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  1. 11 Dec, 2021 8 commits
  3. 10 Dec, 2021 22 commits
  5. 09 Dec, 2021 10 commits
    • Linus Torvalds's avatar
      Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma · c741e491
      Linus Torvalds authored 
      Pull rdma fixes from Jason Gunthorpe:
 "Quite a few small bug fixes old and new, also Doug Ledford is retiring
  now, we thank him for his work. Details:

   - Use after free in rxe

   - mlx5 DM regression

   - hns bugs triggred by device reset

   - Two fixes for CONFIG_DEBUG_PREEMPT

   - Several longstanding corner case bugs in hfi1

   - Two irdma data path bugs in rare cases and some memory issues"

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma:
  RDMA/irdma: Don't arm the CQ more than two times if no CE for this CQ
  RDMA/irdma: Report correct WC errors
  RDMA/irdma: Fix a potential memory allocation issue in 'irdma_prm_add_pble_mem()'
  RDMA/irdma: Fix a user-after-free in add_pble_prm
  IB/hfi1: Fix leak of rcvhdrtail_dummy_kvaddr
  IB/hfi1: Fix early init panic
  IB/hfi1: Insure use of smp_processor_id() is preempt disabled
  IB/hfi1: Correct guard on eager buffer deallocation
  RDMA/rtrs: Call {get,put}_cpu_ptr to silence a debug kernel warning
  RDMA/hns: Do not destroy QP resources in the hw resetting phase
  RDMA/hns: Do not halt commands during reset until later
  Remove Doug Ledford from MAINTAINERS
  RDMA/mlx5: Fix releasing unallocated memory in dereg MR flow
  RDMA: Fix use-after-free in rxe_queue_cleanup
      c741e491
    • Linus Torvalds's avatar
      Merge tag 'net-5.16-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net · ded746bf
      Linus Torvalds authored 
      Pull networking fixes from Jakub Kicinski:
 "Including fixes from bpf, can and netfilter.

  Current release - regressions:

   - bpf, sockmap: re-evaluate proto ops when psock is removed from
     sockmap

  Current release - new code bugs:

   - bpf: fix bpf_check_mod_kfunc_call for built-in modules

   - ice: fixes for TC classifier offloads

   - vrf: don't run conntrack on vrf with !dflt qdisc

  Previous releases - regressions:

   - bpf: fix the off-by-two error in range markings

   - seg6: fix the iif in the IPv6 socket control block

   - devlink: fix netns refcount leak in devlink_nl_cmd_reload()

   - dsa: mv88e6xxx: fix "don't use PHY_DETECT on internal PHY's"

   - dsa: mv88e6xxx: allow use of PHYs on CPU and DSA ports

  Previous releases - always broken:

   - ethtool: do not perform operations on net devices being
     unregistered

   - udp: use datalen to cap max gso segments

   - ice: fix races in stats collection

   - fec: only clear interrupt of handling queue in fec_enet_rx_queue()

   - m_can: pci: fix incorrect reference clock rate

   - m_can: disable and ignore ELO interrupt

   - mvpp2: fix XDP rx queues registering

  Misc:

   - treewide: add missing includes masked by cgroup -> bpf.h
     dependency"

* tag 'net-5.16-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (82 commits)
  net: dsa: mv88e6xxx: allow use of PHYs on CPU and DSA ports
  net: wwan: iosm: fixes unable to send AT command during mbim tx
  net: wwan: iosm: fixes net interface nonfunctional after fw flash
  net: wwan: iosm: fixes unnecessary doorbell send
  net: dsa: felix: Fix memory leak in felix_setup_mmio_filtering
  MAINTAINERS: s390/net: remove myself as maintainer
  net/sched: fq_pie: prevent dismantle issue
  net: mana: Fix memory leak in mana_hwc_create_wq
  seg6: fix the iif in the IPv6 socket control block
  nfp: Fix memory leak in nfp_cpp_area_cache_add()
  nfc: fix potential NULL pointer deref in nfc_genl_dump_ses_done
  nfc: fix segfault in nfc_genl_dump_devices_done
  udp: using datalen to cap max gso segments
  net: dsa: mv88e6xxx: error handling for serdes_power functions
  can: kvaser_usb: get CAN clock frequency from device
  can: kvaser_pciefd: kvaser_pciefd_rx_error_frame(): increase correct stats->{rx,tx}_errors counter
  net: mvpp2: fix XDP rx queues registering
  vmxnet3: fix minimum vectors alloc issue
  net, neigh: clear whole pneigh_entry at alloc time
  net: dsa: mv88e6xxx: fix "don't use PHY_DETECT on internal PHY's"
  ...
      ded746bf
    • Linus Torvalds's avatar
      Merge tag 'mtd/fixes-for-5.16-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux · 27698cd2
      Linus Torvalds authored 
      Pull mtd fixes from Miquel Raynal:
 "MTD fixes:

   - dataflash: Add device-tree SPI IDs to avoid new warnings

  Raw NAND fixes:

   - Fix nand_choose_best_timings() on unsupported interface

   - Fix nand_erase_op delay (wrong unit)

   - fsmc:
      - Fix timing computation
      - Take instruction delay into account

   - denali:
      - Add the dependency on HAS_IOMEM to silence robots"

* tag 'mtd/fixes-for-5.16-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux:
  mtd: dataflash: Add device-tree SPI IDs
  mtd: rawnand: fsmc: Fix timing computation
  mtd: rawnand: fsmc: Take instruction delay into account
  mtd: rawnand: Fix nand_choose_best_timings() on unsupported interface
  mtd: rawnand: Fix nand_erase_op delay
  mtd: rawnand: denali: Add the dependency on HAS_IOMEM
      27698cd2
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid · 03090cc7
      Linus Torvalds authored 
      Pull HID fixes from Jiri Kosina:

 - fixes for various drivers which assume that a HID device is on USB
   transport, but that might not necessarily be the case, as the device
   can be faked by uhid. (Greg, Benjamin Tissoires)

 - fix for spurious wakeups on certain Lenovo notebooks (Thomas
   Weißschuh)

 - a few other device-specific quirks

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid:
  HID: Ignore battery for Elan touchscreen on Asus UX550VE
  HID: intel-ish-hid: ipc: only enable IRQ wakeup when requested
  HID: google: add eel USB id
  HID: add USB_HID dependancy to hid-prodikeys
  HID: add USB_HID dependancy to hid-chicony
  HID: bigbenff: prevent null pointer dereference
  HID: sony: fix error path in probe
  HID: add USB_HID dependancy on some USB HID drivers
  HID: check for valid USB device for many HID drivers
  HID: wacom: fix problems when device is not a valid USB device
  HID: add hid_is_usb() function to make it simpler for USB detection
  HID: quirks: Add quirk for the Microsoft Surface 3 type-cover
      03090cc7
    • Xie Yongji's avatar
      aio: Fix incorrect usage of eventfd_signal_allowed() · 4b374986
      Xie Yongji authored 
      We should defer eventfd_signal() to the workqueue when
eventfd_signal_allowed() return false rather than return
true.

Fixes: b542e383 ("eventfd: Make signal recursion protection a task bit")
Signed-off-by: default avatarXie Yongji <xieyongji@bytedance.com>
Link: https://lore.kernel.org/r/20210913111928.98-1-xieyongji@bytedance.comReviewed-by: default avatarEric Biggers <ebiggers@google.com>
Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
      4b374986
    • Eric Biggers's avatar
      aio: fix use-after-free due to missing POLLFREE handling · 50252e4b
      Eric Biggers authored 
      signalfd_poll() and binder_poll() are special in that they use a
waitqueue whose lifetime is the current task, rather than the struct
file as is normally the case.  This is okay for blocking polls, since a
blocking poll occurs within one task; however, non-blocking polls
require another solution.  This solution is for the queue to be cleared
before it is freed, by sending a POLLFREE notification to all waiters.

Unfortunately, only eventpoll handles POLLFREE.  A second type of
non-blocking poll, aio poll, was added in kernel v4.18, and it doesn't
handle POLLFREE.  This allows a use-after-free to occur if a signalfd or
binder fd is polled with aio poll, and the waitqueue gets freed.

Fix this by making aio poll handle POLLFREE.

A patch by Ramji Jiyani <ramjiyani@google.com>
(https://lore.kernel.org/r/20211027011834.2497484-1-ramjiyani@google.com)
tried to do this by making aio_poll_wake() always complete the request
inline if POLLFREE is seen.  However, that solution had two bugs.
First, it introduced a deadlock, as it unconditionally locked the aio
context while holding the waitqueue lock, which inverts the normal
locking order.  Second, it didn't consider that POLLFREE notifications
are missed while the request has been temporarily de-queued.

The second problem was solved by my previous patch.  This patch then
properly fixes the use-after-free by handling POLLFREE in a
deadlock-free way.  It does this by taking advantage of the fact that
freeing of the waitqueue is RCU-delayed, similar to what eventpoll does.

Fixes: 2c14fa83 ("aio: implement IOCB_CMD_POLL")
Cc: <stable@vger.kernel.org> # v4.18+
Link: https://lore.kernel.org/r/20211209010455.42744-6-ebiggers@kernel.orgSigned-off-by: default avatarEric Biggers <ebiggers@google.com>
      50252e4b
    • Eric Biggers's avatar
      aio: keep poll requests on waitqueue until completed · 363bee27
      Eric Biggers authored 
      Currently, aio_poll_wake() will always remove the poll request from the
waitqueue.  Then, if aio_poll_complete_work() sees that none of the
polled events are ready and the request isn't cancelled, it re-adds the
request to the waitqueue.  (This can easily happen when polling a file
that doesn't pass an event mask when waking up its waitqueue.)

This is fundamentally broken for two reasons:

  1. If a wakeup occurs between vfs_poll() and the request being
     re-added to the waitqueue, it will be missed because the request
     wasn't on the waitqueue at the time.  Therefore, IOCB_CMD_POLL
     might never complete even if the polled file is ready.

  2. When the request isn't on the waitqueue, there is no way to be
     notified that the waitqueue is being freed (which happens when its
     lifetime is shorter than the struct file's).  This is supposed to
     happen via the waitqueue entries being woken up with POLLFREE.

Therefore, leave the requests on the waitqueue until they are actually
completed (or cancelled).  To keep track of when aio_poll_complete_work
needs to be scheduled, use new fields in struct poll_iocb.  Remove the
'done' field which is now redundant.

Note that this is consistent with how sys_poll() and eventpoll work;
their wakeup functions do *not* remove the waitqueue entries.

Fixes: 2c14fa83 ("aio: implement IOCB_CMD_POLL")
Cc: <stable@vger.kernel.org> # v4.18+
Link: https://lore.kernel.org/r/20211209010455.42744-5-ebiggers@kernel.orgSigned-off-by: default avatarEric Biggers <ebiggers@google.com>
      363bee27
    • Eric Biggers's avatar
      signalfd: use wake_up_pollfree() · 9537bae0
      Eric Biggers authored 
      wake_up_poll() uses nr_exclusive=1, so it's not guaranteed to wake up
all exclusive waiters.  Yet, POLLFREE *must* wake up all waiters.  epoll
and aio poll are fortunately not affected by this, but it's very
fragile.  Thus, the new function wake_up_pollfree() has been introduced.

Convert signalfd to use wake_up_pollfree().
Reported-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Fixes: d80e731e ("epoll: introduce POLLFREE to flush ->signalfd_wqh before kfree()")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20211209010455.42744-4-ebiggers@kernel.orgSigned-off-by: default avatarEric Biggers <ebiggers@google.com>
      9537bae0
    • Eric Biggers's avatar
      binder: use wake_up_pollfree() · a880b28a
      Eric Biggers authored 
      wake_up_poll() uses nr_exclusive=1, so it's not guaranteed to wake up
all exclusive waiters.  Yet, POLLFREE *must* wake up all waiters.  epoll
and aio poll are fortunately not affected by this, but it's very
fragile.  Thus, the new function wake_up_pollfree() has been introduced.

Convert binder to use wake_up_pollfree().
Reported-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Fixes: f5cb779b ("ANDROID: binder: remove waitqueue when thread exits.")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20211209010455.42744-3-ebiggers@kernel.orgSigned-off-by: default avatarEric Biggers <ebiggers@google.com>
      a880b28a
    • Eric Biggers's avatar
      wait: add wake_up_pollfree() · 42288cb4
      Eric Biggers authored 
      Several ->poll() implementations are special in that they use a
waitqueue whose lifetime is the current task, rather than the struct
file as is normally the case.  This is okay for blocking polls, since a
blocking poll occurs within one task; however, non-blocking polls
require another solution.  This solution is for the queue to be cleared
before it is freed, using 'wake_up_poll(wq, EPOLLHUP | POLLFREE);'.

However, that has a bug: wake_up_poll() calls __wake_up() with
nr_exclusive=1.  Therefore, if there are multiple "exclusive" waiters,
and the wakeup function for the first one returns a positive value, only
that one will be called.  That's *not* what's needed for POLLFREE;
POLLFREE is special in that it really needs to wake up everyone.

Considering the three non-blocking poll systems:

- io_uring poll doesn't handle POLLFREE at all, so it is broken anyway.

- aio poll is unaffected, since it doesn't support exclusive waits.
  However, that's fragile, as someone could add this feature later.

- epoll doesn't appear to be broken by this, since its wakeup function
  returns 0 when it sees POLLFREE.  But this is fragile.

Although there is a workaround (see epoll), it's better to define a
function which always sends POLLFREE to all waiters.  Add such a
function.  Also make it verify that the queue really becomes empty after
all waiters have been woken up.
Reported-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20211209010455.42744-2-ebiggers@kernel.orgSigned-off-by: default avatarEric Biggers <ebiggers@google.com>
      42288cb4
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