Alain Volmat [Tue, 6 Jan 2026 11:34:36 +0000 (12:34 +0100)]
media: stm32: dcmi: continuous mode capture in JPEG
Overall cleanup done allows to now have the JPEG handling
done in the same way as other formats in continuous mode,
allowing to achieve a faster framerate in all resolutions.
Alain Volmat [Tue, 6 Jan 2026 11:34:35 +0000 (12:34 +0100)]
media: stm32: dcmi: use dmaengine_terminate_async in irq context
Whenever receiving an OVERRUN event or an end of frame, the driver stops
currently ongoing DMA transfer since the DCMI stops sending data to dma.
Not doing this would lead to having DMA & DCMI no more synchronized in term
of expected data to be copied.
Since this is done in irq handler context, it is not possible to make any
call that would lead to scheduling hence dmaengine_terminate_sync are not
possible.
Since the dcmi driver is NOT using dma callbacks, it is possible thus to
call instead dmaengine_terminate_async (aka without synchronize) and call
again right after a new dmaengine_submit to setup again a new transfer.
And since this is now a dmaengine_submit_async, there is no need to release
the spinlock around calls to the dmaengine_submit_async.
Alain Volmat [Tue, 6 Jan 2026 11:34:34 +0000 (12:34 +0100)]
media: stm32: dcmi: perform all dma handling within irq_thread
Move all the type of frame handling within the dcmi_irq_thread
handler and do not rely on dma_callback as previously.
This simplifies the code by having only a single path for both
compressed and uncompressed data while also making the system
more reactive since irq_handler have more chances to be called
faster than the dma completion callback. Indeed, in case of the
dma completion callback, this run as a tasklet created by the
dma framework upon getting an interrupt from the dma and run
at a lower priority level than other irq handlers.
Alain Volmat [Tue, 6 Jan 2026 11:34:33 +0000 (12:34 +0100)]
media: stm32: dcmi: rework spin_lock calls
Rework of the spin_lock calls in preparation of the rework
of the data handling of the driver. Keep it straight forward
with basically spin_lock protection around everything except
dmaengine calls that might sleep (ex: synchronize / terminate)
Alain Volmat [Tue, 6 Jan 2026 11:34:31 +0000 (12:34 +0100)]
media: stm32: dcmi: only create dma descriptor once at buf_prepare
Perform the dmaengine prep_slave_sg call within buf_prepare and
mark the descriptor as reusable in order to avoid having to redo
this at every start of the dma.
This also allow to remove the mutex used by the driver to protect
dma descriptors related piece of codes.
Alain Volmat [Tue, 6 Jan 2026 11:34:29 +0000 (12:34 +0100)]
media: stm32: dcmi: Switch from __maybe_unused to pm_ptr()
Letting the compiler remove these functions when the kernel is built
without CONFIG_PM_SLEEP support is simpler and less heavier for builds
than the use of __maybe_unused attributes.
media: i2c: mt9m114: add support for Aptina MI1040
Slightly different version of MT9M114 camera module is used in a several
devices like ASUS Nexus 7 (2012) or ASUS Transformer Prime TF201 and is
called Aptina MI1040. The only difference found so far is lacking ability
to poll STATE register during power on sequence, which causes driver to
fail with time out error. Add state_standby_polling flag to diverge models
and address quirk found in MI1040.
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com> Reviewed-by: Hans de Goede <johannes.goede@oss.qualcomm.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
The Aptina MI1040 is a slightly different version of the MT9M114 camera
module. It is used in several devices, such as the ASUS Nexus 7 (2012) and
the ASUS Transformer Prime TF201. The compatible "onnn,mt9m114" is placed
first in the enum, as it is considered the default compatible value.
Tomi Valkeinen [Thu, 15 Jan 2026 10:07:01 +0000 (12:07 +0200)]
media: rcar-csi2: Optimize rcsi2_calc_mbps()
With modern drivers supporting link-freq, we don't need to do any
calculations based on the bpp and number of lanes when figuring out the
link frequency. However, the code currently always runs code to get the
bpp and number of lanes.
Optimize the rcsi2_calc_mbps() so that we only do that when needed, i.e.
when querying the link-freq is not supported by the upstream subdevice.
Tomi Valkeinen [Thu, 15 Jan 2026 10:07:00 +0000 (12:07 +0200)]
media: rcar-csi2: Simplify rcsi2_calc_mbps()
Instead of taking the bpp and the number of lanes as parameters to
rcsi2_calc_mbps(), change the function to get those parameters inside
the function. This centralizes the code a bit and makes it easier to add
streams support.
Also, in the future when the legacy (non-link-freq) code is removed,
there will be no need to change rcsi2_calc_mbps() parameters.
media: i2c: ds90ub960: Add support for DS90UB954-Q1
DS90UB954-Q1 is an FPDLink-III deserializer that is mostly register
compatible with DS90UB960-Q1. The main difference is that it supports half
of the RX and TX ports, i.e. 2x FPDLink RX ports and 1x CSI TX port.
A couple of differences are between the status registers and the
strobe setting registers. Hence accommodate these differences in
the UB960 driver so that we can reuse a large part of the existing code.
Link: https://www.ti.com/lit/gpn/ds90ub954-q1 Reviewed-by: Jai Luthra <jai.luthra@ideasonboard.com> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> Signed-off-by: Yemike Abhilash Chandra <y-abhilashchandra@ti.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
media: dt-bindings: ti,ds90ub960: Add support for DS90UB954-Q1
DS90UB954-Q1 is an FPDLink-III deserializer that is mostly register
compatible with DS90UB960-Q1. The main difference is that it supports
half of the RX and TX ports, i.e. 2x FPDLink RX ports and 1x CSI TX
port. Therefore, add support for DS90UB954 within the existing bindings.
Link: https://www.ti.com/lit/gpn/ds90ub954-q1 Reviewed-by: Rob Herring (Arm) <robh@kernel.org> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> Signed-off-by: Yemike Abhilash Chandra <y-abhilashchandra@ti.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
media: i2c: ds90ub960: Use enums for chip type and chip family
Replace chip-specific boolean flags with chip_type and chip_family enums.
This simplifies the process of adding support for newer devices and also
improves code readability.
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> Reviewed-by: Jai Luthra <jai.luthra@ideasonboard.com> Signed-off-by: Yemike Abhilash Chandra <y-abhilashchandra@ti.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
media: dt-bindings: ti,ds90ub960: Refactor port definitions
The current bindings duplicate the port definitions for each FPD-Link RX
and CSI-2 TX ports. This results in a large amount of repeated schema
blocks and makes it harder to extend the bindings for new devices.
Refactor the bindings by introducing shared deftinitions for FPD-Link
input ports and CSI-2 output ports. No functional change intended.
Reviewed-by: Rob Herring (Arm) <robh@kernel.org> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> Signed-off-by: Yemike Abhilash Chandra <y-abhilashchandra@ti.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Wenmeng Liu [Fri, 23 Jan 2026 09:19:56 +0000 (17:19 +0800)]
media: i2c: imx412: Extend the power-on waiting time
The Arducam IMX577 module requires a longer reset time than the 1000µs
configured in the current driver. Increase the wait time after power-on
to ensure proper initialization.
Signed-off-by: Wenmeng Liu <wenmeng.liu@oss.qualcomm.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Wenmeng Liu [Fri, 23 Jan 2026 09:19:55 +0000 (17:19 +0800)]
media: i2c: imx412: Assert reset GPIO during probe
Assert the reset GPIO before first power up. This avoids a mismatch where
the first power up (when the reset GPIO defaults deasserted) differs from
subsequent cycles.
Signed-off-by: Wenmeng Liu <wenmeng.liu@oss.qualcomm.com> Fixes: 9214e86c0cc1 ("media: i2c: Add imx412 camera sensor driver") Cc: stable@vger.kernel.org Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Merge tag 'v7.0-rc2' into __tmp-hverkuil-media-tags_br_v7_1a
Linux 7.0-rc2
* tag 'v7.0-rc2': (372 commits)
Linux 7.0-rc2
firewire: ohci: initialize page array to use alloc_pages_bulk() correctly
KVM: always define KVM_CAP_SYNC_MMU
KVM: remove CONFIG_KVM_GENERIC_MMU_NOTIFIER
selftests/bpf: Avoid simplification of crafted bounds test
selftests/bpf: Test refinement of single-value tnum
bpf: Improve bounds when tnum has a single possible value
bpf: Introduce tnum_step to step through tnum's members
bpf: Fix race in devmap on PREEMPT_RT
bpf: Fix race in cpumap on PREEMPT_RT
selftests/bpf: Add tests for special fields races
bpf: Retire rcu_trace_implies_rcu_gp() from local storage
bpf: Delay freeing fields in local storage
bpf: Lose const-ness of map in map_check_btf()
bpf: Register dtor for freeing special fields
PCI: Correct PCI_CAP_EXP_ENDPOINT_SIZEOF_V2 value
smb: client: Use snprintf in cifs_set_cifscreds
mm/slab: initialize slab->stride early to avoid memory ordering issues
smb: client: Don't log plaintext credentials in cifs_set_cifscreds
smb: client: fix broken multichannel with krb5+signing
...
Linus Torvalds [Sun, 1 Mar 2026 23:34:47 +0000 (15:34 -0800)]
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull kvm fixes from Paolo Bonzini:
"Arm:
- Make sure we don't leak any S1POE state from guest to guest when
the feature is supported on the HW, but not enabled on the host
- Propagate the ID registers from the host into non-protected VMs
managed by pKVM, ensuring that the guest sees the intended feature
set
- Drop double kern_hyp_va() from unpin_host_sve_state(), which could
bite us if we were to change kern_hyp_va() to not being idempotent
- Don't leak stage-2 mappings in protected mode
- Correctly align the faulting address when dealing with single page
stage-2 mappings for PAGE_SIZE > 4kB
- Fix detection of virtualisation-capable GICv5 IRS, due to the
maintainer being obviously fat fingered... [his words, not mine]
- Remove duplication of code retrieving the ASID for the purpose of
S1 PT handling
- Fix slightly abusive const-ification in vgic_set_kvm_info()
Generic:
- Remove internal Kconfigs that are now set on all architectures
- Remove per-architecture code to enable KVM_CAP_SYNC_MMU, all
architectures finally enable it in Linux 7.0"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
KVM: always define KVM_CAP_SYNC_MMU
KVM: remove CONFIG_KVM_GENERIC_MMU_NOTIFIER
KVM: arm64: Deduplicate ASID retrieval code
irqchip/gic-v5: Fix inversion of IRS_IDR0.virt flag
KVM: arm64: Revert accidental drop of kvm_uninit_stage2_mmu() for non-NV VMs
KVM: arm64: Fix protected mode handling of pages larger than 4kB
KVM: arm64: vgic: Handle const qualifier from gic_kvm_info allocation type
KVM: arm64: Remove redundant kern_hyp_va() in unpin_host_sve_state()
KVM: arm64: Fix ID register initialization for non-protected pKVM guests
KVM: arm64: Optimise away S1POE handling when not supported by host
KVM: arm64: Hide S1POE from guests when not supported by the host
Linus Torvalds [Sun, 1 Mar 2026 21:32:32 +0000 (13:32 -0800)]
Merge tag 'core-debugobjects-2026-03-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull debugobjects fix from Thomas Gleixner:
"A single fix for debugobjects.
The deferred page initialization prevents debug objects from
allocating slab pages until the initialization is complete. That
causes depletion of the pool and disabling of debugobjects.
The reason is that debugobjects uses __GFP_HIGH for allocations as it
might be invoked from arbitrary contexts. When PREEMPT_COUNT is
disabled there is no way to know whether the context is safe to set
__GFP_KSWAPD_RECLAIM.
This worked until v6.18. Since then allocations w/o a reclaim flag
cause new_slab() to end up in alloc_frozen_pages_nolock_noprof(),
which returns early when deferred page initialization has not yet
completed.
Work around that when PREEMPT_COUNT is enabled as the preempt counter
allows debugobjects to add __GFP_KSWAPD_RECLAIM to the GFP flags when
the context is preemtible. When PREEMPT_COUNT is disabled the context
is unknown and the reclaim bit can't be set because the caller might
hold locks which might deadlock in the allocator.
That makes debugobjects depend on PREEMPT_COUNT ||
!DEFERRED_STRUCT_PAGE_INIT, which limits the coverage slightly, but
keeps it functional for most cases"
* tag 'core-debugobjects-2026-03-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
debugobject: Make it work with deferred page initialization - again
Linus Torvalds [Sun, 1 Mar 2026 21:16:35 +0000 (13:16 -0800)]
Merge tag 'x86-urgent-2026-03-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Ingo Molnar:
- Fix speculative safety in fred_extint()
- Fix __WARN_printf() trap in early_fixup_exception()
- Fix clang-build boot bug for unusual alignments, triggered by
CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B=y
- Replace the final few __ASSEMBLY__ stragglers that snuck in lately
into non-UAPI x86 headers and use __ASSEMBLER__ consistently (again)
* tag 'x86-urgent-2026-03-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/headers: Replace __ASSEMBLY__ stragglers with __ASSEMBLER__
x86/cfi: Fix CFI rewrite for odd alignments
x86/bug: Handle __WARN_printf() trap in early_fixup_exception()
x86/fred: Correct speculative safety in fred_extint()
Linus Torvalds [Sun, 1 Mar 2026 20:15:58 +0000 (12:15 -0800)]
Merge tag 'timers-urgent-2026-03-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer fix from Ingo Molnar:
"Improve the inlining of jiffies_to_msecs() and jiffies_to_usecs(), for
the common HZ=100, 250 or 1000 cases. Only use a function call for odd
HZ values like HZ=300 that generate more code.
The function call overhead showed up in performance tests of the TCP
code"
* tag 'timers-urgent-2026-03-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
time/jiffies: Inline jiffies_to_msecs() and jiffies_to_usecs()
Linus Torvalds [Sun, 1 Mar 2026 19:09:24 +0000 (11:09 -0800)]
Merge tag 'sched-urgent-2026-03-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler fixes from Ingo Molnar:
- Fix zero_vruntime tracking when there's a single task running
- Fix slice protection logic
- Fix the ->vprot logic for reniced tasks
- Fix lag clamping in mixed slice workloads
- Fix objtool uaccess warning (and bug) in the
!CONFIG_RSEQ_SLICE_EXTENSION case caused by unexpected un-inlining,
which triggers with older compilers
- Fix a comment in the rseq registration rseq_size bound check code
- Fix a legacy RSEQ ABI quirk that handled 32-byte area sizes
differently, which special size we now reached naturally and want to
avoid. The visible ugliness of the new reserved field will be avoided
the next time the RSEQ area is extended.
* tag 'sched-urgent-2026-03-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
rseq: slice ext: Ensure rseq feature size differs from original rseq size
rseq: Clarify rseq registration rseq_size bound check comment
sched/core: Fix wakeup_preempt's next_class tracking
rseq: Mark rseq_arm_slice_extension_timer() __always_inline
sched/fair: Fix lag clamp
sched/eevdf: Update se->vprot in reweight_entity()
sched/fair: Only set slice protection at pick time
sched/fair: Fix zero_vruntime tracking
Linus Torvalds [Sun, 1 Mar 2026 19:07:20 +0000 (11:07 -0800)]
Merge tag 'perf-urgent-2026-03-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf events fixes from Ingo Molnar:
- Fix lock ordering bug found by lockdep in perf_event_wakeup()
- Fix uncore counter enumeration on Granite Rapids and Sierra Forest
- Fix perf_mmap() refcount bug found by Syzkaller
- Fix __perf_event_overflow() vs perf_remove_from_context() race
* tag 'perf-urgent-2026-03-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf: Fix __perf_event_overflow() vs perf_remove_from_context() race
perf/core: Fix refcount bug and potential UAF in perf_mmap
perf/x86/intel/uncore: Add per-scheduler IMC CAS count events
perf/core: Fix invalid wait context in ctx_sched_in()
Linus Torvalds [Sun, 1 Mar 2026 19:00:43 +0000 (11:00 -0800)]
Merge tag 'locking-urgent-2026-03-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking fix from Ingo Molnar:
"Now that LLVM 22 has been released officially, require a release
version to use the new CONFIG_WARN_CONTEXT_ANALYSIS feature.
In particular this avoids the widely used Android clang 22.0.1
pre-release build which is known to be broken for this usecase"
* tag 'locking-urgent-2026-03-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
lib/Kconfig.debug: Require a release version of LLVM 22 for context analysis
Linus Torvalds [Sun, 1 Mar 2026 18:58:16 +0000 (10:58 -0800)]
Merge tag 'irq-urgent-2026-03-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irqchip driver fixes from Ingo Molnar:
- Fix frozen interrupt bug in the sifive-plic driver
- Limit per-device MSI interrupts on uncommon gic-v3-its hardware
variants
- Address Sparse warning by constifying a variable in the MMP driver
- Revert broken commit and also fix an error check in the ls-extirq
driver
* tag 'irq-urgent-2026-03-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
irqchip/ls-extirq: Fix devm_of_iomap() error check
Revert "irqchip/ls-extirq: Use for_each_of_imap_item iterator"
irqchip/mmp: Make icu_irq_chip variable static const
irqchip/gic-v3-its: Limit number of per-device MSIs to the range the ITS supports
irqchip/sifive-plic: Fix frozen interrupt due to affinity setting
Linus Torvalds [Sun, 1 Mar 2026 17:59:29 +0000 (09:59 -0800)]
Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Pull SCSI fixes from James Bottomley:
"All changes in drivers (well technically SES is enclosure services,
but its change is minor). The biggest is the write combining change in
lpfc followed by the additional NULL checks in mpi3mr"
* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
scsi: ufs: core: Fix shift out of bounds when MAXQ=32
scsi: ufs: core: Move link recovery for hibern8 exit failure to wl_resume
scsi: ufs: core: Fix possible NULL pointer dereference in ufshcd_add_command_trace()
scsi: snic: MAINTAINERS: Update snic maintainers
scsi: snic: Remove unused linkstatus
scsi: pm8001: Fix use-after-free in pm8001_queue_command()
scsi: mpi3mr: Add NULL checks when resetting request and reply queues
scsi: ufs: core: Reset urgent_bkops_lvl to allow runtime PM power mode
scsi: ses: Fix devices attaching to different hosts
scsi: ufs: core: Fix RPMB region size detection for UFS 2.2
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT
scsi: lpfc: Properly set WC for DPP mapping
Linus Torvalds [Sun, 1 Mar 2026 03:54:28 +0000 (19:54 -0800)]
Merge tag 'bpf-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf
Pull bpf fixes from Alexei Starovoitov:
- Fix alignment of arm64 JIT buffer to prevent atomic tearing (Fuad
Tabba)
- Fix invariant violation for single value tnums in the verifier
(Harishankar Vishwanathan, Paul Chaignon)
- Fix a bunch of issues found by ASAN in selftests/bpf (Ihor Solodrai)
- Fix race in devmpa and cpumap on PREEMPT_RT (Jiayuan Chen)
- Fix show_fdinfo of kprobe_multi when cookies are not present (Jiri
Olsa)
- Fix race in freeing special fields in BPF maps to prevent memory
leaks (Kumar Kartikeya Dwivedi)
- Fix OOB read in dmabuf_collector (T.J. Mercier)
* tag 'bpf-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf: (36 commits)
selftests/bpf: Avoid simplification of crafted bounds test
selftests/bpf: Test refinement of single-value tnum
bpf: Improve bounds when tnum has a single possible value
bpf: Introduce tnum_step to step through tnum's members
bpf: Fix race in devmap on PREEMPT_RT
bpf: Fix race in cpumap on PREEMPT_RT
selftests/bpf: Add tests for special fields races
bpf: Retire rcu_trace_implies_rcu_gp() from local storage
bpf: Delay freeing fields in local storage
bpf: Lose const-ness of map in map_check_btf()
bpf: Register dtor for freeing special fields
selftests/bpf: Fix OOB read in dmabuf_collector
selftests/bpf: Fix a memory leak in xdp_flowtable test
bpf: Fix stack-out-of-bounds write in devmap
bpf: Fix kprobe_multi cookies access in show_fdinfo callback
bpf, arm64: Force 8-byte alignment for JIT buffer to prevent atomic tearing
selftests/bpf: Don't override SIGSEGV handler with ASAN
selftests/bpf: Check BPFTOOL env var in detect_bpftool_path()
selftests/bpf: Fix out-of-bounds array access bugs reported by ASAN
selftests/bpf: Fix array bounds warning in jit_disasm_helpers
...
Linus Torvalds [Sun, 1 Mar 2026 03:35:30 +0000 (19:35 -0800)]
Merge tag 'driver-core-7.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core
Pull driver core fixes from Danilo Krummrich:
- Do not register imx_clk_scu_driver in imx8qxp_clk_probe(); besides
fixing two other issues, this avoids a deadlock in combination with
commit dc23806a7c47 ("driver core: enforce device_lock for
driver_match_device()")
- Move secondary node lookup from device_get_next_child_node() to
fwnode_get_next_child_node(); this avoids issues when users switch
from the device API to the fwnode API
- Export io_define_{read,write}!() to avoid unused import warnings when
CONFIG_PCI=n
* tag 'driver-core-7.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core:
clk: scu/imx8qxp: do not register driver in probe()
rust: io: macro_export io_define_read!() and io_define_write!()
device property: Allow secondary lookup in fwnode_get_next_child_node()
Linus Torvalds [Sat, 28 Feb 2026 18:45:56 +0000 (10:45 -0800)]
Merge tag 'v7.0rc1-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6
Pull smb client fixes from Steve French:
- Two multichannel fixes
- Locking fix for superblock flags
- Fix to remove debug message that could log password
- Cleanup fix for setting credentials
* tag 'v7.0rc1-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
smb: client: Use snprintf in cifs_set_cifscreds
smb: client: Don't log plaintext credentials in cifs_set_cifscreds
smb: client: fix broken multichannel with krb5+signing
smb: client: use atomic_t for mnt_cifs_flags
smb: client: fix cifs_pick_channel when channels are equally loaded
Takashi Sakamoto [Sat, 28 Feb 2026 02:56:03 +0000 (11:56 +0900)]
firewire: ohci: initialize page array to use alloc_pages_bulk() correctly
The call of alloc_pages_bulk() skips to fill entries of page array when
the entries already have values. While, 1394 OHCI PCI driver passes the
page array without initializing. It could cause invalid state at PFN
validation in vmap().
Fixes: f2ae92780ab9 ("firewire: ohci: split page allocation from dma mapping") Reported-by: John Ogness <john.ogness@linutronix.de> Reported-and-tested-by: Harald Arnesen <linux@skogtun.org> Reported-and-tested-by: David Gow <david@davidgow.net> Closes: https://lore.kernel.org/lkml/87tsv1vig5.fsf@jogness.linutronix.de/ Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linus Torvalds [Sat, 28 Feb 2026 17:21:18 +0000 (09:21 -0800)]
Merge tag 'spi-fix-v7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
Pull spi fixes from Mark Brown:
"One fix for the stm32 driver which got broken for DMA chaining cases,
plus a removal of some straggling bindings for the Bikal SoC which has
been pulled out of the kernel"
* tag 'spi-fix-v7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
spi: stm32: fix missing pointer assignment in case of dma chaining
spi: dt-bindings: snps,dw-abp-ssi: Remove unused bindings
Linus Torvalds [Sat, 28 Feb 2026 17:18:02 +0000 (09:18 -0800)]
Merge tag 'regulator-fix-v7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator
Pull regulator fixes from Mark Brown:
"A small pile of fixes, none of which are super major - the code fixes
are improved error handling and fixing a leak of a device node.
We also have a typo fix and an improvement to make the binding example
for mt6359 more directly usable"
* tag 'regulator-fix-v7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator:
regulator: Kconfig: fix a typo
regulator: bq257xx: Fix device node reference leak in bq257xx_reg_dt_parse_gpio()
regulator: fp9931: Fix PM runtime reference leak in fp9931_hwmon_read()
regulator: tps65185: check devm_kzalloc() result in probe
regulator: dt-bindings: mt6359: make regulator names unique
Linus Torvalds [Sat, 28 Feb 2026 17:01:33 +0000 (09:01 -0800)]
Merge tag 's390-7.0-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 fixes from Vasily Gorbik:
- Fix guest pfault init to pass a physical address to DIAG 0x258,
restoring pfault interrupts and avoiding vCPU stalls during host
page-in
- Fix kexec/kdump hangs with stack protector by marking
s390_reset_system() __no_stack_protector; set_prefix(0) switches
lowcore and the canary no longer matches
- Fix idle/vtime cputime accounting (idle-exit ordering, vtimer
double-forwarding) and small cleanups
* tag 's390-7.0-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/pfault: Fix virtual vs physical address confusion
s390/kexec: Disable stack protector in s390_reset_system()
s390/idle: Remove psw_idle() prototype
s390/vtime: Use lockdep_assert_irqs_disabled() instead of BUG_ON()
s390/vtime: Use __this_cpu_read() / get rid of READ_ONCE()
s390/irq/idle: Remove psw bits early
s390/idle: Inline update_timer_idle()
s390/idle: Slightly optimize idle time accounting
s390/idle: Add comment for non obvious code
s390/vtime: Fix virtual timer forwarding
s390/idle: Fix cpu idle exit cpu time accounting
====================
Fix invariant violation for single-value tnums
We're hitting an invariant violation in Cilium that sometimes leads to
BPF programs being rejected and Cilium failing to start [1]. As far as
I know this is the first case of invariant violation found in a real
program (i.e., not by a fuzzer). The following extract from verifier
logs shows what's happening:
More details are given in the second patch, but in short, the verifier
should be able to detect that the false branch of instruction 237 is
never true. After instruction 236, the u64 range and the tnum overlap
in a single value, 0xf00.
The long-term solution to invariant violation is likely to rely on the
refinement + invariant violation check to detect dead branches, as
started by Eduard. To fix the current issue, we need something with
less refactoring that we can backport to affected kernels.
The solution implemented in the second patch is to improve the bounds
refinement to avoid this case. It relies on a new tnum helper,
tnum_step, first sent as an RFC in [2]. The last two patches extend and
update the selftests.
Link: https://github.com/cilium/cilium/issues/44216 Link: https://lore.kernel.org/bpf/20251107192328.2190680-2-harishankar.vishwanathan@gmail.com/
Changes in v3:
- Fix commit description error spotted by AI bot.
- Simplify constants in first two tests (Eduard).
- Rework comment on third test (Eduard).
- Add two new negative test cases (Eduard).
- Rebased.
Changes in v2:
- Add guard suggested by Hari in tnum_step, to avoid undefined
behavior spotted by AI code review.
- Add explanation diagrams in code as suggested by Eduard.
- Rework conditions for readability as suggested by Eduard.
- Updated reference to SMT formula.
- Rebased.
====================
Paul Chaignon [Fri, 27 Feb 2026 21:42:45 +0000 (22:42 +0100)]
selftests/bpf: Avoid simplification of crafted bounds test
The reg_bounds_crafted tests validate the verifier's range analysis
logic. They focus on the actual ranges and thus ignore the tnum. As a
consequence, they carry the assumption that the tested cases can be
reproduced in userspace without using the tnum information.
Unfortunately, the previous change the refinement logic breaks that
assumption for one test case:
The tested bytecode is shown below. Without our previous improvement, on
the false branch of the condition, R7 is only known to have u64 range
[0xfffffffe; 0x100000000]. With our improvement, and using the tnum
information, we can deduce that R7 equals 0x100000000.
R7's tnum is (0; 0x1ffffffff). On the false branch, regs_refine_cond_op
refines R7's u32 range to [0; 0x7fffffff]. Then, __reg32_deduce_bounds
refines the s32 range to 0 using u32 and finally also sets u32=0.
From this, __reg_bound_offset improves the tnum to (0; 0x100000000).
Finally, our previous patch uses this new tnum to deduce that it only
intersect with u64=[0xfffffffe; 0x100000000] in a single value:
0x100000000.
Because the verifier uses the tnum to reach this constant value, the
selftest is unable to reproduce it by only simulating ranges. The
solution implemented in this patch is to change the test case such that
there is more than one overlap value between u64 and the tnum. The max.
u64 value is thus changed from 0x100000000 to 0x300000000.
Paul Chaignon [Fri, 27 Feb 2026 21:36:30 +0000 (22:36 +0100)]
selftests/bpf: Test refinement of single-value tnum
This patch introduces selftests to cover the new bounds refinement
logic introduced in the previous patch. Without the previous patch,
the first two tests fail because of the invariant violation they
trigger. The last test fails because the R10 access is not detected as
dead code. In addition, all three tests fail because of R0 having a
non-constant value in the verifier logs.
In addition, the last two cases are covering the negative cases: when we
shouldn't refine the bounds because the u64 and tnum overlap in at least
two values.
Paul Chaignon [Fri, 27 Feb 2026 21:35:02 +0000 (22:35 +0100)]
bpf: Improve bounds when tnum has a single possible value
We're hitting an invariant violation in Cilium that sometimes leads to
BPF programs being rejected and Cilium failing to start [1]. The
following extract from verifier logs shows what's happening:
We reach instruction 236 with two possible values for R9, 0xe00 and
0xf00. This is perfectly reflected in the tnum, but of course the ranges
are less accurate and cover [0xe00; 0xf00]. Taking the fallthrough path
at instruction 236 allows the verifier to reduce the range to
[0xe01; 0xf00]. The tnum is however not updated.
With these ranges, at instruction 237, the verifier is not able to
deduce that R9 is always equal to 0xf00. Hence the fallthrough pass is
explored first, the verifier refines the bounds using the assumption
that R9 != 0xf00, and ends up with an invariant violation.
This pattern of impossible branch + bounds refinement is common to all
invariant violations seen so far. The long-term solution is likely to
rely on the refinement + invariant violation check to detect dead
branches, as started by Eduard. To fix the current issue, we need
something with less refactoring that we can backport.
This patch uses the tnum_step helper introduced in the previous patch to
detect the above situation. In particular, three cases are now detected
in the bounds refinement:
1. The u64 range and the tnum only overlap in umin.
u64: ---[xxxxxx]-----
tnum: --xx----------x-
2. The u64 range and the tnum only overlap in the maximum value
represented by the tnum, called tmax.
u64: ---[xxxxxx]-----
tnum: xx-----x--------
3. The u64 range and the tnum only overlap in between umin (excluded)
and umax.
u64: ---[xxxxxx]-----
tnum: xx----x-------x-
To detect these three cases, we call tnum_step(tnum, umin), which
returns the smallest member of the tnum greater than umin, called
tnum_next here. We're in case (1) if umin is part of the tnum and
tnum_next is greater than umax. We're in case (2) if umin is not part of
the tnum and tnum_next is equal to tmax. Finally, we're in case (3) if
umin is not part of the tnum, tnum_next is inferior or equal to umax,
and calling tnum_step a second time gives us a value past umax.
This change implements these three cases. With it, the above bytecode
looks as follows:
In addition to the new selftests, this change was also verified with
Agni [3]. For the record, the raw SMT is available at [4]. The property
it verifies is that: If a concrete value x is contained in all input
abstract values, after __update_reg_bounds, it will continue to be
contained in all output abstract values.
bpf: Introduce tnum_step to step through tnum's members
This commit introduces tnum_step(), a function that, when given t, and a
number z returns the smallest member of t larger than z. The number z
must be greater or equal to the smallest member of t and less than the
largest member of t.
The first step is to compute j, a number that keeps all of t's known
bits, and matches all unknown bits to z's bits. Since j is a member of
the t, it is already a candidate for result. However, we want our result
to be (minimally) greater than z.
There are only two possible cases:
(1) Case j <= z. In this case, we want to increase the value of j and
make it > z.
(2) Case j > z. In this case, we want to decrease the value of j while
keeping it > z.
(Case 1.1) Let's first consider the case where j < z. We will address j
== z later.
Since z > j, there had to be a bit position that was 1 in z and a 0 in
j, beyond which all positions of higher significance are equal in j and
z. Further, this position could not have been unknown in a, because the
unknown positions of a match z. This position had to be a 1 in z and
known 0 in t.
Let k be position of the most significant 1-to-0 flip. In our example, k
= 3 (starting the count at 1 at the least significant bit). Setting (to
1) the unknown bits of t in positions of significance smaller than
k will not produce a result > z. Hence, we must set/unset the unknown
bits at positions of significance higher than k. Specifically, we look
for the next larger combination of 1s and 0s to place in those
positions, relative to the combination that exists in z. We can achieve
this by concatenating bits at unknown positions of t into an integer,
adding 1, and writing the bits of that result back into the
corresponding bit positions previously extracted from z.
>From our example, considering only positions of significance greater
than k:
t = xx..x
z = 10..1
+ 1
-----
11..0
This is the exact combination 1s and 0s we need at the unknown bits of t
in positions of significance greater than k. Further, our result must
only increase the value minimally above z. Hence, unknown bits in
positions of significance smaller than k should remain 0. We finally
have,
Matching the unknown bits of the t to the bits of z yielded exactly z.
To produce a number greater than z, we must set/unset the unknown bits
in t, and *all* the unknown bits of t candidates for being set/unset. We
can do this similar to Case 1.1, by adding 1 to the bits extracted from
the masked bit positions of z. Essentially, this case is equivalent to
Case 1.1, with k = 0.
t = 1x1x0xxx
z = .0.1.100
+ 1
---------
.0.1.101
This is the exact combination of bits needed in the unknown positions of
t. After recalling the known positions of t, we get
Since j > z, there had to be a bit position which was 0 in z, and a 1 in
j, beyond which all positions of higher significance are equal in j and
z. This position had to be a 0 in z and known 1 in t. Let k be the
position of the most significant 0-to-1 flip. In our example, k = 4.
Because of the 0-to-1 flip at position k, a member of t can become
greater than z if the bits in positions greater than k are themselves >=
to z. To make that member *minimally* greater than z, the bits in
positions greater than k must be exactly = z. Hence, we simply match all
of t's unknown bits in positions more significant than k to z's bits. In
positions less significant than k, we set all t's unknown bits to 0
to retain minimality.
In our example, in positions of greater significance than k (=4),
t=x000. These positions are matched with z (1000) to produce 1000. In
positions of lower significance than k, t=10x1. All unknown bits are set
to 0 to produce 1001. The final result is:
This concludes the computation for a result > z that is a member of t.
The procedure for tnum_step() in this commit implements the idea
described above. As a proof of correctness, we verified the algorithm
against a logical specification of tnum_step. The specification asserts
the following about the inputs t, z and output res that:
1. res is a member of t, and
2. res is strictly greater than z, and
3. there does not exist another value res2 such that
3a. res2 is also a member of t, and
3b. res2 is greater than z
3c. res2 is smaller than res
We checked the implementation against this logical specification using
an SMT solver. The verification formula in SMTLIB format is available
at [1]. The verification returned an "unsat": indicating that no input
assignment exists for which the implementation and the specification
produce different outputs.
In addition, we also automatically generated the logical encoding of the
C implementation using Agni [2] and verified it against the same
specification. This verification also returned an "unsat", confirming
that the implementation is equivalent to the specification. The formula
for this check is also available at [3].
====================
bpf: Fix per-CPU bulk queue races on PREEMPT_RT
On PREEMPT_RT kernels, local_bh_disable() only calls migrate_disable()
(when PREEMPT_RT_NEEDS_BH_LOCK is not set) and does not disable
preemption. This means CFS scheduling can preempt a task inside the
per-CPU bulk queue (bq) operations in cpumap and devmap, allowing
another task on the same CPU to concurrently access the same bq,
leading to use-after-free, list corruption, and kernel panics.
Patch 1 fixes the cpumap race in bq_flush_to_queue(), originally
reported by syzbot [1].
Patch 2 fixes the same class of race in devmap's bq_xmit_all(),
identified by code inspection after Sebastian Andrzej Siewior pointed
out that devmap has the same per-CPU bulk queue pattern [2].
Both patches use local_lock_nested_bh() to serialize access to the
per-CPU bq. On non-RT this is a pure lockdep annotation with no
overhead; on PREEMPT_RT it provides a per-CPU sleeping lock.
To reproduce the devmap race, insert an mdelay(100) in bq_xmit_all()
after "cnt = bq->count" and before the actual transmit loop. Then pin
two threads to the same CPU, each running BPF_PROG_TEST_RUN with an XDP
program that redirects to a DEVMAP entry (e.g. a veth pair). CFS
timeslicing during the mdelay window causes interleaving. Without the
fix, KASAN reports null-ptr-deref due to operating on freed frames:
BUG: KASAN: null-ptr-deref in __build_skb_around+0x22d/0x340
Write of size 32 at addr 0000000000000d50 by task devmap_race_rep/449
v3 -> v4: https://lore.kernel.org/all/20260213034018.284146-1-jiayuan.chen@linux.dev/
- Move panic trace to cover letter. (Sebastian Andrzej Siewior)
- Add Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> to both patches
from cover letter.
v2 -> v3: https://lore.kernel.org/bpf/20260212023634.366343-1-jiayuan.chen@linux.dev/
- Fix commit message: remove incorrect "spin_lock() becomes rt_mutex"
claim, the per-CPU bq has no spin_lock at all. (Sebastian Andrzej Siewior)
- Fix commit message: accurately describe local_lock_nested_bh()
behavior instead of referencing local_lock(). (Sebastian Andrzej Siewior)
- Remove incomplete discussion of snapshot alternative.
(Sebastian Andrzej Siewior)
- Remove panic trace from commit message. (Sebastian Andrzej Siewior)
- Add patch 2/2 for devmap, same race pattern. (Sebastian Andrzej Siewior)
v1 -> v2: https://lore.kernel.org/bpf/20260211064417.196401-1-jiayuan.chen@linux.dev/
- Use local_lock_nested_bh()/local_unlock_nested_bh() instead of
local_lock()/local_unlock(), since these paths already run under
local_bh_disable(). (Sebastian Andrzej Siewior)
- Replace "Caller must hold bq->bq_lock" comment with
lockdep_assert_held() in bq_flush_to_queue(). (Sebastian Andrzej Siewior)
- Fix Fixes tag to 3253cb49cbad ("softirq: Allow to drop the
softirq-BKL lock on PREEMPT_RT") which is the actual commit that
makes the race possible. (Sebastian Andrzej Siewior)
====================
Jiayuan Chen [Wed, 25 Feb 2026 12:14:56 +0000 (20:14 +0800)]
bpf: Fix race in devmap on PREEMPT_RT
On PREEMPT_RT kernels, the per-CPU xdp_dev_bulk_queue (bq) can be
accessed concurrently by multiple preemptible tasks on the same CPU.
The original code assumes bq_enqueue() and __dev_flush() run atomically
with respect to each other on the same CPU, relying on
local_bh_disable() to prevent preemption. However, on PREEMPT_RT,
local_bh_disable() only calls migrate_disable() (when
PREEMPT_RT_NEEDS_BH_LOCK is not set) and does not disable
preemption, which allows CFS scheduling to preempt a task during
bq_xmit_all(), enabling another task on the same CPU to enter
bq_enqueue() and operate on the same per-CPU bq concurrently.
This leads to several races:
1. Double-free / use-after-free on bq->q[]: bq_xmit_all() snapshots
cnt = bq->count, then iterates bq->q[0..cnt-1] to transmit frames.
If preempted after the snapshot, a second task can call bq_enqueue()
-> bq_xmit_all() on the same bq, transmitting (and freeing) the
same frames. When the first task resumes, it operates on stale
pointers in bq->q[], causing use-after-free.
2. bq->count and bq->q[] corruption: concurrent bq_enqueue() modifying
bq->count and bq->q[] while bq_xmit_all() is reading them.
3. dev_rx/xdp_prog teardown race: __dev_flush() clears bq->dev_rx and
bq->xdp_prog after bq_xmit_all(). If preempted between
bq_xmit_all() return and bq->dev_rx = NULL, a preempting
bq_enqueue() sees dev_rx still set (non-NULL), skips adding bq to
the flush_list, and enqueues a frame. When __dev_flush() resumes,
it clears dev_rx and removes bq from the flush_list, orphaning the
newly enqueued frame.
4. __list_del_clearprev() on flush_node: similar to the cpumap race,
both tasks can call __list_del_clearprev() on the same flush_node,
the second dereferences the prev pointer already set to NULL.
The race between task A (__dev_flush -> bq_xmit_all) and task B
(bq_enqueue -> bq_xmit_all) on the same CPU:
Task A (xdp_do_flush) Task B (ndo_xdp_xmit redirect)
---------------------- --------------------------------
__dev_flush(flush_list)
bq_xmit_all(bq)
cnt = bq->count /* e.g. 16 */
/* start iterating bq->q[] */
<-- CFS preempts Task A -->
bq_enqueue(dev, xdpf)
bq->count == DEV_MAP_BULK_SIZE
bq_xmit_all(bq, 0)
cnt = bq->count /* same 16! */
ndo_xdp_xmit(bq->q[])
/* frames freed by driver */
bq->count = 0
<-- Task A resumes -->
ndo_xdp_xmit(bq->q[])
/* use-after-free: frames already freed! */
Fix this by adding a local_lock_t to xdp_dev_bulk_queue and acquiring
it in bq_enqueue() and __dev_flush(). These paths already run under
local_bh_disable(), so use local_lock_nested_bh() which on non-RT is
a pure annotation with no overhead, and on PREEMPT_RT provides a
per-CPU sleeping lock that serializes access to the bq.
Fixes: 3253cb49cbad ("softirq: Allow to drop the softirq-BKL lock on PREEMPT_RT") Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Jiayuan Chen <jiayuan.chen@shopee.com> Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev> Link: https://lore.kernel.org/r/20260225121459.183121-3-jiayuan.chen@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Jiayuan Chen [Wed, 25 Feb 2026 12:14:55 +0000 (20:14 +0800)]
bpf: Fix race in cpumap on PREEMPT_RT
On PREEMPT_RT kernels, the per-CPU xdp_bulk_queue (bq) can be accessed
concurrently by multiple preemptible tasks on the same CPU.
The original code assumes bq_enqueue() and __cpu_map_flush() run
atomically with respect to each other on the same CPU, relying on
local_bh_disable() to prevent preemption. However, on PREEMPT_RT,
local_bh_disable() only calls migrate_disable() (when
PREEMPT_RT_NEEDS_BH_LOCK is not set) and does not disable
preemption, which allows CFS scheduling to preempt a task during
bq_flush_to_queue(), enabling another task on the same CPU to enter
bq_enqueue() and operate on the same per-CPU bq concurrently.
This leads to several races:
1. Double __list_del_clearprev(): after bq->count is reset in
bq_flush_to_queue(), a preempting task can call bq_enqueue() ->
bq_flush_to_queue() on the same bq when bq->count reaches
CPU_MAP_BULK_SIZE. Both tasks then call __list_del_clearprev()
on the same bq->flush_node, the second call dereferences the
prev pointer that was already set to NULL by the first.
2. bq->count and bq->q[] races: concurrent bq_enqueue() can corrupt
the packet queue while bq_flush_to_queue() is processing it.
The race between task A (__cpu_map_flush -> bq_flush_to_queue) and
task B (bq_enqueue -> bq_flush_to_queue) on the same CPU:
Task A (xdp_do_flush) Task B (cpu_map_enqueue)
---------------------- ------------------------
bq_flush_to_queue(bq)
spin_lock(&q->producer_lock)
/* flush bq->q[] to ptr_ring */
bq->count = 0
spin_unlock(&q->producer_lock)
bq_enqueue(rcpu, xdpf)
<-- CFS preempts Task A --> bq->q[bq->count++] = xdpf
/* ... more enqueues until full ... */
bq_flush_to_queue(bq)
spin_lock(&q->producer_lock)
/* flush to ptr_ring */
spin_unlock(&q->producer_lock)
__list_del_clearprev(flush_node)
/* sets flush_node.prev = NULL */
<-- Task A resumes -->
__list_del_clearprev(flush_node)
flush_node.prev->next = ...
/* prev is NULL -> kernel oops */
Fix this by adding a local_lock_t to xdp_bulk_queue and acquiring it
in bq_enqueue() and __cpu_map_flush(). These paths already run under
local_bh_disable(), so use local_lock_nested_bh() which on non-RT is
a pure annotation with no overhead, and on PREEMPT_RT provides a
per-CPU sleeping lock that serializes access to the bq.
To reproduce, insert an mdelay(100) between bq->count = 0 and
__list_del_clearprev() in bq_flush_to_queue(), then run reproducer
provided by syzkaller.
Fixes: 3253cb49cbad ("softirq: Allow to drop the softirq-BKL lock on PREEMPT_RT") Reported-by: syzbot+2b3391f44313b3983e91@syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/69369331.a70a0220.38f243.009d.GAE@google.com/T/ Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Jiayuan Chen <jiayuan.chen@shopee.com> Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev> Link: https://lore.kernel.org/r/20260225121459.183121-2-jiayuan.chen@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>
====================
Close race in freeing special fields and map value
There exists a race across various map types where the freeing of
special fields (tw, timer, wq, kptr, etc.) can be done eagerly when a
logical delete operation is done on a map value, such that the program
which continues to have access to such a map value can recreate the
fields and cause them to leak.
The set contains fixes for this case. It is a continuation of Mykyta's
previous attempt in [0], but applies to all fields. A test is included
which reproduces the bug reliably in absence of the fixes.
Local Storage Benchmarks
------------------------
Evaluation Setup: Benchmarked on a dual-socket Intel Xeon Gold 6348 (Ice
Lake) @ 2.60GHz (56 cores / 112 threads), with the CPU governor set to
performance. Bench was pinned to a single NUMA node throughout the test.
Benchmark comes from [1] using the following command:
./bench -p 1 local-storage-create --storage-type <socket,task> --batch-size <16,32,64>
Before the test, 10 runs of all cases ([socket|task] x 3 batch sizes x 7
iterations per batch size) are done to warm up and prime the machine.
Then, 3 runs of all cases are done (with and without the patch, across
reboots).
For each comparison, we have 21 samples, i.e. per batch size (e.g.
socket 16) of a given local storage, we have 3 runs x 7 iterations.
The statistics (mean, median, stddev) and t-test is done for each
scenario (local storage and batch size pair) individually (21 samples
for either case). All values are for local storage creations in thousand
creations / sec (k/s).
The cases for socket are within the range of noise, and improvements in task
local storage are due to high variance (CV ~4%-6% across batch sizes). The only
statistically significant case worth mentioning is socket with batch size 64
with p-value from t-test < 0.05, but the absolute difference is small (~2k/s).
TL;DR there doesn't appear to be any significant regression or improvement.
* Add Paul's Reviewed-by.
* Fix use-after-free in accessing bpf_mem_alloc embedded in map. (syzbot CI)
* Add benchmark numbers for local storage.
* Add extra test case for per-cpu hashmap coverage with up to 16 refcount leaks.
* Target bpf tree.
====================
Add a couple of tests to ensure that the refcount drops to zero when we
exercise the race where creation of a special field succeeds the logical
bpf_obj_free_fields done when deleting an element. Prior to previous
changes, the fields would be freed eagerly and repopulate and end up
leaking, causing the reference to not drop down correctly. Running this
test on a kernel without fixes will cause a hang in delete_module, since
the module reference stays active due to the leaked kptr not dropping
it. After the fixes tests succeed as expected.
Currently, when use_kmalloc_nolock is false, the freeing of fields for a
local storage selem is done eagerly before waiting for the RCU or RCU
tasks trace grace period to elapse. This opens up a window where the
program which has access to the selem can recreate the fields after the
freeing of fields is done eagerly, causing memory leaks when the element
is finally freed and returned to the kernel.
Make a few changes to address this. First, delay the freeing of fields
until after the grace periods have expired using a __bpf_selem_free_rcu
wrapper which is eventually invoked after transitioning through the
necessary number of grace period waits. Replace usage of the kfree_rcu
with call_rcu to be able to take a custom callback. Finally, care needs
to be taken to extend the rcu barriers for all cases, and not just when
use_kmalloc_nolock is true, as RCU and RCU tasks trace callbacks can be
in flight for either case and access the smap field, which is used to
obtain the BTF record to walk over special fields in the map value.
While we're at it, drop migrate_disable() from bpf_selem_free_rcu, since
migration should be disabled for RCU callbacks already.
BPF hash map may now use the map_check_btf() callback to decide whether
to set a dtor on its bpf_mem_alloc or not. Unlike C++ where members can
opt out of const-ness using mutable, we must lose the const qualifier on
the callback such that we can avoid the ugly cast. Make the change and
adjust all existing users, and lose the comment in hashtab.c.
There is a race window where BPF hash map elements can leak special
fields if the program with access to the map value recreates these
special fields between the check_and_free_fields done on the map value
and its eventual return to the memory allocator.
Several ways were explored prior to this patch, most notably [0] tried
to use a poison value to reject attempts to recreate special fields for
map values that have been logically deleted but still accessible to BPF
programs (either while sitting in the free list or when reused). While
this approach works well for task work, timers, wq, etc., it is harder
to apply the idea to kptrs, which have a similar race and failure mode.
Instead, we change bpf_mem_alloc to allow registering destructor for
allocated elements, such that when they are returned to the allocator,
any special fields created while they were accessible to programs in the
mean time will be freed. If these values get reused, we do not free the
fields again before handing the element back. The special fields thus
may remain initialized while the map value sits in a free list.
When bpf_mem_alloc is retired in the future, a similar concept can be
introduced to kmalloc_nolock-backed kmem_cache, paired with the existing
idea of a constructor.
Note that the destructor registration happens in map_check_btf, after
the BTF record is populated and (at that point) avaiable for inspection
and duplication. Duplication is necessary since the freeing of embedded
bpf_mem_alloc can be decoupled from actual map lifetime due to logic
introduced to reduce the cost of rcu_barrier()s in mem alloc free path in 9f2c6e96c65e ("bpf: Optimize rcu_barrier usage between hash map and bpf_mem_alloc.").
As such, once all callbacks are done, we must also free the duplicated
record. To remove dependency on the bpf_map itself, also stash the key
size of the map to obtain value from htab_elem long after the map is
gone.
Linus Torvalds [Fri, 27 Feb 2026 21:40:30 +0000 (13:40 -0800)]
Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 fixes from Will Deacon:
"The diffstat is dominated by changes to our TLB invalidation errata
handling and the introduction of a new GCS selftest to catch one of
the issues that is fixed here relating to PROT_NONE mappings.
- Fix cpufreq warning due to attempting a cross-call with interrupts
masked when reading local AMU counters
- Fix DEBUG_PREEMPT warning from the delay loop when it tries to
access per-cpu errata workaround state for the virtual counter
- Re-jig and optimise our TLB invalidation errata workarounds in
preparation for more hardware brokenness
- Fix GCS mappings to interact properly with PROT_NONE and to avoid
corrupting the pte on CPUs with FEAT_LPA2
- Fix ioremap_prot() to extract only the memory attributes from the
user pte and ignore all the other 'prot' bits"
* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
arm64: topology: Fix false warning in counters_read_on_cpu() for same-CPU reads
arm64: Fix sampling the "stable" virtual counter in preemptible section
arm64: tlb: Optimize ARM64_WORKAROUND_REPEAT_TLBI
arm64: tlb: Allow XZR argument to TLBI ops
kselftest: arm64: Check access to GCS after mprotect(PROT_NONE)
arm64: gcs: Honour mprotect(PROT_NONE) on shadow stack mappings
arm64: gcs: Do not set PTE_SHARED on GCS mappings if FEAT_LPA2 is enabled
arm64: io: Extract user memory type in ioremap_prot()
arm64: io: Rename ioremap_prot() to __ioremap_prot()
Linus Torvalds [Fri, 27 Feb 2026 21:32:52 +0000 (13:32 -0800)]
Merge tag 'pci-v7.0-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci
Pull pci fixes from Bjorn Helgaas:
- Update MAINTAINERS email address (Shawn Guo)
- Refresh cached Endpoint driver MSI Message Address to fix a v7.0
regression when kernel changes the address after firmware has
configured it (Niklas Cassel)
- Flush Endpoint MSI-X writes so they complete before the outbound ATU
entry is unmapped (Niklas Cassel)
- Correct the PCI_CAP_EXP_ENDPOINT_SIZEOF_V2 value, which broke VMM use
of PCI capabilities (Bjorn Helgaas)
* tag 'pci-v7.0-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci:
PCI: Correct PCI_CAP_EXP_ENDPOINT_SIZEOF_V2 value
PCI: dwc: ep: Flush MSI-X write before unmapping its ATU entry
PCI: dwc: ep: Refresh MSI Message Address cache on change
MAINTAINERS: Update Shawn Guo's address for HiSilicon PCIe controller driver
Linus Torvalds [Fri, 27 Feb 2026 18:52:57 +0000 (10:52 -0800)]
Merge tag 'cxl-fixes-7.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl
Pull cxl fixes from Dave Jiang:
- Fix incorrect usages of decoder flags
- Validate payload size before accessing contents
- Fix race condition when creating nvdimm objects
- Fix deadlock on attach failure
* tag 'cxl-fixes-7.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl:
cxl/region: Test CXL_DECODER_F_NORMALIZED_ADDRESSING as a bitmask
cxl: Test CXL_DECODER_F_LOCK as a bitmask
cxl/mbox: validate payload size before accessing contents in cxl_payload_from_user_allowed()
cxl: Fix race of nvdimm_bus object when creating nvdimm objects
cxl: Move devm_cxl_add_nvdimm_bridge() to cxl_pmem.ko
cxl/port: Hold port host lock during dport adding.
cxl/port: Introduce port_to_host() helper
cxl/memdev: fix deadlock in cxl_memdev_autoremove() on attach failure
Linus Torvalds [Fri, 27 Feb 2026 18:49:54 +0000 (10:49 -0800)]
Merge tag 'mmc-v7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
Pull MMC fixes from Ulf Hansson:
"MMC core:
- Avoid bitfield RMW for claim/retune flags
MMC host:
- dw_mmc-rockchip: Fix runtime PM support for internal phase support
- mmci: Fix device_node reference leak in of_get_dml_pipe_index()
- sdhci-brcmstb: Use correct register offset for V1 pin_sel restore"
* tag 'mmc-v7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc:
mmc: core: Avoid bitfield RMW for claim/retune flags
mmc: sdhci-brcmstb: use correct register offset for V1 pin_sel restore
mmc: dw_mmc-rockchip: Fix runtime PM support for internal phase support
mmc: mmci: Fix device_node reference leak in of_get_dml_pipe_index()
Linus Torvalds [Fri, 27 Feb 2026 18:42:02 +0000 (10:42 -0800)]
Merge tag 'block-7.0-20260227' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux
Pull block fixes from Jens Axboe:
"Two sets of fixes, one for drbd, and one for the zoned loop driver"
* tag 'block-7.0-20260227' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux:
zloop: check for spurious options passed to remove
zloop: advertise a volatile write cache
drbd: fix null-pointer dereference on local read error
drbd: Replace deprecated strcpy with strscpy
drbd: fix "LOGIC BUG" in drbd_al_begin_io_nonblock()
Linus Torvalds [Fri, 27 Feb 2026 18:39:11 +0000 (10:39 -0800)]
Merge tag 'io_uring-7.0-20260227' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux
Pull io_uring fixes from Jens Axboe:
"Just two minor patches in here, ensuring the use of READ_ONCE() for
sqe field reading is consistent across the codebase. There were two
missing cases, now they are covered too"
* tag 'io_uring-7.0-20260227' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux:
io_uring/timeout: READ_ONCE sqe->addr
io_uring/cmd_net: use READ_ONCE() for ->addr3 read
Linus Torvalds [Fri, 27 Feb 2026 18:21:06 +0000 (10:21 -0800)]
Merge tag 'xfs-fixes-7.0-rc2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Pull xfs fixes from Carlos Maiolino:
"Nothing reeeally stands out here: a few bug fixes, some refactoring to
easily fit the bug fixes, and a couple cosmetic changes"
* tag 'xfs-fixes-7.0-rc2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
xfs: add static size checks for ioctl UABI
xfs: remove duplicate static size checks
xfs: Add comments for usages of some macros.
xfs: Update lazy counters in xfs_growfs_rt_bmblock()
xfs: Add a comment in xfs_log_sb()
xfs: Fix xfs_last_rt_bmblock()
xfs: don't report half-built inodes to fserror
xfs: don't report metadata inodes to fserror
xfs: fix potential pointer access race in xfs_healthmon_get
xfs: fix xfs_group release bug in xfs_dax_notify_dev_failure
xfs: fix xfs_group release bug in xfs_verify_report_losses
xfs: fix copy-paste error in previous fix
xfs: Fix error pointer dereference
xfs: remove metafile inodes from the active inode stat
xfs: cleanup inode counter stats
xfs: fix code alignment issues in xfs_ondisk.c
xfs: Replace &rtg->rtg_group with rtg_group()
xfs: Refactoring the nagcount and delta calculation
xfs: Replace ASSERT with XFS_IS_CORRUPT in xfs_rtcopy_summary()
Linus Torvalds [Fri, 27 Feb 2026 17:54:02 +0000 (09:54 -0800)]
Merge tag 'slab-for-7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab
Pull slab fixes from Vlastimil Babka:
- Fix for spurious page allocation warnings on sheaf refill (Harry Yoo)
- Fix for CONFIG_MEM_ALLOC_PROFILING_DEBUG warnings (Suren
Baghdasaryan)
- Fix for kernel-doc warning on ksize() (Sanjay Chitroda)
- Fix to avoid setting slab->stride later than on slab allocation.
Doesn't yet fix the reports from powerpc; debugging is making
progress (Harry Yoo)
* tag 'slab-for-7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab:
mm/slab: initialize slab->stride early to avoid memory ordering issues
mm/slub: drop duplicate kernel-doc for ksize()
mm/slab: mark alloc tags empty for sheaves allocated with __GFP_NO_OBJ_EXT
mm/slab: pass __GFP_NOWARN to refill_sheaf() if fallback is available
Linus Torvalds [Fri, 27 Feb 2026 17:42:17 +0000 (09:42 -0800)]
Merge tag 'gpio-fixes-for-v7.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux
Pull gpio fixes from Bartosz Golaszewski:
- fix memory leaks in shared GPIO management
- normalize the return values of gpio_chip::get() in GPIO core on
behalf of drivers that return invalid values (this is done because
adding stricter sanitization of callback retvals led to breakages in
existing users, we'll revert that once all are fixed)
* tag 'gpio-fixes-for-v7.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux:
gpiolib: normalize the return value of gc->get() on behalf of buggy drivers
gpio: shared: fix memory leaks
Linus Torvalds [Fri, 27 Feb 2026 17:34:02 +0000 (09:34 -0800)]
Merge tag 'sound-7.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Pull sound fixes from Takashi Iwai:
"A bunch of small device-specific fixes. Mostly quirks and fix-ups for
USB- and HD-audio at this time, in addition to a couple of ASoC AMD
and Cirrus fixes"
* tag 'sound-7.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: (24 commits)
ASoC: SDCA: Fix comments for sdca_irq_request()
ALSA: us144mkii: Drop kernel-doc markers
ALSA: usb: qcom: Correct parameter comment for uaudio_transfer_buffer_setup()
ALSA: usb-audio: Drop superfluous kernel-doc markers
ALSA: hda: cs35l56: Remove unnecessary struct cs_dsp_client_ops
ALSA: hda: cs35l56: Fix signedness error in cs35l56_hda_posture_put()
ALSA: usb-audio: Use correct version for UAC3 header validation
ALSA: hda/realtek: add quirk for Acer Nitro ANV15-51
ALSA: hda/intel: increase default bdl_pos_adj for Nvidia controllers
ALSA: usb-audio: Use inclusive terms
ALSA: usb-audio: Avoid implicit feedback mode on DIYINHK USB Audio 2.0
ALSA: usb-audio: Check max frame size for implicit feedback mode, too
ALSA: usb-audio: Cap the packet size pre-calculations
ASoC: amd: yc: Add ASUS EXPERTBOOK BM1503CDA to quirk table
ASoC: cs42l43: Report insert for exotic peripherals
ALSA: usb-audio: Skip clock selector for Focusrite devices
ALSA: usb-audio: Add QUIRK_FLAG_SKIP_IFACE_SETUP
ALSA: usb-audio: Remove VALIDATE_RATES quirk for Focusrite devices
ALSA: usb-audio: Improve Focusrite sample rate filtering
ALSA: hda/realtek: add quirk for Samsung Galaxy Book Flex (NT950QCT-A38A)
...
Linus Torvalds [Fri, 27 Feb 2026 16:56:07 +0000 (08:56 -0800)]
Merge tag 'drm-fixes-2026-02-27' of https://gitlab.freedesktop.org/drm/kernel
Pull drm fixes from Dave Airlie:
"Regular fixes pull, amdxdna and amdgpu are the main ones, with a
couple of intel fixes, then a scattering of fixes across drivers,
nothing too major.
i915/display:
- Fix Panel Replay stuck with X during mode transitions on Panther
Lake
vmwgfx:
- A reference count and error handling fix"
* tag 'drm-fixes-2026-02-27' of https://gitlab.freedesktop.org/drm/kernel: (39 commits)
drm/amd: Disable MES LR compute W/A
drm/amdgpu: Fix error handling in slot reset
drm/amdgpu/vcn5: Add SMU dpm interface type
drm/amdgpu: Fix locking bugs in error paths
drm/amdgpu: Unlock a mutex before destroying it
drm/amd/display: Use GFP_ATOMIC in dc_create_stream_for_sink
drm/amdgpu: add upper bound check on user inputs in wait ioctl
drm/amdgpu: add upper bound check on user inputs in signal ioctl
drm/amdgpu/userq: Do not allow userspace to trivially triger kernel warnings
drm/amdgpu/userq: Fix reference leak in amdgpu_userq_wait_ioctl
accel/amdxdna: Use a different name for latest firmware
drm/client: Do not destroy NULL modes
drm/gpusvm: Fix drm_gpusvm_pages_valid_unlocked() kernel-doc
drm/xe/sync: Fix user fence leak on alloc failure
drm/xe/sync: Cleanup partially initialized sync on parse failure
drm/xe/wa: Steer RMW of MCR registers while building default LRC
accel/amdxdna: Validate command buffer payload count
accel/amdxdna: Prevent ubuf size overflow
accel/amdxdna: Fix out-of-bounds memset in command slot handling
accel/amdxdna: Fix command hang on suspended hardware context
...
Bjorn Helgaas [Fri, 27 Feb 2026 12:10:08 +0000 (06:10 -0600)]
PCI: Correct PCI_CAP_EXP_ENDPOINT_SIZEOF_V2 value
fb82437fdd8c ("PCI: Change capability register offsets to hex") incorrectly
converted the PCI_CAP_EXP_ENDPOINT_SIZEOF_V2 value from decimal 52 to hex
0x32:
-#define PCI_CAP_EXP_ENDPOINT_SIZEOF_V2 52 /* v2 endpoints with link end here */
+#define PCI_CAP_EXP_ENDPOINT_SIZEOF_V2 0x32 /* end of v2 EPs w/ link */
This broke PCI capabilities in a VMM because subsequent ones weren't
DWORD-aligned.
Change PCI_CAP_EXP_ENDPOINT_SIZEOF_V2 to the correct value of 0x34.
fb82437fdd8c was from Baruch Siach <baruch@tkos.co.il>, but this was not
Baruch's fault; it's a mistake I made when applying the patch.
Fixes: fb82437fdd8c ("PCI: Change capability register offsets to hex") Reported-by: David Woodhouse <dwmw2@infradead.org> Closes: https://lore.kernel.org/all/3ae392a0158e9d9ab09a1d42150429dd8ca42791.camel@infradead.org Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Thorsten Blum [Thu, 26 Feb 2026 22:15:22 +0000 (23:15 +0100)]
smb: client: Use snprintf in cifs_set_cifscreds
Replace unbounded sprintf() calls with the safer snprintf(). Avoid using
magic numbers and use strlen() to calculate the key descriptor buffer
size. Save the size in a local variable and reuse it for the bounded
snprintf() calls. Remove CIFSCREDS_DESC_SIZE.
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev> Acked-by: Paulo Alcantara (Red Hat) <pc@manguebit.org> Signed-off-by: Steve French <stfrench@microsoft.com>
Harry Yoo [Mon, 23 Feb 2026 07:58:09 +0000 (16:58 +0900)]
mm/slab: initialize slab->stride early to avoid memory ordering issues
When alloc_slab_obj_exts() is called later (instead of during slab
allocation and initialization), slab->stride and slab->obj_exts are
updated after the slab is already accessible by multiple CPUs.
The current implementation does not enforce memory ordering between
slab->stride and slab->obj_exts. For correctness, slab->stride must be
visible before slab->obj_exts. Otherwise, concurrent readers may observe
slab->obj_exts as non-zero while stride is still stale.
With stale slab->stride, slab_obj_ext() could return the wrong obj_ext.
This could cause two problems:
- obj_cgroup_put() is called on the wrong objcg, leading to
a use-after-free due to incorrect reference counting [1] by
decrementing the reference count more than it was incremented.
- refill_obj_stock() is called on the wrong objcg, leading to
a page_counter overflow [2] by uncharging more memory than charged.
Fix this by unconditionally initializing slab->stride in
alloc_slab_obj_exts_early(), before the need_slab_obj_exts() check.
In the case of SLAB_OBJ_EXT_IN_OBJ, it is overridden in the function.
This ensures updates to slab->stride become visible before the slab
can be accessed by other CPUs via the per-node partial slab list
(protected by spinlock with acquire/release semantics).
Thanks to Shakeel Butt for pointing out this issue [3].
[vbabka@kernel.org: the bug reports [1] and [2] are not yet fully fixed,
with investigation ongoing, but it is nevertheless a step in the right
direction to only set stride once after allocating the slab and not
change it later ]
docs: media: document media multi-committers rules and process
As the media subsystem will experiment with a multi-committers model,
update the Maintainer's entry profile to the new rules, and add a file
documenting the process to become a committer and to maintain such
rights.
Reviewed-by: Ricardo Ribalda <ribalda@chromium.org> Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
Thorsten Blum [Thu, 26 Feb 2026 21:28:45 +0000 (22:28 +0100)]
smb: client: Don't log plaintext credentials in cifs_set_cifscreds
When debug logging is enabled, cifs_set_cifscreds() logs the key
payload and exposes the plaintext username and password. Remove the
debug log to avoid exposing credentials.
Fixes: 8a8798a5ff90 ("cifs: fetch credentials out of keyring for non-krb5 auth multiuser mounts") Cc: stable@vger.kernel.org Acked-by: Paulo Alcantara (Red Hat) <pc@manguebit.org> Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev> Signed-off-by: Steve French <stfrench@microsoft.com>
Paulo Alcantara [Thu, 26 Feb 2026 00:34:55 +0000 (21:34 -0300)]
smb: client: fix broken multichannel with krb5+signing
When mounting a share with 'multichannel,max_channels=n,sec=krb5i',
the client was duplicating signing key for all secondary channels,
thus making the server fail all commands sent from secondary channels
due to bad signatures.
Every channel has its own signing key, so when establishing a new
channel with krb5 auth, make sure to use the new session key as the
derived key to generate channel's signing key in SMB2_auth_kerberos().
Paulo Alcantara [Mon, 23 Feb 2026 16:34:35 +0000 (13:34 -0300)]
smb: client: use atomic_t for mnt_cifs_flags
Use atomic_t for cifs_sb_info::mnt_cifs_flags as it's currently
accessed locklessly and may be changed concurrently in mount/remount
and reconnect paths.
Signed-off-by: Paulo Alcantara (Red Hat) <pc@manguebit.org> Reviewed-by: David Howells <dhowells@redhat.com> Cc: linux-cifs@vger.kernel.org Signed-off-by: Steve French <stfrench@microsoft.com>
Linus Torvalds [Fri, 27 Feb 2026 00:01:18 +0000 (16:01 -0800)]
Merge tag 'v7.0-rc1-ksmbd-server-fixes' of git://git.samba.org/ksmbd
Pull smb server fixes from Steve French:
- auth security improvement
- fix potential buffer overflow in smbdirect negotiation
* tag 'v7.0-rc1-ksmbd-server-fixes' of git://git.samba.org/ksmbd:
ksmbd: fix signededness bug in smb_direct_prepare_negotiation()
ksmbd: Compare MACs in constant time
Linus Torvalds [Thu, 26 Feb 2026 23:27:41 +0000 (15:27 -0800)]
Merge tag 'mm-hotfixes-stable-2026-02-26-14-14' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull misc fixes from Andrew Morton:
"12 hotfixes. 7 are cc:stable. 8 are for MM.
All are singletons - please see the changelogs for details"
* tag 'mm-hotfixes-stable-2026-02-26-14-14' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
MAINTAINERS: update Yosry Ahmed's email address
mailmap: add entry for Daniele Alessandrelli
mm: fix NULL NODE_DATA dereference for memoryless nodes on boot
mm/tracing: rss_stat: ensure curr is false from kthread context
mm/kfence: fix KASAN hardware tag faults during late enablement
mm/damon/core: disallow non-power of two min_region_sz
Squashfs: check metadata block offset is within range
MAINTAINERS, mailmap: update e-mail address for Vlastimil Babka
liveupdate: luo_file: remember retrieve() status
mm: thp: deny THP for files on anonymous inodes
mm: change vma_alloc_folio_noprof() macro to inline function
mm/kfence: disable KFENCE upon KASAN HW tags enablement
Linus Torvalds [Thu, 26 Feb 2026 23:19:16 +0000 (15:19 -0800)]
Merge tag 'dma-mapping-7.0-2026-02-26' of git://git.kernel.org/pub/scm/linux/kernel/git/mszyprowski/linux
Pull dma-mapping fixes from Marek Szyprowski:
"Two DMA-mapping fixes for the recently merged API rework (Jiri Pirko
and Stian Halseth)"
* tag 'dma-mapping-7.0-2026-02-26' of git://git.kernel.org/pub/scm/linux/kernel/git/mszyprowski/linux:
sparc: Fix page alignment in dma mapping
dma-mapping: avoid random addr value print out on error path
Alain Volmat [Tue, 24 Feb 2026 15:09:22 +0000 (16:09 +0100)]
spi: stm32: fix missing pointer assignment in case of dma chaining
Commit c4f2c05ab029 ("spi: stm32: fix pointer-to-pointer variables usage")
introduced a regression since dma descriptors generated as part of the
stm32_spi_prepare_rx_dma_mdma_chaining function are not well propagated
to the caller function, leading to mdma-dma chaining being no more
functional.
Linus Torvalds [Thu, 26 Feb 2026 22:45:29 +0000 (14:45 -0800)]
Merge tag 'acpi-7.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI fixes from Rafael Wysocki:
"New platform quirks for two systems:
- Add a quirk for Lenovo G70-35 to save the ACPI NVS memory on system
suspend (Piotr Mazek)
- Add a DMI quirk for Acer Aspire One D255 to work around a backlight
issue by returning false to _OSI("Windows 2009") (Sofia Schneider)"
* tag 'acpi-7.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
ACPI: OSI: Add DMI quirk for Acer Aspire One D255
ACPI: PM: Save NVS memory on Lenovo G70-35
Linus Torvalds [Thu, 26 Feb 2026 22:40:21 +0000 (14:40 -0800)]
Merge tag 'pm-7.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull power management fixes from Rafael Wysocki:
"These fix two intel_pstate driver issues causing it to crash on sysfs
attribute accesses when some CPUs in the system are offline, finalize
changes related to turning pm_runtime_put() into a void function, and
update Daniel Lezcano's contact information:
- Fix two issues in the intel_pstate driver causing it to crash when
its sysfs interface is used on a system with some offline CPUs
(David Arcari, Srinivas Pandruvada)
- Update the last user of the pm_runtime_put() return value to
discard it and turn pm_runtime_put() into a void function (Rafael
Wysocki)
- Update Daniel Lezcano's contact information in MAINTAINERS and
.mailmap (Daniel Lezcano)"
* tag 'pm-7.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
MAINTAINERS: Update contact with the kernel.org address
cpufreq: intel_pstate: Fix crash during turbo disable
cpufreq: intel_pstate: Fix NULL pointer dereference in update_cpu_qos_request()
PM: runtime: Change pm_runtime_put() return type to void
pmdomain: imx: gpcv2: Discard pm_runtime_put() return value
Linus Torvalds [Thu, 26 Feb 2026 22:34:21 +0000 (14:34 -0800)]
Merge tag 'for-linus-7.0-1' of https://github.com/cminyard/linux-ipmi
Pull IPMI driver fixes from Corey Minyard:
"This mostly revolves around getting the driver to behave when the IPMI
device misbehaves. Past attempts have not worked very well because I
didn't have hardware I could make do this, and AI was fairly useless
for help on this.
So I modified qemu and my test suite so I could reproduce a
misbehaving IPMI device, and with that I was able to fix the issues"
* tag 'for-linus-7.0-1' of https://github.com/cminyard/linux-ipmi:
ipmi:si: Fix check for a misbehaving BMC
ipmi:msghandler: Handle error returns from the SMI sender
ipmi:si: Don't block module unload if the BMC is messed up
ipmi:si: Use a long timeout when the BMC is misbehaving
ipmi:si: Handle waiting messages when BMC failure detected
ipmi:ls2k: Make ipmi_ls2k_platform_driver static
ipmi: ipmb: initialise event handler read bytes
ipmi: Consolidate the run to completion checking for xmit msgs lock
ipmi: Fix use-after-free and list corruption on sender error
- Fix two issues in the intel_pstate driver causing it to crash when
its sysfs interface is used on a system with some offline CPUs (David
Arcari, Srinivas Pandruvada)
- Update the last user of the pm_runtime_put() return value to discard
it and turn pm_runtime_put() into a void function (Rafael Wysocki)
* pm-cpufreq:
cpufreq: intel_pstate: Fix crash during turbo disable
cpufreq: intel_pstate: Fix NULL pointer dereference in update_cpu_qos_request()
* pm-runtime:
PM: runtime: Change pm_runtime_put() return type to void
pmdomain: imx: gpcv2: Discard pm_runtime_put() return value
Dave Airlie [Thu, 26 Feb 2026 19:49:05 +0000 (05:49 +1000)]
Merge tag 'drm-misc-fixes-2026-02-26' of https://gitlab.freedesktop.org/drm/misc/kernel into drm-fixes
Several fixes for:
- amdxdna: Fix for a deadlock, a NULL pointer dereference, a suspend
failure, a hang, an out-of-bounds access, a buffer overflow, input
sanitization and other minor fixes.
- dw-dp: An error handling fix
- ethosu: A binary shift overflow fix
- imx: An error handling fix
- logicvc: A dt node reference leak fix
- nouveau: A WARN_ON removal
- samsung-dsim: A memory leak fix
- sharp-memory: A NULL pointer dereference fix
- vmgfx: A reference count and error handling fix
T.J. Mercier [Wed, 25 Feb 2026 00:33:48 +0000 (16:33 -0800)]
selftests/bpf: Fix OOB read in dmabuf_collector
Dmabuf name allocations can be less than DMA_BUF_NAME_LEN characters,
but bpf_probe_read_kernel always tries to read exactly that many bytes.
If a name is less than DMA_BUF_NAME_LEN characters,
bpf_probe_read_kernel will read past the end. bpf_probe_read_kernel_str
stops at the first NUL terminator so use it instead, like
iter_dmabuf_for_each already does.
Fixes: ae5d2c59ecd7 ("selftests/bpf: Add test for dmabuf_iter") Reported-by: Jerome Lee <jaewookl@quicinc.com> Signed-off-by: T.J. Mercier <tjmercier@google.com> Link: https://lore.kernel.org/r/20260225003349.113746-1-tjmercier@google.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Direct leak of 32 byte(s) in 1 object(s) allocated from:
#0 0x7f1ff3cfa340 in calloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:77
#1 0x5610c15bb520 in bpf_program_attach_fd /codebuild/output/src685977285/src/actions-runner/_work/vmtest/vmtest/src/tools/lib/bpf/libbpf.c:13164
#2 0x5610c15bb740 in bpf_program__attach_xdp /codebuild/output/src685977285/src/actions-runner/_work/vmtest/vmtest/src/tools/lib/bpf/libbpf.c:13204
#3 0x5610c14f91d3 in test_xdp_flowtable /codebuild/output/src685977285/src/actions-runner/_work/vmtest/vmtest/src/tools/testing/selftests/bpf/prog_tests/xdp_flowtable.c:138
#4 0x5610c1533566 in run_one_test /codebuild/output/src685977285/src/actions-runner/_work/vmtest/vmtest/src/tools/testing/selftests/bpf/test_progs.c:1406
#5 0x5610c1537fb0 in main /codebuild/output/src685977285/src/actions-runner/_work/vmtest/vmtest/src/tools/testing/selftests/bpf/test_progs.c:2097
#6 0x7f1ff25df1c9 (/lib/x86_64-linux-gnu/libc.so.6+0x2a1c9) (BuildId: 8e9fd827446c24067541ac5390e6f527fb5947bb)
#7 0x7f1ff25df28a in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2a28a) (BuildId: 8e9fd827446c24067541ac5390e6f527fb5947bb)
#8 0x5610c0bd3180 in _start (/tmp/work/vmtest/vmtest/selftests/bpf/test_progs+0x593180) (BuildId: cdf9f103f42307dc0a2cd6cfc8afcbc1366cf8bd)
Fix by properly destroying bpf_link on exit in xdp_flowtable test.
Kohei Enju [Wed, 25 Feb 2026 05:34:44 +0000 (05:34 +0000)]
bpf: Fix stack-out-of-bounds write in devmap
get_upper_ifindexes() iterates over all upper devices and writes their
indices into an array without checking bounds.
Also the callers assume that the max number of upper devices is
MAX_NEST_DEV and allocate excluded_devices[1+MAX_NEST_DEV] on the stack,
but that assumption is not correct and the number of upper devices could
be larger than MAX_NEST_DEV (e.g., many macvlans), causing a
stack-out-of-bounds write.
Add a max parameter to get_upper_ifindexes() to avoid the issue.
When there are too many upper devices, return -EOVERFLOW and abort the
redirect.
To reproduce, create more than MAX_NEST_DEV(8) macvlans on a device with
an XDP program attached using BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS.
Then send a packet to the device to trigger the XDP redirect path.
projects / thirdparty / kernel / linux.git / log
