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1,482,137 commits

Author SHA1 Message Date
Mikhail Zaslonko
4467df89db s390/debug: Reject NULL debug info in debug_dump()
debug_dump() passes id on to debug_info_copy(), which dereferences
in->name unchecked. debug_unregister(), debug_set_size() and
debug_register_view() guard against a NULL id but debug_dump() does not.
Nothing reaches this today, but add the check for consistency.

Reported-by: Sashiko <sashiko-bot@kernel.org>
Closes: https://lore.kernel.org/all/20260910110147.96E851F000FF@smtp.kernel.org/
Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2026-09-22 12:24:22 +02:00
Peter Oberparleiter
f4d04425e6 s390/cmf: Fix virtual vs physical address confusion
The measurement block address is an absolute address. Define the
associated schib_config and schib fields as dma64_t to enable automatic
detection of incorrect assignments. Also add the missing virt_to_dma64()
translation.

Without this fix, a wrong address will be used by firmware when storing
extended format channel measurement data on kernels built with
CONFIG_RANDOMIZE_IDENTITY_BASE=y.

Fixes: 14edd0d73b ("s390/cmf: fix virtual vs physical address confusion")
Cc: stable@vger.kernel.org
Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2026-09-22 12:21:04 +02:00
Niklas Schnelle
3a43be7a1f s390/pci: Don't report recovery success on skipped recovery
When a PCI device is already in the permanent failure state, recovery is
skipped, but the SCLP recovery report still shows success. Fix this by
changing the status string to explicitly state that recovery was skipped
due to permanent failure.

Cc: stable@vger.kernel.org
Fixes: 4ec6054e73 ("s390/pci: Report PCI error recovery results via SCLP")
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Reviewed-by: Farhan Ali <alifm@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2026-09-22 12:21:04 +02:00
Niklas Schnelle
a1120bea9b s390/pci: Report SCLP status on error events when no pdev is associated
With commit 4ec6054e73 ("s390/pci: Report PCI error recovery results
via SCLP") SCLP reports are generated when recovery is performed in
response to an error event. If such an error event arrives but no pdev
is currently associated with the zdev, e.g. because it was removed or
not yet probed, no report is generated. Fix this by generating a report
specific to an error event for a zdev without an associated pdev.

Cc: stable@vger.kernel.org
Fixes: 4ec6054e73 ("s390/pci: Report PCI error recovery results via SCLP")
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Reviewed-by: Farhan Ali <alifm@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2026-09-22 12:21:04 +02:00
Niklas Schnelle
0261aef4b1 s390/pci: Fix missing device lock in zpci_report_status()
When pdev is non-NULL, zpci_report_status() accesses the device's driver.
To get a consistent state matching the recovery, the device lock needs to
be held. Do so by expanding the existing device lock critical section.

The lock only needs to be held when the pdev is non-NULL, so extract
the pdev-specific reporting into a helper function which also adds a
lockdep assertion to detect calls without the device lock held.

Cc: stable@vger.kernel.org
Fixes: 4ec6054e73 ("s390/pci: Report PCI error recovery results via SCLP")
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Reviewed-by: Farhan Ali <alifm@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2026-09-22 12:21:04 +02:00
Niklas Schnelle
09b7040a1b s390/pci: Fix leak of struct pci_dev reference in zpci_report_status()
In zpci_report_status(), a reference to the pdev associated with the
zdev being reported about is acquired using pci_get_slot(). This
reference needs to be dropped with pci_dev_put(), but this call is
missing, thus leaking the reference. On subsequent hot unplug, this will
cause the struct pci_dev to not be released, leaking memory and
preventing reattach.

At the same time, the only existing caller already holds a pdev
reference. So instead of reacquiring and then dropping another reference,
simply pass the existing pdev pointer to zpci_report_status(). This gets
rid of the need for pci_get_slot() as well as the zdev->zbus check.

Cc: stable@vger.kernel.org
Fixes: 4ec6054e73 ("s390/pci: Report PCI error recovery results via SCLP")
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Reviewed-by: Farhan Ali <alifm@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2026-09-22 12:21:04 +02:00
Vineeth Vijayan
9590f4d838 s390/cio: Guard PMCW field accesses with dnv check
When PMCW.DNV is 0, no I/O device is associated with the subchannel.
However, several code paths access PMCW fields directly from the cached
sch->schib without first invoking the update helper. Add explicit DNV
validation before accessing PMCW fields from the cached SCHIB to avoid
using invalid data.

Reported-by: William Bezenah <wbezenah@linux.ibm.com>
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Fixes: 8c58a22968 ("s390/cio: Do not unregister the subchannel based on DNV")
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2026-09-17 06:59:41 +02:00
Vineeth Vijayan
f6f2985eab s390/cio: Check pmcw.dnv before pmcw.ena in I/O entry points
The device number valid (dnv) bit in the PMCW must be checked before
acting on any other PMCW fields for IO-type subchannels. A subchannel
with dnv=0 has no valid device number associated, making it meaningless
to evaluate the enabled (ena) state or issue any I/O instruction against
it.

Reported-by: William Bezenah <wbezenah@linux.ibm.com>
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Fixes: 8c58a22968 ("s390/cio: Do not unregister the subchannel based on DNV")
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2026-09-17 06:59:41 +02:00
Vineeth Vijayan
29d9e5835d s390/cio: Fix cio_update_schib() to not cache invalid schib
When pmcw.dnv is 0, the contents of all SCHIB fields are unpredictable.
Zero sch->schib in that case to prevent subsequent code from making
decisions based on unpredictable data.

Reported-by: William Bezenah <wbezenah@linux.ibm.com>
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Fixes: 8c58a22968 ("s390/cio: Do not unregister the subchannel based on DNV")
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2026-09-17 06:59:41 +02:00
Karl Mehltretter
4525a91104 s390/pci/docs: Fix sriov_numvfs attribute name
The attribute is sriov_numvfs (drivers/pci/iov.c); the document names it
sriov_numvf, which does not exist.

Use sriov_numvfs.

Fixes: de267a7c71 ("s390/pci: Documentation for zPCI")
Assisted-by: LLM
Signed-off-by: Karl Mehltretter <kmehltretter@gmail.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2026-09-17 06:59:41 +02:00
Hemanth Selam
2f91fc9a96 s390: Fix typos in comments
Fix typos in comments, reported by scripts/checkpatch.pl using the
misspelling list in scripts/spelling.txt.  Only touches comments, no code
changes.

Assisted-by: Cursor:claude-opus-5
Signed-off-by: Hemanth Selam <hemanth.selam@gmail.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2026-09-17 06:59:41 +02:00
Heiko Carstens
dc2136341b s390/crypto: Enable CONTEXT_ANALYSIS
Enable CONTEXT_ANALYSIS since s390's crypto code compiles now without
warnings.

Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2026-09-08 15:53:41 +02:00
Harald Freudenberger
7a08507ea5 s390/crypto: Map EBUSY to EIO when key conversion fails repeatedly
When hardware persistently returns -EBUSY after exhausting retries,
the error propagates to crypto_finalize_*_request(). The crypto API's
completion wrapper treats -EBUSY as a queueing status and swallows it,
preventing the completion callback from firing. This causes callers
using crypto_wait_req() to block indefinitely.

Translate persistent -EBUSY to -EIO after retry exhaustion to ensure
proper error propagation and callback invocation.

Fixes: 6cd87cb5ef ("s390/crypto: Rework protected key AES for true asynch support")
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Cc: stable@vger.kernel.org # 6.16+
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2026-09-08 15:53:41 +02:00
Harald Freudenberger
ac14813201 s390/crypto: Fix wrong return code to engine in asynch callbacks
When crypto_finalize_hash_request() or
crypto_finalize_skcipher_request() explicitly completes a request, the
do_one_request callback must return 0 to indicate successful
handling. Returning a negative error code causes the crypto engine to
assume the driver failed to take ownership and triggers a second
completion via crypto_request_complete(), resulting in a double
completion. This pattern occurs in paes_s390.c 4 times and once in
phmac_s390.c.

Fixed in phmac_do_one_request() and all four paes do_one_request
callbacks (ecb, cbc, ctr, xts) by returning 0 after explicit
finalization instead of propagating the error code.

Fixes: 6cd87cb5ef ("s390/crypto: Rework protected key AES for true asynch support")
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Cc: stable@vger.kernel.org # 6.16+
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2026-09-08 15:53:41 +02:00
Harald Freudenberger
3301483714 s390/crypto: Fix handling of EBUSY in PHMAC when req is pushed to crypto engine
When a request is transferred to the engine via
crypto_transfer_hash_request_to_engine() there are two return codes
signaling a successful transfer: EINPROGRESS and EBUSY. However the
correct handling of EBUSY was missing and has been added as a return
code indicating a successful transfer to the crypto engine.

Fixes: cbbc675506 ("crypto: s390 - New s390 specific protected key hash phmac")
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Cc: stable@vger.kernel.org # 6.17+
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2026-09-08 15:53:41 +02:00
Harald Freudenberger
3fec882c33 s390/crypto: Fix handling of EBUSY in PAES when req is pushed to crypto engine
When a request is transferred to the engine via
crypto_transfer_skcipher_request_to_engine() there are two return
codes signaling a successful transfer: EINPROGRESS and EBUSY. However
the correct handling of EBUSY was missing and has been added as a
return code indicating a successful transfer to the crypto engine.

Fixes: 6cd87cb5ef ("s390/crypto: Rework protected key AES for true asynch support")
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Cc: stable@vger.kernel.org # 6.16+
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2026-09-08 15:53:41 +02:00
Harald Freudenberger
5b97b96903 s390/crypto: Fix missing cra_flags in paes_s390
The 4 algorithms implemented in paes_s390 never had any cra_flags
set. So add code which sets the cra_flag to CRYPTO_ALG_ASYNC and
CRYPTO_ALG_NO_FALLBACK.

Fixes: 4ccd065a69 ("crypto: ahash - Add support for drivers with no fallback")
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Cc: stable@vger.kernel.org # 6.17+
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2026-09-08 15:53:41 +02:00
Harald Freudenberger
749990db95 s390/crypto: Fix use of mutex in atomic context in PAES
The PAES CTR implementation used a mutex to lock one page of exclusive
memory for fast CTR processing. Unfortunately a mutex is not save to
use in atomic or interrupt context. So use a binary semaphore instead
which is save to use in such environments.

Furthermore rework the code to get rid of conditional locking. So
restructure the PAES CRT code by extracting the main loop into a
separate function and just give in information about the (locked) page
can be used or not (is not locked).

Fixes: 6cd87cb5ef ("s390/crypto: Rework protected key AES for true asynch support")
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Cc: stable@vger.kernel.org # 6.16+
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2026-09-08 15:53:41 +02:00
Harald Freudenberger
19a218b46b s390/crypto: Fix missing scrub of temp buffers with PAES algorithm
In function ctr_paes_do_crypt() there is a buffer used to process
remaining bytes < AES_BLOCK_SIZE. This buffer was not scrubbed and
thus could lead to expose of unwanted data. Rework the code to
explicitly scrub the buffer at the end of the function to avoid
exposure of maybe sensitive data.

In function __xts_2keys_prep_param() change the existing scrub to
clean the whole param block instead of just the key field.

Fixes: 6cd87cb5ef ("s390/crypto: Rework protected key AES for true asynch support")
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Cc: stable@vger.kernel.org # 6.16+
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2026-09-08 15:53:41 +02:00
Harald Freudenberger
4036483738 s390/crypto: Fix return code handling at skcipher_walk_done in PAES algorithms
All the 4 PAES cipher processing loops were not checking the return
value of skcipher_walk_done() immediately after calling it. This could
lead to error masking when both the walk operation failed and a
subsequent key conversion was needed (k < n condition).

Add immediate error checks after skcipher_walk_done() in all main
processing loops (ECB, CBC, CTR, XTS modes) to ensure walk errors are
properly propagated and not masked by subsequent operations.

With that comes a slight rework around the skcipher_walk_done()
invocation. It is now necessary to check if the walk has already been
finalized (walk->nbytes is then 0) or not to avoid double
de-allocation of resources held by the walk.

Fixes: 6cd87cb5ef ("s390/crypto: Rework protected key AES for true asynch support")
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Cc: stable@vger.kernel.org # 6.16+
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2026-09-08 15:53:41 +02:00
Harald Freudenberger
d1c44a7d08 s390/crypto: Fix use of mutex in atomic context
The AES CTR implementation used a mutex to lock one page of exclusive
memory for fast CTR processing. Unfortunately a mutex is not save to
use in atomic or interrupt context. So use a binary semaphore instead
which is save to use in such environments.

Furthermore rework the code to get rid of conditional locking. So
restructure the AES CRT code by extracting the main loop into a
separate function and just give in information about the (locked) page
can be used or not (is not locked).

Fixes: 7988fb2c03 ("crypto: s390/aes - convert to skcipher API")
Suggested-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Cc: stable@vger.kernel.org # 5.5+
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2026-09-08 15:53:40 +02:00
Harald Freudenberger
8b7c3b6914 s390/crypto: Fix missing scrub of temp buffers with AES ctr and gcm algorithm
In function ctr_aes_crypt() there is a buffer used to process
remaining bytes < AES_BLOCK_SIZE. This buffer was not scrubbed and
thus could lead to expose of unwanted data. When the buffer is used
explicitly scrub it at the end of the code block to avoid exposure of
maybe sensitive data.

In a similar way the function gcm_aes_crypt() hat an error path where
the CPACF param block was not scrubbed. Instead of return early now
these error paths go to end of function where explicit scrubbing is
done. Similar with the buffers which are part of the gcm_sg_walk
structs from the variables gw_in and gw_out.

Fixes: d07f951903 ("crypto: s390/aes - Fix buffer overread in CTR mode")
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Cc: stable@vger.kernel.org # 6.8+
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2026-09-08 15:53:40 +02:00
Harald Freudenberger
15fa028589 s390/crypto: Fix skcipher_walk return code handling in aes_s390
The return codes from skcipher_walk_virt() were not properly checked
before entering the processing loops in ecb_aes_crypt() and ctr_aes_crypt().
If skcipher_walk_virt() fails, the walk structure may be in an undefined
state, and attempting to process data could lead to incorrect behavior
or accessing uninitialized memory.

Add proper return code checking to ensure correct handling of the walk
initialization and walk advance and eventually return to the caller
with that return code.

Fixes: 7988fb2c03 ("crypto: s390/aes - convert to skcipher API")
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Cc: stable@vger.kernel.org # 5.5+
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2026-09-08 15:53:40 +02:00
Mikhail Zaslonko
0945285e6c s390/debug: Fix race between debug area resize and event logging
Trace functions check for non-NULL id->areas without lock to minimize
overhead. This opens a race window where a NULL pointer dereference
occurs if id->areas is set to NULL (e.g. via echo 0 > ../pages) after
the check and before id->lock is taken.

Fix this by rechecking id->areas under lock.

Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2026-09-08 15:53:40 +02:00
Mikhail Zaslonko
22d4210bf9 s390/debug: Do not repeat parameter override notice on debug_set_level()
Commit a2cec68637 ("s390/debug: Add s390dbf kernel parameter") calls
debug_get_param() from both debug_info_create() and debug_set_level().
Since debug_get_param() emits the override notice unconditionally, and
drivers typically call debug_set_level() right after debug_register(),
the same line is printed twice per debug area:

  s390dbf: 0.0.1234: override level to 6
  s390dbf: 0.0.1234: override level to 6

For areas registered per device this is multiplied by the device count.
With 's390dbf=0.0.*:6' a system with many DASDs emits a large number of
redundant lines during boot.

Add a quiet parameter to debug_get_param() and pass quiet=true from
debug_set_level(), where the override has already been announced during
registration. The remaining callers keep printing the notice.

Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2026-09-08 15:53:40 +02:00
Mikhail Zaslonko
b1eb31d533 s390/debug: Fix NULL pointer dereference in debug_set_level()
Commit a2cec68637 ("s390/debug: Add s390dbf kernel parameter")
incorrectly removed a null-id check from debug_set_level(), introducing
a possible NULL pointer dereference for debug-API users that put
debug_register() results unchecked into debug_set_level().

Fix this by moving the check from the internal _debug_set_level()
variant back to the external debug_set_level() wrapper.

Fixes: a2cec68637 ("s390/debug: Add s390dbf kernel parameter")

Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2026-09-08 15:53:40 +02:00
Thomas Richter
9ecc4d0338 s390/pai: Support CPU hotplug for PMU PAI
The command 'perf stat -e pai_crypto/CRYPTO_ALL/ -- <command>'
crashes the kernel when CPUs are hotplug added during that run.

Root cause is the missing allocation of per-CPU data structures
for that new CPU. The allocation is dynamic and the first
event that has task context creates such a structure for
each online CPU. This is not sufficient. CPUs may be offline
during event creation and can be set online during the
perf run time. For example commands

 # echo 0 > /sys/devices/system/cpu/cpu1/online
 # perf stat -e cycles -i -- stress-ng -t10s --matrix X
 # sleep 1
 # echo 1 > /sys/devices/system/cpu/cpu1/online

Currently without a CPU hotplug handler, that new CPU has no
per-CPU data infrastructure. The scheduler runs PMU call back
function pai_add() to install the PMU support for that CPU before
the task is being scheduled on that new CPU.
In pai_add() instructions

    mp = this_cpu_ptr(pai_root[idx].mapptr);
    cpump = mp->mapptr;

return a NULL pointer and the result is a kernel panic as variable
cpump is used inside that function.

Add CPU hotplug support for CPU add and delete and create
the necessary per-CPU data infrastructure during CPU hotplug
add processing. Same for CPU hotplug remove.
This is done when the CPU is offline to ensure the data structures
are available when CPU is made online and tasks are scheduled on it.

[hca@linux.ibm.com: fixup error path in pai_init()]

Cc: stable@vger.kernel.org # v6.19
Fixes: 582cc1b28e ("s390/pai_ext: Enable per-task and system-wide sampling event")
Fixes: 9f66572f28 ("s390/pai_crypto: Enable per-task and system-wide sampling event")
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Jan Polensky <japo@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2026-09-08 15:53:40 +02:00
Thomas Richter
e8df39dacb s390/pai: Move locking to event init and delete
Move mutex locking from per CPU allocation to event allocation.
No functional change.

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2026-09-08 15:53:40 +02:00
Thomas Richter
4eef4ab3aa s390/pai: Use PAI PMU index as parameter replacing event
Use PAI PMU index value as function argument instead of pointer
to struct perf_event. Only that index value is used inside
functions pai_alloc_cpu() and pai_event_destroy_cpu().
No functional change.

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2026-09-08 15:53:40 +02:00
Linus Torvalds
df2908090c Linux 7.3-rc2 v7.3-rc2 2026-09-06 15:07:20 -07:00
Linus Torvalds
b1e00ffaf9 tracing fixes for v7.3:
- Fix several tracefs files that did not take the trace_array reference
 
   A trace instance can be created and destroyed in the tracefs "instances"
   directory via mkdir and rmdir respectively. The instance is represented by
   a trace_array descriptor. Most tracefs files pass the trace_array as the
   private data of the inode to the open/read/write functions. Since there is
   no locking between the time a task opens a file and the deletion of the
   instance (and the freeing of the trace_array), each open needs to get a
   reference to the trace_array and each close must remove it. A instance
   can't be removed if there's any reference taken on its trace_array. The
   open function uses trace_array_get() that takes a lock (preventing removal
   of instances) and iterates the list of all existing trace_arrays and if it
   finds a match, it takes the reference and releases the lock. If it doesn't
   find a match, it causes the open to return -ENODEV.
 
   There were some added files that did not take the trace_array reference
   on open that needed to be fixed. Sashiko also correctly pointed out that
   there were some files that took an address of an field or element of the
   trace_array which had a pointer back to the trace_array to take its
   reference on open. But this leaves a slight race between referencing this
   element to get the trace_array as the element itself could be freed. To
   solve this, some helper functions were created to look for trace_arrays
   with this field or element in the search so that the element did not have
   to be dereferenced before the trace_array's reference was taken.
 
 - Add a lock around ftrace_ops initialization
 
   When a ftrace_ops is first used by ftrace, some internal initialization is
   performed on the ops. But if multiple tasks were calling functions that
   did this initialization, it could race and perform doing the
   initialization more than once, corrupting the internal data. Add a lock in
   the initialization code to prevent this from happening.
 
 - Fix splice reads on mmapped buffers
 
   The logic in the ring buffer splice code for mmapped buffers is supposed
   to do a copy of the memory as the mapped buffers can't be given to splice.
   But there was an if statement within the copy code that would return a -1
   if a request for a full page was done and it wasn't a partial read. This
   is because this logic was written before mmapped buffers existed and this
   case didn't make sense at the time. For mmapped buffers it makes perfect
   sense and by returning early can drop a lot of pages unnecessarily.
 
 - Have the persistent ring buffer validation check nr_subbufs
 
   Sashiko reported that the validation code was relying on the saved
   nr_subbufs to match the calculated nr_pages + 1 and if they were off, that
   the code could cause corruption. Sashiko is correct, and the saved
   nr_subbufs should be validated before assuming it is correct.
 
 - Do not allow more than one instance with the same name on cmdline
 
   If an admin were to add more than one trace instances with the same name
   they all would be created, but only the first one would be accessible via
   tracefs. This used to not be allowed but some restructuring of code has
   since made it possible.
 
 - Fix the race between subbuf resize and trace_pipe_raw readers
 
   If a task was reading trace_pipe_raw while another task was changing the
   ring buffer subbuf size, it could crash the reader. The trace_pipe_raw
   readers do get their own copy of the page from the buffer, but the code
   needs some restructuring to not have the resize of the subbuffers cause
   issues.
 
 - Cap the size of the mapped (static) ring buffer nr_pages
 
   The meta data used for ring buffer mapped buffers is 32 bit in size. A
   normal ring buffer could (in theory) have more than 4 billion pages.
   But this is not allowed by mapped buffers, so enforce it.
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Merge tag 'trace-v7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull tracing fixes from Steven Rostedt:

 - Fix several tracefs files that did not take the trace_array reference

   A trace instance can be created and destroyed in the tracefs
   "instances" directory via mkdir and rmdir respectively. The instance
   is represented by a trace_array descriptor.

   Most tracefs files pass the trace_array as the private data of the
   inode to the open/read/write functions. Since there is no locking
   between the time a task opens a file and the deletion of the instance
   (and the freeing of the trace_array), each open needs to get a
   reference to the trace_array and each close must remove it.

   An instance can't be removed if there's any reference taken on its
   trace_array. The open function uses trace_array_get() that takes a
   lock (preventing removal of instances) and iterates the list of all
   existing trace_arrays and if it finds a match, it takes the reference
   and releases the lock. If it doesn't find a match, it causes the open
   to return -ENODEV.

   There were some added files that did not take the trace_array
   reference on open that needed to be fixed. Sashiko also correctly
   pointed out that there were some files that took an address of an
   field or element of the trace_array which had a pointer back to the
   trace_array to take its reference on open. But this leaves a slight
   race between referencing this element to get the trace_array as the
   element itself could be freed. To solve this, some helper functions
   were created to look for trace_arrays with this field or element in
   the search so that the element did not have to be dereferenced before
   the trace_array's reference was taken.

 - Add a lock around ftrace_ops initialization

   When a ftrace_ops is first used by ftrace, some internal
   initialization is performed on the ops. But if multiple tasks were
   calling functions that did this initialization, it could race and
   perform doing the initialization more than once, corrupting the
   internal data. Add a lock in the initialization code to prevent this
   from happening.

 - Fix splice reads on mmapped buffers

   The logic in the ring buffer splice code for mmapped buffers is
   supposed to do a copy of the memory as the mapped buffers can't be
   given to splice. But there was an if statement within the copy code
   that would return a -1 if a request for a full page was done and it
   wasn't a partial read. This is because this logic was written before
   mmapped buffers existed and this case didn't make sense at the time.
   For mmapped buffers it makes perfect sense and by returning early can
   drop a lot of pages unnecessarily.

 - Have the persistent ring buffer validation check nr_subbufs

   Sashiko reported that the validation code was relying on the saved
   nr_subbufs to match the calculated nr_pages + 1 and if they were off,
   that the code could cause corruption. Sashiko is correct, and the
   saved nr_subbufs should be validated before assuming it is correct.

 - Do not allow more than one instance with the same name on cmdline

   If an admin were to add more than one trace instances with the same
   name they all would be created, but only the first one would be
   accessible via tracefs. This used to not be allowed but some
   restructuring of code has since made it possible.

 - Fix the race between subbuf resize and trace_pipe_raw readers

   If a task was reading trace_pipe_raw while another task was changing
   the ring buffer subbuf size, it could crash the reader. The
   trace_pipe_raw readers do get their own copy of the page from the
   buffer, but the code needs some restructuring to not have the resize
   of the subbuffers cause issues.

 - Cap the size of the mapped (static) ring buffer nr_pages

   The meta data used for ring buffer mapped buffers is 32 bit in size.
   A normal ring buffer could (in theory) have more than 4 billion
   pages. But this is not allowed by mapped buffers, so enforce it.

* tag 'trace-v7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Use a macro for static buffer bits
  tracing: Fix comment in tracing_buffers_splice_read()
  ring-buffer: Prevent truncation of nr_pages / nr_subbufs
  ring-buffer: Cap static ring buffer nr_pages
  tracing: Fix subbuf resize races with trace_pipe_raw readers
  tracing: Fix to avoid creating trace instances with duplicate names
  ring-buffer: Add checking nr_subbufs to persistent ring buffer validation
  ring-buffer: Allow splice reads on static buffers
  tracing: Take trace_array reference when opening options file
  ftrace: Synchronize the initialization of ftrace_ops
  ftrace: Take trace_array reference before accessing its ftrace_ops
  tracing: Have show_event_filters/triggers files take trace array ref
2026-09-06 14:21:24 -07:00
Linus Torvalds
2beb1b31a1 bpf-fixes
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Merge tag 'bpf-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

Pull bpf fixes from Alexei Starovoitov:
 "This mainly contains verifier fixes that address bugs reported by
  Nicholas Carlini.

   - Fix incorrect non-NULL inference in pointer comparisons: pointer
     types that may be NULL at runtime, pointers with unbounded offsets,
     JMP32 comparisons with zero, and imprecise zero registers (Eduard
     Zingerman)

   - Fix precision tracking for half-dead zero spills, ld_abs/ld_ind
     implicit subprog exit, bpf_loop() callbacks, linked scalar ids and
     NULL call arguments (Eduard Zingerman)

   - Reject BPF_PSEUDO_FUNC reference to the main program, fix zero
     extension of arena 32-bit cmpxchg, don't rewrite bpf_fastcall
     patterns entered by a jump (Eduard Zingerman)

   - Fix percpu map update and BPF_F_CPU validation with sparse CPU IDs
     (Hui Su)

   - Fix NULL-ptr-derefs in bpf_snprintf_btf() for void and VAR types,
     and reject key-less BTF for hash maps (Jiayuan Chen)

   - Various fixes (Kumar Kartikeya Dwivedi):
       - Fix out-of-bounds access in disassembler on invalid LDSX
         instruction
       - mark siginfo of signal tracepoints as scalar and
         sched_process_wait argument as nullable
       - mark faultable stack helpers as sleepable
       - reject tail calls and legacy packet loads from callbacks
       - enforce rbtree callback lock restrictions for resilient locks
       - require MEM_PERCPU for percpu kptr stores
       - clear NON_OWN_REF after RCU protection ends
       - mark NULL kptr stores precise
       - preserve inner map identity in callback frames
       - reject non-scalar bpf_loop() iteration counts

   - Fix trampoline allocation slowdown on x86 by using
     EXECMEM_MODULE_DATA (Mike Rapoport)

   - Keep bpf_refcount_acquire() nullable for borrowed RCU kptrs and
     reject untrusted allocated-object pointers (Ning Ding)

   - Fix special fields handling in recycled rhtab elements (Nuoqi Gui,
     Yuan Chen)"

* tag 'bpf-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf: (86 commits)
  bpf, riscv: Make arena support depend on ZACAS
  selftests/bpf: Test pointer bpf_loop iteration count rejection
  bpf: Reject non-scalar bpf_loop iteration counts
  bpf: use mark_arg_precision() in check_mem_size_reg()
  bpf: propagate mark_chain_precision() errors out of loop_flag_is_zero()
  selftests/bpf: precision of a NULL global subprogram BTF_ID argument
  bpf: mark a NULL BTF_ID argument of a global subprogram precise
  selftests/bpf: precision of a NULL kfunc argument
  bpf: mark a NULL kfunc argument precise
  selftests/bpf: precision of a NULL global subprogram memory argument
  bpf: mark a NULL memory argument of a call precise
  selftests/bpf: precision of a NULL helper argument
  bpf: mark a NULL call argument precise
  selftests/bpf: Test inner map identities in callbacks
  bpf: Preserve inner map identity in callback frames
  selftests/bpf: Test imprecise scalar kptr stores
  bpf: Mark NULL kptr stores precise
  selftests/bpf: Test rhtab kptr cancellation semantics
  bpf: Cancel special fields when recycling rhtab elements
  selftests/bpf: Test timer field on recycled rhtab element
  ...
2026-09-06 13:49:44 -07:00
Linus Torvalds
88405f0ad1 Miscellaneous scheduler fixes:
- Fix a timestamping bug in pick_task_fair() and
    yield_task_fair() (Zhan Xusheng)
 
  - Skip migrate-disabled tasks when picking a push
    candidate in the RT and DL schedulers (Seiji Nishikawa)
 
  - Skip rq->avg_idle update without a valid idle_stamp
    (Shubhang Kaushik)
 
  - Fix throttling bug in throttle_cfs_rq(), caused
    by the recent single-runqueue conversion (Wanwu Li)
 
  - Fix bandwidth calculation bug in distribute_cfs_runtime(),
    caused by the single-runqueue conversion (Wanwu Li)
 
  - Don't make x86 ITMT enablement depend on debugfs (Mario Limonciello)
 
  - Avoid creating misfits during cache-aware load-balancing
    on hybrid systems (Tim Chen)
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'sched-urgent-2026-09-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler fixes from Ingo Molnar:

 - Fix a timestamping bug in pick_task_fair() and yield_task_fair()
   (Zhan Xusheng)

 - Skip migrate-disabled tasks when picking a push candidate in the
   RT and DL schedulers (Seiji Nishikawa)

 - Skip rq->avg_idle update without a valid idle_stamp (Shubhang
   Kaushik)

 - Fix throttling bug in throttle_cfs_rq(), caused by the recent
   single-runqueue conversion (Wanwu Li)

 - Fix bandwidth calculation bug in distribute_cfs_runtime(),
   caused by the single-runqueue conversion (Wanwu Li)

 - Don't make x86 ITMT enablement depend on debugfs (Mario Limonciello)

 - Avoid creating misfits during cache-aware load-balancing on hybrid
   systems (Tim Chen)

* tag 'sched-urgent-2026-09-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/fair: Avoid creating misfits during cache-aware balancing
  x86/itmt: Don't make ITMT enablement depend on debugfs
  sched/fair: Use cfs_rq->h_curr in distribute_cfs_runtime()
  sched/fair: Use cfs_rq->h_curr in throttle_cfs_rq()
  sched/core: Skip rq->avg_idle update without a valid idle_stamp
  sched/rt,dl: Skip migrate-disabled tasks when picking a push candidate
  sched/fair: Use update_curr_eevdf() for the remaining root cfs_rq callers
2026-09-06 11:08:44 -07:00
Linus Torvalds
c4a3928e7d Misc perf events fixes:
- Skip empty AUX records with only format flags
    (Leo Yan)
 
  - Fix use-after-free when perf mmap() revival races with the
    last munmap() (Yilin Zhang, Weiming Shi)
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'perf-urgent-2026-09-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull perf events fixes from Ingo Molnar:

 - Skip empty AUX records with only format flags (Leo Yan)

 - Fix use-after-free when perf mmap() revival races with the
   last munmap() (Yilin Zhang, Weiming Shi)

* tag 'perf-urgent-2026-09-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf: Fix use-after-free when perf mmap() revival races with the last munmap()
  perf/core: Skip empty AUX records with only format flags
2026-09-06 11:06:09 -07:00
Linus Torvalds
c8990f3179 Misc locking fixes:
- Fix a softirq processing delay bug in local_interrupt_disable(),
    which should mostly only affect the Rust runtime (Boqun Feng)
 
  - Remove the hardirq_disable_count() function which caused the
    previous bug and is now unused & unnecessary (Boqun Feng)
 
  - lockdep: Invalidate stale class_cache entries for zapped classes
    (Eric Dumazet)
 
  - Fix rt_mutex specific futex scheduling helpers
    (Sebastian Andrzej Siewior)
 
  - Fix rcuwait use-after-free race during futex requeue PI (Yao Kai)
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'locking-urgent-2026-09-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull locking fixes from Ingo Molnar:

 - Fix a softirq processing delay bug in local_interrupt_disable(),
   which should mostly only affect the Rust runtime (Boqun Feng)

 - Remove the hardirq_disable_count() function which caused the
   previous bug and is now unused & unnecessary (Boqun Feng)

 - lockdep: Invalidate stale class_cache entries for zapped classes
   (Eric Dumazet)

 - Fix rt_mutex specific futex scheduling helpers
   (Sebastian Andrzej Siewior)

 - Fix rcuwait use-after-free race during futex requeue PI (Yao Kai)

* tag 'locking-urgent-2026-09-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  futex: Prevent rcuwait use-after-free during requeue PI
  futex: Provide rt_mutex_.*_schedule() equivalents for futex scheduling
  locking/lockdep: Invalidate stale class_cache entries for zapped classes
  preempt: Remove hardirq_disable_count()
  interrupt: Disable interrupt before modifying hardirq_disable counter
2026-09-06 10:45:46 -07:00
Linus Torvalds
b485131995 Miscellaneous IRQ subsystem fixes:
- Revert a commit to the mbigen irqchip driver that caused
    a regression on two-port Hi1616 chips (Caina)
 
  - Fix a too-long-preemption-off bug in the stm32mp-exti
    irqchip driver, caused by a time unit ambiguity & mismatch (Ju Nan)
 
  - Remove the now completely unused irq_domain_add_linear()
    inline function (Jiri Slaby)
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'irq-urgent-2026-09-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull IRQ subsystem fixes from Ingo Molnar:

 - Revert a commit to the mbigen irqchip driver that caused
   a regression on two-port Hi1616 chips (Caina)

 - Fix a too-long-preemption-off bug in the stm32mp-exti
   irqchip driver, caused by a time unit ambiguity & mismatch
   (Ju Nan)

 - Remove the now completely unused irq_domain_add_linear()
   inline function (Jiri Slaby)

* tag 'irq-urgent-2026-09-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/stm32mp-exti: Fix the unit of the hwspinlock timeout
  Revert "irqchip/mbigen: Fix mbigen node address layout"
  irqdomain: Delete irq_domain_add_linear()
2026-09-06 10:35:24 -07:00
Linus Torvalds
d3cbb9af72 virtio console fix for 7.3-rc2
Here is a single virtio console fix for 7.3-rc2 to fix a much reported
 regression in 7.3-rc1, sorry about that.  It's not been in linux-next,
 but it has been sent by many different developers to resolve the issue
 and is "obviously" correct.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'tty-7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull virtio console fix from Greg KH:
 "Here is a single virtio console fix for 7.3-rc2 to fix a much reported
  regression in 7.3-rc1, sorry about that. It's not been in linux-next,
  but it has been sent by many different developers to resolve the issue
  and is 'obviously' correct"

* tag 'tty-7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  virtio_console: allocate the port_buffer with the caller's gfp
2026-09-06 09:55:20 -07:00
Linus Torvalds
bf979ab8f2 Staging driver fixes for 7.3-rc2
Here are some small staging driver fixes to resolve some reported bugs
 that have been found, and tested, in a few staging drivers in 7.3-rc1.
 Included in here are:
   - OOB read problem fixes in the rtl8723bs driver
   - fbtft driver fix
   - sm750fb driver fix
 
 All of these have been in linux-next this week with no reported
 problems.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'staging-7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

Pull staging driver fixes from Greg KH:
 "Here are some small staging driver fixes to resolve some reported bugs
  that have been found, and tested, in a few staging drivers in 7.3-rc1.
  Included in here are:

   - OOB read problem fixes in the rtl8723bs driver

   - fbtft driver fix

   - sm750fb driver fix

  All of these have been in linux-next this week with no reported
  problems"

* tag 'staging-7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  staging: sm750fb: fix mono image source stride mismatch in lynxfb_ops_imageblit()
  staging: rtl8723bs: fix OOB read in rtw_restruct_wmm_ie()
  staging: rtl8723bs: fix OOB read in rtw_action_frame_parse()
  staging: rtl8723bs: fix OOB read / stack overflow in rtw_get_wps_attr()
  staging: fbtft: make dirty_lock IRQ-safe
2026-09-06 09:49:06 -07:00
Linus Torvalds
65538a8f02 USB fixes for 7.3-rc2
Here are some small USB driver fixes for reported problems and
 regressions.  Include in here are:
   - xhci driver fixes
   - cdns3 driver fixes
   - usb gadget driver fixes for syzbot found problems
   - typec driver fixes for broken hardware and other bugs found
   - kernel data leaks in mdc800 driver
   - usb storage driver fixes
   - other small USB driver fixes
 
 All of these have been in linux-next this week with no reported issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'usb-7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb

Pull USB fixes from Greg KH:
 "Here are some small USB driver fixes for reported problems and
  regressions. Include in here are:

   - xhci driver fixes

   - cdns3 driver fixes

   - usb gadget driver fixes for syzbot found problems

   - typec driver fixes for broken hardware and other bugs found

   - kernel data leaks in mdc800 driver

   - usb storage driver fixes

   - other small USB driver fixes

  All of these have been in linux-next this week with no reported
  issues"

* tag 'usb-7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (25 commits)
  usb: typec: qcom-pmic-typec: drain cc_debounce_dwork if port_start() fails
  usb: typec: qcom-pmic-typec: disable cc_debounce_dwork on stop
  usb: gadget: fix null pointer dereference in usb_put_function_instance()
  usb: typec: qcom-pmic: cancel reset_work on stop
  usb: gadget: f_mass_storage: fix null pointer dereference in fsg_common_set_num_buffers()
  usb: f_mass_storage: Bump local buffer size in fsg_common_create_luns()
  usb: storage: realtek_cr: fix use-after-free on disconnect
  usb: cdnsp: fix wakeup from S3 after controller context loss
  usb-storage: ene_ub6250: fix race between scan work and probe
  USB: gadget: fix NULL pointer dereference in gadget_dev_ioctl()
  usb: gadget: f_midi: initialize work in f_midi_alloc()
  usb: gadget: f_midi2: fix use-after-free in string attribute show path
  usb: typec: tipd: Fix Thunderbolt altmode VDOs for cd321x
  usb: gadget: midi2: Fix null-pointer dereference in f_midi2_free_ep_reqs
  usb: typec: hd3ss3220: track VBUS enable state per consumer
  usb: dwc3: clear forceRM when issuing EndTransfer
  usb: dwc3: google: Initialise probe properties with DWC3_DEFAULT_PROPERTIES
  usb: typec: mux: avoid duplicated mux switches
  usb: typec: mux: Fix typec_switch_match()
  usb: image: mdc800: change kmalloc() to kzalloc()
  ...
2026-09-06 08:50:20 -07:00
Chen Pei
536b523b40
bpf, riscv: Make arena support depend on ZACAS
The arena range tree allocates its nodes with kmalloc_nolock() since
commit f8c67d8550 ("bpf: Use kmalloc_nolock() in range tree").
kmalloc_nolock() requires slab caches with cmpxchg128 support
(__CMPXCHG_DOUBLE); on riscv cmpxchg128 is provided by the ZACAS
extension. On systems without ZACAS every arena map creation fails
with a misleading -ENOMEM.

Report the missing support instead: make bpf_jit_supports_arena()
return system_has_cmpxchg128() where it is defined, so arena map
creation fails with -EOPNOTSUPP on systems without ZACAS. The macro
is only defined when both CONFIG_RISCV_ISA_ZACAS and
CONFIG_TOOLCHAIN_HAS_ZACAS are enabled, so guard it with #ifdef the
same way mm/slab.h consumes it, and reject arena otherwise. This
matches how arena BPF_CMPXCHG instructions are already gated on ZACAS
in bpf_jit_supports_insn().

Fixes: f8c67d8550 ("bpf: Use kmalloc_nolock() in range tree")
Signed-off-by: Chen Pei <cp0613@linux.alibaba.com>
Acked-by: Pu Lehui <pulehui@huawei.com>
Acked-by: Björn Töpel <bjorn@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/bpf/20260902061451.1416-1-cp0613@linux.alibaba.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
2026-09-06 16:23:12 +02:00
Eduard Zingerman
fd5348b434 Merge branch 'fix-bpf_loop-syzbot-report'
Kumar Kartikeya Dwivedi says:

====================
Fix bpf_loop syzbot report

Needs Eduard's ack. Fix for the report in
https://lore.kernel.org/bpf/6a9ad24c.b5d4176b.238c3e.0001.GAE@google.com.
====================

Link: https://patch.msgid.link/20260905014735.1452988-1-memxor@gmail.com
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
2026-09-05 20:50:13 -07:00
Kumar Kartikeya Dwivedi
bde8901ea1 selftests/bpf: Test pointer bpf_loop iteration count rejection
Add a verifier test that leaves the raw tracepoint context pointer in R1
when calling bpf_loop(). This is the smallest trigger for the incorrect
precision backtracking: it reuses an existing callback and needs no maps or
userspace setup.

Expect an ordinary scalar-type rejection. Without the verifier fix, the
test instead reaches precision backtracking and reports an internal
"backtracking misuse" error.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://patch.msgid.link/20260905014735.1452988-3-memxor@gmail.com
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
2026-09-05 20:50:13 -07:00
Kumar Kartikeya Dwivedi
c3fd8e5fd1 bpf: Reject non-scalar bpf_loop iteration counts
bpf_loop() declares its nr_loops argument as ARG_ANYTHING. Privileged
programs may pass pointer values to such arguments, so check_func_arg()
lets a pointer-valued R1 reach the helper-specific checks.

Since commit bb124da69c ("bpf: keep track of max number of bpf_loop
callback iterations"), the verifier marks R1 precise and reads its upper
bound to limit callback simulation. Precision backtracking only accepts
scalar registers, so passing a pointer instead triggers the "backtracking
misuse" verifier warning. Kernels with panic_on_warn enabled subsequently
panic.

Introduce ARG_SCALAR for helper arguments that only accept scalar values
and use it for bpf_loop() nr_loops. Generic helper argument validation then
rejects pointers before loop inlining and precision processing.

Fixes: bb124da69c ("bpf: keep track of max number of bpf_loop callback iterations")
Reported-by: syzbot+7b47f87674e9a1569110@syzkaller.appspotmail.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://patch.msgid.link/20260905014735.1452988-2-memxor@gmail.com
Closes: https://lore.kernel.org/bpf/6a9ad24c.b5d4176b.238c3e.0001.GAE@google.com/
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
2026-09-05 20:50:13 -07:00
Linus Torvalds
1fc5a74b10 kmalloc_obj conversions for v7.3-rc2
- Run scripts/coccinelle/api/kmalloc_objs.cocci for v7.3
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Merge tag 'kmalloc_obj-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull kmalloc_obj conversions from Kees Cook:
 "Another run of the Coccinelle script for converting kmalloc()
  family of allocations to kmalloc_obj() via the existing rules
  in scripts/coccinelle/api/kmalloc_objs.cocci"

* tag 'kmalloc_obj-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  treewide: refresh kmalloc_obj() conversions
  drm/amd/display: Fix harmless type mismatch in allocation
2026-09-05 20:45:18 -07:00
Linus Torvalds
9f0346dcbe Driver core fixes for 7.3-rc2
- Fix kernfs listxattr() not returning security xattr names (e.g.
   SELinux labels) when the kernfs node has no allocated kernfs_iattrs
 
 - Fix silent truncation of IRQ vector indices in the Rust PCI
   abstractions
 
 - Don't select OF from DRIVER_PE_KUNIT_TEST; skip the test when OF is
   disabled instead of silently enabling extra kernel functionality
 
 - Russ Weight is retiring from kernel development; update the Firmware
   Loader sysfs contact to the driver-core mailing list, add a CREDITS
   entry for Firmware Upload, and update MAINTAINERS accordingly
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Merge tag 'driver-core-7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core

Pull driver core fixes from Danilo Krummrich:

 - Fix kernfs listxattr() not returning security xattr names (e.g.
   SELinux labels) when the kernfs node has no allocated kernfs_iattrs

 - Fix silent truncation of IRQ vector indices in the Rust PCI
   abstractions

 - Don't select OF from DRIVER_PE_KUNIT_TEST; skip the test when OF is
   disabled instead of silently enabling extra kernel functionality

 - Russ Weight is retiring from kernel development; update the Firmware
   Loader sysfs contact to the driver-core mailing list, add a CREDITS
   entry for Firmware Upload, and update MAINTAINERS accordingly

* tag 'driver-core-7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core:
  MAINTAINERS: Remove Russ Weight from Firmware Loader
  CREDITS: Add CREDITS entry for Firmware Upload
  firmware_loader: Change contact for sysfs nodes
  rust: pci: reject IRQ vector indices that do not fit in u32
  kernfs: preserve security xattrs without allocating iattrs
  drivers: base: test: DRIVER_PE_KUNIT_TEST should not select OF
2026-09-05 11:59:05 -07:00
Linus Torvalds
214f4aeb22 LoongArch fixes for v7.3-rc2
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Merge tag 'loongarch-fixes-7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson

Pull LoongArch fixes from Huacai Chen:

 - Fix build errors when RUST and KASAN enabled

 - fix a typo in comment of vmlinux.lds.S

 - fix several bugs in Kprobes, BPF JIT and KVM support

* tag 'loongarch-fixes-7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson:
  perf build: Add clang and rust target flags for LoongArch
  LoongArch: KVM: Fix TOCTOU race on pv_features
  LoongArch: KVM: Validate MSI data before routing it to EIOINTC
  LoongArch: KVM: Preserve memslot arch flags on KVM_MR_FLAGS_ONLY
  LoongArch: KVM: Remove unused function kvm_arch_flush_remote_tlbs_memslot()
  LoongArch: KVM: Fix resource leak in kvm_loongarch_env_init() error path
  LoongArch: KVM: Add unregister helpers for the KVM interrupt devices
  LoongArch: KVM: Free init resources if kvm_init() fails
  LoongArch: BPF: Fix off-by-one error for insn_is_cast_user()
  LoongArch: Avoid preempt count underflow without probe
  LoongArch: Do not save/restore percpu base register in rethook trampoline
  LoongArch: Remove unused setup_profiling_timer() function
  LoongArch: Fix typo "avaliable" in comment of vmlinux.lds.S
  LoongArch: Do not select HAVE_RUST when KASAN is enabled
2026-09-05 10:45:51 -07:00
Breno Leitao
b144dc5a24 virtio_console: allocate the port_buffer with the caller's gfp
put_chars() runs from the hvc console write path with preemption
disabled, so it asks alloc_buf() for GFP_ATOMIC. Only the data buffer
gets it: the struct port_buffer itself keeps the GFP_KERNEL default, so
the allocation can enter direct reclaim and sleep. A write to /dev/kmsg
on a CONFIG_DEBUG_ATOMIC_SLEEP kernel splats:

  BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:320
  in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 1, name: virtme-ng-init
  preempt_count: 1, expected: 0
  Preemption disabled at:
  [<ffffffff813fd90d>] vprintk_emit+0x17d/0x510
  Call Trace:
   <TASK>
   dump_stack_lvl+0x69/0xa0
   __might_resched+0x37a/0x4d0
   __kmalloc_cache_noprof+0x94/0x5f0
   put_chars+0x209/0x3e0
   hvc_console_print+0x234/0x640
   console_flush_all+0x4fc/0x950
   console_unlock+0xbf/0x1b0
   vprintk_emit+0x312/0x510
   devkmsg_emit+0xba/0x110
   devkmsg_write+0x21b/0x2e0
   vfs_write+0x4dc/0x9d0
   ksys_write+0x108/0x1e0
   do_syscall_64+0xfa/0x460
   </TASK>

Pass gfp on to that allocation too.

Fixes: fc220d6be3 ("virtio_console: refactor __send_to_port() buffer ownership")
Signed-off-by: Breno Leitao <leitao@debian.org>
Acked-by: Sungho Bae <baver.bae@lge.com>
Tested-by: Florian Westphal <fw@strlen.de>
Link: https://patch.msgid.link/20260810-serial-v1-1-abbe51602c13@debian.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2026-09-05 19:28:39 +02:00
Linus Torvalds
d9d80a859b for-7.3-rc1-tag
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Merge tag 'for-7.3-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs fixes from David Sterba:

 - preserve inode compression level when changing attributes

 - fix lost wakeup when waiting for a zstd workspace

 - fix bio context leaks after ordered extent processing errors

 - in send, handle unexpected extents for non-regular inodes

 - handle edge case in creation of reloc tree with enabled quotas

 - in scrub report the exact failing offset, not the stripe base

 - error handling fixes
     - error code propagation in send, zoned mode and raid-stripe-tree
     - restore active device pointer after seeding device addition error
     - transaction abort fixups

 - update Chris' email address

* tag 'for-7.3-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  MAINTAINERS: update Chris Mason's email address
  btrfs: tests: do not touch page cache if root/inode allocation failed
  btrfs: zstd: fix lost wakeup when waiting for a workspace
  btrfs: do not force reloc root creation during qgroup_account_snapshot()
  btrfs: send: fix lost error return value in will_overwrite_ref()
  btrfs: abort transaction before releasing tree_log_mutex on commit failure
  btrfs: zoned: propagate do_zone_finish() error in btrfs_zone_finish_endio()
  btrfs: zoned: finish active block group cleanup if call_zone_finish() fails
  btrfs: send: reject extents for non-regular inodes
  btrfs: return proper negative error code for update_raid_extent_item()
  btrfs: fix the possible bioc_list memory leak during error
  btrfs: fix transaction use-after-free in raid stripe insertion
  btrfs: scrub: report the failing sector's address, not the stripe base
  btrfs: preserve the compression property when other inode flags change
  btrfs: restore active device pointers after failed sprout
  btrfs: detach failed sprout device from transaction update list
  btrfs: clean up target device if block group marking fails
2026-09-05 10:18:21 -07:00
Linus Torvalds
0d9ff90a54 SCSI fixes on 20260905
2 enhancements to add support and MCQ for additional Intel 4.0
 controller types. The rest are all driver fixes, the largest of which is
 the mpi3mr target use after free fix, follwed by a similar TOCTOU fix
 for io_uring passthrough in bsg.
 
 Signed-off-by: James E.J. Bottomley <James.Bottomley@HansenPartnership.com>
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Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

Pull SCSI fixes from James Bottomley:
 "Two enhancements to add support and MCQ for additional Intel 4.0
  controller types.

  The rest are all driver fixes, the largest of which is the mpi3mr
  target use after free fix, follwed by a similar TOCTOU fix for
  io_uring passthrough in bsg"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: megaraid_sas: Limit NVMe request size to the PRP chain frame
  scsi: bsg: Fix TOCTOU in io_uring passthrough command setup
  scsi: bsg: Cap io_uring sense copy to max_response_len
  scsi: mpt3sas: Avoid out-of-bounds cpumask_of_node() call in _base_assign_reply_queues()
  scsi: mpi3mr: Fix use-after-free on tgt_dev->starget during target device refresh/update
  scsi: target: iscsi: Reserve a terminator byte for the login payload
  scsi: target: iscsi: Fix hang for aborted WRITE_PENDING commands
  scsi: ufs: ufs-pci: Add MCQ support for Intel UFS 4.0 controllers
  scsi: ufs: ufs-pci: Add support for Intel UFS 4.0 HS-Gear5
  scsi: sg: Report request-table problems when any status is set
  scsi: mpi3mr: Fix target device refcount leak in mpi3mr_sas_port_add()
  scsi: mpi3mr: Fix NULL pointer dereference in mpi3mr_sas_port_add()
  scsi: ufs: ufs-qcom: Fix sequential read variance
  scsi: ufs: ufs-qcom: Restore HS/LS link startup mode for Qualcomm UFS controller v6.2+
  scsi: ibmvfc: Document protocol parameter of ibmvfc_alloc_target()
  scsi: ibmvfc: Fix kernel-doc name for ibmvfc_scsi_relogin()
  scsi: pm8001: Use rollback index when freeing MSI-X vectors
  scsi: fnic: Initialize the NVMe local port info before registering
2026-09-05 09:25:50 -07:00
Linus Torvalds
d0fc310b4d block-7.3-20260905
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Merge tag 'block-7.3-20260905' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux

Pull block fixes from Jens Axboe:

 - NVMe fixes via Keith:
     - nvme-tcp fixes for an out-of-bounds write on an over-long PDU
     - nvmet-tcp, nvmet-rdma and nvme-rdma leak and cleanup-ordering
       fixes
     - FDP placement id array racy access fix
     - nvme-fc double free of fabrics options on nvme_add_ctrl()
       failure, and a secret leak failure
     - Fault injection opcode filtering
     - stale namespace removal during scan
     - Various other smaller fixes and cleanups

 - Flag zoned disks with GENHD_FL_NO_PART

 - Save the page offset gaps in a cloned bio

 - Fix dma_alignment for large or unreported limits in loop and zloop

 - Clear VM_MAYWRITE on a read-only ublk char device mmap

* tag 'block-7.3-20260905' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux: (25 commits)
  nvme-tcp.h: drop kernel-doc comments, fix a few descriptions
  nvme-fc: fix double free of fabrics options when nvme_add_ctrl() fails
  nvmet: reject namespace enable without device path
  nvmet-auth: Synchronize timeout work during SQ teardown
  MAINTAINERS: update nvme entry
  nvmet-tcp: reject unsolicited H2CData PDUs
  nvme-tcp: defer TLS inline send to io_work
  nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU
  nvme-tcp: return -EPROTO for a C2HData on a write
  nvmet: print namespace IDs as unsigned 32bit value
  nvme: print namespace IDs as unsigned 32bit value
  nvme: remove stale namespaces by NSID range during scan
  nvme: add missing SRCU grace period in error path
  nvme-fabrics: fix DHCHAP secret leak on parse failure
  ublk: clear VM_MAYWRITE on read-only ublk char device mmap
  loop, zloop: fix dma_alignment for large or unreported limits
  block: save page offset gaps in cloned bio
  block: flag zoned disks with GENHD_FL_NO_PART
  nvmet-rdma: fix queue leak when connect backlog is exceeded
  nvme: add opcode filtering for fault injection
  ...
2026-09-05 08:58:55 -07:00