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superna9999 and others added 30 commits January 28, 2024 11:55
The TLMM gpio74 is also used to communicate with the secure NFC
on-board module, some variants of the SM8650-QRD board requires
this GPIO to be dedicated to the secure firmware and set reserved
in order to successfully initialize the TLMM GPIOs from HLOS (Linux).
On the other boards this GPIO is unused so it's still safe to mark
the GPIO as reserved.

Fixes: a834911 ("arm64: dts: qcom: sm8650: add initial SM8650 QRD dts")
Reported-by: Georgi Djakov <djakov@kernel.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Elliot Berman <quic_eberman@quicinc.com>
Link: https://lore.kernel.org/r/20240111-topic-sm8650-upstream-qrd-fix-gpio-reserved-v1-1-fad39b4c5def@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
The TLMM gpio74 is also used to communicate with the secure NFC
on-board module, some variants of the SM8650-MTP board requires
this GPIO to be dedicated to the secure firmware and set reserved
in order to successfully initialize the TLMM GPIOs from HLOS (Linux).
On the other boards this GPIO is unused so it's still safe to mark
the GPIO as reserved.

Fixes: 6fbdb3c ("arm64: dts: qcom: sm8650: add initial SM8650 MTP dts")
Reported-by: Georgi Djakov <djakov@kernel.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Tested-by: Georgi Djakov <quic_c_gdjako@quicinc.com>
Reviewed-by: Elliot Berman <quic_eberman@quicinc.com>
Link: https://lore.kernel.org/r/20240111-topic-sm8650-upstream-qrd-fix-gpio-reserved-v1-2-fad39b4c5def@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Commit b3eaa47 ("arm64: dts: qcom: sm6115: Hook up interconnects")
did indeed hook up interconnects, but apparently not interconnect-names
on I2C1, making it return -EINVAL due to an error getting icc paths..

Fix it!

Fixes: b3eaa47 ("arm64: dts: qcom: sm6115: Hook up interconnects")
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20240202-topic-6115_i2c-v1-1-ecfe06f5f2ef@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
The PHY is configured in 10GBASE-R, so make sure to reflect that in DT.

Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
The MGBE power-domains on Tegra234 are mapped to the MGBE controllers as
follows:

 MGBE0 (0x68000000) --> Power-Domain MGBEB
 MGBE1 (0x69000000) --> Power-Domain MGBEC
 MGBE2 (0x6a000000) --> Power-Domain MGBED

Update the device-tree nodes for Tegra234 to correct this.

Fixes: 610cdf3 ("arm64: tegra: Add MGBE nodes on Tegra234")
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Since commit bfac19e ("fbdev: mx3fb: Remove the driver") backlight
is no longer functional.

The fbdev mx3fb driver used to automatically select
CONFIG_BACKLIGHT_CLASS_DEVICE.

Now that the mx3fb driver has been removed, enable the
CONFIG_BACKLIGHT_CLASS_DEVICE option so that backlight can still work
by default.

Tested on a imx6dl-sabresd board.

Cc: stable@vger.kernel.org
Fixes: bfac19e ("fbdev: mx3fb: Remove the driver")
Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Tested-by: Francesco Dolcini <francesco.dolcini@toradex.com> # Toradex Colibri iMX7
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Orange Pi Zero 2W dts file is not included in Makefile. Fix this.

Fixes: c505ee1 ("arm64: dts: allwinner: h616: add Orange Pi Zero 2W support")
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Link: https://lore.kernel.org/r/20240222211326.114955-1-jernej.skrabec@gmail.com
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
This fixes the display not working on colibri imx7, the driver fails to
load with the following error:

  mxsfb 30730000.lcdif: error -ENODEV: Cannot connect bridge

NXP i.MX7 LCDIF is connected to both the Parallel LCD Display and to a
MIPI DSI IP block, currently it's not possible to describe the
connection to both.

Remove the port endpoint from the SOC dtsi to prevent regressions, this
would need to be defined on the board DTS.

Reported-by: Hiago De Franco <hiagofranco@gmail.com>
Closes: https://lore.kernel.org/r/34yzygh3mbwpqr2re7nxmhyxy3s7qmqy4vhxvoyxnoguktriur@z66m7gvpqlia/
Fixes: edbbae7 ("ARM: dts: imx7: add MIPI-DSI support")
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
So far we used an internal linux-imx@nxp.com email address to
gather all patches related to NXP i.MX development.

Let's switch to an open mailing list that provides ability
for people from the community to subscribe and also have
a proper archive.

List interface at: https://lists.linux.dev.
Archive is at: https://lore.kernel.org/imx/

Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
The TC9595 reset GPIO is SAI1_RXC / GPIO4_IO01, fix the DT accordingly.
The SAI5_RXD0 / GPIO3_IO21 is thus far unused TC9595 interrupt line.

Fixes: 20d0b83 ("arm64: dts: imx8mp: Add TC9595 bridge on DH electronics i.MX8M Plus DHCOM")
Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
The "media_ldb_root_clk" is the gate clock to enable or disable the clock
provided by CCM(Clock Control Module) to LDB instead of the "media_ldb"
clock which is the parent of the "media_ldb_root_clk" clock as a composite
clock.  Fix LDB clocks property by referencing the "media_ldb_root_clk"
clock instead of the "media_ldb" clock.

Fixes: e756784 ("arm64: dts: imx8mp: Reorder clock and reg properties")
Fixes: 94e6197 ("arm64: dts: imx8mp: Add LCDIF2 & LDB nodes")
Signed-off-by: Liu Ying <victor.liu@nxp.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
sun8i_ce_cipher_unprepare should be called before
crypto_finalize_skcipher_request, because client callbacks may
immediately free memory, that isn't needed anymore. But it will be
used by unprepare after free. Before removing prepare/unprepare
callbacks it was handled by crypto engine in crypto_finalize_request.

Usually that results in a pointer dereference problem during a in
crypto selftest.
 Unable to handle kernel NULL pointer dereference at
                                      virtual address 0000000000000030
 Mem abort info:
   ESR = 0x0000000096000004
   EC = 0x25: DABT (current EL), IL = 32 bits
   SET = 0, FnV = 0
   EA = 0, S1PTW = 0
   FSC = 0x04: level 0 translation fault
 Data abort info:
   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
 user pgtable: 4k pages, 48-bit VAs, pgdp=000000004716d000
 [0000000000000030] pgd=0000000000000000, p4d=0000000000000000
 Internal error: Oops: 0000000096000004 [#1] SMP

This problem is detected by KASAN as well.
 ==================================================================
 BUG: KASAN: slab-use-after-free in sun8i_ce_cipher_do_one+0x6e8/0xf80 [sun8i_ce]
 Read of size 8 at addr ffff00000dcdc040 by task 1c15000.crypto-/373

 Hardware name: Pine64 PinePhone (1.2) (DT)
 Call trace:
  dump_backtrace+0x9c/0x128
  show_stack+0x20/0x38
  dump_stack_lvl+0x48/0x60
  print_report+0xf8/0x5d8
  kasan_report+0x90/0xd0
  __asan_load8+0x9c/0xc0
  sun8i_ce_cipher_do_one+0x6e8/0xf80 [sun8i_ce]
  crypto_pump_work+0x354/0x620 [crypto_engine]
  kthread_worker_fn+0x244/0x498
  kthread+0x168/0x178
  ret_from_fork+0x10/0x20

 Allocated by task 379:
  kasan_save_stack+0x3c/0x68
  kasan_set_track+0x2c/0x40
  kasan_save_alloc_info+0x24/0x38
  __kasan_kmalloc+0xd4/0xd8
  __kmalloc+0x74/0x1d0
  alg_test_skcipher+0x90/0x1f0
  alg_test+0x24c/0x830
  cryptomgr_test+0x38/0x60
  kthread+0x168/0x178
  ret_from_fork+0x10/0x20

 Freed by task 379:
  kasan_save_stack+0x3c/0x68
  kasan_set_track+0x2c/0x40
  kasan_save_free_info+0x38/0x60
  __kasan_slab_free+0x100/0x170
  slab_free_freelist_hook+0xd4/0x1e8
  __kmem_cache_free+0x15c/0x290
  kfree+0x74/0x100
  kfree_sensitive+0x80/0xb0
  alg_test_skcipher+0x12c/0x1f0
  alg_test+0x24c/0x830
  cryptomgr_test+0x38/0x60
  kthread+0x168/0x178
  ret_from_fork+0x10/0x20

 The buggy address belongs to the object at ffff00000dcdc000
  which belongs to the cache kmalloc-256 of size 256
 The buggy address is located 64 bytes inside of
  freed 256-byte region [ffff00000dcdc000, ffff00000dcdc100)

Signed-off-by: Andrey Skvortsov <andrej.skvortzov@gmail.com>
Fixes: 4136212 ("crypto: sun8i-ce - Remove prepare/unprepare request")
Cc: <stable@vger.kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
The unprepare call must be carried out before the finalize call
as the latter can free the request.

Fixes: c66c17a ("crypto: rk3288 - Remove prepare/unprepare request")
Reported-by: Andrey Skvortsov <andrej.skvortzov@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Andrey Skvortsov <andrej.skvortzov@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Limit the WiFi PCIe link speed to Gen2 speed (500 MB/s), which is the
speed that Windows uses.

Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20240223152124.20042-7-johan+linaro@kernel.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Limit the WiFi PCIe link speed to Gen2 speed (500 MB/s), which is the
speed that the boot firmware has brought up the link at (and that
Windows uses).

This is specifically needed to avoid a large amount of link errors when
restarting the link during boot (but which are currently not reported).

This also appears to fix intermittent failures to download the ath11k
firmware during boot which can be seen when there is a longer delay
between restarting the link and loading the WiFi driver (e.g. when using
full disk encryption).

Fixes: 123b30a ("arm64: dts: qcom: sc8280xp-x13s: enable WiFi controller")
Cc: stable@vger.kernel.org      # 6.2
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20240223152124.20042-8-johan+linaro@kernel.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Commit 09896da ("arm64: dts: qcom: msm8996: Hook up MPM") has
hooked up the MPM irq chip on the MSM8996 platform. However this causes
my Dragonboard 820c crash during bootup (usually when probing IOMMUs).
Revert the offending commit for now. Quick debug shows that making
tlmm's wakeup-parent point to the MPM is enough to trigger the crash.

Fixes: 09896da ("arm64: dts: qcom: msm8996: Hook up MPM")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20240221-msm8996-revert-mpm-v1-1-cdca9e30c9b4@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
The error path while failing to register devices on the TEE bus has a
bug leading to kernel panic as follows:

[   15.398930] Unable to handle kernel paging request at virtual address ffff07ed00626d7c
[   15.406913] Mem abort info:
[   15.409722]   ESR = 0x0000000096000005
[   15.413490]   EC = 0x25: DABT (current EL), IL = 32 bits
[   15.418814]   SET = 0, FnV = 0
[   15.421878]   EA = 0, S1PTW = 0
[   15.425031]   FSC = 0x05: level 1 translation fault
[   15.429922] Data abort info:
[   15.432813]   ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000
[   15.438310]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
[   15.443372]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[   15.448697] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000d9e3e000
[   15.455413] [ffff07ed00626d7c] pgd=1800000bffdf9003, p4d=1800000bffdf9003, pud=0000000000000000
[   15.464146] Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP

Commit 7269cba ("tee: optee: Fix supplicant based device enumeration")
lead to the introduction of this bug. So fix it appropriately.

Reported-by: Mikko Rapeli <mikko.rapeli@linaro.org>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218542
Fixes: 7269cba ("tee: optee: Fix supplicant based device enumeration")
Cc: stable@vger.kernel.org
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
…inux/kernel/git/sunxi/linux into arm/fixes

- include Orange Pi Zero 2W DT in Makefile

* tag 'sunxi-fixes-for-6.8-1' of https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux:
  arm64: dts: allwinner: h616: Add Orange Pi Zero 2W to Makefile

Link: https://lore.kernel.org/r/20240223205450.GA8881@jernej-laptop
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
…m/linux/kernel/git/qcom/linux into arm/fixes

Qualcomm ARM64 DeviceTree fixes for 6.8

This marks an additional GPIO as protected on SM8650 devices, to avoid
a system reset caused by a security violation with some firmware
versions.

It also adds the missing interconnect-names, which resolves a regression
where one of the I2C busses on SM6115 devices would no longer probe in
Linux.

* tag 'qcom-arm64-fixes-for-6.8' of https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux:
  arm64: dts: qcom: sm6115: Fix missing interconnect-names
  arm64: dts: qcom: sm8650-mtp: add gpio74 as reserved gpio
  arm64: dts: qcom: sm8650-qrd: add gpio74 as reserved gpio

Link: https://lore.kernel.org/r/20240225025205.479589-1-andersson@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
…nel/git/shawnguo/linux into arm/fixes

i.MX fixes for 6.8, round 2:

- Update MAINTAINERS to use a public mailing list for NXP i.MX
  development.
- Re-enable CONFIG_BACKLIGHT_CLASS_DEVICE in imx_v6_v7_defconfig to fix
  a backlight regression.
- Remove DSI port endpoints from i.MX7 SoC DTSI to fix a display
  regression.
- Fix LDB clocks property for i.MX8MP device tree.
- Fix TC9595 reset GPIO on DH i.MX8M Plus DHCOM SoM.

* tag 'imx-fixes-6.8-2' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux:
  arm64: dts: imx8mp: Fix LDB clocks property
  arm64: dts: imx8mp: Fix TC9595 reset GPIO on DH i.MX8M Plus DHCOM SoM
  MAINTAINERS: Use a proper mailinglist for NXP i.MX development
  ARM: dts: imx7: remove DSI port endpoints
  ARM: imx_v6_v7_defconfig: Restore CONFIG_BACKLIGHT_CLASS_DEVICE

Link: https://lore.kernel.org/r/ZdtPJzdenRybI+Bq@dragon
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
…nux/kernel/git/tegra/linux into arm/fixes

arm64: tegra: Device tree fixes for v6.8

This contains two fixes to make the MGBE Ethernet devices found on
Tegra234 work properly.

* tag 'tegra-for-6.8-arm64-dt' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux:
  arm64: tegra: Fix Tegra234 MGBE power-domains
  arm64: tegra: Set the correct PHY mode for MGBE

Link: https://lore.kernel.org/r/20240226144536.1525704-1-thierry.reding@gmail.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
…wiklander/linux-tee into arm/fixes

Fix kernel panic in OP-TEE driver

* tag 'optee-fix-for-v6.8' of https://git.linaro.org/people/jens.wiklander/linux-tee:
  tee: optee: Fix kernel panic caused by incorrect error handling

Link: https://lore.kernel.org/r/20240304132727.GA3501807@rayden
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
cocci warnings: (new ones prefixed by >>)
>> drivers/firmware/microchip/mpfs-auto-update.c:387:72-78:
   ERROR: application of sizeof to pointer
   drivers/firmware/microchip/mpfs-auto-update.c:170:72-78:
   ERROR: application of sizeof to pointer

response_msg is a pointer to u32, so the size of element it points to is
supposed to be a multiple of sizeof(u32), rather than sizeof(u32 *).

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202403040516.CYxoWTXw-lkp@intel.com/
Signed-off-by: Dawei Li <dawei.li@shingroup.cn>
Fixes: ec5b0f1 ("firmware: microchip: add PolarFire SoC Auto Update support")
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Patch "fs/aio: Make io_cancel() generate completions again" is based on the
assumption that calling kiocb->ki_cancel() does not complete R/W requests.
This is incorrect: the two drivers that call kiocb_set_cancel_fn() callers
set a cancellation function that calls usb_ep_dequeue(). According to its
documentation, usb_ep_dequeue() calls the completion routine with status
-ECONNRESET. Hence this revert.

Cc: Benjamin LaHaise <ben@communityfibre.ca>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Avi Kivity <avi@scylladb.com>
Cc: Sandeep Dhavale <dhavale@google.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: stable@vger.kernel.org
Reported-by: syzbot+b91eb2ed18f599dd3c31@syzkaller.appspotmail.com
Fixes: 54cbc05 ("fs/aio: Make io_cancel() generate completions again")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20240304182945.3646109-1-bvanassche@acm.org
Acked-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
The first kiocb_set_cancel_fn() argument may point at a struct kiocb
that is not embedded inside struct aio_kiocb. With the current code,
depending on the compiler, the req->ki_ctx read happens either before
the IOCB_AIO_RW test or after that test. Move the req->ki_ctx read such
that it is guaranteed that the IOCB_AIO_RW test happens first.

Reported-by: Eric Biggers <ebiggers@kernel.org>
Cc: Benjamin LaHaise <ben@communityfibre.ca>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Avi Kivity <avi@scylladb.com>
Cc: Sandeep Dhavale <dhavale@google.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: stable@vger.kernel.org
Fixes: b820de7 ("fs/aio: Restrict kiocb_set_cancel_fn() to I/O submitted via libaio")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20240304235715.3790858-1-bvanassche@acm.org
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
…scm/linux/kernel/git/qcom/linux into arm/fixes

A few more Qualcomm Arm64 DeviceTree fixes for v6.8

This reduces the link speed of the PCIe bus with WiFi-card connected on the
Lenovo ThinkPad X13s and the Qualcomm Compute Reference Device, avoid
link errors and initialization issues reported by users.

It also reverts the enablement of MPM on MSM8996, which is reported to
prevent boards on this platform from booting for some users.

* tag 'qcom-arm64-fixes-for-6.8-2' of https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux:
  Revert "arm64: dts: qcom: msm8996: Hook up MPM"
  arm64: dts: qcom: sc8280xp-x13s: limit pcie4 link speed
  arm64: dts: qcom: sc8280xp-crd: limit pcie4 link speed

Link: https://lore.kernel.org/r/20240306031208.4218-1-andersson@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
…/linux/kernel/git/conor/linux into arm/fixes

RISC-V firmware drivers for v6.9

A single minor fix for an oversized allocation due to sizeof() misuse by
yours truly that came in since I sent my last fixes PR.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>

* tag 'riscv-firmware-for-v6.9' of https://git.kernel.org/pub/scm/linux/kernel/git/conor/linux:
  firmware: microchip: Fix over-requested allocation size

Link: https://lore.kernel.org/r/20240305-vicinity-dumpling-8943ef26f004@spud
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This flag is only set by one single user: the magical core dumping code
that looks up user pages one by one, and then writes them out using
their kernel addresses (by using a BVEC_ITER).

That actually ends up being a huge problem, because while we do use
copy_mc_to_kernel() for this case and it is able to handle the possible
machine checks involved, nothing else is really ready to handle the
failures caused by the machine check.

In particular, as reported by Tong Tiangen, we don't actually support
fault_in_iov_iter_readable() on a machine check area.

As a result, the usual logic for writing things to a file under a
filesystem lock, which involves doing a copy with page faults disabled
and then if that fails trying to fault pages in without holding the
locks with fault_in_iov_iter_readable() does not work at all.

We could decide to always just make the MC copy "succeed" (and filling
the destination with zeroes), and that would then create a core dump
file that just ignores any machine checks.

But honestly, this single special case has been problematic before, and
means that all the normal iov_iter code ends up slightly more complex
and slower.

See for example commit c9eec08 ("iov_iter: Don't deal with
iter->copy_mc in memcpy_from_iter_mc()") where David Howells
re-organized the code just to avoid having to check the 'copy_mc' flags
inside the inner iov_iter loops.

So considering that we have exactly one user, and that one user is a
non-critical special case that doesn't actually ever trigger in real
life (Tong found this with manual error injection), the sane solution is
to just decide that the onus on handling the machine check lines on that
user instead.

Ergo, do the copy_mc_to_kernel() in the core dump logic itself, copying
the user data to a stable kernel page before writing it out.

Fixes: f198274 ("iov_iter: Convert iterate*() to inline funcs")
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Tong Tiangen <tongtiangen@huawei.com>
Link: https://lore.kernel.org/r/20240305133336.3804360-1-tongtiangen@huawei.com
Link: https://lore.kernel.org/all/4e80924d-9c85-f13a-722a-6a5d2b1c225a@huawei.com/
Tested-by: David Howells <dhowells@redhat.com>
Reviewed-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Reported-by: Tong Tiangen <tongtiangen@huawei.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
…herbert/crypto-2.6

Pull crypto fixes from Herbert Xu:
 "Fix potential use-after-frees in rk3288 and sun8i-ce"

* tag 'v6.8-p6' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  crypto: rk3288 - Fix use after free in unprepare
  crypto: sun8i-ce - Fix use after free in unprepare
…nel/git/soc/soc

Pull ARM SoC fixes from Arnd Bergmann:
 "These should be the final fixes for the soc tree for 6.8, as usual
  they mostly deal wtih dts files:

   - Qualcomm fixes for pcie4 on sc8280xp, a revert of msm8996 mpm
     support, sm6115 interconnect and sm8650 gpio.

   - Two fixes for Tegra234 ethernet

   - A Makefile fix to actually build the allwinner based orange pi zero
     2w device tree

   - Fixes for clocks and reset on imx8mp and a DSI display regression
     on imx7.

  The non-DT fixes are:

   - Firmware fixes addressing a kernel panic in op-tee and a minor
     regression in microchip/riscv.

   - A defconfig change to bring back backlight support after a Kconfig
     change"

* tag 'arm-fixes-6.8-3' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc:
  firmware: microchip: Fix over-requested allocation size
  tee: optee: Fix kernel panic caused by incorrect error handling
  Revert "arm64: dts: qcom: msm8996: Hook up MPM"
  arm64: dts: qcom: sc8280xp-x13s: limit pcie4 link speed
  arm64: dts: qcom: sc8280xp-crd: limit pcie4 link speed
  arm64: dts: imx8mp: Fix LDB clocks property
  arm64: dts: imx8mp: Fix TC9595 reset GPIO on DH i.MX8M Plus DHCOM SoM
  MAINTAINERS: Use a proper mailinglist for NXP i.MX development
  ARM: dts: imx7: remove DSI port endpoints
  arm64: dts: allwinner: h616: Add Orange Pi Zero 2W to Makefile
  ARM: imx_v6_v7_defconfig: Restore CONFIG_BACKLIGHT_CLASS_DEVICE
  arm64: tegra: Fix Tegra234 MGBE power-domains
  arm64: tegra: Set the correct PHY mode for MGBE
  arm64: dts: qcom: sm6115: Fix missing interconnect-names
  arm64: dts: qcom: sm8650-mtp: add gpio74 as reserved gpio
  arm64: dts: qcom: sm8650-qrd: add gpio74 as reserved gpio
…ux/kernel/git/vfs/vfs

Pull vfs fixes from Christian Brauner:

 - Get rid of copy_mc flag in iov_iter which really only makes sense for
   the core dumping code so move it out of the generic iov iter code and
   make it coredump's problem. See the detailed commit description.

 - Revert fs/aio: Make io_cancel() generate completions again

   The initial fix here was predicated on the assumption that calling
   ki_cancel() didn't complete aio requests. However, that turned out to
   be wrong since the two drivers that actually make use of this set a
   cancellation function that performs the cancellation correctly. So
   revert this change.

 - Ensure that the test for IOCB_AIO_RW always happens before the read
   from ki_ctx.

* tag 'vfs-6.8-release.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  iov_iter: get rid of 'copy_mc' flag
  fs/aio: Check IOCB_AIO_RW before the struct aio_kiocb conversion
  Revert "fs/aio: Make io_cancel() generate completions again"
@pull pull bot added the ⤵️ pull label Mar 6, 2024
@pull pull bot merged commit 67be068 into souparna21:master Mar 6, 2024
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