| Commit message (Collapse) | Author | Age | Files | Lines |
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git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight
Pull backlight updates from Lee Jones:
"Core Framework:
- Add backlight_device_get_by_name() to the API
New Device Support:
- Add support for WLED5 to Qualcomm WLED
Fix-ups:
- Convert to GPIO descriptors in l4f00242t03
- Device Tree fix-ups for qcom-wled
Bug Fixes:
- Properly disable regulators on .probe() failure"
* tag 'backlight-next-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight:
backlight: Add backlight_device_get_by_name()
backlight: qcom-wled: Add support for WLED5 peripheral that is present on PM8150L PMICs
dt-bindings: backlight: qcom-wled: Add WLED5 bindings
backlight: qcom-wled: Add callback functions
dt-bindings: backlight: qcom-wled: Convert the wled bindings to .yaml format
backlight: l4f00242t03: Convert to GPIO descriptors
backlight: lp855x: Ensure regulators are disabled on probe failure
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Add a way to lookup a backlight device based on its name.
Will be used by a USB display gadget getting the name from configfs.
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Acked-by: Jingoo Han <jingoohan1@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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PM8150L PMICs
PM8150L WLED supports the following:
- Two modulators and each sink can use any of the modulator
- Multiple CABC selection options from which one can be selected/enabled
- Multiple brightness width selection (12 bits to 15 bits)
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Add WLED5 specific bindings.
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Add wled_cabc_config, wled_sync_toggle, wled_ovp_fault_status
and wled_ovp_delay and wled_auto_detection_required callback
functions to prepare the driver for adding WLED5 support.
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Convert the qcom-wled bindings from .txt to .yaml format.
Also replace PM8941 to WLED3 and PMI8998 to WLED4.
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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This converts the l4f00242t03 backlight driver to use GPIO
descriptors and switches the two Freescale i.MX boards over
to passing descriptors instead of global GPIO numbers.
We use the typical names "enable" and "reset" as found in
the device tree bindings for panel GPIOs.
This saves a lot of code in the driver and makes it possible
to get rid of the platform data header altogether.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Acked-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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If probing the LP885x backlight fails after the regulators have been
enabled, then the following warning is seen when releasing the
regulators ...
WARNING: CPU: 1 PID: 289 at drivers/regulator/core.c:2051 _regulator_put.part.28+0x158/0x160
Modules linked in: tegra_xudc lp855x_bl(+) host1x pwm_tegra ip_tables x_tables ipv6 nf_defrag_ipv6
CPU: 1 PID: 289 Comm: systemd-udevd Not tainted 5.6.0-rc2-next-20200224 #1
Hardware name: NVIDIA Jetson TX1 Developer Kit (DT)
...
Call trace:
_regulator_put.part.28+0x158/0x160
regulator_put+0x34/0x50
devm_regulator_release+0x10/0x18
release_nodes+0x12c/0x230
devres_release_all+0x34/0x50
really_probe+0x1c0/0x370
driver_probe_device+0x58/0x100
device_driver_attach+0x6c/0x78
__driver_attach+0xb0/0xf0
bus_for_each_dev+0x68/0xc8
driver_attach+0x20/0x28
bus_add_driver+0x160/0x1f0
driver_register+0x60/0x110
i2c_register_driver+0x40/0x80
lp855x_driver_init+0x20/0x1000 [lp855x_bl]
do_one_initcall+0x58/0x1a0
do_init_module+0x54/0x1d0
load_module+0x1d80/0x21c8
__do_sys_finit_module+0xe8/0x100
__arm64_sys_finit_module+0x18/0x20
el0_svc_common.constprop.3+0xb0/0x168
do_el0_svc+0x20/0x98
el0_sync_handler+0xf4/0x1b0
el0_sync+0x140/0x180
Fix this by ensuring that the regulators are disabled, if enabled, on
probe failure.
Finally, ensure that the vddio regulator is disabled in the driver
remove handler.
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
Pull MFD updates from Lee Jones:
"Core Frameworks:
- Constify 'properties' attribute in core header file
New Drivers:
- Add support for Gateworks System Controller
- Add support for MediaTek MT6358 PMIC
- Add support for Mediatek MT6360 PMIC
- Add support for Monolithic Power Systems MP2629 ADC and Battery charger
Fix-ups:
- Use new I2C API in htc-i2cpld
- Remove superfluous code in sprd-sc27xx-spi
- Improve error handling in stm32-timers
- Device Tree additions/fixes in mt6397
- Defer probe betterment in wm8994-core
- Improve module handling in wm8994-core
- Staticify in stpmic1
- Trivial (spelling, formatting) in tqmx86
Bug Fixes:
- Fix incorrect register/PCI IDs in intel-lpss-pci
- Fix unbalanced Regulator API calls in wm8994-core
- Fix double free() in wcd934x
- Remove IRQ domain on failure in stmfx
- Reset chip on resume in stmfx
- Disable/enable IRQs on suspend/resume in stmfx
- Do not use bulk writes on H/W which does not support them in max77620"
* tag 'mfd-next-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd: (29 commits)
mfd: mt6360: Remove duplicate REGMAP_IRQ_REG_LINE() entry
mfd: Add support for PMIC MT6360
mfd: max77620: Use single-byte writes on MAX77620
mfd: wcd934x: Drop kfree for memory allocated with devm_kzalloc
mfd: stmfx: Disable IRQ in suspend to avoid spurious interrupt
mfd: stmfx: Fix stmfx_irq_init error path
mfd: stmfx: Reset chip on resume as supply was disabled
mfd: wm8994: Silence warning about supplies during deferred probe
mfd: wm8994: Fix unbalanced calls to regulator_bulk_disable()
mfd: wm8994: Fix driver operation if loaded as modules
dt-bindings: mfd: mediatek: Add MT6397 Pin Controller
mfd: Constify properties in mfd_cell
mfd: stm32-timers: Use dma_request_chan() instead dma_request_slave_channel()
mfd: sprd: Remove unnecessary spi_bus_type setting
mfd: intel-lpss: Update LPSS UART #2 PCI ID for Jasper Lake
mfd: tqmx86: Fix a typo in MODULE_DESCRIPTION
mfd: stpmic1: Make stpmic1_regmap_config static
mfd: htc-i2cpld: Convert to use i2c_new_client_device()
MAINTAINERS: Add entry for mp2629 Battery Charger driver
power: supply: mp2629: Add impedance compensation config
...
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Fixes the following build warning:
>> drivers/mfd/mt6360-core.c:148:2: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
REGMAP_IRQ_REG_LINE(MT6360_CHG_TREG_EVT, 8),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/regmap.h:1191:10: note: expanded from macro 'REGMAP_IRQ_REG_LINE'
[_id] = { ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/mfd/mt6360-core.c:124:2: note: previous initialization is here
REGMAP_IRQ_REG_LINE(MT6360_CHG_TREG_EVT, 8),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/regmap.h:1191:10: note: expanded from macro 'REGMAP_IRQ_REG_LINE'
[_id] = { ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Add MFD driver for mt6360 pmic chip include Battery Charger/
USB_PD/Flash, LED/RGB and LED/LDO/Buck
Signed-off-by: Gene Chen <gene_chen@richtek.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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The MAX77620 doesn't support bulk writes, so make sure the regmap code
breaks bulk writes into multiple single-byte writes.
Note that this is mostly cosmetic because currently only the RTC sub-
driver uses bulk writes and the RTC driver ends up using a different
regmap on the MAX77620 anyway. However, it seems like a good idea to
make this change now in order to avoid running into issues if bulk
writes are ever used by other sub-drivers sometime down the road.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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It's not necessary to free memory allocated with devm_kzalloc
and using kfree leads to a double free.
Fixes: 6ac7e4d7ad70 ("mfd: wcd934x: Add support to wcd9340/wcd9341 codec")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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When STMFX supply is stopped, spurious interrupt can occur. To avoid that,
disable the interrupt in suspend before disabling the regulator and
re-enable it at the end of resume.
Fixes: 06252ade9156 ("mfd: Add ST Multi-Function eXpander (STMFX) core driver")
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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In case the interrupt signal can't be configured, IRQ domain needs to be
removed.
Fixes: 06252ade9156 ("mfd: Add ST Multi-Function eXpander (STMFX) core driver")
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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STMFX supply is disabled during suspend. To avoid a too early access to
the STMFX firmware on resume, reset the chip and wait for its firmware to
be loaded.
Fixes: 06252ade9156 ("mfd: Add ST Multi-Function eXpander (STMFX) core driver")
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Don't confuse user with meaningless warning about the failure in getting
supplies in case of deferred probe.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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When runtime PM is enabled, regulators are being controlled by the
driver's suspend and resume callbacks. They are also unconditionally
enabled at driver's probe(), and disabled in remove() functions. Add
more calls to runtime PM framework to ensure that the device's runtime
PM state matches the regulators state:
1. at the end of probe() function: set runtime PM state to active, so
there will be no spurious call to resume();
2. in remove(), ensure that resume() is called before disabling runtime PM
management and unconditionally disabling the regulators.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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WM8994 chip has built-in regulators, which might be used for chip
operation. They are controlled by a separate wm8994-regulator driver,
which should be loaded before this driver calls regulator_get(), because
that driver also provides consumer-supply mapping for the them. If that
driver is not yet loaded, regulator core substitute them with dummy
regulator, what breaks chip operation, because the built-in regulators are
never enabled. Fix this by annotating this driver with MODULE_SOFTDEP()
"pre" dependency to "wm8994_regulator" module.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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The MT6397 mfd includes a pin controller. Add binding
a description for it.
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Constify 'struct property_entry *properties' in mfd_cell.
It is always passed around as a pointer const struct.
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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dma_request_slave_channel() is a wrapper on top of dma_request_chan()
eating up the error code.
By using dma_request_chan() directly the driver can support deferred
probing against DMA.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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The spi_register_driver() will set the spi_bus_type for the spi_driver,
thus remove the redundant setting in this driver.
Signed-off-by: Baolin Wang <baolin.wang7@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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It appears that preliminary documentation has a typo in the ID list,
i.e. LPSS UART #2 had been advertised wrongly.
Fix the driver according to the EDS v0.9.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Based on the file name and code of the driver, it is likely that this
module is related to TQMx86 and not TQx86.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Fix sparse warning:
drivers/mfd/stpmic1.c:62:28: warning:
symbol 'stpmic1_regmap_config' was not declared. Should it be static?
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Move away from the deprecated API and return the shiny new ERRPTR where
useful.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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'ib-mfd-iio-power-5.8' and 'ib-mfd-hwmon-5.8' into ibs-for-mfd-merged
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Add MAINTAINERS entry for Monolithic Power Systems mp2629 Charger driver.
Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Allows the user to compensate the intrinsic resistance of the battery
to accelerate the charging cycle.
Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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The mp2629 provides switching-mode battery charge management for
single-cell Li-ion or Li-polymer battery. Driver supports the
access/control input source and battery charging parameters.
Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Add support for 8-bit resolution ADC readings for input power
supply and battery charging measurement. Provides voltage, current
readings to mp2629 power supply driver.
Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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mp2629 is a highly-integrated switching-mode battery charge management
device for single-cell Li-ion or Li-polymer battery.
Add MFD core enables chip access for ADC driver for battery readings,
and a power supply battery-charger driver
Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Add device tree binding information for mp2629 mfd driver.
Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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This add support for the MediaTek MT6358 RTC. Driver using
compatible data to store different RTC_WRTGR address offset.
This replace RTC_WRTGR to RTC_WRTGR_MT6323 in mt6323-poweroff
driver which only needed by armv7 CPU without ATF.
Signed-off-by: Ran Bi <ran.bi@mediatek.com>
Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@mediatek.com>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Sebastian Reichel <sre@kernel.org>
Reviewed-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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This adds support for the MediaTek MT6358 PMIC. This is a
multifunction device with the following sub modules:
- Regulator
- RTC
- Codec
- Interrupt
It is interfaced to the host controller using SPI interface
by a proprietary hardware called PMIC wrapper or pwrap.
MT6358 MFD is a child device of the pwrap.
Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@mediatek.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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This adds compatible for the MediaTek MT6358 PMIC.
Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@mediatek.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Add new struct members for mfd-cells and irq initial function, so we can
call devm_mfd_add_devices() only once.
Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@mediatek.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Some pmics don't need backup interrupt settings, so we change to use
pm notifier for the pmics which are necessary to store settings.
Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@mediatek.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Pull smack updates from Casey Schaufler:
"Clean out dead code and repair an out-of-bounds warning"
* tag 'Smack-for-5.8' of git://github.com/cschaufler/smack-next:
Smack: Remove unused inline function smk_ad_setfield_u_fs_path_mnt
Smack:- Remove redundant inode_smack cache
Smack:- Remove mutex lock "smk_lock" from inode_smack
Smack: slab-out-of-bounds in vsscanf
smack: remove redundant structure variable from header.
smack: avoid unused 'sip' variable warning
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commit a269434d2fb4 ("LSM: separate LSM_AUDIT_DATA_DENTRY from LSM_AUDIT_DATA_PATH")
left behind this, remove it.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
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The inode_smack cache is no longer used.
Remove it.
Signed-off-by: Vishal Goel <vishal.goel@samsung.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
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"smk_lock" mutex is used during inode instantiation in
smack_d_instantiate()function. It has been used to avoid
simultaneous access on same inode security structure.
Since smack related initialization is done only once i.e during
inode creation. If the inode has already been instantiated then
smack_d_instantiate() function just returns without doing
anything.
So it means mutex lock is required only during inode creation.
But since 2 processes can't create same inodes or files
simultaneously. Also linking or some other file operation can't
be done simultaneously when the file is getting created since
file lookup will fail before dentry inode linkup which is done
after smack initialization.
So no mutex lock is required in inode_smack structure.
It will save memory as well as improve some performance.
If 40000 inodes are created in system, it will save 1.5 MB on
32-bit systems & 2.8 MB on 64-bit systems.
Signed-off-by: Vishal Goel <vishal.goel@samsung.com>
Signed-off-by: Amit Sahrawat <a.sahrawat@samsung.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
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Add barrier to soob. Return -EOVERFLOW if the buffer
is exceeded.
Suggested-by: Hillf Danton <hdanton@sina.com>
Reported-by: syzbot+bfdd4a2f07be52351350@syzkaller.appspotmail.com
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
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commit afb1cbe37440 ("LSM: Infrastructure management
of the inode security") removed usage of smk_rcu,
thus removing it from structure.
Signed-off-by: Maninder Singh <maninder1.s@samsung.com>
Signed-off-by: Vaneet Narang <v.narang@samsung.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
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The mix of IS_ENABLED() and #ifdef checks has left a combination
that causes a warning about an unused variable:
security/smack/smack_lsm.c: In function 'smack_socket_connect':
security/smack/smack_lsm.c:2838:24: error: unused variable 'sip' [-Werror=unused-variable]
2838 | struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap;
Change the code to use C-style checks consistently so the compiler
can handle it correctly.
Fixes: 87fbfffcc89b ("broken ping to ipv6 linklocal addresses on debian buster")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
Pull keyring updates from David Howells:
- Fix a documentation warning.
- Replace a zero-length array with a flexible one
- Make the big_key key type use ChaCha20Poly1305 and use the crypto
algorithm directly rather than going through the crypto layer.
- Implement the update op for the big_key type.
* tag 'keys-next-20200602' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
keys: Implement update for the big_key type
security/keys: rewrite big_key crypto to use library interface
KEYS: Replace zero-length array with flexible-array
Documentation: security: core.rst: add missing argument
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Implement the ->update op for the big_key type.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Jason A. Donenfeld <Jason@zx2c4.com>
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A while back, I noticed that the crypto and crypto API usage in big_keys
were entirely broken in multiple ways, so I rewrote it. Now, I'm
rewriting it again, but this time using the simpler ChaCha20Poly1305
library function. This makes the file considerably more simple; the
diffstat alone should justify this commit. It also should be faster,
since it no longer requires a mutex around the "aead api object" (nor
allocations), allowing us to encrypt multiple items in parallel. We also
benefit from being able to pass any type of pointer, so we can get rid
of the ridiculously complex custom page allocator that big_key really
doesn't need.
[DH: Change the select CRYPTO_LIB_CHACHA20POLY1305 to a depends on as
select doesn't propagate and the build can end up with an =y dependending
on some =m pieces.
The depends on CRYPTO also had to be removed otherwise the configurator
complains about a recursive dependency.]
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: kernel-hardening@lists.openwall.com
Reviewed-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: David Howells <dhowells@redhat.com>
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The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by
this change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
sizeof(flexible-array-member) triggers a warning because flexible array
members have incomplete type[1]. There are some instances of code in
which the sizeof operator is being incorrectly/erroneously applied to
zero-length arrays and the result is zero. Such instances may be hiding
some bugs. So, this work (flexible-array member conversions) will also
help to get completely rid of those sorts of issues.
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
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