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Ira Weiny 3108f7c788 PCI: Allow drivers to request exclusive config regions 
[ Upstream commit 278294798a ]

PCI config space access from user space has traditionally been
unrestricted with writes being an understood risk for device operation.

Unfortunately, device breakage or odd behavior from config writes lacks
indicators that can leave driver writers confused when evaluating
failures.  This is especially true with the new PCIe Data Object
Exchange (DOE) mailbox protocol where backdoor shenanigans from user
space through things such as vendor defined protocols may affect device
operation without complete breakage.

A prior proposal restricted read and writes completely.[1]  Greg and
Bjorn pointed out that proposal is flawed for a couple of reasons.
First, lspci should always be allowed and should not interfere with any
device operation.  Second, setpci is a valuable tool that is sometimes
necessary and it should not be completely restricted.[2]  Finally
methods exist for full lock of device access if required.

Even though access should not be restricted it would be nice for driver
writers to be able to flag critical parts of the config space such that
interference from user space can be detected.

Introduce pci_request_config_region_exclusive() to mark exclusive config
regions.  Such regions trigger a warning and kernel taint if accessed
via user space.

Create pci_warn_once() to restrict the user from spamming the log.

[1] https://lore.kernel.org/all/161663543465.1867664.5674061943008380442.stgit@dwillia2-desk3.amr.corp.intel.com/
[2] https://lore.kernel.org/all/YF8NGeGv9vYcMfTV@kroah.com/

Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Suggested-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20220926215711.2893286-2-ira.weiny@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Stable-dep-of: 5e70d0acf0 ("PCI: Add locking to RMW PCI Express Capability Register accessors")
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2023-09-13 09:42:46 +02:00
..
accessibility
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acpi ACPI: x86: s2idle: Fix a logic error parsing AMD constraints table 2023-09-13 09:42:29 +02:00
amba
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android binder: fix memory leak in binder_init() 2023-08-16 18:27:24 +02:00
ata ata: pata_arasan_cf: Use dev_err_probe() instead dev_err() in data_xfer() 2023-09-13 09:42:23 +02:00
atm
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auxdisplay
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base regmap: rbtree: Use alloc_flags for memory allocations 2023-09-13 09:42:31 +02:00
bcma
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block ublk: remove check IO_URING_F_SQE128 in ublk_ch_uring_cmd 2023-08-30 16:11:11 +02:00
bluetooth Bluetooth: btusb: Do not call kfree_skb() under spin_lock_irqsave() 2023-09-13 09:42:34 +02:00
bus bus: ti-sysc: Fix cast to enum warning 2023-09-13 09:42:43 +02:00
cdrom
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char ipmi:ssif: Fix a memory leak when scanning for an adapter 2023-09-13 09:42:44 +02:00
clk clk: qcom: gcc-sm6350: Fix gcc_sdcc2_apps_clk_src 2023-09-13 09:42:46 +02:00
clocksource clocksource/drivers/cadence-ttc: Fix memory leak in ttc_timer_probe 2023-07-19 16:20:59 +02:00
comedi
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connector
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counter counter: 104-quad-8: Fix Synapse action reported for Index signals 2023-04-13 16:55:31 +02:00
cpufreq cpufreq: powernow-k8: Use related_cpus instead of cpus in driver.exit() 2023-09-13 09:42:30 +02:00
cpuidle cpuidle: psci: Move enabling OSI mode after power domains creation 2023-08-23 17:52:17 +02:00
crypto crypto: caam - fix unchecked return value error 2023-09-13 09:42:33 +02:00
cxl cxl/acpi: Return 'rc' instead of '0' in cxl_parse_cfmws() 2023-08-03 10:24:04 +02:00
dax dax/kmem: Pass valid argument to memory_group_register_static 2023-07-19 16:21:43 +02:00
dca
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devfreq
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dio
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dma idmaengine: make FSL_EDMA and INTEL_IDMA64 depends on HAS_IOMEM 2023-09-13 09:42:24 +02:00
dma-buf dma-buf/sw_sync: Avoid recursive lock during fence signal 2023-08-30 16:11:12 +02:00
edac EDAC/igen6: Fix the issue of no error events 2023-09-13 09:42:45 +02:00
eisa
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extcon extcon: usbc-tusb320: Unregister typec port on driver removal 2023-07-19 16:22:08 +02:00
firewire firewire: net: fix use after free in fwnet_finish_incoming_packet() 2023-08-23 17:52:24 +02:00
firmware firmware: cs_dsp: Fix new control name check 2023-09-13 09:42:44 +02:00
fpga fpga: bridge: fix kernel-doc parameter description 2023-05-11 23:03:27 +09:00
fsi fsi: master-ast-cf: Add MODULE_FIRMWARE macro 2023-09-06 21:27:02 +01:00
gnss
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gpio gpio: sim: pass the GPIO device's software node to irq domain 2023-08-30 16:11:13 +02:00
gpu drm/mediatek: Fix potential memory leak if vmap() fail 2023-09-13 09:42:43 +02:00
greybus
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hid HID: wacom: remove the battery when the EKR is off 2023-09-06 21:27:01 +01:00
hsi
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hte hte: tegra-194: Fix off by one in tegra_hte_map_to_line_id() 2023-05-11 23:03:38 +09:00
hv Drivers: hv: vmbus: Fix vmbus_wait_for_unload() to scan present CPUs 2023-06-28 11:12:23 +02:00
hwmon hwmon: (tmp513) Fix the channel number in tmp51x_is_visible() 2023-09-13 09:42:35 +02:00
hwspinlock
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hwtracing hwtracing: hisi_ptt: Fix potential sleep in atomic context 2023-07-19 16:21:58 +02:00
i2c i2c: designware: Handle invalid SMBus block data response length value 2023-08-23 17:52:31 +02:00
i3c i3c: master: svc: fix cpu schedule in spin lock 2023-07-19 16:21:54 +02:00
idle Revert "cpuidle, intel_idle: Fix CPUIDLE_FLAG_IRQ_ENABLE *again*" 2023-04-06 12:10:58 +02:00
iio iio: core: Prevent invalid memory access when there is no parent 2023-08-16 18:27:25 +02:00
infiniband RDMA/mlx5: Return the firmware result upon destroying QP/RQ 2023-08-23 17:52:21 +02:00
input Input: i8042 - add quirk for TUXEDO Gemini 17 Gen1/Clevo PD70PN 2023-09-13 09:42:26 +02:00
interconnect interconnect: qcom: sm8450: add enable_mask for bcm nodes 2023-08-16 18:27:25 +02:00
iommu iommu/amd: Introduce Disable IRTE Caching Support 2023-08-23 17:52:21 +02:00
ipack
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irqchip irqchip/loongson-eiointc: Fix return value checking of eiointc_index 2023-09-13 09:42:29 +02:00
isdn mISDN: Update parameter type of dsp_cmx_send() 2023-08-16 18:27:26 +02:00
leds led: qcom-lpg: Fix resource leaks in for_each_available_child_of_node() loops 2023-08-23 17:52:23 +02:00
macintosh macintosh: via-pmu-led: requires ATA to be set 2023-05-11 23:03:31 +09:00
mailbox mailbox: ti-msgmgr: Fill non-message tx data fields with 0x0 2023-07-19 16:22:03 +02:00
mcb mcb-pci: Reallocate memory region to avoid memory overlapping 2023-05-24 17:32:41 +01:00
md md: raid0: account for split bio in iostat accounting 2023-09-13 09:42:44 +02:00
media media: pci: cx23885: fix error handling for cx23885 ATSC boards 2023-09-13 09:42:21 +02:00
memory memory: brcmstb_dpfe: fix testing array offset after use 2023-07-19 16:21:24 +02:00
memstick memstick r592: make memstick_debug_get_tpc_name() static 2023-07-19 16:21:08 +02:00
message scsi: message: mptlan: Fix use after free bug in mptlan_remove() due to race condition 2023-05-24 17:32:37 +01:00
mfd mfd: pm8008: Fix module autoloading 2023-07-23 13:49:37 +02:00
misc accel/habanalabs: add pci health check during heartbeat 2023-08-23 17:52:21 +02:00
mmc mmc: au1xmmc: force non-modular build and remove symbol_get usage 2023-09-06 21:26:59 +01:00
most
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mtd mtd: rawnand: fsl_upm: Fix an off-by one test in fun_exec_op() 2023-08-11 12:08:25 +02:00
mux
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net sfc: Check firmware supports Ethernet PTP filter 2023-09-13 09:42:35 +02:00
nfc nfcsim.c: Fix error checking for debugfs_create_dir 2023-06-28 11:12:36 +02:00
ntb NTB: ntb_tool: Add check for devm_kcalloc 2023-07-23 13:49:24 +02:00
nubus nubus: Partially revert proc_create_single_data() conversion 2023-07-05 18:27:37 +01:00
nvdimm
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nvme nvme-rdma: fix potential unbalanced freeze & unfreeze 2023-08-16 18:27:30 +02:00
nvmem nvmem: rmem: Use NVMEM_DEVID_AUTO 2023-07-19 16:21:57 +02:00
of of: unittest: Fix overlay type in apply/revert check 2023-09-13 09:42:44 +02:00
opp OPP: Fix passing 0 to PTR_ERR in _opp_attach_genpd() 2023-09-13 09:42:28 +02:00
parisc parisc: Replace regular spinlock with spin_trylock on panic path 2023-05-24 17:32:42 +01:00
parport
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pci PCI: Allow drivers to request exclusive config regions 2023-09-13 09:42:46 +02:00
pcmcia pcmcia: rsrc_nonstatic: Fix memory leak in nonstatic_release_resource_db() 2023-08-23 17:52:24 +02:00
peci
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perf perf/imx_ddr: don't enable counter0 if none of 4 counters are used 2023-09-13 09:42:29 +02:00
phy phy: qcom-snps-femto-v2: use qcom_snps_hsphy_suspend/resume error code 2023-09-13 09:42:20 +02:00
pinctrl pinctrl: mcp23s08: check return value of devm_kasprintf() 2023-09-13 09:42:46 +02:00
platform platform/mellanox: Fix mlxbf-tmfifo not handling all virtio CONSOLE notifications 2023-09-13 09:42:25 +02:00
pnp
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power power: supply: Fix logic checking if system is running from battery 2023-06-21 16:00:52 +02:00
powercap powercap: RAPL: Fix CONFIG_IOSF_MBI dependency 2023-07-19 16:21:00 +02:00
pps
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ps3
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ptp ptp_qoriq: fix memory leak in probe() 2023-04-06 12:10:44 +02:00
pwm pwm: meson: fix handling of period/duty if greater than UINT_MAX 2023-07-23 13:49:46 +02:00
rapidio
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ras
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regulator regulator: tps65219: Fix matching interrupts for their regulators 2023-07-19 16:22:14 +02:00
remoteproc remoteproc: imx_dsp_rproc: Fix kernel test robot sparse warning 2023-05-24 17:32:53 +01:00
reset
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rpmsg rpmsg: glink: Propagate TX failures in intentless mode as well 2023-05-11 23:03:16 +09:00
rtc rtc: ds1685: use EXPORT_SYMBOL_GPL for ds1685_rtc_poweroff 2023-09-06 21:27:00 +01:00
s390 s390/pkey: fix PKEY_TYPE_EP11_AES handling for sysfs attributes 2023-09-13 09:42:29 +02:00
sbus
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scsi scsi: lpfc: Fix incorrect big endian type assignment in bsg loopback path 2023-09-13 09:42:25 +02:00
sh
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siox
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slimbus
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soc soc: qcom: smem: Fix incompatible types in comparison 2023-09-13 09:42:42 +02:00
soundwire soundwire: fix enumeration completion 2023-08-03 10:24:15 +02:00
spi spi: tegra20-sflash: fix to check return value of platform_get_irq() in tegra_sflash_probe() 2023-09-13 09:42:31 +02:00
spmi spmi: Add a check for remove callback when removing a SPMI driver 2023-05-11 23:03:31 +09:00
ssb
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staging staging: fbtft: ili9341: use macro FBTFT_REGISTER_SPI_DRIVER 2023-09-13 09:42:23 +02:00
target scsi: target: iscsi: Prevent login threads from racing between each other 2023-06-28 11:12:35 +02:00
tc
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tee tee: amdtee: Add return_origin to 'struct tee_cmd_load_ta' 2023-06-14 11:15:28 +02:00
thermal thermal/of: Fix potential uninitialized value access 2023-09-13 09:42:29 +02:00
thunderbolt thunderbolt: Fix a backport error for display flickering issue 2023-09-02 09:16:20 +02:00
tty serial: sc16is7xx: fix bug when first setting GPIO direction 2023-09-06 21:27:02 +01:00
ufs scsi: ufs: Try harder to change the power mode 2023-09-13 09:42:20 +02:00
uio
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usb usb: typec: tcpci: clear the fault status bit 2023-09-06 21:27:03 +01:00
vdpa vdpa: Enable strict validation for netlinks ops 2023-08-23 17:52:31 +02:00
vfio vfio/mdev: Move the compat_class initialization to module init 2023-07-19 16:21:41 +02:00
vhost vhost_net: revert upend_idx only on retriable error 2023-06-28 11:12:40 +02:00
video video/aperture: Move vga handling to pci function 2023-08-30 16:10:58 +02:00
virt virt: sevguest: Add CONFIG_CRYPTO dependency 2023-07-19 16:20:55 +02:00
virtio virtio-mmio: don't break lifecycle of vm_dev 2023-08-23 17:52:29 +02:00
vlynq
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w1 w1: fix loop in w1_fini() 2023-07-19 16:21:48 +02:00
watchdog watchdog: sp5100_tco: support Hygon FCH/SCH (Server Controller Hub) 2023-08-23 17:52:25 +02:00
xen xen: speed up grant-table reclaim 2023-08-03 10:24:14 +02:00
zorro
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Kconfig
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Makefile
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