0x14f/0x491
  __irq_exit_rcu+0x82/0xc0
  irq_exit_rcu+0xe/0x20
  common_interrupt+0xa1/0xb0
  </IRQ>
  <TASK>
  asm_common_interrupt+0x27/0x40

 Allocated by task 6469:
  kasan_save_stack+0x38/0x70
  kasan_set_track+0x25/0x40
  kasan_save_alloc_info+0x1e/0x40
  __kasan_krealloc+0x133/0x190
  krealloc+0xaa/0x130
  nf_ct_ext_add+0xed/0x230 [nf_conntrack]
  tcf_ct_act+0x1095/0x1350 [act_ct]
  tcf_action_exec+0xf8/0x1f0
  fl_classify+0x355/0x360 [cls_flower]
  __tcf_classify+0x1fd/0x330
  tcf_classify+0x21c/0x3c0
  sch_handle_ingress.constprop.0+0x2c5/0x500
  __netif_receive_skb_core.constprop.0+0xb25/0x1510
  __netif_receive_skb_list_core+0x220/0x4c0
  netif_receive_skb_list_internal+0x446/0x620
  napi_complete_done+0x157/0x3d0
  gro_cell_poll+0xcf/0x100
  __napi_poll+0x65/0x310
  net_rx_action+0x30c/0x5c0
  __do_softirq+0x14f/0x491

 Freed by task 6469:
  kasan_save_stack+0x38/0x70
  kasan_set_track+0x25/0x40
  kasan_save_free_info+0x2b/0x60
  ____kasan_slab_free+0x180/0x1f0
  __kasan_slab_free+0x12/0x30
  slab_free_freelist_hook+0xd2/0x1a0
  __kmem_cache_free+0x1a2/0x2f0
  kfree+0x78/0x120
  nf_conntrack_free+0x74/0x130 [nf_conntrack]
  nf_ct_destroy+0xb2/0x140 [nf_conntrack]
  __nf_ct_resolve_clash+0x529/0x5d0 [nf_conntrack]
  nf_ct_resolve_clash+0xf6/0x490 [nf_conntrack]
  __nf_conntrack_confirm+0x2c6/0x770 [nf_conntrack]
  tcf_ct_act+0x12ad/0x1350 [act_ct]
  tcf_action_exec+0xf8/0x1f0
  fl_classify+0x355/0x360 [cls_flower]
  __tcf_classify+0x1fd/0x330
  tcf_classify+0x21c/0x3c0
  sch_handle_ingress.constprop.0+0x2c5/0x500
  __netif_receive_skb_core.constprop.0+0xb25/0x1510
  __netif_receive_skb_list_core+0x220/0x4c0
  netif_receive_skb_list_internal+0x446/0x620
  napi_complete_done+0x157/0x3d0
  gro_cell_poll+0xcf/0x100
  __napi_poll+0x65/0x310
  net_rx_action+0x30c/0x5c0
  __do_softirq+0x14f/0x491

The ct may be dropped if a clash has been resolved but is still passed to
the tcf_ct_flow_table_process_conn function for further usage. This issue
can be fixed by retrieving ct from skb again after confirming conntrack.

Fixes: 0cc254e5 ("net/sched: act_ct: Offload connections with commit action")
Co-developed-by: Gerald Yang <gerald.yang@canonical.com>
Signed-off-by: Gerald Yang <gerald.yang@canonical.com>
Signed-off-by: Chengen Du <chengen.du@canonical.com>
Link: https://patch.msgid.link/20240710053747.13223-1-chengen.du@canonical.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

The amount of TX space in the hardware buffer is tracked in the tx_space
variable. The initial value is currently only set during driver probing.

After closing the interface and reopening it the tx_space variable has
the last value it had before close. If it is smaller than the size of
the first send packet after reopeing the interface the queue will be
stopped. The queue is woken up after receiving a TX interrupt but this
will never happen since we did not send anything.

This commit moves the initialization of the tx_space variable to the
ks8851_net_open function right before starting the TX queue. Also query
the value from the hardware instead of using a hard coded value.

Only the SPI chip variant is affected by this issue because only this
driver variant actually depends on the tx_space variable in the xmit
function.

Fixes: 3dc5d445 ("net: ks8851: Fix TX stall caused by TX buffer overrun")
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Simon Horman <horms@kernel.org>
Cc: netdev@vger.kernel.org
Cc: stable@vger.kernel.org # 5.10+
Signed-off-by: Ronald Wahl <ronald.wahl@raritan.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://patch.msgid.link/20240709195845.9089-1-rwahl@gmx.deSigned-off-by: Paolo Abeni <pabeni@redhat.com>

syzkaller triggered the warning [0] in udp_v4_early_demux().

In udp_v[46]_early_demux() and sk_lookup(), we do not touch the refcount
of the looked-up sk and use sock_pfree() as skb->destructor, so we check
SOCK_RCU_FREE to ensure that the sk is safe to access during the RCU grace
period.

Currently, SOCK_RCU_FREE is flagged for a bound socket after being put
into the hash table.  Moreover, the SOCK_RCU_FREE check is done too early
in udp_v[46]_early_demux() and sk_lookup(), so there could be a small race
window:

  CPU1                                 CPU2
  ----                                 ----
  udp_v4_early_demux()                 udp_lib_get_port()
  |                                    |- hlist_add_head_rcu()
  |- sk = __udp4_lib_demux_lookup()    |
  |- DEBUG_NET_WARN_ON_ONCE(sk_is_refcounted(sk));
                                       `- sock_set_flag(sk, SOCK_RCU_FREE)

We had the same bug in TCP and fixed it in commit 871019b2 ("net:
set SOCK_RCU_FREE before inserting socket into hashtable").

Let's apply the same fix for UDP.

[0]:
WARNING: CPU: 0 PID: 11198 at net/ipv4/udp.c:2599 udp_v4_early_demux+0x481/0xb70 net/ipv4/udp.c:2599
Modules linked in:
CPU: 0 PID: 11198 Comm: syz-executor.1 Not tainted 6.9.0-g93bda330 #13
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014
RIP: 0010:udp_v4_early_demux+0x481/0xb70 net/ipv4/udp.c:2599
Code: c5 7a 15 fe bb 01 00 00 00 44 89 e9 31 ff d3 e3 81 e3 bf ef ff ff 89 de e8 2c 74 15 fe 85 db 0f 85 02 06 00 00 e8 9f 7a 15 fe <0f> 0b e8 98 7a 15 fe 49 8d 7e 60 e8 4f 39 2f fe 49 c7 46 60 20 52
RSP: 0018:ffffc9000ce3fa58 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8318c92c
RDX: ffff888036ccde00 RSI: ffffffff8318c2f1 RDI: 0000000000000001
RBP: ffff88805a2dd6e0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0001ffffffffffff R12: ffff88805a2dd680
R13: 0000000000000007 R14: ffff88800923f900 R15: ffff88805456004e
FS:  00007fc449127640(0000) GS:ffff88807dc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc449126e38 CR3: 000000003de4b002 CR4: 0000000000770ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
PKRU: 55555554
Call Trace:
 <TASK>
 ip_rcv_finish_core.constprop.0+0xbdd/0xd20 net/ipv4/ip_input.c:349
 ip_rcv_finish+0xda/0x150 net/ipv4/ip_input.c:447
 NF_HOOK include/linux/netfilter.h:314 [inline]
 NF_HOOK include/linux/netfilter.h:308 [inline]
 ip_rcv+0x16c/0x180 net/ipv4/ip_input.c:569
 __netif_receive_skb_one_core+0xb3/0xe0 net/core/dev.c:5624
 __netif_receive_skb+0x21/0xd0 net/core/dev.c:5738
 netif_receive_skb_internal net/core/dev.c:5824 [inline]
 netif_receive_skb+0x271/0x300 net/core/dev.c:5884
 tun_rx_batched drivers/net/tun.c:1549 [inline]
 tun_get_user+0x24db/0x2c50 drivers/net/tun.c:2002
 tun_chr_write_iter+0x107/0x1a0 drivers/net/tun.c:2048
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x76f/0x8d0 fs/read_write.c:590
 ksys_write+0xbf/0x190 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x41/0x50 fs/read_write.c:652
 x64_sys_call+0xe66/0x1990 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x4b/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x4b/0x53
RIP: 0033:0x7fc44a68bc1f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 e9 cf f5 ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 3c d0 f5 ff 48
RSP: 002b:00007fc449126c90 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000004bc050 RCX: 00007fc44a68bc1f
RDX: 0000000000000032 RSI: 00000000200000c0 RDI: 00000000000000c8
RBP: 00000000004bc050 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000032 R11: 0000000000000293 R12: 0000000000000000
R13: 000000000000000b R14: 00007fc44a5ec530 R15: 0000000000000000
 </TASK>

Fixes: 6acc9b43 ("bpf: Add helper to retrieve socket in BPF")
Reported-by: syzkaller <syzkaller@googlegroups.com>
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20240709191356.24010-1-kuniyu@amazon.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

nft_chain_validate already performs loop detection because a cycle will
result in a call stack overflow (ctx->level >= NFT_JUMP_STACK_SIZE).

It also follows maps via ->validate callback in nft_lookup, so there
appears no reason to iterate the maps again.

nf_tables_check_loops() and all its helper functions can be removed.
This improves ruleset load time significantly, from 23s down to 12s.

This also fixes a crash bug. Old loop detection code can result in
unbounded recursion:

BUG: TASK stack guard page was hit at ....
Oops: stack guard page: 0000 [#1] PREEMPT SMP KASAN
CPU: 4 PID: 1539 Comm: nft Not tainted 6.10.0-rc5+ #1
[..]

with a suitable ruleset during validation of register stores.

I can't see any actual reason to attempt to check for this from
nft_validate_register_store(), at this point the transaction is still in
progress, so we don't have a full picture of the rule graph.

For nf-next it might make sense to either remove it or make this depend
on table->validate_state in case we could catch an error earlier
(for improved error reporting to userspace).

Fixes: 20a69341 ("netfilter: nf_tables: add netlink set API")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

Happens when rules get flushed/deleted while packet is out, so remove
this WARN_ON.

This WARN exists in one form or another since v4.14, no need to backport
this to older releases, hence use a more recent fixes tag.

Fixes: 3f801968 ("netfilter: move nf_reinject into nfnetlink_queue modules")
Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202407081453.11ac0f63-lkp@intel.comSigned-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

Do not attach SQI value if link is down. "SQI values are only valid if
link-up condition is present" per OpenAlliance specification of
100Base-T1 Interoperability Test suite [1]. The same rule would apply
for other link types.

[1] https://opensig.org/automotive-ethernet-specifications/#

Fixes: 80660219 ("ethtool: provide UAPI for PHY Signal Quality Index (SQI)")
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Woojung Huh <woojung.huh@microchip.com>
Link: https://patch.msgid.link/20240709061943.729381-1-o.rempel@pengutronix.deSigned-off-by: Paolo Abeni <pabeni@redhat.com>

Since 'ppp_async_encode()' assumes valid LCP packets (with code
from 1 to 7 inclusive), add 'ppp_check_packet()' to ensure that
LCP packet has an actual body beyond PPP_LCP header bytes, and
reject claimed-as-LCP but actually malformed data otherwise.

Reported-by: syzbot+ec0723ba9605678b14bf@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=ec0723ba9605678b14bf
Fixes: 1da177e4 ("Linux-2.6.12-rc2")
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Add a selftest that tries to trigger a situation where two timer callbacks
are attempting to cancel each other's timer. By running them continuously,
we hit a condition where both run in parallel and cancel each other.

Without the fix in the previous patch, this would cause a lockup as
hrtimer_cancel on either side will wait for forward progress from the
callback.

Ensure that this situation leads to a EDEADLK error.
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20240711052709.2148616-1-memxor@gmail.com

The below commit introduced a warning message when phy state is not in
the states: PHY_HALTED, PHY_READY, and PHY_UP.
commit 744d23c7 ("net: phy: Warn about incorrect mdio_bus_phy_resume() state")

mtk-star-emac doesn't need mdiobus suspend/resume. To fix the warning
message during resume, indicate the phy resume/suspend is managed by the
mac when probing.

Fixes: 744d23c7 ("net: phy: Warn about incorrect mdio_bus_phy_resume() state")
Signed-off-by: Jian Hui Lee <jianhui.lee@canonical.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://patch.msgid.link/20240708065210.4178980-1-jianhui.lee@canonical.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

Commit 861e8086 ("e1000e: move force SMBUS from enable ulp function
to avoid PHY loss issue") resolved a PHY access loss during suspend on
Meteor Lake consumer platforms, but it affected corporate systems
incorrectly.

A better fix, working for both consumer and corporate systems, was
proposed in commit bfd546a5 ("e1000e: move force SMBUS near the end
of enable_ulp function"). However, it introduced a regression on older
devices, such as [8086:15B8], [8086:15F9], [8086:15BE].

This patch aims to fix the secondary regression, by limiting the scope of
the changes to Meteor Lake platforms only.

Fixes: bfd546a5 ("e1000e: move force SMBUS near the end of enable_ulp function")
Reported-by: Todd Brandt <todd.e.brandt@intel.com>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218940Reported-by: Dieter Mummenschanz <dmummenschanz@web.de>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218936Signed-off-by: Vitaly Lifshits <vitaly.lifshits@intel.com>
Tested-by: Mor Bar-Gabay <morx.bar.gabay@intel.com> (A Contingent Worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240709203123.2103296-1-anthony.l.nguyen@intel.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

If a TCP socket is using TCP_USER_TIMEOUT, and the other peer
retracted its window to zero, tcp_retransmit_timer() can
retransmit a packet every two jiffies (2 ms for HZ=1000),
for about 4 minutes after TCP_USER_TIMEOUT has 'expired'.

The fix is to make sure tcp_rtx_probe0_timed_out() takes
icsk->icsk_user_timeout into account.

Before blamed commit, the socket would not timeout after
icsk->icsk_user_timeout, but would use standard exponential
backoff for the retransmits.

Also worth noting that before commit e89688e3 ("net: tcp:
fix unexcepted socket die when snd_wnd is 0"), the issue
would last 2 minutes instead of 4.

Fixes: b701a99e ("tcp: Add tcp_clamp_rto_to_user_timeout() helper to improve accuracy")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Reviewed-by: Jason Xing <kerneljasonxing@gmail.com>
Reviewed-by: Jon Maxwell <jmaxwell37@gmail.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20240710001402.2758273-1-edumazet@google.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Kumar Kartikeya Dwivedi says:

====================
Fixes for BPF timer lockup and UAF

The following patches contain fixes for timer lockups and a
use-after-free scenario.

This set proposes to fix the following lockup situation for BPF timers.

CPU 1					CPU 2

bpf_timer_cb				bpf_timer_cb
  timer_cb1				  timer_cb2
    bpf_timer_cancel(timer_cb2)		    bpf_timer_cancel(timer_cb1)
      hrtimer_cancel			      hrtimer_cancel

In this case, both callbacks will continue waiting for each other to
finish synchronously, causing a lockup.

The proposed fix adds support for tracking in-flight cancellations
*begun by other timer callbacks* for a particular BPF timer.  Whenever
preparing to call hrtimer_cancel, a callback will increment the target
timer's counter, then inspect its in-flight cancellations, and if
non-zero, return -EDEADLK to avoid situations where the target timer's
callback is waiting for its completion.

This does mean that in cases where a callback is fired and cancelled, it
will be unable to cancel any timers in that execution. This can be
alleviated by maintaining the list of waiting callbacks in bpf_hrtimer
and searching through it to avoid interdependencies, but this may
introduce additional delays in bpf_timer_cancel, in addition to
requiring extra state at runtime which may need to be allocated or
reused from bpf_hrtimer storage. Moreover, extra synchronization is
needed to delete these elements from the list of waiting callbacks once
hrtimer_cancel has finished.

The second patch is for a deadlock situation similar to above in
bpf_timer_cancel_and_free, but also a UAF scenario that can occur if
timer is armed before entering it, if hrtimer_running check causes the
hrtimer_cancel call to be skipped.

As seen above, synchronous hrtimer_cancel would lead to deadlock (if
same callback tries to free its timer, or two timers free each other),
therefore we queue work onto the global workqueue to ensure outstanding
timers are cancelled before bpf_hrtimer state is freed.

Further details are in the patches.
====================

Link: https://lore.kernel.org/r/20240709185440.1104957-1-memxor@gmail.comSigned-off-by: Alexei Starovoitov <ast@kernel.org>