If we finds a vq without a name in our input array in
virtio_ccw_find_vqs(), we treat it as "non-existing" and set the vq pointer
to NULL; we will not call virtio_ccw_setup_vq() to allocate/setup a vq.
Consequently, we create only a queue if it actually exists (name != NULL)
and assign an incremental queue index to each such existing queue.
However, in virtio_ccw_register_adapter_ind()->get_airq_indicator() we
will not ignore these "non-existing queues", but instead assign an airq
indicator to them.
Besides never releasing them in virtio_ccw_drop_indicators() (because
there is no virtqueue), the bigger issue seems to be that there will be a
disagreement between the device and the Linux guest about the airq
indicator to be used for notifying a queue, because the indicator bit
for adapter I/O interrupt is derived from the queue index.
The virtio spec states under "Setting Up Two-Stage Queue Indicators":
... indicator contains the guest address of an area wherein the
indicators for the devices are contained, starting at bit_nr, one
bit per virtqueue of the device.
And further in "Notification via Adapter I/O Interrupts":
For notifying the driver of virtqueue buffers, the device sets the
bit in the guest-provided indicator area at the corresponding
offset.
For example, QEMU uses in virtio_ccw_notify() the queue index (passed as
"vector") to select the relevant indicator bit. If a queue does not exist,
it does not have a corresponding indicator bit assigned, because it
effectively doesn't have a queue index.
Using a virtio-balloon-ccw device under QEMU with free-page-hinting
disabled ("free-page-hint=off") but free-page-reporting enabled
("free-page-reporting=on") will result in free page reporting
not working as expected: in the virtio_balloon driver, we'll be stuck
forever in virtballoon_free_page_report()->wait_event(), because the
waitqueue will not be woken up as the notification from the device is
lost: it would use the wrong indicator bit.
Free page reporting stops working and we get splats (when configured to
detect hung wqs) like:
INFO: task kworker/1:3:463 blocked for more than 61 seconds.
Not tainted 6.14.0 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:3 [...]
Workqueue: events page_reporting_process
Call Trace:
[<000002f404e6dfb2>] __schedule+0x402/0x1640
[<000002f404e6f22e>] schedule+0x3e/0xe0
[<000002f3846a88fa>] virtballoon_free_page_report+0xaa/0x110 [virtio_balloon]
[<000002f40435c8a4>] page_reporting_process+0x2e4/0x740
[<000002f403fd3ee2>] process_one_work+0x1c2/0x400
[<000002f403fd4b96>] worker_thread+0x296/0x420
[<000002f403fe10b4>] kthread+0x124/0x290
[<000002f403f4e0dc>] __ret_from_fork+0x3c/0x60
[<000002f404e77272>] ret_from_fork+0xa/0x38
There was recently a discussion [1] whether the "holes" should be
treated differently again, effectively assigning also non-existing
queues a queue index: that should also fix the issue, but requires other
workarounds to not break existing setups.
Let's fix it without affecting existing setups for now by properly ignoring
the non-existing queues, so the indicator bits will match the queue
indexes.
[1] https://lore.kernel.org/all/cover.1720611677.git.mst@redhat.com/
Fixes: a229989d97 ("virtio: don't allocate vqs when names[i] = NULL")
Reported-by: Chandra Merla <cmerla@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: David Hildenbrand <david@redhat.com>
Tested-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Link: https://lore.kernel.org/r/20250402203621.940090-1-david@redhat.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Since
741c10b096 ("kernfs: Use RCU to access kernfs_node::name.")
a helper rdt_kn_name() that checks that rdtgroup_mutex is held has been used
for all accesses to the kernfs node name.
rdtgroup_mkdir() uses the name to determine if a valid monitor group is being
created by checking the parent name is "mon_groups". This is done without
holding rdtgroup_mutex, and now triggers the following warning:
| WARNING: suspicious RCU usage
| 6.15.0-rc1 #4465 Tainted: G E
| -----------------------------
| arch/x86/kernel/cpu/resctrl/internal.h:408 suspicious rcu_dereference_check() usage!
[...]
| Call Trace:
| <TASK>
| dump_stack_lvl
| lockdep_rcu_suspicious.cold
| is_mon_groups
| rdtgroup_mkdir
| kernfs_iop_mkdir
| vfs_mkdir
| do_mkdirat
| __x64_sys_mkdir
| do_syscall_64
| entry_SYSCALL_64_after_hwframe
Creating a control or monitor group calls mkdir_rdt_prepare(), which uses
rdtgroup_kn_lock_live() to take the rdtgroup_mutex.
To avoid taking and dropping the lock, move the check for the monitor group
name and position into mkdir_rdt_prepare() so that it occurs under
rdtgroup_mutex. Hoist is_mon_groups() earlier in the file.
[ bp: Massage. ]
Fixes: 741c10b096 ("kernfs: Use RCU to access kernfs_node::name.")
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20250407124637.2433230-1-james.morse@arm.com
Commit 1be52169c3 ("nvme-tcp: fix selinux denied when calling
sock_sendmsg") converted sock_create() in nvme_tcp_alloc_queue()
to sock_create_kern().
sock_create_kern() creates a kernel socket, which does not hold
a reference to netns. If the code does not manage the netns
lifetime properly, use-after-free could happen.
Also, TCP kernel socket with sk_net_refcnt 0 has a socket leak
problem: it remains FIN_WAIT_1 if it misses FIN after close()
because tcp_close() stops all timers.
To fix such problems, let's hold netns ref by sk_net_refcnt_upgrade().
We had the same issue in CIFS, SMC, etc, and applied the same
solution, see commit ef7134c7fc ("smb: client: Fix use-after-free
of network namespace.") and commit 9744d2bf19 ("smc: Fix
use-after-free in tcp_write_timer_handler().").
Fixes: 1be52169c3 ("nvme-tcp: fix selinux denied when calling sock_sendmsg")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
The function pdc20621_prog_dimm0() calls the function pdc20621_i2c_read()
but does not handle the error if the read fails. This could lead to
process with invalid data. A proper implementation can be found in
/source/drivers/ata/sata_sx4.c, pdc20621_prog_dimm_global(). As mentioned
in its commit: bb44e154e2, the variable spd0
might be used uninitialized when pdc20621_i2c_read() fails.
Add error handling to pdc20621_i2c_read(). If a read operation fails,
an error message is logged via dev_err(), and return a negative error
code.
Add error handling to pdc20621_prog_dimm0() in pdc20621_dimm_init(), and
return a negative error code if pdc20621_prog_dimm0() fails.
Fixes: 4447d35156 ("libata: convert the remaining SATA drivers to new init model")
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Pull kunit fixes from Shuah Khan:
- Fix the tool to report test count in case of a late test plan when
tests are specified before the test plan
- Fix spelling error
* tag 'linux_kselftest-kunit-6.15-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
kunit: Spelling s/slowm/slow/
kunit: tool: fix count of tests if late test plan
MS-FSCC in section 2.1.2.7 LX SYMLINK REPARSE_DATA_BUFFER now contains
documentation about WSL symlink reparse point buffers.
https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-fscc/68337353-9153-4ee1-ac6b-419839c3b7ad
Fix the struct reparse_wsl_symlink_data_buffer to reflect buffer fields
according to the MS-FSCC documentation.
Fix the Linux SMB client to correctly fill the WSL symlink reparse point
buffer when creaing new WSL-style symlink. There was a mistake during
filling the data part of the reparse point buffer. It should starts with
bytes "\x02\x00\x00\x00" (which represents version 2) but this constant was
written as number 0x02000000 encoded in little endian, which resulted bytes
"\x00\x00\x00\x02". This change is fixing this mistake.
Fixes: 4e2043be5c ("cifs: Add support for creating WSL-style symlinks")
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
page_pool_dev_alloc_pages could return NULL. There was a WARN_ON(!page)
but it would still proceed to use the NULL pointer and then crash.
This is similar to commit 001ba09020
("net: fec: handle page_pool_dev_alloc_pages error").
This is found by our static analysis tool KNighter.
Signed-off-by: Chenyuan Yang <chenyuan0y@gmail.com>
Fixes: 3c47e8ae11 ("net: libwx: Support to receive packets in NAPI")
Reviewed-by: Joe Damato <jdamato@fastly.com>
Link: https://patch.msgid.link/20250407184952.2111299-1-chenyuan0y@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Matthieu Baerts says:
====================
mptcp: only inc MPJoinAckHMacFailure for HMAC failures
Recently, during a debugging session using local MPTCP connections, I
noticed MPJoinAckHMacFailure was strangely not zero on the server side.
The first patch fixes this issue -- present since v5.9 -- and the second
one validates it in the selftests.
====================
Link: https://patch.msgid.link/20250407-net-mptcp-hmac-failure-mib-v1-0-3c9ecd0a3a50@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Recently, during a debugging session using local MPTCP connections, I
noticed MPJoinAckHMacFailure was not zero on the server side. The
counter was in fact incremented when the PM rejected new subflows,
because the 'subflow' limit was reached.
The fix is easy, simply dissociating the two cases: only the HMAC
validation check should increase MPTCP_MIB_JOINACKMAC counter.
Fixes: 4cf8b7e48a ("subflow: introduce and use mptcp_can_accept_new_subflow()")
Cc: stable@vger.kernel.org
Reviewed-by: Geliang Tang <geliang@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250407-net-mptcp-hmac-failure-mib-v1-1-3c9ecd0a3a50@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
When running the mincore_selftest on a system with an XFS file system, it
failed the "check_file_mmap" test case due to the read-ahead pages reaching
the end of the file. The failure log is as below:
RUN global.check_file_mmap ...
mincore_selftest.c:264:check_file_mmap:Expected i (1024) < vec_size (1024)
mincore_selftest.c:265:check_file_mmap:Read-ahead pages reached the end of the file
check_file_mmap: Test failed
FAIL global.check_file_mmap
This is because the read-ahead window size of the XFS file system on this
machine is 4 MB, which is larger than the size from the #PF address to the
end of the file. As a result, all the pages for this file are populated.
blockdev --getra /dev/nvme0n1p5
8192
blockdev --getbsz /dev/nvme0n1p5
512
This issue can be fixed by extending the current FILE_SIZE 4MB to a larger
number, but it will still fail if the read-ahead window size of the file
system is larger enough. Additionally, in the real world, read-ahead pages
reaching the end of the file can happen and is an expected behavior.
Therefore, allowing read-ahead pages to reach the end of the file is a
better choice for the "check_file_mmap" test case.
Link: https://lore.kernel.org/r/20250311080940.21413-1-qiuxu.zhuo@intel.com
Reported-by: Yi Lai <yi1.lai@intel.com>
Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Use POSIX-conformant expression operator symbol '='.
The use of the non POSIX-conformant symbol '==' would work
in bash, but not in sh where the unexpected operator error
would result in test_smoke.sh being skipped.
Instead of changing the shebang to use bash, which may not be
available on all systems, use the POSIX-conformant expression
symbol '=' to test for equality.
Without this patch:
===================
# make -j8 TARGETS=tpm2 kselftest
# selftests: tpm2: test_smoke.sh
# ./test_smoke.sh: 9: [: 2: unexpected operator
ok 1 selftests: tpm2: test_smoke.sh # SKIP
With this patch:
================
# make -j8 TARGETS=tpm2 kselftest
# selftests: tpm2: test_smoke.sh
# Ran 9 tests in 9.236s
ok 1 selftests: tpm2: test_smoke.sh
Link: https://lore.kernel.org/r/37ztyakgrrtgvec344mg7mspchwjpxxtsprtjidso3pwkmm4f4@awsa5mzgqmtb
Signed-off-by: Ahmed Salem <x0rw3ll@gmail.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Pull kvm fixes from Paolo Bonzini:
"ARM:
- Rework heuristics for resolving the fault IPA (HPFAR_EL2 v. re-walk
stage-1 page tables) to align with the architecture. This avoids
possibly taking an SEA at EL2 on the page table walk or using an
architecturally UNKNOWN fault IPA
- Use acquire/release semantics in the KVM FF-A proxy to avoid
reading a stale value for the FF-A version
- Fix KVM guest driver to match PV CPUID hypercall ABI
- Use Inner Shareable Normal Write-Back mappings at stage-1 in KVM
selftests, which is the only memory type for which atomic
instructions are architecturally guaranteed to work
s390:
- Don't use %pK for debug printing and tracepoints
x86:
- Use a separate subclass when acquiring KVM's per-CPU posted
interrupts wakeup lock in the scheduled out path, i.e. when adding
a vCPU on the list of vCPUs to wake, to workaround a false positive
deadlock. The schedule out code runs with a scheduler lock that the
wakeup handler takes in the opposite order; but it does so with
IRQs disabled and cannot run concurrently with a wakeup
- Explicitly zero-initialize on-stack CPUID unions
- Allow building irqbypass.ko as as module when kvm.ko is a module
- Wrap relatively expensive sanity check with KVM_PROVE_MMU
- Acquire SRCU in KVM_GET_MP_STATE to protect guest memory accesses
selftests:
- Add more scenarios to the MONITOR/MWAIT test
- Add option to rseq test to override /dev/cpu_dma_latency
- Bring list of exit reasons up to date
- Cleanup Makefile to list once tests that are valid on all
architectures
Other:
- Documentation fixes"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (26 commits)
KVM: arm64: Use acquire/release to communicate FF-A version negotiation
KVM: arm64: selftests: Explicitly set the page attrs to Inner-Shareable
KVM: arm64: selftests: Introduce and use hardware-definition macros
KVM: VMX: Use separate subclasses for PI wakeup lock to squash false positive
KVM: VMX: Assert that IRQs are disabled when putting vCPU on PI wakeup list
KVM: x86: Explicitly zero-initialize on-stack CPUID unions
KVM: Allow building irqbypass.ko as as module when kvm.ko is a module
KVM: x86/mmu: Wrap sanity check on number of TDP MMU pages with KVM_PROVE_MMU
KVM: selftests: Add option to rseq test to override /dev/cpu_dma_latency
KVM: x86: Acquire SRCU in KVM_GET_MP_STATE to protect guest memory accesses
Documentation: kvm: remove KVM_CAP_MIPS_TE
Documentation: kvm: organize capabilities in the right section
Documentation: kvm: fix some definition lists
Documentation: kvm: drop "Capability" heading from capabilities
Documentation: kvm: give correct name for KVM_CAP_SPAPR_MULTITCE
Documentation: KVM: KVM_GET_SUPPORTED_CPUID now exposes TSC_DEADLINE
selftests: kvm: list once tests that are valid on all architectures
selftests: kvm: bring list of exit reasons up to date
selftests: kvm: revamp MONITOR/MWAIT tests
KVM: arm64: Don't translate FAR if invalid/unsafe
...
Pull probes fixes from Masami Hiramatsu:
- fprobe: remove fprobe_hlist_node when module unloading
When a fprobe target module is removed, the fprobe_hlist_node should
be removed from the fprobe's hash table to prevent reusing
accidentally if another module is loaded at the same address.
- fprobe: lock module while registering fprobe
The module containing the function to be probeed is locked using a
reference counter until the fprobe registration is complete, which
prevents use after free.
- fprobe-events: fix possible UAF on modules
Basically as same as above, but in the fprobe-events layer we also
need to get module reference counter when we find the tracepoint in
the module.
* tag 'probes-fixes-v6.14' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
tracing: fprobe: Cleanup fprobe hash when module unloading
tracing: fprobe events: Fix possible UAF on modules
tracing: fprobe: Fix to lock module while registering fprobe
Pull cgroup fixes from Tejun Heo:
- A number of cpuset remote partition related fixes and cleanups along
with selftest updates.
- A change from this merge window made cgroup_rstat_updated_list()
called outside cgroup_rstat_lock leading to list corruptions. Fix it
by relocating the call inside the lock.
* tag 'cgroup-for-6.15-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
cgroup/cpuset: Fix race between newly created partition and dying one
cgroup: rstat: call cgroup_rstat_updated_list with cgroup_rstat_lock
selftest/cgroup: Add a remote partition transition test to test_cpuset_prs.sh
selftest/cgroup: Clean up and restructure test_cpuset_prs.sh
selftest/cgroup: Update test_cpuset_prs.sh to use | as effective CPUs and state separator
cgroup/cpuset: Remove unneeded goto in sched_partition_write() and rename it
cgroup/cpuset: Code cleanup and comment update
cgroup/cpuset: Don't allow creation of local partition over a remote one
cgroup/cpuset: Remove remote_partition_check() & make update_cpumasks_hier() handle remote partition
cgroup/cpuset: Fix error handling in remote_partition_disable()
cgroup/cpuset: Fix incorrect isolated_cpus update in update_parent_effective_cpumask()
Pull CRC cleanups from Eric Biggers:
"Finish cleaning up the CRC kconfig options by removing the remaining
unnecessary prompts and an unnecessary 'default y', removing
CONFIG_LIBCRC32C, and documenting all the CRC library options"
* tag 'crc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux:
lib/crc: remove CONFIG_LIBCRC32C
lib/crc: document all the CRC library kconfig options
lib/crc: remove unnecessary prompt for CONFIG_CRC_ITU_T
lib/crc: remove unnecessary prompt for CONFIG_CRC_T10DIF
lib/crc: remove unnecessary prompt for CONFIG_CRC16
lib/crc: remove unnecessary prompt for CONFIG_CRC_CCITT
lib/crc: remove unnecessary prompt for CONFIG_CRC32 and drop 'default y'
A recent optimization change in LLVM [1] aims to transform certain loop
idioms into calls to strlen() or wcslen(). This change transforms the
first while loop in UniStrcat() into a call to wcslen(), breaking the
build when UniStrcat() gets inlined into alloc_path_with_tree_prefix():
ld.lld: error: undefined symbol: wcslen
>>> referenced by nls_ucs2_utils.h:54 (fs/smb/client/../../nls/nls_ucs2_utils.h:54)
>>> vmlinux.o:(alloc_path_with_tree_prefix)
>>> referenced by nls_ucs2_utils.h:54 (fs/smb/client/../../nls/nls_ucs2_utils.h:54)
>>> vmlinux.o:(alloc_path_with_tree_prefix)
Disable this optimization with '-fno-builtin-wcslen', which prevents the
compiler from assuming that wcslen() is available in the kernel's C
library.
[ More to the point - it's not that we couldn't implement wcslen(), it's
that this isn't an optimization at all in the context of the kernel.
Replacing a simple inlined loop with a function call to the same loop
is just stupid and pointless if you don't have long strings and fancy
libraries with vectorization support etc.
For the regular 'strlen()' cases, we want the compiler to do this in
order to handle the trivial case of constant strings. And we do have
optimized versions of 'strlen()' on some architectures. But for
wcslen? Just no. - Linus ]
Cc: stable@vger.kernel.org
Link: 9694844d7e [1]
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Perf can hang while freeing a sigtrap event if a related deferred
signal hadn't managed to be sent before the file got closed:
perf_event_overflow()
task_work_add(perf_pending_task)
fput()
task_work_add(____fput())
task_work_run()
____fput()
perf_release()
perf_event_release_kernel()
_free_event()
perf_pending_task_sync()
task_work_cancel() -> FAILED
rcuwait_wait_event()
Once task_work_run() is running, the list of pending callbacks is
removed from the task_struct and from this point on task_work_cancel()
can't remove any pending and not yet started work items, hence the
task_work_cancel() failure and the hang on rcuwait_wait_event().
Task work could be changed to remove one work at a time, so a work
running on the current task can always cancel a pending one, however
the wait / wake design is still subject to inverted dependencies when
remote targets are involved, as pictured by Oleg:
T1 T2
fd = perf_event_open(pid => T2->pid); fd = perf_event_open(pid => T1->pid);
close(fd) close(fd)
<IRQ> <IRQ>
perf_event_overflow() perf_event_overflow()
task_work_add(perf_pending_task) task_work_add(perf_pending_task)
</IRQ> </IRQ>
fput() fput()
task_work_add(____fput()) task_work_add(____fput())
task_work_run() task_work_run()
____fput() ____fput()
perf_release() perf_release()
perf_event_release_kernel() perf_event_release_kernel()
_free_event() _free_event()
perf_pending_task_sync() perf_pending_task_sync()
rcuwait_wait_event() rcuwait_wait_event()
Therefore the only option left is to acquire the event reference count
upon queueing the perf task work and release it from the task work, just
like it was done before 3a5465418f ("perf: Fix event leak upon exec and file release")
but without the leaks it fixed.
Some adjustments are necessary to make it work:
* A child event might dereference its parent upon freeing. Care must be
taken to release the parent last.
* Some places assuming the event doesn't have any reference held and
therefore can be freed right away must instead put the reference and
let the reference counting to its job.
Reported-by: "Yi Lai" <yi1.lai@linux.intel.com>
Closes: https://lore.kernel.org/all/Zx9Losv4YcJowaP%2F@ly-workstation/
Reported-by: syzbot+3c4321e10eea460eb606@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/673adf75.050a0220.87769.0024.GAE@google.com/
Fixes: 3a5465418f ("perf: Fix event leak upon exec and file release")
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20250304135446.18905-1-frederic@kernel.org
The tfilter_notify() and tfilter_del_notify() functions assume that
NLMSG_GOODSIZE is always enough to dump the filter chain. This is not
always the case, which can lead to silent notify failures (because the
return code of tfilter_notify() is not always checked). In particular,
this can lead to NLM_F_ECHO not being honoured even though an action
succeeds, which forces userspace to create workarounds[0].
Fix this by increasing the message size if dumping the filter chain into
the allocated skb fails. Use the size of the incoming skb as a size hint
if set, so we can start at a larger value when appropriate.
To trigger this, run the following commands:
# ip link add type veth
# tc qdisc replace dev veth0 root handle 1: fq_codel
# tc -echo filter add dev veth0 parent 1: u32 match u32 0 0 $(for i in $(seq 32); do echo action pedit munge ip dport set 22; done)
Before this fix, tc just returns:
Not a filter(cmd 2)
After the fix, we get the correct echo:
added filter dev veth0 parent 1: protocol all pref 49152 u32 chain 0 fh 800::800 order 2048 key ht 800 bkt 0 terminal flowid not_in_hw
match 00000000/00000000 at 0
action order 1: pedit action pass keys 1
index 1 ref 1 bind 1
key #0 at 20: val 00000016 mask ffff0000
[repeated 32 times]
[0] 106ef21860
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Reported-by: Frode Nordahl <frode.nordahl@canonical.com>
Closes: https://bugs.launchpad.net/ubuntu/+source/openvswitch/+bug/2018500
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://patch.msgid.link/20250407105542.16601-1-toke@redhat.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
When running as a PVH dom0 the ACPI tables exposed to Linux are (mostly)
the native ones, thus exposing the C and P states, that can lead to
attachment of CPU idle and frequency drivers. However the entity in
control of the CPU C and P states is Xen, as dom0 doesn't have a full view
of the system load, neither has all CPUs assigned and identity pinned.
Like it's done for classic PV guests, prevent Linux from using idle or
frequency state drivers when running as a PVH dom0.
On an AMD EPYC 7543P system without this fix a Linux PVH dom0 will keep the
host CPUs spinning at 100% even when dom0 is completely idle, as it's
attempting to use the acpi_idle driver.
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jason Andryuk <jason.andryuk@amd.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Message-ID: <20250407101842.67228-1-roger.pau@citrix.com>
The current code configures the Physical Function (PF) root node at TL1
and the Virtual Function (VF) root node at TL2.
This ensure at any given point of time PF traffic gets more priority.
PF root node
TL1
/ \
TL2 TL2 VF root node
/ \
TL3 TL3
/ \
TL4 TL4
/ \
SMQ SMQ
Due to a bug in the current code, the TL2 parent queue index on the
VF interface is not being configured, leading to 'SMQ Flush' errors
Fixes: 5e6808b4c6 ("octeontx2-pf: Add support for HTB offload")
Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250407070341.2765426-1-hkelam@marvell.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
KVM/arm64: First batch of fixes for 6.15
- Rework heuristics for resolving the fault IPA (HPFAR_EL2 v. re-walk
stage-1 page tables) to align with the architecture. This avoids
possibly taking an SEA at EL2 on the page table walk or using an
architecturally UNKNOWN fault IPA.
- Use acquire/release semantics in the KVM FF-A proxy to avoid reading
a stale value for the FF-A version.
- Fix KVM guest driver to match PV CPUID hypercall ABI.
- Use Inner Shareable Normal Write-Back mappings at stage-1 in KVM
selftests, which is the only memory type for which atomic
instructions are architecturally guaranteed to work.
syzbot discovered that it can disconnect a TLS socket and then
run into all sort of unexpected corner cases. I have a vague
recollection of Eric pointing this out to us a long time ago.
Supporting disconnect is really hard, for one thing if offload
is enabled we'd need to wait for all packets to be _acked_.
Disconnect is not commonly used, disallow it.
The immediate problem syzbot run into is the warning in the strp,
but that's just the easiest bug to trigger:
WARNING: CPU: 0 PID: 5834 at net/tls/tls_strp.c:486 tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486
RIP: 0010:tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486
Call Trace:
<TASK>
tls_rx_rec_wait+0x280/0xa60 net/tls/tls_sw.c:1363
tls_sw_recvmsg+0x85c/0x1c30 net/tls/tls_sw.c:2043
inet6_recvmsg+0x2c9/0x730 net/ipv6/af_inet6.c:678
sock_recvmsg_nosec net/socket.c:1023 [inline]
sock_recvmsg+0x109/0x280 net/socket.c:1045
__sys_recvfrom+0x202/0x380 net/socket.c:2237
Fixes: 3c4d755915 ("tls: kernel TLS support")
Reported-by: syzbot+b4cd76826045a1eb93c1@syzkaller.appspotmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Link: https://patch.msgid.link/20250404180334.3224206-1-kuba@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
sctp_sendmsg() re-uses associations and transports when possible by
doing a lookup based on the socket endpoint and the message destination
address, and then sctp_sendmsg_to_asoc() sets the selected transport in
all the message chunks to be sent.
There's a possible race condition if another thread triggers the removal
of that selected transport, for instance, by explicitly unbinding an
address with setsockopt(SCTP_SOCKOPT_BINDX_REM), after the chunks have
been set up and before the message is sent. This can happen if the send
buffer is full, during the period when the sender thread temporarily
releases the socket lock in sctp_wait_for_sndbuf().
This causes the access to the transport data in
sctp_outq_select_transport(), when the association outqueue is flushed,
to result in a use-after-free read.
This change avoids this scenario by having sctp_transport_free() signal
the freeing of the transport, tagging it as "dead". In order to do this,
the patch restores the "dead" bit in struct sctp_transport, which was
removed in
commit 47faa1e4c5 ("sctp: remove the dead field of sctp_transport").
Then, in the scenario where the sender thread has released the socket
lock in sctp_wait_for_sndbuf(), the bit is checked again after
re-acquiring the socket lock to detect the deletion. This is done while
holding a reference to the transport to prevent it from being freed in
the process.
If the transport was deleted while the socket lock was relinquished,
sctp_sendmsg_to_asoc() will return -EAGAIN to let userspace retry the
send.
The bug was found by a private syzbot instance (see the error report [1]
and the C reproducer that triggers it [2]).
Link: https://people.igalia.com/rcn/kernel_logs/20250402__KASAN_slab-use-after-free_Read_in_sctp_outq_select_transport.txt [1]
Link: https://people.igalia.com/rcn/kernel_logs/20250402__KASAN_slab-use-after-free_Read_in_sctp_outq_select_transport__repro.c [2]
Cc: stable@vger.kernel.org
Fixes: df132eff46 ("sctp: clear the transport of some out_chunk_list chunks in sctp_assoc_rm_peer")
Suggested-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Ricardo Cañuelo Navarro <rcn@igalia.com>
Acked-by: Xin Long <lucien.xin@gmail.com>
Link: https://patch.msgid.link/20250404-kasan_slab-use-after-free_read_in_sctp_outq_select_transport__20250404-v1-1-5ce4a0b78ef2@igalia.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Cong Wang says:
====================
net_sched: make ->qlen_notify() idempotent
Gerrard reported a vulnerability exists in fq_codel where manipulating
the MTU can cause codel_dequeue() to drop all packets. The parent qdisc's
sch->q.qlen is only updated via ->qlen_notify() if the fq_codel queue
remains non-empty after the drops. This discrepancy in qlen between
fq_codel and its parent can lead to a use-after-free condition.
Let's fix this by making all existing ->qlen_notify() idempotent so that
the sch->q.qlen check will be no longer necessary.
Patch 1~5 make all existing ->qlen_notify() idempotent to prepare for
patch 6 which removes the sch->q.qlen check. They are followed by 5
selftests for each type of Qdisc's we touch here.
All existing and new Qdisc selftests pass after this patchset.
Fixes: 4b549a2ef4 ("fq_codel: Fair Queue Codel AQM")
Fixes: 76e3cc126b ("codel: Controlled Delay AQM")
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
====================
Link: https://patch.msgid.link/20250403211033.166059-1-xiyou.wangcong@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
